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/**
* Copyright (c) 2016 Weitian LI <liweitianux@live.com>
* MIT license
*
* WebSocket codes for the Web UI of "fg21sim"
*/
"use strict";
/**
* Global variable
* FIXME: try to avoid this ...
*/
var ws = null; /* WebSocket */
/* WebSocket reconnection settings */
var ws_reconnect = {
maxTry: 100,
tried: 0,
timeout: 3000, /* ms */
};
/**
* Get the full WebSocket URL from the given URI
*/
var getWebSocketURL = function (uri) {
var proto = {"http:": "ws:", "https:": "wss:"}[location.protocol];
var host = location.hostname;
var port = location.port;
var url = proto + "//" + host + ":" + port + uri;
return url;
};
/**
* Update the contents of element "#ws-status" according to the current
* WebSocket status.
*/
var updateWSStatus = function (action) {
if (action === "open") {
// WebSocket opened and connected
$("#ws-status").removeClass("label-default label-warning label-danger")
.addClass("label-success");
$("#ws-status .icon").removeClass("fa-question-circle fa-warning")
.removeClass("fa-times-circle")
.addClass("fa-check-circle");
$("#ws-status .text").text("Connected");
}
else if (action === "close") {
// WebSocket closed
$("#ws-status").removeClass("label-default label-success label-danger")
.addClass("label-warning");
$("#ws-status .icon").removeClass("fa-question-circle fa-check-circle")
.removeClass("fa-times-circle")
.addClass("fa-warning");
$("#ws-status .text").text("Disconnected!");
}
else if (action === "error") {
// WebSocket encountered error
$("#ws-status").removeClass("label-default label-success label-warning")
.addClass("label-danger");
$("#ws-status .icon").removeClass("fa-question-circle fa-check-circle")
.removeClass("fa-warning")
.addClass("fa-times-circle");
$("#ws-status .text").text("Error!!");
}
else if (action === "unsupported") {
// WebSocket NOT supported
$("#ws-status").removeClass("label-default").addClass("label-danger");
$("#ws-status .icon").removeClass("fa-question-circle")
.addClass("fa-times-circle");
$("#ws-status .text").text("Unsupported!!");
}
else {
console.error("updateWSStatus: Unknown action:", action);
}
};
/**
* Toggle the visibility of element "#ws-status".
*/
var toggleWSReconnect = function (action) {
/**
* Function default parameters: https://stackoverflow.com/a/894877/4856091
*/
action = typeof action !== "undefined" ? action : "toggle";
var target = $("#ws-reconnect");
if (action === "toggle") {
target.toggle();
} else if (action === "show") {
target.show();
} else if (action === "hide") {
target.hide();
} else {
console.error("toggleWSReconnect: Unknown action:", action);
}
};
/**
* Connect to WebSocket and bind functions to events
*/
var connectWebSocket = function (url) {
ws = new WebSocket(url);
ws.onopen = function () {
console.log("Opened WebSocket:", ws.url);
updateWSStatus("open");
toggleWSReconnect("hide");
};
ws.onclose = function (e) {
console.log("WebSocket closed: code:", e.code, ", reason:", e.reason);
updateWSStatus("close");
// Reconnect
if (ws_reconnect.tried < ws_reconnect.maxTry) {
ws_reconnect.tried++;
console.log("Try reconnect the WebSocket: No." + ws_reconnect.tried);
setTimeout(function () { connectWebSocket(url); },
ws_reconnect.timeout);
} else {
console.error("WebSocket already tried allowed maximum times:",
ws_reconnect.maxTry);
toggleWSReconnect("show");
}
};
ws.onerror = function (e) {
console.error("WebSocket encountered error:", e.message);
updateWSStatus("error");
toggleWSReconnect("show");
};
ws.onmessage = function (e) {
var msg = JSON.parse(e.data);
console.log("WebSocket received message: type:", msg.type,
", status:", msg.status);
};
};
$(document).ready(function () {
/**
* Check `WebSocket` support
*/
if (window.WebSocket) {
// WebSocket supported
console.log("Great, WebSocket is supported!");
var ws_url = getWebSocketURL("/ws");
connectWebSocket(ws_url);
// Bind event to the "#ws-reconnect" button
$("#ws-reconnect").on("click", function () {
console.log("WebSocket: reset the tried reconnection counter");
ws_reconnect.tried = 0;
console.log("Manually reconnect the WebSocket:", ws_url);
connectWebSocket(ws_url);
});
} else {
// WebSocket NOT supported
console.error("Oops, WebSocket is NOT supported!");
updateWSStatus("unsupported");
}
});
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