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https://github.com/open-webui/pipelines
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Create langflow_pipeline.py
add langflow pipelines integration example
This commit is contained in:
Artur Zdolinski
GitHub
parent
c98ca763bc
commit
269e170642
159
examples/pipelines/integrations/langflow_pipeline.py
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159
examples/pipelines/integrations/langflow_pipeline.py
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import argparse
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import logging
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import time
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from typing import Union, Generator, Iterator, Optional
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from pprint import pprint
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import requests, json, warnings
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# Langflow API Docs:
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# https://docs.langflow.org/workspace-api
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# Disable SSL verification warnings
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warnings.filterwarnings('ignore', message='Unverified HTTPS request')
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def is_healthy(url, verify_ssl=True):
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"""Check if the Langflow server is healthy."""
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try:
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response = requests.get(url, verify=verify_ssl)
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return response.status_code == 200
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except Exception as e:
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print(f"Error checking health: {str(e)}")
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return False
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def get_flow_components(url, verify_ssl=True):
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"""Get the flow components IDs from the Langflow server."""
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try:
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response = requests.get(url, headers={"Content-Type": "application/json"}, verify=verify_ssl)
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response.raise_for_status()
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data = response.json()
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# Create dictionary of component IDs with empty objects
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components = {}
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for node in data.get('data', {}).get('nodes', []):
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component_id = node.get('data', {}).get('id')
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if component_id:
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components[component_id] = {}
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return components
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except Exception as e:
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print(f"Error getting flow components: {str(e)}")
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return {}
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class Pipeline:
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def __init__(self):
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self.name = "Langflow Chat"
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self.langflow_host = "http://langflow.host"
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self.flow_id = "28eeaa04-...-...-...-9a5f257dd17c"
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self.api_url_run = self.langflow_host+"/api/v1/run"
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self.api_url_flow = self.langflow_host+"/api/v1/flows"
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self.api_health = self.langflow_host+"/health"
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self.api_request_stream = True
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self.verify_ssl = False
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self.debug = False
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async def on_startup(self):
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print(f"on_startup: {__name__}")
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# Wait for Langflow server to be healthy
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healthy = is_healthy(self.api_health, self.verify_ssl)
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while not healthy:
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time.sleep(5)
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healthy = is_healthy(self.api_health)
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print("Langflow server is healthy")
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async def on_shutdown(self):
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print(f"on_shutdown: {__name__}")
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pass
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async def inlet(self, body: dict, user: Optional[dict] = None) -> dict:
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# This function is called before the OpenAI API request is made. You can modify the form data before it is sent to the OpenAI API.
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print(f"inlet: {__name__}")
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if self.debug:
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print(f"inlet: {__name__} - body:")
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pprint(body)
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print(f"inlet: {__name__} - user:")
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pprint(user)
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return body
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async def outlet(self, body: dict, user: Optional[dict] = None) -> dict:
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# This function is called after the OpenAI API response is completed. You can modify the messages after they are received from the OpenAI API.
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print(f"outlet: {__name__}")
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if self.debug:
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print(f"outlet: {__name__} - body:")
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pprint(body)
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print(f"outlet: {__name__} - user:")
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pprint(user)
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return body
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def pipe(self, user_message: str, model_id: str, messages: list, body: dict) -> Union[str, Generator, Iterator]:
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"""Process the user message through the Langflow pipeline."""
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print(f"Processing message with {self.name}")
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if self.debug is True:
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print(f"User message: {user_message}")
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print(f"Model ID: {model_id}")
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print(f"Messages: {messages}")
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print(f"Body: {body}")
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session_id = body.get("chat_id")
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# If you need to tune components in flow / use `get_flow_components` to collect IDs
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TWEAKS_COMPONENTS = get_flow_components(url=self.api_url_flow+"/"+self.flow_id, verify_ssl=self.verify_ssl)
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data = {
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"input_value": user_message,
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"output_type": "chat",
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"input_type": "chat",
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"session_id": session_id,
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"tweaks": TWEAKS_COMPONENTS
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}
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try:
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# Make the initial request to run flow via Langflow API ChatInput box
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url = f"{self.api_url_run}/{self.flow_id}?stream={str(self.api_request_stream).lower()}"
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headers = {"Content-Type": "application/json"}
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response = requests.post(url, json=data, headers=headers, verify=self.verify_ssl)
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response.raise_for_status()
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if response.status_code == 200:
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init_data = response.json()
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if self.debug is True:
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print(f"pipe: {__name__} - langflow init response: "+str(init_data))
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# Check for stream URL in the response
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outputs = init_data.get("outputs", [{}])[0].get("outputs", [{}])[0]
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stream_url = outputs.get("artifacts", {}).get("stream_url")
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if not stream_url:
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message = outputs.get("messages", [])[0].get("message")
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if message is not None:
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yield message
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return
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logging.error("No stream URL returned")
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yield "Error: No stream URL available"
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return
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# Stream the response
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stream_url = f"{self.langflow_host}{stream_url}"
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params = {"session_id": session_id}
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print(f"Stream the response session_id: {session_id} - {stream_url}")
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with requests.get(stream_url, headers=headers, params=params, stream=True, verify=self.verify_ssl) as stream:
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for line in stream.iter_lines(decode_unicode=True):
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if line.startswith('data: '):
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try:
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# Remove 'data: ' prefix and parse JSON
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json_data = json.loads(line.replace('data: ', ''))
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# Extract chunk
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if 'chunk' in json_data:
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yield json_data['chunk']
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if 'message' in json_data:
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if json_data['message'] == 'Stream closed':
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print(f"Stream session {session_id} closed")
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return
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except json.JSONDecodeError:
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print(f"Failed to parse JSON: {line}")
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else:
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yield f"Error: Request failed with status code {response.status_code}"
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except Exception as e:
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logging.error(f"Error in pipe: {str(e)}")
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yield f"Error: {str(e)}"
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