539 lines
16 KiB
Go
539 lines
16 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build h2demo
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package main
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import (
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"bytes"
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"crypto/tls"
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"flag"
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"fmt"
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"hash/crc32"
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"image"
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"image/jpeg"
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"io"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"path"
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"regexp"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"time"
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"go4.org/syncutil/singleflight"
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"golang.org/x/crypto/acme/autocert"
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"golang.org/x/net/http2"
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)
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var (
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prod = flag.Bool("prod", false, "Whether to configure itself to be the production http2.golang.org server.")
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httpsAddr = flag.String("https_addr", "localhost:4430", "TLS address to listen on ('host:port' or ':port'). Required.")
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httpAddr = flag.String("http_addr", "", "Plain HTTP address to listen on ('host:port', or ':port'). Empty means no HTTP.")
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hostHTTP = flag.String("http_host", "", "Optional host or host:port to use for http:// links to this service. By default, this is implied from -http_addr.")
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hostHTTPS = flag.String("https_host", "", "Optional host or host:port to use for http:// links to this service. By default, this is implied from -https_addr.")
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)
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func homeOldHTTP(w http.ResponseWriter, r *http.Request) {
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io.WriteString(w, `<html>
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<body>
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<h1>Go + HTTP/2</h1>
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<p>Welcome to <a href="https://golang.org/">the Go language</a>'s <a href="https://http2.github.io/">HTTP/2</a> demo & interop server.</p>
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<p>Unfortunately, you're <b>not</b> using HTTP/2 right now. To do so:</p>
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<ul>
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<li>Use Firefox Nightly or go to <b>about:config</b> and enable "network.http.spdy.enabled.http2draft"</li>
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<li>Use Google Chrome Canary and/or go to <b>chrome://flags/#enable-spdy4</b> to <i>Enable SPDY/4</i> (Chrome's name for HTTP/2)</li>
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</ul>
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<p>See code & instructions for connecting at <a href="https://github.com/golang/net/tree/master/http2">https://github.com/golang/net/tree/master/http2</a>.</p>
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</body></html>`)
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}
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func home(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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io.WriteString(w, `<html>
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<body>
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<h1>Go + HTTP/2</h1>
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<p>Welcome to <a href="https://golang.org/">the Go language</a>'s <a
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href="https://http2.github.io/">HTTP/2</a> demo & interop server.</p>
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<p>Congratulations, <b>you're using HTTP/2 right now</b>.</p>
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<p>This server exists for others in the HTTP/2 community to test their HTTP/2 client implementations and point out flaws in our server.</p>
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<p>
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The code is at <a href="https://golang.org/x/net/http2">golang.org/x/net/http2</a> and
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is used transparently by the Go standard library from Go 1.6 and later.
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</p>
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<p>Contact info: <i>bradfitz@golang.org</i>, or <a
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href="https://golang.org/s/http2bug">file a bug</a>.</p>
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<h2>Handlers for testing</h2>
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<ul>
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<li>GET <a href="/reqinfo">/reqinfo</a> to dump the request + headers received</li>
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<li>GET <a href="/clockstream">/clockstream</a> streams the current time every second</li>
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<li>GET <a href="/gophertiles">/gophertiles</a> to see a page with a bunch of images</li>
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<li>GET <a href="/serverpush">/serverpush</a> to see a page with server push</li>
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<li>GET <a href="/file/gopher.png">/file/gopher.png</a> for a small file (does If-Modified-Since, Content-Range, etc)</li>
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<li>GET <a href="/file/go.src.tar.gz">/file/go.src.tar.gz</a> for a larger file (~10 MB)</li>
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<li>GET <a href="/redirect">/redirect</a> to redirect back to / (this page)</li>
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<li>GET <a href="/goroutines">/goroutines</a> to see all active goroutines in this server</li>
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<li>PUT something to <a href="/crc32">/crc32</a> to get a count of number of bytes and its CRC-32</li>
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<li>PUT something to <a href="/ECHO">/ECHO</a> and it will be streamed back to you capitalized</li>
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</ul>
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</body></html>`)
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}
