重构：通讯录子图支持 async 和 API 注入工厂模式

backend/app/agent_subgraphs/contact/graph.py

@@ -1,11 +1,31 @@
 """
 通讯录子图构建器
 Contact Subgraph Builder
+支持 API 注入的工厂模式
 """
 
 from langgraph.graph import StateGraph, START, END
 
 from .state import ContactState
+from .nodes import create_contact_nodes
+
+
+def build_contact_subgraph(contact_api=None):
+    """
+    构建通讯录子图（工厂模式）
+    
+    Args:
+        contact_api: 可选的 ContactAPIClient 实例（支持真实数据库或模拟模式）
+                     不传入则使用默认模拟 API（向后兼容）
+    
+    Returns:
+        配置好的 StateGraph
+    """
+    # 创建节点（传入 API）
+    nodes = create_contact_nodes(contact_api) if contact_api else None
+    
+    # 如果没有传入 API，使用向后兼容的导入
+    if nodes is None:
         from .nodes import (
             parse_intent,
             list_contacts,
@@ -18,15 +38,18 @@ from .nodes import (
             format_result,
             should_continue
         )
+    else:
+        parse_intent = nodes["parse_intent"]
+        list_contacts = nodes["list_contacts"]
+        add_contact = nodes["add_contact"]
+        list_emails = nodes["list_emails"]
+        generate_email_draft = nodes["generate_email_draft"]
+        human_review = nodes["human_review"]
+        send_email = nodes["send_email"]
+        sniff_contacts = nodes["sniff_contacts"]
+        format_result = nodes["format_result"]
+        should_continue = nodes["should_continue"]
     
-
-def build_contact_subgraph() -> StateGraph:
-    """
-    构建通讯录子图
-    
-    Returns:
-        配置好的 StateGraph
-    """
     # 创建图
     graph = StateGraph(ContactState)
     

backend/app/agent_subgraphs/contact/nodes.py

@@ -1,6 +1,7 @@
 """
 通讯录子图节点 - 使用公共工具版本
 Contact Subgraph Nodes - Using Common Tools
+支持 async 和 API 注入
 """
 
 from typing import Dict, Any
@@ -10,14 +11,25 @@ from datetime import datetime
 from ..common import MarkdownFormatter
 
 from .state import ContactState, ContactAction, Contact, Email
-from .api_client import contact_api
+from .api_client import ContactAPIClient
 
 
-# 模拟联系人数据库（临时存储）
+# 模拟联系人数据库（临时存储，保留作为备选）
 CONTACT_DB = {}
 
 
-def parse_intent(state: ContactState) -> ContactState:
+def create_contact_nodes(contact_api: ContactAPIClient):
+    """
+    创建通讯录子图节点工厂函数
+    
+    Args:
+        contact_api: 已初始化的 ContactAPIClient（支持真实数据库或模拟模式）
+    
+    Returns:
+        节点函数字典
+    """
+    
+    async def parse_intent(state: ContactState) -> ContactState:
         """
         解析用户意图节点
         """
@@ -37,21 +49,19 @@ def parse_intent(state: ContactState) -> ContactState:
         
         return state
     
-
-def list_contacts(state: ContactState) -> ContactState:
+    async def list_contacts(state: ContactState) -> ContactState:
         """
         列出联系人节点
         """
         state.current_phase = "executing"
         
-    # 使用 API 客户端
-    contacts = contact_api.list_contacts(state.user_id)
+        # 使用 API 客户端（async）
+        contacts = await contact_api.list_contacts(state.user_id)
         state.contacts = contacts
         
         return state
     
-
-def add_contact(state: ContactState) -> ContactState:
+    async def add_contact(state: ContactState) -> ContactState:
         """
         添加联系人节点
         """
@@ -59,59 +69,57 @@ def add_contact(state: ContactState) -> ContactState:
         
         # 使用 API 客户端（简化添加，实际项目应解析用户输入）
         new_contact = Contact(
-        id=len(CONTACT_DB) + 1,
+            id=str(len(CONTACT_DB) + 1),
             name="新联系人",
             email="new@example.com",
             phone="13800000000",
-        created_at=datetime.now()
+            created_at=datetime.now().isoformat()
         )
+        # 保存到数据库
+        await contact_api.add_contact(state.user_id, new_contact)
         state.current_contact = new_contact
         
         return state
     
-
-def list_emails(state: ContactState) -> ContactState:
+    async def list_emails(state: ContactState) -> ContactState:
         """
         列出邮件节点
         """
         state.current_phase = "executing"
         
-    # 使用 API 客户端
-    emails = contact_api.list_emails(state.user_id)
+        # 使用 API 客户端（async）
+        emails = await contact_api.list_emails(state.user_id)
         state.emails = emails
         
         return state
     
-
-def generate_email_draft(state: ContactState) -> ContactState:
+    async def generate_email_draft(state: ContactState) -> ContactState:
         """
         生成邮件草稿节点
         """
         state.current_phase = "executing"
         
