[refactor] make u1db connection pool args explicit

1 files changed, 730 insertions, 0 deletions

diff --git a/testing/tests/sync/test_sqlcipher_sync.py b/testing/tests/sync/test_sqlcipher_sync.py
new file mode 100644
index 00000000..3cbefc8b
--- /dev/null
+++ b/testing/tests/sync/test_sqlcipher_sync.py
@@ -0,0 +1,730 @@
+# -*- coding: utf-8 -*-
+# test_sqlcipher.py
+# Copyright (C) 2013-2016 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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 General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+"""
+Test sqlcipher backend sync.
+"""
+import os
+
+from uuid import uuid4
+
+from testscenarios import TestWithScenarios
+
+from leap.soledad.common.l2db import sync
+from leap.soledad.common.l2db import vectorclock
+from leap.soledad.common.l2db import errors
+
+from leap.soledad.common.crypto import ENC_SCHEME_KEY
+from leap.soledad.client.crypto import decrypt_doc_dict
+from leap.soledad.client.http_target import SoledadHTTPSyncTarget
+
+from test_soledad import u1db_tests as tests
+from test_soledad.util import SQLCIPHER_SCENARIOS
+from test_soledad.util import make_soledad_app
+from test_soledad.util import soledad_sync_target
+from test_soledad.util import BaseSoledadTest
+
+
+# -----------------------------------------------------------------------------
+# The following tests come from `u1db.tests.test_sync`.
+# -----------------------------------------------------------------------------
+
+def sync_via_synchronizer_and_soledad(test, db_source, db_target,
+                                      trace_hook=None,
+                                      trace_hook_shallow=None):
+    if trace_hook:
+        test.skipTest("full trace hook unsupported over http")
+    path = test._http_at[db_target]
+    target = SoledadHTTPSyncTarget.connect(
+        test.getURL(path), test._soledad._crypto)
+    target.set_token_credentials('user-uuid', 'auth-token')
+    if trace_hook_shallow:
+        target._set_trace_hook_shallow(trace_hook_shallow)
+    return sync.Synchronizer(db_source, target).sync()
+
+
+def sync_via_synchronizer(test, db_source, db_target,
+                          trace_hook=None,
+                          trace_hook_shallow=None):
+    target = db_target.get_sync_target()
+    trace_hook = trace_hook or trace_hook_shallow
+    if trace_hook:
+        target._set_trace_hook(trace_hook)
+    return sync.Synchronizer(db_source, target).sync()
+
+
+sync_scenarios = []
+for name, scenario in SQLCIPHER_SCENARIOS:
+    scenario['do_sync'] = sync_via_synchronizer
+    sync_scenarios.append((name, scenario))
+
+
+class SQLCipherDatabaseSyncTests(
+        TestWithScenarios,
+        tests.DatabaseBaseTests,
+        BaseSoledadTest):
+
+    """
+    Test for succesfull sync between SQLCipher and LeapBackend.
+
+    Some of the tests in this class had to be adapted because the remote
+    backend always receive encrypted content, and so it can not rely on
+    document's content comparison to try to autoresolve conflicts.
