65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package negroni
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"runtime"
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"runtime/debug"
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)
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// Recovery is a Negroni middleware that recovers from any panics and writes a 500 if there was one.
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type Recovery struct {
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Logger ALogger
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PrintStack bool
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ErrorHandlerFunc func(interface{})
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StackAll bool
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StackSize int
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}
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// NewRecovery returns a new instance of Recovery
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func NewRecovery() *Recovery {
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return &Recovery{
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Logger: log.New(os.Stdout, "[negroni] ", 0),
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PrintStack: true,
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StackAll: false,
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StackSize: 1024 * 8,
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}
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}
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func (rec *Recovery) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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defer func() {
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if err := recover(); err != nil {
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if rw.Header().Get("Content-Type") == "" {
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rw.Header().Set("Content-Type", "text/plain; charset=utf-8")
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}
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rw.WriteHeader(http.StatusInternalServerError)
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stack := make([]byte, rec.StackSize)
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stack = stack[:runtime.Stack(stack, rec.StackAll)]
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f := "PANIC: %s\n%s"
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rec.Logger.Printf(f, err, stack)
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if rec.PrintStack {
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fmt.Fprintf(rw, f, err, stack)
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}
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if rec.ErrorHandlerFunc != nil {
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func() {
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defer func() {
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if err := recover(); err != nil {
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rec.Logger.Printf("provided ErrorHandlerFunc panic'd: %s, trace:\n%s", err, debug.Stack())
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rec.Logger.Printf("%s\n", debug.Stack())
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}
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}()
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rec.ErrorHandlerFunc(err)
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}()
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}
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}
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}()
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next(rw, r)
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}
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