admin
155 строки
4.5 KiB
Python
155 строки
4.5 KiB
Python
"""libvirt 多主机连接管理器"""
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from __future__ import annotations
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import libvirt
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from contextlib import contextmanager
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import logging
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from app.hosts import get_host, update_host_status, list_hosts
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logger = logging.getLogger(__name__)
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class LibvirtConnection:
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"""单个 libvirt 连接管理器（只读保持，读写短连接）"""
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def __init__(self, uri: str, host_id: str = "local"):
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self._uri = uri
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self._host_id = host_id
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self._conn = None
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def _connect(self):
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"""建立只读连接"""
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try:
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conn = libvirt.openReadOnly(self._uri)
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if conn is None:
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raise ConnectionError(f"无法连接到 libvirt: {self._uri}")
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return conn
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except libvirt.libvirtError as e:
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logger.error(f"libvirt 连接错误 ({self._host_id}): {e}")
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raise
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def _connect_rw(self):
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"""建立可读写连接"""
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try:
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conn = libvirt.open(self._uri)
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if conn is None:
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raise ConnectionError(f"无法连接到 libvirt (RW): {self._uri}")
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return conn
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except libvirt.libvirtError as e:
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logger.error(f"libvirt RW 连接错误 ({self._host_id}): {e}")
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raise
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@property
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def conn(self):
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"""获取只读连接（带自动重连）"""
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try:
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if self._conn is None or not self._conn.isAlive():
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self._conn = self._connect()
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except Exception:
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self._conn = self._connect()
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return self._conn
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@contextmanager
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def get_rw(self):
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"""获取读写连接（短连接，用完关闭）"""
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conn = None
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try:
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conn = self._connect_rw()
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yield conn
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finally:
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if conn is not None:
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try:
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conn.close()
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except Exception:
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pass
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def get_host_info(self):
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"""获取宿主机信息"""
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c = self.conn
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return {
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"hostname": c.getHostname(),
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"hypervisor": c.getType(),
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"libvirt_version": c.getLibVersion(),
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"hypervisor_version": c.getVersion(),
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"cpu_model": c.getInfo()[5] if len(c.getInfo()) > 5 else "Unknown",
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"cpu_cores": c.getInfo()[2],
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"memory_total": c.getInfo()[1], # KB
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"cpu_speed": c.getInfo()[3], # MHz
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}
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def close(self):
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"""关闭连接"""
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if self._conn is not None:
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try:
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self._conn.close()
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except Exception:
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pass
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self._conn = None
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class ConnectionPool:
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"""多主机连接池"""
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def __init__(self):
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self._pool: dict[str, LibvirtConnection] = {}
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def get(self, host_id: str = "local") -> LibvirtConnection:
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"""获取指定主机的连接管理器"""
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if host_id not in self._pool:
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host = get_host(host_id)
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if not host:
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raise ValueError(f"主机 '{host_id}' 不存在")
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self._pool[host_id] = LibvirtConnection(host.uri, host_id)
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return self._pool[host_id]
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def remove(self, host_id: str):
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"""移除并关闭指定主机的连接"""
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if host_id in self._pool:
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self._pool[host_id].close()
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del self._pool[host_id]
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def get_conn(self, host_id: str = "local"):
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"""快捷获取 libvirt 只读连接"""
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return self.get(host_id).conn
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@contextmanager
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def get_rw(self, host_id: str = "local"):
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"""快捷获取 libvirt 读写连接"""
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mgr = self.get(host_id)
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with mgr.get_rw() as conn:
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yield conn
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def refresh_all(self):
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"""刷新所有连接状态"""
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for host_id, mgr in list(self._pool.items()):
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try:
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alive = mgr.conn.isAlive()
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update_host_status(host_id, "online" if alive else "offline")
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except Exception:
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update_host_status(host_id, "offline")
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mgr.close()
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# 全局连接池单例
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conn_pool = ConnectionPool()
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# 保持向后兼容：本机连接的直接引用
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libvirt_conn = property(lambda self: conn_pool.get("local"))
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class _CompatConn:
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"""向后兼容包装，让现有 `libvirt_conn.conn` 等调用继续工作"""
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@property
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def conn(self):
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return conn_pool.get_conn("local")
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def get_rw(self):
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return conn_pool.get_rw("local")
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def get_host_info(self):
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return conn_pool.get("local").get_host_info()
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# 全局兼容单例
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libvirt_conn = _CompatConn()
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