Graceful shutdowns (#1734)

* Initial graceful stop

* Fix dendritejs

* Use process context for outbound federation requests in destination queues

* Reduce logging

* Fix log level

appservice/appservice.go

@@ -89,7 +89,7 @@ func NewInternalAPI(
 	// We can't add ASes at runtime so this is safe to do.
 	if len(workerStates) > 0 {
 		consumer := consumers.NewOutputRoomEventConsumer(
-			base.Cfg, consumer, appserviceDB,
+			base.ProcessContext, base.Cfg, consumer, appserviceDB,
 			rsAPI, workerStates,
 		)
 		if err := consumer.Start(); err != nil {

appservice/consumers/roomserver.go

@@ -23,6 +23,7 @@ import (
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/gomatrixserverlib"
 
 	"github.com/Shopify/sarama"
@@ -41,6 +42,7 @@ type OutputRoomEventConsumer struct {
 // NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call
 // Start() to begin consuming from room servers.
 func NewOutputRoomEventConsumer(
+	process *process.ProcessContext,
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	appserviceDB storage.Database,
@@ -48,6 +50,7 @@ func NewOutputRoomEventConsumer(
 	workerStates []types.ApplicationServiceWorkerState,
 ) *OutputRoomEventConsumer {
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "appservice/roomserver",
 		Topic:          cfg.Global.Kafka.TopicFor(config.TopicOutputRoomEvent),
 		Consumer:       kafkaConsumer,

build/gobind/monolith.go

@@ -166,6 +166,7 @@ func (m *DendriteMonolith) Start() {
 		),
 	}
 	monolith.AddAllPublicRoutes(
+		base.ProcessContext,
 		base.PublicClientAPIMux,
 		base.PublicFederationAPIMux,
 		base.PublicKeyAPIMux,

cmd/dendrite-demo-libp2p/main.go

@@ -192,6 +192,7 @@ func main() {
 		ExtPublicRoomsProvider: provider,
 	}
 	monolith.AddAllPublicRoutes(
+		base.Base.ProcessContext,
 		base.Base.PublicClientAPIMux,
 		base.Base.PublicFederationAPIMux,
 		base.Base.PublicKeyAPIMux,
@@ -234,5 +235,5 @@ func main() {
 	}
 
 	// We want to block forever to let the HTTP and HTTPS handler serve the APIs
-	select {}
+	base.Base.WaitForShutdown()
 }

cmd/dendrite-demo-yggdrasil/main.go

@@ -150,6 +150,7 @@ func main() {
 		),
 	}
 	monolith.AddAllPublicRoutes(
+		base.ProcessContext,
 		base.PublicClientAPIMux,
 		base.PublicFederationAPIMux,
 		base.PublicKeyAPIMux,
@@ -200,5 +201,6 @@ func main() {
 		}
 	}()
 
-	select {}
+	// We want to block forever to let the HTTP and HTTPS handler serve the APIs
+	base.WaitForShutdown()
 }

cmd/dendrite-monolith-server/main.go

@@ -144,6 +144,7 @@ func main() {
 		KeyAPI:              keyAPI,
 	}
 	monolith.AddAllPublicRoutes(
+		base.ProcessContext,
 		base.PublicClientAPIMux,
 		base.PublicFederationAPIMux,
 		base.PublicKeyAPIMux,
@@ -176,5 +177,5 @@ func main() {
 	}
 
 	// We want to block forever to let the HTTP and HTTPS handler serve the APIs
-	select {}
+	base.WaitForShutdown()
 }

cmd/dendrite-polylith-multi/main.go

@@ -74,5 +74,6 @@ func main() {
 	base := setup.NewBaseDendrite(cfg, component, false) // TODO
 	defer base.Close()                                   // nolint: errcheck
 
