pull-requests: moved get_pr_version into PullRequestModel.

rhodecode/apps/repository/views/repo_pull_requests.py

@@ -1,1259 +1,1236 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2011-2017 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 import logging
 import collections
 
 import formencode
 import formencode.htmlfill
 import peppercorn
 from pyramid.httpexceptions import (
     HTTPFound, HTTPNotFound, HTTPForbidden, HTTPBadRequest)
 from pyramid.view import view_config
 from pyramid.renderers import render
 
 from rhodecode import events
 from rhodecode.apps._base import RepoAppView, DataGridAppView
 
 from rhodecode.lib import helpers as h, diffs, codeblocks, channelstream
 from rhodecode.lib.base import vcs_operation_context
 from rhodecode.lib.ext_json import json
 from rhodecode.lib.auth import (
     LoginRequired, HasRepoPermissionAny, HasRepoPermissionAnyDecorator,
     NotAnonymous, CSRFRequired)
 from rhodecode.lib.utils2 import str2bool, safe_str, safe_unicode
 from rhodecode.lib.vcs.backends.base import EmptyCommit, UpdateFailureReason
 from rhodecode.lib.vcs.exceptions import (CommitDoesNotExistError,
     RepositoryRequirementError, NodeDoesNotExistError, EmptyRepositoryError)
 from rhodecode.model.changeset_status import ChangesetStatusModel
 from rhodecode.model.comment import CommentsModel
 from rhodecode.model.db import (func, or_, PullRequest, PullRequestVersion,
     ChangesetComment, ChangesetStatus, Repository)
 from rhodecode.model.forms import PullRequestForm
 from rhodecode.model.meta import Session
 from rhodecode.model.pull_request import PullRequestModel, MergeCheck
 from rhodecode.model.scm import ScmModel
 
 log = logging.getLogger(__name__)
 
 
 class RepoPullRequestsView(RepoAppView, DataGridAppView):
 
     def load_default_context(self):
         c = self._get_local_tmpl_context(include_app_defaults=True)
         c.REVIEW_STATUS_APPROVED = ChangesetStatus.STATUS_APPROVED
         c.REVIEW_STATUS_REJECTED = ChangesetStatus.STATUS_REJECTED
 
         return c
 
     def _get_pull_requests_list(
             self, repo_name, source, filter_type, opened_by, statuses):
 
         draw, start, limit = self._extract_chunk(self.request)
         search_q, order_by, order_dir = self._extract_ordering(self.request)
         _render = self.request.get_partial_renderer(
             'rhodecode:templates/data_table/_dt_elements.mako')
 
         # pagination
 
         if filter_type == 'awaiting_review':
             pull_requests = PullRequestModel().get_awaiting_review(
                 repo_name, source=source, opened_by=opened_by,
                 statuses=statuses, offset=start, length=limit,
                 order_by=order_by, order_dir=order_dir)
             pull_requests_total_count = PullRequestModel().count_awaiting_review(
                 repo_name, source=source, statuses=statuses,
                 opened_by=opened_by)
         elif filter_type == 'awaiting_my_review':
             pull_requests = PullRequestModel().get_awaiting_my_review(
                 repo_name, source=source, opened_by=opened_by,
                 user_id=self._rhodecode_user.user_id, statuses=statuses,
                 offset=start, length=limit, order_by=order_by,
                 order_dir=order_dir)
             pull_requests_total_count = PullRequestModel().count_awaiting_my_review(
                 repo_name, source=source, user_id=self._rhodecode_user.user_id,
                 statuses=statuses, opened_by=opened_by)
         else:
             pull_requests = PullRequestModel().get_all(
                 repo_name, source=source, opened_by=opened_by,
                 statuses=statuses, offset=start, length=limit,
                 order_by=order_by, order_dir=order_dir)
             pull_requests_total_count = PullRequestModel().count_all(
                 repo_name, source=source, statuses=statuses,
                 opened_by=opened_by)
 
         data = []
         comments_model = CommentsModel()
         for pr in pull_requests:
             comments = comments_model.get_all_comments(
                 self.db_repo.repo_id, pull_request=pr)
 
             data.append({
                 'name': _render('pullrequest_name',
                                 pr.pull_request_id, pr.target_repo.repo_name),
                 'name_raw': pr.pull_request_id,
                 'status': _render('pullrequest_status',
                                   pr.calculated_review_status()),
                 'title': _render(
                     'pullrequest_title', pr.title, pr.description),
                 'description': h.escape(pr.description),
                 'updated_on': _render('pullrequest_updated_on',
                                       h.datetime_to_time(pr.updated_on)),
                 'updated_on_raw': h.datetime_to_time(pr.updated_on),
                 'created_on': _render('pullrequest_updated_on',
                                       h.datetime_to_time(pr.created_on)),
                 'created_on_raw': h.datetime_to_time(pr.created_on),
                 'author': _render('pullrequest_author',
                                   pr.author.full_contact, ),
                 'author_raw': pr.author.full_name,
                 'comments': _render('pullrequest_comments', len(comments)),
                 'comments_raw': len(comments),
                 'closed': pr.is_closed(),
             })
 
         data = ({
             'draw': draw,
             'data': data,
             'recordsTotal': pull_requests_total_count,
             'recordsFiltered': pull_requests_total_count,
         })
         return data
 
     @LoginRequired()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @view_config(
         route_name='pullrequest_show_all', request_method='GET',
         renderer='rhodecode:templates/pullrequests/pullrequests.mako')
     def pull_request_list(self):
         c = self.load_default_context()
 
         req_get = self.request.GET
         c.source = str2bool(req_get.get('source'))
         c.closed = str2bool(req_get.get('closed'))
         c.my = str2bool(req_get.get('my'))
         c.awaiting_review = str2bool(req_get.get('awaiting_review'))
         c.awaiting_my_review = str2bool(req_get.get('awaiting_my_review'))
 
         c.active = 'open'
         if c.my:
             c.active = 'my'
         if c.closed:
             c.active = 'closed'
         if c.awaiting_review and not c.source:
             c.active = 'awaiting'
         if c.source and not c.awaiting_review:
             c.active = 'source'
         if c.awaiting_my_review:
             c.active = 'awaiting_my'
 
         return self._get_template_context(c)
 
     @LoginRequired()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @view_config(
         route_name='pullrequest_show_all_data', request_method='GET',
         renderer='json_ext', xhr=True)
     def pull_request_list_data(self):
         self.load_default_context()
 
         # additional filters
         req_get = self.request.GET
         source = str2bool(req_get.get('source'))
         closed = str2bool(req_get.get('closed'))
         my = str2bool(req_get.get('my'))
         awaiting_review = str2bool(req_get.get('awaiting_review'))
         awaiting_my_review = str2bool(req_get.get('awaiting_my_review'))
 
         filter_type = 'awaiting_review' if awaiting_review \
             else 'awaiting_my_review' if awaiting_my_review \
             else None
 
         opened_by = None
         if my:
             opened_by = [self._rhodecode_user.user_id]
 
         statuses = [PullRequest.STATUS_NEW, PullRequest.STATUS_OPEN]
         if closed:
             statuses = [PullRequest.STATUS_CLOSED]
 
         data = self._get_pull_requests_list(
             repo_name=self.db_repo_name, source=source,
             filter_type=filter_type, opened_by=opened_by, statuses=statuses)
 
         return data
 
-    def _get_pr_version(self, pull_request_id, version=None):
-        at_version = None
-
-        if version and version == 'latest':
-            pull_request_ver = PullRequest.get(pull_request_id)
-            pull_request_obj = pull_request_ver
-            _org_pull_request_obj = pull_request_obj
-            at_version = 'latest'
-        elif version:
-            pull_request_ver = PullRequestVersion.get_or_404(version)
-            pull_request_obj = pull_request_ver
-            _org_pull_request_obj = pull_request_ver.pull_request
-            at_version = pull_request_ver.pull_request_version_id
-        else:
-            _org_pull_request_obj = pull_request_obj = PullRequest.get_or_404(
-                pull_request_id)
-
-        pull_request_display_obj = PullRequest.get_pr_display_object(
-            pull_request_obj, _org_pull_request_obj)
-
-        return _org_pull_request_obj, pull_request_obj, \
-               pull_request_display_obj, at_version
-
     def _get_diffset(self, source_repo_name, source_repo,
                      source_ref_id, target_ref_id,
                      target_commit, source_commit, diff_limit, fulldiff,
                      file_limit, display_inline_comments):
 
         vcs_diff = PullRequestModel().get_diff(
             source_repo, source_ref_id, target_ref_id)
 
         diff_processor = diffs.DiffProcessor(
             vcs_diff, format='newdiff', diff_limit=diff_limit,
             file_limit=file_limit, show_full_diff=fulldiff)
 
         _parsed = diff_processor.prepare()
 
         def _node_getter(commit):
             def get_node(fname):
                 try:
                     return commit.get_node(fname)
                 except NodeDoesNotExistError:
                     return None
 
             return get_node
 
         diffset = codeblocks.DiffSet(
             repo_name=self.db_repo_name,
             source_repo_name=source_repo_name,
             source_node_getter=_node_getter(target_commit),
             target_node_getter=_node_getter(source_commit),
             comments=display_inline_comments
         )
         diffset = diffset.render_patchset(
             _parsed, target_commit.raw_id, source_commit.raw_id)
 
         return diffset
 
     @LoginRequired()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @view_config(
         route_name='pullrequest_show', request_method='GET',
         renderer='rhodecode:templates/pullrequests/pullrequest_show.mako')
     def pull_request_show(self):
         pull_request_id = self.request.matchdict['pull_request_id']
 
         c = self.load_default_context()
 
         version = self.request.GET.get('version')
         from_version = self.request.GET.get('from_version') or version
         merge_checks = self.request.GET.get('merge_checks')
         c.fulldiff = str2bool(self.request.GET.get('fulldiff'))
 
         (pull_request_latest,
          pull_request_at_ver,
          pull_request_display_obj,
-         at_version) = self._get_pr_version(
+         at_version) = PullRequestModel().get_pr_version(
             pull_request_id, version=version)
         pr_closed = pull_request_latest.is_closed()
 
         if pr_closed and (version or from_version):
             # not allow to browse versions
             raise HTTPFound(h.route_path(
                 'pullrequest_show', repo_name=self.db_repo_name,
                 pull_request_id=pull_request_id))
 
         versions = pull_request_display_obj.versions()
 
         c.at_version = at_version
         c.at_version_num = (at_version
                             if at_version and at_version != 'latest'
                             else None)
         c.at_version_pos = ChangesetComment.get_index_from_version(
             c.at_version_num, versions)
 
         (prev_pull_request_latest,
          prev_pull_request_at_ver,
          prev_pull_request_display_obj,
-         prev_at_version) = self._get_pr_version(
+         prev_at_version) = PullRequestModel().get_pr_version(
             pull_request_id, version=from_version)
 
         c.from_version = prev_at_version
         c.from_version_num = (prev_at_version
                               if prev_at_version and prev_at_version != 'latest'
                               else None)
         c.from_version_pos = ChangesetComment.get_index_from_version(
             c.from_version_num, versions)
 
         # define if we're in COMPARE mode or VIEW at version mode
         compare = at_version != prev_at_version
 
         # pull_requests repo_name we opened it against
         # ie. target_repo must match
         if self.db_repo_name != pull_request_at_ver.target_repo.repo_name:
             raise HTTPNotFound()
 
         c.shadow_clone_url = PullRequestModel().get_shadow_clone_url(
             pull_request_at_ver)
 
         c.pull_request = pull_request_display_obj
         c.pull_request_latest = pull_request_latest
 
         if compare or (at_version and not at_version == 'latest'):
             c.allowed_to_change_status = False
             c.allowed_to_update = False
             c.allowed_to_merge = False
             c.allowed_to_delete = False
             c.allowed_to_comment = False
             c.allowed_to_close = False
         else:
             can_change_status = PullRequestModel().check_user_change_status(
                 pull_request_at_ver, self._rhodecode_user)
             c.allowed_to_change_status = can_change_status and not pr_closed
 
             c.allowed_to_update = PullRequestModel().check_user_update(
                 pull_request_latest, self._rhodecode_user) and not pr_closed
             c.allowed_to_merge = PullRequestModel().check_user_merge(
                 pull_request_latest, self._rhodecode_user) and not pr_closed
             c.allowed_to_delete = PullRequestModel().check_user_delete(
                 pull_request_latest, self._rhodecode_user) and not pr_closed
             c.allowed_to_comment = not pr_closed
             c.allowed_to_close = c.allowed_to_merge and not pr_closed
 
         c.forbid_adding_reviewers = False
         c.forbid_author_to_review = False
         c.forbid_commit_author_to_review = False
 
         if pull_request_latest.reviewer_data and \
                         'rules' in pull_request_latest.reviewer_data:
             rules = pull_request_latest.reviewer_data['rules'] or {}
             try:
                 c.forbid_adding_reviewers = rules.get(
                     'forbid_adding_reviewers')
                 c.forbid_author_to_review = rules.get(
                     'forbid_author_to_review')
                 c.forbid_commit_author_to_review = rules.get(
                     'forbid_commit_author_to_review')
             except Exception:
                 pass
 
