FM / core

/opt/canhelp/node_modules/@anthropic-ai/sdk/src/core/

/opt/canhelp/node_modules/@anthropic-ai/sdk/src/core

Name	Size	Mode	Actions
api-promise.ts	3662	0644	edit dl rm
error.ts	4105	0644	edit dl rm
pagination.ts	7303	0644	edit dl rm
README.md	100	0644	edit dl rm
resource.ts	277	0644	edit dl rm
streaming.ts	9682	0644	edit dl rm
uploads.ts	119	0644	edit dl rm

Edit: /opt/canhelp/node_modules/@anthropic-ai/sdk/src/core/streaming.ts (9682B)

import { AnthropicError } from './error';
import { type ReadableStream } from '../internal/shim-types';
import { makeReadableStream } from '../internal/shims';
import { findDoubleNewlineIndex, LineDecoder } from '../internal/decoders/line';
import { ReadableStreamToAsyncIterable } from '../internal/shims';
import { isAbortError } from '../internal/errors';
import { safeJSON } from '../internal/utils/values';
import { encodeUTF8 } from '../internal/utils/bytes';
import { loggerFor } from '../internal/utils/log';
import type { BaseAnthropic } from '../client';

import { APIError } from './error';

type Bytes = string | ArrayBuffer | Uint8Array | null | undefined;

export type ServerSentEvent = {
  event: string | null;
  data: string;
  raw: string[];
};

export class Stream<Item> implements AsyncIterable<Item> {
  controller: AbortController;
  #client: BaseAnthropic | undefined;

constructor(
    private iterator: () => AsyncIterator<Item>,
    controller: AbortController,
    client?: BaseAnthropic,
  ) {
    this.controller = controller;
    this.#client = client;
  }

static fromSSEResponse<Item>(
    response: Response,
    controller: AbortController,
    client?: BaseAnthropic,
  ): Stream<Item> {
    let consumed = false;
    const logger = client ? loggerFor(client) : console;

async function* iterator(): AsyncIterator<Item, any, undefined> {
      if (consumed) {
        throw new AnthropicError('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 (sse.event === 'completion') {
            try {
              yield JSON.parse(sse.data) as Item;
            } catch (e) {
              logger.error(`Could not parse message into JSON:`, sse.data);
              logger.error(`From chunk:`, sse.raw);
              throw e;
            }
          }

if (
            sse.event === 'message_start' ||
            sse.event === 'message_delta' ||
            sse.event === 'message_stop' ||
            sse.event === 'content_block_start' ||
            sse.event === 'content_block_delta' ||
            sse.event === 'content_block_stop'
          ) {
            try {
              yield JSON.parse(sse.data) as Item;
            } catch (e) {
              logger.error(`Could not parse message into JSON:`, sse.data);
              logger.error(`From chunk:`, sse.raw);
              throw e;
            }
          }

if (sse.event === 'ping') {
            continue;
          }

if (sse.event === 'error') {
            throw new APIError(undefined, safeJSON(sse.data) ?? sse.data, undefined, response.headers);
          }
        }
        done = true;
      } catch (e) {
        // If the user calls `stream.controller.abort()`, we should exit without throwing.
        if (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<Item>(
    readableStream: ReadableStream,
    controller: AbortController,
    client?: BaseAnthropic,
  ): Stream<Item> {
    let consumed = false;

async function* iterLines(): AsyncGenerator<string, void, unknown> {
      const lineDecoder = new LineDecoder();

const iter = ReadableStreamToAsyncIterable<Bytes>(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(): AsyncIterator<Item, any, undefined> {
      if (consumed) {
        throw new AnthropicError('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) as Item;
        }
        done = true;
      } catch (e) {
        // If the user calls `stream.controller.abort()`, we should exit without throwing.
        if (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);
  }

[Symbol.asyncIterator](): AsyncIterator<Item> {
    return this.iterator();
  }

/**
   * Splits the stream into two streams which can be
   * independently read from at different speeds.
   */
  tee(): [Stream<Item>, Stream<Item>] {
    const left: Array<Promise<IteratorResult<Item>>> = [];
    const right: Array<Promise<IteratorResult<Item>>> = [];
    const iterator = this.iterator();

return [
      new Stream(() => teeIterator(left), this.controller, this.#client),
      new Stream(() => teeIterator(right), this.controller, this.#client),
    ];
  }

/**
   * 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(): ReadableStream {
    const self = this;
    let iter: AsyncIterator<Item>;

return makeReadableStream({
      async start() {
        iter = self[Symbol.asyncIterator]();
      },
      async pull(ctrl: any) {
        try {
          const { value, done } = await iter.next();
          if (done) return ctrl.close();

const bytes = encodeUTF8(JSON.stringify(value) + '\n');

ctrl.enqueue(bytes);
        } catch (err) {
          ctrl.error(err);
        }
      },
      async cancel() {
        await iter.return?.();
      },
    });
  }
}

export async function* _iterSSEMessages(
  response: Response,
  controller: AbortController,
): AsyncGenerator<ServerSentEvent, void, unknown> {
  if (!response.body) {
    controller.abort();
    if (
      typeof (globalThis as any).navigator !== 'undefined' &&
      (globalThis as any).navigator.product === 'ReactNative'
    ) {
      throw new AnthropicError(
        `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 AnthropicError(`Attempted to iterate over a response with no body`);
  }

const sseDecoder = new SSEDecoder();
  const lineDecoder = new LineDecoder();

const iter = ReadableStreamToAsyncIterable<Bytes>(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: AsyncIterableIterator<Bytes>): AsyncGenerator<Uint8Array> {
  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' ? 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 = findDoubleNewlineIndex(data)) !== -1) {
      yield data.slice(0, patternIndex);
      data = data.slice(patternIndex);
    }
  }

if (data.length > 0) {
    yield data;
  }
}

class SSEDecoder {
  private data: string[];
  private event: string | null;
  private chunks: string[];

constructor() {
    this.event = null;
    this.data = [];
    this.chunks = [];
  }

decode(line: string) {
    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: ServerSentEvent = {
        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: string, delimiter: string): [string, string, string] {
  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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