/// <summary>
/// Handles embedded messages from the server.
/// </summary>
/// <param name="message">The message.</param>
public async void HandleEmbeddedMessage(byte[] message)
{
var code = MessageCode.Distributed.Unknown;
try
{
var embeddedMessage = EmbeddedMessage.FromByteArray(message);
code = embeddedMessage.DistributedCode;
var distributedMessage = embeddedMessage.DistributedMessage;
switch (code)
{
case MessageCode.Distributed.SearchRequest:
// receiving a SearchRequest/3 from the server as an embedded message indicates that we are
// operating as a branch root on the distributed network.
SoulseekClient.DistributedConnectionManager.PromoteToBranchRoot();
var searchRequest = DistributedSearchRequest.FromByteArray(distributedMessage);
_ = SoulseekClient.DistributedConnectionManager.BroadcastMessageAsync(message).ConfigureAwait(false);
await SoulseekClient.SearchResponder.TryRespondAsync(searchRequest.Username, searchRequest.Token, searchRequest.Query).ConfigureAwait(false);
break;
default:
Diagnostic.Debug($"Unhandled embedded message: {code}; {message.Length} bytes");
break;
}
}
catch (Exception ex)
{
Diagnostic.Warning($"Error handling embedded message: {code}; {ex.Message}", ex);
}
}
public void Parse_Throws_MessageReadException_On_Missing_Data()
{
var msg = new MessageBuilder()
.WriteCode(MessageCode.Server.EmbeddedMessage)
.Build();
var ex = Record.Exception(() => EmbeddedMessage.FromByteArray(msg));
Assert.NotNull(ex);
Assert.IsType <MessageReadException>(ex);
}
public void Parse_Throws_MessageException_On_Code_Mismatch()
{
var msg = new MessageBuilder()
.WriteCode(MessageCode.Peer.BrowseRequest)
.Build();
var ex = Record.Exception(() => EmbeddedMessage.FromByteArray(msg));
Assert.NotNull(ex);
Assert.IsType <MessageException>(ex);
}
internal void Parse_Returns_Expected_Data(MessageCode.Distributed code, byte[] message)
{
var msg = new MessageBuilder()
.WriteCode(MessageCode.Server.EmbeddedMessage)
.WriteByte((byte)code)
.WriteBytes(message)
.Build();
var r = EmbeddedMessage.FromByteArray(msg);
Assert.Equal(code, r.DistributedCode);
Assert.Equal(message.Length + 1, BitConverter.ToInt32(r.DistributedMessage.Take(4).ToArray()));
Assert.Equal((byte)code, r.DistributedMessage.Skip(4).Take(1).First());
Assert.Equal(message, r.DistributedMessage.Skip(5));
}
/// <summary>
/// Handles incoming messages.
/// </summary>
/// <param name="sender">The <see cref="IMessageConnection"/> instance from which the message originated.</param>
/// <param name="message">The message.</param>
public async void HandleMessageRead(object sender, byte[] message)
{
var connection = (IMessageConnection)sender;
var code = new MessageReader <MessageCode.Distributed>(message).ReadCode();
if (code != MessageCode.Distributed.SearchRequest && code != MessageCode.Distributed.EmbeddedMessage)
{
Diagnostic.Debug($"Distributed message received: {code} from {connection.Username} ({connection.IPEndPoint}) (id: {connection.Id})");
}
else if (SoulseekClient.Options.DeduplicateSearchRequests)
{
var current = Convert.ToBase64String(message);
if (DeduplicationHash == current)
{
return;
}
DeduplicationHash = current;
}
try
{
switch (code)
{
// if we are connected to a branch root, we will receive EmbeddedMessage/93.
case MessageCode.Distributed.EmbeddedMessage:
var embeddedMessage = EmbeddedMessage.FromByteArray(message);
switch (embeddedMessage.DistributedCode)
{
// convert this message to a normal DistributedSearchRequest before forwarding. this functionality is based
// on the observation that branch roots send embedded messages to children, while parents that are not a branch root
// send a plain SearchRequest/3.
case MessageCode.Distributed.SearchRequest:
var embeddedSearchRequest = DistributedSearchRequest.FromByteArray(embeddedMessage.DistributedMessage);
_ = SoulseekClient.DistributedConnectionManager.BroadcastMessageAsync(embeddedMessage.DistributedMessage).ConfigureAwait(false);
await SoulseekClient.SearchResponder.TryRespondAsync(embeddedSearchRequest.Username, embeddedSearchRequest.Token, embeddedSearchRequest.Query).ConfigureAwait(false);
break;
default:
Diagnostic.Debug($"Unhandled embedded message: {code} from {connection.Username} ({connection.IPEndPoint}); {message.Length} bytes");
break;
}
break;
// if we are connected to anyone other than a branch root, we will receive SearchRequest/3.
case MessageCode.Distributed.SearchRequest:
var searchRequest = DistributedSearchRequest.FromByteArray(message);
_ = SoulseekClient.DistributedConnectionManager.BroadcastMessageAsync(message).ConfigureAwait(false);
await SoulseekClient.SearchResponder.TryRespondAsync(searchRequest.Username, searchRequest.Token, searchRequest.Query).ConfigureAwait(false);
break;
case MessageCode.Distributed.Ping:
var pingResponse = DistributedPingResponse.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(MessageCode.Distributed.Ping, connection.Username), pingResponse);
break;
case MessageCode.Distributed.BranchLevel:
var branchLevel = DistributedBranchLevel.FromByteArray(message);
if ((connection.Username, connection.IPEndPoint) == SoulseekClient.DistributedConnectionManager.Parent)
{
SoulseekClient.DistributedConnectionManager.SetParentBranchLevel(branchLevel.Level);
}
break;
case MessageCode.Distributed.BranchRoot:
var branchRoot = DistributedBranchRoot.FromByteArray(message);
if ((connection.Username, connection.IPEndPoint) == SoulseekClient.DistributedConnectionManager.Parent)
{
SoulseekClient.DistributedConnectionManager.SetParentBranchRoot(branchRoot.Username);
}
break;
case MessageCode.Distributed.ChildDepth:
var childDepth = DistributedChildDepth.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.ChildDepthMessage, connection.Key), childDepth.Depth);
break;
default:
Diagnostic.Debug($"Unhandled distributed message: {code} from {connection.Username} ({connection.IPEndPoint}); {message.Length} bytes");
break;
}
}
catch (Exception ex)
{
Diagnostic.Warning($"Error handling distributed message: {code} from {connection.Username} ({connection.IPEndPoint}); {ex.Message}", ex);
}
}