98 lines
2.3 KiB
JavaScript
98 lines
2.3 KiB
JavaScript
// provided by outer context: APP_CONSTANTS, JS_APP_FRONTEND
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const setup_safer_eval = function (lst_idents) {
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const runCodeWithCustomFunction = (obj) => {
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return Function(...lst_idents.map(x=>x[0]), `"use strict";return (${obj});`.trim())(...lst_idents.map(x=>x[1]))
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}
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return runCodeWithCustomFunction
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}
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const do_safereval_strscript = function (obj_eval_defines, the_strscript) {
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const lst_idents = Object.entries(obj_eval_defines).map(([k,v])=>[k,v]).toSorted((a,b)=>(a[0]-b[0]))
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const the_eval_func = setup_safer_eval(lst_idents)
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const the_eval_result = the_eval_func(`
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(function(){
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${the_strscript}
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return
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})()
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`.trim())
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return the_eval_result
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}
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class FramerockUtils {
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constructor () {
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this._ws = undefined
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this.setup_transport = this._setup_transport.bind(this)
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this.teardown_transport = this._teardown_transport.bind(this)
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this.transport_send_bytes = this._transport_send_bytes.bind(this)
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return
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}
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_setup_transport ({ on_open, on_close, on_message }) {
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console.info('SETUP TRANSPORT')
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this._ws = new WebSocket(`ws://${window.location.host}/ws`)
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const ws = this._ws
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ws.binaryType = 'arraybuffer'
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const func_on_open = () => {
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console.info('WS OPEN')
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on_open && on_open()
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return
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}
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const func_on_close = (event) => {
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console.info('WS CLOSE')
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on_close && on_close(event)
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return
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}
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const func_on_message = (event) => {
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console.info('WS MESSAGE', event)
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if (on_message !== undefined) {
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on_message(event.data)
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}
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else {
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console.warn(['Unhandled message', event])
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}
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return
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}
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const func_on_error = () => {
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console.info('WS ERROR')
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return
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}
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ws.addEventListener('open' , func_on_open)
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ws.addEventListener('close' , func_on_close)
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ws.addEventListener('message', func_on_message)
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ws.addEventListener('error' , func_on_error)
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return
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}
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_teardown_transport () {
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console.info('TEARDOWN TRANSPORT')
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// NOTE: has no effect if ws already closed
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this._ws.close()
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return
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}
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_transport_send_bytes (msg_bytes) {
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const ws = this._ws
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if (ws.readyState === WebSocket.OPEN) {
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ws.send(msg_bytes)
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}
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else {
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console.warn('ws readyState !== OPEN : dropping event send')
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}
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return
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}
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}
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const FRAMEROCK_UTILS = new FramerockUtils()
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do_safereval_strscript({ FRAMEROCK_UTILS }, JS_APP_FRONTEND)
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