/
local.go
214 lines (180 loc) · 4.72 KB
/
local.go
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// Copyright 2011 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 !appengine
package main
import (
"flag"
"fmt"
"go/build"
"io"
"log"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"time"
"code.google.com/p/go.talks/pkg/socket"
// Imports so that go build/install automatically installs them.
_ "code.google.com/p/go-tour/pic"
_ "code.google.com/p/go-tour/tree"
_ "code.google.com/p/go-tour/wc"
)
const (
basePkg = "github.com/rcostu/go-tour-es/"
socketPath = "/socket"
)
var (
httpListen = flag.String("http", "127.0.0.1:3999", "host:port to listen on")
htmlOutput = flag.Bool("html", false, "render program output as HTML")
openBrowser = flag.Bool("openbrowser", true, "open browser automatically")
)
var (
// a source of numbers, for naming temporary files
uniq = make(chan int)
// GOPATH containing the tour packages
gopath = os.Getenv("GOPATH")
httpAddr string
)
func isRoot(path string) bool {
_, err := os.Stat(filepath.Join(path, "tour.article"))
return err == nil
}
func findRoot() (string, error) {
ctx := build.Default
p, err := ctx.Import(basePkg, "", build.FindOnly)
if err == nil && isRoot(p.Dir) {
return p.Dir, nil
}
tourRoot := filepath.Join(runtime.GOROOT(), "misc", "tour")
ctx.GOPATH = tourRoot
p, err = ctx.Import(basePkg, "", build.FindOnly)
if err == nil && isRoot(tourRoot) {
gopath = tourRoot
return tourRoot, nil
}
return "", fmt.Errorf("could not find go-tour content; check $GOROOT and $GOPATH")
}
func main() {
flag.Parse()
// source of unique numbers
go func() {
for i := 0; ; i++ {
uniq <- i
}
}()
// find and serve the go tour files
root, err := findRoot()
if err != nil {
log.Fatalf("Couldn't find tour files: %v", err)
}
log.Println("Serving content from", root)
host, port, err := net.SplitHostPort(*httpListen)
if err != nil {
log.Fatal(err)
}
if host == "" {
host = "localhost"
}
if host != "127.0.0.1" && host != "localhost" {
log.Print(localhostWarning)
}
httpAddr = host + ":" + port
if err := initTour(root); err != nil {
log.Fatal(err)
}
fs := http.FileServer(http.Dir(root))
http.Handle("/favicon.ico", fs)
http.Handle("/static/", fs)
http.Handle("/talks/", fs)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" {
if err := renderTour(w); err != nil {
log.Println(err)
}
return
}
http.Error(w, "not found", 404)
})
http.Handle(socketPath, socket.Handler)
err = serveScripts(filepath.Join(root, "js"), "socket.js")
if err != nil {
log.Fatal(err)
}
go func() {
url := "http://" + httpAddr
if waitServer(url) && *openBrowser && startBrowser(url) {
log.Printf("A browser window should open. If not, please visit %s", url)
} else {
log.Printf("Please open your web browser and visit %s", url)
}
}()
log.Fatal(http.ListenAndServe(httpAddr, nil))
}
const localhostWarning = `
WARNING! WARNING! WARNING!
I appear to be listening on an address that is not localhost.
Anyone with access to this address and port will have access
to this machine as the user running gotour.
If you don't understand this message, hit Control-C to terminate this process.
WARNING! WARNING! WARNING!
`
type response struct {
Output string `json:"output"`
Errors string `json:"compile_errors"`
}
func init() {
socket.Environ = environ
}
// environ returns an execution environment containing only GO* variables
// and replacing GOPATH with the value of the global var gopath.
func environ() (env []string) {
for _, v := range os.Environ() {
if !strings.HasPrefix(v, "GO") {
continue
}
if strings.HasPrefix(v, "GOPATH=") {
v = "GOPATH=" + gopath
}
env = append(env, v)
}
return
}
// waitServer waits some time for the http Server to start
// serving url and returns whether it starts
func waitServer(url string) bool {
tries := 20
for tries > 0 {
resp, err := http.Get(url)
if err == nil {
resp.Body.Close()
return true
}
time.Sleep(100 * time.Millisecond)
tries--
}
return false
}
// startBrowser tries to open the URL in a browser, and returns
// whether it succeed.
func startBrowser(url string) bool {
// try to start the browser
var args []string
switch runtime.GOOS {
case "darwin":
args = []string{"open"}
case "windows":
args = []string{"cmd", "/c", "start"}
default:
args = []string{"xdg-open"}
}
cmd := exec.Command(args[0], append(args[1:], url)...)
return cmd.Start() == nil
}
// prepContent for the local tour simply returns the content as-is.
func prepContent(r io.Reader) io.Reader { return r }
// socketAddr returns the WebSocket handler address.
func socketAddr() string { return "ws://" + httpAddr + socketPath }