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tailscale/log/logheap/logheap.go

45 lines
1015 B
Go

// Copyright (c) 2020 Tailscale Inc & 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 logheap logs a heap pprof profile.
package logheap
import (
"bytes"
"context"
"log"
"net/http"
"runtime"
"runtime/pprof"
"time"
)
// LogHeap uploads a JSON logtail record with the base64 heap pprof by means
// of an HTTP POST request to the endpoint referred to in postURL.
func LogHeap(postURL string) {
if postURL == "" {
return
}
runtime.GC()
buf := new(bytes.Buffer)
if err := pprof.WriteHeapProfile(buf); err != nil {
log.Printf("LogHeap: %v", err)
return
}
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
req, err := http.NewRequestWithContext(ctx, "POST", postURL, buf)
if err != nil {
log.Printf("LogHeap: %v", err)
return
}
res, err := http.DefaultClient.Do(req)
if err != nil {
log.Printf("LogHeap: %v", err)
return
}
defer res.Body.Close()
}