@copilotkit/runtime/dist/v2/runtime/handlers/shared/sse-response.mjs.map

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{"version":3,"file":"sse-response.mjs","names":[],"sources":["../../../../../src/v2/runtime/handlers/shared/sse-response.ts"],"sourcesContent":["import { BaseEvent } from \"@ag-ui/client\";\nimport { EventEncoder } from \"@ag-ui/encoder\";\nimport { Observable, Subscription } from \"rxjs\";\nimport { ResolvedDebugConfig } from \"@copilotkit/shared\";\nimport {\n  createLogger,\n  type CopilotRuntimeLogger,\n} from \"../../../../lib/logger\";\nimport { telemetry } from \"../../telemetry\";\nimport { DebugEventBus } from \"../../core/debug-event-bus\";\n\ninterface CreateSseEventResponseParams {\n  request: Request;\n  observableFactory: () =>\n    | Promise<Observable<BaseEvent>>\n    | Observable<BaseEvent>;\n  debugEventBus?: DebugEventBus;\n  agentId?: string;\n  debug?: ResolvedDebugConfig;\n  /** Pre-created logger instance to avoid creating a new pino logger per request. */\n  logger?: CopilotRuntimeLogger;\n}\n\nexport function createSseEventResponse({\n  request,\n  observableFactory,\n  debugEventBus,\n  agentId,\n  debug,\n  logger,\n}: CreateSseEventResponseParams): Response {\n  const stream = new TransformStream();\n  const writer = stream.writable.getWriter();\n  const encoder = new EventEncoder();\n  let streamClosed = false;\n  let debugThreadId = \"\";\n  let debugRunId = \"\";\n\n  const debugLogger = debug?.enabled\n    ? (logger ??\n      createLogger({ level: \"debug\", component: \"copilotkit-debug\" }))\n    : undefined;\n\n  const closeStream = async () => {\n    if (!streamClosed) {\n      try {\n        await writer.close();\n        streamClosed = true;\n      } catch {\n        // Stream already closed.\n      }\n    }\n  };\n\n  const logError = (error: unknown) => {\n    console.error(\"Error running agent:\", error);\n    console.error(\n      \"Error stack:\",\n      error instanceof Error ? error.stack : \"No stack trace\",\n    );\n    console.error(\"Error details:\", {\n      name: error instanceof Error ? error.name : \"Unknown\",\n      message: error instanceof Error ? error.message : String(error),\n      cause: error instanceof Error ? error.cause : undefined,\n    });\n  };\n\n  let subscription: Subscription | undefined;\n\n  (async () => {\n    const observable = await observableFactory();\n\n    telemetry.capture(\"oss.runtime.agent_execution_stream_started\", {});\n\n    if (debug?.lifecycle) {\n      debugLogger!.debug(\"SSE stream opened\");\n    }\n\n    let eventCount = 0;\n    let loggedEventCount = 0;\n\n    subscription = observable.subscribe({\n      next: async (event) => {\n        // Extract threadId/runId from RUN_STARTED\n        if (event.type === \"RUN_STARTED\") {\n          const e = event as { threadId?: string; runId?: string };\n          debugThreadId = e.threadId ?? \"\";\n          debugRunId = e.runId ?? \"\";\n        }\n\n        // Broadcast to debug listeners BEFORE the stream-closed gate below.\n        // Intentional: debug subscribers (e.g. the VS Code Inspector panel)\n        // should still receive trailing events after the SSE client for\n        // this request closed its connection — they're independent\n        // consumers observing the underlying runtime, not the request's\n        // response stream.\n        //\n        // Wrapped in try/catch so a buggy debug subscriber can't propagate\n        // an exception into this observer — if the throw reached the\n        // `next` callback it would get routed to `error` by RxJS, closing\n        // the SSE stream for an unrelated reason. Log via `logError` and\n        // move on.\n        if (debugEventBus) {\n          try {\n            debugEventBus.broadcast(event, {\n              agentId: agentId ?? \"\",\n              threadId: debugThreadId,\n              runId: debugRunId,\n            });\n          } catch (broadcastError) {\n            logError(broadcastError);\n          }\n        }\n\n        if (!request.signal.aborted && !streamClosed) {\n          try {\n            eventCount++;\n            if (debug?.events) {\n              loggedEventCount++;\n              if (debug.verbose) {\n                debugLogger!.debug({ event }, \"Event emitted\");\n              } else {\n                debugLogger!.debug(\n                  { type: event.type, ...summarizeEvent(event) },\n                  \"Event emitted\",\n                );\n              }\n            }\n            await writer.write(encoder.encode(event));\n          } catch (error) {\n            if (error instanceof Error && error.name === \"AbortError\") {\n              streamClosed = true;\n            } else {\n              // Non-abort write failures (backpressure disconnects,\n              // transform-stream exceptions, …) were previously swallowed\n              // silently — `streamClosed` stayed `false` and the next\n              // event re-attempted a broken writer. Log and mark the\n              // stream closed so we stop trying.\n              logError(error);\n              streamClosed = true;\n            }\n          }\n        }\n      },\n      error: async (error) => {\n        telemetry.capture(\"oss.runtime.agent_execution_stream_errored\", {\n          error: error instanceof Error ? error.message : String(error),\n        });\n        if (debug?.lifecycle) {\n          debugLogger!.debug(\n            { error: error instanceof Error ? error.message : String(error) },\n            \"SSE stream errored\",\n          );\n        }\n        logError(error);\n        await closeStream();\n      },\n      complete: async () => {\n        telemetry.capture(\"oss.runtime.agent_execution_stream_ended\", {});\n        if (debug?.lifecycle) {\n          debugLogger!.debug(\n            { eventCount, loggedEventCount },\n            \"SSE stream completed\",\n          );\n        }\n        await closeStream();\n      },\n    });\n\n    // If the client disconnected before the subscription was created,\n    // unsubscribe immediately to avoid leaking the observable.\n    if (request.signal.aborted) {\n      subscription.unsubscribe();\n    }\n  })().catch(async (error) => {\n    logError(error);\n    await closeStream();\n  });\n\n  request.signal.addEventListener(\"abort\", () => {\n    subscription?.unsubscribe();\n  });\n\n  return new Response(stream.readable, {\n    status: 200,\n    headers: {\n      \"Content-Type\": \"text/event-stream\",\n      \"Cache-Control\": \"no-cache\",\n      Connection: \"keep-alive\",\n    },\n  });\n}\n\nfunction summarizeEvent(event: BaseEvent): Record<string, unknown> {\n  const e = event as any;\n  const summary: Record<string, unknown> = {};\n\n  if (e.messageId) summary.messageId = e.messageId;\n  if (e.toolCallId) summary.toolCallId = e.toolCallId;\n  if (e.toolCallName) summary.toolCallName = e.toolCallName;\n  if (e.role) summary.role = e.role;\n  if (e.delta != null && typeof e.delta === \"string\")\n    summary.deltaLength = e.delta.length;\n  if (e.snapshot && typeof e.snapshot === \"object\")\n    summary.snapshotKeys = Object.keys(e.snapshot);\n  if (e.delta && Array.isArray(e.delta))\n    summary.operationCount = e.delta.length;\n  if (e.threadId) summary.threadId = e.threadId;\n  if (e.runId) summary.runId = e.runId;\n  if (e.message) summary.message = e.message;\n  if (e.code) summary.code = e.code;\n  if (e.stepName) summary.stepName = e.stepName;\n\n  return 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