@signalk/streams/dist/filestream.js

Utilities for handling streams of Signal K data

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const fs_1 = require("fs");
const path_1 = require("path");
const stream_1 = require("stream");
class EndIgnoringPassThrough extends stream_1.PassThrough {
    end() {
        return this;
    }
}
class FileStream {
    options;
    keepRunning;
    pipeTo = null;
    endIgnoringPassThrough = null;
    filestream = null;
    constructor(options) {
        this.options = options;
        this.keepRunning = options.keepRunning ?? true;
    }
    pipe(pipeTo) {
        this.pipeTo = pipeTo;
        this.endIgnoringPassThrough = new EndIgnoringPassThrough();
        this.endIgnoringPassThrough.pipe(pipeTo);
        this.startStream();
        return pipeTo;
    }
    startStream() {
        let filename;
        if ((0, path_1.isAbsolute)(this.options.filename)) {
            filename = this.options.filename;
        }
        else {
            filename = (0, path_1.join)(this.options.app.config.configPath, this.options.filename);
            if (!(0, fs_1.existsSync)(filename)) {
                filename = (0, path_1.join)(__dirname, '..', this.options.filename);
            }
        }
        this.filestream = (0, fs_1.createReadStream)(filename);
        this.filestream.on('error', (err) => {
            console.error(err.message);
            this.keepRunning = false;
        });
        if (this.keepRunning) {
            this.filestream.on('end', () => this.startStream());
        }
        this.filestream.pipe(this.endIgnoringPassThrough);
    }
    end() {
        if (this.pipeTo) {
            this.pipeTo.end();
        }
        if (this.filestream) {
            this.filestream.close();
        }
    }
}
exports.default = FileStream;