// internally, this is very similar to RawResult, except it is designed to be usable
// outside of the IO-processing pipeline: the buffers are standalone, etc
internal static RedisResult TryCreate(PhysicalConnection connection, RawResult result)
{
try
{
switch (result.Type)
{
case ResultType.Integer:
case ResultType.SimpleString:
case ResultType.BulkString:
return new SingleRedisResult(result.AsRedisValue());
case ResultType.MultiBulk:
var items = result.GetItems();
var arr = new RedisResult[items.Length];
for (int i = 0; i < arr.Length; i++)
{
var next = TryCreate(connection, items[i]);
if (next == null) return null; // means we didn't understand
arr[i] = next;
}
return new ArrayRedisResult(arr);
case ResultType.Error:
return new ErrorRedisResult(result.GetString());
default:
return null;
}
} catch(Exception ex)
{
connection?.OnInternalError(ex);
return null; // will be logged as a protocol fail by the processor
}
}
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.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
if(connection != null) connection.RecordConnectionFailed(ConnectionFailureType.InternalFailure, ex);
return false;
}
}
private void SelectDatabase(PhysicalConnection connection, Message message)
{
int db = message.Db;
if (db >= 0)
{
var sel = connection.GetSelectDatabaseCommand(db, message);
if (sel != null)
{
connection.Enqueue(sel);
sel.WriteImpl(connection);
sel.SetRequestSent();
IncrementOpCount();
}
}
}
private PhysicalConnection GetConnection(TextWriter log)
{
if (state == (int)State.Disconnected)
{
try
{
if (!multiplexer.IsDisposed)
{
Multiplexer.LogLocked(log, "Connecting {0}...", Name);
Multiplexer.Trace("Connecting...", Name);
if (ChangeState(State.Disconnected, State.Connecting))
{
Interlocked.Increment(ref socketCount);
Interlocked.Exchange(ref connectStartTicks, Environment.TickCount);
// separate creation and connection for case when connection completes synchronously
// in that case PhysicalConnection will call back to PhysicalBridge, and most of PhysicalBridge methods assumes that physical is not null;
physical = new PhysicalConnection(this);
physical.BeginConnect(log);
}
}
return null;
}
catch (Exception ex)
{
Multiplexer.LogLocked(log, "Connect {0} failed: {1}", Name, ex.Message);
Multiplexer.Trace("Connect failed: " + ex.Message, Name);
ChangeState(State.Disconnected);
OnInternalError(ex);
throw;
}
}
return physical;
}
/// <summary>
/// This writes a message **directly** to the output stream; note
/// that this ignores the queue, so should only be used *either*
/// from the regular dequeue loop, *or* from the "I've just
/// connected" handshake (when there is no dequeue loop) - otherwise,
/// you can pretty much assume you're going to destroy the stream
/// </summary>
internal bool WriteMessageDirect(PhysicalConnection tmp, Message next)
{
Trace("Writing: " + next);
if (next is IMultiMessage)
{
SelectDatabase(tmp, next); // need to switch database *before* the transaction
foreach (var subCommand in ((IMultiMessage)next).GetMessages(tmp))
{
if (!WriteMessageToServer(tmp, subCommand))
{
// we screwed up; abort; note that WriteMessageToServer already
// killed the underlying connection
Trace("Unable to write to server");
next.Fail(ConnectionFailureType.ProtocolFailure, null);
CompleteSyncOrAsync(next);
return false;
}
}
next.SetRequestSent();
return true;
}
else
{
return WriteMessageToServer(tmp, next);
}
}
internal void RemovePhysical(PhysicalConnection connection)
{
#pragma warning disable 0420
Interlocked.CompareExchange(ref physical, null, connection);
#pragma warning restore 0420
}
internal void OnFullyEstablished(PhysicalConnection connection)
{
Trace("OnFullyEstablished");
if (physical == connection && !isDisposed && ChangeState(State.ConnectedEstablishing, State.ConnectedEstablished))
{
reportNextFailure = reconfigureNextFailure = true;
Interlocked.Exchange(ref failConnectCount, 0);
serverEndPoint.OnFullyEstablished(connection);
multiplexer.RequestWrite(this, true);
if(connectionType == ConnectionType.Interactive) serverEndPoint.CheckInfoReplication();
}
else
{
try { connection.Dispose(); } catch { }
}
}
internal void OnDisconnected(ConnectionFailureType failureType, PhysicalConnection connection, out bool isCurrent, out State oldState)
{
Trace("OnDisconnected");
// if the next thing in the pipe is a PING, we can tell it that we failed (this really helps spot doomed connects)
// note that for simplicity we haven't removed it from the queue; that's OK
int count;
var ping = queue.PeekPing(out count);
if (ping != null)
{
Trace("Marking PING as failed (queue length: " + count + ")");
ping.Fail(failureType, null);
CompleteSyncOrAsync(ping);
}
oldState = default(State); // only defined when isCurrent = true
if (isCurrent = (physical == connection))
{
Trace("Bridge noting disconnect from active connection" + (isDisposed ? " (disposed)" : ""));
oldState = ChangeState(State.Disconnected);
physical = null;
if (!isDisposed && Interlocked.Increment(ref failConnectCount) == 1)
{
GetConnection(null); // try to connect immediately
}
}
else if (physical == null)
{
Trace("Bridge noting disconnect (already terminated)");
}
else
{
Trace("Bridge noting disconnect, but from different connection");
}
}
internal void OnConnectionFailed(PhysicalConnection connection, ConnectionFailureType failureType, Exception innerException)
{
if (reportNextFailure)
{
reportNextFailure = false; // until it is restored
var endpoint = serverEndPoint.EndPoint;
multiplexer.OnConnectionFailed(endpoint, connectionType, failureType, innerException, reconfigureNextFailure);
}
}
internal void OnConnected(PhysicalConnection connection, TextWriter log)
{
Trace("OnConnected");
if (physical == connection && !isDisposed && ChangeState(State.Connecting, State.ConnectedEstablishing))
{
serverEndPoint.OnEstablishing(connection, log);
}
else
{
try
{
connection.Dispose();
}
catch
{ }
}
}
public void Dispose()
{
isDisposed = true;
using (var tmp = physical)
{
physical = null;
}
}
private PhysicalConnection GetConnection()
{
if (state == (int)State.Disconnected)
{
try
{
if (!multiplexer.IsDisposed)
{
Multiplexer.Trace("Connecting...", Name);
if (ChangeState(State.Disconnected, State.Connecting))
{
Interlocked.Increment(ref socketCount);
physical = new PhysicalConnection(this);
}
}
return null;
}
catch (Exception ex)
{
Multiplexer.Trace("Connect failed: " + ex.Message, Name);
ChangeState(State.Disconnected);
OnInternalError(ex);
throw;
}
}
return physical;
}
