mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-25 19:15:34 +00:00
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
// Copyright (c) 2021 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 controlclient
|
|
|
|
import (
|
|
"bytes"
|
|
"compress/gzip"
|
|
"context"
|
|
"fmt"
|
|
"log"
|
|
"net/http"
|
|
"regexp"
|
|
"runtime"
|
|
"strconv"
|
|
"time"
|
|
)
|
|
|
|
func dumpGoroutinesToURL(c *http.Client, targetURL string) {
|
|
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
|
|
defer cancel()
|
|
|
|
zbuf := new(bytes.Buffer)
|
|
zw := gzip.NewWriter(zbuf)
|
|
zw.Write(scrubbedGoroutineDump())
|
|
zw.Close()
|
|
|
|
req, err := http.NewRequestWithContext(ctx, "PUT", targetURL, zbuf)
|
|
if err != nil {
|
|
log.Printf("dumpGoroutinesToURL: %v", err)
|
|
return
|
|
}
|
|
req.Header.Set("Content-Encoding", "gzip")
|
|
t0 := time.Now()
|
|
_, err = c.Do(req)
|
|
d := time.Since(t0).Round(time.Millisecond)
|
|
if err != nil {
|
|
log.Printf("dumpGoroutinesToURL error: %v to %v (after %v)", err, targetURL, d)
|
|
} else {
|
|
log.Printf("dumpGoroutinesToURL complete to %v (after %v)", targetURL, d)
|
|
}
|
|
}
|
|
|
|
var reHexArgs = regexp.MustCompile(`\b0x[0-9a-f]+\b`)
|
|
|
|
// scrubbedGoroutineDump returns the list of all current goroutines, but with the actual
|
|
// values of arguments scrubbed out, lest it contain some private key material.
|
|
func scrubbedGoroutineDump() []byte {
|
|
buf := make([]byte, 1<<20)
|
|
buf = buf[:runtime.Stack(buf, true)]
|
|
|
|
saw := map[string][]byte{} // "0x123" => "v1%3" (unique value 1 and its value mod 8)
|
|
return reHexArgs.ReplaceAllFunc(buf, func(in []byte) []byte {
|
|
if string(in) == "0x0" {
|
|
return in
|
|
}
|
|
if v, ok := saw[string(in)]; ok {
|
|
return v
|
|
}
|
|
u64, err := strconv.ParseUint(string(in[2:]), 16, 64)
|
|
if err != nil {
|
|
return []byte("??")
|
|
}
|
|
v := []byte(fmt.Sprintf("v%d%%%d", len(saw)+1, u64%8))
|
|
saw[string(in)] = v
|
|
return v
|
|
})
|
|
}
|