+    """
+
+    scenarios = sync_scenarios
+
+    def setUp(self):
+        self._use_tracking = {}
+        super(tests.DatabaseBaseTests, self).setUp()
+
+    def create_database(self, replica_uid, sync_role=None):
+        if replica_uid == 'test' and sync_role is None:
+            # created up the chain by base class but unused
+            return None
+        db = self.create_database_for_role(replica_uid, sync_role)
+        if sync_role:
+            self._use_tracking[db] = (replica_uid, sync_role)
+        self.addCleanup(db.close)
+        return db
+
+    def create_database_for_role(self, replica_uid, sync_role):
+        # hook point for reuse
+        return tests.DatabaseBaseTests.create_database(self, replica_uid)
+
+    def sync(self, db_from, db_to, trace_hook=None,
+             trace_hook_shallow=None):
+        from_name, from_sync_role = self._use_tracking[db_from]
+        to_name, to_sync_role = self._use_tracking[db_to]
+        if from_sync_role not in ('source', 'both'):
+            raise Exception("%s marked for %s use but used as source" %
+                            (from_name, from_sync_role))
+        if to_sync_role not in ('target', 'both'):
+            raise Exception("%s marked for %s use but used as target" %
+                            (to_name, to_sync_role))
+        return self.do_sync(self, db_from, db_to, trace_hook,
+                            trace_hook_shallow)
+
+    def assertLastExchangeLog(self, db, expected):
+        log = getattr(db, '_last_exchange_log', None)
+        if log is None:
+            return
+        self.assertEqual(expected, log)
+
+    def copy_database(self, db, sync_role=None):
+        # DO NOT COPY OR REUSE THIS CODE OUTSIDE TESTS: COPYING U1DB DATABASES
+        # IS THE WRONG THING TO DO, THE ONLY REASON WE DO SO HERE IS TO TEST
+        # THAT WE CORRECTLY DETECT IT HAPPENING SO THAT WE CAN RAISE ERRORS
+        # RATHER THAN CORRUPT USER DATA. USE SYNC INSTEAD, OR WE WILL SEND
+        # NINJA TO YOUR HOUSE.
+        db_copy = tests.DatabaseBaseTests.copy_database(self, db)
+        name, orig_sync_role = self._use_tracking[db]
+        self._use_tracking[db_copy] = (name + '(copy)', sync_role or
+                                       orig_sync_role)
+        return db_copy
+
+    def test_sync_tracks_db_generation_of_other(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.assertEqual(0, self.sync(self.db1, self.db2))
+        self.assertEqual(
+            (0, ''), self.db1._get_replica_gen_and_trans_id('test2'))
+        self.assertEqual(
+            (0, ''), self.db2._get_replica_gen_and_trans_id('test1'))
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [], 'last_known_gen': 0},
+                                    'return':
+                                       {'docs': [], 'last_gen': 0}})
+
+    def test_sync_autoresolves(self):
+        """
+        Test for sync autoresolve remote.
+
+        This test was adapted because the remote database receives encrypted
+        content and so it can't compare documents contents to autoresolve.
+        """
+        # The remote database can't autoresolve conflicts based on magic
+        # content convergence, so we modify this test to leave the possibility
+        # of the remode document ending up in conflicted state.
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc1 = self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc')
+        rev1 = doc1.rev
+        doc2 = self.db2.create_doc_from_json(tests.simple_doc, doc_id='doc')
+        rev2 = doc2.rev
+        self.sync(self.db1, self.db2)
+        doc = self.db1.get_doc('doc')
+        self.assertFalse(doc.has_conflicts)
+        # if remote content is in conflicted state, then document revisions
+        # will be different.
+        # self.assertEqual(doc.rev, self.db2.get_doc('doc').rev)
+        v = vectorclock.VectorClockRev(doc.rev)
+        self.assertTrue(v.is_newer(vectorclock.VectorClockRev(rev1)))
+        self.assertTrue(v.is_newer(vectorclock.VectorClockRev(rev2)))
+
+    def test_sync_autoresolves_moar(self):
+        """
+        Test for sync autoresolve local.
+
+        This test was adapted to decrypt remote content before assert.
+        """
+        # here we test that when a database that has a conflicted document is
+        # the source of a sync, and the target database has a revision of the
+        # conflicted document that is newer than the source database's, and
+        # that target's database's document's content is the same as the
+        # source's document's conflict's, the source's document's conflict gets
+        # autoresolved, and the source's document's revision bumped.
