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46 lines
927 B
Go
46 lines
927 B
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package logheap logs a heap pprof profile.
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package logheap
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import (
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"bytes"
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"encoding/json"
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"io"
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"os"
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"runtime"
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"runtime/pprof"
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"time"
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)
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// LogHeap writes a JSON logtail record with the base64 heap pprof to
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// os.Stderr.
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func LogHeap() {
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logHeap(os.Stderr)
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}
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type logTail struct {
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ClientTime string `json:"client_time"`
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}
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type pprofRec struct {
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Heap []byte `json:"heap,omitempty"`
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}
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type logLine struct {
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LogTail logTail `json:"logtail"`
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Pprof pprofRec `json:"pprof"`
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}
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func logHeap(w io.Writer) error {
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runtime.GC()
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buf := new(bytes.Buffer)
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pprof.WriteHeapProfile(buf)
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return json.NewEncoder(w).Encode(logLine{
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LogTail: logTail{ClientTime: time.Now().Format(time.RFC3339Nano)},
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Pprof: pprofRec{Heap: buf.Bytes()},
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})
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}
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