131 lines
2.8 KiB
Go
131 lines
2.8 KiB
Go
package gitmedia
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import (
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"bytes"
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"flag"
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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/debug"
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"strings"
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"time"
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)
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var (
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Debugging = false
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ErrorBuffer = &bytes.Buffer{}
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ErrorWriter = io.MultiWriter(os.Stderr, ErrorBuffer)
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OutputWriter = io.MultiWriter(os.Stdout, ErrorBuffer)
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)
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// Error prints a formatted message to Stderr. It also gets printed to the
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// panic log if one is created for this command.
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func Error(format string, args ...interface{}) {
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line := fmt.Sprintf(format, args...)
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fmt.Fprintln(ErrorWriter, line)
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}
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// Print prints a formatted message to Stdout. It also gets printed to the
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// panic log if one is created for this command.
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func Print(format string, args ...interface{}) {
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line := fmt.Sprintf(format, args...)
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fmt.Fprintln(OutputWriter, line)
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}
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// Exit prints a formatted message and exits.
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func Exit(format string, args ...interface{}) {
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Error(format, args...)
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os.Exit(2)
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}
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// Panic prints a formatted message, and writes a stack trace for the error to
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// a log file before exiting.
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func Panic(err error, format string, args ...interface{}) {
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Error(format, args...)
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file := handlePanic(err)
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if len(file) > 0 {
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fmt.Fprintf(os.Stderr, "\nErrors logged to %s.\nUse `git media logs last` to view the log.\n", file)
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}
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os.Exit(2)
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}
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// Debug prints a formatted message if debugging is enabled. The formatted
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// message also shows up in the panic log, if created.
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func Debug(format string, args ...interface{}) {
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if !Debugging {
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return
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}
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log.Printf(format, args...)
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}
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func SetupDebugging(flagset *flag.FlagSet) {
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if flagset == nil {
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flag.BoolVar(&Debugging, "debug", false, "Turns debugging on")
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} else {
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flagset.BoolVar(&Debugging, "debug", false, "Turns debugging on")
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}
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}
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func handlePanic(err error) string {
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if err == nil {
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return ""
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}
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Debug(err.Error())
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logFile, logErr := logPanic(err)
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if logErr != nil {
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fmt.Fprintf(os.Stderr, "Unable to log panic to %s\n", LocalLogDir)
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logEnv(os.Stderr)
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panic(logErr)
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}
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return logFile
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}
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func logEnv(w io.Writer) {
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for _, env := range Environ() {
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fmt.Fprintln(w, env)
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}
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}
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func logPanic(loggedError error) (string, error) {
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if err := os.MkdirAll(LocalLogDir, 0744); err != nil {
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return "", err
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}
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now := time.Now()
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name := now.Format("2006-01-02T15:04:05.999999999")
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full := filepath.Join(LocalLogDir, name+".log")
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file, err := os.Create(full)
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if err != nil {
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return "", err
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}
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defer file.Close()
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fmt.Fprintf(file, "> %s", filepath.Base(os.Args[0]))
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if len(os.Args) > 0 {
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fmt.Fprintf(file, " %s", strings.Join(os.Args[1:], " "))
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}
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fmt.Fprint(file, "\n")
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logEnv(file)
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fmt.Fprint(file, "\n")
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file.Write(ErrorBuffer.Bytes())
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fmt.Fprint(file, "\n")
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fmt.Fprintln(file, loggedError.Error())
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file.Write(debug.Stack())
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return full, nil
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}
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func init() {
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log.SetOutput(ErrorWriter)
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}
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