+        #
+        # idea is as follows:
+        # A          B
+        # a1         -
+        #   `------->
+        # a1         a1
+        # v          v
+        # a2         a1b1
+        #   `------->
+        # a1b1+a2    a1b1
+        #            v
+        # a1b1+a2    a1b2 (a1b2 has same content as a2)
+        #   `------->
+        # a3b2       a1b2 (autoresolved)
+        #   `------->
+        # a3b2       a3b2
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc')
+        self.sync(self.db1, self.db2)
+        for db, content in [(self.db1, '{}'), (self.db2, '{"hi": 42}')]:
+            doc = db.get_doc('doc')
+            doc.set_json(content)
+            db.put_doc(doc)
+        self.sync(self.db1, self.db2)
+        # db1 and db2 now both have a doc of {hi:42}, but db1 has a conflict
+        doc = self.db1.get_doc('doc')
+        rev1 = doc.rev
+        self.assertTrue(doc.has_conflicts)
+        # set db2 to have a doc of {} (same as db1 before the conflict)
+        doc = self.db2.get_doc('doc')
+        doc.set_json('{}')
+        self.db2.put_doc(doc)
+        rev2 = doc.rev
+        # sync it across
+        self.sync(self.db1, self.db2)
+        # tadaa!
+        doc = self.db1.get_doc('doc')
+        self.assertFalse(doc.has_conflicts)
+        vec1 = vectorclock.VectorClockRev(rev1)
+        vec2 = vectorclock.VectorClockRev(rev2)
+        vec3 = vectorclock.VectorClockRev(doc.rev)
+        self.assertTrue(vec3.is_newer(vec1))
+        self.assertTrue(vec3.is_newer(vec2))
+        # because the conflict is on the source, sync it another time
+        self.sync(self.db1, self.db2)
+        # make sure db2 now has the exact same thing
+        doc1 = self.db1.get_doc('doc')
+        self.assertGetEncryptedDoc(
+            self.db2,
+            doc1.doc_id, doc1.rev, doc1.get_json(), False)
+
+    def test_sync_autoresolves_moar_backwards(self):
+        # here we would test that when a database that has a conflicted
+        # document is the target of a sync, and the source database has a
+        # revision of the conflicted document that is newer than the target
+        # database's, and that source's database's document's content is the
+        # same as the target's document's conflict's, the target's document's
+        # conflict gets autoresolved, and the document's revision bumped.
+        #
+        # Despite that, in Soledad we suppose that the server never syncs, so
+        # it never has conflicted documents. Also, if it had, convergence
+        # would not be possible by checking document's contents because they
+        # would be encrypted in server.
+        #
+        # Therefore we suppress this test.
+        pass
+
+    def test_sync_autoresolves_moar_backwards_three(self):
+        # here we would test that when a database that has a conflicted
+        # document is the target of a sync, and the source database has a
+        # revision of the conflicted document that is newer than the target
+        # database's, and that source's database's document's content is the
+        # same as the target's document's conflict's, the target's document's
+        # conflict gets autoresolved, and the document's revision bumped.
+        #
+        # We use the same reasoning from the last test to suppress this one.
+        pass
+
+    def test_sync_pulling_doesnt_update_other_if_changed(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc = self.db2.create_doc_from_json(tests.simple_doc)
+        # After the local side has sent its list of docs, before we start
+        # receiving the "targets" response, we update the local database with a
+        # new record.
+        # When we finish synchronizing, we can notice that something locally
+        # was updated, and we cannot tell c2 our new updated generation
+
+        def before_get_docs(state):
+            if state != 'before get_docs':
+                return
+            self.db1.create_doc_from_json(tests.simple_doc)
+
+        self.assertEqual(0, self.sync(self.db1, self.db2,
+                                      trace_hook=before_get_docs))
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [], 'last_known_gen': 0},
+                                    'return':
+                                       {'docs': [(doc.doc_id, doc.rev)],
+                                        'last_gen': 1}})
+        self.assertEqual(1, self.db1._get_replica_gen_and_trans_id('test2')[0])
+        # c2 should not have gotten a '_record_sync_info' call, because the
+        # local database had been updated more than just by the messages
+        # returned from c2.
