212 lines
5.6 KiB
JavaScript
212 lines
5.6 KiB
JavaScript
import crypto from 'crypto'
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const async_build_js_script = async function (path_js_entry_script, build_options) {
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const result = await Bun.build({
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entrypoints: [ path_js_entry_script ],
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env: 'disable',
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minify: false,
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...build_options,
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})
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const str_out = await result.outputs[0].text()
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return str_out
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}
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const get_siteroot_html = function ({ page_title }) {return `
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<!DOCTYPE html>
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<html lang=en>
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<head>
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<meta charset=utf-8>
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<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'/>">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>${page_title || 'Page Title'}</title>
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</head>
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<body>
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<script type="text/javascript" src="/index.js">
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</script>
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</body>
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</html>
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`.trim()}
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const start_server = function ({ context_meta, config, jsbuild_app_frontend }) {
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const make_session_object = (ws) => {
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const map_obj = {
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ws,
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closed_by_server: false,
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id_interval_ping: null,
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id_timeout_checkpong: null,
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}
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const func_check_pong = () => {
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//console.debug('CHECK PONG')
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// if this check/timeout was not cancelled yet, indicates it's been "too long" (so, terminate ws)
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const terminate_session = () => {
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const code = 1008
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const reason = 'Policy Violation'
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map_obj.closed_by_server = true
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map_obj.ws.close(code, reason)
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// cleanup here
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context_meta.ws_map.delete(ws.data.uid)
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return
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}
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terminate_session()
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// reset this for future ref
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map_obj.id_timeout_checkpong = null
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return
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}
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const func_periodic_ping = () => {
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//console.debug('PING')
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ws.ping()
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if (config.pong_timeout !== null) {
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if (map_obj.id_timeout_checkpong === null) {
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map_obj.id_timeout_checkpong = setTimeout(func_check_pong, config.pong_timeout)
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}
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else {
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// avoid double-schedule of this check
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console.warn('Unexpected: setTimeout for func_check_pong already scheduled')
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}
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}
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return
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}
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if (config.ping_interval !== null) {
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map_obj.id_interval_ping = setInterval(func_periodic_ping, config.ping_interval)
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}
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return map_obj
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}
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const server = Bun.serve({
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hostname: config.hostname,
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port : config.port,
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async fetch (req, server) {
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const url = new URL(req.url)
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let resp
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if (url.pathname === '/') {
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resp = new Response(get_siteroot_html({ page_title: config.page_title }), { status: 200, headers: { 'Content-Type': 'text/html' } })
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}
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else if (url.pathname === '/index.js') {
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const str_js = await jsbuild_app_frontend()
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resp = new Response(
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await async_build_js_script(import.meta.dir + '/../frontend/index.js', {
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define: {
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JS_APP_FRONTEND: JSON.stringify(str_js),
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}
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}),
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{
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status: 200,
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headers: { 'Content-Type': 'text/javascript' }
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}
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)
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}
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else if (url.pathname === '/ws') {
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const uid = crypto.randomUUID()
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if (server.upgrade(req, {
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data: {
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uid,
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},
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})) {
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// do not return a Response if upgrade succeeds
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resp = undefined
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}
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resp = new Response('Upgrade failed', { status: 500 })
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}
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else {
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resp = new Response(null, { status: 404 })
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}
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return resp
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},
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websocket: {
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open: function (ws) {
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console.info(['ws open', ws.data.uid])
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const map_obj = make_session_object(ws)
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context_meta.ws_map.set(ws.data.uid, map_obj)
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return
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},
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close: function (ws, code, message) {
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const map_obj = context_meta.ws_map.get(ws.data.uid)
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if (map_obj === undefined) {
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console.warn(['Unexpected: ws_map missing uid', ws.data.uid])
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}
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else {
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// stop ping-ing
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if (map_obj.id_interval_ping !== null) {
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clearInterval(map_obj.id_interval_ping)
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}
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// stop pong-check-ing
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if (map_obj.id_timeout_checkpong !== null) {
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clearTimeout(map_obj.id_timeout_checkpong)
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}
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if (map_obj.closed_by_server === true) {
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console.info(['ws closed by server', ws.data.uid])
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// cleanup will happen in outer context
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}
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else {
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console.info(['ws closed by client', ws.data.uid, { code, message }])
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// cleanup from this context
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context_meta.ws_map.delete(ws.data.uid)
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}
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}
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return
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},
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message: function (ws, message) {},
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pong: function (ws, data) {
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//console.debug(['ws pong', ws.data.uid])
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const map_obj = context_meta.ws_map.get(ws.data.uid)
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if (map_obj === undefined) {
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console.warn(['Unexpected: ws_map missing uid', ws.data.uid])
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}
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else {
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// cancel pending check
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if (map_obj.id_timeout_checkpong !== null) {
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clearTimeout(map_obj.id_timeout_checkpong)
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// reset this for future ref
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map_obj.id_timeout_checkpong = null
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}
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}
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return
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},
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},
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})
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return server
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}
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const close_active_ws_sessions = function ({ context_meta }) {
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const keys_to_delete = []
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for (const [ uid, map_obj ] of context_meta.ws_map) {
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const code = 1001
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const reason = 'Going Away'
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map_obj.closed_by_server = true
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map_obj.ws.close(code, reason)
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keys_to_delete.push(uid)
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}
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for (let key of keys_to_delete) {
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context_meta.ws_map.delete(key)
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}
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return
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}
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const async_run = async function ({
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config,
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jsbuild_app_frontend,
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}) {
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const active_config = {
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// defaults
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hostname: '127.0.0.1',
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port: 8800,
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ping_interval: 1000 * 15,
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pong_timeout : 1000 * 5,
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// overrides
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...config,
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}
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const context_meta = {
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ws_map: new Map(),
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}
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const server = start_server({ context_meta, config: active_config, jsbuild_app_frontend })
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console.info(server)
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process.on('SIGINT', async () => {
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console.log('SIGINT intercepted')
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close_active_ws_sessions({ context_meta })
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// NOTE: wait for a second for teardown to fully complete
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await Bun.sleep(2000)
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process.exit()
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})
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return
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}
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export { async_run }
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