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authordrebs <drebs@leap.se>2016-07-29 10:01:46 -0300
committerdrebs <drebs@leap.se>2016-08-01 21:09:04 -0300
commitbc28ea6e652418791dcf63fadcc81db9c50e2d45 (patch)
tree8ee54c15dc636c4ab347b5387ea3da268ebf7259 /scripts/migration/0.8.2/migrate_couch_schema
parent72ee56e3863729b148cf8cc16e4004dc7b52acdd (diff)
[pkg] add couch schema migration script
Diffstat (limited to 'scripts/migration/0.8.2/migrate_couch_schema')
-rw-r--r--scripts/migration/0.8.2/migrate_couch_schema/__init__.py142
1 files changed, 142 insertions, 0 deletions
diff --git a/scripts/migration/0.8.2/migrate_couch_schema/__init__.py b/scripts/migration/0.8.2/migrate_couch_schema/__init__.py
new file mode 100644
index 00000000..37e5a525
--- /dev/null
+++ b/scripts/migration/0.8.2/migrate_couch_schema/__init__.py
@@ -0,0 +1,142 @@
+# __init__.py
+"""
+Support functions for migration script.
+"""
+
+import logging
+
+from couchdb import Server
+
+from leap.soledad.common.couch import GENERATION_KEY
+from leap.soledad.common.couch import TRANSACTION_ID_KEY
+from leap.soledad.common.couch import REPLICA_UID_KEY
+from leap.soledad.common.couch import DOC_ID_KEY
+from leap.soledad.common.couch import SCHEMA_VERSION_KEY
+from leap.soledad.common.couch import CONFIG_DOC_ID
+from leap.soledad.common.couch import SYNC_DOC_ID_PREFIX
+from leap.soledad.common.couch import SCHEMA_VERSION
+
+
+logger = logging.getLogger(__name__)
+
+
+#
+# support functions
+#
+
+def _get_couch_server(couch_url):
+ return Server(couch_url)
+
+
+def _is_migrateable(db):
+ config_doc = db.get('u1db_config')
+ if config_doc is None:
+ return False
+ return True
+
+
+def _get_transaction_log(db):
+ ddoc_path = ['_design', 'transactions', '_view', 'log']
+ resource = db.resource(*ddoc_path)
+ _, _, data = resource.get_json()
+ rows = data['rows']
+ transaction_log = []
+ gen = 1
+ for row in rows:
+ transaction_log.append((gen, row['id'], row['value']))
+ gen += 1
+ return transaction_log
+
+
+def _get_user_dbs(server):
+ user_dbs = filter(lambda dbname: dbname.startswith('user-'), server)
+ return user_dbs
+
+
+#
+# migration main functions
+#
+
+def migrate(args, target_version):
+ server = _get_couch_server(args.couch_url)
+ logger.info('starting couch schema migration to %s...' % target_version)
+ if not args.do_migrate:
+ logger.warning('dry-run: no changes will be made to databases')
+ user_dbs = _get_user_dbs(server)
+ for dbname in user_dbs:
+ db = server[dbname]
+ if not _is_migrateable(db):
+ logger.warning("skipping user db: %s" % dbname)
+ continue
+ logger.info("starting migration of user db: %s" % dbname)
+ _migrate_user_db(db, args.do_migrate)
+ logger.info("finished migration of user db: %s" % dbname)
+ logger.info('finished couch schema migration to %s' % target_version)
+
+
+def _migrate_user_db(db, do_migrate):
+ _migrate_transaction_log(db, do_migrate)
+ _migrate_config_doc(db, do_migrate)
+ _migrate_sync_docs(db, do_migrate)
+ _delete_design_docs(db, do_migrate)
+
+
+def _migrate_transaction_log(db, do_migrate):
+ transaction_log = _get_transaction_log(db)
+ for gen, doc_id, trans_id in transaction_log:
+ gen_doc_id = 'gen-%s' % str(gen).zfill(10)
+ doc = {
+ '_id': gen_doc_id,
+ GENERATION_KEY: gen,
+ DOC_ID_KEY: doc_id,
+ TRANSACTION_ID_KEY: trans_id,
+ }
+ logger.info('creating gen doc: %s' % (gen_doc_id))
+ if do_migrate:
+ db.save(doc)
+
+
+def _migrate_config_doc(db, do_migrate):
+ old_doc = db['u1db_config']
+ new_doc = {
+ '_id': CONFIG_DOC_ID,
+ REPLICA_UID_KEY: old_doc[REPLICA_UID_KEY],
+ SCHEMA_VERSION_KEY: SCHEMA_VERSION,
+ }
+ logger.info("moving config doc: %s -> %s"
+ % (old_doc['_id'], new_doc['_id']))
+ if do_migrate:
+ db.save(new_doc)
+ db.delete(old_doc)
+
+
+def _migrate_sync_docs(db, do_migrate):
+ view = db.view(
+ '_all_docs',
+ startkey='u1db_sync',
+ endkey='u1db_synd',
+ include_docs='true')
+ for row in view.rows:
+ old_doc = row['doc']
+ old_id = old_doc['_id']
+ replica_uid = old_id.replace('u1db_sync_', '')
+ new_id = "%s%s" % (SYNC_DOC_ID_PREFIX, replica_uid)
+ new_doc = {
+ '_id': new_id,
+ GENERATION_KEY: old_doc['generation'],
+ TRANSACTION_ID_KEY: old_doc['transaction_id'],
+ REPLICA_UID_KEY: replica_uid,
+ }
+ logger.info("moving sync doc: %s -> %s" % (old_id, new_id))
+ if do_migrate:
+ db.save(new_doc)
+ db.delete(old_doc)
+
+
+def _delete_design_docs(db, do_migrate):
+ for ddoc in ['docs', 'syncs', 'transactions']:
+ doc_id = '_design/%s' % ddoc
+ doc = db.get(doc_id)
+ logger.info("deleting design doc: %s" % doc_id)
+ if do_migrate:
+ db.delete(doc)