Some fixes for #847 (#850)

* Fix a couple of cases where backfilling events we already had causes panics, hopefully fix ordering of events, update GMSL dependency for backfill URL fixes

* Remove commented out lines from output_room_events_table schema

go.mod

@@ -7,18 +7,19 @@ require (
 	github.com/eapache/go-resiliency v0.0.0-20160104191539-b86b1ec0dd42 // indirect
 	github.com/eapache/go-xerial-snappy v0.0.0-20160609142408-bb955e01b934 // indirect
 	github.com/eapache/queue v1.1.0 // indirect
-	github.com/golang/snappy v0.0.0-20170119014723-7db9049039a0 // indirect
 	github.com/gorilla/mux v1.7.3
+	github.com/ipfs/go-cid v0.0.4
 	github.com/klauspost/crc32 v0.0.0-20161016154125-cb6bfca970f6 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/lib/pq v1.2.0
+	github.com/libp2p/go-libp2p-kad-dht v0.5.0
 	github.com/matrix-org/dugong v0.0.0-20171220115018-ea0a4690a0d5
 	github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20200110113524-5f9a44f2fc67
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20200124100636-0c2ec91d1df5
 	github.com/matrix-org/naffka v0.0.0-20171115094957-662bfd0841d0
 	github.com/matrix-org/util v0.0.0-20171127121716-2e2df66af2f5
 	github.com/nfnt/resize v0.0.0-20160724205520-891127d8d1b5
-	github.com/opentracing/opentracing-go v0.0.0-20170806192116-8ebe5d4e236e
+	github.com/opentracing/opentracing-go v1.0.2
 	github.com/pierrec/lz4 v0.0.0-20161206202305-5c9560bfa9ac // indirect
 	github.com/pierrec/xxHash v0.0.0-20160112165351-5a004441f897 // indirect
 	github.com/pkg/errors v0.8.1
@@ -29,7 +30,7 @@ require (
 	github.com/uber/jaeger-client-go v2.15.0+incompatible
 	github.com/uber/jaeger-lib v1.5.0
 	go.uber.org/atomic v1.3.0 // indirect
-	golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 	gopkg.in/Shopify/sarama.v1 v1.11.0
 	gopkg.in/h2non/bimg.v1 v1.0.18
 	gopkg.in/yaml.v2 v2.2.2

go.sum

@@ -1,147 +1,378 @@
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-mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
-mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphDJbHOQO1DFFFTeBo=
-mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
-mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f h1:Cq7MalBHYACRd6EesksG1Q8EoIAKOsiZviGKbOLIej4=
-mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZIVpwbkw+04kSxk3rAtzlimaUJw=
-sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4 h1:JPJh2pk3+X4lXAkZIk2RuE/7/FoK9maXw+TNPJhVS/c=
-sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

syncapi/routing/messages.go

@@ -222,13 +222,13 @@ func (r *messagesReq) retrieveEvents() (
 	// reliable way to define it), it would be easier and less troublesome to
 	// only have to change it in one place, i.e. the database.
 	startPos, err := r.db.EventPositionInTopology(
-		r.ctx, streamEvents[0].EventID(),
+		r.ctx, events[0].EventID(),
 	)
 	if err != nil {
 		return
 	}
 	endPos, err := r.db.EventPositionInTopology(
-		r.ctx, streamEvents[len(streamEvents)-1].EventID(),
+		r.ctx, events[len(events)-1].EventID(),
 	)
 	if err != nil {
 		return

syncapi/storage/postgres/backward_extremities_table.go

@@ -33,7 +33,8 @@ CREATE TABLE IF NOT EXISTS syncapi_backward_extremities (
 
 const insertBackwardExtremitySQL = "" +
 	"INSERT INTO syncapi_backward_extremities (room_id, event_id)" +
-	" VALUES ($1, $2)"
+	" VALUES ($1, $2)" +
+	" ON CONFLICT DO NOTHING"
 
 const selectBackwardExtremitiesForRoomSQL = "" +
 	"SELECT event_id FROM syncapi_backward_extremities WHERE room_id = $1"

syncapi/storage/postgres/output_room_events_table.go

@@ -42,7 +42,7 @@ CREATE TABLE IF NOT EXISTS syncapi_output_room_events (
   --     This isn't a problem for us since we just want to order by this field.
   id BIGINT PRIMARY KEY DEFAULT nextval('syncapi_stream_id'),
   -- The event ID for the event
-  event_id TEXT NOT NULL,
+  event_id TEXT NOT NULL CONSTRAINT syncapi_event_id_idx UNIQUE,
   -- The 'room_id' key for the event.
   room_id TEXT NOT NULL,
   -- The JSON for the event. Stored as TEXT because this should be valid UTF-8.
@@ -67,14 +67,14 @@ CREATE TABLE IF NOT EXISTS syncapi_output_room_events (
   -- were emitted.
   exclude_from_sync BOOL DEFAULT FALSE
 );
--- for event selection
-CREATE UNIQUE INDEX IF NOT EXISTS syncapi_event_id_idx ON syncapi_output_room_events(event_id);
 `
 
 const insertEventSQL = "" +
 	"INSERT INTO syncapi_output_room_events (" +
 	"room_id, event_id, event_json, type, sender, contains_url, add_state_ids, remove_state_ids, session_id, transaction_id, exclude_from_sync" +
-	") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11) RETURNING id"
+	") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11) " +
+	"ON CONFLICT ON CONSTRAINT syncapi_event_id_idx DO UPDATE SET exclude_from_sync = $11 " +
+	"RETURNING id"
 
 const selectEventsSQL = "" +
 	"SELECT id, event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events WHERE event_id = ANY($1)"