140 lines
3.3 KiB
Go
140 lines
3.3 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"os"
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"path/filepath"
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"runtime"
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"runtime/debug"
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"time"
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)
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const crashLogFileName = "crashlogC.log"
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const pendingCrashFileName = "last-crash.json"
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type pendingCrashReport struct {
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At string `json:"at"`
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Reason string `json:"reason"`
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Detail string `json:"detail,omitempty"`
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Log string `json:"log,omitempty"`
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}
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func handleFatalPanic() {
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//garble:controlflow block_splits=10 junk_jumps=10 flatten_passes=2
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if r := recover(); r != nil {
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reason := fmt.Sprintf("panic: %v", r)
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stack := debug.Stack()
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path := writeCrashLog(reason, stack)
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writePendingCrashReport("panic", reason, path)
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log.Printf("[fatal] %s (see %s)", reason, path)
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os.Exit(1)
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}
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}
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func fatalExit(reason string, err error) {
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if err != nil {
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reason = fmt.Sprintf("%s: %v", reason, err)
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}
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if reason == "" {
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reason = "fatal error"
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}
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stack := debug.Stack()
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path := writeCrashLog(reason, stack)
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writePendingCrashReport("fatal", reason, path)
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log.Printf("[fatal] %s (see %s)", reason, path)
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os.Exit(1)
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}
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func goSafe(label string, cancel context.CancelFunc, fn func()) {
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go func() {
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defer recoverAndLog(label, cancel)
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fn()
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}()
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}
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func recoverAndLog(label string, cancel context.CancelFunc) {
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if r := recover(); r != nil {
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reason := fmt.Sprintf("%s panic: %v", label, r)
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stack := debug.Stack()
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path := writeCrashLog(reason, stack)
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writePendingCrashReport("panic", reason, path)
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log.Printf("[panic] %s (see %s)", reason, path)
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if cancel != nil {
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cancel()
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}
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}
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}
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func writeCrashLog(reason string, stack []byte) string {
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dir := crashLogDir()
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_ = os.MkdirAll(dir, 0700)
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path := filepath.Join(dir, crashLogFileName)
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file, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
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if err != nil {
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log.Printf("[fatal] failed to open crash log %s: %v", path, err)
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return path
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}
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defer file.Close()
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timestamp := time.Now().UTC().Format(time.RFC3339)
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_, _ = fmt.Fprintf(file, "\n=== %s ===\n", timestamp)
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_, _ = fmt.Fprintf(file, "GOOS=%s GOARCH=%s\n", runtime.GOOS, runtime.GOARCH)
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_, _ = fmt.Fprintf(file, "Reason: %s\n", reason)
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if len(stack) > 0 {
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_, _ = fmt.Fprintf(file, "Stack:\n%s\n", string(stack))
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}
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return path
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}
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func crashLogDir() string {
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return os.TempDir()
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}
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func pendingCrashPath() string {
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return filepath.Join(crashLogDir(), pendingCrashFileName)
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}
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func writePendingCrashReport(reason, detail, logPath string) {
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report := pendingCrashReport{
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At: time.Now().UTC().Format(time.RFC3339),
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Reason: reason,
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Detail: detail,
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Log: logPath,
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}
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_ = os.MkdirAll(crashLogDir(), 0700)
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data, err := json.Marshal(report)
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if err != nil {
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return
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}
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_ = os.WriteFile(pendingCrashPath(), data, 0600)
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}
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func loadPendingCrashReport() (pendingCrashReport, bool) {
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data, err := os.ReadFile(pendingCrashPath())
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if err != nil {
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return pendingCrashReport{}, false
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}
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var report pendingCrashReport
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if json.Unmarshal(data, &report) != nil || report.Reason == "" {
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return pendingCrashReport{}, false
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}
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if report.Detail == "" && report.Log != "" {
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if f, err := os.Open(report.Log); err == nil {
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defer f.Close()
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buf, _ := io.ReadAll(io.LimitReader(f, 4096))
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report.Detail = string(buf)
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}
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}
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return report, true
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}
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func clearPendingCrashReport() {
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_ = os.Remove(pendingCrashPath())
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}
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