fix dead lock.

src/DotNetCore.CAP.Kafka/PublishQueueExecutor.cs

@@ -21,7 +21,7 @@ namespace DotNetCore.CAP.Kafka
             _kafkaOptions = options;
         }
 
-        public override async Task<OperateResult> PublishAsync(string keyName, string content)
+        public override Task<OperateResult> PublishAsync(string keyName, string content)
         {
             try
             {
@@ -29,21 +29,21 @@ namespace DotNetCore.CAP.Kafka
                 var contentBytes = Encoding.UTF8.GetBytes(content);
                 using (var producer = new Producer(config))
                 {
-                    var message = await producer.ProduceAsync(keyName, null, contentBytes);
+                    var message = producer.ProduceAsync(keyName, null, contentBytes).Result;
 
                     if (!message.Error.HasError)
                     {
                         _logger.LogDebug($"kafka topic message [{keyName}] has been published.");
 
-                        return OperateResult.Success;
+                        return Task.FromResult(OperateResult.Success);
                     }
                     else
                     {
-                        return OperateResult.Failed(new OperateError
+                        return Task.FromResult(OperateResult.Failed(new OperateError
                         {
                             Code = message.Error.Code.ToString(),
                             Description = message.Error.Reason
-                        });
+                        }));
                     }
                 }
             }
@@ -51,7 +51,7 @@ namespace DotNetCore.CAP.Kafka
             {
                 _logger.LogError($"kafka topic message [{keyName}] has benn raised an exception of sending. the exception is: {ex.Message}");
 
-                return OperateResult.Failed(ex);
+                return Task.FromResult(OperateResult.Failed(ex));
             }
         }
     }