+        self.assertEqual(
+            (0, ''), self.db2._get_replica_gen_and_trans_id('test1'))
+
+    def test_sync_doesnt_update_other_if_nothing_pulled(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc)
+
+        def no_record_sync_info(state):
+            if state != 'record_sync_info':
+                return
+            self.fail('SyncTarget.record_sync_info was called')
+        self.assertEqual(1, self.sync(self.db1, self.db2,
+                                      trace_hook_shallow=no_record_sync_info))
+        self.assertEqual(
+            1,
+            self.db2._get_replica_gen_and_trans_id(self.db1._replica_uid)[0])
+
+    def test_sync_ignores_convergence(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'both')
+        doc = self.db1.create_doc_from_json(tests.simple_doc)
+        self.db3 = self.create_database('test3', 'target')
+        self.assertEqual(1, self.sync(self.db1, self.db3))
+        self.assertEqual(0, self.sync(self.db2, self.db3))
+        self.assertEqual(1, self.sync(self.db1, self.db2))
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [(doc.doc_id, doc.rev)],
+                                        'source_uid': 'test1',
+                                        'source_gen': 1, 'last_known_gen': 0},
+                                    'return': {'docs': [], 'last_gen': 1}})
+
+    def test_sync_ignores_superseded(self):
+        self.db1 = self.create_database('test1', 'both')
+        self.db2 = self.create_database('test2', 'both')
+        doc = self.db1.create_doc_from_json(tests.simple_doc)
+        doc_rev1 = doc.rev
+        self.db3 = self.create_database('test3', 'target')
+        self.sync(self.db1, self.db3)
+        self.sync(self.db2, self.db3)
+        new_content = '{"key": "altval"}'
+        doc.set_json(new_content)
+        self.db1.put_doc(doc)
+        doc_rev2 = doc.rev
+        self.sync(self.db2, self.db1)
+        self.assertLastExchangeLog(self.db1,
+                                   {'receive':
+                                       {'docs': [(doc.doc_id, doc_rev1)],
+                                        'source_uid': 'test2',
+                                        'source_gen': 1, 'last_known_gen': 0},
+                                    'return':
+                                       {'docs': [(doc.doc_id, doc_rev2)],
+                                        'last_gen': 2}})
+        self.assertGetDoc(self.db1, doc.doc_id, doc_rev2, new_content, False)
+
+    def test_sync_sees_remote_conflicted(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc1 = self.db1.create_doc_from_json(tests.simple_doc)
+        doc_id = doc1.doc_id
+        doc1_rev = doc1.rev
+        self.db1.create_index('test-idx', 'key')
+        new_doc = '{"key": "altval"}'
+        doc2 = self.db2.create_doc_from_json(new_doc, doc_id=doc_id)
+        doc2_rev = doc2.rev
+        self.assertTransactionLog([doc1.doc_id], self.db1)
+        self.sync(self.db1, self.db2)
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [(doc_id, doc1_rev)],
+                                        'source_uid': 'test1',
+                                        'source_gen': 1, 'last_known_gen': 0},
+                                    'return':
+                                       {'docs': [(doc_id, doc2_rev)],
+                                        'last_gen': 1}})
+        self.assertTransactionLog([doc_id, doc_id], self.db1)
+        self.assertGetDoc(self.db1, doc_id, doc2_rev, new_doc, True)
+        self.assertGetDoc(self.db2, doc_id, doc2_rev, new_doc, False)
+        from_idx = self.db1.get_from_index('test-idx', 'altval')[0]
+        self.assertEqual(doc2.doc_id, from_idx.doc_id)
+        self.assertEqual(doc2.rev, from_idx.rev)
+        self.assertTrue(from_idx.has_conflicts)
+        self.assertEqual([], self.db1.get_from_index('test-idx', 'value'))
+
