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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Keeps the websocket connection and allows sending messages
*/
const Connection = {
getUrl() {
var request_error = "";
var server_error = "";
var url = "";
url = document.querySelector('#url').value;
if (!url) {
var http_requester = new XMLHttpRequest();
// Sync request to avoid complexity but is poor form.
try {
http_requester.open("GET", location.origin + '/discover.html', false);
http_requester.send();
}
catch (req_error) {
request_error = "Visual Debugger local server is inaccessible. \n" +
"Please launch the server with command:\n " +
" ./launchdebugger {app_port} {remote_port} \n" +
" remote_port defaults to 7777 \n" +
" corresponds to the chromium command line\n " +
" --remote-debugging-port=7777 \n" +
" app_port defaults to 8777. Currently app_port=" + location.port;
}
if (http_requester.status != 200) {
server_error = "Server reports error=" + http_requester.responseText;
}
else {
var discover_json = JSON.parse(http_requester.responseText);
url = discover_json.webSocketDebuggerUrl;
}
}
const return_strings = [url, request_error, server_error];
return return_strings;
},
startConnection() {
const loop_interval = 3000;
const connect_info = this.getUrl();
if (connect_info[1] != "") {
window.alert(connect_info[1]);
return;
}
if (connect_info[2] != "") {
window.alert(connect_info[2]);
return;
}
url = connect_info[0];
// Create WebSocket connection.
this.socket = new WebSocket(url);
const status = document.querySelector('#connection-status');
const connect = document.querySelector('#connect');
const disconnect = document.querySelector('#disconnect');
this.next_command_id = 1;
// Connection opened
this.socket.addEventListener('open', (event) => {
const message = {};
message['method'] = 'VisualDebugger.startStream';
this.sendMessage(message)
connect.setAttribute('disabled', true);
disconnect.removeAttribute('disabled');
status.classList.remove('disconnected');
});
// Listen for messages
this.socket.addEventListener('message', (event) => {
const json = JSON.parse(event.data);
// We now use devtool events so our frame data is packed
// into the args of the method.
if (json.method === "VisualDebugger.frameResponse") {
const frame_json = json.params.frameData;
if (frame_json.connection == "ok") {
Filter.sendStreamFilters();
} else if (frame_json.frame && frame_json.drawcalls) {
processIncomingFrame(frame_json);
}
}
else if (json.error) {
window.alert("Visual Debugger could not start stream.\n " +
"please add 'use_viz_debugger=true' to args.gn");
console.log(json.error);
this.socket.close();
}
});
this.socket.addEventListener('close', () => {
connect.removeAttribute('disabled');
disconnect.setAttribute('disabled', true);
status.classList.add('disconnected');
// Checks if connection can be made every
// loop_interval number of milliseconds.
var testing = function() {
var interval = setInterval(function() {
if (document.getElementById('autoconnect').checked) {
const test_connect = Connection.getUrl();
if (test_connect[0] != "") {
clearInterval(interval);
Connection.startConnection();
}
}
}, loop_interval);
}
testing();
});
disconnect.addEventListener('click', () => {
const message = {};
message['method'] = 'VisualDebugger.stopStream';
this.sendMessage(message);
document.getElementById('autoconnect').checked = false;
this.socket.close();
});
},
initialize() {
const connect = document.querySelector('#connect');
connect.addEventListener('click', () => {
this.startConnection();
});
},
sendMessage(message) {
if (!this.socket)
return;
message['id'] = this.next_command_id++;
this.socket.send(JSON.stringify(message));
}
};
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