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decoratorBackendId.go
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/
decoratorBackendId.go
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// Copyright 2017 MSolution.IO
//
// 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 routes
import (
"net/http"
)
// BackendId is a decorator which adds a backend ID to incoming requests. It
// adds it to the response in the `X-Backend-ID` HTTP header. It is useful in
// correlating requests with logs.
type BackendId struct {
BackendId string
}
func (d BackendId) Decorate(h Handler) Handler {
h.Func = d.getFunc(h.Func)
return h
}
// getFunc returns a decorated handler function for BackendId.
func (d BackendId) getFunc(hf HandlerFunc) HandlerFunc {
return func(w http.ResponseWriter, r *http.Request, a Arguments) (int, interface{}) {
w.Header()["X-Backend-ID"] = []string{d.BackendId}
return hf(w, r, a)
}
}