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Commit869b13d

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committed
Revert to only synchronous collection; background collection is not worth the complexity
Signed-off-by: Danny Kopping <danny@coder.com>
1 parent361538c commit869b13d

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7 files changed

+62
-135
lines changed

7 files changed

+62
-135
lines changed

‎cli/server.go

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -678,7 +678,7 @@ func (r *RootCmd) Server(newAPI func(context.Context, *coderd.Options) (*coderd.
678678
}()
679679

680680
options.Database=database.New(sqlDB)
681-
ps,err:=pubsub.New(ctx,logger.Named("pubsub"),sqlDB,dbURL,pubsub.LatencyMeasureInterval)
681+
ps,err:=pubsub.New(ctx,logger.Named("pubsub"),sqlDB,dbURL)
682682
iferr!=nil {
683683
returnxerrors.Errorf("create pubsub: %w",err)
684684
}

‎coderd/database/dbtestutil/db.go

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -127,7 +127,7 @@ func NewDB(t testing.TB, opts ...Option) (database.Store, pubsub.Pubsub) {
127127
}
128128
db=database.New(sqlDB)
129129

130-
ps,err=pubsub.New(context.Background(),o.logger,sqlDB,connectionURL,pubsub.LatencyMeasureInterval)
130+
ps,err=pubsub.New(context.Background(),o.logger,sqlDB,connectionURL)
131131
require.NoError(t,err)
132132
t.Cleanup(func() {
133133
_=ps.Close()

‎coderd/database/pubsub/latency.go

Lines changed: 7 additions & 72 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,6 @@ import (
44
"bytes"
55
"context"
66
"fmt"
7-
"sync/atomic"
87
"time"
98

109
"github.com/google/uuid"
@@ -19,16 +18,6 @@ type LatencyMeasurer struct {
1918
// Create unique pubsub channel names so that multiple coderd replicas do not clash when performing latency measurements.
2019
channel uuid.UUID
2120
logger slog.Logger
22-
23-
// background measurement members
24-
collections atomic.Int64
25-
last atomic.Value
26-
asyncCancel context.CancelCauseFunc
27-
}
28-
29-
typeLatencyMeasurementstruct {
30-
Send,Recv time.Duration
31-
Errerror
3221
}
3322

3423
// LatencyMessageLength is the length of a UUIDv4 encoded to hex.
@@ -42,7 +31,7 @@ func NewLatencyMeasurer(logger slog.Logger) *LatencyMeasurer {
4231
}
4332

4433
// Measure takes a given Pubsub implementation, publishes a message & immediately receives it, and returns the observed latency.
45-
func (lm*LatencyMeasurer)Measure(ctx context.Context,pPubsub)LatencyMeasurement {
34+
func (lm*LatencyMeasurer)Measure(ctx context.Context,pPubsub)(send,recv time.Duration,errerror) {
4635
var (
4736
start time.Time
4837
res=make(chan time.Duration,1)
@@ -60,77 +49,23 @@ func (lm *LatencyMeasurer) Measure(ctx context.Context, p Pubsub) LatencyMeasure
6049
res<-time.Since(start)
6150
})
6251
iferr!=nil {
63-
returnLatencyMeasurement{Send:-1,Recv:-1,Err:xerrors.Errorf("failed to subscribe: %w",err)}
52+
return-1,-1,xerrors.Errorf("failed to subscribe: %w",err)
6453
}
6554
defercancel()
6655

6756
start=time.Now()
6857
err=p.Publish(lm.latencyChannelName(),msg)
6958
iferr!=nil {
70-
returnLatencyMeasurement{Send:-1,Recv:-1,Err:xerrors.Errorf("failed to publish: %w",err)}
59+
return-1,-1,xerrors.Errorf("failed to publish: %w",err)
7160
}
7261

