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import sys
import uuid
from base64 import b64encode, b64decode
from u1db import errors
from u1db.sync import LocalSyncTarget
from couchdb.client import Server, Document as CouchDocument
from couchdb.http import ResourceNotFound
from leap.soledad.backends.objectstore import ObjectStore
from leap.soledad.backends.leap_backend import LeapDocument
try:
import simplejson as json
except ImportError:
import json # noqa
class CouchDatabase(ObjectStore):
"""A U1DB implementation that uses Couch as its persistence layer."""
def __init__(self, url, database, replica_uid=None, full_commit=True, session=None):
"""Create a new Couch data container."""
self._url = url
self._full_commit = full_commit
self._session = session
self._server = Server(url=self._url,
full_commit=self._full_commit,
session=self._session)
self._dbname = database
# this will ensure that transaction and sync logs exist and are
# up-to-date.
self.set_document_factory(LeapDocument)
try:
self._database = self._server[database]
except ResourceNotFound:
self._server.create(database)
self._database = self._server[database]
super(CouchDatabase, self).__init__(replica_uid=replica_uid)
#-------------------------------------------------------------------------
# implemented methods from Database
#-------------------------------------------------------------------------
def _get_doc(self, doc_id, check_for_conflicts=False):
"""
Get just the document content, without fancy handling.
"""
cdoc = self._database.get(doc_id)
if cdoc is None:
return None
has_conflicts = False
if check_for_conflicts:
has_conflicts = self._has_conflicts(doc_id)
doc = self._factory(
doc_id=doc_id,
rev=cdoc['u1db_rev'],
has_conflicts=has_conflicts)
if cdoc['u1db_json'] is not None:
doc.content = json.loads(cdoc['u1db_json'])
else:
doc.make_tombstone()
return doc
def get_all_docs(self, include_deleted=False):
"""Get all documents from the database."""
generation = self._get_generation()
results = []
for doc_id in self._database:
if doc_id == self.U1DB_DATA_DOC_ID:
continue
doc = self._get_doc(doc_id, check_for_conflicts=True)
if doc.content is None and not include_deleted:
continue
results.append(doc)
return (generation, results)
def _put_doc(self, doc):
# prepare couch's Document
cdoc = CouchDocument()
cdoc['_id'] = doc.doc_id
# we have to guarantee that couch's _rev is cosistent
old_cdoc = self._database.get(doc.doc_id)
if old_cdoc is not None:
cdoc['_rev'] = old_cdoc['_rev']
# store u1db's rev
cdoc['u1db_rev'] = doc.rev
# store u1db's content as json string
if not doc.is_tombstone():
cdoc['u1db_json'] = doc.get_json()
else:
cdoc['u1db_json'] = None
# save doc in db
self._database.save(cdoc)
def get_sync_target(self):
return CouchSyncTarget(self)
def close(self):
# TODO: fix this method so the connection is properly closed and
# test_close (+tearDown, which deletes the db) works without problems.
self._url = None
self._full_commit = None
self._session = None
#self._server = None
self._database = None
return True
def sync(self, url, creds=None, autocreate=True):
from u1db.sync import Synchronizer
return Synchronizer(self, CouchSyncTarget(url, creds=creds)).sync(
autocreate=autocreate)
def _initialize(self):
if self._replica_uid is None:
self._replica_uid = uuid.uuid4().hex
doc = self._factory(doc_id=self.U1DB_DATA_DOC_ID)
doc.content = { 'sync_log' : [],
'transaction_log' : [],
'conflict_log' : b64encode(json.dumps([])),
'replica_uid' : self._replica_uid }
self._put_doc(doc)
def _get_u1db_data(self):
cdoc = self._database.get(self.U1DB_DATA_DOC_ID)
content = json.loads(cdoc['u1db_json'])
self._sync_log.log = content['sync_log']
self._transaction_log.log = content['transaction_log']
self._conflict_log.log = json.loads(b64decode(content['conflict_log']))
self._replica_uid = content['replica_uid']
self._couch_rev = cdoc['_rev']
def _set_u1db_data(self):
doc = self._factory(doc_id=self.U1DB_DATA_DOC_ID)
doc.content = { 'sync_log' : self._sync_log.log,
'transaction_log' : self._transaction_log.log,
# Here, the b64 encode ensures that document content
# does not cause strange behaviour in couchdb because
# of encoding.
'conflict_log' : b64encode(json.dumps(self._conflict_log.log)),
'replica_uid' : self._replica_uid,
'_rev' : self._couch_rev}
self._put_doc(doc)
#-------------------------------------------------------------------------
# Couch specific methods
#-------------------------------------------------------------------------
def delete_database(self):
del(self._server[self._dbname])
class CouchSyncTarget(LocalSyncTarget):
def get_sync_info(self, source_replica_uid):
source_gen, source_trans_id = self._db._get_replica_gen_and_trans_id(
source_replica_uid)
my_gen, my_trans_id = self._db._get_generation_info()
return (
self._db._replica_uid, my_gen, my_trans_id, source_gen,
source_trans_id)
def record_sync_info(self, source_replica_uid, source_replica_generation,
source_replica_transaction_id):
if self._trace_hook:
self._trace_hook('record_sync_info')
self._db._set_replica_gen_and_trans_id(
source_replica_uid, source_replica_generation,
source_replica_transaction_id)
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