90 lines
2.9 KiB
JavaScript
90 lines
2.9 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.FsaNodeReadStream = void 0;
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const stream_1 = require("stream");
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const Defer_1 = require("../thingies/Defer");
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const concurrency_1 = require("../thingies/concurrency");
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class FsaNodeReadStream extends stream_1.Readable {
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constructor(fs, handle, path, options) {
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super();
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this.fs = fs;
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this.handle = handle;
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this.path = path;
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this.options = options;
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this.__pending__ = true;
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this.__closed__ = false;
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this.__bytes__ = 0;
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this.__mutex__ = (0, concurrency_1.concurrency)(1);
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this.__file__ = new Defer_1.Defer();
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handle
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.then(file => {
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if (this.__closed__)
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return;
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this.__file__.resolve(file);
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if (this.options.fd !== undefined)
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this.emit('open', file.fd);
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this.emit('ready');
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})
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.catch(error => {
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this.__file__.reject(error);
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})
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.finally(() => {
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this.__pending__ = false;
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});
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}
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async __read__() {
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return await this.__mutex__(async () => {
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if (this.__closed__)
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return;
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const { file } = await this.__file__.promise;
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const blob = await file.getFile();
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const buffer = await blob.arrayBuffer();
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const start = this.options.start || 0;
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let end = typeof this.options.end === 'number' ? this.options.end + 1 : buffer.byteLength;
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if (end > buffer.byteLength)
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end = buffer.byteLength;
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const uint8 = new Uint8Array(buffer, start, end - start);
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return uint8;
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});
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}
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__close__() {
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if (this.__closed__)
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return;
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this.__closed__ = true;
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if (this.options.autoClose) {
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this.__file__.promise
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.then(file => {
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this.fs.close(file.fd, () => {
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this.emit('close');
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});
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return file.close();
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})
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.catch(error => { });
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}
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}
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// -------------------------------------------------------------- IReadStream
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get bytesRead() {
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return this.__bytes__;
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}
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get pending() {
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return this.__pending__;
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}
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// ----------------------------------------------------------------- Readable
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_read() {
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this.__read__().then((uint8) => {
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if (this.__closed__)
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return;
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if (!uint8)
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return this.push(null);
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this.__bytes__ += uint8.length;
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this.__close__();
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this.push(uint8);
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this.push(null);
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}, error => {
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this.__close__();
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this.destroy(error);
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});
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}
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}
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exports.FsaNodeReadStream = FsaNodeReadStream;
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//# sourceMappingURL=FsaNodeReadStream.js.map
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