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func reqInfoHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain")
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fmt.Fprintf(w, "Method: %s\n", r.Method)
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fmt.Fprintf(w, "Protocol: %s\n", r.Proto)
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fmt.Fprintf(w, "Host: %s\n", r.Host)
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fmt.Fprintf(w, "RemoteAddr: %s\n", r.RemoteAddr)
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fmt.Fprintf(w, "RequestURI: %q\n", r.RequestURI)
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fmt.Fprintf(w, "URL: %#v\n", r.URL)
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fmt.Fprintf(w, "Body.ContentLength: %d (-1 means unknown)\n", r.ContentLength)
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fmt.Fprintf(w, "Close: %v (relevant for HTTP/1 only)\n", r.Close)
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fmt.Fprintf(w, "TLS: %#v\n", r.TLS)
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fmt.Fprintf(w, "\nHeaders:\n")
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r.Header.Write(w)
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}
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func crcHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method != "PUT" {
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http.Error(w, "PUT required.", 400)
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return
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}
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crc := crc32.NewIEEE()
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n, err := io.Copy(crc, r.Body)
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if err == nil {
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w.Header().Set("Content-Type", "text/plain")
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fmt.Fprintf(w, "bytes=%d, CRC32=%x", n, crc.Sum(nil))
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}
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}
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type capitalizeReader struct {
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r io.Reader
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}
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func (cr capitalizeReader) Read(p []byte) (n int, err error) {
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n, err = cr.r.Read(p)
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for i, b := range p[:n] {
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if b >= 'a' && b <= 'z' {
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p[i] = b - ('a' - 'A')
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}
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}
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return
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}
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type flushWriter struct {
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w io.Writer
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}
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func (fw flushWriter) Write(p []byte) (n int, err error) {
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n, err = fw.w.Write(p)
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if f, ok := fw.w.(http.Flusher); ok {
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f.Flush()
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}
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return
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}
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func echoCapitalHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method != "PUT" {
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http.Error(w, "PUT required.", 400)
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return
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}
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io.Copy(flushWriter{w}, capitalizeReader{r.Body})
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}
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var (
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fsGrp singleflight.Group
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fsMu sync.Mutex // guards fsCache
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fsCache = map[string]http.Handler{}
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)
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// fileServer returns a file-serving handler that proxies URL.
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// It lazily fetches URL on the first access and caches its contents forever.
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func fileServer(url string, latency time.Duration) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if latency > 0 {
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time.Sleep(latency)
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}
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hi, err := fsGrp.Do(url, func() (interface{}, error) {
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fsMu.Lock()
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if h, ok := fsCache[url]; ok {
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fsMu.Unlock()
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return h, nil
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}
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fsMu.Unlock()
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res, err := http.Get(url)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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slurp, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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modTime := time.Now()
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var h http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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http.ServeContent(w, r, path.Base(url), modTime, bytes.NewReader(slurp))
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})
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fsMu.Lock()
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fsCache[url] = h
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fsMu.Unlock()
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return h, nil
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})
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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hi.(http.Handler).ServeHTTP(w, r)
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})
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}
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func clockStreamHandler(w http.ResponseWriter, r *http.Request) {
