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onetwoseven.go
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onetwoseven.go
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// Copyright 2016 Google Inc. All Rights Reserved.
// 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 onetwoseven is a simple web server.
package onetwoseven
import (
"fmt"
"net/http"
"github.com/aliafshar/toylog"
)
type Config struct {
Path string
HostPort string
}
func (c *Config) String() string {
return fmt.Sprintf("%v on %v", c.Path, c.HostPort)
}
type server struct {
config *Config
}
type wrappingHandler struct {
pre func(http.ResponseWriter, *http.Request)
post func(http.ResponseWriter, *http.Request)
handler http.Handler
}
func (h *wrappingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if h.pre != nil {
h.pre(w, r)
}
h.handler.ServeHTTP(w, r)
if h.post != nil {
h.post(w, r)
}
}
func (s *server) FileServer() http.Handler {
h := http.FileServer(http.Dir(s.config.Path))
return &wrappingHandler{
handler: h,
post: func(w http.ResponseWriter, r *http.Request) {
log(w, r)
},
}
}
func (s *server) start() {
http.Handle("/", s.FileServer())
http.ListenAndServe(s.config.HostPort, nil)
}
func log(w http.ResponseWriter, r *http.Request) {
toylog.Infof("%s %s %s", r.Method, r.URL, w.Header())
}
func Serve(config *Config) {
s := &server{config: config}
s.start()
}