// PanicTrace trace panic stack info.
func PanicTrace(kb int) []byte {
s := []byte("/src/runtime/panic.go")
e := []byte("\ngoroutine ")
line := []byte("\n")
stack := make([]byte, kb<<10) //4KB
length := runtime.Stack(stack, true)
start := bytes.Index(stack, s)
stack = stack[start:length]
start = bytes.Index(stack, line) + 1
stack = stack[start:]
end := bytes.LastIndex(stack, line)
if end != -1 {
stack = stack[:end]
}
end = bytes.Index(stack, e)
if end != -1 {
stack = stack[:end]
}
stack = bytes.TrimRight(stack, "\n")
return stack
}
该函数的优点:
- 比直接recover()捕获的panic信息更加详尽
- 比直接放任其panic打印的堆栈信息更精准,第一行就是发生panic的代码行
- 比直接放任其panic打印的堆栈信息更简洁,可以指定信息量(kb)
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