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echo.go
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echo.go
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/*
* Copyright (c) 2017, The Easegress Authors
* 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 main is the entry point of the simple echo server.
package main
import (
"fmt"
"io"
"net/http"
"os"
"time"
)
// TeeWriter is an io.Writer wrapper.
type TeeWriter struct {
writers []io.Writer
}
// NewTeeWriter returns a TeeWriter.
func NewTeeWriter(writers ...io.Writer) *TeeWriter {
return &TeeWriter{writers: writers}
}
// Write writes the data.
func (tw *TeeWriter) Write(p []byte) (n int, err error) {
for _, w := range tw.writers {
w.Write(p)
}
return len(p), nil
}
func main() {
echoHandler := func(w http.ResponseWriter, req *http.Request) {
time.Sleep(10 * time.Millisecond)
body, err := io.ReadAll(req.Body)
if err != nil {
body = []byte(fmt.Sprintf("<read failed: %v>", err))
}
tw := NewTeeWriter(w, os.Stdout)
url := req.URL.Path
if req.URL.Query().Encode() != "" {
url += "?" + req.URL.Query().Encode()
}
fmt.Fprintln(tw, "Your Request")
fmt.Fprintln(tw, "==============")
fmt.Fprintln(tw, "Method:", req.Method)
fmt.Fprintln(tw, "Host:", req.Host)
fmt.Fprintln(tw, "URL :", url)
fmt.Fprintln(tw, "Header:")
for k, v := range req.Header {
fmt.Fprintf(tw, " %s: %v\n", k, v)
}
fmt.Fprintln(tw, "Body :", string(body))
}
http.HandleFunc("/", echoHandler)
http.HandleFunc("/pipeline", echoHandler)
http.ListenAndServe(":9095", nil)
fmt.Println("listen and serve failed")
}