Add Prometheus metrics

Closes #197

Co-authored-by: haywo <haywo@nct08.de>

config/config.go

@@ -61,6 +61,11 @@ type Config struct {
 		HSToken string `yaml:"hs_token"`
 	} `yaml:"appservice"`
 
+	Metrics struct {
+		Enabled bool   `yaml:"enabled"`
+		Listen  string `yaml:"listen"`
+	} `yaml:"metrics"`
+
 	Bridge BridgeConfig `yaml:"bridge"`
 
 	Logging appservice.LogConfig `yaml:"logging"`

example-config.yaml

@@ -49,6 +49,12 @@ appservice:
     as_token: "This value is generated when generating the registration"
     hs_token: "This value is generated when generating the registration"
 
+metrics:
+    # Whether or not to enable prometheus metrics
+    enabled: false
+    # IP and port where the metrics listener should be. The path is always /metrics
+    listen: 127.0.0.1:8001
+
 # Bridge config
 bridge:
     # Localpart template of MXIDs for WhatsApp users.

go.mod

@@ -15,7 +15,8 @@ require (
 	gopkg.in/yaml.v2 v2.3.0
 	maunium.net/go/mauflag v1.0.0
 	maunium.net/go/maulogger/v2 v2.1.1
-	maunium.net/go/mautrix v0.5.0
+	maunium.net/go/mautrix v0.5.1
+	github.com/prometheus/client_golang v1.6.0
 )
 
-replace github.com/Rhymen/go-whatsapp => github.com/tulir/go-whatsapp v0.2.8
+replace github.com/Rhymen/go-whatsapp => github.com/tulir/go-whatsapp v0.3.0

go.sum

@@ -1,29 +1,107 @@
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main.go

@@ -18,6 +18,7 @@ package main
 
 import (
 	"fmt"
+	"net/http"
 	"os"
 	"os/signal"
 	"strings"
@@ -37,6 +38,8 @@ import (
 	"maunium.net/go/mautrix-whatsapp/database"
 	"maunium.net/go/mautrix-whatsapp/database/upgrades"
 	"maunium.net/go/mautrix-whatsapp/types"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 var (
@@ -45,6 +48,7 @@ var (
 	URL  = "https://github.com/tulir/mautrix-whatsapp"
 	// This is changed when making a release
 	Version   = "0.1.1"
+	// This is filled by init()
 	WAVersion = ""
 	// These are filled at build time with the -X linker flag
 	Tag       = "unknown"
@@ -75,19 +79,19 @@ var wantHelp, _ = flag.MakeHelpFlag()
 func (bridge *Bridge) GenerateRegistration() {
 	reg, err := bridge.Config.NewRegistration()
 	if err != nil {
-		fmt.Fprintln(os.Stderr, "Failed to generate registration:", err)
+		_, _ = fmt.Fprintln(os.Stderr, "Failed to generate registration:", err)
 		os.Exit(20)
 	}
 
 	err = reg.Save(*registrationPath)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, "Failed to save registration:", err)
+		_, _ = fmt.Fprintln(os.Stderr, "Failed to save registration:", err)
 		os.Exit(21)
 	}
 
 	err = bridge.Config.Save(*configPath)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, "Failed to save config:", err)
+		_, _ = fmt.Fprintln(os.Stderr, "Failed to save config:", err)
 		os.Exit(22)
 	}
 	fmt.Println("Registration generated. Add the path to the registration to your Synapse config, restart it, then start the bridge.")
@@ -133,6 +137,7 @@ type Bridge struct {
 	Formatter      *Formatter
 	Relaybot       *User
 	Crypto         Crypto
+	Metrics *MetricsHandler
 