         # check merge capabilities
         _merge_check = MergeCheck.validate(
             pull_request_latest, user=self._rhodecode_user,
             translator=self.request.translate)
         c.pr_merge_errors = _merge_check.error_details
         c.pr_merge_possible = not _merge_check.failed
         c.pr_merge_message = _merge_check.merge_msg
 
         c.pr_merge_info = MergeCheck.get_merge_conditions(
             pull_request_latest, translator=self.request.translate)
 
         c.pull_request_review_status = _merge_check.review_status
         if merge_checks:
             self.request.override_renderer = \
                 'rhodecode:templates/pullrequests/pullrequest_merge_checks.mako'
             return self._get_template_context(c)
 
         comments_model = CommentsModel()
 
         # reviewers and statuses
         c.pull_request_reviewers = pull_request_at_ver.reviewers_statuses()
         allowed_reviewers = [x[0].user_id for x in c.pull_request_reviewers]
 
         # GENERAL COMMENTS with versions #
         q = comments_model._all_general_comments_of_pull_request(pull_request_latest)
         q = q.order_by(ChangesetComment.comment_id.asc())
         general_comments = q
 
         # pick comments we want to render at current version
         c.comment_versions = comments_model.aggregate_comments(
             general_comments, versions, c.at_version_num)
         c.comments = c.comment_versions[c.at_version_num]['until']
 
         # INLINE COMMENTS with versions  #
         q = comments_model._all_inline_comments_of_pull_request(pull_request_latest)
         q = q.order_by(ChangesetComment.comment_id.asc())
         inline_comments = q
 
         c.inline_versions = comments_model.aggregate_comments(
             inline_comments, versions, c.at_version_num, inline=True)
 
         # inject latest version
         latest_ver = PullRequest.get_pr_display_object(
             pull_request_latest, pull_request_latest)
 
         c.versions = versions + [latest_ver]
 
         # if we use version, then do not show later comments
         # than current version
         display_inline_comments = collections.defaultdict(
             lambda: collections.defaultdict(list))
         for co in inline_comments:
             if c.at_version_num:
                 # pick comments that are at least UPTO given version, so we
                 # don't render comments for higher version
                 should_render = co.pull_request_version_id and \
                                 co.pull_request_version_id <= c.at_version_num
             else:
                 # showing all, for 'latest'
                 should_render = True
 
             if should_render:
                 display_inline_comments[co.f_path][co.line_no].append(co)
 
         # load diff data into template context, if we use compare mode then
         # diff is calculated based on changes between versions of PR
 
         source_repo = pull_request_at_ver.source_repo
         source_ref_id = pull_request_at_ver.source_ref_parts.commit_id
 
         target_repo = pull_request_at_ver.target_repo
         target_ref_id = pull_request_at_ver.target_ref_parts.commit_id
 
         if compare:
             # in compare switch the diff base to latest commit from prev version
             target_ref_id = prev_pull_request_display_obj.revisions[0]
 
         # despite opening commits for bookmarks/branches/tags, we always
         # convert this to rev to prevent changes after bookmark or branch change
         c.source_ref_type = 'rev'
         c.source_ref = source_ref_id
 
         c.target_ref_type = 'rev'
         c.target_ref = target_ref_id
 
         c.source_repo = source_repo
         c.target_repo = target_repo
 
         c.commit_ranges = []
         source_commit = EmptyCommit()
         target_commit = EmptyCommit()
         c.missing_requirements = False
 
         source_scm = source_repo.scm_instance()
         target_scm = target_repo.scm_instance()
 
         # try first shadow repo, fallback to regular repo
         try:
             commits_source_repo = pull_request_latest.get_shadow_repo()
         except Exception:
             log.debug('Failed to get shadow repo', exc_info=True)
             commits_source_repo = source_scm
 
         c.commits_source_repo = commits_source_repo
         commit_cache = {}
         try:
             pre_load = ["author", "branch", "date", "message"]
             show_revs = pull_request_at_ver.revisions
             for rev in show_revs:
                 comm = commits_source_repo.get_commit(
                     commit_id=rev, pre_load=pre_load)
                 c.commit_ranges.append(comm)
                 commit_cache[comm.raw_id] = comm
 
             # Order here matters, we first need to get target, and then
             # the source
             target_commit = commits_source_repo.get_commit(
                 commit_id=safe_str(target_ref_id))
 
             source_commit = commits_source_repo.get_commit(
                 commit_id=safe_str(source_ref_id))
 
         except CommitDoesNotExistError:
             log.warning(
                 'Failed to get commit from `{}` repo'.format(
                     commits_source_repo), exc_info=True)
         except RepositoryRequirementError:
             log.warning(
                 'Failed to get all required data from repo', exc_info=True)
             c.missing_requirements = True
 
         c.ancestor = None  # set it to None, to hide it from PR view
 
         try:
             ancestor_id = source_scm.get_common_ancestor(
                 source_commit.raw_id, target_commit.raw_id, target_scm)
             c.ancestor_commit = source_scm.get_commit(ancestor_id)
         except Exception:
             c.ancestor_commit = None
 
         c.statuses = source_repo.statuses(
             [x.raw_id for x in c.commit_ranges])
 
         # auto collapse if we have more than limit
         collapse_limit = diffs.DiffProcessor._collapse_commits_over
         c.collapse_all_commits = len(c.commit_ranges) > collapse_limit
         c.compare_mode = compare
 
         # diff_limit is the old behavior, will cut off the whole diff
         # if the limit is applied  otherwise will just hide the
         # big files from the front-end
         diff_limit = c.visual.cut_off_limit_diff
         file_limit = c.visual.cut_off_limit_file
 
         c.missing_commits = False
         if (c.missing_requirements
             or isinstance(source_commit, EmptyCommit)
             or source_commit == target_commit):
 
             c.missing_commits = True
         else:
 
             c.diffset = self._get_diffset(
                 c.source_repo.repo_name, commits_source_repo,
                 source_ref_id, target_ref_id,
                 target_commit, source_commit,
                 diff_limit, c.fulldiff, file_limit, display_inline_comments)
 
             c.limited_diff = c.diffset.limited_diff
 
             # calculate removed files that are bound to comments
             comment_deleted_files = [
                 fname for fname in display_inline_comments
                 if fname not in c.diffset.file_stats]
 
             c.deleted_files_comments = collections.defaultdict(dict)
             for fname, per_line_comments in display_inline_comments.items():
                 if fname in comment_deleted_files:
                     c.deleted_files_comments[fname]['stats'] = 0
                     c.deleted_files_comments[fname]['comments'] = list()
                     for lno, comments in per_line_comments.items():
                         c.deleted_files_comments[fname]['comments'].extend(
                             comments)
 
         # this is a hack to properly display links, when creating PR, the
         # compare view and others uses different notation, and
         # compare_commits.mako renders links based on the target_repo.
         # We need to swap that here to generate it properly on the html side
         c.target_repo = c.source_repo
 
         c.commit_statuses = ChangesetStatus.STATUSES
 
         c.show_version_changes = not pr_closed
         if c.show_version_changes:
             cur_obj = pull_request_at_ver
             prev_obj = prev_pull_request_at_ver
 
             old_commit_ids = prev_obj.revisions
             new_commit_ids = cur_obj.revisions
             commit_changes = PullRequestModel()._calculate_commit_id_changes(
                 old_commit_ids, new_commit_ids)
             c.commit_changes_summary = commit_changes
 
             # calculate the diff for commits between versions
             c.commit_changes = []
             mark = lambda cs, fw: list(
                 h.itertools.izip_longest([], cs, fillvalue=fw))
             for c_type, raw_id in mark(commit_changes.added, 'a') \
                                 + mark(commit_changes.removed, 'r') \
                                 + mark(commit_changes.common, 'c'):
 
                 if raw_id in commit_cache:
                     commit = commit_cache[raw_id]
                 else:
                     try:
                         commit = commits_source_repo.get_commit(raw_id)
                     except CommitDoesNotExistError:
                         # in case we fail extracting still use "dummy" commit
                         # for display in commit diff
                         commit = h.AttributeDict(
                             {'raw_id': raw_id,
                              'message': 'EMPTY or MISSING COMMIT'})
                 c.commit_changes.append([c_type, commit])
 
             # current user review statuses for each version
             c.review_versions = {}
             if self._rhodecode_user.user_id in allowed_reviewers:
                 for co in general_comments:
                     if co.author.user_id == self._rhodecode_user.user_id:
                         # each comment has a status change
                         status = co.status_change
                         if status:
                             _ver_pr = status[0].comment.pull_request_version_id
                             c.review_versions[_ver_pr] = status[0]
 
         return self._get_template_context(c)
 
     def assure_not_empty_repo(self):
         _ = self.request.translate
 
         try:
             self.db_repo.scm_instance().get_commit()
         except EmptyRepositoryError:
             h.flash(h.literal(_('There are no commits yet')),
                     category='warning')
             raise HTTPFound(
                 h.route_path('repo_summary', repo_name=self.db_repo.repo_name))
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @view_config(
         route_name='pullrequest_new', request_method='GET',
         renderer='rhodecode:templates/pullrequests/pullrequest.mako')
     def pull_request_new(self):
         _ = self.request.translate
         c = self.load_default_context()
 
         self.assure_not_empty_repo()
         source_repo = self.db_repo
 
         commit_id = self.request.GET.get('commit')
         branch_ref = self.request.GET.get('branch')
         bookmark_ref = self.request.GET.get('bookmark')
 
         try:
             source_repo_data = PullRequestModel().generate_repo_data(
                 source_repo, commit_id=commit_id,
                 branch=branch_ref, bookmark=bookmark_ref, translator=self.request.translate)
         except CommitDoesNotExistError as e:
             log.exception(e)
             h.flash(_('Commit does not exist'), 'error')
             raise HTTPFound(
                 h.route_path('pullrequest_new', repo_name=source_repo.repo_name))
 
         default_target_repo = source_repo
 
         if source_repo.parent:
             parent_vcs_obj = source_repo.parent.scm_instance()
             if parent_vcs_obj and not parent_vcs_obj.is_empty():
                 # change default if we have a parent repo
                 default_target_repo = source_repo.parent
 
         target_repo_data = PullRequestModel().generate_repo_data(
             default_target_repo, translator=self.request.translate)
 
         selected_source_ref = source_repo_data['refs']['selected_ref']
 
         title_source_ref = selected_source_ref.split(':', 2)[1]
         c.default_title = PullRequestModel().generate_pullrequest_title(
             source=source_repo.repo_name,
             source_ref=title_source_ref,
             target=default_target_repo.repo_name
         )
 
         c.default_repo_data = {
             'source_repo_name': source_repo.repo_name,
             'source_refs_json': json.dumps(source_repo_data),
             'target_repo_name': default_target_repo.repo_name,
             'target_refs_json': json.dumps(target_repo_data),
         }
         c.default_source_ref = selected_source_ref
 
         return self._get_template_context(c)
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @view_config(
         route_name='pullrequest_repo_refs', request_method='GET',
         renderer='json_ext', xhr=True)
     def pull_request_repo_refs(self):
         self.load_default_context()
         target_repo_name = self.request.matchdict['target_repo_name']
         repo = Repository.get_by_repo_name(target_repo_name)
         if not repo:
             raise HTTPNotFound()
 
         target_perm = HasRepoPermissionAny(
             'repository.read', 'repository.write', 'repository.admin')(
             target_repo_name)
         if not target_perm:
             raise HTTPNotFound()
 
         return PullRequestModel().generate_repo_data(
             repo, translator=self.request.translate)
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @view_config(
         route_name='pullrequest_repo_destinations', request_method='GET',
         renderer='json_ext', xhr=True)
     def pull_request_repo_destinations(self):
         _ = self.request.translate
         filter_query = self.request.GET.get('query')
 
         query = Repository.query() \
             .order_by(func.length(Repository.repo_name)) \
             .filter(
                 or_(Repository.repo_name == self.db_repo.repo_name,
                     Repository.fork_id == self.db_repo.repo_id))
 
         if filter_query:
             ilike_expression = u'%{}%'.format(safe_unicode(filter_query))
             query = query.filter(
                 Repository.repo_name.ilike(ilike_expression))
 
         add_parent = False
         if self.db_repo.parent:
             if filter_query in self.db_repo.parent.repo_name:
                 parent_vcs_obj = self.db_repo.parent.scm_instance()
                 if parent_vcs_obj and not parent_vcs_obj.is_empty():
                     add_parent = True
 
         limit = 20 - 1 if add_parent else 20
         all_repos = query.limit(limit).all()
         if add_parent:
             all_repos += [self.db_repo.parent]
 
         repos = []
         for obj in ScmModel().get_repos(all_repos):
             repos.append({
                 'id': obj['name'],
                 'text': obj['name'],
                 'type': 'repo',
                 'obj': obj['dbrepo']
             })
 
         data = {
             'more': False,
             'results': [{
                 'text': _('Repositories'),
                 'children': repos
             }] if repos else []
         }
         return data
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @CSRFRequired()
     @view_config(
         route_name='pullrequest_create', request_method='POST',
         renderer=None)
     def pull_request_create(self):
         _ = self.request.translate
         self.assure_not_empty_repo()
         self.load_default_context()
 
         controls = peppercorn.parse(self.request.POST.items())
 
         try:
             form = PullRequestForm(
                 self.request.translate, self.db_repo.repo_id)()
             _form = form.to_python(controls)
         except formencode.Invalid as errors:
             if errors.error_dict.get('revisions'):
                 msg = 'Revisions: %s' % errors.error_dict['revisions']
             elif errors.error_dict.get('pullrequest_title'):
                 msg = _('Pull request requires a title with min. 3 chars')
             else:
                 msg = _('Error creating pull request: {}').format(errors)
             log.exception(msg)
             h.flash(msg, 'error')
 