-	start(base, cfg)
+	go start(base, cfg)
+	base.WaitForShutdown()
 }

cmd/dendrite-polylith-multi/personalities/syncapi.go

@@ -27,6 +27,7 @@ func SyncAPI(base *setup.BaseDendrite, cfg *config.Dendrite) {
 	rsAPI := base.RoomserverHTTPClient()
 
 	syncapi.AddPublicRoutes(
+		base.ProcessContext,
 		base.PublicClientAPIMux, userAPI, rsAPI,
 		base.KeyServerHTTPClient(),
 		federation, &cfg.SyncAPI,

cmd/dendritejs/main.go

@@ -231,6 +231,7 @@ func main() {
 		ExtPublicRoomsProvider: p2pPublicRoomProvider,
 	}
 	monolith.AddAllPublicRoutes(
+		base.ProcessContext,
 		base.PublicClientAPIMux,
 		base.PublicFederationAPIMux,
 		base.PublicKeyAPIMux,

federationsender/consumers/eduserver.go

@@ -25,6 +25,7 @@ import (
 	"github.com/matrix-org/dendrite/federationsender/storage"
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 	log "github.com/sirupsen/logrus"
@@ -44,6 +45,7 @@ type OutputEDUConsumer struct {
 
 // NewOutputEDUConsumer creates a new OutputEDUConsumer. Call Start() to begin consuming from EDU servers.
 func NewOutputEDUConsumer(
+	process *process.ProcessContext,
 	cfg *config.FederationSender,
 	kafkaConsumer sarama.Consumer,
 	queues *queue.OutgoingQueues,
@@ -51,18 +53,21 @@ func NewOutputEDUConsumer(
 ) *OutputEDUConsumer {
 	c := &OutputEDUConsumer{
 		typingConsumer: &internal.ContinualConsumer{
+			Process:        process,
 			ComponentName:  "eduserver/typing",
 			Topic:          cfg.Matrix.Kafka.TopicFor(config.TopicOutputTypingEvent),
 			Consumer:       kafkaConsumer,
 			PartitionStore: store,
 		},
 		sendToDeviceConsumer: &internal.ContinualConsumer{
+			Process:        process,
 			ComponentName:  "eduserver/sendtodevice",
 			Topic:          cfg.Matrix.Kafka.TopicFor(config.TopicOutputSendToDeviceEvent),
 			Consumer:       kafkaConsumer,
 			PartitionStore: store,
 		},
 		receiptConsumer: &internal.ContinualConsumer{
+			Process:        process,
 			ComponentName:  "eduserver/receipt",
 			Topic:          cfg.Matrix.Kafka.TopicFor(config.TopicOutputReceiptEvent),
 			Consumer:       kafkaConsumer,

federationsender/consumers/keychange.go

@@ -26,6 +26,7 @@ import (
 	"github.com/matrix-org/dendrite/keyserver/api"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/gomatrixserverlib"
 	log "github.com/sirupsen/logrus"
 )
@@ -41,6 +42,7 @@ type KeyChangeConsumer struct {
 
 // NewKeyChangeConsumer creates a new KeyChangeConsumer. Call Start() to begin consuming from key servers.
 func NewKeyChangeConsumer(
+	process *process.ProcessContext,
 	cfg *config.KeyServer,
 	kafkaConsumer sarama.Consumer,
 	queues *queue.OutgoingQueues,
@@ -49,6 +51,7 @@ func NewKeyChangeConsumer(
 ) *KeyChangeConsumer {
 	c := &KeyChangeConsumer{
 		consumer: &internal.ContinualConsumer{
+			Process:        process,
 			ComponentName:  "federationsender/keychange",
 			Topic:          string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputKeyChangeEvent)),
 			Consumer:       kafkaConsumer,

federationsender/consumers/roomserver.go

@@ -26,6 +26,7 @@ import (
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/gomatrixserverlib"
 	log "github.com/sirupsen/logrus"
 )
@@ -41,6 +42,7 @@ type OutputRoomEventConsumer struct {
 
 // NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
 func NewOutputRoomEventConsumer(
+	process *process.ProcessContext,
 	cfg *config.FederationSender,
 	kafkaConsumer sarama.Consumer,
 	queues *queue.OutgoingQueues,
@@ -48,6 +50,7 @@ func NewOutputRoomEventConsumer(
 	rsAPI api.RoomserverInternalAPI,
 ) *OutputRoomEventConsumer {
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "federationsender/roomserver",
 		Topic:          string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputRoomEvent)),
 		Consumer:       kafkaConsumer,

federationsender/federationsender.go

@@ -59,7 +59,8 @@ func NewInternalAPI(
 	consumer, _ := kafka.SetupConsumerProducer(&cfg.Matrix.Kafka)
 
