使用fastapi搭建ChatGPT对话后台

Joker-Tong2024-09-27 15:30

使用fastapi搭建ChatGPT对话后台

参考资料：使用fastapi搭建ChatGPT对话后台

效果：在本地构建网页达成类似chatgpt的对话效果，一个字一个字的返回生成结果

ChatGPT初步调用

python 复制代码 
import os
import fastapi
import dotenv
from httpx import AsyncClient
from typing import List,Dict
dotenv.load_dotenv('./env')

# print(os.getenv('OPENAI_API_BASE'))
async def request(val: List[dict[str,str]]):
    """
    发起请求
    val: 对话内容
    """
    url = "https://xiaoai.plus/v1/chat/completions"
    headers ={
        "Content-Type": "application/json",
        "Authorization": "Bearer " + os.getenv("OPENAI_API_KEY")
    }
    params = {
        "model": "gpt-3.5-turbo",
        "messages": val, # [{"role": "user", "content": "Say this is a test!"}]
        "temperature": 0.7,
        "n": 1,
        "max_tokens": 3000,
        "stream": False
    }
    async with AsyncClient() as clinet:
        response = await clinet.post(url, headers=headers,json=params,timeout=60)
        print(response.json())

if __name__ == '__main__':
    import asyncio
    asyncio.run(request([{"role": "user", "content": "Hello!"}]))
bash 复制代码 
{'id': 'chatcmpl-ABYGZNDqhtZn5igtaukBbLPWrdTPZ', 'object': 'chat.completion', 'created': 1727316691, 'model': 'gpt-3.5-turbo', 'choices': [{'index': 0, 'message': {'role': 'assistant', 'content': 'Hello! How can I assist you today?'}, 'finish_reason': 'stop'}], 'usage': {'prompt_tokens': 9, 'completion_tokens': 9, 'total_tokens': 18}, 'system_fingerprint': 'fp_808245b034'}

对回答进行解析, 这里的结果是一次性返回消息内容

bash 复制代码 
{
    "id": "chatcmpl-ABYGZNDqhtZn5igtaukBbLPWrdTPZ",  # 唯一标识符，用于追踪请求
    "object": "chat.completion",  # 对象类型，表示这是一个聊天完成事件
    "created": 1727316691,  # 创建时间戳，表示响应创建的时间
    "model": "gpt-3.5-turbo",  # 使用的模型名称
    "choices": [  # 选择列表，可能包含多个回复，这里只有一个
        {
            "index": 0,  # 当前选择的索引
            "message": {  # 选择的消息内容
                "role": "assistant",  # 消息角色，这里是助手
                "content": "Hello! How can I assist you today?"  # 消息内容
            },
            "finish_reason": "stop"  # 完成原因，这里是"stop"，表示模型决定停止生成更多内容
        }
    ],
    "usage": {  # 使用情况，包括token使用情况
        "prompt_tokens": 9,  # 提示token的数量
        "completion_tokens": 9,  # 完成token的数量
        "total_tokens": 18  # 总token的数量
    },
    "system_fingerprint": "fp_808245b034"  # 系统指纹，用于识别请求的系统环境
}

流式调用ChatGPT

修改上述代码中的"stream": True与print(response.text)部分

python 复制代码 
import os
import fastapi
import dotenv
from httpx import AsyncClient
from typing import List,Dict
dotenv.load_dotenv('./env')

# print(os.getenv('OPENAI_API_BASE'))
async def request(val: List[dict[str,str]]):
    """
    发起请求
    val: 对话内容
    """
    url = "https://xiaoai.plus/v1/chat/completions"
    headers ={
        "Content-Type": "application/json",
        "Authorization": "Bearer " + os.getenv("OPENAI_API_KEY")
    }
    params = {
        "model": "gpt-3.5-turbo",
        "messages": val, # [{"role": "user", "content": "Say this is a test!"}]
        "temperature": 0.7,
        "n": 1,
        "max_tokens": 3000,
        "stream": True
    }
    async with AsyncClient() as clinet:
        response = await clinet.post(url, headers=headers,json=params,timeout=60)
        print(response.text)

if __name__ == '__main__':
    import asyncio
    asyncio.run(request([{"role": "user", "content": "Hello!"}]))

可以看到GPT的结果是一个词一个词的返回的

bash 复制代码 
data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":"Hello"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":"!"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":" How"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":" can"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":" I"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":" assist"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":" you"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":" today"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{"content":"?"},"finish_reason":null}]}

data: {"id":"chatcmpl-ABYJD1L22azzx2PK9IyqCaw2RrC7J","object":"chat.completion.chunk","created":1727316855,"model":"gpt-3.5-turbo","system_fingerprint":"fp_808245b034","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}

data: [DONE]

逐行处理流式响应

修改相应的代码

python 复制代码 
    # async with AsyncClient() as clinet:
    #     response = await clinet.post(url, headers=headers,json=params,timeout=60)
    #     print(response.text)
    async with AsyncClient() as clinet:
        async with clinet.stream("POST", url, headers=headers, json=params, timeout=60) as response:
            async for line in response.aiter_lines():
                print(line)
python 复制代码 
import os
import fastapi
import dotenv
from httpx import AsyncClient
from typing import List,Dict
import json
from collections import defaultdict
dotenv.load_dotenv('./env')

