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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2020 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package debug
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"runtime/debug"
"time"
"github.com/sasha-s/go-deadlock"
)
var writer io.Writer
var RecoverPrettyPanic bool
var DeadlockDetection bool
var WriteLogs bool
var OnRecover func()
var LogDirectory = filepath.Join(os.TempDir(), "gomuks")
func Initialize() {
err := os.MkdirAll(LogDirectory, 0750)
if err != nil {
RecoverPrettyPanic = false
DeadlockDetection = false
WriteLogs = false
return
}
if WriteLogs {
writer, err = os.OpenFile(filepath.Join(LogDirectory, "debug.log"), os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0640)
if err != nil {
panic(err)
}
_, _ = fmt.Fprintf(writer, "======================= Debug init @ %s =======================\n", time.Now().Format("2006-01-02 15:04:05"))
}
if DeadlockDetection {
deadlocks, err := os.OpenFile(filepath.Join(LogDirectory, "deadlock.log"), os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0640)
if err != nil {
panic(err)
}
deadlock.Opts.LogBuf = deadlocks
deadlock.Opts.OnPotentialDeadlock = func() {
if OnRecover != nil {
OnRecover()
}
_, _ = fmt.Fprintf(os.Stderr, "Potential deadlock detected. See %s/deadlock.log for more information.", LogDirectory)
os.Exit(88)
}
_, err = fmt.Fprintf(deadlocks, "======================= Debug init @ %s =======================\n", time.Now().Format("2006-01-02 15:04:05"))
if err != nil {
panic(err)
}
} else {
deadlock.Opts.Disable = true
}
}
func Printf(text string, args ...interface{}) {
if writer != nil {
_, _ = fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
_, _ = fmt.Fprintf(writer, text+"\n", args...)
}
}
func Print(text ...interface{}) {
if writer != nil {
_, _ = fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
_, _ = fmt.Fprintln(writer, text...)
}
}
func PrintStack() {
if writer != nil {
_, _ = writer.Write(debug.Stack())
}
}
// Recover recovers a panic, runs the OnRecover handler and either re-panics or
// shows an user-friendly message about the panic depending on whether or not
// the pretty panic mode is enabled.
func Recover() {
if p := recover(); p != nil {
if OnRecover != nil {
OnRecover()
}
if RecoverPrettyPanic {
PrettyPanic(p)
} else {
panic(p)
}
}
}
const Oops = ` __________
< Oh noes! >
‾‾‾\‾‾‾‾‾‾
\ ^__^
\ (XX)\_______
(__)\ )\/\
U ||----W |
|| ||
A fatal error has occurred.
`
func PrettyPanic(panic interface{}) {
fmt.Print(Oops)
traceFile := fmt.Sprintf(filepath.Join(LogDirectory, "panic-%s.txt"), time.Now().Format("2006-01-02--15-04-05"))
var buf bytes.Buffer
_, _ = fmt.Fprintln(&buf, panic)
buf.Write(debug.Stack())
err := ioutil.WriteFile(traceFile, buf.Bytes(), 0640)
if err != nil {
fmt.Println("Saving the stack trace to", traceFile, "failed:")
fmt.Println("--------------------------------------------------------------------------------")
fmt.Println(err)
fmt.Println("--------------------------------------------------------------------------------")
fmt.Println("")
fmt.Println("You can file an issue at https://github.com/tulir/gomuks/issues.")
fmt.Println("Please provide the file save error (above) and the stack trace of the original error (below) when filing an issue.")
fmt.Println("")
fmt.Println("--------------------------------------------------------------------------------")
fmt.Println(panic)
debug.PrintStack()
fmt.Println("--------------------------------------------------------------------------------")
} else {
fmt.Println("The stack trace has been saved to", traceFile)
fmt.Println("")
fmt.Println("You can file an issue at https://github.com/tulir/gomuks/issues.")
fmt.Println("Please provide the contents of that file when filing an issue.")
}
os.Exit(1)
}
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