feat: KVM虚拟化管理平台初始版本

backend/app/routers/network.py

@@ -0,0 +1,175 @@
+"""网络管理路由"""
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel, Field
+from typing import Optional, List
+from lxml import etree
+
+from app.libvirt_conn import libvirt_conn
+import libvirt
+
+router = APIRouter()
+
+
+class NetworkCreate(BaseModel):
+    name: str = Field(..., description="网络名称")
+    mode: str = Field("nat", description="模式: nat/bridge/isolated")
+    subnet: str = Field("192.168.100.0/24", description="子网")
+    bridge: Optional[str] = Field(None, description="桥接网卡名(mode=bridge时必填)")
+    dhcp_start: Optional[str] = Field(None, description="DHCP起始IP")
+    dhcp_end: Optional[str] = Field(None, description="DHCP结束IP")
+
+
+@router.get("/list")
+async def list_networks():
+    """列出所有网络"""
+    conn = libvirt_conn.conn
+    networks = conn.listAllNetworks(0)
+    result = []
+    for net in networks:
+        xml = etree.fromstring(net.XMLDesc(0).encode())
+
+        # 解析网络信息
+        forward = xml.find("forward")
+        mode = forward.get("mode", "isolated") if forward is not None else "isolated"
+
+        ip_elem = xml.find("ip")
+        address = ip_elem.get("address", "") if ip_elem is not None else ""
+        netmask = ip_elem.get("netmask", "") if ip_elem is not None else ""
+
+        bridge = xml.find("bridge")
+        bridge_name = bridge.get("name", "") if bridge is not None else ""
+
+        # DHCP范围
+        dhcp_range = None
+        dhcp = xml.find(".//dhcp")
+        if dhcp is not None:
+            r = dhcp.find("range")
+            if r is not None:
+                dhcp_range = {
+                    "start": r.get("start", ""),
+                    "end": r.get("end", ""),
+                }
+
+        # 活跃租约
+        leases = []
+        try:
+            for lease in net.DHCPLeases():
+                leases.append({
+                    "ip": lease.get("ipaddr", ""),
+                    "mac": lease.get("mac", ""),
+                    "hostname": lease.get("hostname", ""),
+                    "expiry": lease.get("expirytime", 0),
+                })
+        except Exception:
+            pass
+
+        result.append({
+            "name": net.name(),
+            "active": net.isActive() == 1,
+            "persistent": net.isPersistent() == 1,
+            "autostart": net.autostart() == 1,
+            "mode": mode,
+            "address": address,
+            "netmask": netmask,
+            "bridge": bridge_name,
+            "dhcp": dhcp_range,
+            "leases": leases,
+        })
+    return {"networks": result, "total": len(result)}
+
+
+@router.get("/detail/{name}")
+async def get_network(name: str):
+    """获取网络详情"""
+    conn = libvirt_conn.conn
+    try:
+        net = conn.networkLookupByName(name)
+    except libvirt.libvirtError:
+        raise HTTPException(status_code=404, detail=f"网络 '{name}' 不存在")
+
+    xml_str = net.XMLDesc(0)
+    return {"name": name, "xml": xml_str, "active": net.isActive() == 1}
+
+
+@router.post("/create")
+async def create_network(net: NetworkCreate):
+    """创建网络"""
+    if net.mode == "bridge" and not net.bridge:
+        raise HTTPException(status_code=400, detail="桥接模式必须指定桥接网卡")
+
+    if net.mode == "bridge":
+        xml = f"""<network>
+  <name>{net.name}</name>
+  <forward mode='bridge'/>
+  <bridge name='{net.bridge}'/>
+</network>"""
+    else:
+        # NAT或隔离模式
+        import ipaddress
+        network = ipaddress.ip_network(net.subnet, strict=False)
+        gateway = str(network.network_address + 1)
+
+        dhcp_xml = ""
+        if net.mode == "nat":
+            start = net.dhcp_start or str(network.network_address + 2)
+            end = net.dhcp_end or str(network.network_address + 254)
+            dhcp_xml = f"""
+    <dhcp>
+      <range start='{start}' end='{end}'/>
+    </dhcp>"""
+
+        forward_xml = f"<forward mode='{net.mode}'/>" if net.mode == "nat" else ""
+        netmask = str(network.netmask)
+
+        xml = f"""<network>
+  <name>{net.name}</name>
+  {forward_xml}
+  <bridge name='virbr-{net.name[:8]}' stp='on' delay='0'/>
+  <ip address='{gateway}' netmask='{netmask}'>{dhcp_xml}
+  </ip>
+</network>"""
+
+    with libvirt_conn.get_rw() as rw_conn:
+        try:
+            n = rw_conn.networkDefineXML(xml)
+            n.setAutostart(1)
+            n.create()
+            return {"message": f"网络 '{net.name}' 创建成功"}
+        except libvirt.libvirtError as e:
+            raise HTTPException(status_code=500, detail=f"创建网络失败: {str(e)}")
+
+
+@router.delete("/delete/{name}")
+async def delete_network(name: str):
+    """删除网络"""
+    with libvirt_conn.get_rw() as rw_conn:
+        try:
+            net = rw_conn.networkLookupByName(name)
+        except libvirt.libvirtError:
+            raise HTTPException(status_code=404, detail=f"网络 '{name}' 不存在")
+
+        if net.isActive():
+            net.destroy()
+        net.undefine()
+        return {"message": f"网络 '{name}' 已删除"}
+
+
+@router.post("/action/{name}")
+async def network_action(name: str, action: str):
+    """网络操作: start/stop"""
+    with libvirt_conn.get_rw() as rw_conn:
+        try:
+            net = rw_conn.networkLookupByName(name)
+        except libvirt.libvirtError:
+            raise HTTPException(status_code=404, detail=f"网络 '{name}' 不存在")
+
+        try:
+            if action == "start":
+                net.create()
+            elif action == "stop":
+                net.destroy()
+            else:
+                raise HTTPException(status_code=400, detail=f"不支持的操作: {action}")
+            return {"message": f"网络 '{name}' {action} 成功"}
+        except libvirt.libvirtError as e:
+            raise HTTPException(status_code=500, detail=f"操作失败: {str(e)}")