n8n-nodes-tail/dist/nodes/Tail/Tail.node.js

Tail trigger

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Tail = void 0;
const child_process_1 = require("child_process");
class Tail {
    constructor() {
        this.description = {
            displayName: 'Tail Trigger',
            name: 'tail',
            icon: 'fa:terminal',
            group: ['trigger'],
            version: 1,
            triggerPanel: true,
            subtitle: '={{$parameter["file"]}}',
            description: 'Starts the workflow when lines are added to this file',
            defaults: {
                name: 'Tail Trigger',
            },
            inputs: ['main'],
            outputs: ['main'],
            properties: [
                {
                    displayName: 'Directory',
                    name: 'directory',
                    type: 'string',
                    default: '/home/user/',
                    required: true,
                    description: 'Define a working directory',
                },
                {
                    displayName: 'File',
                    name: 'file',
                    type: 'string',
                    default: 'file.log',
                    required: true,
                    description: 'Specify a file to monitor for real-time updates',
                },
                {
                    displayName: 'Options',
                    name: 'options',
                    type: 'collection',
                    placeholder: 'Add option',
                    default: {},
                    options: [
                        {
                            displayName: 'Last Lines',
                            name: 'last',
                            type: 'number',
                            default: 0,
                            description: 'How many last lines are loaded on startup?',
                        },
                    ],
                },
            ],
        };
    }
    async trigger() {
        const directory = this.getNodeParameter('directory');
        const file = this.getNodeParameter('file');
        const options = this.getNodeParameter('options');
        const last = options.last || 0;
        const args = ['-f', '-n', last.toString(), directory + file];
        console.log(`Tail process starting on ${directory}${file}`);
        let child = (0, child_process_1.spawn)('tail', args);
        child.stderr.pipe(process.stderr);
        child.stdout.on('data', (data) => {
            console.log(data.toString());
            const lines = data
                .toString()
                .split('\n')
                .filter((line) => line.trim() !== '');
            for (const line of lines) {
                this.emit([this.helpers.returnJsonArray([{ line: line }])]);
            }
        });
        child.on('close', (code, signal) => {
            console.log(`Tail process terminated on ${directory}${file}`);
        });
        child.stderr.on('data', (error) => {
            closeFunction();
            this.emitError(new Error(error.toString()));
        });
        async function closeFunction() {
            child.kill('SIGHUP');
        }
        return {
            closeFunction,
        };
    }
}
exports.Tail = Tail;
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