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Convert to TypeScript #12

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Convert to TypeScript #12

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299 changes: 141 additions & 158 deletions index.js
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Original file line number Diff line number Diff line change
@@ -1,168 +1,151 @@
const queueMicrotask = require('queue-microtask')

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const queue_microtask_1 = __importDefault(require("queue-microtask"));
class WebFsChunkStore {
constructor (chunkLength, opts = {}) {
this.chunkLength = Number(chunkLength)

if (!this.chunkLength) {
throw new Error('First argument must be a chunk length')
}

this.closed = false
this.length = Number(opts.length) || Infinity

if (this.length !== Infinity) {
this.lastChunkLength = this.length % this.chunkLength || this.chunkLength
this.lastChunkIndex = Math.ceil(this.length / this.chunkLength) - 1
}

this.name = opts.name || 'default'

this.rootDirPromise = opts.rootDir || navigator.storage.getDirectory()
this.storageDirPromise = this._getStorageDirectoryHandle()

this.chunks = []
}

async _getStorageDirectoryHandle () {
const rootDir = await this.rootDirPromise
return await rootDir.getDirectoryHandle(this.name, { create: true })
}

async _getChunk (index) {
let chunk = this.chunks[index]

if (!chunk) {
const fileName = index.toString()
const storageDir = await this.storageDirPromise

chunk = this.chunks[index] = {
fileHandlePromise: storageDir.getFileHandle(fileName, { create: true })
}
}

return chunk
}

put (index, buf, cb = () => {}) {
if (this.closed) {
queueMicrotask(() => cb(new Error('Storage is closed')))
return
}

const isLastChunk = index === this.lastChunkIndex
if (isLastChunk && buf.length !== this.lastChunkLength) {
queueMicrotask(() => {
cb(new Error(`Last chunk length must be ${this.lastChunkLength}`))
})
return
constructor(chunkLength, opts = {}) {
this.chunkLength = Number(chunkLength);
if (!this.chunkLength) {
throw new Error('First argument must be a chunk length');
}
this.closed = false;
this.length = Number(opts.length) || Infinity;
if (this.length !== Infinity) {
this.lastChunkLength = this.length % this.chunkLength || this.chunkLength;
this.lastChunkIndex = Math.ceil(this.length / this.chunkLength) - 1;
}
this.name = opts.name || 'default';
this.rootDirPromise = opts.rootDir || navigator.storage.getDirectory();
this.storageDirPromise = this._getStorageDirectoryHandle();
this.chunks = [];
}
if (!isLastChunk && buf.length !== this.chunkLength) {
queueMicrotask(() => {
cb(new Error(`Chunk length must be ${this.chunkLength}`))
})
return
async _getStorageDirectoryHandle() {
const rootDir = await this.rootDirPromise;
return await rootDir.getDirectoryHandle(this.name, { create: true });
}

;(async () => {
try {
const chunk = await this._getChunk(index)
const fileHandle = await chunk.fileHandlePromise
const stream = await fileHandle.createWritable({
keepExistingData: false
})
await stream.write(buf)
await stream.close()
} catch (err) {
cb(err)
return
}

cb(null)
})()
}

get (index, opts, cb = () => {}) {
if (typeof opts === 'function') {
return this.get(index, null, opts)
async _getChunk(index) {
let chunk = this.chunks[index];
if (!chunk) {
const fileName = index.toString();
const storageDir = await this.storageDirPromise;
chunk = this.chunks[index] = {
fileHandlePromise: storageDir.getFileHandle(fileName, { create: true })
};
}
return chunk;
}
if (this.closed) {
queueMicrotask(() => cb(new Error('Storage is closed')))
return
put(index, buf, cb = () => { }) {
if (this.closed) {
(0, queue_microtask_1.default)(() => cb(new Error('Storage is closed')));
return;
}
const isLastChunk = index === this.lastChunkIndex;
if (isLastChunk && buf.length !== this.lastChunkLength) {
(0, queue_microtask_1.default)(() => {
cb(new Error(`Last chunk length must be ${this.lastChunkLength}`));
});
return;
}
if (!isLastChunk && buf.length !== this.chunkLength) {
(0, queue_microtask_1.default)(() => {
cb(new Error(`Chunk length must be ${this.chunkLength}`));
});
return;
}
;
(async () => {
try {
const chunk = await this._getChunk(index);
const fileHandle = await chunk.fileHandlePromise;
const stream = await fileHandle.createWritable({
keepExistingData: false
});
await stream.write(buf);
await stream.close();
}
catch (err) {
cb(err);
return;
}
cb(null);
})();
}

