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Remove fast-path cancellation check from CallTool (#48)

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Stephen Toub 2025-03-09 06:18:21 -04:00 • committed by GitHub
commit 04af21046b
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1 changed files with 33 additions and 27 deletions
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66
src/mcpdotnet/Configuration/McpServerBuilderExtensions.Tools.cs
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@ -1,6 +1,7 @@
using System.ComponentModel;
using System.Globalization;
using System.Reflection;
using System.Runtime.ExceptionServices;
using System.Text.Json;
using McpDotNet.Configuration;
using McpDotNet.Protocol.Types;
@ -171,44 +172,49 @@ public static partial class McpServerBuilderExtensions
private static async Task<CallToolResponse> CallTool(RequestContext<CallToolRequestParams> request, MethodInfo method, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var methodParameters = method.GetParameters();
List<object?> parameters = ResolveParameters(request, methodParameters, cancellationToken);
if (cancellationToken.IsCancellationRequested)
return new CallToolResponse { Content = [new Content { Text = "Operation was cancelled" }] };
using var scope = request.Server.ServiceProvider?.CreateScope();
var objectInstance = CreateObjectInstance(method, scope?.ServiceProvider);
object? result;
try
{
using var scope = request.Server.ServiceProvider?.CreateScope();
var objectInstance = CreateObjectInstance(method, scope?.ServiceProvider);
var result = method.Invoke(objectInstance, parameters.ToArray());
if (result is Task task)
{
await task.ConfigureAwait(false);
var resultProperty = task.GetType().GetProperty("Result");
result = resultProperty?.GetValue(task);
}
if (result is string resultString)
return new CallToolResponse { Content = [new Content() { Text = resultString, Type = "text" }] };
if (result is string[] resultStringArray)
return new CallToolResponse { Content = resultStringArray.Select(s => new Content() { Text = s, Type = "text" }).ToList() };
if (result is null)
return new CallToolResponse { Content = [new Content() { Text = "null" }] };
if (result is JsonElement jsonElement)
return new CallToolResponse { Content = [new Content() { Text = jsonElement.GetRawText(), Type = "text" }] };
return new CallToolResponse { Content = [new Content() { Text = result.ToString(), Type = "text" }] };
const BindingFlags InvokeFlags =
#if NET
BindingFlags.DoNotWrapExceptions |
#endif
BindingFlags.Default;
result = method.Invoke(objectInstance, InvokeFlags, binder: null, parameters.ToArray(), culture: null);
}
catch (TargetInvocationException e)
catch (TargetInvocationException e) when (e.InnerException is not null)
{
throw new McpServerException(e.Message, e);
ExceptionDispatchInfo.Capture(e.InnerException).Throw();
throw; // unreachable
}
if (result is Task task)
{
await task.ConfigureAwait(false);
var resultProperty = task.GetType().GetProperty("Result");
result = resultProperty?.GetValue(task);
}
if (result is string resultString)
return new CallToolResponse { Content = [new Content() { Text = resultString, Type = "text" }] };
if (result is string[] resultStringArray)
return new CallToolResponse { Content = resultStringArray.Select(s => new Content() { Text = s, Type = "text" }).ToList() };
if (result is null)
return new CallToolResponse { Content = [new Content() { Text = "null" }] };
if (result is JsonElement jsonElement)
return new CallToolResponse { Content = [new Content() { Text = jsonElement.GetRawText(), Type = "text" }] };
return new CallToolResponse { Content = [new Content() { Text = result.ToString(), Type = "text" }] };
}
private static List<object?> ResolveParameters(RequestContext<CallToolRequestParams> request, ParameterInfo[] methodParameters, CancellationToken cancellationToken)