 	usersByMXID         map[id.UserID]*User
 	usersByJID          map[types.WhatsAppID]*User
@@ -170,7 +175,7 @@ func NewBridge() *Bridge {
 	var err error
 	bridge.Config, err = config.Load(*configPath)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, "Failed to load config:", err)
+		_, _ = fmt.Fprintln(os.Stderr, "Failed to load config:", err)
 		os.Exit(10)
 	}
 	return bridge
@@ -252,6 +257,7 @@ func (bridge *Bridge) Init() {
 	bridge.MatrixHandler = NewMatrixHandler(bridge)
 	bridge.Formatter = NewFormatter(bridge)
 	bridge.Crypto = NewCryptoHelper(bridge)
+	bridge.Metrics = NewMetricsHandler(bridge.Config.Metrics.Listen, bridge.Log.Sub("Metrics"), bridge.DB)
 }
 
 func (bridge *Bridge) Start() {
@@ -283,6 +289,9 @@ func (bridge *Bridge) Start() {
 		go bridge.Crypto.Start()
 	}
 	go bridge.StartUsers()
+	if bridge.Config.Metrics.Enabled {
+		go bridge.Metrics.Start()
+	}
 
 	if bridge.Config.Bridge.ResendBridgeInfo {
 		go bridge.ResendBridgeInfo()
@@ -367,6 +376,7 @@ func (bridge *Bridge) Stop() {
 		bridge.Crypto.Stop()
 	}
 	bridge.AS.Stop()
+	bridge.Metrics.Stop()
 	bridge.EventProcessor.Stop()
 	for _, user := range bridge.usersByJID {
 		if user.Conn == nil {
@@ -396,6 +406,9 @@ func (bridge *Bridge) Main() {
 	bridge.Start()
 	bridge.Log.Infoln("Bridge started!")
 
+	http.Handle("/metrics", promhttp.Handler())
+	http.ListenAndServe("127.0.0.1:9093", nil)
+
 	c := make(chan os.Signal)
 	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
 	<-c
@@ -412,7 +425,7 @@ func main() {
 		"mautrix-whatsapp [-h] [-c <path>] [-r <path>] [-g] [--migrate-db <source type> <source uri>]")
 	err := flag.Parse()
 	if err != nil {
-		fmt.Fprintln(os.Stderr, err)
+		_, _ = fmt.Fprintln(os.Stderr, err)
 		flag.PrintHelp()
 		os.Exit(1)
 	} else if *wantHelp {

matrix.go

@@ -55,6 +55,7 @@ func NewMatrixHandler(bridge *Bridge) *MatrixHandler {
 }
 
 func (mx *MatrixHandler) HandleEncryption(evt *event.Event) {
+	defer mx.bridge.Metrics.TrackEvent(evt.Type)()
 	if evt.Content.AsEncryption().Algorithm != id.AlgorithmMegolmV1 {
 		return
 	}
@@ -132,6 +133,7 @@ func (mx *MatrixHandler) HandleMembership(evt *event.Event) {
 	if _, isPuppet := mx.bridge.ParsePuppetMXID(evt.Sender); evt.Sender == mx.bridge.Bot.UserID || isPuppet {
 		return
 	}
+	defer mx.bridge.Metrics.TrackEvent(evt.Type)()
 
 	if mx.bridge.Crypto != nil {
 		mx.bridge.Crypto.HandleMemberEvent(evt)
@@ -170,6 +172,7 @@ func (mx *MatrixHandler) HandleMembership(evt *event.Event) {
 }
 
 func (mx *MatrixHandler) HandleRoomMetadata(evt *event.Event) {
+	defer mx.bridge.Metrics.TrackEvent(evt.Type)()
 	user := mx.bridge.GetUserByMXID(evt.Sender)
 	if user == nil || !user.Whitelisted || !user.IsConnected() {
 		return
@@ -214,6 +217,7 @@ func (mx *MatrixHandler) shouldIgnoreEvent(evt *event.Event) bool {
 }
 
 func (mx *MatrixHandler) HandleEncrypted(evt *event.Event) {
+	defer mx.bridge.Metrics.TrackEvent(evt.Type)()
 	if mx.shouldIgnoreEvent(evt) || mx.bridge.Crypto == nil {
 		return
 	}
@@ -227,6 +231,7 @@ func (mx *MatrixHandler) HandleEncrypted(evt *event.Event) {
 }
 
