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89 lines
2.6 KiB
89 lines
2.6 KiB
from contextlib import asynccontextmanager
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from fastapi import FastAPI, HTTPException
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from pydantic import BaseModel
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from kafka import KafkaProducer, KafkaAdminClient
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from kafka.admin import NewTopic
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import uuid
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import json
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from AiService.Model.TaskModel import *
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# 定义请求体模型
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class TaskRequest(BaseModel):
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prompt: str # 用户输入的提示词
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# 初始化 FastAPI 应用
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app = FastAPI()
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# 创建 Kafka 生产者
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producer = KafkaProducer(
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bootstrap_servers=KAFKA_BOOTSTRAP_SERVERS,
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value_serializer=lambda v: json.dumps(v).encode('utf-8') # 将消息序列化为 JSON
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)
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# 检查并创建主题
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def ensure_topic_exists():
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try:
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# 创建 Kafka AdminClient
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admin_client = KafkaAdminClient(bootstrap_servers=KAFKA_BOOTSTRAP_SERVERS)
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# 获取所有主题
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existing_topics = admin_client.list_topics()
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# 如果主题不存在，则创建
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if KAFKA_TOPIC not in existing_topics:
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topic = NewTopic(
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name=KAFKA_TOPIC,
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num_partitions=1, # 分区数
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replication_factor=1 # 副本数
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)
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admin_client.create_topics([topic])
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print(f"Topic '{KAFKA_TOPIC}' created successfully.")
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else:
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print(f"Topic '{KAFKA_TOPIC}' already exists.")
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# 关闭 AdminClient
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admin_client.close()
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except Exception as e:
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print(f"Failed to ensure topic exists: {str(e)}")
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# 定义 Lifespan 事件
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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# 应用启动时检查并创建主题
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ensure_topic_exists()
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yield
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# 应用关闭时清理资源（可选）
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print("Application shutdown.")
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# 定义接口
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@app.post("/create-task")
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def create_task(task_request: TaskRequest):
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try:
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# 生成唯一的 task_id
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task_id = str(uuid.uuid4())
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# 构造任务信息
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task_data = {
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"task_id": task_id,
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"prompt": task_request.prompt
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}
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# 将任务信息写入 Kafka
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producer.send(KAFKA_TOPIC, value=task_data)
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producer.flush() # 确保消息发送完成
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# 将任务信息写入 MySQL
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tm = TaskModel()
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tm.insert_task(task_id, task_request.prompt)
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tm.close()
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# 返回 task_id
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return {"task_id": task_id}
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except Exception as e:
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# 处理异常
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raise HTTPException(status_code=500, detail=f"Failed to create task: {str(e)}")
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# 启动应用
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="0.0.0.0", port=8000) |