Log setup and processing times for requests

Closes #277.

internal/context.go

@@ -3,6 +3,7 @@ package internal
 import (
 	"context"
 	"fmt"
+	"time"
 
 	"github.com/getsentry/sentry-go"
 
@@ -25,6 +26,8 @@ type data struct {
 	next                 int64
 	numRooms             int
 	txnID                string
+	setupTime            time.Duration
+	processingTime       time.Duration
 	numToDeviceEvents    int
 	numGlobalAccountData int
 	numChangedDevices    int
@@ -144,3 +147,30 @@ func DecorateLogger(ctx context.Context, l *zerolog.Event) *zerolog.Event {
 	l = l.Str("c", da.connID)
 	return l
 }
+
+func SetRequestContextSetupDuration(ctx context.Context, setup time.Duration) {
+	d := ctx.Value(ctxData)
+	if d == nil {
+		return
+	}
+	da := d.(*data)
+	da.setupTime = setup
+}
+
+func SetRequestContextProcessingDuration(ctx context.Context, processing time.Duration) {
+	d := ctx.Value(ctxData)
+	if d == nil {
+		return
+	}
+	da := d.(*data)
+	da.processingTime = processing
+}
+
+func RequestContextDurations(ctx context.Context) (setup time.Duration, processing time.Duration) {
+	d := ctx.Value(ctxData)
+	if d == nil {
+		return 0, 0
+	}
+	da := d.(*data)
+	return da.setupTime, da.processingTime
+}

sync3/handler/connstate.go

@@ -183,7 +183,7 @@ func (s *ConnState) OnIncomingRequest(ctx context.Context, cid sync3.ConnID, req
 		region.End()
 	}
 	setupTime := time.Since(start)
-	s.trackSetupDuration(setupTime, isInitial)
+	s.trackSetupDuration(ctx, setupTime, isInitial)
 	return s.onIncomingRequest(ctx, req, isInitial)
 }
 
@@ -242,7 +242,7 @@ func (s *ConnState) onIncomingRequest(reqCtx context.Context, req *sync3.Request
 		// we will have tons of fast requests logged (as they get tracked and then hit live streaming)
 		// In other words, this metric tracks the time it takes to process _changes_ in the client
 		// requests (initial connection, modifying index positions, etc) which should always be fast.
-		s.trackProcessDuration(time.Since(start), isInitial)
+		s.trackProcessDuration(reqCtx, time.Since(start), isInitial)
 	}
 
 	// do live tracking if we have nothing to tell the client yet
@@ -687,7 +687,7 @@ func (s *ConnState) getInitialRoomData(ctx context.Context, roomSub sync3.RoomSu
 	return rooms
 }
 
-func (s *ConnState) trackSetupDuration(dur time.Duration, isInitial bool) {
+func (s *ConnState) trackSetupDuration(ctx context.Context, dur time.Duration, isInitial bool) {
 	if s.setupHistogramVec == nil {
 		return
 	}
@@ -696,9 +696,10 @@ func (s *ConnState) trackSetupDuration(dur time.Duration, isInitial bool) {
 		val = "1"
 	}
 	s.setupHistogramVec.WithLabelValues(val).Observe(float64(dur.Seconds()))
+	internal.SetRequestContextSetupDuration(ctx, dur)
 }
 
-func (s *ConnState) trackProcessDuration(dur time.Duration, isInitial bool) {
+func (s *ConnState) trackProcessDuration(ctx context.Context, dur time.Duration, isInitial bool) {
 	if s.processHistogramVec == nil {
 		return
 	}
@@ -707,6 +708,7 @@ func (s *ConnState) trackProcessDuration(dur time.Duration, isInitial bool) {
 		val = "1"
 	}
 	s.processHistogramVec.WithLabelValues(val).Observe(float64(dur.Seconds()))
+	internal.SetRequestContextProcessingDuration(ctx, dur)
 }
 
 // Called when the connection is torn down

v3.go

@@ -193,9 +193,14 @@ func RunSyncV3Server(h http.Handler, bindAddr, destV2Server, tlsCert, tlsKey str
 				if !strings.HasSuffix(r.URL.Path, "/sync") {
 					entry.Str("path", r.URL.Path)
 				}
+				durStr := fmt.Sprintf("%.3f", duration.Seconds())
+				setupDur, processingDur := internal.RequestContextDurations(r.Context())
+				if setupDur != 0 || processingDur != 0 {
+					durStr += fmt.Sprintf("(%.3fs+%.3fp)", setupDur.Seconds(), processingDur.Seconds())
+				}
 				entry.Int("status", status).
 					Int("size", size).
-					Dur("duration", duration).
+					Str("duration", durStr).
 					Msg("")
 			}),
 		},