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72 lines
2.5 KiB
TypeScript
72 lines
2.5 KiB
TypeScript
import EventSource from 'eventsource';
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import type {
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IDataObject,
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ITriggerFunctions,
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INodeType,
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INodeTypeDescription,
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ITriggerResponse,
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} from 'n8n-workflow';
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import { jsonParse } from 'n8n-workflow';
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export class SseTrigger implements INodeType {
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description: INodeTypeDescription = {
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displayName: 'SSE Trigger',
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name: 'sseTrigger',
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icon: 'fa:cloud-download-alt',
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group: ['trigger'],
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version: 1,
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description: 'Triggers the workflow when Server-Sent Events occur',
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eventTriggerDescription: '',
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activationMessage: 'You can now make calls to your SSE URL to trigger executions.',
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defaults: {
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name: 'SSE Trigger',
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color: '#225577',
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},
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triggerPanel: {
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header: '',
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executionsHelp: {
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inactive:
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"<b>While building your workflow</b>, click the 'listen' button, then trigger an SSE event. This will trigger an execution, which will show up in this editor.<br /> <br /><b>Once you're happy with your workflow</b>, <a data-key='activate'>activate</a> it. Then every time a change is detected, the workflow will execute. These executions will show up in the <a data-key='executions'>executions list</a>, but not in the editor.",
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active:
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"<b>While building your workflow</b>, click the 'listen' button, then trigger an SSE event. This will trigger an execution, which will show up in this editor.<br /> <br /><b>Your workflow will also execute automatically</b>, since it's activated. Every time a change is detected, this node will trigger an execution. These executions will show up in the <a data-key='executions'>executions list</a>, but not in the editor.",
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},
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activationHint:
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"Once you’ve finished building your workflow, <a data-key='activate'>activate</a> it to have it also listen continuously (you just won’t see those executions here).",
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},
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inputs: [],
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outputs: ['main'],
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properties: [
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{
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displayName: 'URL',
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name: 'url',
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type: 'string',
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default: '',
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placeholder: 'http://example.com',
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description: 'The URL to receive the SSE from',
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required: true,
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},
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],
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};
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async trigger(this: ITriggerFunctions): Promise<ITriggerResponse> {
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const url = this.getNodeParameter('url') as string;
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const eventSource = new EventSource(url);
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eventSource.onmessage = (event) => {
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const eventData = jsonParse<IDataObject>(event.data as string, {
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errorMessage: 'Invalid JSON for event data',
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});
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this.emit([this.helpers.returnJsonArray([eventData])]);
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};
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async function closeFunction() {
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eventSource.close();
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}
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return {
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closeFunction,
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};
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}
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}
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