93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package recoverer
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import (
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"fmt"
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"net/http"
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"runtime/debug"
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"go.pkg.cx/middleware"
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)
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// DefaultOptions represents default recoverer middleware options
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var DefaultOptions = Options(
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SetLogStackFn(defaultLogStackFn),
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SetLogRecoverFn(defaultLogRecoverFn),
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SetResponseHandler(RespondWithInternalServerError),
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)
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// Options turns a list of option instances into an option.
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func Options(opts ...Option) Option {
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return func(r *recoverer) {
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for _, opt := range opts {
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opt(r)
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}
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}
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}
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// SetLogStackFn sets log stack function
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func SetLogStackFn(fn func(stack []byte)) Option {
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return func(r *recoverer) {
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r.logStackFn = fn
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}
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}
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// SetLogRecoverFn sets log recover information function
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func SetLogRecoverFn(fn func(rec interface{})) Option {
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return func(r *recoverer) {
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r.logRecoverFn = fn
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}
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}
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// SetResponseHandler sets response handler
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func SetResponseHandler(fn middleware.ResponseHandle) Option {
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return func(r *recoverer) {
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r.responseHandler = fn
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}
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}
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// Option configures recoverer middleware
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type Option func(r *recoverer)
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type recoverer struct {
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logStackFn func(stack []byte)
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logRecoverFn func(rec interface{})
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responseHandler middleware.ResponseHandle
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}
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// Middleware is a recoverer middleware that recovers from panic
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func Middleware(opts ...Option) func(next http.Handler) http.Handler {
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rvr := &recoverer{}
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opts = append([]Option{DefaultOptions}, opts...)
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for _, opt := range opts {
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opt(rvr)
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}
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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defer func() {
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if rec := recover(); rec != nil {
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rvr.logRecoverFn(rec)
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rvr.logStackFn(debug.Stack())
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rvr.responseHandler(w, r, nil)
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}
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}()
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next.ServeHTTP(w, r)
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})
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}
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}
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// RespondWithInternalServerError is a default response handler
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func RespondWithInternalServerError(w http.ResponseWriter, r *http.Request, err error) {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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}
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func defaultLogStackFn(stack []byte) {
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fmt.Println(string(stack))
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}
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func defaultLogRecoverFn(rec interface{}) {
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fmt.Printf("request panic, %v", rec)
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}
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