# print(os.getenv('OPENAI_API_BASE'))
async def request(val: List[dict[str,str]]):
    """
    发起请求
    val: 对话内容
    """
    url = "https://xiaoai.plus/v1/chat/completions"
    headers ={
        "Content-Type": "application/json",
        "Authorization": "Bearer " + os.getenv("OPENAI_API_KEY")
    }
    params = {
        "model": "gpt-3.5-turbo",
        "messages": val, # [{"role": "user", "content": "Say this is a test!"}]
        "temperature": 0.7,
        "n": 1,
        "max_tokens": 3000,
        "stream": True
    }
    # async with AsyncClient() as clinet:
    #     response = await clinet.post(url, headers=headers,json=params,timeout=60)
    #     print(response.text)
    async with AsyncClient() as clinet:
        async with clinet.stream("POST", url, headers=headers, json=params, timeout=60) as response:
            async for line in response.aiter_lines():
                if line.strip() == "":
                    continue
                line = line.replace("data: ","")
                if line.strip() == "[DONE]":
                    return
                data = json.loads(line)
                if data.get("choices") is None or len(data.get("choices")) == 0 or data.get("choices")[0].get("finish_reason") is not None:
                    return
                yield data.get("choices")[0]

async def chat(inp: str):
    message = [{"role": "user", "content": inp}]
    async for i in request(message):
        print(i)
if __name__ == '__main__':
    import asyncio
    asyncio.run(chat("你好啊"))
bash 复制代码 
{'index': 0, 'delta': {'role': 'assistant', 'content': ''}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '你'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '好'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '，'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '有'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '什'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '么'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '可以'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '帮'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '助'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '你'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '的'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '吗'}, 'finish_reason': None}
{'index': 0, 'delta': {'content': '？'}, 'finish_reason': None}

封装请求与chat方法

python 复制代码 
import os
import fastapi
import dotenv
from httpx import AsyncClient
from typing import List,Dict
import json
from collections import defaultdict
dotenv.load_dotenv('./env')

# print(os.getenv('OPENAI_API_BASE'))
async def request(val: List[dict[str,str]]):
    """
    发起请求
    val: 对话内容
    """
    url = "https://xiaoai.plus/v1/chat/completions"
    headers ={
        "Content-Type": "application/json",
        "Authorization": "Bearer " + os.getenv("OPENAI_API_KEY")
    }
    params = {
        "model": "gpt-3.5-turbo",
        "messages": val, # [{"role": "user", "content": "Say this is a test!"}]
        "temperature": 0.7,
        "n": 1,
        "max_tokens": 3000,
        "stream": True
    }
    # async with AsyncClient() as clinet:
    #     response = await clinet.post(url, headers=headers,json=params,timeout=60)
    #     print(response.text)
    async with AsyncClient() as clinet:
        async with clinet.stream("POST", url, headers=headers, json=params, timeout=60) as response:
            async for line in response.aiter_lines():
                if line.strip() == "":
                    continue
                line = line.replace("data: ","")
                if line.strip() == "[DONE]":
                    return
                data = json.loads(line)
                if data.get("choices") is None or len(data.get("choices")) == 0 or data.get("choices")[0].get("delta").get("finish_reason") is not None:
                    return
                yield data.get("choices")[0]

async def chat(inp: str):
    message = [{"role": "user", "content": inp}]
    chat_msg = defaultdict(str)
    async for i in request(message):
        if i.get("delta").get("role"):
            chat_msg["role"] = i.get("delta").get("role")
        if i.get("delta").get("content"):
            chat_msg["content"] += i.get("delta").get("content")
    print(chat_msg)
if __name__ == '__main__':
    import asyncio
    asyncio.run(chat("你好啊"))
bash 复制代码 
defaultdict(<class 'str'>, {'role': 'assistant', 'content': '你好！有什么我可以帮助你的吗？'}

使用fastapi进行封装

python 复制代码 
import os
import fastapi
import dotenv
from httpx import AsyncClient
from typing import List,Dict
from fastapi import FastAPI, WebSocket
from fastapi.middleware.cors import CORSMiddleware

import json
from collections import defaultdict
from fastapi.responses import HTMLResponse

app = FastAPI()
dotenv.load_dotenv('./env')


# app.add_middleware(
#     CORSMiddleware,
#     allow_origins=["*"],
#     allow_credentials=True,
#     allow_methods=["*"],
#     allow_headers=["*"],
# )


@app.get("/")
async def root():
    return {"message": "Hello World"}

# print(os.getenv('OPENAI_API_BASE'))
async def request(val: List[dict[str,str]]):
    """
    发起请求
    val: 对话内容
    """
    url = "https://xiaoai.plus/v1/chat/completions"
    headers ={
        "Content-Type": "application/json",
        "Authorization": "Bearer " + os.getenv("OPENAI_API_KEY"),