const isLastChunk = index === this.lastChunkIndex
const chunkLength = isLastChunk ? this.lastChunkLength : this.chunkLength

if (!opts) opts = {}

const offset = opts.offset || 0
const len = opts.length || chunkLength - offset

;(async () => {
let buf
try {
const chunk = await this._getChunk(index)
const fileHandle = await chunk.fileHandlePromise
let file = await fileHandle.getFile()
if (offset !== 0 || len !== chunkLength) {
file = file.slice(offset, len + offset)
get(index, opts, cb = () => { }) {
var _a;
if (typeof opts === 'function') {
this.get(index, null, opts);
return;
}
buf = await file.arrayBuffer()
} catch (err) {
cb(err)
return
}

if (buf.byteLength === 0) {
const err = new Error(`Index ${index} does not exist`)
err.notFound = true
cb(err)
return
}

cb(null, Buffer.from(buf))
})()
}

close (cb = () => {}) {
if (this.closed) {
queueMicrotask(() => cb(new Error('Storage is closed')))
return
if (this.closed) {
(0, queue_microtask_1.default)(() => cb(new Error('Storage is closed')));
return;
}
const isLastChunk = index === this.lastChunkIndex;
const chunkLength = (_a = (isLastChunk
? this.lastChunkLength
: this.chunkLength)) !== null && _a !== void 0 ? _a : this.chunkLength;
if (!opts)
opts = {};
const offset = opts.offset || 0;
const len = opts.length || chunkLength - offset;
(async () => {
let buf;
try {
const chunk = await this._getChunk(index);
const fileHandle = await chunk.fileHandlePromise;
let file = await fileHandle.getFile();
if (offset !== 0 || len !== chunkLength) {
file = file.slice(offset, len + offset);
}
buf = await file.arrayBuffer();
}
catch (err) {
cb(err);
return;
}
if (buf.byteLength === 0) {
const err = new Error(`Index ${index} does not exist`);
err.notFound = true;
cb(err);
return;
}
cb(null, Buffer.from(buf));
})();
}

this.closed = true
this.chunks = []

queueMicrotask(() => {
cb(null)
})
}

destroy (cb = () => {}) {
if (this.closed) {
queueMicrotask(() => cb(new Error('Storage is closed')))
return
close(cb = () => { }) {
if (this.closed) {
(0, queue_microtask_1.default)(() => cb(new Error('Storage is closed')));
return;
}
this.closed = true;
this.chunks = [];
(0, queue_microtask_1.default)(() => {
cb(null);
});
}

const handleClose = async err => {
if (err) {
cb(err)
return
}

try {
const rootDir = await this.rootDirPromise
await rootDir.removeEntry(this.name, { recursive: true })
} catch (err) {
cb(err)
return
}
cb(null)
destroy(cb = () => { }) {
if (this.closed) {
(0, queue_microtask_1.default)(() => cb(new Error('Storage is closed')));
return;
}
const handleClose = async (err) => {
if (err) {
cb(err);
return;
}
try {
const rootDir = await this.rootDirPromise;
await rootDir.removeEntry(this.name, { recursive: true });
}
catch (err) {
cb(err);
return;
}
cb(null);
};
this.close(handleClose);
}

this.close(handleClose)
}
}

module.exports = WebFsChunkStore
exports.default = WebFsChunkStore;
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