feat: demo

demo_a2a_protocol/a2a_server.py

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+from python_a2a import A2AServer, run_server, AgentCard, AgentSkill, TaskStatus, TaskState
+
+# 定义代理卡片
+ticket_card = AgentCard(
+    name="TicketAgentServer",
+    description="票务代理",
+    url="http://127.0.0.1:5010",
+    skills=[AgentSkill(name="book_ticket", description="预订票务")]
+)
+
+# 自定义 A2AServer 子类
+class TicketServer(A2AServer):
+    def __init__(self):
+        super().__init__(agent_card=ticket_card)
+
+    def handle_task(self, task):
+        print("收到A2A任务的task:=>", task)
+        #默认写法：获取任务内容
+        query = (task.message or {}).get("content", {}).get("text", "")
+
+        if "上海" in query and "北京" in query:
+        # 这里的结果可以来自于 MCP 模块，这里我们直接模拟结果
+            train_result = "上海到北京的火车票已经预订成功！  G1001,10车1A "
+        else:
+            train_result = "请输入明确的出发地和目的地。"
+
+        task.artifacts = [{"parts": [{"type": "text", "text": train_result}]}]
+        task.status = TaskStatus(state=TaskState.COMPLETED)
+        print(f"[{self.agent_card.name} 日志] 任务处理完毕")
+        print(f"[{self.agent_card.name} 日志] 输出结果task: {task}")
+        print(f"[{self.agent_card.name} 日志] 输出结果task.artifacts: {task.artifacts}")
+        return task
+
+# 启动服务器
+if __name__ == "__main__":
+    server = TicketServer()
+    print(f"[{server.agent_card.name}] 启动成功，服务地址: {server.agent_card.url}")
+    run_server(server, host="127.0.0.1", port=5010, debug=True)