 	queues := queue.NewOutgoingQueues(
-		federationSenderDB, cfg.Matrix.DisableFederation,
+		federationSenderDB, base.ProcessContext,
+		cfg.Matrix.DisableFederation,
 		cfg.Matrix.ServerName, federation, rsAPI, stats,
 		&queue.SigningInfo{
 			KeyID:      cfg.Matrix.KeyID,
@@ -69,7 +70,7 @@ func NewInternalAPI(
 	)
 
 	rsConsumer := consumers.NewOutputRoomEventConsumer(
-		cfg, consumer, queues,
+		base.ProcessContext, cfg, consumer, queues,
 		federationSenderDB, rsAPI,
 	)
 	if err = rsConsumer.Start(); err != nil {
@@ -77,13 +78,13 @@ func NewInternalAPI(
 	}
 
 	tsConsumer := consumers.NewOutputEDUConsumer(
-		cfg, consumer, queues, federationSenderDB,
+		base.ProcessContext, cfg, consumer, queues, federationSenderDB,
 	)
 	if err := tsConsumer.Start(); err != nil {
 		logrus.WithError(err).Panic("failed to start typing server consumer")
 	}
 	keyConsumer := consumers.NewKeyChangeConsumer(
-		&base.Cfg.KeyServer, consumer, queues, federationSenderDB, rsAPI,
+		base.ProcessContext, &base.Cfg.KeyServer, consumer, queues, federationSenderDB, rsAPI,
 	)
 	if err := keyConsumer.Start(); err != nil {
 		logrus.WithError(err).Panic("failed to start key server consumer")

federationsender/queue/destinationqueue.go

@@ -25,6 +25,7 @@ import (
 	"github.com/matrix-org/dendrite/federationsender/storage"
 	"github.com/matrix-org/dendrite/federationsender/storage/shared"
 	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/gomatrix"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/sirupsen/logrus"
@@ -46,6 +47,7 @@ const (
 // at a time.
 type destinationQueue struct {
 	db                 storage.Database
+	process            *process.ProcessContext
 	signing            *SigningInfo
 	rsAPI              api.RoomserverInternalAPI
 	client             *gomatrixserverlib.FederationClient // federation client
@@ -411,7 +413,7 @@ func (oq *destinationQueue) nextTransaction(
 	// TODO: we should check for 500-ish fails vs 400-ish here,
 	// since we shouldn't queue things indefinitely in response
 	// to a 400-ish error
-	ctx, cancel := context.WithTimeout(context.Background(), time.Minute*5)
+	ctx, cancel := context.WithTimeout(oq.process.Context(), time.Minute*5)
 	defer cancel()
 	_, err := oq.client.SendTransaction(ctx, t)
 	switch err.(type) {

federationsender/queue/queue.go

@@ -26,6 +26,7 @@ import (
 	"github.com/matrix-org/dendrite/federationsender/storage"
 	"github.com/matrix-org/dendrite/federationsender/storage/shared"
 	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/prometheus/client_golang/prometheus"
 	log "github.com/sirupsen/logrus"
@@ -36,6 +37,7 @@ import (
 // matrix servers
 type OutgoingQueues struct {
 	db          storage.Database
+	process     *process.ProcessContext
 	disabled    bool
 	rsAPI       api.RoomserverInternalAPI
 	origin      gomatrixserverlib.ServerName
@@ -80,6 +82,7 @@ var destinationQueueBackingOff = prometheus.NewGauge(
 // NewOutgoingQueues makes a new OutgoingQueues
 func NewOutgoingQueues(
 	db storage.Database,
+	process *process.ProcessContext,
 	disabled bool,
 	origin gomatrixserverlib.ServerName,
 	client *gomatrixserverlib.FederationClient,
@@ -89,6 +92,7 @@ func NewOutgoingQueues(
 ) *OutgoingQueues {
 	queues := &OutgoingQueues{
 		disabled:   disabled,
+		process:    process,
 		db:         db,
 		rsAPI:      rsAPI,
 		origin:     origin,
@@ -151,6 +155,7 @@ func (oqs *OutgoingQueues) getQueue(destination gomatrixserverlib.ServerName) *d
 		destinationQueueTotal.Inc()
 		oq = &destinationQueue{
 			db:               oqs.db,
+			process:          oqs.process,
 			rsAPI:            oqs.rsAPI,
 			origin:           oqs.origin,
 			destination:      destination,

internal/consumers.go

@@ -20,6 +20,8 @@ import (
 
 	"github.com/Shopify/sarama"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/setup/process"
+	"github.com/sirupsen/logrus"
 )
 
