Keep track of membership in Client API (#159)

* Saving memberships

* Removed unused index

* Removed useless log

* Fixed membership not being saved on the right conditions + added membership removal

* Updated outdated comment

* Use server lib method + check server name + use new roomserver API

* Better handling of events from the room server

* Fixed membership removal

* Corrected indentation

* Fix tests (hopefully)

* Replace broken kafka mirror

* Apply requested changes on database management

* Remove useless check and function

* Moved memberships update to the database package

* Use new common function

* Remove useless function

src/github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/membership_table.go

@@ -0,0 +1,85 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package accounts
+
+import (
+	"database/sql"
+
+	"github.com/lib/pq"
+)
+
+const membershipSchema = `
+-- Stores data about users memberships to rooms.
+CREATE TABLE IF NOT EXISTS memberships (
+    -- The Matrix user ID localpart for the member
+    localpart TEXT NOT NULL,
+    -- The room this user is a member of
+    room_id TEXT NOT NULL,
+    -- The ID of the join membership event
+    event_id TEXT NOT NULL,
+
+    -- A user can only be member of a room once
+    PRIMARY KEY (localpart, room_id)
+);
+
+-- Use index to process deletion by ID more efficiently
+CREATE UNIQUE INDEX IF NOT EXISTS membership_event_id ON memberships(event_id);
+`
+
+const insertMembershipSQL = "" +
+	"INSERT INTO memberships(localpart, room_id, event_id) VALUES ($1, $2, $3)"
+
+const selectMembershipSQL = "" +
+	"SELECT * from memberships WHERE localpart = $1 AND room_id = $2"
+
+const selectMembershipsByLocalpartSQL = "" +
+	"SELECT room_id FROM memberships WHERE localpart = $1"
+
+const deleteMembershipsByEventIDsSQL = "" +
+	"DELETE FROM memberships WHERE event_id = ANY($1)"
+
+type membershipStatements struct {
+	deleteMembershipsByEventIDsStmt  *sql.Stmt
+	insertMembershipStmt             *sql.Stmt
+	selectMembershipByEventIDStmt    *sql.Stmt
+	selectMembershipsByLocalpartStmt *sql.Stmt
+}
+
+func (s *membershipStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(membershipSchema)
+	if err != nil {
+		return
+	}
+	if s.deleteMembershipsByEventIDsStmt, err = db.Prepare(deleteMembershipsByEventIDsSQL); err != nil {
+		return
+	}
+	if s.insertMembershipStmt, err = db.Prepare(insertMembershipSQL); err != nil {
+		return
+	}
+	if s.selectMembershipsByLocalpartStmt, err = db.Prepare(selectMembershipsByLocalpartSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *membershipStatements) insertMembership(localpart string, roomID string, eventID string, txn *sql.Tx) (err error) {
+	_, err = txn.Stmt(s.insertMembershipStmt).Exec(localpart, roomID, eventID)
+	return
+}
+
+func (s *membershipStatements) deleteMembershipsByEventIDs(eventIDs []string, txn *sql.Tx) (err error) {
+	_, err = txn.Stmt(s.deleteMembershipsByEventIDsStmt).Exec(pq.StringArray(eventIDs))
+	return
+}

src/github.com/matrix-org/dendrite/clientapi/auth/storage/accounts/storage.go

@@ -18,6 +18,7 @@ import (
 	"database/sql"
 
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/gomatrixserverlib"
 	"golang.org/x/crypto/bcrypt"
 	// Import the postgres database driver.
@@ -27,8 +28,11 @@ import (
 // Database represents an account database
 type Database struct {
 	db          *sql.DB
+	partitions  common.PartitionOffsetStatements
 	accounts    accountsStatements
 	profiles    profilesStatements
+	memberships membershipStatements
+	serverName  gomatrixserverlib.ServerName
 }
 
 // NewDatabase creates a new accounts and profiles database
@@ -38,6 +42,10 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 	if db, err = sql.Open("postgres", dataSourceName); err != nil {
 		return nil, err
 	}
+	partitions := common.PartitionOffsetStatements{}
+	if err = partitions.Prepare(db); err != nil {
+		return nil, err
+	}
 	a := accountsStatements{}
 	if err = a.prepare(db, serverName); err != nil {
 		return nil, err
@@ -46,7 +54,11 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 	if err = p.prepare(db); err != nil {
 		return nil, err
 	}
-	return &Database{db, a, p}, nil
+	m := membershipStatements{}
+	if err = m.prepare(db); err != nil {
+		return nil, err
+	}
+	return &Database{db, partitions, a, p, m, serverName}, nil
 }
 