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clientGone := w.(http.CloseNotifier).CloseNotify()
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w.Header().Set("Content-Type", "text/plain")
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ticker := time.NewTicker(1 * time.Second)
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defer ticker.Stop()
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fmt.Fprintf(w, "# ~1KB of junk to force browsers to start rendering immediately: \n")
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io.WriteString(w, strings.Repeat("# xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n", 13))
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for {
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fmt.Fprintf(w, "%v\n", time.Now())
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w.(http.Flusher).Flush()
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select {
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case <-ticker.C:
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case <-clientGone:
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log.Printf("Client %v disconnected from the clock", r.RemoteAddr)
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return
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}
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}
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}
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func registerHandlers() {
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tiles := newGopherTilesHandler()
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push := newPushHandler()
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mux2 := http.NewServeMux()
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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switch {
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case r.URL.Path == "/gophertiles":
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tiles.ServeHTTP(w, r) // allow HTTP/2 + HTTP/1.x
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return
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case strings.HasPrefix(r.URL.Path, "/serverpush"):
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push.ServeHTTP(w, r) // allow HTTP/2 + HTTP/1.x
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return
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case r.TLS == nil: // do not allow HTTP/1.x for anything else
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http.Redirect(w, r, "https://"+httpsHost()+"/", http.StatusFound)
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return
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}
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if r.ProtoMajor == 1 {
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if r.URL.Path == "/reqinfo" {
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reqInfoHandler(w, r)
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return
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}
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homeOldHTTP(w, r)
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return
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}
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mux2.ServeHTTP(w, r)
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})
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mux2.HandleFunc("/", home)
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mux2.Handle("/file/gopher.png", fileServer("https://golang.org/doc/gopher/frontpage.png", 0))
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mux2.Handle("/file/go.src.tar.gz", fileServer("https://storage.googleapis.com/golang/go1.4.1.src.tar.gz", 0))
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mux2.HandleFunc("/reqinfo", reqInfoHandler)
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mux2.HandleFunc("/crc32", crcHandler)
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mux2.HandleFunc("/ECHO", echoCapitalHandler)
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mux2.HandleFunc("/clockstream", clockStreamHandler)
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mux2.Handle("/gophertiles", tiles)
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mux2.HandleFunc("/redirect", func(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, "/", http.StatusFound)
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})
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stripHomedir := regexp.MustCompile(`/(Users|home)/\w+`)
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mux2.HandleFunc("/goroutines", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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buf := make([]byte, 2<<20)
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w.Write(stripHomedir.ReplaceAll(buf[:runtime.Stack(buf, true)], nil))
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})
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}
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var pushResources = map[string]http.Handler{
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"/serverpush/static/jquery.min.js": fileServer("https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js", 100*time.Millisecond),
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"/serverpush/static/godocs.js": fileServer("https://golang.org/lib/godoc/godocs.js", 100*time.Millisecond),
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"/serverpush/static/playground.js": fileServer("https://golang.org/lib/godoc/playground.js", 100*time.Millisecond),
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"/serverpush/static/style.css": fileServer("https://golang.org/lib/godoc/style.css", 100*time.Millisecond),
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}
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func newPushHandler() http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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for path, handler := range pushResources {
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if r.URL.Path == path {
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handler.ServeHTTP(w, r)
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return
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}
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}
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cacheBust := time.Now().UnixNano()
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if pusher, ok := w.(http.Pusher); ok {
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for path := range pushResources {
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url := fmt.Sprintf("%s?%d", path, cacheBust)
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if err := pusher.Push(url, nil); err != nil {
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log.Printf("Failed to push %v: %v", path, err)
