node-web-stream-adapters/lib/cjs/webStreamToReadable.js

Node adapters for web streams

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.webStreamToReadable = void 0;
const stream_1 = require("stream");
/**
 * See https://github.com/comunica/readable-from-web.js/blob/main/lib/ReadableFromWeb.ts
 * MIT License
 */
class ReadableFromWeb extends stream_1.Readable {
    reader;
    readerClosed;
    constructor(stream, options) {
        super(options);
        this.reader = stream.getReader();
        this.readerClosed = false;
        this.reader.closed.then(() => {
            this.readerClosed = true;
        }).catch((error) => {
            this.readerClosed = true;
            this.destroy(error);
        });
    }
    _destroy(error, callback) {
        if (!this.readerClosed) {
            this.reader.cancel(error).then().finally(() => {
                this.readerClosed = true;
                this.reader.releaseLock();
            });
        }
        callback && callback(error);
    }
    _read() {
        this.reader;
        this.reader.read()
            .then(chunk => this.push(chunk.done ? null : chunk.value))
            .catch((error) => this.destroy(error));
    }
}
function webStreamToReadable(stream, options) {
    return new ReadableFromWeb(stream, options);
}
exports.webStreamToReadable = webStreamToReadable;
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