"""N8N Pipe Function for OpenWebUI. This module provides a connector between Open-WebUI and n8n workflows. title: N8N Pipe Function author: Sylvain BOILY (fork from https://openwebui.com/f/coleam/n8n_pipe) author_url: https://github.com/sboily/open-webui-n8n-pipe funding_url: https://github.com/sboily/open-webui-n8n-pipe version: 0.2 """ import logging import time from typing import Any, Awaitable, Callable, Dict, Optional, Union from urllib.parse import urljoin # Add type stubs for missing libraries try: import httpx from pydantic import BaseModel, Field, validator except ImportError: # For type checking only pass # Configure logger logger = logging.getLogger(__name__) class Pipe: """N8N Pipe connector for Open-WebUI. This class implements an asynchronous connector between Open-WebUI and n8n workflows for redirecting chat messages. """ class Valves(BaseModel): """Configuration parameters for the N8N Pipe connector.""" n8n_host: str = Field( default="http://localhost:5678", description="Base URL for n8n server (without trailing slash)", ) n8n_webhook_id: str = Field( default="your-webhook-id", description="Webhook ID from n8n", ) n8n_test_mode: bool = Field( default=False, description="Whether to use test mode URLs for n8n webhooks" # NOQA ) n8n_bearer_token: str = Field( default="your-token-here", description="Bearer token for n8n authentication" # NOQA ) input_field: str = Field( default="chatInput", description="Field name for the input in the JSON payload", ) response_field: str = Field( default="output", description="Field name for the output in the response JSON", ) emit_interval: float = Field( default=2.0, description="Interval in seconds between status emissions" # NOQA ) enable_status_indicator: bool = Field( default=True, description="Enable or disable status indicator emissions" # NOQA ) timeout: float = Field( default=30.0, description="Timeout for HTTP requests in seconds" ) # NOQA max_retries: int = Field( default=2, description="Maximum number of retries for failed requests" # NOQA ) history_limit: int = Field( default=10, description="Maximum number of messages to include in history" # NOQA ) @validator("n8n_host") def validate_host_url(cls, v: str) -> str: """Validate that the n8n host URL includes a protocol. Args: v: The URL to validate Returns: The validated URL if it passes validation Raises: ValueError: If the URL does not start with http:// or https:// """ if not v.startswith(("http://", "https://")): raise ValueError("n8n_host must start with http:// or https://") # NOQA return v def __init__(self) -> None: """Initialize the N8N Pipe connector.""" self.type = "pipe" self.id = "n8n_pipe" self.name = "N8N Pipe" self.valves = self.Valves() self.last_emit_time: float = 0.0 self._http_client = httpx.AsyncClient(timeout=self.valves.timeout) logger.info(f"Initialized {self.name}") async def __aenter__(self) -> "Pipe": """Async context manager entry method. Returns: Self, for use in async with statements """ logger.debug("Entering async context") return self async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None: # NOQA """Async context manager exit method, closes the HTTP client. Args: exc_type: Exception type, if an exception was raised exc_val: Exception value, if an exception was raised exc_tb: Exception traceback, if an exception was raised """ logger.debug("Exiting async context") await self._http_client.aclose() async def emit_status( self, __event_emitter__: Optional[Callable[[dict], Awaitable[None]]], level: str, message: str, done: bool, ) -> None: """Emit status update if conditions are met. Args: __event_emitter__: Callable to emit status events level: Status level (info, warning, error) message: Status description done: Whether this is a completion status """ if not __event_emitter__: return current_time = time.time() if self.valves.enable_status_indicator and ( current_time - self.last_emit_time >= self.valves.emit_interval or done # NOQA ): logger.debug(f"Emitting status: {level} - {message}") await __event_emitter__( { "type": "status", "data": { "status": "complete" if done else "in_progress", "level": level, "description": message, "done": done, }, } ) self.last_emit_time = current_time def get_webhook_url(self) -> str: """Build the n8n webhook URL based on configuration settings. Returns: Complete webhook URL with appropriate path for test or production mode """ base_url = self.valves.n8n_host.rstrip("/") webhook_id = self.valves.n8n_webhook_id path = ( f"/webhook-test/{webhook_id}" if self.valves.n8n_test_mode else f"/webhook/{webhook_id}" # NOQA ) return urljoin(f"{base_url}/", path.lstrip("/")) def _extract_question(self, content: str) -> str: """Extract the actual question from the content string. Args: content: The message content to process Returns: The cleaned question string """ return content.split("Prompt: ")[-1] if "Prompt: " in content else content # NOQA def _create_session_id( self, user: Optional[Dict[str, Any]], first_message: Optional[str] ) -> str: """Create a session identifier for the n8n workflow. Args: user: User information if