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