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client_http.py
290 lines | 8.9 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# Copyright (C) 2016-2017 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/
"""
Client for the VCSServer implemented based on HTTP.
"""
import copy
import logging
import threading
import urllib2
import urlparse
import uuid
import pycurl
import msgpack
import requests
from . import exceptions, CurlSession
log = logging.getLogger(__name__)
# TODO: mikhail: Keep it in sync with vcsserver's
# HTTPApplication.ALLOWED_EXCEPTIONS
EXCEPTIONS_MAP = {
'KeyError': KeyError,
'URLError': urllib2.URLError,
}
class RepoMaker(object):
def __init__(self, server_and_port, backend_endpoint, backend_type, session_factory):
self.url = urlparse.urljoin(
'http://%s' % server_and_port, backend_endpoint)
self._session_factory = session_factory
self.backend_type = backend_type
def __call__(self, path, config, with_wire=None):
log.debug('RepoMaker call on %s', path)
return RemoteRepo(
path, config, self.url, self._session_factory(),
with_wire=with_wire)
def __getattr__(self, name):
def f(*args, **kwargs):
return self._call(name, *args, **kwargs)
return f
@exceptions.map_vcs_exceptions
def _call(self, name, *args, **kwargs):
payload = {
'id': str(uuid.uuid4()),
'method': name,
'backend': self.backend_type,
'params': {'args': args, 'kwargs': kwargs}
}
return _remote_call(
self.url, payload, EXCEPTIONS_MAP, self._session_factory())
class ServiceConnection(object):
def __init__(self, server_and_port, backend_endpoint, session_factory):
self.url = urlparse.urljoin(
'http://%s' % server_and_port, backend_endpoint)
self._session_factory = session_factory
def __getattr__(self, name):
def f(*args, **kwargs):
return self._call(name, *args, **kwargs)
return f
@exceptions.map_vcs_exceptions
def _call(self, name, *args, **kwargs):
payload = {
'id': str(uuid.uuid4()),
'method': name,
'params': {'args': args, 'kwargs': kwargs}
}
return _remote_call(
self.url, payload, EXCEPTIONS_MAP, self._session_factory())
class RemoteRepo(object):
def __init__(self, path, config, url, session, with_wire=None):
self.url = url
self._session = session
self._wire = {
"path": path,
"config": config,
"context": self._create_vcs_cache_context(),
}
if with_wire:
self._wire.update(with_wire)
# johbo: Trading complexity for performance. Avoiding the call to
# log.debug brings a few percent gain even if is is not active.
if log.isEnabledFor(logging.DEBUG):
self._call = self._call_with_logging
def __getattr__(self, name):
def f(*args, **kwargs):
return self._call(name, *args, **kwargs)
return f
@exceptions.map_vcs_exceptions
def _call(self, name, *args, **kwargs):
# TODO: oliver: This is currently necessary pre-call since the
# config object is being changed for hooking scenarios
wire = copy.deepcopy(self._wire)
wire["config"] = wire["config"].serialize()
payload = {
'id': str(uuid.uuid4()),
'method': name,
'params': {'wire': wire, 'args': args, 'kwargs': kwargs}
}
return _remote_call(self.url, payload, EXCEPTIONS_MAP, self._session)
def _call_with_logging(self, name, *args, **kwargs):
log.debug('Calling %s@%s with args:%r', self.url, name, args)
return RemoteRepo._call(self, name, *args, **kwargs)
def __getitem__(self, key):
return self.revision(key)
def _create_vcs_cache_context(self):
"""
Creates a unique string which is passed to the VCSServer on every
remote call. It is used as cache key in the VCSServer.
"""
return str(uuid.uuid4())
def invalidate_vcs_cache(self):
"""
This invalidates the context which is sent to the VCSServer on every
call to a remote method. It forces the VCSServer to create a fresh
repository instance on the next call to a remote method.
"""
self._wire['context'] = self._create_vcs_cache_context()
class RemoteObject(object):
def __init__(self, url, session):
self._url = url
self._session = session
# johbo: Trading complexity for performance. Avoiding the call to
# log.debug brings a few percent gain even if is is not active.
if log.isEnabledFor(logging.DEBUG):
self._call = self._call_with_logging
def __getattr__(self, name):
def f(*args, **kwargs):
return self._call(name, *args, **kwargs)
return f
@exceptions.map_vcs_exceptions
def _call(self, name, *args, **kwargs):
payload = {
'id': str(uuid.uuid4()),
'method': name,
'params': {'args': args, 'kwargs': kwargs}
}
return _remote_call(self._url, payload, EXCEPTIONS_MAP, self._session)
def _call_with_logging(self, name, *args, **kwargs):
log.debug('Calling %s@%s', self._url, name)
return RemoteObject._call(self, name, *args, **kwargs)
def _remote_call(url, payload, exceptions_map, session):
try:
response = session.post(url, data=msgpack.packb(payload))
except pycurl.error as e:
raise exceptions.HttpVCSCommunicationError(e)
if response.status_code >= 400:
log.error('Call to %s returned non 200 HTTP code: %s',
url, response.status_code)
raise exceptions.HttpVCSCommunicationError(repr(response.content))
try:
response = msgpack.unpackb(response.content)
except Exception:
log.exception('Failed to decode response %r', response.content)
raise
error = response.get('error')
if error:
type_ = error.get('type', 'Exception')
exc = exceptions_map.get(type_, Exception)
exc = exc(error.get('message'))
try:
exc._vcs_kind = error['_vcs_kind']
except KeyError:
pass
try:
exc._vcs_server_traceback = error['traceback']
except KeyError:
pass
raise exc
return response.get('result')
class VcsHttpProxy(object):
CHUNK_SIZE = 16384
def __init__(self, server_and_port, backend_endpoint):
adapter = requests.adapters.HTTPAdapter(max_retries=5)
self.base_url = urlparse.urljoin(
'http://%s' % server_and_port, backend_endpoint)
self.session = requests.Session()
self.session.mount('http://', adapter)
def handle(self, environment, input_data, *args, **kwargs):
data = {
'environment': environment,
'input_data': input_data,
'args': args,
'kwargs': kwargs
}
result = self.session.post(
self.base_url, msgpack.packb(data), stream=True)
return self._get_result(result)
def _deserialize_and_raise(self, error):
exception = Exception(error['message'])
try:
exception._vcs_kind = error['_vcs_kind']
except KeyError:
pass
raise exception
def _iterate(self, result):
unpacker = msgpack.Unpacker()
for line in result.iter_content(chunk_size=self.CHUNK_SIZE):
unpacker.feed(line)
for chunk in unpacker:
yield chunk
def _get_result(self, result):
iterator = self._iterate(result)
error = iterator.next()
if error:
self._deserialize_and_raise(error)
status = iterator.next()
headers = iterator.next()
return iterator, status, headers
class ThreadlocalSessionFactory(object):
"""
Creates one CurlSession per thread on demand.
"""
def __init__(self):
self._thread_local = threading.local()
def __call__(self):
if not hasattr(self._thread_local, 'curl_session'):
self._thread_local.curl_session = CurlSession()
return self._thread_local.curl_session