73-
send:=time.Since(start)
74-
62+
send=time.Since(start)
7563
select {
7664
case<-ctx.Done():
7765
lm.logger.Error(ctx,"context canceled before message could be received",slog.Error(ctx.Err()),slog.F("msg",msg))
78-
returnLatencyMeasurement{Send:send,Recv:-1,Err:ctx.Err()}
79-
caserecv:=<-res:
80-
returnLatencyMeasurement{Send:send,Recv:recv}
81-
}
82-
}
83-
84-
// MeasureAsync runs latency measurements asynchronously on a given interval.
85-
// This function is expected to be run in a goroutine and will exit when the context is canceled.
86-
func (lm*LatencyMeasurer)MeasureAsync(ctx context.Context,pPubsub,interval time.Duration) {
87-
tick:=time.NewTicker(interval)
88-
defertick.Stop()
89-
90-
ctx,cancel:=context.WithCancelCause(ctx)
91-
lm.asyncCancel=cancel
92-
93-
for {
94-
// run immediately on first call, then sleep a tick before each invocation
95-
ifp==nil {
96-
lm.logger.Error(ctx,"given pubsub is nil")
97-
return
98-
}
99-
100-
lm.collections.Add(1)
101-
measure:=lm.Measure(ctx,p)
102-
lm.last.Store(&measure)
103-
104-
select {
105-
case<-tick.C:
106-
continue
107-
108-
// bail out if signaled
109-
case<-ctx.Done():
110-
lm.logger.Debug(ctx,"async measurement canceled",slog.Error(ctx.Err()))
111-
return
112-
}
113-
}
114-
}
115-
116-
func (lm*LatencyMeasurer)LastMeasurement()*LatencyMeasurement {
117-
val:=lm.last.Load()
118-
ifval==nil {
119-
returnnil
120-
}
121-
122-
// nolint:forcetypeassert // Unnecessary type check.
123-
returnval.(*LatencyMeasurement)
124-
}
125-
126-
func (lm*LatencyMeasurer)MeasurementCount()int64 {
127-
returnlm.collections.Load()
128-
}
129-
130-
// Stop stops any background measurements.
131-
func (lm*LatencyMeasurer)Stop() {
132-
iflm.asyncCancel!=nil {
133-
lm.asyncCancel(xerrors.New("stopped"))
66+
returnsend,-1,ctx.Err()
67+
caserecv=<-res:
68+
returnsend,recv,nil
13469
}
13570
}
13671

‎coderd/database/pubsub/pubsub.go

Lines changed: 12 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -210,8 +210,9 @@ type PGPubsub struct {
210210
disconnectionsTotal prometheus.Counter
211211
connected prometheus.Gauge
212212

213-
latencyMeasurer*LatencyMeasurer
214-
latencyErrCounter atomic.Int64
213+
latencyMeasurer*LatencyMeasurer
214+
latencyMeasureCounter atomic.Int64
215+
latencyErrCounter atomic.Int64
215216
}
216217

217218
// BufferSize is the maximum number of unhandled messages we will buffer
@@ -311,8 +312,6 @@ func (p *PGPubsub) Close() error {
311312
err:=p.closeListener()
312313
<-p.listenDone
313314
p.logger.Debug(context.Background(),"pubsub closed")
314-
p.latencyMeasurer.Stop()
315-
p.logger.Debug(context.Background(),"background latency measurement has stopped")
316315
returnerr
317316
}
318317

@@ -569,32 +568,28 @@ func (p *PGPubsub) Collect(metrics chan<- prometheus.Metric) {
569568
metrics<-prometheus.MustNewConstMetric(currentEventsDesc,prometheus.GaugeValue,float64(events))
570569

571570
// additional metrics
572-
latency:=p.latencyMeasurer.LastMeasurement()
573-
iflatency==nil {
574-
p.logger.Debug(context.Background(),"latency measurement not completed yet")
575-
return
576-
}
571+
ctx,cancel:=context.WithTimeout(context.Background(),LatencyMeasureInterval)
572+
defercancel()
573+
send,recv,err:=p.latencyMeasurer.Measure(ctx,p)
577574