 // A PartitionStorer has the storage APIs needed by the consumer.
@@ -33,6 +35,9 @@ type PartitionStorer interface {
 // A ContinualConsumer continually consumes logs even across restarts. It requires a PartitionStorer to
 // remember the offset it reached.
 type ContinualConsumer struct {
+	// The parent context for the listener, stop consuming when this context is done
+	Process *process.ProcessContext
+	// The component name
 	ComponentName string
 	// The kafkaesque topic to consume events from.
 	// This is the name used in kafka to identify the stream to consume events from.
@@ -100,6 +105,15 @@ func (c *ContinualConsumer) StartOffsets() ([]sqlutil.PartitionOffset, error) {
 	}
 	for _, pc := range partitionConsumers {
 		go c.consumePartition(pc)
+		if c.Process != nil {
+			c.Process.ComponentStarted()
+			go func(pc sarama.PartitionConsumer) {
+				<-c.Process.WaitForShutdown()
+				_ = pc.Close()
+				c.Process.ComponentFinished()
+				logrus.Infof("Stopped consumer for %q topic %q", c.ComponentName, c.Topic)
+			}(pc)
+		}
 	}
 
 	return storedOffsets, nil

setup/base.go

@@ -15,22 +15,28 @@
 package setup
 
 import (
+	"context"
 	"crypto/tls"
 	"fmt"
 	"io"
 	"net"
 	"net/http"
 	"net/url"
+	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
 	"github.com/matrix-org/dendrite/internal/caching"
 	"github.com/matrix-org/dendrite/internal/httputil"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"go.uber.org/atomic"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/h2c"
 
 	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
 
 	"github.com/gorilla/mux"
@@ -61,6 +67,7 @@ import (
 // should only be used during start up.
 // Must be closed when shutting down.
 type BaseDendrite struct {
+	*process.ProcessContext
 	componentName          string
 	tracerCloser           io.Closer
 	PublicClientAPIMux     *mux.Router
@@ -161,7 +168,9 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, useHTTPAPIs boo
 	// We need to be careful with media APIs if they read from a filesystem to make sure they
 	// are not inadvertently reading paths without cleaning, else this could introduce a
 	// directory traversal attack e.g /../../../etc/passwd
+
 	return &BaseDendrite{
+		ProcessContext:         process.NewProcessContext(),
 		componentName:          componentName,
 		UseHTTPAPIs:            useHTTPAPIs,
 		tracerCloser:           closer,
@@ -354,14 +363,26 @@ func (b *BaseDendrite) SetupAndServeHTTP(
 
 	if internalAddr != NoListener && internalAddr != externalAddr {
 		go func() {
+			var internalShutdown atomic.Bool // RegisterOnShutdown can be called more than once
 			logrus.Infof("Starting internal %s listener on %s", b.componentName, internalServ.Addr)
+			b.ProcessContext.ComponentStarted()
+			internalServ.RegisterOnShutdown(func() {
+				if internalShutdown.CAS(false, true) {
+					b.ProcessContext.ComponentFinished()
+					logrus.Infof("Stopped internal HTTP listener")
+				}
+			})
 			if certFile != nil && keyFile != nil {
 				if err := internalServ.ListenAndServeTLS(*certFile, *keyFile); err != nil {
-					logrus.WithError(err).Fatal("failed to serve HTTPS")
+					if err != http.ErrServerClosed {
+						logrus.WithError(err).Fatal("failed to serve HTTPS")
+					}
 				}
 			} else {
 				if err := internalServ.ListenAndServe(); err != nil {
-					logrus.WithError(err).Fatal("failed to serve HTTP")
+					if err != http.ErrServerClosed {
+						logrus.WithError(err).Fatal("failed to serve HTTP")
+					}
 				}
 			}
 			logrus.Infof("Stopped internal %s listener on %s", b.componentName, internalServ.Addr)
@@ -370,19 +391,52 @@ func (b *BaseDendrite) SetupAndServeHTTP(
 
