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cd6720a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 | // @ts-check
/**
* @param {unknown} value
*/
const getType = (value) => {
if (value === undefined) return 0
if (value === null) return 1
if (isBuffer(value)) return 10
const t = typeof value
if (t === 'boolean') return 2
if (t === 'number') return 3
if (t === 'string') return 4
if (t === 'object') return 6
if (t === 'bigint') return 9
return -1
}
/**
* @param {unknown} value
* @returns {value is Uint8Array}
*/
const isBuffer = (value) => {
const BufferCtor = globalThis.Buffer
if (typeof BufferCtor?.isBuffer === 'function') {
return BufferCtor.isBuffer(value)
}
return value instanceof Uint8Array && value.constructor?.name === 'Buffer'
}
const RESPONSE_HEADER_SIZE = 16
const RESPONSE_PAYLOAD_SIZE = 10240
const RESPONSE_BUFFER_SIZE = RESPONSE_HEADER_SIZE + RESPONSE_PAYLOAD_SIZE
/**
* @param {Int32Array} sab
* @param {Uint8Array} payload
*/
const writeResponsePayload = (sab, payload) => {
if (payload.length > RESPONSE_PAYLOAD_SIZE) {
throw new RangeError('payload overflow')
}
new Uint8Array(sab.buffer).set(payload, RESPONSE_HEADER_SIZE)
}
/**
* @param {import('memfs').IFs} memfs
* @param {any} value
* @param {ReturnType<typeof getType>} type
* @returns {Uint8Array}
*/
const encodeValue = (memfs, value, type) => {
switch (type) {
case 0:
case 1:
return new Uint8Array(0)
case 2: {
const view = new Int32Array(1)
view[0] = value ? 1 : 0
return new Uint8Array(view.buffer)
}
case 3: {
const view = new Float64Array(1)
view[0] = value
return new Uint8Array(view.buffer)
}
case 4: {
const view = new TextEncoder().encode(value)
return view
}
case 10:
return new Uint8Array(value)
case 6: {
function storeConstructor(obj, memfs, processed = new WeakSet()) {
if (!obj || typeof obj !== 'object') {
return
}
if (processed.has(obj)) {
return
}
processed.add(obj)
const [entry] =
Object.entries(memfs).filter(([_, v]) => v === obj.constructor)[0] ??
[]
if (entry) {
Object.defineProperty(obj, '__constructor__', {
configurable: true,
writable: true,
enumerable: true,
value: entry,
})
}
for (const value of Object.values(obj)) {
storeConstructor(value, memfs, processed)
}
}
storeConstructor(value, memfs)
const json = JSON.stringify(value, (_, value) => {
if (typeof value === 'bigint') {
return `BigInt(${String(value)})`
}
if (value instanceof Error) {
return {
...value,
message: value.message,
stack: value.stack,
__error__: value.constructor.name,
}
}
return value
})
const view = new TextEncoder().encode(json)
return view
}
case 9: {
return new TextEncoder().encode(String(value))
}
case -1:
default:
throw new Error('unsupported data')
}
}
/**
* @param {typeof import('memfs')} memfs
* @param {Uint8Array} payload
* @param {number} type
* @returns {any}
*/
const decodeValue = (memfs, payload, type) => {
if (type === 0) return undefined
if (type === 1) return null
if (type === 2)
return Boolean(new Int32Array(payload.buffer, payload.byteOffset, 1)[0])
if (type === 3)
return new Float64Array(payload.buffer, payload.byteOffset, 1)[0]
if (type === 4) return new TextDecoder().decode(payload.slice())
if (type === 10) {
const BufferCtor = globalThis.Buffer
if (typeof BufferCtor?.from === 'function') {
return BufferCtor.from(payload)
}
return payload.slice()
}
if (type === 6) {
const obj = JSON.parse(
new TextDecoder().decode(payload.slice()),
(_key, value) => {
if (typeof value === 'string') {
