mirror of
https://github.com/tailscale/tailscale.git
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117 lines
2.7 KiB
Go
117 lines
2.7 KiB
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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// The logreprocess program tails a log and reprocesses it.
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package main
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import (
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"bufio"
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"encoding/json"
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"flag"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strings"
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"time"
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"tailscale.com/logtail"
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)
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func main() {
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collection := flag.String("c", "", "logtail collection name to read")
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apiKey := flag.String("p", "", "logtail API key")
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timeout := flag.Duration("t", 0, "timeout after which logreprocess quits")
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flag.Parse()
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if len(flag.Args()) != 0 {
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flag.Usage()
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os.Exit(1)
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}
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log.SetFlags(0)
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if *timeout != 0 {
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go func() {
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<-time.After(*timeout)
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log.Printf("logreprocess: timeout reached, quitting")
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os.Exit(1)
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}()
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}
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req, err := http.NewRequest("GET", "https://log.tailscale.io/c/"+*collection+"?stream=true", nil)
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if err != nil {
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log.Fatal(err)
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}
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req.SetBasicAuth(*apiKey, "")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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log.Fatal(err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Fatalf("logreprocess: read error %d: %v", resp.StatusCode, err)
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}
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log.Fatalf("logreprocess: read error %d: %s", resp.StatusCode, string(b))
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}
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tracebackCache := make(map[logtail.PublicID]*ProcessedMsg)
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scanner := bufio.NewScanner(resp.Body)
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for scanner.Scan() {
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var msg Msg
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if err := json.Unmarshal(scanner.Bytes(), &msg); err != nil {
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log.Fatalf("logreprocess of %q: %v", string(scanner.Bytes()), err)
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}
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var pMsg *ProcessedMsg
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if pMsg = tracebackCache[msg.Logtail.Instance]; pMsg != nil {
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pMsg.Text += "\n" + msg.Text
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if strings.HasPrefix(msg.Text, "Exception: ") {
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delete(tracebackCache, msg.Logtail.Instance)
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} else {
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continue // write later
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}
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} else {
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pMsg = &ProcessedMsg{
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OrigInstance: msg.Logtail.Instance,
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Text: msg.Text,
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}
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pMsg.Logtail.ClientTime = msg.Logtail.ClientTime
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}
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if strings.HasPrefix(msg.Text, "Traceback (most recent call last):") {
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tracebackCache[msg.Logtail.Instance] = pMsg
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continue // write later
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}
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b, err := json.Marshal(pMsg)
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if err != nil {
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log.Fatal(err)
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}
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log.Printf("%s", b)
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}
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if err := scanner.Err(); err != nil {
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log.Fatal(err)
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}
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}
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type Msg struct {
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Logtail struct {
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Instance logtail.PublicID `json:"instance"`
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ClientTime time.Time `json:"client_time"`
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} `json:"logtail"`
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Text string `json:"text"`
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}
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type ProcessedMsg struct {
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Logtail struct {
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ClientTime time.Time `json:"client_time"`
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} `json:"logtail"`
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OrigInstance logtail.PublicID `json:"orig_instance"`
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Text string `json:"text"`
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}
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