/// <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 FromByteArray_Throws_MessageException_On_Code_Mismatch()
{
var msg = new MessageBuilder()
.WriteCode(MessageCode.Distributed.BranchLevel)
.WriteInteger(1)
.Build();
var ex = Record.Exception(() => DistributedSearchRequest.FromByteArray(msg));
Assert.NotNull(ex);
Assert.IsType <MessageException>(ex);
}
public void FromByteArray_Returns_Expected_Data(string username, int token, string query)
{
var msg = new MessageBuilder()
.WriteCode(MessageCode.Distributed.SearchRequest)
.WriteInteger(0) // unknown
.WriteString(username)
.WriteInteger(token)
.WriteString(query)
.Build();
var response = DistributedSearchRequest.FromByteArray(msg);
Assert.Equal(username, response.Username);
Assert.Equal(token, response.Token);
Assert.Equal(query, response.Query);
}
/// <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);
}
}
/// <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 HandleMessage(object sender, byte[] message)
{
var connection = (IMessageConnection)sender;
var code = new MessageReader <MessageCode.Distributed>(message).ReadCode();
if (code != MessageCode.Distributed.SearchRequest)
{
Diagnostic.Debug($"Distributed message received: {code} from {connection.Username} ({connection.IPAddress}:{connection.Port})");
}
try
{
switch (code)
{
// some clients erroneously send code 93, which is a server code, in place of 3.
case MessageCode.Distributed.ServerSearchRequest:
case MessageCode.Distributed.SearchRequest:
var searchRequest = DistributedSearchRequest.FromByteArray(message);
SearchResponse searchResponse;
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.SearchRequestMessage, connection.Context, connection.Key));
SoulseekClient.DistributedConnectionManager.BroadcastMessageAsync(message).Forget();
if (SoulseekClient.Options.SearchResponseResolver == default)
{
break;
}
try
{
searchResponse = await SoulseekClient.Options.SearchResponseResolver(searchRequest.Username, searchRequest.Token, searchRequest.Query).ConfigureAwait(false);
if (searchResponse != null && searchResponse.FileCount > 0)
{
var(ip, port) = await SoulseekClient.GetUserAddressAsync(searchRequest.Username).ConfigureAwait(false);
var peerConnection = await SoulseekClient.PeerConnectionManager.GetOrAddMessageConnectionAsync(searchRequest.Username, ip, port, CancellationToken.None).ConfigureAwait(false);
await peerConnection.WriteAsync(searchResponse.ToByteArray()).ConfigureAwait(false);
}
}
catch (Exception ex)
{
Diagnostic.Warning($"Error resolving search response for query '{searchRequest.Query}' requested by {searchRequest.Username} with token {searchRequest.Token}: {ex.Message}", ex);
}
break;
case MessageCode.Distributed.Ping:
Diagnostic.Debug($"PING?");
var pingResponse = new PingResponse(SoulseekClient.GetNextToken());
await connection.WriteAsync(pingResponse.ToByteArray()).ConfigureAwait(false);
Diagnostic.Debug($"PONG!");
break;
case MessageCode.Distributed.BranchLevel:
var branchLevel = DistributedBranchLevel.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.BranchLevelMessage, connection.Context, connection.Key), branchLevel.Level);
if ((connection.Username, connection.IPAddress, connection.Port) == SoulseekClient.DistributedConnectionManager.Parent)
{
SoulseekClient.DistributedConnectionManager.SetBranchLevel(branchLevel.Level);
}
break;
case MessageCode.Distributed.BranchRoot:
var branchRoot = DistributedBranchRoot.FromByteArray(message);
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.BranchRootMessage, connection.Context, connection.Key), branchRoot.Username);
if ((connection.Username, connection.IPAddress, connection.Port) == SoulseekClient.DistributedConnectionManager.Parent)
{
SoulseekClient.DistributedConnectionManager.SetBranchRoot(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($"Unhandled distributed message: {code} from {connection.Username} ({connection.IPAddress}:{connection.Port}); {message.Length} bytes");
break;
}
}
catch (Exception ex)
{
Diagnostic.Warning($"Error handling distributed message: {code} from {connection.Username} ({connection.IPAddress}:{connection.Port}); {ex.Message}", ex);
}
}
/// <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.ServerSearchRequest)
{
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 get search requests with code DistributedServerSearchRequest.
// convert this message to a normal DistributedSearchRequest before forwarding. not sure if this is correct,
// but it would match the observed behavior. these messages may also be forwarded from the server message
// handler if we haven't connected to a distributed parent in a timely manner.
case MessageCode.Distributed.ServerSearchRequest:
var serverSearchRequest = DistributedServerSearchRequest.FromByteArray(message);
var forwardedSearchRequest = new DistributedSearchRequest(serverSearchRequest.Username, serverSearchRequest.Token, serverSearchRequest.Query);
_ = SoulseekClient.DistributedConnectionManager.BroadcastMessageAsync(forwardedSearchRequest.ToByteArray()).ConfigureAwait(false);
await TrySendSearchResults(serverSearchRequest.Username, serverSearchRequest.Token, serverSearchRequest.Query).ConfigureAwait(false);
break;
// if we are connected to anyone other than a branch root, we should get search requests with code
// SearchRequest. forward these requests as is.
case MessageCode.Distributed.SearchRequest:
var searchRequest = DistributedSearchRequest.FromByteArray(message);
_ = SoulseekClient.DistributedConnectionManager.BroadcastMessageAsync(searchRequest.ToByteArray()).ConfigureAwait(false);
await TrySendSearchResults(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.SetBranchLevel(branchLevel.Level);
}
break;
case MessageCode.Distributed.BranchRoot:
var branchRoot = DistributedBranchRoot.FromByteArray(message);
if ((connection.Username, connection.IPEndPoint) == SoulseekClient.DistributedConnectionManager.Parent)
{
SoulseekClient.DistributedConnectionManager.SetBranchRoot(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);
}
}