69 lines
2.2 KiB
JavaScript
69 lines
2.2 KiB
JavaScript
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function EventReceiver(websocket, poller, channels, last_msg, onmessage) {
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this.websocket_path = websocket;
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this.channels = channels;
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this.last_msg = last_msg;
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this.poller_base = poller;
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this.poller_path = poller + channels.join('|');
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if (onmessage)
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this.onmessage = onmessage;
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var receiver = this;
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function init_poll() {
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function long_poll() {
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$.ajax({
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url: receiver.poller_path,
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data: {last: receiver.last_msg},
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success: function (data, status, jqXHR) {
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receiver.onmessage(data.message);
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receiver.last_msg = data.id;
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long_poll();
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},
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error: function (jqXHR, status, error) {
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if (jqXHR.status == 504)
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long_poll();
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else {
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console.log('Long poll failure: ' + status);
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console.log(jqXHR);
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setTimeout(long_poll, 2000);
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}
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},
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dataType: "json"
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});
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}
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long_poll();
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}
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this.onwsclose = null;
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if (window.WebSocket) {
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this.websocket = new WebSocket(websocket);
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var timeout = setTimeout(function () {
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receiver.websocket.close();
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receiver.websocket = null;
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init_poll();
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}, 2000);
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this.websocket.onopen = function (event) {
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clearTimeout(timeout);
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this.send(JSON.stringify({
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command: 'start-msg',
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start: last_msg
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}));
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this.send(JSON.stringify({
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command: 'set-filter',
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filter: channels
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}));
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};
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this.websocket.onmessage = function (event) {
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var data = JSON.parse(event.data);
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receiver.onmessage(data.message);
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receiver.last_msg = data.id;
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};
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this.websocket.onclose = function (event) {
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if (event.code != 1000 && receiver.onwsclose !== null)
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receiver.onwsclose(event);
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}
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} else {
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this.websocket = null;
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init_poll();
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}
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}
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