578-
metrics<-prometheus.MustNewConstMetric(pubsubLatencyMeasureCountDesc,prometheus.CounterValue,float64(p.latencyMeasurer.MeasurementCount()))
579-
iflatency.Err!=nil {
580-
p.logger.Warn(context.Background(),"failed to measure latency",slog.Error(latency.Err))
575+
metrics<-prometheus.MustNewConstMetric(pubsubLatencyMeasureCountDesc,prometheus.CounterValue,float64(p.latencyMeasureCounter.Add(1)))
576+
iferr!=nil {
577+
p.logger.Warn(context.Background(),"failed to measure latency",slog.Error(err))
581578
metrics<-prometheus.MustNewConstMetric(pubsubLatencyMeasureErrDesc,prometheus.CounterValue,float64(p.latencyErrCounter.Add(1)))
582579
return
583580
}
584-
metrics<-prometheus.MustNewConstMetric(pubsubSendLatencyDesc,prometheus.GaugeValue,latency.Send.Seconds())
585-
metrics<-prometheus.MustNewConstMetric(pubsubRecvLatencyDesc,prometheus.GaugeValue,latency.Recv.Seconds())
581+
metrics<-prometheus.MustNewConstMetric(pubsubSendLatencyDesc,prometheus.GaugeValue,send.Seconds())
582+
metrics<-prometheus.MustNewConstMetric(pubsubRecvLatencyDesc,prometheus.GaugeValue,recv.Seconds())
586583
}
587584

588585
// New creates a new Pubsub implementation using a PostgreSQL connection.
589-
funcNew(startCtx context.Context,logger slog.Logger,database*sql.DB,connectURLstring,latencyMeasureInterval time.Duration) (*PGPubsub,error) {
586+
funcNew(startCtx context.Context,logger slog.Logger,database*sql.DB,connectURLstring) (*PGPubsub,error) {
590587
p:=newWithoutListener(logger,database)
591588
iferr:=p.startListener(startCtx,connectURL);err!=nil {
592589
returnnil,err
593590
}
594591
gop.listen()
595592
logger.Info(startCtx,"pubsub has started")
596-
gop.latencyMeasurer.MeasureAsync(startCtx,p,latencyMeasureInterval)
597-
logger.Debug(startCtx,"background latency measurement has started")
598593
returnp,nil
599594
}
600595

‎coderd/database/pubsub/pubsub_linux_test.go

Lines changed: 18 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -45,7 +45,7 @@ func TestPubsub(t *testing.T) {
4545
db,err:=sql.Open("postgres",connectionURL)
4646
require.NoError(t,err)
4747
deferdb.Close()
48-
pubsub,err:=pubsub.New(ctx,logger,db,connectionURL,pubsub.LatencyMeasureInterval)
48+
pubsub,err:=pubsub.New(ctx,logger,db,connectionURL)
4949
require.NoError(t,err)
5050
deferpubsub.Close()
5151
event:="test"
@@ -74,7 +74,7 @@ func TestPubsub(t *testing.T) {
7474
db,err:=sql.Open("postgres",connectionURL)
7575
require.NoError(t,err)
7676
deferdb.Close()
77-
pubsub,err:=pubsub.New(ctx,logger,db,connectionURL,pubsub.LatencyMeasureInterval)
77+
pubsub,err:=pubsub.New(ctx,logger,db,connectionURL)
7878
require.NoError(t,err)
7979
deferpubsub.Close()
8080
cancelFunc()
@@ -90,7 +90,7 @@ func TestPubsub(t *testing.T) {
9090
db,err:=sql.Open("postgres",connectionURL)
9191
require.NoError(t,err)
9292
deferdb.Close()
93-
pubsub,err:=pubsub.New(ctx,logger,db,connectionURL,pubsub.LatencyMeasureInterval)
93+
pubsub,err:=pubsub.New(ctx,logger,db,connectionURL)
9494
require.NoError(t,err)
9595
deferpubsub.Close()
9696

