forked from Shiloh/githaven
92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
|
package handlers
|
||
|
|
|
||
|
|
import (
|
||
|
|
"log"
|
||
|
|
"net/http"
|
||
|
|
"runtime/debug"
|
||
|
|
)
|
||
|
|
|
||
|
|
// RecoveryHandlerLogger is an interface used by the recovering handler to print logs.
|
||
|
|
type RecoveryHandlerLogger interface {
|
||
|
|
Println(...interface{})
|
||
|
|
}
|
||
|
|
|
||
|
|
type recoveryHandler struct {
|
||
|
|
handler http.Handler
|
||
|
|
logger RecoveryHandlerLogger
|
||
|
|
printStack bool
|
||
|
|
}
|
||
|
|
|
||
|
|
// RecoveryOption provides a functional approach to define
|
||
|
|
// configuration for a handler; such as setting the logging
|
||
|
|
// whether or not to print strack traces on panic.
|
||
|
|
type RecoveryOption func(http.Handler)
|
||
|
|
|
||
|
|
func parseRecoveryOptions(h http.Handler, opts ...RecoveryOption) http.Handler {
|
||
|
|
for _, option := range opts {
|
||
|
|
option(h)
|
||
|
|
}
|
||
|
|
|
||
|
|
return h
|
||
|
|
}
|
||
|
|
|
||
|
|
// RecoveryHandler is HTTP middleware that recovers from a panic,
|
||
|
|
// logs the panic, writes http.StatusInternalServerError, and
|
||
|
|
// continues to the next handler.
|
||
|
|
//
|
||
|
|
// Example:
|
||
|
|
//
|
||
|
|
// r := mux.NewRouter()
|
||
|
|
// r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
||
|
|
// panic("Unexpected error!")
|
||
|
|
// })
|
||
|
|
//
|
||
|
|
// http.ListenAndServe(":1123", handlers.RecoveryHandler()(r))
|
||
|
|
func RecoveryHandler(opts ...RecoveryOption) func(h http.Handler) http.Handler {
|
||
|
|
return func(h http.Handler) http.Handler {
|
||
|
|
r := &recoveryHandler{handler: h}
|
||
|
|
return parseRecoveryOptions(r, opts...)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// RecoveryLogger is a functional option to override
|
||
|
|
// the default logger
|
||
|
|
func RecoveryLogger(logger RecoveryHandlerLogger) RecoveryOption {
|
||
|
|
return func(h http.Handler) {
|
||
|
|
r := h.(*recoveryHandler)
|
||
|
|
r.logger = logger
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// PrintRecoveryStack is a functional option to enable
|
||
|
|
// or disable printing stack traces on panic.
|
||
|
|
func PrintRecoveryStack(print bool) RecoveryOption {
|
||
|
|
return func(h http.Handler) {
|
||
|
|
r := h.(*recoveryHandler)
|
||
|
|
r.printStack = print
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h recoveryHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
||
|
|
defer func() {
|
||
|
|
if err := recover(); err != nil {
|
||
|
|
w.WriteHeader(http.StatusInternalServerError)
|
||
|
|
h.log(err)
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
|
||
|
|
h.handler.ServeHTTP(w, req)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h recoveryHandler) log(v ...interface{}) {
|
||
|
|
if h.logger != nil {
|
||
|
|
h.logger.Println(v...)
|
||
|
|
} else {
|
||
|
|
log.Println(v...)
|
||
|
|
}
|
||
|
|
|
||
|
|
if h.printStack {
|
||
|
|
debug.PrintStack()
|
||
|
|
}
|
||
|
|
}
|