             # would rather just go back to form ...
             raise HTTPFound(
                 h.route_path('pullrequest_new', repo_name=self.db_repo_name))
 
         source_repo = _form['source_repo']
         source_ref = _form['source_ref']
         target_repo = _form['target_repo']
         target_ref = _form['target_ref']
         commit_ids = _form['revisions'][::-1]
 
         # find the ancestor for this pr
         source_db_repo = Repository.get_by_repo_name(_form['source_repo'])
         target_db_repo = Repository.get_by_repo_name(_form['target_repo'])
 
         # re-check permissions again here
         # source_repo we must have read permissions
 
         source_perm = HasRepoPermissionAny(
             'repository.read',
             'repository.write', 'repository.admin')(source_db_repo.repo_name)
         if not source_perm:
             msg = _('Not Enough permissions to source repo `{}`.'.format(
                 source_db_repo.repo_name))
             h.flash(msg, category='error')
             # copy the args back to redirect
             org_query = self.request.GET.mixed()
             raise HTTPFound(
                 h.route_path('pullrequest_new', repo_name=self.db_repo_name,
                              _query=org_query))
 
         # target repo we must have read permissions, and also later on
         # we want to check branch permissions here
         target_perm = HasRepoPermissionAny(
             'repository.read',
             'repository.write', 'repository.admin')(target_db_repo.repo_name)
         if not target_perm:
             msg = _('Not Enough permissions to target repo `{}`.'.format(
                 target_db_repo.repo_name))
             h.flash(msg, category='error')
             # copy the args back to redirect
             org_query = self.request.GET.mixed()
             raise HTTPFound(
                 h.route_path('pullrequest_new', repo_name=self.db_repo_name,
                              _query=org_query))
 
         source_scm = source_db_repo.scm_instance()
         target_scm = target_db_repo.scm_instance()
 
         source_commit = source_scm.get_commit(source_ref.split(':')[-1])
         target_commit = target_scm.get_commit(target_ref.split(':')[-1])
 
         ancestor = source_scm.get_common_ancestor(
             source_commit.raw_id, target_commit.raw_id, target_scm)
 
         target_ref_type, target_ref_name, __ = _form['target_ref'].split(':')
         target_ref = ':'.join((target_ref_type, target_ref_name, ancestor))
 
         pullrequest_title = _form['pullrequest_title']
         title_source_ref = source_ref.split(':', 2)[1]
         if not pullrequest_title:
             pullrequest_title = PullRequestModel().generate_pullrequest_title(
                 source=source_repo,
                 source_ref=title_source_ref,
                 target=target_repo
             )
 
         description = _form['pullrequest_desc']
 
         get_default_reviewers_data, validate_default_reviewers = \
             PullRequestModel().get_reviewer_functions()
 
         # recalculate reviewers logic, to make sure we can validate this
         reviewer_rules = get_default_reviewers_data(
             self._rhodecode_db_user, source_db_repo,
             source_commit, target_db_repo, target_commit)
 
         given_reviewers = _form['review_members']
         reviewers = validate_default_reviewers(given_reviewers, reviewer_rules)
 
         try:
             pull_request = PullRequestModel().create(
                 self._rhodecode_user.user_id, source_repo, source_ref,
                 target_repo, target_ref, commit_ids, reviewers,
                 pullrequest_title, description, reviewer_rules
             )
             Session().commit()
 
             h.flash(_('Successfully opened new pull request'),
                     category='success')
         except Exception:
             msg = _('Error occurred during creation of this pull request.')
             log.exception(msg)
             h.flash(msg, category='error')
 
             # copy the args back to redirect
             org_query = self.request.GET.mixed()
             raise HTTPFound(
                 h.route_path('pullrequest_new', repo_name=self.db_repo_name,
                              _query=org_query))
 
         raise HTTPFound(
             h.route_path('pullrequest_show', repo_name=target_repo,
                          pull_request_id=pull_request.pull_request_id))
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @CSRFRequired()
     @view_config(
         route_name='pullrequest_update', request_method='POST',
         renderer='json_ext')
     def pull_request_update(self):
         pull_request = PullRequest.get_or_404(
             self.request.matchdict['pull_request_id'])
         _ = self.request.translate
 
         self.load_default_context()
 
         if pull_request.is_closed():
             log.debug('update: forbidden because pull request is closed')
             msg = _(u'Cannot update closed pull requests.')
             h.flash(msg, category='error')
             return True
 
         # only owner or admin can update it
         allowed_to_update = PullRequestModel().check_user_update(
             pull_request, self._rhodecode_user)
         if allowed_to_update:
             controls = peppercorn.parse(self.request.POST.items())
 
             if 'review_members' in controls:
                 self._update_reviewers(
                     pull_request, controls['review_members'],
                     pull_request.reviewer_data)
             elif str2bool(self.request.POST.get('update_commits', 'false')):
                 self._update_commits(pull_request)
             elif str2bool(self.request.POST.get('edit_pull_request', 'false')):
                 self._edit_pull_request(pull_request)
             else:
                 raise HTTPBadRequest()
             return True
         raise HTTPForbidden()
 
     def _edit_pull_request(self, pull_request):
         _ = self.request.translate
         try:
             PullRequestModel().edit(
                 pull_request, self.request.POST.get('title'),
                 self.request.POST.get('description'), self._rhodecode_user)
         except ValueError:
             msg = _(u'Cannot update closed pull requests.')
             h.flash(msg, category='error')
             return
         else:
             Session().commit()
 
         msg = _(u'Pull request title & description updated.')
         h.flash(msg, category='success')
         return
 
     def _update_commits(self, pull_request):
         _ = self.request.translate
         resp = PullRequestModel().update_commits(pull_request)
 
         if resp.executed:
 
             if resp.target_changed and resp.source_changed:
                 changed = 'target and source repositories'
             elif resp.target_changed and not resp.source_changed:
                 changed = 'target repository'
             elif not resp.target_changed and resp.source_changed:
                 changed = 'source repository'
             else:
                 changed = 'nothing'
 
             msg = _(
                 u'Pull request updated to "{source_commit_id}" with '
                 u'{count_added} added, {count_removed} removed commits. '
                 u'Source of changes: {change_source}')
             msg = msg.format(
                 source_commit_id=pull_request.source_ref_parts.commit_id,
                 count_added=len(resp.changes.added),
                 count_removed=len(resp.changes.removed),
                 change_source=changed)
             h.flash(msg, category='success')
 
             channel = '/repo${}$/pr/{}'.format(
                 pull_request.target_repo.repo_name,
                 pull_request.pull_request_id)
             message = msg + (
                 ' - <a onclick="window.location.reload()">'
                 '<strong>{}</strong></a>'.format(_('Reload page')))
             channelstream.post_message(
                 channel, message, self._rhodecode_user.username,
                 registry=self.request.registry)
         else:
             msg = PullRequestModel.UPDATE_STATUS_MESSAGES[resp.reason]
             warning_reasons = [
                 UpdateFailureReason.NO_CHANGE,
                 UpdateFailureReason.WRONG_REF_TYPE,
             ]
             category = 'warning' if resp.reason in warning_reasons else 'error'
             h.flash(msg, category=category)
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @CSRFRequired()
     @view_config(
         route_name='pullrequest_merge', request_method='POST',
         renderer='json_ext')
     def pull_request_merge(self):
         """
         Merge will perform a server-side merge of the specified
         pull request, if the pull request is approved and mergeable.
         After successful merging, the pull request is automatically
         closed, with a relevant comment.
         """
         pull_request = PullRequest.get_or_404(
             self.request.matchdict['pull_request_id'])
 
         self.load_default_context()
         check = MergeCheck.validate(pull_request, self._rhodecode_db_user,
                                     translator=self.request.translate)
         merge_possible = not check.failed
 
         for err_type, error_msg in check.errors:
             h.flash(error_msg, category=err_type)
 
         if merge_possible:
             log.debug("Pre-conditions checked, trying to merge.")
             extras = vcs_operation_context(
                 self.request.environ, repo_name=pull_request.target_repo.repo_name,
                 username=self._rhodecode_db_user.username, action='push',
                 scm=pull_request.target_repo.repo_type)
             self._merge_pull_request(
                 pull_request, self._rhodecode_db_user, extras)
         else:
             log.debug("Pre-conditions failed, NOT merging.")
 
         raise HTTPFound(
             h.route_path('pullrequest_show',
                          repo_name=pull_request.target_repo.repo_name,
                          pull_request_id=pull_request.pull_request_id))
 
     def _merge_pull_request(self, pull_request, user, extras):
         _ = self.request.translate
         merge_resp = PullRequestModel().merge(pull_request, user, extras=extras)
 
         if merge_resp.executed:
             log.debug("The merge was successful, closing the pull request.")
             PullRequestModel().close_pull_request(
                 pull_request.pull_request_id, user)
             Session().commit()
             msg = _('Pull request was successfully merged and closed.')
             h.flash(msg, category='success')
         else:
             log.debug(
                 "The merge was not successful. Merge response: %s",
                 merge_resp)
             msg = PullRequestModel().merge_status_message(
                 merge_resp.failure_reason)
             h.flash(msg, category='error')
 
     def _update_reviewers(self, pull_request, review_members, reviewer_rules):
         _ = self.request.translate
         get_default_reviewers_data, validate_default_reviewers = \
             PullRequestModel().get_reviewer_functions()
 
         try:
             reviewers = validate_default_reviewers(review_members, reviewer_rules)
         except ValueError as e:
             log.error('Reviewers Validation: {}'.format(e))
             h.flash(e, category='error')
             return
 
         PullRequestModel().update_reviewers(
             pull_request, reviewers, self._rhodecode_user)
         h.flash(_('Pull request reviewers updated.'), category='success')
         Session().commit()
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @CSRFRequired()
     @view_config(
         route_name='pullrequest_delete', request_method='POST',
         renderer='json_ext')
     def pull_request_delete(self):
         _ = self.request.translate
 
         pull_request = PullRequest.get_or_404(
             self.request.matchdict['pull_request_id'])
         self.load_default_context()
 
         pr_closed = pull_request.is_closed()
         allowed_to_delete = PullRequestModel().check_user_delete(
             pull_request, self._rhodecode_user) and not pr_closed
 
