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>tokarchuk/v1.17
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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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// 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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