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| Viewing file: Select action/file-type: "use strict";
var _Stream_client;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Stream = void 0;
exports._iterSSEMessages = _iterSSEMessages;
const tslib_1 = require("../internal/tslib.js");
const error_1 = require("./error.js");
const shims_1 = require("../internal/shims.js");
const line_1 = require("../internal/decoders/line.js");
const shims_2 = require("../internal/shims.js");
const errors_1 = require("../internal/errors.js");
const bytes_1 = require("../internal/utils/bytes.js");
const log_1 = require("../internal/utils/log.js");
const error_2 = require("./error.js");
class Stream {
constructor(iterator, controller, client) {
this.iterator = iterator;
_Stream_client.set(this, void 0);
this.controller = controller;
tslib_1.__classPrivateFieldSet(this, _Stream_client, client, "f");
}
static fromSSEResponse(response, controller, client) {
let consumed = false;
const logger = client ? (0, log_1.loggerFor)(client) : console;
async function* iterator() {
if (consumed) {
throw new error_1.OpenAIError('Cannot iterate over a consumed stream, use `.tee()` to split the stream.');
}
consumed = true;
let done = false;
try {
for await (const sse of _iterSSEMessages(response, controller)) {
if (done)
continue;
if (sse.data.startsWith('[DONE]')) {
done = true;
continue;
}
if (sse.event === null || !sse.event.startsWith('thread.')) {
let data;
try {
data = JSON.parse(sse.data);
}
catch (e) {
logger.error(`Could not parse message into JSON:`, sse.data);
logger.error(`From chunk:`, sse.raw);
throw e;
}
if (data && data.error) {
throw new error_2.APIError(undefined, data.error, undefined, response.headers);
}
yield data;
}
else {
let data;
try {
data = JSON.parse(sse.data);
}
catch (e) {
console.error(`Could not parse message into JSON:`, sse.data);
console.error(`From chunk:`, sse.raw);
throw e;
}
// TODO: Is this where the error should be thrown?
if (sse.event == 'error') {
throw new error_2.APIError(undefined, data.error, data.message, undefined);
}
yield { event: sse.event, data: data };
}
}
done = true;
}
catch (e) {
// If the user calls `stream.controller.abort()`, we should exit without throwing.
if ((0, errors_1.isAbortError)(e))
return;
throw e;
}
finally {
// If the user `break`s, abort the ongoing request.
if (!done)
controller.abort();
}
}
return new Stream(iterator, controller, client);
}
/**
* Generates a Stream from a newline-separated ReadableStream
* where each item is a JSON value.
*/
static fromReadableStream(readableStream, controller, client) {
let consumed = false;
async function* iterLines() {
const lineDecoder = new line_1.LineDecoder();
const iter = (0, shims_2.ReadableStreamToAsyncIterable)(readableStream);
for await (const chunk of iter) {
for (const line of lineDecoder.decode(chunk)) {
yield line;
}
}
for (const line of lineDecoder.flush()) {
yield line;
}
}
async function* iterator() {
if (consumed) {
throw new error_1.OpenAIError('Cannot iterate over a consumed stream, use `.tee()` to split the stream.');
}
consumed = true;
let done = false;
try {
for await (const line of iterLines()) {
if (done)
continue;
if (line)
yield JSON.parse(line);
}
done = true;
}
catch (e) {
// If the user calls `stream.controller.abort()`, we should exit without throwing.
if ((0, errors_1.isAbortError)(e))
return;
throw e;
}
finally {
// If the user `break`s, abort the ongoing request.
if (!done)
controller.abort();
}
}
return new Stream(iterator, controller, client);
}
[(_Stream_client = new WeakMap(), Symbol.asyncIterator)]() {
return this.iterator();
}
/**
* Splits the stream into two streams which can be
* independently read from at different speeds.
