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request_id.go
39 lines (34 loc) · 1.24 KB
/
request_id.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 (
"crypto/rand"
"net/http"
ulid "github.com/oklog/ulid/v2"
)
const requestIDHeader = "X-Request-ID"
// RequestID returns a middleware that inserts a request ID into each request.
func RequestID() MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
requestID := r.Header.Get(requestIDHeader)
if requestID == "" {
requestID = ulid.MustNew(ulid.Now(), rand.Reader).String()
r.Header.Set(requestIDHeader, requestID)
}
w.Header().Set(requestIDHeader, requestID)
next.ServeHTTP(w, r)
})
}
}