buildbucket: support unique change urls

scripts/master/buildbucket/buildbot_gateway.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This file encapsulates most of buildbot API for BuildBucketIntegrator."""
 
 from buildbot.changes.changes import Change
 from buildbot.interfaces import IControl
 from buildbot.process.buildrequest import BuildRequest
 from buildbot.status import builder as build_results
@@ skipping 72 matching lines @@
     self.master = master
 
   def find_changes_by_revision(self, revision):
     """Searches for Changes in database by |revision| and returns change ids."""
     def find(conn):
       table = self.master.db.model.changes
       q = sa.select([table.c.changeid]).where(table.c.revision == revision)
       return [row.changeid for row in conn.execute(q)]
     return self.master.db.pool.do(find)
 
+  def find_changes_by_revlink(self, revlink):
+    """Searches for Changes in database by |revlink| and returns change ids."""
+    def find(conn):
+      table = self.master.db.model.changes
+      q = sa.select([table.c.changeid]).where(table.c.revlink == revlink)
+      return [row.changeid for row in conn.execute(q)]
+    return self.master.db.pool.do(find)
+
   @inlineCallbacks
   def get_change_by_id(self, change_id):
     """Returns buildot.changes.changes.Change as Deferred for |change_id|."""
     chdict = yield self.master.db.changes.getChange(change_id)
     change = yield Change.fromChdict(self.master, chdict)
     returnValue(change)
 
   def get_cache(self, name, miss_fn):
     """Returns a buildbot.util.lru.AsyncLRUCache by |name|.
 
@@ skipping 78 matching lines @@
     return self.master.getStatus().getURLForThing(build)
 
   def stop_build(self, build, reason):
     """Stops the |build|."""
     control = IControl(self.master)  # request IControl from self.master.
     builder_control = control.getBuilder(build.getBuilder().getName())
     assert builder_control
     build_control = builder_control.getBuild(build.getNumber())
     assert build_control
     build_control.stopBuild(reason)