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requestid.go
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/
requestid.go
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// Copyright 2015 Light Code Labs, LLC
//
// 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 requestid
import (
"context"
"net/http"
"github.com/google/uuid"
"github.com/mholt/caddy/caddyhttp/httpserver"
)
// Handler is a middleware handler
type Handler struct {
Next httpserver.Handler
}
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
reqid := uuid.New().String()
c := context.WithValue(r.Context(), httpserver.RequestIDCtxKey, reqid)
r = r.WithContext(c)
return h.Next.ServeHTTP(w, r)
}