Rename the typing server to EDU server (#948)

* Blunt move and sed rename

* Rename common/ refs to typing

* Rename internal stuff in eduserver

* Rename docs and scripts

* Rename constants/filenames, goimports everything to re-order imports

federationsender/consumers/eduserver.go

@@ -0,0 +1,96 @@
+// 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 (
+	"context"
+	"encoding/json"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/common/config"
+	"github.com/matrix-org/dendrite/eduserver/api"
+	"github.com/matrix-org/dendrite/federationsender/queue"
+	"github.com/matrix-org/dendrite/federationsender/storage"
+	"github.com/matrix-org/gomatrixserverlib"
+	log "github.com/sirupsen/logrus"
+	"gopkg.in/Shopify/sarama.v1"
+)
+
+// OutputTypingEventConsumer consumes events that originate in EDU server.
+type OutputTypingEventConsumer struct {
+	consumer   *common.ContinualConsumer
+	db         storage.Database
+	queues     *queue.OutgoingQueues
+	ServerName gomatrixserverlib.ServerName
+}
+
+// NewOutputTypingEventConsumer creates a new OutputTypingEventConsumer. Call Start() to begin consuming from EDU servers.
+func NewOutputTypingEventConsumer(
+	cfg *config.Dendrite,
+	kafkaConsumer sarama.Consumer,
+	queues *queue.OutgoingQueues,
+	store storage.Database,
+) *OutputTypingEventConsumer {
+	consumer := common.ContinualConsumer{
+		Topic:          string(cfg.Kafka.Topics.OutputTypingEvent),
+		Consumer:       kafkaConsumer,
+		PartitionStore: store,
+	}
+	c := &OutputTypingEventConsumer{
+		consumer:   &consumer,
+		queues:     queues,
+		db:         store,
+		ServerName: cfg.Matrix.ServerName,
+	}
+	consumer.ProcessMessage = c.onMessage
+
+	return c
+}
+
+// Start consuming from EDU servers
+func (t *OutputTypingEventConsumer) Start() error {
+	return t.consumer.Start()
+}
+
+// onMessage is called for OutputTypingEvent received from the EDU servers.
+// Parses the msg, creates a matrix federation EDU and sends it to joined hosts.
+func (t *OutputTypingEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
+	// Extract the typing event from msg.
+	var ote api.OutputTypingEvent
+	if err := json.Unmarshal(msg.Value, &ote); err != nil {
+		// Skip this msg but continue processing messages.
+		log.WithError(err).Errorf("eduserver output log: message parse failed")
+		return nil
+	}
+
+	joined, err := t.db.GetJoinedHosts(context.TODO(), ote.Event.RoomID)
+	if err != nil {
+		return err
+	}
+
+	names := make([]gomatrixserverlib.ServerName, len(joined))
+	for i := range joined {
+		names[i] = joined[i].ServerName
+	}
+
+	edu := &gomatrixserverlib.EDU{Type: ote.Event.Type}
+	if edu.Content, err = json.Marshal(map[string]interface{}{
+		"room_id": ote.Event.RoomID,
+		"user_id": ote.Event.UserID,
+		"typing":  ote.Event.Typing,
+	}); err != nil {
+		return err
+	}
+
+	return t.queues.SendEDU(edu, t.ServerName, names)
+}