com.rabbitmq.client.AlreadyClosedException: connection is already closed due to connection error;

本文介绍在使用RabbitMQ客户端过程中遇到的网络切换导致的连接关闭异常,并提供两种解决方案,一是修改关闭通道的方式,二是忽略异常。

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问题重现:

使用RabbitClient时候切换网络,由wifi切换到流量模式的时候,出现如下异常。

com.rabbitmq.client.AlreadyClosedException: connection is already closed due to connection error; cause: java.net.SocketException: Software caused connection abort
                                                                          at com.rabbitmq.client.impl.AMQChannel.processShutdownSignal(AMQChannel.java:283)
                                                                          at com.rabbitmq.client.impl.ChannelN.startProcessShutdownSignal(ChannelN.java:267)
                                                                          at com.rabbitmq.client.impl.ChannelN.close(ChannelN.java:573)
                                                                          at com.rabbitmq.client.impl.ChannelN.close(ChannelN.java:509)
                                                                          at com.rabbitmq.client.impl.ChannelN.close(ChannelN.java:503)
                                                                          at edu.hrbeu.ice.mobilecar.activity.MapActivity$2$override.run(MapActivity.java:310)
                                                                          at edu.hrbeu.ice.mobilecar.activity.MapActivity$2$override.access$dispatch(MapActivity.java)
                                                                          at edu.hrbeu.ice.mobilecar.activity.MapActivity$2.run(MapActivity.java:0)
                                                                          at java.lang.Thread.run(Thread.java:761)

异常定位:在重message池中取数据的时候捕获异常。

try {
    if (channel != null)
        channel.close();
    if (connection != null)
        connection.close();
} catch (IOException e) {
    e.printStackTrace();
} catch (TimeoutException e) {
    e.printStackTrace();
}
问题解决:

方法1:

将以上代码改为

 try {

                            if (channel != null) {
                                channel.abort();
                            }
                            if (connection != null) {
                                connection.close();
                            }
                        } catch (IOException e) {
                            e.printStackTrace();
                        }catch (AlreadyClosedException e){
                            e.printStackTrace();
                        }
方法2:将以上代码删除 不去捕获异常,不做操作。

