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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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6
src/ModelContextProtocol/Diagnostics.cs
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@ -38,7 +38,7 @@ internal static class Diagnostics
};
#endif
internal static ActivityContext ExtractActivityContext(this DistributedContextPropagator propagator, IJsonRpcMessage message)
internal static ActivityContext ExtractActivityContext(this DistributedContextPropagator propagator, JsonRpcMessage message)
{
propagator.ExtractTraceIdAndState(message, ExtractContext, out var traceparent, out var tracestate);
ActivityContext.TryParse(traceparent, tracestate, true, out var activityContext);
@ -71,7 +71,7 @@ internal static class Diagnostics
}
}
internal static void InjectActivityContext(this DistributedContextPropagator propagator, Activity? activity, IJsonRpcMessage message)
internal static void InjectActivityContext(this DistributedContextPropagator propagator, Activity? activity, JsonRpcMessage message)
{
// noop if activity is null
propagator.Inject(activity, message, InjectContext);
@ -100,7 +100,7 @@ internal static class Diagnostics
}
}
internal static bool ShouldInstrumentMessage(IJsonRpcMessage message) =>
internal static bool ShouldInstrumentMessage(JsonRpcMessage message) =>
ActivitySource.HasListeners() &&
message switch
{