*/
tee() {
const left = [];
const right = [];
const iterator = this.iterator();
const teeIterator = (queue) => {
return {
next: () => {
if (queue.length === 0) {
const result = iterator.next();
left.push(result);
right.push(result);
}
return queue.shift();
},
};
};
return [
new Stream(() => teeIterator(left), this.controller, tslib_1.__classPrivateFieldGet(this, _Stream_client, "f")),
new Stream(() => teeIterator(right), this.controller, tslib_1.__classPrivateFieldGet(this, _Stream_client, "f")),
];
}
/**
* Converts this stream to a newline-separated ReadableStream of
* JSON stringified values in the stream
* which can be turned back into a Stream with `Stream.fromReadableStream()`.
*/
toReadableStream() {
const self = this;
let iter;
return (0, shims_1.makeReadableStream)({
async start() {
iter = self[Symbol.asyncIterator]();
},
async pull(ctrl) {
try {
const { value, done } = await iter.next();
if (done)
return ctrl.close();
const bytes = (0, bytes_1.encodeUTF8)(JSON.stringify(value) + '\n');
ctrl.enqueue(bytes);
}
catch (err) {
ctrl.error(err);
}
},
async cancel() {
await iter.return?.();
},
});
}
}
exports.Stream = Stream;
async function* _iterSSEMessages(response, controller) {
if (!response.body) {
controller.abort();
if (typeof globalThis.navigator !== 'undefined' &&
globalThis.navigator.product === 'ReactNative') {
throw new error_1.OpenAIError(`The default react-native fetch implementation does not support streaming. Please use expo/fetch: https://docs.expo.dev/versions/latest/sdk/expo/#expofetch-api`);
}
throw new error_1.OpenAIError(`Attempted to iterate over a response with no body`);
}
const sseDecoder = new SSEDecoder();
const lineDecoder = new line_1.LineDecoder();
const iter = (0, shims_2.ReadableStreamToAsyncIterable)(response.body);
for await (const sseChunk of iterSSEChunks(iter)) {
for (const line of lineDecoder.decode(sseChunk)) {
const sse = sseDecoder.decode(line);
if (sse)
yield sse;
}
}
for (const line of lineDecoder.flush()) {
const sse = sseDecoder.decode(line);
if (sse)
yield sse;
}
}
/**
* Given an async iterable iterator, iterates over it and yields full
* SSE chunks, i.e. yields when a double new-line is encountered.
*/
async function* iterSSEChunks(iterator) {
let data = new Uint8Array();
for await (const chunk of iterator) {
if (chunk == null) {
continue;
}
const binaryChunk = chunk instanceof ArrayBuffer ? new Uint8Array(chunk)
: typeof chunk === 'string' ? (0, bytes_1.encodeUTF8)(chunk)
: chunk;
let newData = new Uint8Array(data.length + binaryChunk.length);
newData.set(data);
newData.set(binaryChunk, data.length);
data = newData;
let patternIndex;
while ((patternIndex = (0, line_1.findDoubleNewlineIndex)(data)) !== -1) {
yield data.slice(0, patternIndex);
data = data.slice(patternIndex);
}
}
if (data.length > 0) {
yield data;
}
}
class SSEDecoder {
constructor() {
this.event = null;
this.data = [];
this.chunks = [];
}
decode(line) {
if (line.endsWith('\r')) {
line = line.substring(0, line.length - 1);
}
if (!line) {
// empty line and we didn't previously encounter any messages
if (!this.event && !this.data.length)
return null;
const sse = {
event: this.event,
data: this.data.join('\n'),
raw: this.chunks,
};
this.event = null;
this.data = [];
this.chunks = [];
return sse;
}
this.chunks.push(line);
if (line.startsWith(':')) {
return null;
}
let [fieldname, _, value] = partition(line, ':');
if (value.startsWith(' ')) {
value = value.substring(1);
}
if (fieldname === 'event') {
this.event = value;
}
else if (fieldname === 'data') {
this.data.push(value);
}
return null;
}
}
function partition(str, delimiter) {
const index = str.indexOf(delimiter);
if (index !== -1) {
return [str.substring(0, index), delimiter, str.substring(index + delimiter.length)];
}
return [str, '', ''];
}
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