/// <summary>
/// Sends the pending response matching the specified <paramref name="responseToken"/>, if one exists.
/// </summary>
/// <remarks>
/// This overload is called by the listener when an incoming connection is established with a pierce firewall token,
/// and if that token doesn't match a pending solicitation, and if the token matches a cached search response. In this case,
/// the connection is retrieved from the cache and used to send the response.
/// </remarks>
/// <param name="responseToken">The token matching the pending response to send.</param>
/// <returns>The operation context, including a value indicating whether a response was successfully sent.</returns>
public async Task <bool> TryRespondAsync(int responseToken)
{
if (SoulseekClient.Options.SearchResponseCache != default)
{
bool cached;
(string Username, int Token, string Query, SearchResponse SearchResponse)record;
try
{
cached = SoulseekClient.Options.SearchResponseCache.TryRemove(responseToken, out record);
}
catch (Exception ex)
{
Diagnostic.Warning($"Error retrieving cached search response {responseToken}: {ex.Message}", ex);
return(false);
}
if (cached)
{
var(username, token, query, searchResponse) = record;
try
{
var peerConnection = await SoulseekClient.PeerConnectionManager.GetCachedMessageConnectionAsync(username).ConfigureAwait(false);
await peerConnection.WriteAsync(searchResponse.ToByteArray()).ConfigureAwait(false);
Diagnostic.Debug($"Sent cached response {responseToken} containing {searchResponse.FileCount + searchResponse.LockedFileCount} files to {username} for query '{query}' with token {token}");
ResponseDelivered?.Invoke(this, new SearchRequestResponseEventArgs(username, token, query, searchResponse));
return(true);
}
catch (Exception ex)
{
Diagnostic.Debug($"Failed to send cached search response {responseToken} to {username} for query '{query}' with token {token}: {ex.Message}", ex);
ResponseDeliveryFailed?.Invoke(this, new SearchRequestResponseEventArgs(username, token, query, searchResponse));
}
}
}
return(false);
}
/// <summary>
/// Discards the cached response matching the specified <paramref name="responseToken"/>, if one exists.
/// </summary>
/// <param name="responseToken">The token matching the cached response to discard.</param>
/// <returns>A value indicating whether the cached response was discarded.</returns>
public bool TryDiscard(int responseToken)
{
if (SoulseekClient.Options.SearchResponseCache != default)
{
try
{
if (SoulseekClient.Options.SearchResponseCache.TryRemove(responseToken, out var response))
{
var(username, token, query, searchResponse) = response;
Diagnostic.Debug($"Discarded cached search response {responseToken} to {username} for query '{query}' with token {token}");
ResponseDeliveryFailed?.Invoke(this, new SearchRequestResponseEventArgs(username, token, query, searchResponse));
return(true);
}
}
catch (Exception ex)
{
Diagnostic.Warning($"Error removing cached search response {responseToken}: {ex.Message}", ex);
return(false);
}
}
return(false);
}