Merge pull request #100 from matrix-org/missing_pdu_compat

Handle if get_missing_pdu returns 400 or not all events.

synapse/federation/federation_client.py

@@ -19,14 +19,18 @@ from twisted.internet import defer
 from .federation_base import FederationBase
 from .units import Edu
 
-from synapse.api.errors import CodeMessageException, SynapseError
+from synapse.api.errors import (
+    CodeMessageException, HttpResponseException, SynapseError,
+)
 from synapse.util.expiringcache import ExpiringCache
 from synapse.util.logutils import log_function
 from synapse.events import FrozenEvent
 
 from synapse.util.retryutils import get_retry_limiter, NotRetryingDestination
 
+import itertools
 import logging
+import random
 
 
 logger = logging.getLogger(__name__)
@@ -440,11 +444,30 @@ class FederationClient(FederationBase):
         defer.returnValue(ret)
 
     @defer.inlineCallbacks
-    def get_missing_events(self, destination, room_id, earliest_events,
+    def get_missing_events(self, destination, room_id, earliest_events_ids,
                            latest_events, limit, min_depth):
+        """Tries to fetch events we are missing. This is called when we receive
+        an event without having received all of its ancestors.
+
+        Args:
+            destination (str)
+            room_id (str)
+            earliest_events_ids (list): List of event ids. Effectively the
+                events we expected to receive, but haven't. `get_missing_events`
+                should only return events that didn't happen before these.
+            latest_events (list): List of events we have received that we don't
+                have all previous events for.
+            limit (int): Maximum number of events to return.
+            min_depth (int): Minimum depth of events tor return.
+        """
+        try:
             content = yield self.transport_layer.get_missing_events(
-            destination, room_id, earliest_events, latest_events, limit,
-            min_depth,
+                destination=destination,
+                room_id=room_id,
+                earliest_events=earliest_events_ids,
+                latest_events=[e.event_id for e in latest_events],
+                limit=limit,
+                min_depth=min_depth,
             )
 
             events = [
@@ -456,6 +479,78 @@ class FederationClient(FederationBase):
                 destination, events, outlier=True
             )
 
+            have_gotten_all_from_destination = True
+        except HttpResponseException as e:
+            if not e.code == 400:
+                raise
+
+            # We are probably hitting an old server that doesn't support
+            # get_missing_events
+            signed_events = []
+            have_gotten_all_from_destination = False
+
+        if len(signed_events) >= limit:
+            defer.returnValue(signed_events)
+
+        servers = yield self.store.get_joined_hosts_for_room(room_id)
+
+        servers = set(servers)
+        servers.discard(self.server_name)
+
+        failed_to_fetch = set()
+
+        while len(signed_events) < limit:
+            # Are we missing any?
+
+            seen_events = set(earliest_events_ids)
+            seen_events.update(e.event_id for e in signed_events)
+
+            missing_events = {}
+            for e in itertools.chain(latest_events, signed_events):
+                if e.depth > min_depth:
+                    missing_events.update({
+                        e_id: e.depth for e_id, _ in e.prev_events
+                        if e_id not in seen_events
+                        and e_id not in failed_to_fetch
+                    })
+
+            if not missing_events:
+                break
+
+            have_seen = yield self.store.have_events(missing_events)
+
+            for k in have_seen:
+                missing_events.pop(k, None)
+
+            if not missing_events:
+                break
+
+            # Okay, we haven't gotten everything yet. Lets get them.
+            ordered_missing = sorted(missing_events.items(), key=lambda x: x[0])
+
+            if have_gotten_all_from_destination:
+                servers.discard(destination)
+
+            def random_server_list():
+                srvs = list(servers)
+                random.shuffle(srvs)
+                return srvs
+
+            deferreds = [
+                self.get_pdu(
+                    destinations=random_server_list(),
+                    event_id=e_id,
+                )
+                for e_id, depth in ordered_missing[:limit - len(signed_events)]
+            ]
+
+            res = yield defer.DeferredList(deferreds, consumeErrors=True)
+            for (result, val), (e_id, _) in zip(res, ordered_missing):
+                if result:
+                    signed_events.append(val)
+                else:
+                    failed_to_fetch.add(e_id)
+
         defer.returnValue(signed_events)
 
     def event_from_pdu_json(self, pdu_json, outlier=False):

synapse/federation/federation_server.py

@@ -413,12 +413,16 @@ class FederationServer(FederationBase):
                     missing_events = yield self.get_missing_events(
                         origin,
                         pdu.room_id,
-                        earliest_events=list(latest),
-                        latest_events=[pdu.event_id],
+                        earliest_events_ids=list(latest),
+                        latest_events=[pdu],
                         limit=10,
                         min_depth=min_depth,
                     )
 
+                    # We want to sort these by depth so we process them and
+                    # tell clients about them in order.
+                    missing_events.sort(key=lambda x: x.depth)
+
                     for e in missing_events:
                         yield self._handle_new_pdu(
                             origin,