 // GetAccountByPassword returns the account associated with the given localpart and password.
@@ -93,6 +105,85 @@ func (d *Database) CreateAccount(localpart, plaintextPassword string) (*authtype
 	return d.accounts.insertAccount(localpart, hash)
 }
 
+// PartitionOffsets implements common.PartitionStorer
+func (d *Database) PartitionOffsets(topic string) ([]common.PartitionOffset, error) {
+	return d.partitions.SelectPartitionOffsets(topic)
+}
+
+// SetPartitionOffset implements common.PartitionStorer
+func (d *Database) SetPartitionOffset(topic string, partition int32, offset int64) error {
+	return d.partitions.UpsertPartitionOffset(topic, partition, offset)
+}
+
+// SaveMembership saves the user matching a given localpart as a member of a given
+// room. It also stores the ID of the `join` membership event.
+// If a membership already exists between the user and the room, or of the
+// insert fails, returns the SQL error
+func (d *Database) SaveMembership(localpart string, roomID string, eventID string, txn *sql.Tx) error {
+	return d.memberships.insertMembership(localpart, roomID, eventID, txn)
+}
+
+// removeMembershipsByEventIDs removes the memberships of which the `join` membership
+// event ID is included in a given array of events IDs
+// If the removal fails, or if there is no membership to remove, returns an error
+func (d *Database) removeMembershipsByEventIDs(eventIDs []string, txn *sql.Tx) error {
+	return d.memberships.deleteMembershipsByEventIDs(eventIDs, txn)
+}
+
+// UpdateMemberships adds the "join" membership events included in a given state
+// events array, and removes those which ID is included in a given array of events
+// IDs. All of the process is run in a transaction, which commits only once/if every
+// insertion and deletion has been successfully processed.
+// Returns a SQL error if there was an issue with any part of the process
+func (d *Database) UpdateMemberships(eventsToAdd []gomatrixserverlib.Event, idsToRemove []string) error {
+	return common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		if err := d.removeMembershipsByEventIDs(idsToRemove, txn); err != nil {
+			return err
+		}
+
+		for _, event := range eventsToAdd {
+			if err := d.newMembership(event, txn); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+}
+
+// newMembership will save a new membership in the database if the given state
+// event is a "join" membership event
+// If the event isn't a "join" membership event, does nothing
+// If an error occurred, returns it
+func (d *Database) newMembership(ev gomatrixserverlib.Event, txn *sql.Tx) error {
+	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
+		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
+		if err != nil {
+			return err
+		}
+
+		// We only want state events from local users
+		if string(serverName) != string(d.serverName) {
+			return nil
+		}
+
+		eventID := ev.EventID()
+		roomID := ev.RoomID()
+		membership, err := ev.Membership()
+		if err != nil {
+			return err
+		}
+
+		// Only "join" membership events can be considered as new memberships
+		if membership == "join" {
+			if err := d.SaveMembership(localpart, roomID, eventID, txn); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
 func hashPassword(plaintext string) (hash string, err error) {
 	hashBytes, err := bcrypt.GenerateFromPassword([]byte(plaintext), bcrypt.DefaultCost)
 	return string(hashBytes), err

