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panic.go
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panic.go
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/*
*Copyright (c) 2022, kaydxh
*
*Permission is hereby granted, free of charge, to any person obtaining a copy
*of this software and associated documentation files (the "Software"), to deal
*in the Software without restriction, including without limitation the rights
*to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
*copies of the Software, and to permit persons to whom the Software is
*furnished to do so, subject to the following conditions:
*
*The above copyright notice and this permission notice shall be included in all
*copies or substantial portions of the Software.
*
*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
*IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
*AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
*LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
*OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*SOFTWARE.
*/
package runtime
import (
"fmt"
"net/http"
"github.com/sirupsen/logrus"
)
// PanicHandlers is a list of functions which will be invoked when a panic happens.
var PanicHandlers = []func(interface{}){logPanic}
//must use defer Recover()
//not effective for calling defer func() {Recover()}()
func Recover() {
if r := recover(); r != nil {
for _, fn := range PanicHandlers {
fn(r)
}
}
}
// logPanic logs the caller tree when a panic occurs (except in the special case of http.ErrAbortHandler).
func logPanic(r interface{}) {
if r == http.ErrAbortHandler {
// honor the http.ErrAbortHandler sentinel panic value:
// ErrAbortHandler is a sentinel panic value to abort a handler.
// While any panic from ServeHTTP aborts the response to the client,
// panicking with ErrAbortHandler also suppresses logging of a stack trace to the server's error log.
return
}
// Same as stdlib http server code. Manually allocate stack trace buffer size
// to prevent excessively large logs
stacktrace := GetCallStackTrace()
if _, ok := r.(string); ok {
logrus.Errorf("Observed a panic: %s\n%s", r, stacktrace)
} else {
logrus.Errorf("Observed a panic: %#v (%v)\n%s", r, r, stacktrace)
}
}
// RecoverFromPanic replaces the specified error with an error containing the
// original error, and the call tree when a panic occurs. This enables error
// handlers to handle errors and panics the same way.
func RecoverFromPanic(err *error) {
if r := recover(); r != nil {
// Same as stdlib http server code. Manually allocate stack trace buffer size
// to prevent excessively large logs
stacktrace := GetCallStackTrace()
*err = fmt.Errorf(
"recovered from panic %q. (err=%v) Call stack:\n%s",
r,
*err,
stacktrace)
}
}
// Must panics on non-nil errors. Useful to handling programmer level errors
func Must(err error) {
if err != nil {
panic(err)
}
}