mirror of https://github.com/anoshenko/rui.git
436 lines
9.2 KiB
Go
436 lines
9.2 KiB
Go
//go:build !wasm
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package rui
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import (
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"context"
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_ "embed"
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"fmt"
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"io"
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"log"
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"math/rand"
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"net/http"
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"os/exec"
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"runtime"
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"strconv"
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"strings"
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"time"
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)
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//go:embed app_socket.js
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var socketScripts string
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//go:embed app_post.js
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var httpPostScripts string
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func debugLog(text string) {
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log.Println("\033[34m" + text)
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}
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func errorLog(text string) {
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log.Println("\033[31m" + text)
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}
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type sessionInfo struct {
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session Session
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response chan string
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}
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type application struct {
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server *http.Server
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params AppParams
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createContentFunc func(Session) SessionContent
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sessions map[int]sessionInfo
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}
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func (app *application) getStartPage() string {
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buffer := allocStringBuilder()
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defer freeStringBuilder(buffer)
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buffer.WriteString("<!DOCTYPE html>\n<html>\n")
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getStartPage(buffer, app.params)
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buffer.WriteString("\n</html>")
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return buffer.String()
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}
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func (app *application) Params() AppParams {
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params := app.params
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if params.NoSocket {
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params.SocketAutoClose = 0
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}
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return params
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}
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func (app *application) Finish() {
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for _, session := range app.sessions {
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session.session.close()
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if session.response != nil {
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close(session.response)
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session.response = nil
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}
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}
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := app.server.Shutdown(ctx); err != nil {
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log.Println(err.Error())
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}
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}
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func (app *application) nextSessionID() int {
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n := rand.Intn(0x7FFFFFFE) + 1
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_, ok := app.sessions[n]
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for ok {
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n = rand.Intn(0x7FFFFFFE) + 1
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_, ok = app.sessions[n]
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}
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return n
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}
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func (app *application) removeSession(id int) {
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if info, ok := app.sessions[id]; ok {
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if info.response != nil {
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close(info.response)
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}
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delete(app.sessions, id)
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}
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}
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func (app *application) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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if ProtocolInDebugLog {
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DebugLogF("%s %s", req.Method, req.URL.Path)
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}
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switch req.Method {
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case "POST":
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if req.URL.Path == "/" {
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app.postHandler(w, req)
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}
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case "GET":
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switch req.URL.Path {
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case "/":
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w.WriteHeader(http.StatusOK)
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io.WriteString(w, app.getStartPage())
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case "/ws":
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if bridge := createSocketBridge(w, req); bridge != nil {
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go app.socketReader(bridge)
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}
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case "/script.js":
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w.WriteHeader(http.StatusOK)
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if app.params.NoSocket {
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io.WriteString(w, httpPostScripts)
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} else {
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io.WriteString(w, socketScripts)
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}
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io.WriteString(w, "\n")
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io.WriteString(w, defaultScripts)
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default:
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filename := req.URL.Path[1:]
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if size := len(filename); size > 0 && filename[size-1] == '/' {
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filename = filename[:size-1]
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}
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if !serveResourceFile(filename, w, req) &&
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!serveDownloadFile(filename, w, req) {
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w.WriteHeader(http.StatusNotFound)
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}
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}
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}
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}
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func setSessionIDCookie(w http.ResponseWriter, sessionID int) {
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cookie := http.Cookie{
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Name: "session",
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Value: strconv.Itoa(sessionID),
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HttpOnly: true,
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}
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http.SetCookie(w, &cookie)
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}
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func (app *application) postHandler(w http.ResponseWriter, req *http.Request) {
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if reqBody, err := io.ReadAll(req.Body); err == nil {
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message := string(reqBody)
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if ProtocolInDebugLog {
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DebugLog(message)
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}
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if obj := ParseDataText(message); obj != nil {
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var session Session = nil
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var response chan string = nil
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if cookie, err := req.Cookie("session"); err == nil {
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sessionID, err := strconv.Atoi(cookie.Value)
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if err != nil {
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ErrorLog(err.Error())
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} else if info, ok := app.sessions[sessionID]; ok && info.response != nil {
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response = info.response
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session = info.session
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}
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}
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command := obj.Tag()
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startSession := false
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if session == nil || command == "startSession" {
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events := make(chan DataObject, 1024)
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bridge := createHttpBridge(req)
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response = bridge.response
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answer := ""
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session, answer = app.startSession(obj, events, bridge, response)
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bridge.writeMessage(answer)
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session.onStart()
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if command == "session-resume" {
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session.onResume()
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}
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bridge.sendResponse()
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setSessionIDCookie(w, session.ID())
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startSession = true
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go sessionEventHandler(session, events, bridge)
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}
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if !startSession {
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switch command {
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case "nop":
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session.sendResponse()
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case "session-close":
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session.onFinish()
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session.App().removeSession(session.ID())
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return
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default:
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if !session.handleAnswer(command, obj) {
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session.addToEventsQueue(obj)
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}
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}
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}
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io.WriteString(w, <-response)
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for len(response) > 0 {
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io.WriteString(w, <-response)
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}
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}
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}