+    def test_sync_sees_remote_delete_conflicted(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc1 = self.db1.create_doc_from_json(tests.simple_doc)
+        doc_id = doc1.doc_id
+        self.db1.create_index('test-idx', 'key')
+        self.sync(self.db1, self.db2)
+        doc2 = self.make_document(doc1.doc_id, doc1.rev, doc1.get_json())
+        new_doc = '{"key": "altval"}'
+        doc1.set_json(new_doc)
+        self.db1.put_doc(doc1)
+        self.db2.delete_doc(doc2)
+        self.assertTransactionLog([doc_id, doc_id], self.db1)
+        self.sync(self.db1, self.db2)
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [(doc_id, doc1.rev)],
+                                        'source_uid': 'test1',
+                                        'source_gen': 2, 'last_known_gen': 1},
+                                    'return': {'docs': [(doc_id, doc2.rev)],
+                                               'last_gen': 2}})
+        self.assertTransactionLog([doc_id, doc_id, doc_id], self.db1)
+        self.assertGetDocIncludeDeleted(self.db1, doc_id, doc2.rev, None, True)
+        self.assertGetDocIncludeDeleted(
+            self.db2, doc_id, doc2.rev, None, False)
+        self.assertEqual([], self.db1.get_from_index('test-idx', 'value'))
+
+    def test_sync_local_race_conflicted(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc = self.db1.create_doc_from_json(tests.simple_doc)
+        doc_id = doc.doc_id
+        doc1_rev = doc.rev
+        self.db1.create_index('test-idx', 'key')
+        self.sync(self.db1, self.db2)
+        content1 = '{"key": "localval"}'
+        content2 = '{"key": "altval"}'
+        doc.set_json(content2)
+        self.db2.put_doc(doc)
+        doc2_rev2 = doc.rev
+        triggered = []
+
+        def after_whatschanged(state):
+            if state != 'after whats_changed':
+                return
+            triggered.append(True)
+            doc = self.make_document(doc_id, doc1_rev, content1)
+            self.db1.put_doc(doc)
+
+        self.sync(self.db1, self.db2, trace_hook=after_whatschanged)
+        self.assertEqual([True], triggered)
+        self.assertGetDoc(self.db1, doc_id, doc2_rev2, content2, True)
+        from_idx = self.db1.get_from_index('test-idx', 'altval')[0]
+        self.assertEqual(doc.doc_id, from_idx.doc_id)
+        self.assertEqual(doc.rev, from_idx.rev)
+        self.assertTrue(from_idx.has_conflicts)
+        self.assertEqual([], self.db1.get_from_index('test-idx', 'value'))
+        self.assertEqual([], self.db1.get_from_index('test-idx', 'localval'))
+
+    def test_sync_propagates_deletes(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'both')
+        doc1 = self.db1.create_doc_from_json(tests.simple_doc)
+        doc_id = doc1.doc_id
+        self.db1.create_index('test-idx', 'key')
+        self.sync(self.db1, self.db2)
+        self.db2.create_index('test-idx', 'key')
+        self.db3 = self.create_database('test3', 'target')
+        self.sync(self.db1, self.db3)
+        self.db1.delete_doc(doc1)
+        deleted_rev = doc1.rev
+        self.sync(self.db1, self.db2)
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [(doc_id, deleted_rev)],
+                                        'source_uid': 'test1',
+                                        'source_gen': 2, 'last_known_gen': 1},
+                                    'return': {'docs': [], 'last_gen': 2}})
+        self.assertGetDocIncludeDeleted(
+            self.db1, doc_id, deleted_rev, None, False)
+        self.assertGetDocIncludeDeleted(
+            self.db2, doc_id, deleted_rev, None, False)
+        self.assertEqual([], self.db1.get_from_index('test-idx', 'value'))
+        self.assertEqual([], self.db2.get_from_index('test-idx', 'value'))
+        self.sync(self.db2, self.db3)
+        self.assertLastExchangeLog(self.db3,
+                                   {'receive':
+                                       {'docs': [(doc_id, deleted_rev)],