 	if externalAddr != NoListener {
 		go func() {
+			var externalShutdown atomic.Bool // RegisterOnShutdown can be called more than once
 			logrus.Infof("Starting external %s listener on %s", b.componentName, externalServ.Addr)
+			b.ProcessContext.ComponentStarted()
+			externalServ.RegisterOnShutdown(func() {
+				if externalShutdown.CAS(false, true) {
+					b.ProcessContext.ComponentFinished()
+					logrus.Infof("Stopped external HTTP listener")
+				}
+			})
 			if certFile != nil && keyFile != nil {
 				if err := externalServ.ListenAndServeTLS(*certFile, *keyFile); err != nil {
-					logrus.WithError(err).Fatal("failed to serve HTTPS")
+					if err != http.ErrServerClosed {
+						logrus.WithError(err).Fatal("failed to serve HTTPS")
+					}
 				}
 			} else {
 				if err := externalServ.ListenAndServe(); err != nil {
-					logrus.WithError(err).Fatal("failed to serve HTTP")
+					if err != http.ErrServerClosed {
+						logrus.WithError(err).Fatal("failed to serve HTTP")
+					}
 				}
 			}
 			logrus.Infof("Stopped external %s listener on %s", b.componentName, externalServ.Addr)
 		}()
 	}
 
-	select {}
+	<-b.ProcessContext.WaitForShutdown()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	_ = internalServ.Shutdown(ctx)
+	_ = externalServ.Shutdown(ctx)
+	logrus.Infof("Stopped HTTP listeners")
+}
+
+func (b *BaseDendrite) WaitForShutdown() {
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+	<-sigs
+	signal.Reset(syscall.SIGINT, syscall.SIGTERM)
+
+	logrus.Warnf("Shutdown signal received")
+
+	b.ProcessContext.ShutdownDendrite()
+	b.ProcessContext.WaitForComponentsToFinish()
+
+	logrus.Warnf("Dendrite is exiting now")
 }

setup/monolith.go

@@ -27,6 +27,7 @@ import (
 	"github.com/matrix-org/dendrite/mediaapi"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	serverKeyAPI "github.com/matrix-org/dendrite/signingkeyserver/api"
 	"github.com/matrix-org/dendrite/syncapi"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
@@ -56,7 +57,7 @@ type Monolith struct {
 }
 
 // AddAllPublicRoutes attaches all public paths to the given router
-func (m *Monolith) AddAllPublicRoutes(csMux, ssMux, keyMux, mediaMux *mux.Router) {
+func (m *Monolith) AddAllPublicRoutes(process *process.ProcessContext, csMux, ssMux, keyMux, mediaMux *mux.Router) {
 	clientapi.AddPublicRoutes(
 		csMux, &m.Config.ClientAPI, m.AccountDB,
 		m.FedClient, m.RoomserverAPI,
@@ -71,7 +72,7 @@ func (m *Monolith) AddAllPublicRoutes(csMux, ssMux, keyMux, mediaMux *mux.Router
 	)
 	mediaapi.AddPublicRoutes(mediaMux, &m.Config.MediaAPI, m.UserAPI, m.Client)
 	syncapi.AddPublicRoutes(
-		csMux, m.UserAPI, m.RoomserverAPI,
+		process, csMux, m.UserAPI, m.RoomserverAPI,
 		m.KeyAPI, m.FedClient, &m.Config.SyncAPI,
 	)
 }

setup/process/process.go

@@ -0,0 +1,45 @@
+package process
+
+import (
+	"context"
+	"sync"
+)
+
+type ProcessContext struct {
+	wg       *sync.WaitGroup    // used to wait for components to shutdown
+	ctx      context.Context    // cancelled when Stop is called
+	shutdown context.CancelFunc // shut down Dendrite
+}
+
+func NewProcessContext() *ProcessContext {
+	ctx, shutdown := context.WithCancel(context.Background())
+	return &ProcessContext{
+		ctx:      ctx,
+		shutdown: shutdown,
+		wg:       &sync.WaitGroup{},
+	}
+}
+
+func (b *ProcessContext) Context() context.Context {
+	return context.WithValue(b.ctx, "scope", "process") // nolint:staticcheck
+}
+
+func (b *ProcessContext) ComponentStarted() {
+	b.wg.Add(1)
+}
+
+func (b *ProcessContext) ComponentFinished() {
+	b.wg.Done()
+}
+
+func (b *ProcessContext) ShutdownDendrite() {
+	b.shutdown()
+}
+
+func (b *ProcessContext) WaitForShutdown() <-chan struct{} {
+	return b.ctx.Done()
+}
+
+func (b *ProcessContext) WaitForComponentsToFinish() {
+	b.wg.Wait()
+}

syncapi/consumers/clientapi.go

@@ -22,6 +22,7 @@ import (
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/internal/eventutil"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
@@ -38,14 +39,15 @@ type OutputClientDataConsumer struct {
 
