classy-pay-core/lib/utils/PipeHelpers.js

Shared tools used in ClassyPay-related projects

"use strict";
// tslint:disable no-console
Object.defineProperty(exports, "__esModule", { value: true });
exports.writableStream = exports.readableStream = exports.parallelTransform = void 0;
const ParallelTransform = require("parallel-transform");
const stream = require("stream");
const utils_1 = require("./utils");
const parallelTransform = (concurrency, handler) => new ParallelTransform(concurrency, {
    objectMode: true,
}, async (data, callback) => {
    (0, utils_1.unpromisify)(async () => await handler(data), callback);
});
exports.parallelTransform = parallelTransform;
const readableStream = (handler) => new stream.Readable({
    objectMode: true,
    async read() {
        let value;
        try {
            value = await handler();
        }
        catch (error) {
            console.error(`Error reading from stream: ${error}`);
        }
        if (value) {
            this.push(value);
        }
        else {
            this.destroy();
        }
    },
});
exports.readableStream = readableStream;
const writableStream = (handler) => new stream.Writable({
    objectMode: true,
    async write(chunk, encoding, callback) {
        (0, utils_1.unpromisify)(async () => {
            await handler(chunk);
        }, callback);
    },
});
exports.writableStream = writableStream;
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