         # only owner can delete it !
         if allowed_to_delete:
             PullRequestModel().delete(pull_request, self._rhodecode_user)
             Session().commit()
             h.flash(_('Successfully deleted pull request'),
                     category='success')
             raise HTTPFound(h.route_path('pullrequest_show_all',
                                          repo_name=self.db_repo_name))
 
         log.warning('user %s tried to delete pull request without access',
                     self._rhodecode_user)
         raise HTTPNotFound()
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @CSRFRequired()
     @view_config(
         route_name='pullrequest_comment_create', request_method='POST',
         renderer='json_ext')
     def pull_request_comment_create(self):
         _ = self.request.translate
 
         pull_request = PullRequest.get_or_404(
             self.request.matchdict['pull_request_id'])
         pull_request_id = pull_request.pull_request_id
 
         if pull_request.is_closed():
             log.debug('comment: forbidden because pull request is closed')
             raise HTTPForbidden()
 
         allowed_to_comment = PullRequestModel().check_user_comment(
             pull_request, self._rhodecode_user)
         if not allowed_to_comment:
             log.debug(
                 'comment: forbidden because pull request is from forbidden repo')
             raise HTTPForbidden()
 
         c = self.load_default_context()
 
         status = self.request.POST.get('changeset_status', None)
         text = self.request.POST.get('text')
         comment_type = self.request.POST.get('comment_type')
         resolves_comment_id = self.request.POST.get('resolves_comment_id', None)
         close_pull_request = self.request.POST.get('close_pull_request')
 
         # the logic here should work like following, if we submit close
         # pr comment, use `close_pull_request_with_comment` function
         # else handle regular comment logic
 
         if close_pull_request:
             # only owner or admin or person with write permissions
             allowed_to_close = PullRequestModel().check_user_update(
                 pull_request, self._rhodecode_user)
             if not allowed_to_close:
                 log.debug('comment: forbidden because not allowed to close '
                           'pull request %s', pull_request_id)
                 raise HTTPForbidden()
             comment, status = PullRequestModel().close_pull_request_with_comment(
                 pull_request, self._rhodecode_user, self.db_repo, message=text)
             Session().flush()
             events.trigger(
                 events.PullRequestCommentEvent(pull_request, comment))
 
         else:
             # regular comment case, could be inline, or one with status.
             # for that one we check also permissions
 
             allowed_to_change_status = PullRequestModel().check_user_change_status(
                 pull_request, self._rhodecode_user)
 
             if status and allowed_to_change_status:
                 message = (_('Status change %(transition_icon)s %(status)s')
                            % {'transition_icon': '>',
                               'status': ChangesetStatus.get_status_lbl(status)})
                 text = text or message
 
             comment = CommentsModel().create(
                 text=text,
                 repo=self.db_repo.repo_id,
                 user=self._rhodecode_user.user_id,
                 pull_request=pull_request,
                 f_path=self.request.POST.get('f_path'),
                 line_no=self.request.POST.get('line'),
                 status_change=(ChangesetStatus.get_status_lbl(status)
                                if status and allowed_to_change_status else None),
                 status_change_type=(status
                                     if status and allowed_to_change_status else None),
                 comment_type=comment_type,
                 resolves_comment_id=resolves_comment_id
             )
 
             if allowed_to_change_status:
                 # calculate old status before we change it
                 old_calculated_status = pull_request.calculated_review_status()
 
                 # get status if set !
                 if status:
                     ChangesetStatusModel().set_status(
                         self.db_repo.repo_id,
                         status,
                         self._rhodecode_user.user_id,
                         comment,
                         pull_request=pull_request
                     )
 
                 Session().flush()
                 events.trigger(
                     events.PullRequestCommentEvent(pull_request, comment))
 
                 # we now calculate the status of pull request, and based on that
                 # calculation we set the commits status
                 calculated_status = pull_request.calculated_review_status()
                 if old_calculated_status != calculated_status:
                     PullRequestModel()._trigger_pull_request_hook(
                         pull_request, self._rhodecode_user, 'review_status_change')
 
         Session().commit()
 
         data = {
             'target_id': h.safeid(h.safe_unicode(
                 self.request.POST.get('f_path'))),
         }
         if comment:
             c.co = comment
             rendered_comment = render(
                 'rhodecode:templates/changeset/changeset_comment_block.mako',
                 self._get_template_context(c), self.request)
 
             data.update(comment.get_dict())
             data.update({'rendered_text': rendered_comment})
 
         return data
 
     @LoginRequired()
     @NotAnonymous()
     @HasRepoPermissionAnyDecorator(
         'repository.read', 'repository.write', 'repository.admin')
     @CSRFRequired()
     @view_config(
         route_name='pullrequest_comment_delete', request_method='POST',
         renderer='json_ext')
     def pull_request_comment_delete(self):
         pull_request = PullRequest.get_or_404(
             self.request.matchdict['pull_request_id'])
 
         comment = ChangesetComment.get_or_404(
             self.request.matchdict['comment_id'])
         comment_id = comment.comment_id
 
         if pull_request.is_closed():
             log.debug('comment: forbidden because pull request is closed')
             raise HTTPForbidden()
 
         if not comment:
             log.debug('Comment with id:%s not found, skipping', comment_id)
             # comment already deleted in another call probably
             return True
 
         if comment.pull_request.is_closed():
             # don't allow deleting comments on closed pull request
             raise HTTPForbidden()
 
         is_repo_admin = h.HasRepoPermissionAny('repository.admin')(self.db_repo_name)
         super_admin = h.HasPermissionAny('hg.admin')()
         comment_owner = comment.author.user_id == self._rhodecode_user.user_id
         is_repo_comment = comment.repo.repo_name == self.db_repo_name
         comment_repo_admin = is_repo_admin and is_repo_comment
 
         if super_admin or comment_owner or comment_repo_admin:
             old_calculated_status = comment.pull_request.calculated_review_status()
             CommentsModel().delete(comment=comment, user=self._rhodecode_user)
             Session().commit()
             calculated_status = comment.pull_request.calculated_review_status()
             if old_calculated_status != calculated_status:
                 PullRequestModel()._trigger_pull_request_hook(
                     comment.pull_request, self._rhodecode_user, 'review_status_change')
             return True
         else:
             log.warning('No permissions for user %s to delete comment_id: %s',
                         self._rhodecode_db_user, comment_id)
             raise HTTPNotFound()

rhodecode/model/pull_request.py

@@ -1,1628 +1,1651 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2012-2017 RhodeCode GmbH
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 
 """
 pull request model for RhodeCode
 """
 
 
 import json
 import logging
 import datetime
 import urllib
 import collections
 
 from pyramid.threadlocal import get_current_request
 
 from rhodecode import events
 from rhodecode.translation import lazy_ugettext#, _
 from rhodecode.lib import helpers as h, hooks_utils, diffs
 from rhodecode.lib import audit_logger
 from rhodecode.lib.compat import OrderedDict
 from rhodecode.lib.hooks_daemon import prepare_callback_daemon
 from rhodecode.lib.markup_renderer import (
     DEFAULT_COMMENTS_RENDERER, RstTemplateRenderer)
 from rhodecode.lib.utils2 import safe_unicode, safe_str, md5_safe
 from rhodecode.lib.vcs.backends.base import (
     Reference, MergeResponse, MergeFailureReason, UpdateFailureReason)
 from rhodecode.lib.vcs.conf import settings as vcs_settings
 from rhodecode.lib.vcs.exceptions import (
     CommitDoesNotExistError, EmptyRepositoryError)
 from rhodecode.model import BaseModel
 from rhodecode.model.changeset_status import ChangesetStatusModel
 from rhodecode.model.comment import CommentsModel
 from rhodecode.model.db import (
     or_, PullRequest, PullRequestReviewers, ChangesetStatus,
     PullRequestVersion, ChangesetComment, Repository)
 from rhodecode.model.meta import Session
 from rhodecode.model.notification import NotificationModel, \
     EmailNotificationModel
 from rhodecode.model.scm import ScmModel
 from rhodecode.model.settings import VcsSettingsModel
 
 
 log = logging.getLogger(__name__)
 
 
 # Data structure to hold the response data when updating commits during a pull
 # request update.
 UpdateResponse = collections.namedtuple('UpdateResponse', [
     'executed', 'reason', 'new', 'old', 'changes',
     'source_changed', 'target_changed'])
 
 
 class PullRequestModel(BaseModel):
 
     cls = PullRequest
 
     DIFF_CONTEXT = 3
 
     MERGE_STATUS_MESSAGES = {
         MergeFailureReason.NONE: lazy_ugettext(
             'This pull request can be automatically merged.'),
         MergeFailureReason.UNKNOWN: lazy_ugettext(
             'This pull request cannot be merged because of an unhandled'
             ' exception.'),
         MergeFailureReason.MERGE_FAILED: lazy_ugettext(
             'This pull request cannot be merged because of merge conflicts.'),
         MergeFailureReason.PUSH_FAILED: lazy_ugettext(
             'This pull request could not be merged because push to target'
             ' failed.'),
         MergeFailureReason.TARGET_IS_NOT_HEAD: lazy_ugettext(
             'This pull request cannot be merged because the target is not a'
             ' head.'),
         MergeFailureReason.HG_SOURCE_HAS_MORE_BRANCHES: lazy_ugettext(
             'This pull request cannot be merged because the source contains'
             ' more branches than the target.'),
         MergeFailureReason.HG_TARGET_HAS_MULTIPLE_HEADS: lazy_ugettext(
             'This pull request cannot be merged because the target has'
             ' multiple heads.'),
         MergeFailureReason.TARGET_IS_LOCKED: lazy_ugettext(
             'This pull request cannot be merged because the target repository'
             ' is locked.'),
         MergeFailureReason._DEPRECATED_MISSING_COMMIT: lazy_ugettext(
             'This pull request cannot be merged because the target or the '
             'source reference is missing.'),
         MergeFailureReason.MISSING_TARGET_REF: lazy_ugettext(
             'This pull request cannot be merged because the target '
             'reference is missing.'),
         MergeFailureReason.MISSING_SOURCE_REF: lazy_ugettext(
             'This pull request cannot be merged because the source '
             'reference is missing.'),
         MergeFailureReason.SUBREPO_MERGE_FAILED: lazy_ugettext(
             'This pull request cannot be merged because of conflicts related '
             'to sub repositories.'),
     }
 
     UPDATE_STATUS_MESSAGES = {
         UpdateFailureReason.NONE: lazy_ugettext(
             'Pull request update successful.'),
         UpdateFailureReason.UNKNOWN: lazy_ugettext(
             'Pull request update failed because of an unknown error.'),
         UpdateFailureReason.NO_CHANGE: lazy_ugettext(
             'No update needed because the source and target have not changed.'),
         UpdateFailureReason.WRONG_REF_TYPE: lazy_ugettext(
             'Pull request cannot be updated because the reference type is '
             'not supported for an update. Only Branch, Tag or Bookmark is allowed.'),
         UpdateFailureReason.MISSING_TARGET_REF: lazy_ugettext(
             'This pull request cannot be updated because the target '
             'reference is missing.'),
         UpdateFailureReason.MISSING_SOURCE_REF: lazy_ugettext(
             'This pull request cannot be updated because the source '
             'reference is missing.'),
     }
 
     def __get_pull_request(self, pull_request):
         return self._get_instance((
             PullRequest, PullRequestVersion), pull_request)
 
     def _check_perms(self, perms, pull_request, user, api=False):
         if not api:
             return h.HasRepoPermissionAny(*perms)(
                 user=user, repo_name=pull_request.target_repo.repo_name)
         else:
             return h.HasRepoPermissionAnyApi(*perms)(
                 user=user, repo_name=pull_request.target_repo.repo_name)
 
     def check_user_read(self, pull_request, user, api=False):
         _perms = ('repository.admin', 'repository.write', 'repository.read',)
         return self._check_perms(_perms, pull_request, user, api)
 
     def check_user_merge(self, pull_request, user, api=False):
         _perms = ('repository.admin', 'repository.write', 'hg.admin',)
         return self._check_perms(_perms, pull_request, user, api)
 
     def check_user_update(self, pull_request, user, api=False):
         owner = user.user_id == pull_request.user_id
         return self.check_user_merge(pull_request, user, api) or owner
 
     def check_user_delete(self, pull_request, user):
         owner = user.user_id == pull_request.user_id
         _perms = ('repository.admin',)
         return self._check_perms(_perms, pull_request, user) or owner
 
     def check_user_change_status(self, pull_request, user, api=False):
         reviewer = user.user_id in [x.user_id for x in
                                     pull_request.reviewers]
         return self.check_user_update(pull_request, user, api) or reviewer
 
     def check_user_comment(self, pull_request, user):
         owner = user.user_id == pull_request.user_id
         return self.check_user_read(pull_request, user) or owner
 
     def get(self, pull_request):
         return self.__get_pull_request(pull_request)
 
     def _prepare_get_all_query(self, repo_name, source=False, statuses=None,
                                opened_by=None, order_by=None,
                                order_dir='desc'):
         repo = None
         if repo_name:
             repo = self._get_repo(repo_name)
 
         q = PullRequest.query()
 
         # source or target
         if repo and source:
             q = q.filter(PullRequest.source_repo == repo)
         elif repo:
             q = q.filter(PullRequest.target_repo == repo)
 
         # closed,opened
         if statuses:
             q = q.filter(PullRequest.status.in_(statuses))
 
         # opened by filter
         if opened_by:
             q = q.filter(PullRequest.user_id.in_(opened_by))
 
         if order_by:
             order_map = {
                 'name_raw': PullRequest.pull_request_id,
                 'title': PullRequest.title,
                 'updated_on_raw': PullRequest.updated_on,
                 'target_repo': PullRequest.target_repo_id
             }
             if order_dir == 'asc':
                 q = q.order_by(order_map[order_by].asc())
             else:
                 q = q.order_by(order_map[order_by].desc())
 
         return q
 
     def count_all(self, repo_name, source=False, statuses=None,
                   opened_by=None):
         """
         Count the number of pull requests for a specific repository.
 
