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repository.py
242 lines | 7.8 KiB | text/x-python | PythonLexer
"""
SQLAlchemy migrate repository management.
"""
import os
import shutil
import string
import logging
from pkg_resources import resource_filename
from tempita import Template as TempitaTemplate
from rhodecode.lib.dbmigrate.migrate import exceptions
from rhodecode.lib.dbmigrate.migrate.versioning import version, pathed, cfgparse
from rhodecode.lib.dbmigrate.migrate.versioning.template import Template
from rhodecode.lib.dbmigrate.migrate.versioning.config import *
log = logging.getLogger(__name__)
class Changeset(dict):
"""A collection of changes to be applied to a database.
Changesets are bound to a repository and manage a set of
scripts from that repository.
Behaves like a dict, for the most part. Keys are ordered based on step value.
"""
def __init__(self, start, *changes, **k):
"""
Give a start version; step must be explicitly stated.
"""
self.step = k.pop('step', 1)
self.start = version.VerNum(start)
self.end = self.start
for change in changes:
self.add(change)
def __iter__(self):
return iter(self.items())
def keys(self):
"""
In a series of upgrades x -> y, keys are version x. Sorted.
"""
ret = super(Changeset, self).keys()
# Reverse order if downgrading
ret.sort(reverse=(self.step < 1))
return ret
def values(self):
return [self[k] for k in self.keys()]
def items(self):
return zip(self.keys(), self.values())
def add(self, change):
"""Add new change to changeset"""
key = self.end
self.end += self.step
self[key] = change
def run(self, *p, **k):
"""Run the changeset scripts"""
for version, script in self:
script.run(*p, **k)
class Repository(pathed.Pathed):
"""A project's change script repository"""
_config = 'migrate.cfg'
_versions = 'versions'
def __init__(self, path):
log.debug('Loading repository %s...' % path)
self.verify(path)
super(Repository, self).__init__(path)
self.config = cfgparse.Config(os.path.join(self.path, self._config))
self.versions = version.Collection(os.path.join(self.path,
self._versions))
log.debug('Repository %s loaded successfully' % path)
log.debug('Config: %r' % self.config.to_dict())
@classmethod
def verify(cls, path):
"""
Ensure the target path is a valid repository.
:raises: :exc:`InvalidRepositoryError <migrate.exceptions.InvalidRepositoryError>`
"""
# Ensure the existence of required files
try:
cls.require_found(path)
cls.require_found(os.path.join(path, cls._config))
cls.require_found(os.path.join(path, cls._versions))
except exceptions.PathNotFoundError, e:
raise exceptions.InvalidRepositoryError(path)
@classmethod
def prepare_config(cls, tmpl_dir, name, options=None):
"""
Prepare a project configuration file for a new project.
:param tmpl_dir: Path to Repository template
:param config_file: Name of the config file in Repository template
:param name: Repository name
:type tmpl_dir: string
:type config_file: string
:type name: string
:returns: Populated config file
"""
if options is None:
options = {}
options.setdefault('version_table', 'migrate_version')
options.setdefault('repository_id', name)
options.setdefault('required_dbs', [])
options.setdefault('use_timestamp_numbering', False)
tmpl = open(os.path.join(tmpl_dir, cls._config)).read()
ret = TempitaTemplate(tmpl).substitute(options)
# cleanup
del options['__template_name__']
return ret
@classmethod
def create(cls, path, name, **opts):
"""Create a repository at a specified path"""
cls.require_notfound(path)
theme = opts.pop('templates_theme', None)
t_path = opts.pop('templates_path', None)
# Create repository
tmpl_dir = Template(t_path).get_repository(theme=theme)
shutil.copytree(tmpl_dir, path)
# Edit config defaults
config_text = cls.prepare_config(tmpl_dir, name, options=opts)
fd = open(os.path.join(path, cls._config), 'w')
fd.write(config_text)
fd.close()
opts['repository_name'] = name
# Create a management script
manager = os.path.join(path, 'manage.py')
Repository.create_manage_file(manager, templates_theme=theme,
templates_path=t_path, **opts)
return cls(path)
def create_script(self, description, **k):
"""API to :meth:`migrate.versioning.version.Collection.create_new_python_version`"""
k['use_timestamp_numbering'] = self.use_timestamp_numbering
self.versions.create_new_python_version(description, **k)
def create_script_sql(self, database, description, **k):
"""API to :meth:`migrate.versioning.version.Collection.create_new_sql_version`"""
k['use_timestamp_numbering'] = self.use_timestamp_numbering
self.versions.create_new_sql_version(database, description, **k)
@property
def latest(self):
"""API to :attr:`migrate.versioning.version.Collection.latest`"""
return self.versions.latest
@property
def version_table(self):
"""Returns version_table name specified in config"""
return self.config.get('db_settings', 'version_table')
@property
def id(self):
"""Returns repository id specified in config"""
return self.config.get('db_settings', 'repository_id')
@property
def use_timestamp_numbering(self):
"""Returns use_timestamp_numbering specified in config"""
if self.config.has_option('db_settings', 'use_timestamp_numbering'):
return self.config.getboolean('db_settings', 'use_timestamp_numbering')
return False
def version(self, *p, **k):
"""API to :attr:`migrate.versioning.version.Collection.version`"""
return self.versions.version(*p, **k)
@classmethod
def clear(cls):
# TODO: deletes repo
super(Repository, cls).clear()
version.Collection.clear()
def changeset(self, database, start, end=None):
"""Create a changeset to migrate this database from ver. start to end/latest.
:param database: name of database to generate changeset
:param start: version to start at
:param end: version to end at (latest if None given)
:type database: string
:type start: int
:type end: int
:returns: :class:`Changeset instance <migration.versioning.repository.Changeset>`
"""
start = version.VerNum(start)
if end is None:
end = self.latest
else:
end = version.VerNum(end)
if start <= end:
step = 1
range_mod = 1
op = 'upgrade'
else:
step = -1
range_mod = 0
op = 'downgrade'
versions = range(start + range_mod, end + range_mod, step)
changes = [self.version(v).script(database, op) for v in versions]
ret = Changeset(start, step=step, *changes)
return ret
@classmethod
def create_manage_file(cls, file_, **opts):
"""Create a project management script (manage.py)
:param file_: Destination file to be written
:param opts: Options that are passed to :func:`migrate.versioning.shell.main`
"""
mng_file = Template(opts.pop('templates_path', None))\
.get_manage(theme=opts.pop('templates_theme', None))
tmpl = open(mng_file).read()
fd = open(file_, 'w')
fd.write(TempitaTemplate(tmpl).substitute(opts))
fd.close()