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authordrebs <drebs@leap.se>2012-12-10 12:05:31 -0200
committerdrebs <drebs@leap.se>2012-12-10 12:05:31 -0200
commitddd41a0c4bbe70cfca3827b93ac7f35b28c49400 (patch)
treeb06d3aae4ea943ecbb6ef5e4dce937b64bd9cc6c /backends/couchdb.py
parentded8b721def13751fe0b27e50ab1a3cb999fb292 (diff)
Add CouchDB u1db backend.
Diffstat (limited to 'backends/couchdb.py')
-rw-r--r--backends/couchdb.py97
1 files changed, 97 insertions, 0 deletions
diff --git a/backends/couchdb.py b/backends/couchdb.py
new file mode 100644
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+++ b/backends/couchdb.py
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+from u1db import errors
+from u1db.remote.http_target import HTTPSyncTarget
+from couchdb import *
+from soledad.backends.objectstore import ObjectStore
+
+
+class CouchDatabase(ObjectStore):
+ """A U1DB implementation that uses Couch as its persistence layer."""
+
+ def __init__(self, url, database, full_commit=True, session=None):
+ """Create a new Couch data container."""
+ self._url = url
+ self._full_commit = full_commit
+ self._session = session
+ self._server = couchdb.Server(url=self._url,
+ full_commit=self._full_commit,
+ session=self._session)
+ # this will ensure that transaction and sync logs exist and are
+ # up-to-date.
+ super(CouchDatabase, self)
+ self._database = self._server[database]
+
+ #-------------------------------------------------------------------------
+ # implemented methods from Database
+ #-------------------------------------------------------------------------
+
+ def _get_doc(self, doc_id, check_for_conflicts=False):
+ """Get just the document content, without fancy handling.
+
+ Conflicts do not happen on server side, so there's no need to check
+ for them.
+ """
+ cdoc = self._database.get(doc_id)
+ if cdoc is not None:
+ content = {}
+ for key, value in content:
+ if not key in ['_id', '_rev', '_u1db_rev']:
+ content[key] = value
+ doc = self._factory(doc_id=doc_id, rev=cdoc['_u1db_rev'])
+ doc.content = content
+ 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:
+ doc = self._get_doc(doc_id)
+ if doc.content is None and not include_deleted:
+ continue
+ results.append(doc)
+ return (generation, results)
+
+ def _put_doc(self, doc, new_rev):
+ # map u1db metadata to couch
+ content = doc.content
+ content['_id'] = doc.doc_id
+ content['_u1db_rev'] = new_rev
+ self._database.save(doc.content)
+
+ def get_sync_target(self):
+ return CouchSyncTarget(self)
+
+ def close(self):
+ raise NotImplementedError(self.close)
+
+ def sync(self, url, creds=None, autocreate=True):
+ from u1db.sync import Synchronizer
+ from u1db.remote.http_target import CouchSyncTarget
+ return Synchronizer(self, CouchSyncTarget(url, creds=creds)).sync(
+ autocreate=autocreate)
+
+ #-------------------------------------------------------------------------
+ # Couch specific methods
+ #-------------------------------------------------------------------------
+
+ # no specific methods so far.
+
+class CouchSyncTarget(HTTPSyncTarget):
+
+ 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)
+
+