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# Copyright 2011-2012 Canonical Ltd.
#
# This file is part of u1db.
#
# u1db is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# u1db 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with u1db. If not, see <http://www.gnu.org/licenses/>.
"""SyncTarget API implementation to a remote HTTP server."""
try:
import simplejson as json
except ImportError:
import json # noqa
from u1db import (
Document,
SyncTarget,
)
from u1db.errors import (
BrokenSyncStream,
)
from u1db.remote import (
http_client,
utils,
)
class HTTPSyncTarget(http_client.HTTPClientBase, SyncTarget):
"""Implement the SyncTarget api to a remote HTTP server."""
@staticmethod
def connect(url):
return HTTPSyncTarget(url)
def get_sync_info(self, source_replica_uid):
self._ensure_connection()
res, _ = self._request_json('GET', ['sync-from', source_replica_uid])
return (res['target_replica_uid'], res['target_replica_generation'],
res['target_replica_transaction_id'],
res['source_replica_generation'], res['source_transaction_id'])
def record_sync_info(self, source_replica_uid, source_replica_generation,
source_transaction_id):
self._ensure_connection()
if self._trace_hook: # for tests
self._trace_hook('record_sync_info')
self._request_json('PUT', ['sync-from', source_replica_uid], {},
{'generation': source_replica_generation,
'transaction_id': source_transaction_id})
def _parse_sync_stream(self, data, return_doc_cb, ensure_callback=None):
parts = data.splitlines() # one at a time
if not parts or parts[0] != '[':
raise BrokenSyncStream
data = parts[1:-1]
comma = False
if data:
line, comma = utils.check_and_strip_comma(data[0])
res = json.loads(line)
if ensure_callback and 'replica_uid' in res:
ensure_callback(res['replica_uid'])
for entry in data[1:]:
if not comma: # missing in between comma
raise BrokenSyncStream
line, comma = utils.check_and_strip_comma(entry)
entry = json.loads(line)
doc = Document(entry['id'], entry['rev'], entry['content'])
return_doc_cb(doc, entry['gen'], entry['trans_id'])
if parts[-1] != ']':
try:
partdic = json.loads(parts[-1])
except ValueError:
pass
else:
if isinstance(partdic, dict):
self._error(partdic)
raise BrokenSyncStream
if not data or comma: # no entries or bad extra comma
raise BrokenSyncStream
return res
def sync_exchange(self, docs_by_generations, source_replica_uid,
last_known_generation, last_known_trans_id,
return_doc_cb, ensure_callback=None):
self._ensure_connection()
if self._trace_hook: # for tests
self._trace_hook('sync_exchange')
url = '%s/sync-from/%s' % (self._url.path, source_replica_uid)
self._conn.putrequest('POST', url)
self._conn.putheader('content-type', 'application/x-u1db-sync-stream')
for header_name, header_value in self._sign_request('POST', url, {}):
self._conn.putheader(header_name, header_value)
entries = ['[']
size = 1
def prepare(**dic):
entry = comma + '\r\n' + json.dumps(dic)
entries.append(entry)
return len(entry)
comma = ''
size += prepare(
last_known_generation=last_known_generation,
last_known_trans_id=last_known_trans_id,
ensure=ensure_callback is not None)
comma = ','
for doc, gen, trans_id in docs_by_generations:
size += prepare(id=doc.doc_id, rev=doc.rev, content=doc.get_json(),
gen=gen, trans_id=trans_id)
entries.append('\r\n]')
size += len(entries[-1])
self._conn.putheader('content-length', str(size))
self._conn.endheaders()
for entry in entries:
self._conn.send(entry)
entries = None
data, _ = self._response()
res = self._parse_sync_stream(data, return_doc_cb, ensure_callback)
data = None
return res['new_generation'], res['new_transaction_id']
# for tests
_trace_hook = None
def _set_trace_hook_shallow(self, cb):
self._trace_hook = cb
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