    }
    params = {
        "model": "gpt-3.5-turbo",
        "messages": val, # [{"role": "user", "content": "Say this is a test!"}]
        "temperature": 0.7,
        "n": 1,
        "max_tokens": 3000,
        "stream": True
    }
    # async with AsyncClient() as clinet:
    #     response = await clinet.post(url, headers=headers,json=params,timeout=60)
    #     print(response.text)
    async with AsyncClient() as clinet:
        async with clinet.stream("POST", url, headers=headers, json=params, timeout=60) as response:
            async for line in response.aiter_lines():
                if line.strip() == "":
                    continue
                line = line.replace("data: ","")
                if line.strip() == "[DONE]":
                    return
                data = json.loads(line)
                if data.get("choices") is None or len(data.get("choices")) == 0 or data.get("choices")[0].get("delta").get("finish_reason") is not None:
                    return
                yield data.get("choices")[0]

@app.websocket("/chat")
async def chat(websocket: WebSocket):
    await websocket.accept()
    message = []
    while True:
        data = await websocket.receive_text()
        if data == "quit": 
            await websocket.close()
            break
        message.append({"role": "user", "content": data})
        chat_msg = defaultdict(str)
        async for i in request(message):
            if i.get("delta").get("role"):
                chat_msg["role"] = i.get("delta").get("role")
            if i.get("delta").get("content"):
                chat_msg["content"] += i.get("delta").get("content")
                await websocket.send_text(i.get("delta").get("content"))
        message.append(chat_msg)

if __name__ == '__main__':
    import uvicorn
    uvicorn.run("main:app", host="127.0.0.1",port=8080,reload=True)

使用html界面调用

html 复制代码 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Titile</title>
</head>
<body>
    <p>连接状态: <span id="status">未连接</span></p>
    <p>回复消息: <span id="message"></span></p>
    <p><input id="inp"></p>
    <button type="submit" id="submit">提交</button>
<script>
    let status = document.getElementById("status")
    let message = document.getElementById("message")
    let inp = document.getElementById("inp")
    let submit = document.getElementById("submit")

    let socket = new WebSocket("ws://127.0.0.1:8080/chat")
    socket.addEventListener("open", (event)=>{
        status.innerText = "已连接"
    })
    socket.addEventListener("error", (event)=>{
        status.innerText = "已失败"
    })
    socket.addEventListener("close", (event)=>{
        status.innerText = "已关闭"
        console.log("WebSocket closed:", event)
    })
    socket.addEventListener("message", (event)=>{
        message.innerText += event.data
    })
    submit.addEventListener("click", ()=>{
        socket.send(inp.value)
    })
</script>
</body>
</html>
相关推荐
可乐ea7 小时前
智能体的模型列表为什么要从三处来源合成：一次让 GPT-6.1 Sol 选不上的发布延迟
人工智能·gpt·chatgpt·智能体框架·模型列表·多源数据合成·客户端工程
dozenyaoyida2 天前
AI与大模型新闻日报 | 2026-11-11
人工智能·chatgpt·大模型·新闻
一缕82年的清风2 天前
Claude Code 跑 DeepSeek 还带自动切号？开源 Magpie 彻底把大厂的协议护城河给拆了！
chatgpt·claude·gemini
Spidermanbaout5 天前
Prompt-Engineering实战-2026年11月2日
人工智能·机器学习·ai·chatgpt·ai编程
ServBay5 天前
OpenAI大规模封号？ChatGPT 用户该如何应对
chatgpt·openai·ai编程
长不大的杨瑞杰5 天前
ChatGPT 广告技术栈架构拆解：多轮意图、LLM 工具编排、ANN 召回与拍卖闭环
人工智能·chatgpt·系统架构·推荐系统·广告
LK_075 天前
【FastAPI】基础篇 01｜开始之前：API、HTTP 与 FastAPI 到底是什么
网络协议·http·fastapi
AI砖家6 天前
ChatGPT Images 2.6 正式支持 GIF 生成：一张图片也能动起来，AI 动图创作时代来了！
人工智能·chatgpt
看浪的路人6 天前
第3讲：输出安全——PII 脱敏与有害内容过滤
chatgpt
冯智勇Geo7 天前
看书不如聊书：分享一种新的 AI 阅读方式
chatgpt·ai阅读
热门推荐
01国内可直接用、免费额度/永久免费的大模型API清单（含 SiliconFlow、火山、阿里、智谱、百度、Kimi、DeepSeek、DMXAPI 等）02历年考研数学一、数学二、数学三真题试卷及答案PDF03几个好用的ip纯净度检测网站04微信历史版本含下载地址（ Windows PC | 安卓 | MAC ）及设置微信不更新05如何新建文件夹？ 电脑新建文件夹的4种方法06昇腾910B系列芯片完全指南：四款型号对比、服务器选型与大模型部署实战07GitHub 镜像站点08苹果iPA游戏软件资源下载网站09蜘蛛磁力 搜索引擎大全，如何使用蜘蛛磁力查找磁力链接10【SQL Server 2022】保姆级SQL Server 详细图文下载安装教程