+                                        'source_uid': 'test2',
+                                        'source_gen': 2,
+                                        'last_known_gen': 0},
+                                    'return':
+                                       {'docs': [], 'last_gen': 2}})
+        self.assertGetDocIncludeDeleted(
+            self.db3, doc_id, deleted_rev, None, False)
+
+    def test_sync_propagates_deletes_2(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json('{"a": "1"}', doc_id='the-doc')
+        self.sync(self.db1, self.db2)
+        doc1_2 = self.db2.get_doc('the-doc')
+        self.db2.delete_doc(doc1_2)
+        self.sync(self.db1, self.db2)
+        self.assertGetDocIncludeDeleted(
+            self.db1, 'the-doc', doc1_2.rev, None, False)
+
+    def test_sync_detects_identical_replica_uid(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test1', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc1')
+        self.assertRaises(
+            errors.InvalidReplicaUID, self.sync, self.db1, self.db2)
+
+    def test_optional_sync_preserve_json(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        cont1 = '{  "a":  2  }'
+        cont2 = '{ "b":3}'
+        self.db1.create_doc_from_json(cont1, doc_id="1")
+        self.db2.create_doc_from_json(cont2, doc_id="2")
+        self.sync(self.db1, self.db2)
+        self.assertEqual(cont1, self.db2.get_doc("1").get_json())
+        self.assertEqual(cont2, self.db1.get_doc("2").get_json())
+
+    def test_sync_propagates_resolution(self):
+        """
+        Test if synchronization propagates resolution.
+
+        This test was adapted to decrypt remote content before assert.
+        """
+        self.db1 = self.create_database('test1', 'both')
+        self.db2 = self.create_database('test2', 'both')
+        doc1 = self.db1.create_doc_from_json('{"a": 1}', doc_id='the-doc')
+        db3 = self.create_database('test3', 'both')
+        self.sync(self.db2, self.db1)
+        self.assertEqual(
+            self.db1._get_generation_info(),
+            self.db2._get_replica_gen_and_trans_id(self.db1._replica_uid))
+        self.assertEqual(
+            self.db2._get_generation_info(),
+            self.db1._get_replica_gen_and_trans_id(self.db2._replica_uid))
+        self.sync(db3, self.db1)
+        # update on 2
+        doc2 = self.make_document('the-doc', doc1.rev, '{"a": 2}')
+        self.db2.put_doc(doc2)
+        self.sync(self.db2, db3)
+        self.assertEqual(db3.get_doc('the-doc').rev, doc2.rev)
+        # update on 1
+        doc1.set_json('{"a": 3}')
+        self.db1.put_doc(doc1)
+        # conflicts
+        self.sync(self.db2, self.db1)
+        self.sync(db3, self.db1)
+        self.assertTrue(self.db2.get_doc('the-doc').has_conflicts)
+        self.assertTrue(db3.get_doc('the-doc').has_conflicts)
+        # resolve
+        conflicts = self.db2.get_doc_conflicts('the-doc')
+        doc4 = self.make_document('the-doc', None, '{"a": 4}')
+        revs = [doc.rev for doc in conflicts]
+        self.db2.resolve_doc(doc4, revs)
+        doc2 = self.db2.get_doc('the-doc')
+        self.assertEqual(doc4.get_json(), doc2.get_json())
+        self.assertFalse(doc2.has_conflicts)
+        self.sync(self.db2, db3)
+        doc3 = db3.get_doc('the-doc')
+        if ENC_SCHEME_KEY in doc3.content:
+            _crypto = self._soledad._crypto
+            key = _crypto.doc_passphrase(doc3.doc_id)
+            secret = _crypto.secret
+            doc3.set_json(decrypt_doc_dict(
+                doc3.content,
+                doc3.doc_id, doc3.rev, key, secret))
+        self.assertEqual(doc4.get_json(), doc3.get_json())
+        self.assertFalse(doc3.has_conflicts)
+        self.db1.close()
+        self.db2.close()
+        db3.close()
+
+    def test_sync_puts_changes(self):
+        """
+        Test if sync puts changes in remote replica.