available first_message: The first message in the conversation Returns: A session identifier string """ user_id = user["id"] if user and "id" in user else "anonymous" message_prefix = "" if first_message: # Clean and truncate the first message clean_message = self._extract_question(first_message)[:100] message_prefix = f" - {clean_message}" return f"{user_id}{message_prefix}" async def _handle_http_error( self, error: Exception, __event_emitter__: Optional[Callable[[dict], Awaitable[None]]], ) -> Dict[str, str]: """Handle HTTP and other errors uniformly. Args: error: The exception that was raised __event_emitter__: Callable to emit status events Returns: Error response dictionary """ error_msg = str(error) logger.error(f"Error in n8n pipe: {error_msg}") await self.emit_status( __event_emitter__, "error", f"Error during sequence execution: {error_msg}", True, ) return {"error": error_msg} async def pipe( self, body: Dict[str, Any], __user__: Optional[Dict[str, Any]] = None, __event_emitter__: Optional[Callable[[dict], Awaitable[None]]] = None, __event_call__: Optional[Callable[[dict], Awaitable[dict]]] = None, ) -> Union[Dict[str, str], str, Any]: """Process the incoming request and return the response from N8N. Args: body: Request body containing messages __user__: User information (optional) __event_emitter__: Callable to emit status events __event_call__: Callable for event calls Returns: N8N response or error dictionary """ await self.emit_status(__event_emitter__, "info", "Calling N8N Workflow...", False) # NOQA messages = body.get("messages", []) # Check if messages list is empty if not messages: await self.emit_status( __event_emitter__, "error", "No messages found in the request body", True, ) # Add response message error_message = "No messages found in the request body" body["messages"] = body.get("messages", []) + [ {"role": "assistant", "content": error_message} ] return {"error": error_message} # Extract the latest question last_message = messages[-1] if last_message.get("role") != "user": await self.emit_status( __event_emitter__, "error", "Last message is not from user", True, ) error_message = "The last message must be from a user" body["messages"].append({"role": "assistant", "content": error_message}) # NOQA return {"error": error_message} question = last_message.get("content", "") question = self._extract_question(question) # If no question content found if not question.strip(): await self.emit_status( __event_emitter__, "warning", "Empty question received", True, ) error_message = "Please provide a non-empty question" body["messages"].append({"role": "assistant", "content": error_message}) # NOQA return {"error": error_message} try: # Extract first message content for session ID first_message_content = "" if messages and messages[0].get("content"): first_message_content = messages[0]["content"] # Create session ID session_id = self._create_session_id(__user__, first_message_content) # NOQA # Prepare the payload payload = {"sessionId": session_id} payload[self.valves.input_field] = question # Get headers headers = { "Authorization": f"Bearer {self.valves.n8n_bearer_token}", "Content-Type": "application/json", } # Get the appropriate webhook URL webhook_url = self.get_webhook_url() logger.info(f"Calling n8n webhook at: {webhook_url}") # Try request with retries n8n_response: Optional[str] = None retry_count = 0 last_error: Optional[Exception] = None while retry_count <= self.valves.max_retries: try: await self.emit_status( __event_emitter__, "info", f"Attempt {retry_count + 1}/{self.valves.max_retries + 1}", # NOQA False, ) # Use httpx for async HTTP request response = await self._http_client.post( webhook_url, json=payload, headers=headers ) # Check status code if response.status_code == 200: response_json = response.json() if self.valves.response_field in response_json: n8n_response = response_json[self.valves.response_field] # NOQA break else: raise KeyError( f"Response field '{self.valves.response_field}'" # NOQA " not found in N8N response" ) else: raise httpx.HTTPStatusError( f"Error: {response.status_code} - {response.text}", request=response.request, response=response, ) except (httpx.HTTPError, KeyError) as e: last_error = e retry_count += 1 if retry_count <= self.valves.max_retries: await self.emit_status( __event_emitter__, "warning", f"Retry {retry_count}/{self.valves.max_retries}", False, ) time.sleep(1) # Simple backoff # If we've exhausted retries if n8n_response is None and last_error is not None: return await self._handle_http_error(last_error, __event_emitter__) # NOQA # Set assistant message with workflow reply body["messages"].append({"role": "assistant", "content": n8n_response}) # NOQA # Limit history if configured if ( self.valves.history_limit > 0 and len(body["messages"]) > self.valves.history_limit # NOQA ): # NOQA body["messages"] = body["messages"][-self.valves.history_limit :] # NOQA await self.emit_status(__event_emitter__, "info", "Complete", True) return n8n_response except Exception as e: return await self._handle_http_error(e, __event_emitter__)