const matched = value.match(/^BigInt\((-?\d+)\)$/)
if (matched && matched[1]) {
return BigInt(matched[1])
}
}
return value
},
)
function loadConstructor(obj, memfs, processed = new WeakSet()) {
if (!obj || typeof obj !== 'object') {
return
}
if (processed.has(obj)) {
return
}
processed.add(obj)
if (obj.__constructor__) {
const ctor = obj.__constructor__
delete obj.__constructor__
Object.setPrototypeOf(obj, memfs[ctor].prototype)
}
for (const value of Object.values(obj)) {
loadConstructor(value, memfs, processed)
}
}
loadConstructor(obj, memfs)
if (obj.__error__) {
const name = obj.__error__
const ErrorConstructor = globalThis[name] || Error
delete obj.__error__
const err = new ErrorConstructor(obj.message)
Object.defineProperty(err, 'stack', {
configurable: true,
enumerable: false,
writable: true,
value: err.stack,
})
Object.defineProperty(err, Symbol.toStringTag, {
configurable: true,
enumerable: false,
writable: true,
value: name,
})
for (const [k, v] of Object.entries(obj)) {
if (k === 'message' || k === 'stack') continue
err[k] = v
}
return err
}
return obj
}
if (type === 9) {
return BigInt(new TextDecoder().decode(payload.slice()))
}
throw new Error('unsupported data')
}
/**
* @param {import('memfs').IFs} fs
* @returns {(e: { data: { __fs__: { sab: Int32Array, type: keyof import('memfs').IFs, payload: any[] } } }) => void}
*/
// oxlint-disable-next-line no-unused-vars -- fixed in an upcoming release
export const createOnMessage = (fs) =>
function onMessage(e) {
if (e.data.__fs__) {
/**
* 0..4 status(int32_t): 21(waiting) 0(success) 1(error)
* 5..8 type(napi_valuetype): 0(undefined) 1(null) 2(boolean) 3(number) 4(string) 6(jsonstring) 9(bigint) 10(buffer) -1(unsupported)
* 9..16 payload_size(uint32_t) <= 10240
* 16..16 + payload_size payload_content
*/
const { sab, type, payload } = e.data.__fs__
const fn = fs[type]
try {
const ret = fn.apply(fs, payload)
const t = getType(ret)
Atomics.store(sab, 1, t)
const v = encodeValue(fs, ret, t)
Atomics.store(sab, 2, v.length)
writeResponsePayload(sab, v)
Atomics.store(sab, 0, 0) // success
} catch (/** @type {any} */ err) {
let t = getType(err)
let v
try {
if (t === -1) {
throw new Error('unsupported data')
}
v = encodeValue(fs, err, t)
} catch {
const fallback = (() => {
try {
return String(err)
} catch {
return 'Unserializable thrown value'
}
})()
t = getType(fallback)
v = encodeValue(fs, fallback, t)
}
if (v.length > RESPONSE_PAYLOAD_SIZE) {
const overflowErr = new RangeError('payload overflow')
t = getType(overflowErr)
v = encodeValue(fs, overflowErr, t)
}
Atomics.store(sab, 1, t)
Atomics.store(sab, 2, v.length)
writeResponsePayload(sab, v)
Atomics.store(sab, 0, 1) // error
} finally {
Atomics.notify(sab, 0)
}
}
}
/**
* @param {typeof import('memfs')} memfs
*/
export const createFsProxy = (memfs) =>
new Proxy(
{},
{
get(_target, p, _receiver) {
/**
* @param {any[]} args
*/
return function (...args) {
const sab = new SharedArrayBuffer(RESPONSE_BUFFER_SIZE)
const i32arr = new Int32Array(sab)
Atomics.store(i32arr, 0, 21)
postMessage({
__fs__: {
sab: i32arr,
type: p,
payload: args,
},
})
Atomics.wait(i32arr, 0, 21)
const status = Atomics.load(i32arr, 0)
const type = Atomics.load(i32arr, 1)
const size = Atomics.load(i32arr, 2)
const content = new Uint8Array(sab, RESPONSE_HEADER_SIZE, size)
const value = decodeValue(memfs, content, type)
if (status === 1) {
throw value
}
return value
}
},
},
)
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