+
+        This test was adapted to decrypt remote content before assert.
+        """
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc = self.db1.create_doc_from_json(tests.simple_doc)
+        self.assertEqual(1, self.sync(self.db1, self.db2))
+        self.assertGetEncryptedDoc(
+            self.db2, doc.doc_id, doc.rev, tests.simple_doc, False)
+        self.assertEqual(1, self.db1._get_replica_gen_and_trans_id('test2')[0])
+        self.assertEqual(1, self.db2._get_replica_gen_and_trans_id('test1')[0])
+        self.assertLastExchangeLog(
+            self.db2,
+            {'receive': {'docs': [(doc.doc_id, doc.rev)],
+                         'source_uid': 'test1',
+                         'source_gen': 1, 'last_known_gen': 0},
+             'return': {'docs': [], 'last_gen': 1}})
+
+    def test_sync_pulls_changes(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        doc = self.db2.create_doc_from_json(tests.simple_doc)
+        self.db1.create_index('test-idx', 'key')
+        self.assertEqual(0, self.sync(self.db1, self.db2))
+        self.assertGetDoc(self.db1, doc.doc_id, doc.rev,
+                          tests.simple_doc, False)
+        self.assertEqual(1, self.db1._get_replica_gen_and_trans_id('test2')[0])
+        self.assertEqual(1, self.db2._get_replica_gen_and_trans_id('test1')[0])
+        self.assertLastExchangeLog(self.db2,
+                                   {'receive':
+                                       {'docs': [], 'last_known_gen': 0},
+                                    'return':
+                                       {'docs': [(doc.doc_id, doc.rev)],
+                                        'last_gen': 1}})
+        self.assertEqual([doc], self.db1.get_from_index('test-idx', 'value'))
+
+    def test_sync_supersedes_conflicts(self):
+        self.db1 = self.create_database('test1', 'both')
+        self.db2 = self.create_database('test2', 'target')
+        self.db3 = self.create_database('test3', 'both')
+        doc1 = self.db1.create_doc_from_json('{"a": 1}', doc_id='the-doc')
+        self.db2.create_doc_from_json('{"b": 1}', doc_id='the-doc')
+        self.db3.create_doc_from_json('{"c": 1}', doc_id='the-doc')
+        self.sync(self.db3, self.db1)
+        self.assertEqual(
+            self.db1._get_generation_info(),
+            self.db3._get_replica_gen_and_trans_id(self.db1._replica_uid))
+        self.assertEqual(
+            self.db3._get_generation_info(),
+            self.db1._get_replica_gen_and_trans_id(self.db3._replica_uid))
+        self.sync(self.db3, self.db2)
+        self.assertEqual(
+            self.db2._get_generation_info(),
+            self.db3._get_replica_gen_and_trans_id(self.db2._replica_uid))
+        self.assertEqual(
+            self.db3._get_generation_info(),
+            self.db2._get_replica_gen_and_trans_id(self.db3._replica_uid))
+        self.assertEqual(3, len(self.db3.get_doc_conflicts('the-doc')))
+        doc1.set_json('{"a": 2}')
+        self.db1.put_doc(doc1)
+        self.sync(self.db3, self.db1)
+        # original doc1 should have been removed from conflicts
+        self.assertEqual(3, len(self.db3.get_doc_conflicts('the-doc')))
+
+    def test_sync_stops_after_get_sync_info(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc)
+        self.sync(self.db1, self.db2)
+
+        def put_hook(state):
+            self.fail("Tracehook triggered for %s" % (state,))
+
+        self.sync(self.db1, self.db2, trace_hook_shallow=put_hook)
+
+    def test_sync_detects_rollback_in_source(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc1')
+        self.sync(self.db1, self.db2)