src/github.com/matrix-org/dendrite/clientapi/consumers/roomserver.go

@@ -0,0 +1,141 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package consumers
+
+import (
+	"encoding/json"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/common/config"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	sarama "gopkg.in/Shopify/sarama.v1"
+)
+
+// OutputRoomEvent consumes events that originated in the room server.
+type OutputRoomEvent struct {
+	roomServerConsumer *common.ContinualConsumer
+	db                 *accounts.Database
+	query              api.RoomserverQueryAPI
+	serverName         string
+}
+
+// NewOutputRoomEvent creates a new OutputRoomEvent consumer. Call Start() to begin consuming from room servers.
+func NewOutputRoomEvent(cfg *config.Dendrite, store *accounts.Database) (*OutputRoomEvent, error) {
+	kafkaConsumer, err := sarama.NewConsumer(cfg.Kafka.Addresses, nil)
+	if err != nil {
+		return nil, err
+	}
+	roomServerURL := cfg.RoomServerURL()
+
+	consumer := common.ContinualConsumer{
+		Topic:          string(cfg.Kafka.Topics.OutputRoomEvent),
+		Consumer:       kafkaConsumer,
+		PartitionStore: store,
+	}
+	s := &OutputRoomEvent{
+		roomServerConsumer: &consumer,
+		db:                 store,
+		query:              api.NewRoomserverQueryAPIHTTP(roomServerURL, nil),
+		serverName:         string(cfg.Matrix.ServerName),
+	}
+	consumer.ProcessMessage = s.onMessage
+
+	return s, nil
+}
+
+// Start consuming from room servers
+func (s *OutputRoomEvent) Start() error {
+	return s.roomServerConsumer.Start()
+}
+
+// onMessage is called when the sync server receives a new event from the room server output log.
+// It is not safe for this function to be called from multiple goroutines, or else the
+// sync stream position may race and be incorrectly calculated.
+func (s *OutputRoomEvent) onMessage(msg *sarama.ConsumerMessage) error {
+	// Parse out the event JSON
+	var output api.OutputEvent
+	if err := json.Unmarshal(msg.Value, &output); err != nil {
+		// If the message was invalid, log it and move on to the next message in the stream
+		log.WithError(err).Errorf("roomserver output log: message parse failure")
+		return nil
+	}
+
+	if output.Type != api.OutputTypeNewRoomEvent {
+		log.WithField("type", output.Type).Debug(
+			"roomserver output log: ignoring unknown output type",
+		)
+		return nil
+	}
+
+	ev := output.NewRoomEvent.Event
+	log.WithFields(log.Fields{
+		"event_id": ev.EventID(),
+		"room_id":  ev.RoomID(),
+		"type":     ev.Type(),
+	}).Info("received event from roomserver")
+
+	events, err := s.lookupStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev)
+	if err != nil {
+		return err
+	}
+
+	if err := s.db.UpdateMemberships(events, output.NewRoomEvent.RemovesStateEventIDs); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// lookupStateEvents looks up the state events that are added by a new event.
+func (s *OutputRoomEvent) lookupStateEvents(
+	addsStateEventIDs []string, event gomatrixserverlib.Event,
+) ([]gomatrixserverlib.Event, error) {
+	// Fast path if there aren't any new state events.
+	if len(addsStateEventIDs) == 0 {
+		return nil, nil
+	}
+
+	// Fast path if the only state event added is the event itself.
+	if len(addsStateEventIDs) == 1 && addsStateEventIDs[0] == event.EventID() {
+		return []gomatrixserverlib.Event{event}, nil
+	}
+
+	result := []gomatrixserverlib.Event{}
+	missing := []string{}
+	for _, id := range addsStateEventIDs {
+		// Append the current event in the results if its ID is in the events list
+		if id == event.EventID() {
+			result = append(result, event)
+		} else {
+			// If the event isn't the current one, add it to the list of events
+			// to retrieve from the roomserver
+			missing = append(missing, id)
+		}
+	}
+
+	// Request the missing events from the roomserver
+	eventReq := api.QueryEventsByIDRequest{EventIDs: missing}
+	var eventResp api.QueryEventsByIDResponse
+	if err := s.query.QueryEventsByID(&eventReq, &eventResp); err != nil {
+		return nil, err
+	}
+
+	result = append(result, eventResp.Events...)
+
+	return result, nil
+}

src/github.com/matrix-org/dendrite/cmd/dendrite-client-api-server/main.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
 	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
+	"github.com/matrix-org/dendrite/clientapi/consumers"
 	"github.com/matrix-org/dendrite/clientapi/producers"
 	"github.com/matrix-org/dendrite/clientapi/routing"
 	"github.com/matrix-org/dendrite/common"
@@ -86,6 +87,14 @@ func main() {
 		KeyDatabase: keyDB,
 	}
 
