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Move notification handler registrations to capabilities (#207)

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* Move notification handler registrations to capabilities

Currently request handlers are set on the capability objects, but notification handlers are set after construction via an AddNotificationHandler method on the IMcpEndpoint interface. This moves handler specification to be at construction as well. This makes it more consistent with request handlers, simplifies the IMcpEndpoint interface to just be about message sending, and avoids a concurrency bug that could occur if someone tried to add a handler while the endpoint was processing notifications.

* Address more feedback and further cleanup
This commit is contained in:
Stephen Toub 2025-04-04 13:11:07 -04:00 • committed by GitHub
commit d21d933876
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1 changed files with 292 additions and 288 deletions
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47
tests/ModelContextProtocol.Tests/SseIntegrationTests.cs
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@ -29,11 +29,6 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
await using InMemoryTestSseServer server = new(CreatePortNumber(), LoggerFactory.CreateLogger<InMemoryTestSseServer>());
await server.StartAsync();
var defaultOptions = new McpClientOptions
{
ClientInfo = new() { Name = "IntegrationTestClient", Version = "1.0.0" }
};
var defaultConfig = new McpServerConfig
{
Id = "test_server",
@ -46,7 +41,6 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
// Act
await using var client = await McpClientFactory.CreateAsync(
defaultConfig,
defaultOptions,
loggerFactory: LoggerFactory,
cancellationToken: TestContext.Current.CancellationToken);
@ -120,11 +114,6 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
int samplingHandlerCalls = 0;
var defaultOptions = new McpClientOptions
{
ClientInfo = new()
{
Name = "IntegrationTestClient",
Version = "1.0.0"
},
Capabilities = new()
{
Sampling = new()
@ -175,11 +164,6 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
server.UseFullUrlForEndpointEvent = true;
await server.StartAsync();
var defaultOptions = new McpClientOptions
{
ClientInfo = new() { Name = "IntegrationTestClient", Version = "1.0.0" }
};
var defaultConfig = new McpServerConfig
{
Id = "test_server",
@ -192,7 +176,6 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
// Act
await using var client = await McpClientFactory.CreateAsync(
defaultConfig,
defaultOptions,
loggerFactory: LoggerFactory,
cancellationToken: TestContext.Current.CancellationToken);
@ -213,12 +196,6 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
await using InMemoryTestSseServer server = new(CreatePortNumber(), LoggerFactory.CreateLogger<InMemoryTestSseServer>());
await server.StartAsync();
var defaultOptions = new McpClientOptions
{
ClientInfo = new() { Name = "IntegrationTestClient", Version = "1.0.0" }
};
var defaultConfig = new McpServerConfig
{
Id = "test_server",
@ -229,24 +206,28 @@ public class SseIntegrationTests(ITestOutputHelper outputHelper) : LoggedTest(ou
};
// Act
var receivedNotification = new TaskCompletionSource<string?>();
await using var client = await McpClientFactory.CreateAsync(
defaultConfig,
defaultOptions,
new()
{
Capabilities = new()
{
NotificationHandlers = [new("test/notification", args =>
{
var msg = args.Params?["message"]?.GetValue<string>();
receivedNotification.SetResult(msg);
return Task.CompletedTask;
})],
},
},
loggerFactory: LoggerFactory,
cancellationToken: TestContext.Current.CancellationToken);
// Wait for SSE connection to be established
await server.WaitForConnectionAsync(TimeSpan.FromSeconds(10));
var receivedNotification = new TaskCompletionSource<string?>();
client.AddNotificationHandler("test/notification", (args) =>
{
var msg = args.Params?["message"]?.GetValue<string>();
receivedNotification.SetResult(msg);
return Task.CompletedTask;
});
// Act
await server.SendTestNotificationAsync("Hello from server!");