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}
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func (app *application) socketReader(bridge *wsBridge) {
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var session Session
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events := make(chan DataObject, 1024)
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for {
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message, ok := bridge.readMessage()
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if !ok {
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events <- NewDataObject("disconnect")
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return
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}
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if ProtocolInDebugLog {
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DebugLog("🖥️ -> " + message)
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}
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if obj := ParseDataText(message); obj != nil {
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command := obj.Tag()
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switch command {
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case "startSession":
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answer := ""
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if session, answer = app.startSession(obj, events, bridge, nil); session != nil {
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if !bridge.writeMessage(answer) {
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return
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}
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session.onStart()
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go sessionEventHandler(session, events, bridge)
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}
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case "reconnect":
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session = nil
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if sessionText, ok := obj.PropertyValue("session"); ok {
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if sessionID, err := strconv.Atoi(sessionText); err == nil {
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if info, ok := app.sessions[sessionID]; ok {
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session = info.session
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session.setBridge(events, bridge)
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go sessionEventHandler(session, events, bridge)
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session.onReconnect()
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} else {
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DebugLogF("Session #%d not exists", sessionID)
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}
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} else {
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ErrorLog(`strconv.Atoi(sessionText) error: ` + err.Error())
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}
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} else {
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ErrorLog(`"session" key not found`)
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}
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if session == nil {
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/* answer := ""
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if session, answer = app.startSession(obj, events, bridge, nil); session != nil {
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if !bridge.writeMessage(answer) {
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return
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}
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session.onStart()
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go sessionEventHandler(session, events, bridge)
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bridge.writeMessage("restartSession();")
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}
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*/
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bridge.writeMessage("reloadPage();")
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return
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}
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default:
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if !session.handleAnswer(command, obj) {
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events <- obj
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}
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}
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}
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}
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}
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func sessionEventHandler(session Session, events chan DataObject, bridge bridge) {
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for {
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data := <-events
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switch command := data.Tag(); command {
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case "disconnect":
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session.onDisconnect()
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return
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case "session-close":
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session.onFinish()
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session.App().removeSession(session.ID())
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bridge.close()
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default:
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session.handleEvent(command, data)
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}
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}
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}
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func (app *application) startSession(params DataObject, events chan DataObject,
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bridge bridge, response chan string) (Session, string) {
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if app.createContentFunc == nil {
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return nil, ""
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}
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session := newSession(app, app.nextSessionID(), "", params)
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session.setBridge(events, bridge)
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if !session.setContent(app.createContentFunc(session)) {
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return nil, ""
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}
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app.sessions[session.ID()] = sessionInfo{
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session: session,
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response: response,
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}
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answer := allocStringBuilder()
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defer freeStringBuilder(answer)
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answer.WriteString("sessionID = '")
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answer.WriteString(strconv.Itoa(session.ID()))
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answer.WriteString("';\n")
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session.writeInitScript(answer)
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answerText := answer.String()
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if ProtocolInDebugLog {
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DebugLog("Start session:")
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DebugLog(answerText)
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}
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return session, answerText
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}
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var apps = []*application{}
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// StartApp - create the new application and start it
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func StartApp(addr string, createContentFunc func(Session) SessionContent, params AppParams) {
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app := new(application)
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app.params = params
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app.sessions = map[int]sessionInfo{}
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app.createContentFunc = createContentFunc
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apps = append(apps, app)
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redirectAddr := ""
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if index := strings.IndexRune(addr, ':'); index >= 0 {
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redirectAddr = addr[:index] + ":80"
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} else {
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redirectAddr = addr + ":80"
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if params.CertFile != "" && params.KeyFile != "" {
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addr += ":443"
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} else {
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addr += ":80"
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}
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}
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app.server = &http.Server{Addr: addr}
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http.Handle("/", app)
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serverRun := func(err error) {
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if err != nil {
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if err == http.ErrServerClosed {
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log.Println(err)
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} else {
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log.Fatal(err)
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}
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}
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}
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if params.CertFile != "" && params.KeyFile != "" {
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if params.Redirect80 {
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redirectTLS := func(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, "https://"+addr+r.RequestURI, http.StatusMovedPermanently)
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}
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go func() {
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serverRun(http.ListenAndServe(redirectAddr, http.HandlerFunc(redirectTLS)))
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}()
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}
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serverRun(app.server.ListenAndServeTLS(params.CertFile, params.KeyFile))
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} else {
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serverRun(app.server.ListenAndServe())
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}
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}
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func FinishApp() {
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for _, app := range apps {
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app.Finish()
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}
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apps = []*application{}
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}
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func OpenBrowser(url string) bool {
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var err error
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switch runtime.GOOS {
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case "linux":
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for _, provider := range []string{"xdg-open", "x-www-browser", "www-browser"} {
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if _, err = exec.LookPath(provider); err == nil {
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if err = exec.Command(provider, url).Start(); err == nil {
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return true
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}
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}
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}
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case "windows":
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err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
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case "darwin":
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err = exec.Command("open", url).Start()
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default:
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err = fmt.Errorf("unsupported platform")
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}
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return err != nil
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}
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