Jimmy Wärting
97a084b5e8
* See CHANGELOG for v3.0.0 * removed get-stream * enabled linter just for test.js & from.js * Any blob part is acceptable (jsdoc) since the default fallback is to cast unknown items into strings * async stat version * import from fs/promise instead * Updated the Readme and code examples * known differences, buffer.Blob support, private stream, more test * require node 14 * use fetch v3
76 lines
1.7 KiB
JavaScript
76 lines
1.7 KiB
JavaScript
import {statSync, createReadStream} from 'fs';
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import {stat} from 'fs/promises';
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import DOMException from 'domexception';
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import Blob from './index.js';
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/**
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* @param {string} path filepath on the disk
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* @returns {Blob}
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*/
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const blobFromSync = path => from(statSync(path), path);
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/**
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* @param {string} path filepath on the disk
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* @returns {Promise<Blob>}
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*/
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const blobFrom = path => stat(path).then(stat => from(stat, path));
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const from = (stat, path) => new Blob([new BlobDataItem({
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path,
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size: stat.size,
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lastModified: stat.mtimeMs,
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start: 0
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})]);
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/**
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* This is a blob backed up by a file on the disk
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* with minium requirement. Its wrapped around a Blob as a blobPart
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* so you have no direct access to this.
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*
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* @private
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*/
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class BlobDataItem {
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#path;
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#start;
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constructor(options) {
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this.#path = options.path;
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this.#start = options.start;
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this.size = options.size;
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this.lastModified = options.lastModified
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}
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/**
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* Slicing arguments is first validated and formatted
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* to not be out of range by Blob.prototype.slice
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*/
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slice(start, end) {
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return new BlobDataItem({
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path: this.#path,
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lastModified: this.lastModified,
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size: end - start,
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start
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});
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}
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async * stream() {
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const {mtimeMs} = await stat(this.#path)
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if (mtimeMs > this.lastModified) {
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throw new DOMException('The requested file could not be read, typically due to permission problems that have occurred after a reference to a file was acquired.', 'NotReadableError');
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}
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if (this.size) {
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yield * createReadStream(this.#path, {
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start: this.#start,
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end: this.#start + this.size - 1
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});
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}
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}
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get [Symbol.toStringTag]() {
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return 'Blob';
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}
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}
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export default blobFromSync;
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export {Blob, blobFrom, blobFromSync};
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