mirror of
https://github.com/langbot-app/LangBot.git
synced 2026-06-02 03:55:55 +00:00
161 lines
6.5 KiB
Python
161 lines
6.5 KiB
Python
from __future__ import annotations
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import typing
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import json
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import uuid
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import aiohttp
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from .. import runner
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from ...core import app
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from .. import entities as llm_entities
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import langbot_plugin.api.entities.builtin.pipeline.query as pipeline_query
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class N8nAPIError(Exception):
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"""N8n API 请求失败"""
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def __init__(self, message: str):
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self.message = message
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super().__init__(self.message)
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@runner.runner_class('n8n-service-api')
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class N8nServiceAPIRunner(runner.RequestRunner):
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"""N8n Service API 工作流请求器"""
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def __init__(self, ap: app.Application, pipeline_config: dict):
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self.ap = ap
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self.pipeline_config = pipeline_config
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# 获取webhook URL
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self.webhook_url = self.pipeline_config['ai']['n8n-service-api']['webhook-url']
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# 获取超时设置，默认为120秒
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self.timeout = self.pipeline_config['ai']['n8n-service-api'].get('timeout', 120)
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# 获取输出键名，默认为response
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self.output_key = self.pipeline_config['ai']['n8n-service-api'].get('output-key', 'response')
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# 获取认证类型，默认为none
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self.auth_type = self.pipeline_config['ai']['n8n-service-api'].get('auth-type', 'none')
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# 根据认证类型获取相应的认证信息
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if self.auth_type == 'basic':
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self.basic_username = self.pipeline_config['ai']['n8n-service-api'].get('basic-username', '')
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self.basic_password = self.pipeline_config['ai']['n8n-service-api'].get('basic-password', '')
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elif self.auth_type == 'jwt':
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self.jwt_secret = self.pipeline_config['ai']['n8n-service-api'].get('jwt-secret', '')
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self.jwt_algorithm = self.pipeline_config['ai']['n8n-service-api'].get('jwt-algorithm', 'HS256')
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elif self.auth_type == 'header':
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self.header_name = self.pipeline_config['ai']['n8n-service-api'].get('header-name', '')
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self.header_value = self.pipeline_config['ai']['n8n-service-api'].get('header-value', '')
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async def _preprocess_user_message(self, query: pipeline_query.Query) -> str:
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"""预处理用户消息，提取纯文本
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Returns:
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str: 纯文本消息
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"""
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plain_text = ''
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if isinstance(query.user_message.content, list):
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for ce in query.user_message.content:
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if ce.type == 'text':
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plain_text += ce.text
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# 注意：n8n webhook目前不支持直接处理图片，如需支持可在此扩展
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elif isinstance(query.user_message.content, str):
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plain_text = query.user_message.content
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return plain_text
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async def _call_webhook(self, query: pipeline_query.Query) -> typing.AsyncGenerator[llm_entities.Message, None]:
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"""调用n8n webhook"""
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# 生成会话ID（如果不存在）
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if not query.session.using_conversation.uuid:
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query.session.using_conversation.uuid = str(uuid.uuid4())
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# 预处理用户消息
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plain_text = await self._preprocess_user_message(query)
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# 准备请求数据
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payload = {
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# 基本消息内容
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'message': plain_text,
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'user_message_text': plain_text,
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'conversation_id': query.session.using_conversation.uuid,
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'session_id': query.variables.get('session_id', ''),
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'user_id': f'{query.session.launcher_type.value}_{query.session.launcher_id}',
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'msg_create_time': query.variables.get('msg_create_time', ''),
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}
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# 添加所有变量到payload
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payload.update(query.variables)
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try:
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# 准备请求头和认证信息
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headers = {}
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auth = None
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# 根据认证类型设置相应的认证信息
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if self.auth_type == 'basic':
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# 使用Basic认证
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auth = aiohttp.BasicAuth(self.basic_username, self.basic_password)
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self.ap.logger.debug(f'using basic auth: {self.basic_username}')
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elif self.auth_type == 'jwt':
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# 使用JWT认证
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import jwt
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import time
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# 创建JWT令牌
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payload_jwt = {
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'exp': int(time.time()) + 3600, # 1小时过期
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'iat': int(time.time()),
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'sub': 'n8n-webhook',
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}
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token = jwt.encode(payload_jwt, self.jwt_secret, algorithm=self.jwt_algorithm)
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# 添加到Authorization头
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headers['Authorization'] = f'Bearer {token}'
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self.ap.logger.debug('using jwt auth')
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elif self.auth_type == 'header':
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# 使用自定义请求头认证
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headers[self.header_name] = self.header_value
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self.ap.logger.debug(f'using header auth: {self.header_name}')
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else:
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self.ap.logger.debug('no auth')
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# 调用webhook
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async with aiohttp.ClientSession() as session:
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async with session.post(
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self.webhook_url, json=payload, headers=headers, auth=auth, timeout=self.timeout
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) as response:
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if response.status != 200:
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error_text = await response.text()
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self.ap.logger.error(f'n8n webhook call failed: {response.status}, {error_text}')
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raise Exception(f'n8n webhook call failed: {response.status}, {error_text}')
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# 解析响应
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response_data = await response.json()
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self.ap.logger.debug(f'n8n webhook response: {response_data}')
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# 从响应中提取输出
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if self.output_key in response_data:
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output_content = response_data[self.output_key]
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else:
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# 如果没有指定的输出键，则使用整个响应
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output_content = json.dumps(response_data, ensure_ascii=False)
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# 返回消息
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yield llm_entities.Message(
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role='assistant',
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content=output_content,
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)
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except Exception as e:
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self.ap.logger.error(f'n8n webhook call exception: {str(e)}')
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raise N8nAPIError(f'n8n webhook call exception: {str(e)}')
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async def run(self, query: pipeline_query.Query) -> typing.AsyncGenerator[llm_entities.Message, None]:
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"""运行请求"""
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async for msg in self._call_webhook(query):
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yield msg
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