 func (mx *MatrixHandler) HandleMessage(evt *event.Event) {
+	defer mx.bridge.Metrics.TrackEvent(evt.Type)()
 	if mx.shouldIgnoreEvent(evt) {
 		return
 	}
@@ -252,6 +257,7 @@ func (mx *MatrixHandler) HandleMessage(evt *event.Event) {
 }
 
 func (mx *MatrixHandler) HandleRedaction(evt *event.Event) {
+	defer mx.bridge.Metrics.TrackEvent(evt.Type)()
 	if _, isPuppet := mx.bridge.ParsePuppetMXID(evt.Sender); evt.Sender == mx.bridge.Bot.UserID || isPuppet {
 		return
 	}

metrics.go

@@ -0,0 +1,188 @@
+// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
+// Copyright (C) 2020 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"context"
+	"net/http"
+	"runtime/debug"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	log "maunium.net/go/maulogger/v2"
+	"maunium.net/go/mautrix/event"
+
+	"maunium.net/go/mautrix-whatsapp/database"
+)
+
+type MetricsHandler struct {
+	db     *database.Database
+	server *http.Server
+	log    log.Logger
+
+	running      bool
+	ctx          context.Context
+	stopRecorder func()
+
+	messageHandling         *prometheus.HistogramVec
+	countCollection         prometheus.Histogram
+	puppetCount             prometheus.Gauge
+	userCount               prometheus.Gauge
+	messageCount            prometheus.Gauge
+	portalCount             *prometheus.GaugeVec
+	encryptedGroupCount     prometheus.Gauge
+	encryptedPrivateCount   prometheus.Gauge
+	unencryptedGroupCount   prometheus.Gauge
+	unencryptedPrivateCount prometheus.Gauge
+}
+
+func NewMetricsHandler(address string, log log.Logger, db *database.Database) *MetricsHandler {
+	portalCount := promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "whatsapp_portals_total",
+		Help: "Number of portal rooms on Matrix",
+	}, []string{"type", "encrypted"})
+	return &MetricsHandler{
+		db:      db,
+		server:  &http.Server{Addr: address, Handler: promhttp.Handler()},
+		log:     log,
+		running: false,
+
+		messageHandling: promauto.NewHistogramVec(prometheus.HistogramOpts{
+			Name: "matrix_event",
+			Help: "Time spent processing Matrix events",
+		}, []string{"event_type"}),
+		countCollection: promauto.NewHistogram(prometheus.HistogramOpts{
+			Name: "whatsapp_count_collection",
+			Help: "Time spent collecting the whatsapp_*_total metrics",
+		}),
+		puppetCount: promauto.NewGauge(prometheus.GaugeOpts{
+			Name: "whatsapp_puppets_total",
+			Help: "Number of WhatsApp users bridged into Matrix",
+		}),
+		userCount: promauto.NewGauge(prometheus.GaugeOpts{
+			Name: "whatsapp_users_total",
+			Help: "Number of Matrix users using the bridge",
+		}),
+		messageCount: promauto.NewGauge(prometheus.GaugeOpts{
+			Name: "whatsapp_messages_total",
+			Help: "Number of messages bridged",
+		}),
+		portalCount:             portalCount,
+		encryptedGroupCount:     portalCount.With(prometheus.Labels{"type": "group", "encrypted": "true"}),
+		encryptedPrivateCount:   portalCount.With(prometheus.Labels{"type": "private", "encrypted": "true"}),
+		unencryptedGroupCount:   portalCount.With(prometheus.Labels{"type": "group", "encrypted": "false"}),
