private bool WriteMessageToServer(PhysicalConnection connection, Message message)
{
if (message == null)
{
return(true);
}
try
{
var cmd = message.Command;
bool isMasterOnly = message.IsMasterOnly();
if (isMasterOnly && ServerEndPoint.IsSlave && (ServerEndPoint.SlaveReadOnly || !ServerEndPoint.AllowSlaveWrites))
{
throw ExceptionFactory.MasterOnly(Multiplexer.IncludeDetailInExceptions, message.Command, message, ServerEndPoint);
}
SelectDatabase(connection, message);
if (!connection.TransactionActive)
{
var readmode = connection.GetReadModeCommand(isMasterOnly);
if (readmode != null)
{
connection.Enqueue(readmode);
readmode.WriteTo(connection);
readmode.SetRequestSent();
IncrementOpCount();
}
if (message.IsAsking)
{
var asking = ReusableAskingCommand;
connection.Enqueue(asking);
asking.WriteImpl(connection);
asking.SetRequestSent();
IncrementOpCount();
}
}
switch (cmd)
{
case RedisCommand.WATCH:
case RedisCommand.MULTI:
connection.TransactionActive = true;
break;
case RedisCommand.UNWATCH:
case RedisCommand.EXEC:
case RedisCommand.DISCARD:
connection.TransactionActive = false;
break;
}
connection.Enqueue(message);
message.WriteImpl(connection);
message.SetRequestSent();
IncrementOpCount();
// some commands smash our ability to trust the database; some commands
// demand an immediate flush
switch (cmd)
{
case RedisCommand.EVAL:
case RedisCommand.EVALSHA:
if (!ServerEndPoint.GetFeatures().ScriptingDatabaseSafe)
{
connection.SetUnknownDatabase();
}
break;
case RedisCommand.UNKNOWN:
case RedisCommand.DISCARD:
case RedisCommand.EXEC:
connection.SetUnknownDatabase();
break;
}
return(true);
}
catch (RedisCommandException ex)
{
Trace("Write failed: " + ex.Message);
message.Fail(ConnectionFailureType.ProtocolFailure, ex);
CompleteSyncOrAsync(message);
// this failed without actually writing; we're OK with that... unless there's a transaction
if (connection != null && connection.TransactionActive)
{
// we left it in a broken state; need to kill the connection
connection.RecordConnectionFailed(ConnectionFailureType.ProtocolFailure, ex);
return(false);
}
return(true);
}
catch (Exception ex)
{
Trace("Write failed: " + ex.Message);
message.Fail(ConnectionFailureType.InternalFailure, ex);
CompleteSyncOrAsync(message);
// we're not sure *what* happened here; probably an IOException; kill the connection
connection?.RecordConnectionFailed(ConnectionFailureType.InternalFailure, ex);
return(false);
}
}