File size: 4,575 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | // Copyright 2025 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package trace_test
import (
"bytes"
inttrace "internal/trace"
"internal/trace/testtrace"
"io"
"runtime"
"runtime/trace"
"slices"
"testing"
)
func TestSubscribers(t *testing.T) {
validate := func(t *testing.T, source string, tr []byte) {
t.Log("validating", source)
defer func() {
if t.Failed() {
testtrace.Dump(t, "TestSubscribers."+source, tr, *dumpTraces)
}
}()
// Prepare to read the trace snapshot.
r, err := inttrace.NewReader(bytes.NewReader(tr))
if err != nil {
t.Errorf("unexpected error creating trace reader for %s: %v", source, err)
return
}
v := testtrace.NewValidator()
// These platforms can't guarantee a monotonically increasing clock reading in a short trace.
if runtime.GOOS == "windows" || runtime.GOARCH == "wasm" {
v.SkipClockSnapshotChecks()
}
// Make sure there are Sync events: at the start and end.
var syncs []int
evs := 0
for {
ev, err := r.ReadEvent()
if err == io.EOF {
break
}
if err != nil {
t.Errorf("unexpected error reading trace for %s: %v", source, err)
break
}
if err := v.Event(ev); err != nil {
t.Errorf("event validation failed: %s", err)
break
}
if ev.Kind() == inttrace.EventSync {
syncs = append(syncs, evs)
}
evs++
}
if !t.Failed() {
ends := []int{syncs[0], syncs[len(syncs)-1]}
if wantEnds := []int{0, evs - 1}; !slices.Equal(wantEnds, ends) {
t.Errorf("expected a sync event at each end of the trace, found sync events at %d instead of %d for %s",
ends, wantEnds, source)
}
}
}
validateTraces := func(t *testing.T, trace, frTrace *bytes.Buffer) {
validate(t, "tracer", trace.Bytes())
validate(t, "flightRecorder", frTrace.Bytes())
}
startFlightRecorder := func(t *testing.T) *trace.FlightRecorder {
fr := trace.NewFlightRecorder(trace.FlightRecorderConfig{})
if err := fr.Start(); err != nil {
t.Fatalf("unexpected error creating flight recorder: %v", err)
}
return fr
}
startTrace := func(t *testing.T, w io.Writer) {
if err := trace.Start(w); err != nil {
t.Fatalf("unexpected error starting flight recorder: %v", err)
}
}
stopFlightRecorder := func(t *testing.T, fr *trace.FlightRecorder, w io.Writer) {
if _, err := fr.WriteTo(w); err != nil {
t.Fatalf("unexpected error writing trace from flight recorder: %v", err)
}
fr.Stop()
}
stopTrace := func() {
trace.Stop()
}
t.Run("start(flight)_start(trace)_stop(trace)_stop(flight)", func(t *testing.T) {
if trace.IsEnabled() {
t.Skip("skipping because trace is already enabled")
}
frBuf := new(bytes.Buffer)
tBuf := new(bytes.Buffer)
fr := startFlightRecorder(t)
defer fr.Stop()
startTrace(t, tBuf)
defer trace.Stop()
stopTrace()
stopFlightRecorder(t, fr, frBuf)
validateTraces(t, tBuf, frBuf)
})
t.Run("start(trace)_start(flight)_stop(trace)_stop(flight)", func(t *testing.T) {
if trace.IsEnabled() {
t.Skip("skipping because trace is already enabled")
}
frBuf := new(bytes.Buffer)
tBuf := new(bytes.Buffer)
startTrace(t, tBuf)
defer trace.Stop()
fr := startFlightRecorder(t)
defer fr.Stop()
stopTrace()
stopFlightRecorder(t, fr, frBuf)
validateTraces(t, tBuf, frBuf)
})
t.Run("start(flight)_stop(flight)_start(trace)_stop(trace)", func(t *testing.T) {
if trace.IsEnabled() {
t.Skip("skipping because trace is already enabled")
}
frBuf := new(bytes.Buffer)
tBuf := new(bytes.Buffer)
fr := startFlightRecorder(t)
defer fr.Stop()
stopFlightRecorder(t, fr, frBuf)
startTrace(t, tBuf)
defer trace.Stop()
stopTrace()
validateTraces(t, tBuf, frBuf)
})
t.Run("start(flight)_stop(flight)_start(trace)_stop(trace)", func(t *testing.T) {
if trace.IsEnabled() {
t.Skip("skipping because trace is already enabled")
}
frBuf := new(bytes.Buffer)
tBuf := new(bytes.Buffer)
fr := startFlightRecorder(t)
defer fr.Stop()
stopFlightRecorder(t, fr, frBuf)
startTrace(t, tBuf)
defer trace.Stop()
stopTrace()
validateTraces(t, tBuf, frBuf)
})
t.Run("start(flight)_start(trace)_stop(flight)_stop(trace)", func(t *testing.T) {
if trace.IsEnabled() {
t.Skip("skipping because trace is already enabled")
}
frBuf := new(bytes.Buffer)
tBuf := new(bytes.Buffer)
fr := startFlightRecorder(t)
defer fr.Stop()
startTrace(t, tBuf)
defer trace.Stop()
stopFlightRecorder(t, fr, frBuf)
stopTrace()
validateTraces(t, tBuf, frBuf)
})
}
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