@signalk/streams/dist/folderstream.js

Utilities for handling streams of Signal K data

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const fs_1 = require("fs");
const stream_1 = require("stream");
class FolderStream extends stream_1.Transform {
    folder;
    fileIndex = 0;
    constructor(options) {
        super({ objectMode: false });
        this.folder = options.folder;
    }
    pipe(pipeTo) {
        const files = (0, fs_1.readdirSync)(this.folder);
        const pipeNextFile = () => {
            const file = files[this.fileIndex];
            if (!file) {
                pipeTo.end();
                return;
            }
            const fileStream = (0, fs_1.createReadStream)(this.folder + '/' + file);
            fileStream.pipe(pipeTo, { end: false });
            fileStream.on('end', () => {
                this.fileIndex++;
                if (this.fileIndex === files.length) {
                    pipeTo.end();
                }
                else {
                    pipeNextFile();
                }
            });
        };
        pipeNextFile();
        return pipeTo;
    }
}
exports.default = FolderStream;