func saveErrorReport(caught error) (string, error) {
logFile, err := ioutil.TempFile(os.TempDir(), "repeatr-error-report-")
if err != nil {
return "", err
}
defer logFile.Close()
fmt.Fprintf(logFile, "Repeatr error report\n")
fmt.Fprintf(logFile, "====================\n")
fmt.Fprintf(logFile, "Date: %s\n", time.Now())
fmt.Fprintf(logFile, "Briefly: %s\n", errors.GetMessage(caught))
fmt.Fprintf(logFile, "\n")
fmt.Fprintf(logFile, "Full error:\n")
fmt.Fprintf(logFile, "-----------\n")
fmt.Fprintf(logFile, "%s\n", caught)
fmt.Fprintf(logFile, "\n")
fmt.Fprintf(logFile, "Structure:\n")
fmt.Fprintf(logFile, "-----------\n")
fmt.Fprintf(logFile, "%#v\n", caught)
fmt.Fprintf(logFile, "\n")
// Record the stack.
// This is the same string format as golang panics when they crash the program.
// Note that if you didn't panic, it's... hard to get any useful data to you.
// Even if capturing stacks yourself (or using an error library to do it for you),
// the printing options available for captured stacks as possible for anyone
// outside of the golang core are... limited; the runtime "cheats" here, and
// and doesn't expose the same powers to anyone on the outside.
fmt.Fprintf(logFile, "Stack:\n")
fmt.Fprintf(logFile, "-----------\n")
buf := make([]byte, 1024*1024)
n := runtime.Stack(buf, false)
fmt.Fprintf(logFile, "%s\n", buf[0:n])
fmt.Fprintf(logFile, "\n")
return logFile.Name(), nil
}
// GetErrorBody will return the user-visible error message given an error.
// The message will be determined by errors.GetMessage() unless the error class
// has an error body overridden by OverrideErrorBody.
func GetErrorBody(err error) string {
rv := errors.GetData(err, errorBody)
message, ok := rv.(string)
if !ok {
return errors.GetMessage(err)
}
class := errors.GetClass(err)
if class == nil {
return message
}
return fmt.Sprintf("%s: %s", class.String(), message)
}
func main() {
try.Do(func() {
cli.Main(os.Args, os.Stderr, os.Stdout)
}).Catch(cli.Exit, func(err *errors.Error) {
// Errors marked as valid user-facing issues get a nice
// pretty-printed route out, and may include specified exit codes.
fmt.Fprintf(os.Stderr,
"%s\n",
err.Message())
// exit, taking the specified code if any.
code := errors.GetData(err, cli.ExitCodeKey)
if code == nil {
os.Exit(int(0))
}
os.Exit(int(code.(cli.ExitCode)))
}).Catch(cli.Error, func(err *errors.Error) {
// Errors marked as valid user-facing issues get a nice
// pretty-printed route out, and may include specified exit codes.
if isDebugMode() {
// in debug-mode, repanic all the way to death so that we get all of golang's built in log features.
panic(err)
} else {
// print nicely.
fmt.Fprintf(os.Stderr,
"Repeatr was unable to complete your request!\n"+
"%s\n",
err.Message())
// exit, taking the specified code if any.
code := errors.GetData(err, cli.ExitCodeKey)
if code == nil {
os.Exit(int(cli.EXIT_USER))
}
os.Exit(int(code.(cli.ExitCode)))
}
}).CatchAll(func(err error) {
// Errors that aren't marked as valid user-facing issues should be
// logged in preparation for a bug report.
if isDebugMode() {
// in debug-mode, repanic all the way to death so that we get all of golang's built in log features.
panic(err)
} else {
// save the error to a file. we want to keep the stacks, but not scare away the user.
logPath, saveErr := saveErrorReport(err)
var saveMsg string
if saveErr == nil {
saveMsg = fmt.Sprintf("We've logged the full error to a file: %q. Please include this in the report.", logPath)
} else {
saveMsg = fmt.Sprintf("Additionally, we were unable to save a full log of the problem (\"%s\").", saveErr)
}
fmt.Fprintf(os.Stderr,
"Repeatr encountered a serious issue and was unable to complete your request!\n"+
"Please file an issue to help us fix it.\n"+
"%s\n"+
"\n"+
"This is the short version of the problem:\n"+
"%s\n",
saveMsg,
errors.GetMessage(err),
)
os.Exit(int(cli.EXIT_UNKNOWNPANIC))
}
}).Done()
}