* lib/ur: Implement crash (panic) reporting (fixes #959) This implements a simple crash reporting method. It piggybacks on the panic log files created by the monitor process, picking these up and uploading them from the usage reporting routine. A new config value points to the crash receiver base URL, which defaults to "https://crash.syncthing.net/newcrash" (following the pattern of "https://data.syncthing.net/newdata" for usage reports, but allowing us to separate the service as required).
161 lines
4.0 KiB
Go
161 lines
4.0 KiB
Go
// Copyright (C) 2019 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package main
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import (
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"bytes"
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"errors"
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"io/ioutil"
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"regexp"
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"strings"
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raven "github.com/getsentry/raven-go"
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"github.com/maruel/panicparse/stack"
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)
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const reportServer = "https://crash.syncthing.net/report/"
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func sendReport(dsn, path string, report []byte) error {
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pkt, err := parseReport(path, report)
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if err != nil {
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return err
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}
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cli, err := raven.New(dsn)
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if err != nil {
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return err
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}
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// The client sets release and such on the packet before sending, in the
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// misguided idea that it knows this better than than the packet we give
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// it. So we copy the values from the packet to the client first...
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cli.SetRelease(pkt.Release)
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cli.SetEnvironment(pkt.Environment)
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_, errC := cli.Capture(pkt, nil)
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return <-errC
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}
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func parseReport(path string, report []byte) (*raven.Packet, error) {
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parts := bytes.SplitN(report, []byte("\n"), 2)
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if len(parts) != 2 {
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return nil, errors.New("no first line")
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}
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version, err := parseVersion(string(parts[0]))
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if err != nil {
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return nil, err
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}
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report = parts[1]
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foundPanic := false
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var subjectLine []byte
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for {
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parts = bytes.SplitN(report, []byte("\n"), 2)
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if len(parts) != 2 {
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return nil, errors.New("no panic line found")
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}
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line := parts[0]
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report = parts[1]
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if foundPanic {
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// The previous line was our "Panic at ..." header. We are now
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// at the beginning of the real panic trace and this is our
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// subject line.
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subjectLine = line
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break
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} else if bytes.HasPrefix(line, []byte("Panic at")) {
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foundPanic = true
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}
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}
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r := bytes.NewReader(report)
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ctx, err := stack.ParseDump(r, ioutil.Discard, false)
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if err != nil {
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return nil, err
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}
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var trace raven.Stacktrace
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for _, gr := range ctx.Goroutines {
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if gr.First {
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trace.Frames = make([]*raven.StacktraceFrame, len(gr.Stack.Calls))
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for i, sc := range gr.Stack.Calls {
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trace.Frames[len(trace.Frames)-1-i] = &raven.StacktraceFrame{
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Function: sc.Func.Name(),
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Module: sc.Func.PkgName(),
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Filename: sc.SrcPath,
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Lineno: sc.Line,
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}
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}
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break
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}
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}
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pkt := &raven.Packet{
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Message: string(subjectLine),
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Platform: "go",
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Release: version.tag,
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Tags: raven.Tags{
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raven.Tag{Key: "version", Value: version.version},
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raven.Tag{Key: "tag", Value: version.tag},
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raven.Tag{Key: "commit", Value: version.commit},
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raven.Tag{Key: "codename", Value: version.codename},
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raven.Tag{Key: "runtime", Value: version.runtime},
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raven.Tag{Key: "goos", Value: version.goos},
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raven.Tag{Key: "goarch", Value: version.goarch},
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raven.Tag{Key: "builder", Value: version.builder},
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},
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Extra: raven.Extra{
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"url": reportServer + path,
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},
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Interfaces: []raven.Interface{&trace},
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}
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return pkt, nil
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}
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// syncthing v1.1.4-rc.1+30-g6aaae618-dirty-crashrep "Erbium Earthworm" (go1.12.5 darwin-amd64) jb@kvin.kastelo.net 2019-05-23 16:08:14 UTC
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var longVersionRE = regexp.MustCompile(`syncthing\s+(v[^\s]+)\s+"([^"]+)"\s\(([^\s]+)\s+([^-]+)-([^)]+)\)\s+([^\s]+)`)
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type version struct {
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version string // "v1.1.4-rc.1+30-g6aaae618-dirty-crashrep"
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tag string // "v1.1.4-rc.1"
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commit string // "6aaae618", blank when absent
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codename string // "Erbium Earthworm"
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runtime string // "go1.12.5"
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goos string // "darwin"
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goarch string // "amd64"
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builder string // "jb@kvin.kastelo.net"
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}
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func parseVersion(line string) (version, error) {
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m := longVersionRE.FindStringSubmatch(line)
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if len(m) == 0 {
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return version{}, errors.New("unintelligeble version string")
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}
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v := version{
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version: m[1],
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codename: m[2],
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runtime: m[3],
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goos: m[4],
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goarch: m[5],
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builder: m[6],
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}
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parts := strings.Split(v.version, "+")
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v.tag = parts[0]
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if len(parts) > 1 {
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fields := strings.Split(parts[1], "-")
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if len(fields) >= 2 && strings.HasPrefix(fields[1], "g") {
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v.commit = fields[1][1:]
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}
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}
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return v, nil
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}
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