mirror of
https://github.com/tailscale/tailscale.git
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70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
// Copyright (c) 2021 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 controlclient
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import (
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"bytes"
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"compress/gzip"
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"context"
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"fmt"
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"log"
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"net/http"
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"regexp"
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"runtime"
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"strconv"
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"time"
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)
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func dumpGoroutinesToURL(c *http.Client, targetURL string) {
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ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
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defer cancel()
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zbuf := new(bytes.Buffer)
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zw := gzip.NewWriter(zbuf)
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zw.Write(scrubbedGoroutineDump())
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zw.Close()
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req, err := http.NewRequestWithContext(ctx, "PUT", targetURL, zbuf)
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if err != nil {
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log.Printf("dumpGoroutinesToURL: %v", err)
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return
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}
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req.Header.Set("Content-Encoding", "gzip")
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t0 := time.Now()
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_, err = c.Do(req)
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d := time.Since(t0).Round(time.Millisecond)
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if err != nil {
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log.Printf("dumpGoroutinesToURL error: %v to %v (after %v)", err, targetURL, d)
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} else {
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log.Printf("dumpGoroutinesToURL complete to %v (after %v)", targetURL, d)
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}
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}
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var reHexArgs = regexp.MustCompile(`\b0x[0-9a-f]+\b`)
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// scrubbedGoroutineDump returns the list of all current goroutines, but with the actual
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// values of arguments scrubbed out, lest it contain some private key material.
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func scrubbedGoroutineDump() []byte {
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buf := make([]byte, 1<<20)
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buf = buf[:runtime.Stack(buf, true)]
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saw := map[string][]byte{} // "0x123" => "v1%3" (unique value 1 and its value mod 8)
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return reHexArgs.ReplaceAllFunc(buf, func(in []byte) []byte {
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if string(in) == "0x0" {
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return in
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}
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if v, ok := saw[string(in)]; ok {
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return v
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}
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u64, err := strconv.ParseUint(string(in[2:]), 16, 64)
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if err != nil {
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return []byte("??")
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}
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v := []byte(fmt.Sprintf("v%d%%%d", len(saw)+1, u64%8))
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saw[string(in)] = v
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return v
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})
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}
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