adding double quarantine support for db replication

Author: David Goetz

swift/common/db_replicator.py

@@ -20,6 +20,8 @@
 import math
 import time
 import shutil
+import uuid
+import errno
 
 from eventlet import GreenPool, sleep, Timeout, TimeoutError
 from eventlet.green import subprocess
@@ -49,7 +51,13 @@ def quarantine_db(object_file, server_type):
     quarantine_dir = os.path.abspath(os.path.join(object_dir, '..',
         '..', '..', '..', 'quarantined', server_type + 's',
         os.path.basename(object_dir)))
-    renamer(object_dir, quarantine_dir)
+    try:
+        renamer(object_dir, quarantine_dir)
+    except OSError, e:
+        if e.errno not in (errno.EEXIST, errno.ENOTEMPTY):
+            raise
+        quarantine_dir = "%s-%s" % (quarantine_dir, uuid.uuid4().hex)
+        renamer(object_dir, quarantine_dir)
 
 
 class ReplConnection(BufferedHTTPConnection):

test/unit/common/test_db_replicator.py

@@ -17,8 +17,10 @@
 from contextlib import contextmanager
 import os
 import logging
+import errno
 
 from swift.common import db_replicator
+from swift.common import utils
 from swift.common.utils import normalize_timestamp
 from swift.container import server as container_server
 
@@ -86,6 +88,8 @@ def getmtime(self, file):
 
 class FakeBroker:
     db_file = __file__
+    get_repl_missing_table = False
+    db_type = 'container'
     def __init__(self, *args, **kwargs):
         return None
     @contextmanager
@@ -104,6 +108,8 @@ def merge_syncs(self, *args, **kwargs):
     def merge_items(self, *args):
         self.args = args
     def get_replication_info(self):
+        if self.get_repl_missing_table:
+            raise Exception('no such table')
         return {'delete_timestamp': 0, 'put_timestamp': 1, 'count': 0}
     def reclaim(self, item_timestamp, sync_timestamp):
         pass
@@ -202,6 +208,35 @@ def test_replicate_object(self):
         replicator = TestReplicator({})
         replicator._replicate_object('0', 'file', 'node_id')
 
+    def test_replicate_object_quarantine(self):
+        replicator = TestReplicator({})
+        was_db_file = replicator.brokerclass.db_file
+        try:
+
+            def mock_renamer(was, new, cause_colision=False):
+                if cause_colision and '-' not in new:
+                    raise OSError(errno.EEXIST, "File already exists")
+                self.assertEquals('/a/b/c/d/e', was)
+                if '-' in new:
+                    self.assert_(
+                        new.startswith('/a/quarantined/containers/e-'))
+                else:
+                    self.assertEquals('/a/quarantined/containers/e', new)
+
+            def mock_renamer_error(was, new):
+                return mock_renamer(was, new, cause_colision=True)
+            was_renamer = db_replicator.renamer
+            db_replicator.renamer = mock_renamer
+            db_replicator.lock_parent_directory = lock_parent_directory
+            replicator.brokerclass.get_repl_missing_table = True
+            replicator.brokerclass.db_file = '/a/b/c/d/e/hey'
+            replicator._replicate_object('0', 'file', 'node_id')
+            # try the double quarantine
+            db_replicator.renamer = mock_renamer_error
+            replicator._replicate_object('0', 'file', 'node_id')
+        finally:
+            replicator.brokerclass.db_file = was_db_file
+            db_replicator.renamer = was_renamer
 
 #    def test_dispatch(self):
 #        rpc = db_replicator.ReplicatorRpc('/', '/', FakeBroker, False)