我正在构建.Net核心应用程序后端,该后端发布在带有中。在这种情况下,用户可以创建会话并接收消息给它。会话和消息存储在数据库中,但为了使其更快,我使用PubSub工具处理消息,而不是实际对应的REST请求。为了说明清楚,在创建会话时,也会创建对Redis通道的订阅,并将消息发布到该通道,然后处理程序将消息存储在数据库中。
我使用的是经过许可的ServiceStack.Redis版本,在Visual (Kestrel)的开发服务器上一切正常,但是一旦我将它部署到IIS上,大多数情况下都会出现这样的错误:
Unable to Connect: sPort: 0, Error: Object reference not set to an instance of an object.
at ServiceStack.Redis.RedisNativeClient.Connect()
at ServiceStack.Redis.RedisNativeClient.SendReceive[T](Byte[][] cmdWithBinaryArgs, Func`1 fn, Action`1 completePipelineFn, Boolean sendWithoutRead)这有点随机,因为也许可以订阅几个频道,然后又开始失败一段时间,或者从一开始就失败了。服务器的防火墙是禁用的,Redis已经通过msi安装程序安装为一个服务,具有默认配置,并且redis-cli工作正常。事实上,我可以从redis-cli订阅一个频道,并通过后端向该频道发送消息,没有任何问题。
正如这个问题的答案所建议的那样,我试图为Redis客户端添加更大的超时,但仍然失败。
这是代码,如果有帮助的话:
private void CreateRedisSubscription(string channelName)
{
_log.LogInformation("Creating subscription to channel " + channelName);
using (RedisClient redisClient = new RedisClient(Globals.REDIS_HOST, Globals.REDIS_PORT)){
// Too big timeout to make sure the error it's not because of a timeout.
redisClient.ConnectTimeout = 30000;
using (subscription = redisClient.CreateSubscription())
{
subscription.OnSubscribe = channel =>
{
Console.Write("Subscribed to channel: " + channel);
};
subscription.OnUnSubscribe = channel =>
{
Console.Write("Unsubscribed from channel: " + channel);
ThreadsMember threadMember = subscriptionThreads.Find(t => t.ThreadName.Equals(channel));
if(threadMember != null)
{
threadMember.subscriptionThread.Abort();
subscriptionThreads.Remove(threadMember);
}
};
subscription.OnMessage += (channel, message) => ProcessMessage(channel, message);
Thread thread = new Thread(() =>
{
try{
subscription.SubscribeToChannels(channelName);
_log.LogInformation("Subscribed to channel " + channelName);
}catch (Exception e)
{
Console.WriteLine(e.Message);
_log.LogWarning("Can not subscribe to channel " + channelName);
_log.LogError(e.Message);
_log.LogTrace(e.StackTrace);
if(e.InnerException != null)
_log.LogError(e.InnerException.Message);
}
});
thread.IsBackground = true;
//Add the thread to a list for future management (unsubscribe from that channel)
subscriptionThreads.Add(new ThreadsMember(channelName, thread));
thread.Start();
}
}
}提前谢谢。
发布于 2018-09-13 09:16:14
应该避免使用Thread.Abort(),因为它会使中止的实例处于不一致的状态。
我建议使用ServiceStack.Redis托管订阅,它负责管理订阅,并允许您实现回调以处理不同的订阅事件:
var clientsManager = new PooledRedisClientManager();
var redisPubSub = new RedisPubSubServer(clientsManager, "channel-1", "channel-2") {
OnMessage = (channel, msg) => "Received '{0}' from '{1}'".Print(msg, channel)
}.Start();https://stackoverflow.com/questions/52310273
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