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Add server-side Streamable HTTP transport support (#330)

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- Changes IJsonRpcMessage to an abstract base class so RelatedTransport will always be available
- Streamable HTTP supports multiple concurrent HTTP request with their own indpendent SSE response streams
- RelatedTransport indicates the source or destination of the JsonRpcMessage

- Changes the default RequestId to a JSON number for better compatibility with MCP servers in the wild
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Stephen Halter 2025-04-18 17:07:23 -07:00 • committed by GitHub
commit 7dcba357d4
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1 changed files with 1637 additions and 395 deletions
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12
src/ModelContextProtocol/Protocol/Transport/TransportBase.cs
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@ -15,13 +15,13 @@ namespace ModelContextProtocol.Protocol.Transport;
/// </para>
/// <para>
/// Custom transport implementations should inherit from this class and implement the abstract
/// <see cref="SendMessageAsync(IJsonRpcMessage, CancellationToken)"/> and <see cref="DisposeAsync()"/> methods
/// <see cref="SendMessageAsync(JsonRpcMessage, CancellationToken)"/> and <see cref="DisposeAsync()"/> methods
/// to handle the specific transport mechanism being used.
/// </para>
/// </remarks>
public abstract partial class TransportBase : ITransport
{
private readonly Channel<IJsonRpcMessage> _messageChannel;
private readonly Channel<JsonRpcMessage> _messageChannel;
private readonly ILogger _logger;
private int _isConnected;
@ -34,7 +34,7 @@ public abstract partial class TransportBase : ITransport
_logger = loggerFactory?.CreateLogger(GetType()) ?? NullLogger.Instance;
// Unbounded channel to prevent blocking on writes
_messageChannel = Channel.CreateUnbounded<IJsonRpcMessage>(new UnboundedChannelOptions
_messageChannel = Channel.CreateUnbounded<JsonRpcMessage>(new UnboundedChannelOptions
{
SingleReader = true,
SingleWriter = true,
@ -56,10 +56,10 @@ public abstract partial class TransportBase : ITransport
public bool IsConnected => _isConnected == 1;
/// <inheritdoc/>
public ChannelReader<IJsonRpcMessage> MessageReader => _messageChannel.Reader;
public ChannelReader<JsonRpcMessage> MessageReader => _messageChannel.Reader;
/// <inheritdoc/>
public abstract Task SendMessageAsync(IJsonRpcMessage message, CancellationToken cancellationToken = default);
public abstract Task SendMessageAsync(JsonRpcMessage message, CancellationToken cancellationToken = default);
/// <inheritdoc/>
public abstract ValueTask DisposeAsync();
@ -69,7 +69,7 @@ public abstract partial class TransportBase : ITransport
/// </summary>
/// <param name="message">The message to write.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
protected async Task WriteMessageAsync(IJsonRpcMessage message, CancellationToken cancellationToken = default)
protected async Task WriteMessageAsync(JsonRpcMessage message, CancellationToken cancellationToken = default)
{
if (!IsConnected)
{