95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
export const defaultRunner = function(target, configuration, isClosed) {
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if (isClosed(target)) {
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target.dispatchEvent({ type: 'close' });
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return;
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}
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// TODO Consider wrapping this is a promise for none thenable returns
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return target.source
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.bind(target)(configuration, target)
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.then(function(res) {
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return defaultRunner(target, configuration, isClosed);
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});
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};
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const errorEvent = function(e) {
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return new ErrorEvent('error', {
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error: e,
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message: e.message,
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});
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};
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const isClosed = function(target) {
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switch (target.readyState) {
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case 2: // CLOSED
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case 3: // CLOSING
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return true;
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}
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return false;
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};
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export default function(
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EventTarget,
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P = Promise,
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run = defaultRunner,
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createErrorEvent = errorEvent
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) {
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const CallableEventSource = function(source, configuration = {}) {
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EventTarget.call(this);
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this.readyState = 2;
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this.source =
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typeof source !== 'function'
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? function(configuration, target) {
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this.close();
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return P.resolve();
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}
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: source;
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this.readyState = 0; // CONNECTING
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P.resolve()
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.then(() => {
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// if we are already closed, don't do anything
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if (this.readyState > 1) {
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return;
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}
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this.readyState = 1; // open
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// the connection _was just_ opened
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this.dispatchEvent({ type: 'open' });
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return run(this, configuration, isClosed);
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})
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.catch(e => {
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this.dispatchEvent(createErrorEvent(e));
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// close after the dispatch so we can tell if it was an error whilst closed or not
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// but make sure its before the promise tick
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this.readyState = 2; // CLOSE
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this.dispatchEvent({ type: 'close' });
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})
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.then(() => {
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// This only gets called when the promise chain completely finishes
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// so only when its completely closed.
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this.readyState = 2; // CLOSE
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});
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};
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CallableEventSource.prototype = Object.assign(
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Object.create(EventTarget.prototype, {
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constructor: {
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value: CallableEventSource,
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configurable: true,
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writable: true,
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},
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}),
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{
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close: function() {
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// additional readyState 3 = CLOSING
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switch (this.readyState) {
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case 0: // CONNECTING
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case 2: // CLOSED
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this.readyState = 2;
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break;
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default:
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// OPEN
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this.readyState = 3; // CLOSING
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}
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// non-standard
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return this;
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},
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}
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);
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return CallableEventSource;
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}
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