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}
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}
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}
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time.Sleep(100 * time.Millisecond) // fake network latency + parsing time
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if err := pushTmpl.Execute(w, struct {
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CacheBust int64
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HTTPSHost string
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HTTPHost string
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}{
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CacheBust: cacheBust,
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HTTPSHost: httpsHost(),
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HTTPHost: httpHost(),
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}); err != nil {
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log.Printf("Executing server push template: %v", err)
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}
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})
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}
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func newGopherTilesHandler() http.Handler {
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const gopherURL = "https://blog.golang.org/go-programming-language-turns-two_gophers.jpg"
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res, err := http.Get(gopherURL)
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if err != nil {
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log.Fatal(err)
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}
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if res.StatusCode != 200 {
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log.Fatalf("Error fetching %s: %v", gopherURL, res.Status)
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}
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slurp, err := ioutil.ReadAll(res.Body)
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res.Body.Close()
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if err != nil {
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log.Fatal(err)
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}
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im, err := jpeg.Decode(bytes.NewReader(slurp))
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if err != nil {
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if len(slurp) > 1024 {
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slurp = slurp[:1024]
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}
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log.Fatalf("Failed to decode gopher image: %v (got %q)", err, slurp)
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}
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type subImager interface {
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SubImage(image.Rectangle) image.Image
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}
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const tileSize = 32
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xt := im.Bounds().Max.X / tileSize
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yt := im.Bounds().Max.Y / tileSize
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var tile [][][]byte // y -> x -> jpeg bytes
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for yi := 0; yi < yt; yi++ {
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var row [][]byte
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for xi := 0; xi < xt; xi++ {
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si := im.(subImager).SubImage(image.Rectangle{
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Min: image.Point{xi * tileSize, yi * tileSize},
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Max: image.Point{(xi + 1) * tileSize, (yi + 1) * tileSize},
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})
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buf := new(bytes.Buffer)
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if err := jpeg.Encode(buf, si, &jpeg.Options{Quality: 90}); err != nil {
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log.Fatal(err)
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}
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row = append(row, buf.Bytes())
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}
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tile = append(tile, row)
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ms, _ := strconv.Atoi(r.FormValue("latency"))
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const nanosPerMilli = 1e6
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if r.FormValue("x") != "" {
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x, _ := strconv.Atoi(r.FormValue("x"))
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y, _ := strconv.Atoi(r.FormValue("y"))
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if ms <= 1000 {
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time.Sleep(time.Duration(ms) * nanosPerMilli)
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}
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if x >= 0 && x < xt && y >= 0 && y < yt {
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http.ServeContent(w, r, "", time.Time{}, bytes.NewReader(tile[y][x]))
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return
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}
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}
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io.WriteString(w, "<html><body onload='showtimes()'>")
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fmt.Fprintf(w, "A grid of %d tiled images is below. Compare:<p>", xt*yt)
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for _, ms := range []int{0, 30, 200, 1000} {
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d := time.Duration(ms) * nanosPerMilli
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fmt.Fprintf(w, "[<a href='https://%s/gophertiles?latency=%d'>HTTP/2, %v latency</a>] [<a href='http://%s/gophertiles?latency=%d'>HTTP/1, %v latency</a>]<br>\n",
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httpsHost(), ms, d,
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httpHost(), ms, d,
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)
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}
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io.WriteString(w, "<p>\n")
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cacheBust := time.Now().UnixNano()
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for y := 0; y < yt; y++ {
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for x := 0; x < xt; x++ {
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fmt.Fprintf(w, "<img width=%d height=%d src='/gophertiles?x=%d&y=%d&cachebust=%d&latency=%d'>",
