acp-sdk/dist/client/sse.js

Agent Communication Protocol SDK

import { EventSourceParserStream } from 'eventsource-parser/stream';
import { SSEError } from './errors.js';

async function createEventSource({
  url,
  fetch = globalThis.fetch,
  options
}) {
  const response = await fetch(url, getFetchOptions(options));
  return {
    response,
    async *consume() {
      if (response.status === 204) {
        throw new SSEError("Server sent HTTP 204, not connecting", response);
      }
      if (!response.ok) {
        throw new SSEError(
          `Non-200 status code (${response.status})`,
          response
        );
      }
      if (!response.headers.get("content-type")?.startsWith("text/event-stream")) {
        throw new SSEError(
          'Invalid content type, expected "text/event-stream"',
          response
        );
      }
      if (!response.body) {
        throw new SSEError("Missing response body", response);
      }
      const stream = response.body.pipeThrough(new TextDecoderStream()).pipeThrough(new EventSourceParserStream({ onError: "terminate" }));
      try {
        for await (const message of stream) {
          yield message;
        }
      } catch (e) {
        const err = e;
        if (err.name !== "AbortError") {
          throw new SSEError(err.message, response, { cause: err });
        } else {
          throw err;
        }
      }
    }
  };
}
function getFetchOptions(options) {
  return {
    ...options,
    headers: { Accept: "text/event-stream", ...options?.headers },
    cache: "no-store"
  };
}

export { createEventSource };
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