@@ -127,7 +127,7 @@ func TestPubsub_ordering(t *testing.T) {
127127
db,err:=sql.Open("postgres",connectionURL)
128128
require.NoError(t,err)
129129
deferdb.Close()
130-
ps,err:=pubsub.New(ctx,logger,db,connectionURL,pubsub.LatencyMeasureInterval)
130+
ps,err:=pubsub.New(ctx,logger,db,connectionURL)
131131
require.NoError(t,err)
132132
deferps.Close()
133133
event:="test"
@@ -176,7 +176,7 @@ func TestPubsub_Disconnect(t *testing.T) {
176176
ctx,cancelFunc:=context.WithTimeout(context.Background(),testutil.WaitSuperLong)
177177
defercancelFunc()
178178
logger:=slogtest.Make(t,&slogtest.Options{IgnoreErrors:true}).Leveled(slog.LevelDebug)
179-
ps,err:=pubsub.New(ctx,logger,db,connectionURL,pubsub.LatencyMeasureInterval)
179+
ps,err:=pubsub.New(ctx,logger,db,connectionURL)
180180
require.NoError(t,err)
181181
deferps.Close()
182182
event:="test"
@@ -308,7 +308,7 @@ func TestMeasureLatency(t *testing.T) {
308308
require.NoError(t,err)
309309
db,err:=sql.Open("postgres",connectionURL)
310310
require.NoError(t,err)
311-
ps,err:=pubsub.New(ctx,logger,db,connectionURL,pubsub.LatencyMeasureInterval)
311+
ps,err:=pubsub.New(ctx,logger,db,connectionURL)
312312
require.NoError(t,err)
313313

314314
returnps,func() {
@@ -329,10 +329,10 @@ func TestMeasureLatency(t *testing.T) {
329329
ctx,cancel:=context.WithTimeout(context.Background(),testutil.WaitShort)
330330
defercancel()
331331

332-
l:=pubsub.NewLatencyMeasurer(logger).Measure(ctx,ps)
333-
require.NoError(t,l.Err)
334-
require.Greater(t,l.Send.Seconds(),0.0)
335-
require.Greater(t,l.Recv.Seconds(),0.0)
332+
send,recv,err:=pubsub.NewLatencyMeasurer(logger).Measure(ctx,ps)
333+
require.NoError(t,err)
334+
require.Greater(t,send.Seconds(),0.0)
335+
require.Greater(t,recv.Seconds(),0.0)
336336
})
337337

338338
t.Run("MeasureLatencyRecvTimeout",func(t*testing.T) {
@@ -345,10 +345,10 @@ func TestMeasureLatency(t *testing.T) {
345345
ctx,cancel:=context.WithDeadline(context.Background(),time.Now().Add(-time.Hour))
346346
defercancel()
347347

348-
l:=pubsub.NewLatencyMeasurer(logger).Measure(ctx,ps)
349-
require.ErrorContains(t,l.Err,context.DeadlineExceeded.Error())
350-
require.Greater(t,l.Send.Seconds(),0.0)
351-
require.EqualValues(t,l.Recv,time.Duration(-1))
348+
send,recv,err:=pubsub.NewLatencyMeasurer(logger).Measure(ctx,ps)
349+
require.ErrorContains(t,err,context.DeadlineExceeded.Error())
350+
require.Greater(t,send.Seconds(),0.0)
351+
require.EqualValues(t,recv,time.Duration(-1))
352352
})
353353

354354
t.Run("MeasureLatencyNotifyRace",func(t*testing.T) {
@@ -366,10 +366,10 @@ func TestMeasureLatency(t *testing.T) {
366366
ctx,cancel:=context.WithTimeout(context.Background(),testutil.WaitShort)
367367
defercancel()
368368

369-
l:=lm.Measure(ctx,racy)
370-
assert.NoError(t,l.Err)
371-
assert.Greater(t,l.Send.Seconds(),0.0)
372-
assert.Greater(t,l.Recv.Seconds(),0.0)
369+
send,recv,err:=lm.Measure(ctx,racy)
370+
assert.NoError(t,err)
371+
assert.Greater(t,send.Seconds(),0.0)
372+
assert.Greater(t,recv.Seconds(),0.0)
373373