         :param repo_name: target or source repo
         :param source: boolean flag to specify if repo_name refers to source
         :param statuses: list of pull request statuses
         :param opened_by: author user of the pull request
         :returns: int number of pull requests
         """
         q = self._prepare_get_all_query(
             repo_name, source=source, statuses=statuses, opened_by=opened_by)
 
         return q.count()
 
     def get_all(self, repo_name, source=False, statuses=None, opened_by=None,
                 offset=0, length=None, order_by=None, order_dir='desc'):
         """
         Get all pull requests for a specific repository.
 
         :param repo_name: target or source repo
         :param source: boolean flag to specify if repo_name refers to source
         :param statuses: list of pull request statuses
         :param opened_by: author user of the pull request
         :param offset: pagination offset
         :param length: length of returned list
         :param order_by: order of the returned list
         :param order_dir: 'asc' or 'desc' ordering direction
         :returns: list of pull requests
         """
         q = self._prepare_get_all_query(
             repo_name, source=source, statuses=statuses, opened_by=opened_by,
             order_by=order_by, order_dir=order_dir)
 
         if length:
             pull_requests = q.limit(length).offset(offset).all()
         else:
             pull_requests = q.all()
 
         return pull_requests
 
     def count_awaiting_review(self, repo_name, source=False, statuses=None,
                               opened_by=None):
         """
         Count the number of pull requests for a specific repository that are
         awaiting review.
 
         :param repo_name: target or source repo
         :param source: boolean flag to specify if repo_name refers to source
         :param statuses: list of pull request statuses
         :param opened_by: author user of the pull request
         :returns: int number of pull requests
         """
         pull_requests = self.get_awaiting_review(
             repo_name, source=source, statuses=statuses, opened_by=opened_by)
 
         return len(pull_requests)
 
     def get_awaiting_review(self, repo_name, source=False, statuses=None,
                             opened_by=None, offset=0, length=None,
                             order_by=None, order_dir='desc'):
         """
         Get all pull requests for a specific repository that are awaiting
         review.
 
         :param repo_name: target or source repo
         :param source: boolean flag to specify if repo_name refers to source
         :param statuses: list of pull request statuses
         :param opened_by: author user of the pull request
         :param offset: pagination offset
         :param length: length of returned list
         :param order_by: order of the returned list
         :param order_dir: 'asc' or 'desc' ordering direction
         :returns: list of pull requests
         """
         pull_requests = self.get_all(
             repo_name, source=source, statuses=statuses, opened_by=opened_by,
             order_by=order_by, order_dir=order_dir)
 
         _filtered_pull_requests = []
         for pr in pull_requests:
             status = pr.calculated_review_status()
             if status in [ChangesetStatus.STATUS_NOT_REVIEWED,
                           ChangesetStatus.STATUS_UNDER_REVIEW]:
                 _filtered_pull_requests.append(pr)
         if length:
             return _filtered_pull_requests[offset:offset+length]
         else:
             return _filtered_pull_requests
 
     def count_awaiting_my_review(self, repo_name, source=False, statuses=None,
                                  opened_by=None, user_id=None):
         """
         Count the number of pull requests for a specific repository that are
         awaiting review from a specific user.
 
         :param repo_name: target or source repo
         :param source: boolean flag to specify if repo_name refers to source
         :param statuses: list of pull request statuses
         :param opened_by: author user of the pull request
         :param user_id: reviewer user of the pull request
         :returns: int number of pull requests
         """
         pull_requests = self.get_awaiting_my_review(
             repo_name, source=source, statuses=statuses, opened_by=opened_by,
             user_id=user_id)
 
         return len(pull_requests)
 
     def get_awaiting_my_review(self, repo_name, source=False, statuses=None,
                                opened_by=None, user_id=None, offset=0,
                                length=None, order_by=None, order_dir='desc'):
         """
         Get all pull requests for a specific repository that are awaiting
         review from a specific user.
 
         :param repo_name: target or source repo
         :param source: boolean flag to specify if repo_name refers to source
         :param statuses: list of pull request statuses
         :param opened_by: author user of the pull request
         :param user_id: reviewer user of the pull request
         :param offset: pagination offset
         :param length: length of returned list
         :param order_by: order of the returned list
         :param order_dir: 'asc' or 'desc' ordering direction
         :returns: list of pull requests
         """
         pull_requests = self.get_all(
             repo_name, source=source, statuses=statuses, opened_by=opened_by,
             order_by=order_by, order_dir=order_dir)
 
         _my = PullRequestModel().get_not_reviewed(user_id)
         my_participation = []
         for pr in pull_requests:
             if pr in _my:
                 my_participation.append(pr)
         _filtered_pull_requests = my_participation
         if length:
             return _filtered_pull_requests[offset:offset+length]
         else:
             return _filtered_pull_requests
 
     def get_not_reviewed(self, user_id):
         return [
             x.pull_request for x in PullRequestReviewers.query().filter(
                 PullRequestReviewers.user_id == user_id).all()
         ]
 
     def _prepare_participating_query(self, user_id=None, statuses=None,
                                      order_by=None, order_dir='desc'):
         q = PullRequest.query()
         if user_id:
             reviewers_subquery = Session().query(
                 PullRequestReviewers.pull_request_id).filter(
                 PullRequestReviewers.user_id == user_id).subquery()
             user_filter = or_(
                 PullRequest.user_id == user_id,
                 PullRequest.pull_request_id.in_(reviewers_subquery)
             )
             q = PullRequest.query().filter(user_filter)
 
         # closed,opened
         if statuses:
             q = q.filter(PullRequest.status.in_(statuses))
 
         if order_by:
             order_map = {
                 'name_raw': PullRequest.pull_request_id,
                 'title': PullRequest.title,
                 'updated_on_raw': PullRequest.updated_on,
                 'target_repo': PullRequest.target_repo_id
             }
             if order_dir == 'asc':
                 q = q.order_by(order_map[order_by].asc())
             else:
                 q = q.order_by(order_map[order_by].desc())
 
         return q
 
     def count_im_participating_in(self, user_id=None, statuses=None):
         q = self._prepare_participating_query(user_id, statuses=statuses)
         return q.count()
 
     def get_im_participating_in(
             self, user_id=None, statuses=None, offset=0,
             length=None, order_by=None, order_dir='desc'):
         """
         Get all Pull requests that i'm participating in, or i have opened
         """
 
         q = self._prepare_participating_query(
             user_id, statuses=statuses, order_by=order_by,
             order_dir=order_dir)
 
         if length:
             pull_requests = q.limit(length).offset(offset).all()
         else:
             pull_requests = q.all()
 
         return pull_requests
 
     def get_versions(self, pull_request):
         """
         returns version of pull request sorted by ID descending
         """
         return PullRequestVersion.query()\
             .filter(PullRequestVersion.pull_request == pull_request)\
             .order_by(PullRequestVersion.pull_request_version_id.asc())\
             .all()
 
+    def get_pr_version(self, pull_request_id, version=None):
+        at_version = None
+
+        if version and version == 'latest':
+            pull_request_ver = PullRequest.get(pull_request_id)
+            pull_request_obj = pull_request_ver
+            _org_pull_request_obj = pull_request_obj
+            at_version = 'latest'
+        elif version:
+            pull_request_ver = PullRequestVersion.get_or_404(version)
+            pull_request_obj = pull_request_ver
+            _org_pull_request_obj = pull_request_ver.pull_request
+            at_version = pull_request_ver.pull_request_version_id
+        else:
+            _org_pull_request_obj = pull_request_obj = PullRequest.get_or_404(
+                pull_request_id)
+
+        pull_request_display_obj = PullRequest.get_pr_display_object(
+            pull_request_obj, _org_pull_request_obj)
+
+        return _org_pull_request_obj, pull_request_obj, \
+               pull_request_display_obj, at_version
+
     def create(self, created_by, source_repo, source_ref, target_repo,
                target_ref, revisions, reviewers, title, description=None,
                reviewer_data=None, translator=None):
         translator = translator or get_current_request().translate
 
         created_by_user = self._get_user(created_by)
         source_repo = self._get_repo(source_repo)
         target_repo = self._get_repo(target_repo)
 
         pull_request = PullRequest()
         pull_request.source_repo = source_repo
         pull_request.source_ref = source_ref
         pull_request.target_repo = target_repo
         pull_request.target_ref = target_ref
         pull_request.revisions = revisions
         pull_request.title = title
         pull_request.description = description
         pull_request.author = created_by_user
         pull_request.reviewer_data = reviewer_data
 
         Session().add(pull_request)
         Session().flush()
 
         reviewer_ids = set()
         # members / reviewers
         for reviewer_object in reviewers:
             user_id, reasons, mandatory = reviewer_object
             user = self._get_user(user_id)
 
             # skip duplicates
             if user.user_id in reviewer_ids:
                 continue
 
             reviewer_ids.add(user.user_id)
 
             reviewer = PullRequestReviewers()
             reviewer.user = user
             reviewer.pull_request = pull_request
             reviewer.reasons = reasons
             reviewer.mandatory = mandatory
             Session().add(reviewer)
 
         # Set approval status to "Under Review" for all commits which are
         # part of this pull request.
         ChangesetStatusModel().set_status(
             repo=target_repo,
             status=ChangesetStatus.STATUS_UNDER_REVIEW,
             user=created_by_user,
             pull_request=pull_request
         )
 
         MergeCheck.validate(
             pull_request, user=created_by_user, translator=translator)
 
         self.notify_reviewers(pull_request, reviewer_ids)
         self._trigger_pull_request_hook(
             pull_request, created_by_user, 'create')
 
         creation_data = pull_request.get_api_data(with_merge_state=False)
         self._log_audit_action(
             'repo.pull_request.create', {'data': creation_data},
             created_by_user, pull_request)
 
         return pull_request
 
     def _trigger_pull_request_hook(self, pull_request, user, action):
         pull_request = self.__get_pull_request(pull_request)
         target_scm = pull_request.target_repo.scm_instance()
         if action == 'create':
             trigger_hook = hooks_utils.trigger_log_create_pull_request_hook
         elif action == 'merge':
             trigger_hook = hooks_utils.trigger_log_merge_pull_request_hook
         elif action == 'close':
             trigger_hook = hooks_utils.trigger_log_close_pull_request_hook
         elif action == 'review_status_change':
             trigger_hook = hooks_utils.trigger_log_review_pull_request_hook
         elif action == 'update':
             trigger_hook = hooks_utils.trigger_log_update_pull_request_hook
         else:
             return
 
         trigger_hook(
             username=user.username,
             repo_name=pull_request.target_repo.repo_name,
             repo_alias=target_scm.alias,
             pull_request=pull_request)
 
     def _get_commit_ids(self, pull_request):
         """
         Return the commit ids of the merged pull request.
 
