/
server.go
183 lines (159 loc) · 4.04 KB
/
server.go
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package livepkg
import (
"encoding/json"
"fmt"
"html/template"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"path"
"strings"
"sync"
"time"
"golang.org/x/net/websocket"
)
// Server implements a live reloading server for JS
type Server struct {
root http.FileSystem
main []string
dev bool
socket http.Handler
once sync.Once
bundle *Bundle
mu sync.RWMutex
clients map[*websocket.Conn]struct{}
}
// NewServer returns a new server
func NewServer(root http.FileSystem, dev bool, main ...string) *Server {
server := &Server{
root: root,
main: main,
dev: dev,
bundle: NewBundle(root, main...),
clients: make(map[*websocket.Conn]struct{}),
}
server.socket = websocket.Handler(server.livechanges)
return server
}
// init initializes the bundle and starts monitoring disk for changes
func (server *Server) init() {
_, err := server.bundle.Reload()
if err != nil {
log.Println(err)
}
if server.dev {
go server.monitor()
}
}
// broadcast sends a change to all connected clients
func (server *Server) broadcast(change *Change) {
server.mu.RLock()
defer server.mu.RUnlock()
for ws := range server.clients {
websocket.JSON.Send(ws, change)
}
}
// monitor monitors for changes on disk
func (server *Server) monitor() {
for {
changes, err := server.bundle.Reload()
if err != nil {
log.Println(err)
}
if len(changes) > 0 {
for _, change := range changes {
server.broadcast(change)
}
}
time.Sleep(500 * time.Millisecond)
}
}
// ServeHTTP implements http.Server
func (server *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
server.once.Do(server.init)
if server.dev {
server.serveLive(w, r)
} else {
server.serveBundle(w, r)
}
}
// serveLive serves reloader and serves the web socket connection
func (server *Server) serveLive(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "must-revalidate, no-cache")
switch path.Base(r.URL.Path) {
case "~pkg.js":
w.Header().Set("Content-Type", "application/javascript")
w.Write([]byte(jspackage))
origurl, err := url.ParseRequestURI(r.RequestURI)
origpath := r.RequestURI
if err != nil && origurl != nil {
origpath = origurl.Path
}
rootpath := template.JSEscapeString(path.Dir(origpath))
w.Write([]byte(strings.Replace(jsreloader, rootPathMarker, rootpath, -1)))
case "~pkg.json":
server.info(w, r)
case "~pkg.css":
// this will be handled by reloader
w.Header().Set("Content-Type", "text/css; charset=utf-8")
w.WriteHeader(http.StatusOK)
w.Write([]byte{'\n'})
case "~live":
server.socket.ServeHTTP(w, r)
default:
server.bundle.ServeFile(w, r)
}
}
// serveBundle serves the bundled js and css files
func (server *Server) serveBundle(w http.ResponseWriter, r *http.Request) {
switch path.Base(r.URL.Path) {
case "~pkg.js":
w.Header().Set("Content-Type", "application/javascript")
w.Write([]byte(jspackage))
w.Write(server.bundle.MergedByExt(".js"))
case "~pkg.css":
w.Header().Set("Content-Type", "text/css; charset=utf-8")
w.Write(server.bundle.MergedByExt(".css"))
case "~info":
w.WriteHeader(http.StatusForbidden)
case "~live":
w.WriteHeader(http.StatusForbidden)
default:
http.FileServer(server.root).ServeHTTP(w, r)
}
}
// info serves information about all the files
func (server *Server) info(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
var info struct {
Files []*Source `json:"files"`
}
var err error
info.Files = server.bundle.All()
data, err := json.MarshalIndent(info, "", "\t")
if err != nil {
http.Error(w, fmt.Sprintf("failed create JSON: %v", err), http.StatusInternalServerError)
return
}
w.Write(data)
}
// livechanges handles live reloader connection
func (server *Server) livechanges(ws *websocket.Conn) {
// wake up client
err := websocket.Message.Send(ws, "")
if err != nil {
return
}
defer ws.Close()
server.mu.Lock()
server.clients[ws] = struct{}{}
server.mu.Unlock()
defer func() {
server.mu.Lock()
delete(server.clients, ws)
server.mu.Unlock()
}()
io.Copy(ioutil.Discard, ws)
}