 // NewOutputClientDataConsumer creates a new OutputClientData consumer. Call Start() to begin consuming from room servers.
 func NewOutputClientDataConsumer(
+	process *process.ProcessContext,
 	cfg *config.SyncAPI,
 	kafkaConsumer sarama.Consumer,
 	store storage.Database,
 	notifier *notifier.Notifier,
 	stream types.StreamProvider,
 ) *OutputClientDataConsumer {
-
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "syncapi/clientapi",
 		Topic:          string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputClientData)),
 		Consumer:       kafkaConsumer,

syncapi/consumers/eduserver_receipts.go

@@ -22,6 +22,7 @@ import (
 	"github.com/matrix-org/dendrite/eduserver/api"
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
@@ -39,6 +40,7 @@ type OutputReceiptEventConsumer struct {
 // NewOutputReceiptEventConsumer creates a new OutputReceiptEventConsumer.
 // Call Start() to begin consuming from the EDU server.
 func NewOutputReceiptEventConsumer(
+	process *process.ProcessContext,
 	cfg *config.SyncAPI,
 	kafkaConsumer sarama.Consumer,
 	store storage.Database,
@@ -47,6 +49,7 @@ func NewOutputReceiptEventConsumer(
 ) *OutputReceiptEventConsumer {
 
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "syncapi/eduserver/receipt",
 		Topic:          cfg.Matrix.Kafka.TopicFor(config.TopicOutputReceiptEvent),
 		Consumer:       kafkaConsumer,

syncapi/consumers/eduserver_sendtodevice.go

@@ -22,6 +22,7 @@ import (
 	"github.com/matrix-org/dendrite/eduserver/api"
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
@@ -42,6 +43,7 @@ type OutputSendToDeviceEventConsumer struct {
 // NewOutputSendToDeviceEventConsumer creates a new OutputSendToDeviceEventConsumer.
 // Call Start() to begin consuming from the EDU server.
 func NewOutputSendToDeviceEventConsumer(
+	process *process.ProcessContext,
 	cfg *config.SyncAPI,
 	kafkaConsumer sarama.Consumer,
 	store storage.Database,
@@ -50,6 +52,7 @@ func NewOutputSendToDeviceEventConsumer(
 ) *OutputSendToDeviceEventConsumer {
 
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "syncapi/eduserver/sendtodevice",
 		Topic:          string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputSendToDeviceEvent)),
 		Consumer:       kafkaConsumer,

syncapi/consumers/eduserver_typing.go

@@ -22,6 +22,7 @@ import (
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
@@ -39,6 +40,7 @@ type OutputTypingEventConsumer struct {
 // NewOutputTypingEventConsumer creates a new OutputTypingEventConsumer.
 // Call Start() to begin consuming from the EDU server.
 func NewOutputTypingEventConsumer(
+	process *process.ProcessContext,
 	cfg *config.SyncAPI,
 	kafkaConsumer sarama.Consumer,
 	store storage.Database,
@@ -48,6 +50,7 @@ func NewOutputTypingEventConsumer(
 ) *OutputTypingEventConsumer {
 
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "syncapi/eduserver/typing",
 		Topic:          string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputTypingEvent)),
 		Consumer:       kafkaConsumer,

syncapi/consumers/keychange.go

@@ -23,6 +23,7 @@ import (
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/keyserver/api"
 	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
@@ -46,6 +47,7 @@ type OutputKeyChangeEventConsumer struct {
 // NewOutputKeyChangeEventConsumer creates a new OutputKeyChangeEventConsumer.
 // Call Start() to begin consuming from the key server.
 func NewOutputKeyChangeEventConsumer(
+	process *process.ProcessContext,
 	serverName gomatrixserverlib.ServerName,
 	topic string,
 	kafkaConsumer sarama.Consumer,
@@ -57,6 +59,7 @@ func NewOutputKeyChangeEventConsumer(
 ) *OutputKeyChangeEventConsumer {
 