         This method is not dealing correctly yet with the lack of autoupdates
         nor with the implicit target updates.
         For example: if a commit in the source repo is already in the target it
         will be reported anyways.
         """
         merge_rev = pull_request.merge_rev
         if merge_rev is None:
             raise ValueError('This pull request was not merged yet')
 
         commit_ids = list(pull_request.revisions)
         if merge_rev not in commit_ids:
             commit_ids.append(merge_rev)
 
         return commit_ids
 
     def merge(self, pull_request, user, extras):
         log.debug("Merging pull request %s", pull_request.pull_request_id)
         merge_state = self._merge_pull_request(pull_request, user, extras)
         if merge_state.executed:
             log.debug(
                 "Merge was successful, updating the pull request comments.")
             self._comment_and_close_pr(pull_request, user, merge_state)
 
             self._log_audit_action(
                 'repo.pull_request.merge',
                 {'merge_state': merge_state.__dict__},
                 user, pull_request)
 
         else:
             log.warn("Merge failed, not updating the pull request.")
         return merge_state
 
     def _merge_pull_request(self, pull_request, user, extras, merge_msg=None):
         target_vcs = pull_request.target_repo.scm_instance()
         source_vcs = pull_request.source_repo.scm_instance()
         target_ref = self._refresh_reference(
             pull_request.target_ref_parts, target_vcs)
 
         message = merge_msg or (
             'Merge pull request #%(pr_id)s from '
             '%(source_repo)s %(source_ref_name)s\n\n %(pr_title)s') % {
                 'pr_id': pull_request.pull_request_id,
                 'source_repo': source_vcs.name,
                 'source_ref_name': pull_request.source_ref_parts.name,
                 'pr_title': pull_request.title
             }
 
         workspace_id = self._workspace_id(pull_request)
         use_rebase = self._use_rebase_for_merging(pull_request)
         close_branch = self._close_branch_before_merging(pull_request)
 
         callback_daemon, extras = prepare_callback_daemon(
             extras, protocol=vcs_settings.HOOKS_PROTOCOL,
             use_direct_calls=vcs_settings.HOOKS_DIRECT_CALLS)
 
         with callback_daemon:
             # TODO: johbo: Implement a clean way to run a config_override
             # for a single call.
             target_vcs.config.set(
                 'rhodecode', 'RC_SCM_DATA', json.dumps(extras))
             merge_state = target_vcs.merge(
                 target_ref, source_vcs, pull_request.source_ref_parts,
                 workspace_id, user_name=user.username,
                 user_email=user.email, message=message, use_rebase=use_rebase,
                 close_branch=close_branch)
         return merge_state
 
     def _comment_and_close_pr(self, pull_request, user, merge_state, close_msg=None):
         pull_request.merge_rev = merge_state.merge_ref.commit_id
         pull_request.updated_on = datetime.datetime.now()
         close_msg = close_msg or 'Pull request merged and closed'
 
         CommentsModel().create(
             text=safe_unicode(close_msg),
             repo=pull_request.target_repo.repo_id,
             user=user.user_id,
             pull_request=pull_request.pull_request_id,
             f_path=None,
             line_no=None,
             closing_pr=True
         )
 
         Session().add(pull_request)
         Session().flush()
         # TODO: paris: replace invalidation with less radical solution
         ScmModel().mark_for_invalidation(
             pull_request.target_repo.repo_name)
         self._trigger_pull_request_hook(pull_request, user, 'merge')
 
     def has_valid_update_type(self, pull_request):
         source_ref_type = pull_request.source_ref_parts.type
         return source_ref_type in ['book', 'branch', 'tag']
 
     def update_commits(self, pull_request):
         """
         Get the updated list of commits for the pull request
         and return the new pull request version and the list
         of commits processed by this update action
         """
         pull_request = self.__get_pull_request(pull_request)
         source_ref_type = pull_request.source_ref_parts.type
         source_ref_name = pull_request.source_ref_parts.name
         source_ref_id = pull_request.source_ref_parts.commit_id
 
         target_ref_type = pull_request.target_ref_parts.type
         target_ref_name = pull_request.target_ref_parts.name
         target_ref_id = pull_request.target_ref_parts.commit_id
 
         if not self.has_valid_update_type(pull_request):
             log.debug(
                 "Skipping update of pull request %s due to ref type: %s",
                 pull_request, source_ref_type)
             return UpdateResponse(
                 executed=False,
                 reason=UpdateFailureReason.WRONG_REF_TYPE,
                 old=pull_request, new=None, changes=None,
                 source_changed=False, target_changed=False)
 
         # source repo
         source_repo = pull_request.source_repo.scm_instance()
         try:
             source_commit = source_repo.get_commit(commit_id=source_ref_name)
         except CommitDoesNotExistError:
             return UpdateResponse(
                 executed=False,
                 reason=UpdateFailureReason.MISSING_SOURCE_REF,
                 old=pull_request, new=None, changes=None,
                 source_changed=False, target_changed=False)
 
         source_changed = source_ref_id != source_commit.raw_id
 
         # target repo
         target_repo = pull_request.target_repo.scm_instance()
         try:
             target_commit = target_repo.get_commit(commit_id=target_ref_name)
         except CommitDoesNotExistError:
             return UpdateResponse(
                 executed=False,
                 reason=UpdateFailureReason.MISSING_TARGET_REF,
                 old=pull_request, new=None, changes=None,
                 source_changed=False, target_changed=False)
         target_changed = target_ref_id != target_commit.raw_id
 
         if not (source_changed or target_changed):
             log.debug("Nothing changed in pull request %s", pull_request)
             return UpdateResponse(
                 executed=False,
                 reason=UpdateFailureReason.NO_CHANGE,
                 old=pull_request, new=None, changes=None,
                 source_changed=target_changed, target_changed=source_changed)
 
         change_in_found = 'target repo' if target_changed else 'source repo'
         log.debug('Updating pull request because of change in %s detected',
                   change_in_found)
 
         # Finally there is a need for an update, in case of source change
         # we create a new version, else just an update
         if source_changed:
             pull_request_version = self._create_version_from_snapshot(pull_request)
             self._link_comments_to_version(pull_request_version)
         else:
             try:
                 ver = pull_request.versions[-1]
             except IndexError:
                 ver = None
 
             pull_request.pull_request_version_id = \
                 ver.pull_request_version_id if ver else None
             pull_request_version = pull_request
 
         try:
             if target_ref_type in ('tag', 'branch', 'book'):
                 target_commit = target_repo.get_commit(target_ref_name)
             else:
                 target_commit = target_repo.get_commit(target_ref_id)
         except CommitDoesNotExistError:
             return UpdateResponse(
                 executed=False,
                 reason=UpdateFailureReason.MISSING_TARGET_REF,
                 old=pull_request, new=None, changes=None,
                 source_changed=source_changed, target_changed=target_changed)
 
         # re-compute commit ids
         old_commit_ids = pull_request.revisions
         pre_load = ["author", "branch", "date", "message"]
         commit_ranges = target_repo.compare(
             target_commit.raw_id, source_commit.raw_id, source_repo, merge=True,
             pre_load=pre_load)
 
         ancestor = target_repo.get_common_ancestor(
             target_commit.raw_id, source_commit.raw_id, source_repo)
 
         pull_request.source_ref = '%s:%s:%s' % (
             source_ref_type, source_ref_name, source_commit.raw_id)
         pull_request.target_ref = '%s:%s:%s' % (
             target_ref_type, target_ref_name, ancestor)
 
         pull_request.revisions = [
             commit.raw_id for commit in reversed(commit_ranges)]
         pull_request.updated_on = datetime.datetime.now()
         Session().add(pull_request)
         new_commit_ids = pull_request.revisions
 
         old_diff_data, new_diff_data = self._generate_update_diffs(
             pull_request, pull_request_version)
 
         # calculate commit and file changes
         changes = self._calculate_commit_id_changes(
             old_commit_ids, new_commit_ids)
         file_changes = self._calculate_file_changes(
             old_diff_data, new_diff_data)
 
         # set comments as outdated if DIFFS changed
         CommentsModel().outdate_comments(
             pull_request, old_diff_data=old_diff_data,
             new_diff_data=new_diff_data)
 
         commit_changes = (changes.added or changes.removed)
         file_node_changes = (
             file_changes.added or file_changes.modified or file_changes.removed)
         pr_has_changes = commit_changes or file_node_changes
 
         # Add an automatic comment to the pull request, in case
         # anything has changed
         if pr_has_changes:
             update_comment = CommentsModel().create(
                 text=self._render_update_message(changes, file_changes),
                 repo=pull_request.target_repo,
                 user=pull_request.author,
                 pull_request=pull_request,
                 send_email=False, renderer=DEFAULT_COMMENTS_RENDERER)
 
             # Update status to "Under Review" for added commits
             for commit_id in changes.added:
                 ChangesetStatusModel().set_status(
                     repo=pull_request.source_repo,
                     status=ChangesetStatus.STATUS_UNDER_REVIEW,
                     comment=update_comment,
                     user=pull_request.author,
                     pull_request=pull_request,
                     revision=commit_id)
 
         log.debug(
             'Updated pull request %s, added_ids: %s, common_ids: %s, '
             'removed_ids: %s', pull_request.pull_request_id,
             changes.added, changes.common, changes.removed)
         log.debug(
             'Updated pull request with the following file changes: %s',
             file_changes)
 
         log.info(
             "Updated pull request %s from commit %s to commit %s, "
             "stored new version %s of this pull request.",
             pull_request.pull_request_id, source_ref_id,
             pull_request.source_ref_parts.commit_id,
             pull_request_version.pull_request_version_id)
         Session().commit()
         self._trigger_pull_request_hook(
             pull_request, pull_request.author, 'update')
 
         return UpdateResponse(
             executed=True, reason=UpdateFailureReason.NONE,
             old=pull_request, new=pull_request_version, changes=changes,
             source_changed=source_changed, target_changed=target_changed)
 
     def _create_version_from_snapshot(self, pull_request):
         version = PullRequestVersion()
         version.title = pull_request.title
         version.description = pull_request.description
         version.status = pull_request.status
         version.created_on = datetime.datetime.now()
         version.updated_on = pull_request.updated_on
         version.user_id = pull_request.user_id
         version.source_repo = pull_request.source_repo
         version.source_ref = pull_request.source_ref
         version.target_repo = pull_request.target_repo
         version.target_ref = pull_request.target_ref
 
         version._last_merge_source_rev = pull_request._last_merge_source_rev
         version._last_merge_target_rev = pull_request._last_merge_target_rev
         version.last_merge_status = pull_request.last_merge_status
         version.shadow_merge_ref = pull_request.shadow_merge_ref
         version.merge_rev = pull_request.merge_rev
         version.reviewer_data = pull_request.reviewer_data
 
         version.revisions = pull_request.revisions
         version.pull_request = pull_request
         Session().add(version)
         Session().flush()
 
         return version
 
     def _generate_update_diffs(self, pull_request, pull_request_version):
 
         diff_context = (
             self.DIFF_CONTEXT +
             CommentsModel.needed_extra_diff_context())
 
         source_repo = pull_request_version.source_repo
         source_ref_id = pull_request_version.source_ref_parts.commit_id
         target_ref_id = pull_request_version.target_ref_parts.commit_id
         old_diff = self._get_diff_from_pr_or_version(
             source_repo, source_ref_id, target_ref_id, context=diff_context)
 
         source_repo = pull_request.source_repo
         source_ref_id = pull_request.source_ref_parts.commit_id
         target_ref_id = pull_request.target_ref_parts.commit_id
 
         new_diff = self._get_diff_from_pr_or_version(
             source_repo, source_ref_id, target_ref_id, context=diff_context)
 
         old_diff_data = diffs.DiffProcessor(old_diff)
         old_diff_data.prepare()
         new_diff_data = diffs.DiffProcessor(new_diff)
         new_diff_data.prepare()
 
         return old_diff_data, new_diff_data
 
     def _link_comments_to_version(self, pull_request_version):
         """
         Link all unlinked comments of this pull request to the given version.
 
         :param pull_request_version: The `PullRequestVersion` to which
             the comments shall be linked.
 
         """
         pull_request = pull_request_version.pull_request
         comments = ChangesetComment.query()\
             .filter(
                 # TODO: johbo: Should we query for the repo at all here?
                 # Pending decision on how comments of PRs are to be related
                 # to either the source repo, the target repo or no repo at all.
                 ChangesetComment.repo_id == pull_request.target_repo.repo_id,
                 ChangesetComment.pull_request == pull_request,
                 ChangesetComment.pull_request_version == None)\
             .order_by(ChangesetComment.comment_id.asc())
 
         # TODO: johbo: Find out why this breaks if it is done in a bulk
         # operation.
         for comment in comments:
             comment.pull_request_version_id = (
                 pull_request_version.pull_request_version_id)
             Session().add(comment)
 
     def _calculate_commit_id_changes(self, old_ids, new_ids):
         added = [x for x in new_ids if x not in old_ids]
         common = [x for x in new_ids if x in old_ids]
         removed = [x for x in old_ids if x not in new_ids]
         total = new_ids
         return ChangeTuple(added, common, removed, total)
 
     def _calculate_file_changes(self, old_diff_data, new_diff_data):
 
         old_files = OrderedDict()
         for diff_data in old_diff_data.parsed_diff:
             old_files[diff_data['filename']] = md5_safe(diff_data['raw_diff'])
 
         added_files = []
         modified_files = []
         removed_files = []
         for diff_data in new_diff_data.parsed_diff:
             new_filename = diff_data['filename']
             new_hash = md5_safe(diff_data['raw_diff'])
 
             old_hash = old_files.get(new_filename)
             if not old_hash:
                 # file is not present in old diff, means it's added
                 added_files.append(new_filename)
             else:
                 if new_hash != old_hash:
                     modified_files.append(new_filename)
                 # now remove a file from old, since we have seen it already
                 del old_files[new_filename]
 
         # removed files is when there are present in old, but not in NEW,
         # since we remove old files that are present in new diff, left-overs
         # if any should be the removed files
         removed_files.extend(old_files.keys())
 
         return FileChangeTuple(added_files, modified_files, removed_files)
 
     def _render_update_message(self, changes, file_changes):
         """
         render the message using DEFAULT_COMMENTS_RENDERER (RST renderer),
         so it's always looking the same disregarding on which default
         renderer system is using.
 