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tileSize, tileSize, x, y, cacheBust, ms)
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}
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io.WriteString(w, "<br/>\n")
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}
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io.WriteString(w, `<p><div id='loadtimes'></div></p>
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<script>
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function showtimes() {
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var times = 'Times from connection start:<br>'
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times += 'DOM loaded: ' + (window.performance.timing.domContentLoadedEventEnd - window.performance.timing.connectStart) + 'ms<br>'
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times += 'DOM complete (images loaded): ' + (window.performance.timing.domComplete - window.performance.timing.connectStart) + 'ms<br>'
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document.getElementById('loadtimes').innerHTML = times
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}
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</script>
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<hr><a href='/'><< Back to Go HTTP/2 demo server</a></body></html>`)
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})
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}
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func httpsHost() string {
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if *hostHTTPS != "" {
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return *hostHTTPS
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}
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if v := *httpsAddr; strings.HasPrefix(v, ":") {
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return "localhost" + v
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} else {
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return v
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}
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}
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func httpHost() string {
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if *hostHTTP != "" {
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return *hostHTTP
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}
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if v := *httpAddr; strings.HasPrefix(v, ":") {
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return "localhost" + v
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} else {
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return v
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}
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}
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func serveProdTLS() error {
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const cacheDir = "/var/cache/autocert"
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if err := os.MkdirAll(cacheDir, 0700); err != nil {
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return err
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}
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m := autocert.Manager{
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Cache: autocert.DirCache(cacheDir),
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Prompt: autocert.AcceptTOS,
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HostPolicy: autocert.HostWhitelist("http2.golang.org"),
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}
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srv := &http.Server{
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TLSConfig: &tls.Config{
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GetCertificate: m.GetCertificate,
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},
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}
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http2.ConfigureServer(srv, &http2.Server{
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NewWriteScheduler: func() http2.WriteScheduler {
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return http2.NewPriorityWriteScheduler(nil)
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},
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})
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ln, err := net.Listen("tcp", ":443")
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if err != nil {
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return err
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}
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return srv.Serve(tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig))
|
|
}
|
|
|
|
type tcpKeepAliveListener struct {
|
|
*net.TCPListener
|
|
}
|
|
|
|
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
|
|
tc, err := ln.AcceptTCP()
|
|
if err != nil {
|
|
return
|
|
}
|
|
tc.SetKeepAlive(true)
|
|
tc.SetKeepAlivePeriod(3 * time.Minute)
|
|
return tc, nil
|
|
}
|
|
|
|
func serveProd() error {
|
|
errc := make(chan error, 2)
|
|
go func() { errc <- http.ListenAndServe(":80", nil) }()
|
|
go func() { errc <- serveProdTLS() }()
|
|
return <-errc
|
|
}
|
|
|
|
const idleTimeout = 5 * time.Minute
|
|
const activeTimeout = 10 * time.Minute
|
|
|
|
// TODO: put this into the standard library and actually send
|
|
// PING frames and GOAWAY, etc: golang.org/issue/14204
|
|
func idleTimeoutHook() func(net.Conn, http.ConnState) {
|
|
var mu sync.Mutex
|
|
m := map[net.Conn]*time.Timer{}
|
|
return func(c net.Conn, cs http.ConnState) {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
if t, ok := m[c]; ok {
|
|
delete(m, c)
|
|
t.Stop()
|
|
}
|
|
var d time.Duration
|
|
switch cs {
|
|
case http.StateNew, http.StateIdle:
|
|
d = idleTimeout
|
|
case http.StateActive:
|
|
d = activeTimeout
|
|
default:
|
|
return
|
|
}
|
|
m[c] = time.AfterFunc(d, func() {
|
|
log.Printf("closing idle conn %v after %v", c.RemoteAddr(), d)
|
|
go c.Close()
|
|
})
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
var srv http.Server
|
|
flag.BoolVar(&http2.VerboseLogs, "verbose", false, "Verbose HTTP/2 debugging.")
|
|
flag.Parse()
|
|
srv.Addr = *httpsAddr
|
|
srv.ConnState = idleTimeoutHook()
|
|
|
|
registerHandlers()
|
|
|
|
if *prod {
|
|
*hostHTTP = "http2.golang.org"
|
|
*hostHTTPS = "http2.golang.org"
|
|
log.Fatal(serveProd())
|
|
}
|
|
|
|
url := "https://" + httpsHost() + "/"
|
|
log.Printf("Listening on " + url)
|
|
http2.ConfigureServer(&srv, &http2.Server{})
|
|
|
|
if *httpAddr != "" {
|
|
go func() {
|
|
log.Printf("Listening on http://" + httpHost() + "/ (for unencrypted HTTP/1)")
|
|
log.Fatal(http.ListenAndServe(*httpAddr, nil))
|
|
}()
|
|
}
|
|
|
|
go func() {
|
|
log.Fatal(srv.ListenAndServeTLS("server.crt", "server.key"))
|
|
}()
|
|
select {}
|
|
}
|