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jfa-go/exit.go

79 lines
1.9 KiB

package main
import (
"fmt"
"html/template"
"log"
"os"
"path/filepath"
"runtime"
"runtime/debug"
"strings"
"time"
"github.com/pkg/browser"
)
// https://gist.github.com/swdunlop/9629168
func identifyPanic() string {
var name, file string
var line int
var pc [16]uintptr
n := runtime.Callers(4, pc[:])
for _, pc := range pc[:n] {
fn := runtime.FuncForPC(pc)
if fn == nil {
continue
}
file, line = fn.FileLine(pc)
name = fn.Name()
if !strings.HasPrefix(name, "runtime.") {
break
}
}
switch {
case name != "":
return fmt.Sprintf("%v:%v", name, line)
case file != "":
return fmt.Sprintf("%v:%v", file, line)
}
return fmt.Sprintf("pc:%x", pc)
}
// Exit dumps the last 100 lines of output to a crash file in /tmp (or equivalent), and generates a prettier HTML file containing it that is opened in the browser if possible.
func Exit(err interface{}) {
tmpl, err2 := template.ParseFS(localFS, "html/crash.html", "html/header.html")
if err2 != nil {
log.Fatalf("Failed to load template: %v", err)
}
logCache := lineCache.String()
logCache += "\n" + string(debug.Stack())
sanitized := sanitizeLog(logCache)
data := map[string]interface{}{
"Log": logCache,
"SanitizedLog": sanitized,
}
if err != nil {
data["Err"] = fmt.Sprintf("%s %v", identifyPanic(), err)
}
fpath := filepath.Join(temp, "jfa-go-crash-"+time.Now().Local().Format("2006-01-02T15:04:05"))
err2 = os.WriteFile(fpath+".txt", []byte(logCache), 0666)
if err2 != nil {
log.Fatalf("Failed to write crash dump file: %v", err2)
}
log.Printf("\n------\nA crash report has been saved to \"%s\".\n------", fpath+".txt")
f, err2 := os.OpenFile(fpath+".html", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
if err2 != nil {
log.Fatalf("Failed to open crash dump file: %v", err2)
}
defer f.Close()
err2 = tmpl.Execute(f, data)
if err2 != nil {
log.Fatalf("Failed to execute template: %v", err2)
}
browser.OpenFile(fpath + ".html")
}