目录
- 连接池实现
- 使用连接池
连接池实现
socket_pool.py
-*- coding:utf-8 -*-import socketimport timeimport threadingimport osimport loggingimport tracebackfrom queue import Queue, Empty_logger = logging.getLogger(‘mylogger’)class SocketPool: def __init__(self, host, port, min_connections=10, max_connections=10): ”’ 初始化Socket连接池 :param host: 目标主机地址 :param port: 目标端口号 :param min_connections: 最小连接数 :param max_connections: 最大连接数 ”’ self.host = host self.port = port self.min_connections = min_connections self.max_connections = max_connections self.busy_sockets_dict = } 存放从连接池取出的socket的id self._sock_lock = threading.Lock() 线程锁保证计数正确 self._pool = Queue(max_connections) 基于线程安全的队列存储连接 self._lock = threading.Lock() 线程锁保证资源安全: self._init_pool() 预创建连接 self._start_health_check() 启动连接健壮检查线程 def _init_pool(self): ”’预创建连接并填充到池中”’ for _ in range(self.min_connections): sock = self._create_socket() self._pool.put(sock) def _create_socket(self): ”’创建新的Socket连接”’ sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: sock.connect((self.host, self.port)) return sock except socket.error as e: raise ConnectionError(f’Failed to connect: e}’) 连接失败抛出异常 def _start_health_check(self): ”’启动后台线程定期检查连接有效性”’ def check(): while True: with self._lock: for _ in range(self._pool.qsize()): sock = self._pool.get() self.busy_sockets_dict[sock] = 1 try: sock.send(b’PING<END>’) 发送心跳包验证连接情形 下面内容 11 为服务端返回数据字节长度，不能乱写，否则会导致获取非健壮检查响应报文数据存在多余内容，不符合格式，从而导致数据解析难题 sock.recv(11) self._pool.put(sock) self.busy_sockets_dict.pop(sock) except (socket.error, ConnectionResetError): _logger.error(‘socket连接健壮检查出错：%s, 关闭失效连接并创建新连接替换’ % traceback.format_exc()) sock.close() 关闭失效连接并创建新连接替换 self.busy_sockets_dict.pop(sock) new_sock = self._create_socket() self._pool.put(new_sock) 如果sock数量小于最小数量，则补充 for _ in range(0, self.min_connections – self._pool.qsize()): new_sock = self._create_socket() self._pool.put(new_sock) time.sleep(60) 每60秒检查一次 threading.Thread(target=check, daemon=True).start() def get_connection(self): ”’ 从池中获取一个可用连接 :return: socket对象 ”’ with self._sock_lock: if self._pool.empty(): if len(self.busy_sockets_dict.keys()) < self.max_connections: new_sock = self._create_socket() self.busy_sockets_dict[new_sock] = 1 return new_sock else: raise Empty(‘No available connections in pool’) else: try: sock = self._pool.get(block=False) self.busy_sockets_dict[sock] = 1 return sock except Exception: _logger.error(‘获取socket连接出错：%s’ % traceback.format_exc()) raise def release_connection(self, sock): ”’ 将连接归还到池中 :param sock: 待归还的socket对象 ”’ if not sock._closed: self._pool.put(sock) if sock in self.busy_sockets_dict: self.busy_sockets_dict.pop(sock) def close_all(self): ”’关闭池中所有连接”’ while not self._pool.empty(): sock = self._pool.get() sock.close() self.busy_sockets_dict.pop(sock.id) self.busy_sockets_dict = } 兜底host = os.environ.get(‘MODBUS_TCP_SERVER_HOST’, ‘127.0.0.1’)port = int(os.environ.get(‘MODBUS_TCP_SERVER_PORT’, ‘9000’))min_connections = int(os.environ.get(‘DJANGO_SOCKET_POOL_MAX_CONNECTIONS’, ’10’))max_connections = int(os.environ.get(‘DJANGO_SOCKET_POOL_MAX_CONNECTIONS’, ‘100’))socketPool = SocketPool(host, port, min_connections, max_connections)
使用连接池
from socket_pool import socketPooldef send_socket_msg(data): global socketPool try: sock = None 获取连接（支持超时控制） sock = socketPool.get_connection() 发送数据 sock.sendall(data.encode(‘utf-8’)) except Exception: error_msg = ‘发送消息出错：%s’ % traceback.format_exc() _logger.error(error_msg) if sock is not None: sock.close() socketPool.release_connection(sock) return send_socket_msg(data) response = ” try: while True: chunk = sock.recv(4096) chunk = chunk.decode(‘utf-8’) response += chunk if response.endswith(‘<END>’): response = response.rstrip(‘<END>’) return ‘success’:True, ‘message’:response} except Exception: error_msg = ‘获取消息出错：%s’ % traceback.format_exc() _logger.error(error_msg) return ‘success’:False, ‘message’: error_msg} finally: 必须归还连接！ socketPool.release_connection(sock)
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