+		unencryptedPrivateCount: portalCount.With(prometheus.Labels{"type": "private", "encrypted": "false"}),
+	}
+}
+
+func (mh *MetricsHandler) TrackEvent(eventType event.Type) func() {
+	start := time.Now()
+	return func() {
+		duration := time.Now().Sub(start)
+		mh.messageHandling.
+			With(prometheus.Labels{"event_type": eventType.Type}).
+			Observe(duration.Seconds())
+	}
+}
+
+func (mh *MetricsHandler) updateStats() {
+	start := time.Now()
+	var puppetCount int
+	err := mh.db.QueryRowContext(mh.ctx, "SELECT COUNT(*) FROM puppet").Scan(&puppetCount)
+	if err != nil {
+		mh.log.Warnln("Failed to scan number of puppets:", err)
+	} else {
+		mh.puppetCount.Set(float64(puppetCount))
+	}
+
+	var userCount int
+	err = mh.db.QueryRowContext(mh.ctx, `SELECT COUNT(*) FROM "user"`).Scan(&userCount)
+	if err != nil {
+		mh.log.Warnln("Failed to scan number of users:", err)
+	} else {
+		mh.userCount.Set(float64(userCount))
+	}
+
+	var messageCount int
+	err = mh.db.QueryRowContext(mh.ctx, "SELECT COUNT(*) FROM message").Scan(&messageCount)
+	if err != nil {
+		mh.log.Warnln("Failed to scan number of messages:", err)
+	} else {
+		mh.messageCount.Set(float64(messageCount))
+	}
+
+	var encryptedGroupCount, encryptedPrivateCount, unencryptedGroupCount, unencryptedPrivateCount int
+	err = mh.db.QueryRowContext(mh.ctx, `
+			SELECT
+				COUNT(CASE WHEN jid LIKE '%@g.us' AND encrypted THEN 1 END) AS encrypted_group_portals,
+				COUNT(CASE WHEN jid LIKE '%@s.whatsapp.net' AND encrypted THEN 1 END) AS encrypted_private_portals,
+				COUNT(CASE WHEN jid LIKE '%@g.us' AND NOT encrypted THEN 1 END) AS unencrypted_group_portals,
+				COUNT(CASE WHEN jid LIKE '%@s.whatsapp.net' AND NOT encrypted THEN 1 END) AS unencrypted_private_portals
+			FROM portal WHERE mxid<>''
+		`).Scan(&encryptedGroupCount, &encryptedPrivateCount, &unencryptedGroupCount, &unencryptedPrivateCount)
+	if err != nil {
+		mh.log.Warnln("Failed to scan number of portals:", err)
+	} else {
+		mh.encryptedGroupCount.Set(float64(encryptedGroupCount))
+		mh.encryptedPrivateCount.Set(float64(encryptedPrivateCount))
+		mh.unencryptedGroupCount.Set(float64(unencryptedGroupCount))
+		mh.unencryptedPrivateCount.Set(float64(encryptedPrivateCount))
+	}
+	mh.countCollection.Observe(time.Now().Sub(start).Seconds())
+}
+
+func (mh *MetricsHandler) startUpdatingStats() {
+	defer func() {
+		err := recover()
+		if err != nil {
+			mh.log.Fatalfln("Panic in metric updater: %v\n%s", err, string(debug.Stack()))
+		}
+	}()
+	ticker := time.Tick(10 * time.Second)
+	for {
+		mh.updateStats()
+		select {
+		case <-mh.ctx.Done():
+			return
+		case <-ticker:
+		}
+	}
+}
+
+func (mh *MetricsHandler) Start() {
+	mh.running = true
+	mh.ctx, mh.stopRecorder = context.WithCancel(context.Background())
+	go mh.startUpdatingStats()
+	err := mh.server.ListenAndServe()
+	mh.running = false
+	if err != nil {
+		mh.log.Fatalln("Error in metrics listener:", err)
+	}
+}
+
+func (mh *MetricsHandler) Stop() {
+	if !mh.running {
+		return
+	}
+	mh.stopRecorder()
+	err := mh.server.Close()
+	if err != nil {
+		mh.log.Errorln("Error closing metrics listener:", err)
+	}
+}