Merge branch 'master' of git@github.com:StackExchange/StackExchange.Redis.git

StackExchange.Redis/StackExchange/Redis/ConnectionMultiplexer.cs

@@ -662,7 +662,7 @@ public static async Task<ConnectionMultiplexer> ConnectAsync(string configuratio
                 bool configured = await muxer.ReconfigureAsync(true, false, log, null, "connect").ObserveErrors().ForAwait();
                 if (!configured)
                 {
-                    throw ExceptionFactory.UnableToConnect();
+                    throw ExceptionFactory.UnableToConnect(muxer.failureMessage);
                 }
                 killMe = null;
                 return muxer;
@@ -685,7 +685,7 @@ public static async Task<ConnectionMultiplexer> ConnectAsync(ConfigurationOption
                 bool configured = await muxer.ReconfigureAsync(true, false, log, null, "connect").ObserveErrors().ForAwait();
                 if (!configured)
                 {
-                    throw ExceptionFactory.UnableToConnect();
+                    throw ExceptionFactory.UnableToConnect(muxer.failureMessage);
                 }
                 killMe = null;
                 return muxer;
@@ -733,7 +733,7 @@ public static ConnectionMultiplexer Connect(string configuration, TextWriter log
                         throw new TimeoutException();
                     }
                 }
-                if(!task.Result) throw ExceptionFactory.UnableToConnect();
+                if(!task.Result) throw ExceptionFactory.UnableToConnect(muxer.failureMessage);
                 killMe = null;
                 return muxer;
             }
@@ -762,7 +762,7 @@ public static ConnectionMultiplexer Connect(ConfigurationOptions configuration,
                         throw new TimeoutException();
                     }
                 }
-                if(!task.Result) throw ExceptionFactory.UnableToConnect();
+                if (!task.Result) throw ExceptionFactory.UnableToConnect(muxer.failureMessage);
                 killMe = null;
                 return muxer;
             }
@@ -772,6 +772,7 @@ public static ConnectionMultiplexer Connect(ConfigurationOptions configuration,
             }
         }
 
+        private string failureMessage;
         private readonly Hashtable servers = new Hashtable();
         private volatile ServerEndPoint[] serverSnapshot = NilServers;
 
@@ -1183,6 +1184,7 @@ internal async Task<bool> ReconfigureAsync(bool first, bool reconfigureAll, Text
                             foreach (var ex in aex.InnerExceptions)
                             {
                                 LogLocked(log, "{0} faulted: {1}", Format.ToString(endpoints[i]), ex.Message);
+                                failureMessage = ex.Message;
                             }
                         }
                         else if (task.IsCanceled)

StackExchange.Redis/StackExchange/Redis/ExceptionFactory.cs

@@ -106,10 +106,10 @@ static string GetLabel(bool includeDetail, RedisCommand command, Message message
             return message == null ? command.ToString() : (includeDetail ? message.CommandAndKey : message.Command.ToString());
         }
 
-        internal static Exception UnableToConnect()
+        internal static Exception UnableToConnect(string failureMessage=null)
         {
             return new RedisConnectionException(ConnectionFailureType.UnableToConnect,
-                "It was not possible to connect to the redis server(s); to create a disconnected multiplexer, disable AbortOnConnectFail");
+                "It was not possible to connect to the redis server(s); to create a disconnected multiplexer, disable AbortOnConnectFail. " + failureMessage);
         }
     }
 }

StackExchange.Redis/StackExchange/Redis/RedisValue.cs

@@ -60,6 +60,17 @@ public bool IsNullOrEmpty
             }
         }
 
+        /// <summary>
+        /// Indicates whether the value is greater than zero-length
+        /// </summary>
+        public bool HasValue
+        {
+            get
+            {
+                return valueBlob != null && valueBlob.Length > 0;
+            }
+        }
+
         /// <summary>
         /// Indicates whether two RedisValue values are equivalent
         /// </summary>