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88 lines
3.3 KiB
Python
88 lines
3.3 KiB
Python
# coding=utf-8
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"""
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@project: maxkb
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@Author：虎
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@file： utils.py
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@date：2024/6/6 15:15
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@desc:
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"""
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import json
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from typing import Iterator
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from django.http import StreamingHttpResponse
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from langchain_core.messages import BaseMessageChunk, BaseMessage
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from application.flow.i_step_node import WorkFlowPostHandler
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from common.response import result
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def event_content(chat_id, chat_record_id, response, workflow,
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write_context,
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post_handler: WorkFlowPostHandler):
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"""
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用于处理流式输出
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@param chat_id: 会话id
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@param chat_record_id: 对话记录id
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@param response: 响应数据
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@param workflow: 工作流管理器
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@param write_context 写入节点上下文
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@param post_handler: 后置处理器
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"""
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answer = ''
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try:
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for chunk in response:
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answer += chunk.content
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yield 'data: ' + json.dumps({'chat_id': str(chat_id), 'id': str(chat_record_id), 'operate': True,
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'content': chunk.content, 'is_end': False}, ensure_ascii=False) + "\n\n"
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write_context(answer, 200)
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post_handler.handler(chat_id, chat_record_id, answer, workflow)
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yield 'data: ' + json.dumps({'chat_id': str(chat_id), 'id': str(chat_record_id), 'operate': True,
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'content': '', 'is_end': True}, ensure_ascii=False) + "\n\n"
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except Exception as e:
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answer = str(e)
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write_context(answer, 500)
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post_handler.handler(chat_id, chat_record_id, answer, workflow)
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yield 'data: ' + json.dumps({'chat_id': str(chat_id), 'id': str(chat_record_id), 'operate': True,
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'content': answer, 'is_end': True}, ensure_ascii=False) + "\n\n"
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def to_stream_response(chat_id, chat_record_id, response: Iterator[BaseMessageChunk], workflow, write_context,
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post_handler):
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"""
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将结果转换为服务流输出
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@param chat_id: 会话id
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@param chat_record_id: 对话记录id
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@param response: 响应数据
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@param workflow: 工作流管理器
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@param write_context 写入节点上下文
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@param post_handler: 后置处理器
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@return: 响应
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"""
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r = StreamingHttpResponse(
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streaming_content=event_content(chat_id, chat_record_id, response, workflow, write_context, post_handler),
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content_type='text/event-stream;charset=utf-8',
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charset='utf-8')
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r['Cache-Control'] = 'no-cache'
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return r
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def to_response(chat_id, chat_record_id, response: BaseMessage, workflow, write_context,
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post_handler: WorkFlowPostHandler):
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"""
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将结果转换为服务输出
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@param chat_id: 会话id
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@param chat_record_id: 对话记录id
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@param response: 响应数据
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@param workflow: 工作流管理器
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@param write_context 写入节点上下文
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@param post_handler: 后置处理器
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@return: 响应
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"""
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answer = response.content
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write_context(answer)
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post_handler.handler(chat_id, chat_record_id, answer, workflow)
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return result.success({'chat_id': str(chat_id), 'id': str(chat_record_id), 'operate': True,
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'content': answer, 'is_end': True})
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