/
requestid.go
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/
requestid.go
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// Copyright 2016 IBM Corporation
//
// 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 middleware
import (
"github.com/amalgam8/amalgam8/controller/util"
"github.com/ant0ine/go-json-rest/rest"
"github.com/pborman/uuid"
)
// RequestIDMiddleware appends a request ID header to incoming request for log tracing across services
type RequestIDMiddleware struct{}
// MiddlewareFunc makes RequestIDMiddleware implement the Middleware interface.
func (mw *RequestIDMiddleware) MiddlewareFunc(h rest.HandlerFunc) rest.HandlerFunc {
return func(w rest.ResponseWriter, r *rest.Request) {
reqID := r.Header.Get(util.RequestIDHeader)
// Generate a request ID if none is present
if reqID == "" {
reqID = uuid.New()
r.Header.Set(util.RequestIDHeader, reqID)
}
// Add the request ID to the response headers
w.Header().Set(util.RequestIDHeader, reqID)
// Handle the request
h(w, r)
}
}