374374
logger.Sync()
375375
assert.Contains(t,buf.String(),"received unexpected message")

‎coderd/database/pubsub/pubsub_test.go

Lines changed: 21 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,6 @@ import (
44
"context"
55
"database/sql"
66
"testing"
7-
"time"
87

98
"github.com/prometheus/client_golang/prometheus"
109
"github.com/stretchr/testify/assert"
@@ -33,16 +32,18 @@ func TestPGPubsub_Metrics(t *testing.T) {
3332
registry:=prometheus.NewRegistry()
3433
ctx:=testutil.Context(t,testutil.WaitLong)
3534

36-
latencyMeasureInterval:=time.Second
37-
start:=time.Now()
38-
uut,err:=pubsub.New(ctx,logger,db,connectionURL,latencyMeasureInterval)
35+
uut,err:=pubsub.New(ctx,logger,db,connectionURL)
3936
require.NoError(t,err)
4037
deferuut.Close()
4138

4239
err=registry.Register(uut)
4340
require.NoError(t,err)
4441

42+
// each Gather measures pubsub latency by publishing a message & subscribing to it
43+
vargatherCountfloat64
44+
4545
metrics,err:=registry.Gather()
46+
gatherCount++
4647
require.NoError(t,err)
4748
require.True(t,testutil.PromGaugeHasValue(t,metrics,0,"coder_pubsub_current_events"))
4849
require.True(t,testutil.PromGaugeHasValue(t,metrics,0,"coder_pubsub_current_subscribers"))
@@ -62,24 +63,21 @@ func TestPGPubsub_Metrics(t *testing.T) {
6263
_=testutil.RequireRecvCtx(ctx,t,messageChannel)
6364

6465
require.Eventually(t,func()bool {
66+
latencyBytes:=gatherCount*pubsub.LatencyMessageLength
6567
metrics,err=registry.Gather()
68+
gatherCount++
6669
assert.NoError(t,err)
67-
68-
latencyMeasurements:= (time.Since(start).Truncate(latencyMeasureInterval).Seconds()/latencyMeasureInterval.Seconds())+1
69-
t.Log(latencyMeasurements)
70-
latencyMsgSize:=pubsub.LatencyMessageLength*latencyMeasurements
71-
7270
returntestutil.PromGaugeHasValue(t,metrics,1,"coder_pubsub_current_events")&&
7371
testutil.PromGaugeHasValue(t,metrics,1,"coder_pubsub_current_subscribers")&&
7472
testutil.PromGaugeHasValue(t,metrics,1,"coder_pubsub_connected")&&
75-
testutil.PromCounterHasValue(t,metrics,1+latencyMeasurements,"coder_pubsub_publishes_total","true")&&
76-
testutil.PromCounterHasValue(t,metrics,1+latencyMeasurements,"coder_pubsub_subscribes_total","true")&&
77-
testutil.PromCounterHasValue(t,metrics,1+latencyMeasurements,"coder_pubsub_messages_total","normal")&&
78-
testutil.PromCounterHasValue(t,metrics,float64(len(data))+latencyMsgSize,"coder_pubsub_received_bytes_total")&&
79-
testutil.PromCounterHasValue(t,metrics,float64(len(data))+latencyMsgSize,"coder_pubsub_published_bytes_total")&&
73+
testutil.PromCounterHasValue(t,metrics,gatherCount,"coder_pubsub_publishes_total","true")&&
74+
testutil.PromCounterHasValue(t,metrics,gatherCount,"coder_pubsub_subscribes_total","true")&&
75+
testutil.PromCounterHasValue(t,metrics,gatherCount,"coder_pubsub_messages_total","normal")&&
76+
testutil.PromCounterHasValue(t,metrics,float64(len(data))+latencyBytes,"coder_pubsub_received_bytes_total")&&
77+
testutil.PromCounterHasValue(t,metrics,float64(len(data))+latencyBytes,"coder_pubsub_published_bytes_total")&&
8078
testutil.PromGaugeAssertion(t,metrics,func(infloat64)bool {returnin>0 },"coder_pubsub_send_latency_seconds")&&
8179
testutil.PromGaugeAssertion(t,metrics,func(infloat64)bool {returnin>0 },"coder_pubsub_receive_latency_seconds")&&
82-
testutil.PromCounterHasValue(t,metrics,latencyMeasurements,"coder_pubsub_latency_measures_total")&&
80+
testutil.PromCounterHasValue(t,metrics,gatherCount,"coder_pubsub_latency_measures_total")&&
8381
!testutil.PromCounterGathered(t,metrics,"coder_pubsub_latency_measure_errs_total")
8482
},testutil.WaitShort,testutil.IntervalFast)
8583