<think>我们遇到了一个错误:"发送音频数据到ASR失败:socket isalready closed"。这意味着我们尝试通过WebSocket发送音频数据时,WebSocket连接已经关闭。可能的原因:1. WebSocket连接在发送之前已经被关闭(可能是由于服务器关闭、网络问题、心跳超时等)。2.在发送音频数据之前,连接已经因为错误而断开。解决方案:1.在发送数据之前检查WebSocket连接状态。2.实现重连机制,当连接断开时尝试重新连接。3.在发送数据时捕获异常,并处理连接关闭的情况。以下是一个改进的WebSocket客户端实现,包括状态检查和重连机制:</think>### 解决 "socket is already closed" 错误 当尝试发送音频数据到 ASR 服务时出现 "socket is already closed" 错误,这表明 WebSocket 连接在发送数据前已被关闭。以下是完整的解决方案: #### 错误原因分析 1. **连接过早关闭**: - 服务器主动关闭连接 - 心跳机制失败导致超时断开 - 网络中断或服务器重启 2. **并发访问问题**: - 多个线程同时操作同一个连接 - 发送数据时连接已被其他线程关闭 3. **资源管理不当**: - 未正确处理连接生命周期 - 未捕获和处理连接异常 #### 完整解决方案代码 ```python import asyncio import websockets import threading import queue import time import logging # 配置日志 logging.basicConfig(level=logging.INFO) logger = logging.getLogger("ASRClient") class ASRClient: def __init__(self, uri, audio_queue, reconnect_interval=5, max_reconnects=10): self.uri = uri self.audio_queue = audio_queue self.reconnect_interval = reconnect_interval self.max_reconnects = max_reconnects self.reconnect_count = 0 self.connection = None self.running = False self.lock = threading.Lock() # 线程安全锁 self.last_activity = time.time() async def connect(self): """建立WebSocket连接""" try: logger.info(f"尝试连接到: {self.uri}") # 添加自定义超时和重试参数 self.connection = await websockets.connect( self.uri, ping_interval=30, ping_timeout=10, close_timeout=5, max_queue=1024, open_timeout=15 ) logger.info(f"成功连接到ASR服务") self.reconnect_count = 0 # 重置重连计数器 self.last_activity = time.time() return True except Exception as e: logger.error(f"连接失败: {str(e)}") return False async def send_audio(self, audio_data): """发送音频数据到ASR服务""" with self.lock: # 确保线程安全 if not self.connection or self.connection.closed: logger.warning("连接已关闭,无法发送数据") return False try: # 检查连接是否活跃 if time.time() - self.last_activity > 30: await self.connection.ping() await self.connection.send(audio_data) self.last_activity = time.time() logger.debug(f"成功发送 {len(audio_data)} 字节音频数据") return True except websockets.exceptions.ConnectionClosed as e: logger.error(f"发送失败: 连接已关闭 ({e.code})") return False except Exception as e: logger.error(f"发送失败: {str(e)}") return False async def receive_results(self): """接收ASR识别结果""" try: while self.running and self.connection and not self.connection.closed: result = await self.connection.recv() self.last_activity = time.time() logger.info(f"收到ASR结果: {result}") # 处理识别结果... except Exception as e: logger.error(f"接收结果失败: {str(e)}") async def maintain_connection(self): """维护连接状态""" self.running = True while self.running and self.reconnect_count < self.max_reconnects: # 连接或重连 if not self.connection or self.connection.closed: if not await self.connect(): self.reconnect_count += 1 logger.warning(f"将在 {self.reconnect_interval} 秒后重试...") await asyncio.sleep(self.reconnect_interval) continue # 处理音频数据 try: while not self.audio_queue.empty(): audio_data = self.audio_queue.get_nowait() if not await self.send_audio(audio_data): break # 发送失败,退出循环尝试重连 except queue.Empty: await asyncio.sleep(0.1) if self.reconnect_count >= self.max_reconnects: logger.error("达到最大重连次数,停止尝试") def start(self): """启动客户端""" loop = asyncio.new_event_loop() asyncio.set_event_loop(loop) loop.run_until_complete(self.maintain_connection()) def stop(self): """停止客户端""" self.running = False if self.connection and not self.connection.closed: asyncio.get_event_loop().run_until_complete(self.connection.close()) # 使用示例 if __name__ == "__main__": # 配置参数 asr_uri = "ws://your-asr-server:port/path" audio_queue = queue.Queue() # 创建客户端 client = ASRClient(asr_uri, audio_queue) # 启动客户端线程 client_thread = threading.Thread(target=client.start) client_thread.daemon = True client_thread.start() try: # 模拟添加音频数据 for i in range(10): # 实际应用中从麦克风或文件获取音频数据 audio_data = b"fake_audio_data_chunk_" + str(i).encode() audio_queue.put(audio_data) time.sleep(0.5) # 保持主线程运行 while client_thread.is_alive(): time.sleep(1) except KeyboardInterrupt: logger.info("停止客户端...") client.stop() client_thread.join() ``` #### 关键改进说明 1. **连接状态管理**: - 使用 `connection.closed` 属性检查连接状态 - 添加线程安全锁 (`self.lock`) 防止并发访问冲突 - 记录最后活动时间用于心跳检测 2. **自动重连机制**: ```python while self.running and self.reconnect_count < self.max_reconnects: if not self.connection or self.connection.closed: if not await self.connect(): self.reconnect_count += 1 await asyncio.sleep(self.reconnect_interval) ``` 3. **健壮的错误处理**: ```python except websockets.exceptions.ConnectionClosed as e: logger.error(f"发送失败: 连接已关闭 ({e.code})") return False except Exception as e: logger.error(f"发送失败: {str(e)}") return False ``` 4. **资源清理**: ```python def stop(self): self.running = False if self.connection and not self.connection.closed: asyncio.get_event_loop().run_until_complete(self.connection.close()) ``` #### 备选方案:HTTP 回退机制 当 WebSocket 持续失败时,可切换到 HTTP 协议: ```python async def send_audio_fallback(self, audio_data): """WebSocket失败时使用HTTP发送""" try: import requests response = requests.post( self.uri.replace("ws://", "http://").replace("wss://", "https://"), data=audio_data, headers={'Content-Type': 'audio/wav'}, timeout=10 ) if response.status_code == 200: logger.info(f"HTTP回退成功: {response.text}") return True except Exception as e: logger.error(f"HTTP回退失败: {str(e)}") return False ``` #### 最佳实践建议 1. **添加连接监控**: ```python def connection_status(self): if not self.connection: return "DISCONNECTED" elif self.connection.closed: return "CLOSED" else: return "CONNECTED" ``` 2. **实现指数退避重连**: ```python reconnect_delay = min(2 ** self.reconnect_count, 60) # 最大60秒 await asyncio.sleep(reconnect_delay) ``` 3. **添加流量控制**: ```python if self.audio_queue.qsize() > 100: # 防止队列积压 logger.warning("音频队列积压,丢弃旧数据") while self.audio_queue.qsize() > 50: self.audio_queue.get() ```
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