File size: 9,777 Bytes
3da3d2a d3315b3 3686e29 d3315b3 0b5445b d3315b3 0b5445b 3686e29 2cbf1f4 0b5445b 3da3d2a 0b5445b 3da3d2a 0b5445b c335cf1 3686e29 c335cf1 3da3d2a c335cf1 0b5445b c335cf1 3686e29 c335cf1 0b5445b c335cf1 3686e29 0b5445b c335cf1 0b5445b c335cf1 0b5445b c335cf1 0b5445b c335cf1 3da3d2a c335cf1 3da3d2a c335cf1 2c61080 d3315b3 2cbf1f4 2c61080 2cbf1f4 d3315b3 3686e29 3da3d2a 3686e29 76d2474 3686e29 2c61080 3686e29 2c61080 3686e29 2cbf1f4 3da3d2a 0b5445b d3315b3 3686e29 c335cf1 0b5445b 3da3d2a c335cf1 2cbf1f4 d3315b3 2cbf1f4 c335cf1 d3315b3 3da3d2a d3315b3 3da3d2a 2c61080 3da3d2a d3315b3 | 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 | (function (root) {
"use strict";
function createReaderRequestManager(options = {}) {
const fetchImpl = options.fetchImpl || root.fetch.bind(root);
const AbortControllerImpl = options.AbortControllerImpl || root.AbortController;
const setTimer = options.setTimer || root.setTimeout.bind(root);
const clearTimer = options.clearTimer || root.clearTimeout.bind(root);
const initialIdleMs = options.initialIdleMs || 10000;
const pending = new Map();
const active = new Set();
let disposed = false;
function settle(record) {
if (record.settled) return;
record.settled = true;
clearTimer(record.timeout);
record.clearAttempt?.();
record.removeCallerAbort?.();
active.delete(record);
}
function abort(record, reason) {
if (record.settled) return;
record.controller.abort(reason);
record.abortBody?.(reason);
settle(record);
}
function responseForCaller(record) {
return record.promise.then((response) => {
if (!record.responseClaimed) {
record.responseClaimed = true;
return response;
}
return typeof response?.clone === "function" ? response.clone() : response;
});
}
function wrapResponse(record, response, sourceReader = null, firstChunk = null) {
const ResponseImpl = root.Response || (typeof Response === "function" ? Response : null);
const ReadableStreamImpl =
root.ReadableStream || (typeof ReadableStream === "function" ? ReadableStream : null);
if (!response?.body?.getReader || !ResponseImpl || !ReadableStreamImpl) {
settle(record);
return response;
}
sourceReader ||= response.body.getReader();
const stream = new ReadableStreamImpl({
start(controller) {
record.abortBody = (reason) => {
controller.error(reason);
sourceReader.cancel(reason).catch(() => {});
};
},
async pull(controller) {
try {
const result = firstChunk || await sourceReader.read();
firstChunk = null;
if (record.settled) return;
if (result.done) {
settle(record);
controller.close();
} else {
controller.enqueue(result.value);
}
} catch (error) {
if (record.settled) return;
settle(record);
controller.error(error);
}
},
cancel(reason) {
settle(record);
return sourceReader.cancel(reason);
}
});
return new ResponseImpl(stream, {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
function request(url, timeoutMs, requestInit = {}, bufferLimit = null) {
if (disposed) return Promise.reject(new DOMException("Reader disposed", "AbortError"));
const callerSignal = requestInit.signal;
if (callerSignal?.aborted) return Promise.reject(callerSignal.reason);
// Share plain GETs only. Other options can change the body, validators,
// range or cancellation owner even when the URL is identical.