@@ -102,25 +100,22 @@ func TestPGPubsub_Metrics(t *testing.T) {
102100
_=testutil.RequireRecvCtx(ctx,t,messageChannel)
103101

104102
require.Eventually(t,func()bool {
103+
latencyBytes:=gatherCount*pubsub.LatencyMessageLength
105104
metrics,err=registry.Gather()
105+
gatherCount++
106106
assert.NoError(t,err)
107-
108-
latencyMeasurements:= (time.Since(start).Truncate(latencyMeasureInterval).Seconds()/latencyMeasureInterval.Seconds())+1
109-
latencyMsgSize:=pubsub.LatencyMessageLength*latencyMeasurements
110-
t.Log(latencyMeasurements)
111-
112107
returntestutil.PromGaugeHasValue(t,metrics,1,"coder_pubsub_current_events")&&
113108
testutil.PromGaugeHasValue(t,metrics,2,"coder_pubsub_current_subscribers")&&
114109
testutil.PromGaugeHasValue(t,metrics,1,"coder_pubsub_connected")&&
115-
testutil.PromCounterHasValue(t,metrics,2+latencyMeasurements,"coder_pubsub_publishes_total","true")&&
116-
testutil.PromCounterHasValue(t,metrics,2+latencyMeasurements,"coder_pubsub_subscribes_total","true")&&
117-
testutil.PromCounterHasValue(t,metrics,1+latencyMeasurements,"coder_pubsub_messages_total","normal")&&
110+
testutil.PromCounterHasValue(t,metrics,1+gatherCount,"coder_pubsub_publishes_total","true")&&
111+
testutil.PromCounterHasValue(t,metrics,1+gatherCount,"coder_pubsub_subscribes_total","true")&&
112+
testutil.PromCounterHasValue(t,metrics,gatherCount,"coder_pubsub_messages_total","normal")&&
118113
testutil.PromCounterHasValue(t,metrics,1,"coder_pubsub_messages_total","colossal")&&
119-
testutil.PromCounterHasValue(t,metrics,float64(colossalSize+len(data))+latencyMsgSize,"coder_pubsub_received_bytes_total")&&
120-
testutil.PromCounterHasValue(t,metrics,float64(colossalSize+len(data))+latencyMsgSize,"coder_pubsub_published_bytes_total")&&
114+
testutil.PromCounterHasValue(t,metrics,float64(colossalSize+len(data))+latencyBytes,"coder_pubsub_received_bytes_total")&&
115+
testutil.PromCounterHasValue(t,metrics,float64(colossalSize+len(data))+latencyBytes,"coder_pubsub_published_bytes_total")&&
121116
testutil.PromGaugeAssertion(t,metrics,func(infloat64)bool {returnin>0 },"coder_pubsub_send_latency_seconds")&&
122117
testutil.PromGaugeAssertion(t,metrics,func(infloat64)bool {returnin>0 },"coder_pubsub_receive_latency_seconds")&&
123-
testutil.PromCounterHasValue(t,metrics,latencyMeasurements,"coder_pubsub_latency_measures_total")&&
118+
testutil.PromCounterHasValue(t,metrics,gatherCount,"coder_pubsub_latency_measures_total")&&
124119
!testutil.PromCounterGathered(t,metrics,"coder_pubsub_latency_measure_errs_total")
125120
},testutil.WaitShort,testutil.IntervalFast)
126121
}

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