-    # 使用 API 客户端
-    draft = contact_api.generate_email_draft(state.user_query)
+        # 使用 API 客户端（async）
+        draft = await contact_api.generate_email_draft(state.user_query)
         state.draft_recipient = draft.get("recipient", "recipient@example.com")
         state.draft_subject = draft.get("subject", "邮件主题")
         state.draft_body = draft.get("body", "邮件正文")
         
         return state
     
-
-def sniff_contacts(state: ContactState) -> ContactState:
+    async def sniff_contacts(state: ContactState) -> ContactState:
         """
         嗅探联系人节点
         """
         state.current_phase = "executing"
         
-    # 使用 API 客户端
-    contacts = contact_api.sniff_contacts(state.user_query)
+        # 使用 API 客户端（async）
+        contacts = await contact_api.sniff_contacts(state.user_query)
         state.sniffed_contacts = contacts
         
         return state
     
-
-def format_result(state: ContactState) -> ContactState:
+    async def format_result(state: ContactState) -> ContactState:
         """
         格式化结果节点（使用公共工具）
         """
@@ -137,10 +145,20 @@ def format_result(state: ContactState) -> ContactState:
         elif state.action == ContactAction.EMAIL_LIST and state.emails:
             output_lines.append(md.heading("📬 邮件列表", 2))
             output_lines.append("")
-        email_data = [
-            {"发件人": e.sender, "主题": e.subject, "时间": e.received_at.strftime('%Y-%m-%d %H:%M')}
-            for e in state.emails
-        ]
+            # 兼容两种 date 格式
+            email_data = []
+            for e in state.emails:
+                date_str = e.date
+                if hasattr(e, 'received_at') and e.received_at:
+                    try:
+                        date_str = e.received_at.strftime('%Y-%m-%d %H:%M')
+                    except:
+                        pass
+                email_data.append({
+                    "发件人": e.sender,
+                    "主题": e.subject,
+                    "时间": date_str
+                })
             output_lines.append(md.table(email_data))
         
         elif state.action == ContactAction.EMAIL_SEND and state.draft_subject:
@@ -175,8 +193,7 @@ def format_result(state: ContactState) -> ContactState:
         
         return state
     
-
-def human_review(state: ContactState) -> ContactState:
+    async def human_review(state: ContactState) -> ContactState:
         """
         人工审核节点（用于邮件草稿）
         """
@@ -185,14 +202,13 @@ def human_review(state: ContactState) -> ContactState:
         state.needs_approval = True
         return state
     
-
-def send_email(state: ContactState) -> ContactState:
+    async def send_email(state: ContactState) -> ContactState:
         """
         发送邮件节点
         """
         state.current_phase = "executing"
-    # 使用 API 客户端发送邮件
-    success = contact_api.send_email(
+        # 使用 API 客户端发送邮件（async）
+        success = await contact_api.send_email(
             state.user_id,
             state.draft_recipient,
             state.draft_subject,
@@ -201,7 +217,6 @@ def send_email(state: ContactState) -> ContactState:
         state.success = success
         return state
     
-
     def should_continue(state: ContactState) -> str:
         """
         条件路由函数：根据 action 和状态决定下一个节点
@@ -228,3 +243,36 @@ def should_continue(state: ContactState) -> str:
             return "sniff_contacts"
         else:
             return "format_result"
+    
+    # 返回节点字典
+    return {
+        "parse_intent": parse_intent,
+        "list_contacts": list_contacts,
+        "add_contact": add_contact,
+        "list_emails": list_emails,
+        "generate_email_draft": generate_email_draft,
+        "sniff_contacts": sniff_contacts,
+        "format_result": format_result,
+        "human_review": human_review,
+        "send_email": send_email,
+        "should_continue": should_continue
+    }
+
+
+# ========== 向后兼容的全局版本（使用模拟 API） ==========
+from .api_client import contact_api as _default_contact_api
+
+# 创建默认节点（用模拟 API，保持向后兼容）
+_default_nodes = create_contact_nodes(_default_contact_api)
+
+# 导出默认节点
+parse_intent = _default_nodes["parse_intent"]
+list_contacts = _default_nodes["list_contacts"]
+add_contact = _default_nodes["add_contact"]
+list_emails = _default_nodes["list_emails"]
+generate_email_draft = _default_nodes["generate_email_draft"]
+sniff_contacts = _default_nodes["sniff_contacts"]
+format_result = _default_nodes["format_result"]
+human_review = _default_nodes["human_review"]
+send_email = _default_nodes["send_email"]
+should_continue = _default_nodes["should_continue"]