+        self.db1_copy = self.copy_database(self.db1)
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc2')
+        self.sync(self.db1, self.db2)
+        self.assertRaises(
+            errors.InvalidGeneration, self.sync, self.db1_copy, self.db2)
+
+    def test_sync_detects_rollback_in_target(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id="divergent")
+        self.sync(self.db1, self.db2)
+        self.db2_copy = self.copy_database(self.db2)
+        self.db2.create_doc_from_json(tests.simple_doc, doc_id='doc2')
+        self.sync(self.db1, self.db2)
+        self.assertRaises(
+            errors.InvalidGeneration, self.sync, self.db1, self.db2_copy)
+
+    def test_sync_detects_diverged_source(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db3 = self.copy_database(self.db1)
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id="divergent")
+        self.db3.create_doc_from_json(tests.simple_doc, doc_id="divergent")
+        self.sync(self.db1, self.db2)
+        self.assertRaises(
+            errors.InvalidTransactionId, self.sync, self.db3, self.db2)
+
+    def test_sync_detects_diverged_target(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db3 = self.copy_database(self.db2)
+        self.db3.create_doc_from_json(tests.nested_doc, doc_id="divergent")
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id="divergent")
+        self.sync(self.db1, self.db2)
+        self.assertRaises(
+            errors.InvalidTransactionId, self.sync, self.db1, self.db3)
+
+    def test_sync_detects_rollback_and_divergence_in_source(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc1')
+        self.sync(self.db1, self.db2)
+        self.db1_copy = self.copy_database(self.db1)
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc2')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id='doc3')
+        self.sync(self.db1, self.db2)
+        self.db1_copy.create_doc_from_json(tests.simple_doc, doc_id='doc2')
+        self.db1_copy.create_doc_from_json(tests.simple_doc, doc_id='doc3')
+        self.assertRaises(
+            errors.InvalidTransactionId, self.sync, self.db1_copy, self.db2)
+
+    def test_sync_detects_rollback_and_divergence_in_target(self):
+        self.db1 = self.create_database('test1', 'source')
+        self.db2 = self.create_database('test2', 'target')
+        self.db1.create_doc_from_json(tests.simple_doc, doc_id="divergent")
+        self.sync(self.db1, self.db2)
+        self.db2_copy = self.copy_database(self.db2)
+        self.db2.create_doc_from_json(tests.simple_doc, doc_id='doc2')
+        self.db2.create_doc_from_json(tests.simple_doc, doc_id='doc3')
+        self.sync(self.db1, self.db2)
+        self.db2_copy.create_doc_from_json(tests.simple_doc, doc_id='doc2')
+        self.db2_copy.create_doc_from_json(tests.simple_doc, doc_id='doc3')
+        self.assertRaises(
+            errors.InvalidTransactionId, self.sync, self.db1, self.db2_copy)
+
+
+def make_local_db_and_soledad_target(
+        test, path='test',
+        source_replica_uid=uuid4().hex):
+    test.startTwistedServer()
+    replica_uid = os.path.basename(path)
+    db = test.request_state._create_database(replica_uid)
+    sync_db = test._soledad._sync_db
+    sync_enc_pool = test._soledad._sync_enc_pool
+    st = soledad_sync_target(
+        test, db._dbname,
+        source_replica_uid=source_replica_uid,
+        sync_db=sync_db,
+        sync_enc_pool=sync_enc_pool)
+    return db, st
+
+target_scenarios = [
+    ('leap', {
+        'create_db_and_target': make_local_db_and_soledad_target,
+        'make_app_with_state': make_soledad_app,
+        'do_sync': sync_via_synchronizer_and_soledad}),
+]