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// 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 queue
import (
"context"
"fmt"
"sync"
"time"
"github.com/matrix-org/gomatrixserverlib"
log "github.com/sirupsen/logrus"
)
// destinationQueue is a queue of events for a single destination.
// It is responsible for sending the events to the destination and
// ensures that only one request is in flight to a given destination
// at a time.
type destinationQueue struct {
client *gomatrixserverlib.FederationClient
origin gomatrixserverlib.ServerName
destination gomatrixserverlib.ServerName
// The running mutex protects running, sentCounter, lastTransactionIDs and
// pendingEvents, pendingEDUs.
runningMutex sync.Mutex
running bool
sentCounter int
lastTransactionIDs []gomatrixserverlib.TransactionID
pendingEvents []*gomatrixserverlib.Event
pendingEDUs []*gomatrixserverlib.EDU
}
// Send event adds the event to the pending queue for the destination.
// If the queue is empty then it starts a background goroutine to
// start sending events to that destination.
func (oq *destinationQueue) sendEvent(ev *gomatrixserverlib.Event) {
oq.runningMutex.Lock()
defer oq.runningMutex.Unlock()
oq.pendingEvents = append(oq.pendingEvents, ev)
if !oq.running {
oq.running = true
go oq.backgroundSend()
}
}
// sendEDU adds the EDU event to the pending queue for the destination.
// If the queue is empty then it starts a background goroutine to
// start sending event to that destination.
func (oq *destinationQueue) sendEDU(e *gomatrixserverlib.EDU) {
oq.runningMutex.Lock()
defer oq.runningMutex.Unlock()
oq.pendingEDUs = append(oq.pendingEDUs, e)
if !oq.running {
oq.running = true
go oq.backgroundSend()
}
}
func (oq *destinationQueue) backgroundSend() {
for {
t := oq.next()
if t == nil {
// If the queue is empty then stop processing for this destination.
// TODO: Remove this destination from the queue map.
return
}
// TODO: handle retries.
// TODO: blacklist uncooperative servers.
_, err := oq.client.SendTransaction(context.TODO(), *t)
if err != nil {
log.WithFields(log.Fields{
"destination": oq.destination,
log.ErrorKey: err,
}).Info("problem sending transaction")
}
}
}
// next creates a new transaction from the pending event queue
// and flushes the queue.
// Returns nil if the queue was empty.
func (oq *destinationQueue) next() *gomatrixserverlib.Transaction {
oq.runningMutex.Lock()
defer oq.runningMutex.Unlock()
if len(oq.pendingEvents) == 0 && len(oq.pendingEDUs) == 0 {
oq.running = false
return nil
}
var t gomatrixserverlib.Transaction
now := gomatrixserverlib.AsTimestamp(time.Now())
t.TransactionID = gomatrixserverlib.TransactionID(fmt.Sprintf("%d-%d", now, oq.sentCounter))
t.Origin = oq.origin
t.Destination = oq.destination
t.OriginServerTS = now
t.PreviousIDs = oq.lastTransactionIDs
if t.PreviousIDs == nil {
t.PreviousIDs = []gomatrixserverlib.TransactionID{}
}
oq.lastTransactionIDs = []gomatrixserverlib.TransactionID{t.TransactionID}
for _, pdu := range oq.pendingEvents {
t.PDUs = append(t.PDUs, *pdu)
}
oq.pendingEvents = nil
oq.sentCounter += len(t.PDUs)
for _, edu := range oq.pendingEDUs {
t.EDUs = append(t.EDUs, *edu)
}
oq.pendingEDUs = nil
oq.sentCounter += len(t.EDUs)
return &t
}
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