         :param changes: changes named tuple
         :param file_changes: file changes named tuple
 
         """
         new_status = ChangesetStatus.get_status_lbl(
             ChangesetStatus.STATUS_UNDER_REVIEW)
 
         changed_files = (
             file_changes.added + file_changes.modified + file_changes.removed)
 
         params = {
             'under_review_label': new_status,
             'added_commits': changes.added,
             'removed_commits': changes.removed,
             'changed_files': changed_files,
             'added_files': file_changes.added,
             'modified_files': file_changes.modified,
             'removed_files': file_changes.removed,
         }
         renderer = RstTemplateRenderer()
         return renderer.render('pull_request_update.mako', **params)
 
     def edit(self, pull_request, title, description, user):
         pull_request = self.__get_pull_request(pull_request)
         old_data = pull_request.get_api_data(with_merge_state=False)
         if pull_request.is_closed():
             raise ValueError('This pull request is closed')
         if title:
             pull_request.title = title
         pull_request.description = description
         pull_request.updated_on = datetime.datetime.now()
         Session().add(pull_request)
         self._log_audit_action(
             'repo.pull_request.edit', {'old_data': old_data},
             user, pull_request)
 
     def update_reviewers(self, pull_request, reviewer_data, user):
         """
         Update the reviewers in the pull request
 
         :param pull_request: the pr to update
         :param reviewer_data: list of tuples
             [(user, ['reason1', 'reason2'], mandatory_flag)]
         """
         pull_request = self.__get_pull_request(pull_request)
         if pull_request.is_closed():
             raise ValueError('This pull request is closed')
 
         reviewers = {}
         for user_id, reasons, mandatory in reviewer_data:
             if isinstance(user_id, (int, basestring)):
                 user_id = self._get_user(user_id).user_id
             reviewers[user_id] = {
                 'reasons': reasons, 'mandatory': mandatory}
 
         reviewers_ids = set(reviewers.keys())
         current_reviewers = PullRequestReviewers.query()\
             .filter(PullRequestReviewers.pull_request ==
                     pull_request).all()
         current_reviewers_ids = set([x.user.user_id for x in current_reviewers])
 
         ids_to_add = reviewers_ids.difference(current_reviewers_ids)
         ids_to_remove = current_reviewers_ids.difference(reviewers_ids)
 
         log.debug("Adding %s reviewers", ids_to_add)
         log.debug("Removing %s reviewers", ids_to_remove)
         changed = False
         for uid in ids_to_add:
             changed = True
             _usr = self._get_user(uid)
             reviewer = PullRequestReviewers()
             reviewer.user = _usr
             reviewer.pull_request = pull_request
             reviewer.reasons = reviewers[uid]['reasons']
             # NOTE(marcink): mandatory shouldn't be changed now
             # reviewer.mandatory = reviewers[uid]['reasons']
             Session().add(reviewer)
             self._log_audit_action(
                 'repo.pull_request.reviewer.add', {'data': reviewer.get_dict()},
                 user, pull_request)
 
         for uid in ids_to_remove:
             changed = True
             reviewers = PullRequestReviewers.query()\
                 .filter(PullRequestReviewers.user_id == uid,
                         PullRequestReviewers.pull_request == pull_request)\
                 .all()
             # use .all() in case we accidentally added the same person twice
             # this CAN happen due to the lack of DB checks
             for obj in reviewers:
                 old_data = obj.get_dict()
                 Session().delete(obj)
                 self._log_audit_action(
                     'repo.pull_request.reviewer.delete',
                     {'old_data': old_data}, user, pull_request)
 
         if changed:
             pull_request.updated_on = datetime.datetime.now()
             Session().add(pull_request)
 
         self.notify_reviewers(pull_request, ids_to_add)
         return ids_to_add, ids_to_remove
 
     def get_url(self, pull_request, request=None, permalink=False):
         if not request:
             request = get_current_request()
 
         if permalink:
             return request.route_url(
                 'pull_requests_global',
                 pull_request_id=pull_request.pull_request_id,)
         else:
             return request.route_url('pullrequest_show',
                 repo_name=safe_str(pull_request.target_repo.repo_name),
                 pull_request_id=pull_request.pull_request_id,)
 
     def get_shadow_clone_url(self, pull_request):
         """
         Returns qualified url pointing to the shadow repository. If this pull
         request is closed there is no shadow repository and ``None`` will be
         returned.
         """
         if pull_request.is_closed():
             return None
         else:
             pr_url = urllib.unquote(self.get_url(pull_request))
             return safe_unicode('{pr_url}/repository'.format(pr_url=pr_url))
 
     def notify_reviewers(self, pull_request, reviewers_ids):
         # notification to reviewers
         if not reviewers_ids:
             return
 
         pull_request_obj = pull_request
         # get the current participants of this pull request
         recipients = reviewers_ids
         notification_type = EmailNotificationModel.TYPE_PULL_REQUEST
 
         pr_source_repo = pull_request_obj.source_repo
         pr_target_repo = pull_request_obj.target_repo
 
         pr_url = h.route_url('pullrequest_show',
             repo_name=pr_target_repo.repo_name,
             pull_request_id=pull_request_obj.pull_request_id,)
 
         # set some variables for email notification
         pr_target_repo_url = h.route_url(
             'repo_summary', repo_name=pr_target_repo.repo_name)
 
         pr_source_repo_url = h.route_url(
             'repo_summary', repo_name=pr_source_repo.repo_name)
 
         # pull request specifics
         pull_request_commits = [
             (x.raw_id, x.message)
             for x in map(pr_source_repo.get_commit, pull_request.revisions)]
 
         kwargs = {
             'user': pull_request.author,
             'pull_request': pull_request_obj,
             'pull_request_commits': pull_request_commits,
 
             'pull_request_target_repo': pr_target_repo,
             'pull_request_target_repo_url': pr_target_repo_url,
 
             'pull_request_source_repo': pr_source_repo,
             'pull_request_source_repo_url': pr_source_repo_url,
 
             'pull_request_url': pr_url,
         }
 
         # pre-generate the subject for notification itself
         (subject,
          _h, _e,  # we don't care about those
          body_plaintext) = EmailNotificationModel().render_email(
             notification_type, **kwargs)
 
         # create notification objects, and emails
         NotificationModel().create(
             created_by=pull_request.author,
             notification_subject=subject,
             notification_body=body_plaintext,
             notification_type=notification_type,
             recipients=recipients,
             email_kwargs=kwargs,
         )
 
     def delete(self, pull_request, user):
         pull_request = self.__get_pull_request(pull_request)
         old_data = pull_request.get_api_data(with_merge_state=False)
         self._cleanup_merge_workspace(pull_request)
         self._log_audit_action(
             'repo.pull_request.delete', {'old_data': old_data},
             user, pull_request)
         Session().delete(pull_request)
 
     def close_pull_request(self, pull_request, user):
         pull_request = self.__get_pull_request(pull_request)
         self._cleanup_merge_workspace(pull_request)
         pull_request.status = PullRequest.STATUS_CLOSED
         pull_request.updated_on = datetime.datetime.now()
         Session().add(pull_request)
         self._trigger_pull_request_hook(
             pull_request, pull_request.author, 'close')
 
         pr_data = pull_request.get_api_data(with_merge_state=False)
         self._log_audit_action(
             'repo.pull_request.close', {'data': pr_data}, user, pull_request)
 
     def close_pull_request_with_comment(
             self, pull_request, user, repo, message=None):
 
         pull_request_review_status = pull_request.calculated_review_status()
 
         if pull_request_review_status == ChangesetStatus.STATUS_APPROVED:
             # approved only if we have voting consent
             status = ChangesetStatus.STATUS_APPROVED
         else:
             status = ChangesetStatus.STATUS_REJECTED
         status_lbl = ChangesetStatus.get_status_lbl(status)
 
         default_message = (
             'Closing with status change {transition_icon} {status}.'
         ).format(transition_icon='>', status=status_lbl)
         text = message or default_message
 
         # create a comment, and link it to new status
         comment = CommentsModel().create(
             text=text,
             repo=repo.repo_id,
             user=user.user_id,
             pull_request=pull_request.pull_request_id,
             status_change=status_lbl,
             status_change_type=status,
             closing_pr=True
         )
 
         # calculate old status before we change it
         old_calculated_status = pull_request.calculated_review_status()
         ChangesetStatusModel().set_status(
             repo.repo_id,
             status,
             user.user_id,
             comment=comment,
             pull_request=pull_request.pull_request_id
         )
 
         Session().flush()
         events.trigger(events.PullRequestCommentEvent(pull_request, comment))
         # we now calculate the status of pull request again, and based on that
         # calculation trigger status change. This might happen in cases
         # that non-reviewer admin closes a pr, which means his vote doesn't
         # change the status, while if he's a reviewer this might change it.
         calculated_status = pull_request.calculated_review_status()
         if old_calculated_status != calculated_status:
             self._trigger_pull_request_hook(
                 pull_request, user, 'review_status_change')
 
         # finally close the PR
         PullRequestModel().close_pull_request(
             pull_request.pull_request_id, user)
 
         return comment, status
 
     def merge_status(self, pull_request, translator=None):
         _ = translator or get_current_request().translate
 
         if not self._is_merge_enabled(pull_request):
             return False, _('Server-side pull request merging is disabled.')
         if pull_request.is_closed():
             return False, _('This pull request is closed.')
         merge_possible, msg = self._check_repo_requirements(
             target=pull_request.target_repo, source=pull_request.source_repo,
             translator=_)
         if not merge_possible:
             return merge_possible, msg
 
         try:
             resp = self._try_merge(pull_request)
             log.debug("Merge response: %s", resp)
             status = resp.possible, self.merge_status_message(
                 resp.failure_reason)
         except NotImplementedError:
             status = False, _('Pull request merging is not supported.')
 
         return status
 
     def _check_repo_requirements(self, target, source, translator):
         """
         Check if `target` and `source` have compatible requirements.
 
         Currently this is just checking for largefiles.
         """
         _ = translator
         target_has_largefiles = self._has_largefiles(target)
         source_has_largefiles = self._has_largefiles(source)
         merge_possible = True
         message = u''
 
         if target_has_largefiles != source_has_largefiles:
             merge_possible = False
             if source_has_largefiles:
                 message = _(
                     'Target repository large files support is disabled.')
             else:
                 message = _(
                     'Source repository large files support is disabled.')
 
         return merge_possible, message
 
     def _has_largefiles(self, repo):
         largefiles_ui = VcsSettingsModel(repo=repo).get_ui_settings(
             'extensions', 'largefiles')
         return largefiles_ui and largefiles_ui[0].active
 
     def _try_merge(self, pull_request):
         """
         Try to merge the pull request and return the merge status.
         """
         log.debug(
             "Trying out if the pull request %s can be merged.",
             pull_request.pull_request_id)
         target_vcs = pull_request.target_repo.scm_instance()
 
         # Refresh the target reference.
         try:
             target_ref = self._refresh_reference(
                 pull_request.target_ref_parts, target_vcs)
         except CommitDoesNotExistError:
             merge_state = MergeResponse(
                 False, False, None, MergeFailureReason.MISSING_TARGET_REF)
             return merge_state
 
         target_locked = pull_request.target_repo.locked
         if target_locked and target_locked[0]:
             log.debug("The target repository is locked.")
             merge_state = MergeResponse(
                 False, False, None, MergeFailureReason.TARGET_IS_LOCKED)
         elif self._needs_merge_state_refresh(pull_request, target_ref):
             log.debug("Refreshing the merge status of the repository.")
             merge_state = self._refresh_merge_state(
                 pull_request, target_vcs, target_ref)
         else:
             possible = pull_request.\
                 last_merge_status == MergeFailureReason.NONE
             merge_state = MergeResponse(
                 possible, False, None, pull_request.last_merge_status)
 
         return merge_state
 
     def _refresh_reference(self, reference, vcs_repository):
         if reference.type in ('branch', 'book'):
             name_or_id = reference.name
         else:
             name_or_id = reference.commit_id
         refreshed_commit = vcs_repository.get_commit(name_or_id)
         refreshed_reference = Reference(
             reference.type, reference.name, refreshed_commit.raw_id)
         return refreshed_reference
 
     def _needs_merge_state_refresh(self, pull_request, target_reference):
         return not(
             pull_request.revisions and
             pull_request.revisions[0] == pull_request._last_merge_source_rev and
             target_reference.commit_id == pull_request._last_merge_target_rev)
 
     def _refresh_merge_state(self, pull_request, target_vcs, target_reference):
         workspace_id = self._workspace_id(pull_request)
         source_vcs = pull_request.source_repo.scm_instance()
         use_rebase = self._use_rebase_for_merging(pull_request)
         close_branch = self._close_branch_before_merging(pull_request)
         merge_state = target_vcs.merge(
             target_reference, source_vcs, pull_request.source_ref_parts,
             workspace_id, dry_run=True, use_rebase=use_rebase,
             close_branch=close_branch)
 
