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recover.go
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package webmiddleware
import (
"fmt"
"net/http"
"os"
"runtime/debug"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
"go.thethings.network/lorawan-stack/v3/pkg/webhandlers"
)
// errHTTPRecovered is returned when a panic is caught from an HTTP handler.
var errHTTPRecovered = errors.DefineInternal("http_recovered", "Internal Server Error")
// Recover returns middleware that recovers from panics.
func Recover() MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if p := recover(); p != nil {
fmt.Fprintln(os.Stderr, p)
os.Stderr.Write(debug.Stack())
var err error
if pErr, ok := p.(error); ok {
err = errHTTPRecovered.WithCause(pErr)
} else {
err = errHTTPRecovered.WithAttributes("panic", p)
}
webhandlers.Error(w, r, err)
}
}()
next.ServeHTTP(w, r)
})
}
}