const shareable = typeof url === "string" && Object.keys(requestInit).every((key) => key === "priority");
const key = shareable ? JSON.stringify([String(url), timeoutMs, bufferLimit]) : {};
if (pending.has(key)) return responseForCaller(pending.get(key));
const controller = new AbortControllerImpl();
const recoverInitial = typeof url === "string" && timeoutMs > initialIdleMs * 2 &&
Object.keys(requestInit).every(key => key === "priority" || key === "signal");
const record = {
controller,
timeout: null,
promise: null,
responseClaimed: false,
settled: false,
abortBody: null
};
async function open() {
for (let attempt = 0; ; attempt++) {
controller.signal.throwIfAborted();
const transport = new AbortControllerImpl();
let idle, sourceReader = null;
const cancel = () => transport.abort(controller.signal.reason);
controller.signal.addEventListener("abort", cancel, { once: true });
record.clearAttempt = () => {
clearTimer(idle);
controller.signal.removeEventListener("abort", cancel);
};
const arm = () => {
clearTimer(idle);
if (recoverInitial && attempt === 0) idle = setTimer(() => transport.abort(
new DOMException("Reader initial response stalled", "TimeoutError")
), initialIdleMs);
};
const owned = (promise, onLate) => new Promise((resolve, reject) => {
const signal = transport.signal;
const aborted = () => reject(signal.reason);
signal.addEventListener("abort", aborted, { once: true });
if (signal.aborted) aborted();
Promise.resolve(promise).then(value => {
if (signal.aborted) onLate?.(value);
else resolve(value);
}, reject).finally(() => signal.removeEventListener("abort", aborted));
});
try {
arm();
const response = await owned(fetchImpl(url, { ...requestInit,
...(attempt ? { cache: "reload" } : {}), signal: transport.signal }),
response => response.body?.cancel(transport.signal.reason).catch(() => {}));
let firstChunk = null;
// Bounded metadata is unpublished until EOF, so a failed body can
// be replaced in full without replaying any caller-visible bytes.
if (bufferLimit !== null && response.ok && response.body?.getReader) {
const tooLarge = () => Object.assign(new Error("READER_RESOURCE_LIMIT"), {code:"READER_RESOURCE_LIMIT"});
if (Number(response.headers.get("Content-Length")) > bufferLimit) {
response.body.cancel().catch(() => {});
throw tooLarge();
}
sourceReader = response.body.getReader();
const chunks = [];
let length = 0;
while (true) {
arm();
const chunk = await owned(sourceReader.read());
if (chunk.done) break;
length += chunk.value.byteLength;
if (length > bufferLimit) throw tooLarge();
chunks.push(chunk.value);
}
controller.signal.throwIfAborted();
sourceReader.releaseLock();
sourceReader = null;
const bytes = new Uint8Array(length);
let offset = 0;
for (const chunk of chunks) { bytes.set(chunk, offset); offset += chunk.byteLength; }
const complete = new root.Response(bytes, {
status:response.status, statusText:response.statusText, headers:response.headers
});
settle(record);
return complete;
}
// Do not publish headers from a stalled attempt: a restart can then
// replace the entire response without mixing versions or body bytes.
if (recoverInitial && response.ok && response.body?.getReader) {
sourceReader = response.body.getReader();
arm();
firstChunk = await owned(sourceReader.read());
}
clearTimer(idle);
controller.signal.throwIfAborted();
return wrapResponse(record, response, sourceReader, firstChunk);
} catch (error) {
record.clearAttempt();
transport.abort(error);
if (sourceReader) {
const reader = sourceReader;
reader.cancel(error).catch(() => {}).finally(() => reader.releaseLock());
}
controller.signal.throwIfAborted();
if (!recoverInitial || attempt || !["TimeoutError", "TypeError"].includes(error?.name)) throw error;
}
}
}
if (callerSignal) {
const onAbort = () => abort(record, callerSignal.reason);
callerSignal.addEventListener("abort", onAbort, { once: true });
record.removeCallerAbort = () => callerSignal.removeEventListener("abort", onAbort);
}
record.timeout = setTimer(
() => abort(record, new DOMException("Reader request timed out", "TimeoutError")),
timeoutMs
);
active.add(record);
record.promise = Promise.resolve()
.then(open)
.catch((error) => {
settle(record);
controller.signal.throwIfAborted();
throw error;
})
.finally(() => {
if (pending.get(key) === record) pending.delete(key);
});
pending.set(key, record);
return responseForCaller(record);
}
function dispose() {
if (disposed) return;
disposed = true;
for (const record of active) abort(record, new DOMException("Reader disposed", "AbortError"));
pending.clear();
}
return Object.freeze({
request,
requestBuffered(url, timeoutMs, limit, requestInit = {}) {
if (!Number.isSafeInteger(limit) || limit < 0) return Promise.reject(new RangeError("Invalid response limit"));
return request(url, timeoutMs, requestInit, limit);
},
dispose,
get pendingCount() {
return pending.size;
},
get activeCount() {
return active.size;
},
get disposed() {
return disposed;
}
});
}
root.VoiceOfMLReaderRequests = Object.freeze({ createReaderRequestManager });
})(typeof self !== "undefined" ? self : globalThis);
|