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "syncapi/keychange",
 		Topic:          topic,
 		Consumer:       kafkaConsumer,

syncapi/consumers/roomserver.go

@@ -23,6 +23,7 @@ import (
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/process"
 	"github.com/matrix-org/dendrite/syncapi/notifier"
 	"github.com/matrix-org/dendrite/syncapi/storage"
 	"github.com/matrix-org/dendrite/syncapi/types"
@@ -43,6 +44,7 @@ type OutputRoomEventConsumer struct {
 
 // NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
 func NewOutputRoomEventConsumer(
+	process *process.ProcessContext,
 	cfg *config.SyncAPI,
 	kafkaConsumer sarama.Consumer,
 	store storage.Database,
@@ -53,6 +55,7 @@ func NewOutputRoomEventConsumer(
 ) *OutputRoomEventConsumer {
 
 	consumer := internal.ContinualConsumer{
+		Process:        process,
 		ComponentName:  "syncapi/roomserver",
 		Topic:          string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputRoomEvent)),
 		Consumer:       kafkaConsumer,

syncapi/syncapi.go

@@ -25,6 +25,7 @@ import (
 	"github.com/matrix-org/dendrite/roomserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/dendrite/setup/kafka"
+	"github.com/matrix-org/dendrite/setup/process"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/gomatrixserverlib"
 
@@ -39,6 +40,7 @@ import (
 // AddPublicRoutes sets up and registers HTTP handlers for the SyncAPI
 // component.
 func AddPublicRoutes(
+	process *process.ProcessContext,
 	router *mux.Router,
 	userAPI userapi.UserInternalAPI,
 	rsAPI api.RoomserverInternalAPI,
@@ -63,7 +65,7 @@ func AddPublicRoutes(
 	requestPool := sync.NewRequestPool(syncDB, cfg, userAPI, keyAPI, rsAPI, streams, notifier)
 
 	keyChangeConsumer := consumers.NewOutputKeyChangeEventConsumer(
-		cfg.Matrix.ServerName, string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputKeyChangeEvent)),
+		process, cfg.Matrix.ServerName, string(cfg.Matrix.Kafka.TopicFor(config.TopicOutputKeyChangeEvent)),
 		consumer, keyAPI, rsAPI, syncDB, notifier, streams.DeviceListStreamProvider,
 	)
 	if err = keyChangeConsumer.Start(); err != nil {
@@ -71,7 +73,7 @@ func AddPublicRoutes(
 	}
 
 	roomConsumer := consumers.NewOutputRoomEventConsumer(
-		cfg, consumer, syncDB, notifier, streams.PDUStreamProvider,
+		process, cfg, consumer, syncDB, notifier, streams.PDUStreamProvider,
 		streams.InviteStreamProvider, rsAPI,
 	)
 	if err = roomConsumer.Start(); err != nil {
@@ -79,28 +81,28 @@ func AddPublicRoutes(
 	}
 
 	clientConsumer := consumers.NewOutputClientDataConsumer(
-		cfg, consumer, syncDB, notifier, streams.AccountDataStreamProvider,
+		process, cfg, consumer, syncDB, notifier, streams.AccountDataStreamProvider,
 	)
 	if err = clientConsumer.Start(); err != nil {
 		logrus.WithError(err).Panicf("failed to start client data consumer")
 	}
 
 	typingConsumer := consumers.NewOutputTypingEventConsumer(
-		cfg, consumer, syncDB, eduCache, notifier, streams.TypingStreamProvider,
+		process, cfg, consumer, syncDB, eduCache, notifier, streams.TypingStreamProvider,
 	)
 	if err = typingConsumer.Start(); err != nil {
 		logrus.WithError(err).Panicf("failed to start typing consumer")
 	}
 
 	sendToDeviceConsumer := consumers.NewOutputSendToDeviceEventConsumer(
-		cfg, consumer, syncDB, notifier, streams.SendToDeviceStreamProvider,
+		process, cfg, consumer, syncDB, notifier, streams.SendToDeviceStreamProvider,
 	)
 	if err = sendToDeviceConsumer.Start(); err != nil {
 		logrus.WithError(err).Panicf("failed to start send-to-device consumer")
 	}
 
 	receiptConsumer := consumers.NewOutputReceiptEventConsumer(
-		cfg, consumer, syncDB, notifier, streams.ReceiptStreamProvider,
+		process, cfg, consumer, syncDB, notifier, streams.ReceiptStreamProvider,
 	)
 	if err = receiptConsumer.Start(); err != nil {
 		logrus.WithError(err).Panicf("failed to start receipts consumer")