         # Do not store the response if there was an unknown error.
         if merge_state.failure_reason != MergeFailureReason.UNKNOWN:
             pull_request._last_merge_source_rev = \
                 pull_request.source_ref_parts.commit_id
             pull_request._last_merge_target_rev = target_reference.commit_id
             pull_request.last_merge_status = merge_state.failure_reason
             pull_request.shadow_merge_ref = merge_state.merge_ref
             Session().add(pull_request)
             Session().commit()
 
         return merge_state
 
     def _workspace_id(self, pull_request):
         workspace_id = 'pr-%s' % pull_request.pull_request_id
         return workspace_id
 
     def merge_status_message(self, status_code):
         """
         Return a human friendly error message for the given merge status code.
         """
         return self.MERGE_STATUS_MESSAGES[status_code]
 
     def generate_repo_data(self, repo, commit_id=None, branch=None,
                            bookmark=None, translator=None):
 
         all_refs, selected_ref = \
             self._get_repo_pullrequest_sources(
                 repo.scm_instance(), commit_id=commit_id,
                 branch=branch, bookmark=bookmark, translator=translator)
 
         refs_select2 = []
         for element in all_refs:
             children = [{'id': x[0], 'text': x[1]} for x in element[0]]
             refs_select2.append({'text': element[1], 'children': children})
 
         return {
             'user': {
                 'user_id': repo.user.user_id,
                 'username': repo.user.username,
                 'firstname': repo.user.first_name,
                 'lastname': repo.user.last_name,
                 'gravatar_link': h.gravatar_url(repo.user.email, 14),
             },
             'description': h.chop_at_smart(repo.description_safe, '\n'),
             'refs': {
                 'all_refs': all_refs,
                 'selected_ref': selected_ref,
                 'select2_refs': refs_select2
             }
         }
 
     def generate_pullrequest_title(self, source, source_ref, target):
         return u'{source}#{at_ref} to {target}'.format(
             source=source,
             at_ref=source_ref,
             target=target,
         )
 
     def _cleanup_merge_workspace(self, pull_request):
         # Merging related cleanup
         target_scm = pull_request.target_repo.scm_instance()
         workspace_id = 'pr-%s' % pull_request.pull_request_id
 
         try:
             target_scm.cleanup_merge_workspace(workspace_id)
         except NotImplementedError:
             pass
 
     def _get_repo_pullrequest_sources(
             self, repo, commit_id=None, branch=None, bookmark=None,
             translator=None):
         """
         Return a structure with repo's interesting commits, suitable for
         the selectors in pullrequest controller
 
         :param commit_id: a commit that must be in the list somehow
             and selected by default
         :param branch: a branch that must be in the list and selected
             by default - even if closed
         :param bookmark: a bookmark that must be in the list and selected
         """
         _ = translator or get_current_request().translate
 
         commit_id = safe_str(commit_id) if commit_id else None
         branch = safe_str(branch) if branch else None
         bookmark = safe_str(bookmark) if bookmark else None
 
         selected = None
 
         # order matters: first source that has commit_id in it will be selected
         sources = []
         sources.append(('book', repo.bookmarks.items(), _('Bookmarks'), bookmark))
         sources.append(('branch', repo.branches.items(), _('Branches'), branch))
 
         if commit_id:
             ref_commit = (h.short_id(commit_id), commit_id)
             sources.append(('rev', [ref_commit], _('Commit IDs'), commit_id))
 
         sources.append(
             ('branch', repo.branches_closed.items(), _('Closed Branches'), branch),
         )
 
         groups = []
         for group_key, ref_list, group_name, match in sources:
             group_refs = []
             for ref_name, ref_id in ref_list:
                 ref_key = '%s:%s:%s' % (group_key, ref_name, ref_id)
                 group_refs.append((ref_key, ref_name))
 
                 if not selected:
                     if set([commit_id, match]) & set([ref_id, ref_name]):
                         selected = ref_key
 
             if group_refs:
                 groups.append((group_refs, group_name))
 
         if not selected:
             ref = commit_id or branch or bookmark
             if ref:
                 raise CommitDoesNotExistError(
                     'No commit refs could be found matching: %s' % ref)
             elif repo.DEFAULT_BRANCH_NAME in repo.branches:
                 selected = 'branch:%s:%s' % (
                     repo.DEFAULT_BRANCH_NAME,
                     repo.branches[repo.DEFAULT_BRANCH_NAME]
                 )
             elif repo.commit_ids:
                 rev = repo.commit_ids[0]
                 selected = 'rev:%s:%s' % (rev, rev)
             else:
                 raise EmptyRepositoryError()
         return groups, selected
 
     def get_diff(self, source_repo, source_ref_id, target_ref_id, context=DIFF_CONTEXT):
         return self._get_diff_from_pr_or_version(
             source_repo, source_ref_id, target_ref_id, context=context)
 
     def _get_diff_from_pr_or_version(
             self, source_repo, source_ref_id, target_ref_id, context):
         target_commit = source_repo.get_commit(
             commit_id=safe_str(target_ref_id))
         source_commit = source_repo.get_commit(
             commit_id=safe_str(source_ref_id))
         if isinstance(source_repo, Repository):
             vcs_repo = source_repo.scm_instance()
         else:
             vcs_repo = source_repo
 
         # TODO: johbo: In the context of an update, we cannot reach
         # the old commit anymore with our normal mechanisms. It needs
         # some sort of special support in the vcs layer to avoid this
         # workaround.
         if (source_commit.raw_id == vcs_repo.EMPTY_COMMIT_ID and
                 vcs_repo.alias == 'git'):
             source_commit.raw_id = safe_str(source_ref_id)
 
         log.debug('calculating diff between '
                   'source_ref:%s and target_ref:%s for repo `%s`',
                   target_ref_id, source_ref_id,
                   safe_unicode(vcs_repo.path))
 
         vcs_diff = vcs_repo.get_diff(
             commit1=target_commit, commit2=source_commit, context=context)
         return vcs_diff
 
     def _is_merge_enabled(self, pull_request):
         return self._get_general_setting(
             pull_request, 'rhodecode_pr_merge_enabled')
 
     def _use_rebase_for_merging(self, pull_request):
         repo_type = pull_request.target_repo.repo_type
         if repo_type == 'hg':
             return self._get_general_setting(
                 pull_request, 'rhodecode_hg_use_rebase_for_merging')
         elif repo_type == 'git':
             return self._get_general_setting(
                 pull_request, 'rhodecode_git_use_rebase_for_merging')
 
         return False
 
     def _close_branch_before_merging(self, pull_request):
         repo_type = pull_request.target_repo.repo_type
         if repo_type == 'hg':
             return self._get_general_setting(
                 pull_request, 'rhodecode_hg_close_branch_before_merging')
         elif repo_type == 'git':
             return self._get_general_setting(
                 pull_request, 'rhodecode_git_close_branch_before_merging')
 
         return False
 
     def _get_general_setting(self, pull_request, settings_key, default=False):
         settings_model = VcsSettingsModel(repo=pull_request.target_repo)
         settings = settings_model.get_general_settings()
         return settings.get(settings_key, default)
 
     def _log_audit_action(self, action, action_data, user, pull_request):
         audit_logger.store(
             action=action,
             action_data=action_data,
             user=user,
             repo=pull_request.target_repo)
 
     def get_reviewer_functions(self):
         """
         Fetches functions for validation and fetching default reviewers.
         If available we use the EE package, else we fallback to CE
         package functions
         """
         try:
             from rc_reviewers.utils import get_default_reviewers_data
             from rc_reviewers.utils import validate_default_reviewers
         except ImportError:
             from rhodecode.apps.repository.utils import \
                 get_default_reviewers_data
             from rhodecode.apps.repository.utils import \
                 validate_default_reviewers
 
         return get_default_reviewers_data, validate_default_reviewers
 
 
 class MergeCheck(object):
     """
     Perform Merge Checks and returns a check object which stores information
     about merge errors, and merge conditions
     """
     TODO_CHECK = 'todo'
     PERM_CHECK = 'perm'
     REVIEW_CHECK = 'review'
     MERGE_CHECK = 'merge'
 
     def __init__(self):
         self.review_status = None
         self.merge_possible = None
         self.merge_msg = ''
         self.failed = None
         self.errors = []
         self.error_details = OrderedDict()
 
     def push_error(self, error_type, message, error_key, details):
         self.failed = True
         self.errors.append([error_type, message])
         self.error_details[error_key] = dict(
             details=details,
             error_type=error_type,
             message=message
         )
 
     @classmethod
     def validate(cls, pull_request, user, translator, fail_early=False):
         _ = translator
         merge_check = cls()
 
         # permissions to merge
         user_allowed_to_merge = PullRequestModel().check_user_merge(
             pull_request, user)
         if not user_allowed_to_merge:
             log.debug("MergeCheck: cannot merge, approval is pending.")
 
             msg = _('User `{}` not allowed to perform merge.').format(user.username)
             merge_check.push_error('error', msg, cls.PERM_CHECK, user.username)
             if fail_early:
                 return merge_check
 
         # review status, must be always present
         review_status = pull_request.calculated_review_status()
         merge_check.review_status = review_status
 
         status_approved = review_status == ChangesetStatus.STATUS_APPROVED
         if not status_approved:
             log.debug("MergeCheck: cannot merge, approval is pending.")
 
             msg = _('Pull request reviewer approval is pending.')
 
             merge_check.push_error(
                 'warning', msg, cls.REVIEW_CHECK, review_status)
 
             if fail_early:
                 return merge_check
 
         # left over TODOs
         todos = CommentsModel().get_unresolved_todos(pull_request)
         if todos:
             log.debug("MergeCheck: cannot merge, {} "
                       "unresolved todos left.".format(len(todos)))
 
             if len(todos) == 1:
                 msg = _('Cannot merge, {} TODO still not resolved.').format(
                     len(todos))
             else:
                 msg = _('Cannot merge, {} TODOs still not resolved.').format(
                     len(todos))
 
             merge_check.push_error('warning', msg, cls.TODO_CHECK, todos)
 
             if fail_early:
                 return merge_check
 
         # merge possible
         merge_status, msg = PullRequestModel().merge_status(
             pull_request, translator=translator)
         merge_check.merge_possible = merge_status
         merge_check.merge_msg = msg
         if not merge_status:
             log.debug(
                 "MergeCheck: cannot merge, pull request merge not possible.")
             merge_check.push_error('warning', msg, cls.MERGE_CHECK, None)
 
             if fail_early:
                 return merge_check
 
         log.debug('MergeCheck: is failed: %s', merge_check.failed)
         return merge_check
 
     @classmethod
     def get_merge_conditions(cls, pull_request, translator):
         _ = translator
         merge_details = {}
 
         model = PullRequestModel()
         use_rebase = model._use_rebase_for_merging(pull_request)
 
         if use_rebase:
             merge_details['merge_strategy'] = dict(
                 details={},
                 message=_('Merge strategy: rebase')
             )
         else:
             merge_details['merge_strategy'] = dict(
                 details={},
                 message=_('Merge strategy: explicit merge commit')
             )
 
         close_branch = model._close_branch_before_merging(pull_request)
         if close_branch:
             repo_type = pull_request.target_repo.repo_type
             if repo_type == 'hg':
                 close_msg = _('Source branch will be closed after merge.')
             elif repo_type == 'git':
                 close_msg = _('Source branch will be deleted after merge.')
 
             merge_details['close_branch'] = dict(
                 details={},
                 message=close_msg
             )
 
         return merge_details
 
 ChangeTuple = collections.namedtuple(
     'ChangeTuple', ['added', 'common', 'removed', 'total'])
 
 FileChangeTuple = collections.namedtuple(
     'FileChangeTuple', ['added', 'modified', 'removed'])