ESPTerm web interface submodule, separated to make testing and development easier
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espterm-front-end/jssrc/term_conn.js

136 lines
2.9 KiB

/** Handle connections */
var Conn = (function () {
var ws;
var heartbeatTout;
var pingIv;
var xoff = false;
var autoXoffTout;
var reconTout;
var pageShown = false;
function onOpen(evt) {
console.log("CONNECTED");
heartbeat();
doSend("i");
}
function onClose(evt) {
console.warn("SOCKET CLOSED, code " + evt.code + ". Reconnecting...");
clearTimeout(reconTout);
reconTout = setTimeout(function () {
init();
}, 2000);
// this happens when the buffer gets fucked up via invalid unicode.
// we basically use polling instead of socket then
}
function onMessage(evt) {
try {
// . = heartbeat
switch (evt.data.charAt(0)) {
case 'B':
case 'T':
case 'S':
case 'G':
Screen.load(evt.data);
if(!pageShown) {
showPage();
pageShown = true;
}
break;
case '-':
//console.log('xoff');
xoff = true;
autoXoffTout = setTimeout(function () {
xoff = false;
}, 250);
break;
case '+':
//console.log('xon');
xoff = false;
clearTimeout(autoXoffTout);
break;
}
heartbeat();
} catch (e) {
console.error(e);
}
}
function canSend() {
return !xoff;
}
function doSend(message) {
if (_demo) {
console.log("TX: ", message);
return true; // Simulate success
}
if (xoff) {
// TODO queue
console.log("Can't send, flood control.");
return false;
}
if (!ws) return false; // for dry testing
if (ws.readyState != 1) {
console.error("Socket not ready");
return false;
}
if (typeof message != "string") {
message = JSON.stringify(message);
}
ws.send(message);
return true;
}
function init() {
if (_demo) {
console.log("Demo mode!");
Screen.load(_demo_screen);
showPage();
return;
}
clearTimeout(reconTout);
clearTimeout(heartbeatTout);
ws = new WebSocket("ws://" + _root + "/term/update.ws");
ws.onopen = onOpen;
ws.onclose = onClose;
ws.onmessage = onMessage;
console.log("Opening socket.");
heartbeat();
}
function heartbeat() {
clearTimeout(heartbeatTout);
heartbeatTout = setTimeout(heartbeatFail, 2000);
}
function heartbeatFail() {
console.error("Heartbeat lost, probing server...");
pingIv = setInterval(function () {
console.log("> ping");
$.get('http://' + _root + '/system/ping', function (resp, status) {
if (status == 200) {
clearInterval(pingIv);
console.info("Server ready, reloading page...");
location.reload();
}
}, {
timeout: 100,
});
}, 1000);
}
return {
ws: null,
init: init,
send: doSend,
canSend: canSend, // check flood control
};
})();