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Add auto logging of goroutine pid label (#19212)
* Add auto logging of goroutine pid label This PR uses unsafe to export the hidden runtime_getProfLabel function from the runtime package and then casts the result to a map[string]string. We can then interrogate this map to get the pid label from the goroutine allowing us to log it with any logging request. Reference #19202 Signed-off-by: Andrew Thornton <art27@cantab.net>
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20
modules/log/groutinelabel.go
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20
modules/log/groutinelabel.go
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// Copyright 2022 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package log
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import "unsafe"
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//go:linkname runtime_getProfLabel runtime/pprof.runtime_getProfLabel
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func runtime_getProfLabel() unsafe.Pointer // nolint
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type labelMap map[string]string
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func getGoroutineLabels() map[string]string {
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l := (*labelMap)(runtime_getProfLabel())
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if l == nil {
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return nil
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}
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return *l
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}
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34
modules/log/groutinelabel_test.go
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34
modules/log/groutinelabel_test.go
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// Copyright 2022 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package log
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import (
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"context"
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"runtime/pprof"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func Test_getGoroutineLabels(t *testing.T) {
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pprof.Do(context.Background(), pprof.Labels(), func(ctx context.Context) {
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currentLabels := getGoroutineLabels()
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pprof.ForLabels(ctx, func(key, value string) bool {
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assert.EqualValues(t, value, currentLabels[key])
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return true
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})
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pprof.Do(ctx, pprof.Labels("Test_getGoroutineLabels", "Test_getGoroutineLabels_child1"), func(ctx context.Context) {
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currentLabels := getGoroutineLabels()
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pprof.ForLabels(ctx, func(key, value string) bool {
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assert.EqualValues(t, value, currentLabels[key])
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return true
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})
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if assert.NotNil(t, currentLabels) {
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assert.EqualValues(t, "Test_getGoroutineLabels_child1", currentLabels["Test_getGoroutineLabels"])
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}
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})
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})
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}
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@ -72,6 +72,13 @@ func (l *MultiChannelledLogger) Log(skip int, level Level, format string, v ...i
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if len(v) > 0 {
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msg = ColorSprintf(format, v...)
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}
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labels := getGoroutineLabels()
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if labels != nil {
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pid, ok := labels["pid"]
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if ok {
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msg = "[" + ColorString(FgHiYellow) + pid + ColorString(Reset) + "] " + msg
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}
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}
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stack := ""
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if l.GetStacktraceLevel() <= level {
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stack = Stack(skip + 1)
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