+	consumer, err := consumers.NewOutputRoomEvent(cfg, accountDB)
+	if err != nil {
+		log.Panicf("startup: failed to create room server consumer: %s", err)
+	}
+	if err = consumer.Start(); err != nil {
+		log.Panicf("startup: failed to start room server consumer")
+	}
+
 	log.Info("Starting client API server on ", cfg.Listen.ClientAPI)
 	routing.Setup(
 		http.DefaultServeMux, http.DefaultClient, *cfg, roomserverProducer,

src/github.com/matrix-org/dendrite/cmd/mediaapi-integration-tests/main.go

@@ -104,14 +104,17 @@ func startMediaAPI(suffix string, dynamicThumbnails bool) (*exec.Cmd, chan error
 
 	proxyCmd, proxyCmdChan := test.StartProxy(proxyAddr, cfg)
 
-	cmd, cmdChan := test.StartServer(
-		serverType,
-		serverArgs,
+	test.InitDatabase(
 		postgresDatabase,
 		postgresContainerName,
 		databases,
 	)
 
+	cmd, cmdChan := test.CreateBackgroundCommand(
+		filepath.Join(filepath.Dir(os.Args[0]), "dendrite-"+serverType+"-server"),
+		serverArgs,
+	)
+
 	fmt.Printf("==TESTSERVER== STARTED %v -> %v : %v\n", proxyAddr, cfg.Listen.MediaAPI, dir)
 	return cmd, cmdChan, string(cfg.Listen.MediaAPI), proxyCmd, proxyCmdChan, proxyAddr, dir
 }

src/github.com/matrix-org/dendrite/cmd/syncserver-integration-tests/main.go

@@ -147,9 +147,7 @@ func startSyncServer() (*exec.Cmd, chan error) {
 		testDatabaseName,
 	}
 
-	cmd, cmdChan := test.StartServer(
-		"sync-api",
-		serverArgs,
+	test.InitDatabase(
 		postgresDatabase,
 		postgresContainerName,
 		databases,
@@ -165,6 +163,11 @@ func startSyncServer() (*exec.Cmd, chan error) {
 		panic(err)
 	}
 
+	cmd, cmdChan := test.CreateBackgroundCommand(
+		filepath.Join(filepath.Dir(os.Args[0]), "dendrite-sync-api-server"),
+		serverArgs,
+	)
+
 	return cmd, cmdChan
 }
 

src/github.com/matrix-org/dendrite/common/test/server.go

@@ -65,12 +65,8 @@ func CreateBackgroundCommand(command string, args []string) (*exec.Cmd, chan err
 	return cmd, cmdChan
 }
 
-// StartServer creates the database and config file needed for the server to run and
-// then starts the server. The Cmd being executed is returned. A channel is also returned,
-// which will have any termination errors sent down it, followed immediately by the channel being closed.
-// If postgresContainerName is not an empty string, psql will be run from inside that container. If it is
-// an empty string, psql will be assumed to be in PATH.
-func StartServer(serverType string, serverArgs []string, postgresDatabase, postgresContainerName string, databases []string) (*exec.Cmd, chan error) {
+// InitDatabase creates the database and config file needed for the server to run
+func InitDatabase(postgresDatabase, postgresContainerName string, databases []string) {
 	if len(databases) > 0 {
 		var dbCmd string
 		var dbArgs []string
@@ -89,11 +85,6 @@ func StartServer(serverType string, serverArgs []string, postgresDatabase, postg
 			}
 		}
 	}
-
-	return CreateBackgroundCommand(
-		filepath.Join(filepath.Dir(os.Args[0]), "dendrite-"+serverType+"-server"),
-		serverArgs,
-	)
 }
 
 // StartProxy creates a reverse proxy

travis-install-kafka.sh

@@ -5,7 +5,7 @@ set -eu
 # The mirror to download kafka from is picked from the list of mirrors at
 # https://www.apache.org/dyn/closer.cgi?path=/kafka/0.10.2.0/kafka_2.11-0.10.2.0.tgz
 # TODO: Check the signature since we are downloading over HTTP.
-MIRROR=http://mirror.ox.ac.uk/sites/rsync.apache.org/kafka/0.10.2.0/kafka_2.11-0.10.2.0.tgz
+MIRROR=http://apache.mirror.anlx.net/kafka/0.10.2.0/kafka_2.11-0.10.2.0.tgz
 
 # Only download the kafka if it isn't already downloaded.
 test -f kafka.tgz || wget $MIRROR -O kafka.tgz