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responder.go
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responder.go
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// Copyright 2019 Authors of Cilium
//
// 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 responder
// this implementation is intentionally kept with minimal dependencies
// as this package typically runs in its own process
import (
"context"
"fmt"
"net/http"
"time"
)
// defaultTimeout used for shutdown
var defaultTimeout = 30 * time.Second
// Server wraps a minimal http server for the /hello endpoint
type Server struct {
httpServer http.Server
}
// NewServer creates a new server listening on the given port
func NewServer(port int) *Server {
return &Server{
http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: http.HandlerFunc(serverRequests),
},
}
}
// Serve http requests until shut down
func (s *Server) Serve() error {
return s.httpServer.ListenAndServe()
}
// Shutdown server gracefully
func (s *Server) Shutdown() error {
ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout)
defer cancel()
return s.httpServer.Shutdown(ctx)
}
func serverRequests(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/hello" {
w.WriteHeader(http.StatusOK)
} else {
w.WriteHeader(http.StatusNotFound)
}
}