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import { ReadableStream } from "./_shims/index.mjs";
import { AnthropicError } from "./error.mjs";
import { safeJSON, createResponseHeaders } from '@anthropic-ai/sdk/core';
import { APIError } from '@anthropic-ai/sdk/error';
export class Stream {
constructor(iterator, controller) {
this.iterator = iterator;
this.controller = controller;
}
static fromSSEResponse(response, controller) {
let consumed = false;
const decoder = new SSEDecoder();
async function* iterMessages() {
if (!response.body) {
controller.abort();
throw new AnthropicError(`Attempted to iterate over a response with no body`);
}
const lineDecoder = new LineDecoder();
const iter = readableStreamAsyncIterable(response.body);
for await (const chunk of iter) {
for (const line of lineDecoder.decode(chunk)) {
const sse = decoder.decode(line);
if (sse)
yield sse;
}
}
for (const line of lineDecoder.flush()) {
const sse = decoder.decode(line);
if (sse)
yield sse;
}
}
async function* iterator() {
if (consumed) {
throw new Error('Cannot iterate over a consumed stream, use `.tee()` to split the stream.');
}
consumed = true;
let done = false;
try {
for await (const sse of iterMessages()) {
if (sse.event === 'completion') {
try {
yield JSON.parse(sse.data);
}
catch (e) {
console.error(`Could not parse message into JSON:`, sse.data);
console.error(`From chunk:`, sse.raw);
throw e;
}
}
if (sse.event === 'ping') {
continue;
}
if (sse.event === 'error') {
const errText = sse.data;
const errJSON = safeJSON(errText);
const errMessage = errJSON ? undefined : errText;
throw APIError.generate(undefined, errJSON, errMessage, createResponseHeaders(response.headers));
}
}
done = true;
}
catch (e) {
// If the user calls `stream.controller.abort()`, we should exit without throwing.
if (e instanceof Error && e.name === 'AbortError')
return;
throw e;
}
finally {
// If the user `break`s, abort the ongoing request.
if (!done)
controller.abort();
}
}
return new Stream(iterator, controller);
}
// Generates a Stream from a newline-separated ReadableStream where each item
// is a JSON Value.
static fromReadableStream(readableStream, controller) {
let consumed = false;
async function* iterLines() {
const lineDecoder = new LineDecoder();
const iter = readableStreamAsyncIterable(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('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 (e instanceof Error && e.name === 'AbortError')
return;
throw e;
}
finally {
// If the user `break`s, abort the ongoing request.
if (!done)
controller.abort();
}
}
return new Stream(iterator, controller);
}
[Symbol.asyncIterator]() {
return this.iterator();
}
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),
new Stream(() => teeIterator(right), this.controller),
];
}
// 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;
const encoder = new TextEncoder();
return new ReadableStream({
async start() {
iter = self[Symbol.asyncIterator]();
},
async pull(ctrl) {
try {
const { value, done } = await iter.next();
if (done)
return ctrl.close();
const bytes = encoder.encode(JSON.stringify(value) + '\n');
ctrl.enqueue(bytes);
}
catch (err) {
ctrl.error(err);
}
},
async cancel() {
await iter.return?.();
},
});
}
}
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;
}
}
/**
* A re-implementation of httpx's `LineDecoder` in Python that handles incrementally
* reading lines from text.
*
* https://github.com/encode/httpx/blob/920333ea98118e9cf617f246905d7b202510941c/httpx/_decoders.py#L258
*/
class LineDecoder {
constructor() {
this.buffer = [];
this.trailingCR = false;
}
decode(chunk) {
let text = this.decodeText(chunk);
if (this.trailingCR) {
text = '\r' + text;
this.trailingCR = false;
}
if (text.endsWith('\r')) {
this.trailingCR = true;
text = text.slice(0, -1);
}
if (!text) {
return [];
}
const trailingNewline = LineDecoder.NEWLINE_CHARS.has(text[text.length - 1] || '');
let lines = text.split(LineDecoder.NEWLINE_REGEXP);
if (lines.length === 1 && !trailingNewline) {
this.buffer.push(lines[0]);
return [];
}
if (this.buffer.length > 0) {
lines = [this.buffer.join('') + lines[0], ...lines.slice(1)];
this.buffer = [];
}
if (!trailingNewline) {
this.buffer = [lines.pop() || ''];
}
return lines;
}
decodeText(bytes) {
if (bytes == null)
return '';
if (typeof bytes === 'string')
return bytes;
// Node:
if (typeof Buffer !== 'undefined') {
if (bytes instanceof Buffer) {
return bytes.toString();
}
if (bytes instanceof Uint8Array) {
return Buffer.from(bytes).toString();
}
throw new AnthropicError(`Unexpected: received non-Uint8Array (${bytes.constructor.name}) stream chunk in an environment with a global "Buffer" defined, which this library assumes to be Node. Please report this error.`);
}
// Browser
if (typeof TextDecoder !== 'undefined') {
if (bytes instanceof Uint8Array || bytes instanceof ArrayBuffer) {
this.textDecoder ?? (this.textDecoder = new TextDecoder('utf8'));
return this.textDecoder.decode(bytes);
}
throw new AnthropicError(`Unexpected: received non-Uint8Array/ArrayBuffer (${bytes.constructor.name}) in a web platform. Please report this error.`);
}
throw new AnthropicError(`Unexpected: neither Buffer nor TextDecoder are available as globals. Please report this error.`);
}
flush() {
if (!this.buffer.length && !this.trailingCR) {
return [];
}
const lines = [this.buffer.join('')];
this.buffer = [];
this.trailingCR = false;
return lines;
}
}
// prettier-ignore
LineDecoder.NEWLINE_CHARS = new Set(['\n', '\r', '\x0b', '\x0c', '\x1c', '\x1d', '\x1e', '\x85', '\u2028', '\u2029']);
LineDecoder.NEWLINE_REGEXP = /\r\n|[\n\r\x0b\x0c\x1c\x1d\x1e\x85\u2028\u2029]/g;
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, '', ''];
}
/**
* Most browsers don't yet have async iterable support for ReadableStream,
* and Node has a very different way of reading bytes from its "ReadableStream".
*
* This polyfill was pulled from https://github.com/MattiasBuelens/web-streams-polyfill/pull/122#issuecomment-1627354490
*/
function readableStreamAsyncIterable(stream) {
if (stream[Symbol.asyncIterator])
return stream;
const reader = stream.getReader();
return {
async next() {
try {
const result = await reader.read();
if (result?.done)
reader.releaseLock(); // release lock when stream becomes closed
return result;
}
catch (e) {
reader.releaseLock(); // release lock when stream becomes errored
throw e;
}
},
async return() {
const cancelPromise = reader.cancel();
reader.releaseLock();
await cancelPromise;
return { done: true, value: undefined };
},
[Symbol.asyncIterator]() {
return this;
},
};
}
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