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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
This commit is contained in:
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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10
src/ModelContextProtocol/Protocol/Transport/StreamClientSessionTransport.cs
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@ -57,7 +57,7 @@ internal class StreamClientSessionTransport : TransportBase
}
/// <inheritdoc/>
public override async Task SendMessageAsync(IJsonRpcMessage message, CancellationToken cancellationToken = default)
public override async Task SendMessageAsync(JsonRpcMessage message, CancellationToken cancellationToken = default)
{
if (!IsConnected)
{
@ -65,12 +65,12 @@ internal class StreamClientSessionTransport : TransportBase
}
string id = "(no id)";
if (message is IJsonRpcMessageWithId messageWithId)
if (message is JsonRpcMessageWithId messageWithId)
{
id = messageWithId.Id.ToString();
}
var json = JsonSerializer.Serialize(message, McpJsonUtilities.DefaultOptions.GetTypeInfo(typeof(IJsonRpcMessage)));
var json = JsonSerializer.Serialize(message, McpJsonUtilities.DefaultOptions.GetTypeInfo(typeof(JsonRpcMessage)));
using var _ = await _sendLock.LockAsync(cancellationToken).ConfigureAwait(false);
try
@ -143,11 +143,11 @@ internal class StreamClientSessionTransport : TransportBase
{
try
{
var message = (IJsonRpcMessage?)JsonSerializer.Deserialize(line.AsSpan().Trim(), McpJsonUtilities.DefaultOptions.GetTypeInfo(typeof(IJsonRpcMessage)));
var message = (JsonRpcMessage?)JsonSerializer.Deserialize(line.AsSpan().Trim(), McpJsonUtilities.DefaultOptions.GetTypeInfo(typeof(JsonRpcMessage)));
if (message != null)
{
string messageId = "(no id)";
if (message is IJsonRpcMessageWithId messageWithId)
if (message is JsonRpcMessageWithId messageWithId)
{
messageId = messageWithId.Id.ToString();
}