010bdbc64dThis PR fixes goroutine leaks in all unit tests. To find the leaks I integrated https://github.com/uber-go/goleak and I suggest to keep using it to catch any future regressions. I used the folowing script to more easily find individual tests which were leaking goroutines: ``` for t in $(go test -run=Nothing -list=. ./mcp | grep -v ok); do go test ./mcp -run="$t" > /dev/null && echo -n . || echo -e "\nDetected leak: $t"; done ```
141 lines
3.5 KiB
Go
141 lines
3.5 KiB
Go
// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package mcp_test
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import (
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"context"
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"fmt"
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"log"
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"github.com/google/jsonschema-go/jsonschema"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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// !+roots
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func Example_roots() {
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ctx := context.Background()
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// Create a client with a single root.
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c := mcp.NewClient(&mcp.Implementation{Name: "client", Version: "v0.0.1"}, nil)
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c.AddRoots(&mcp.Root{URI: "file://a"})
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// Now create a server with a handler to receive notifications about roots.
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rootsChanged := make(chan struct{})
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handleRootsChanged := func(ctx context.Context, req *mcp.RootsListChangedRequest) {
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rootList, err := req.Session.ListRoots(ctx, nil)
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if err != nil {
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log.Fatal(err)
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}
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var roots []string
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for _, root := range rootList.Roots {
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roots = append(roots, root.URI)
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}
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fmt.Println(roots)
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close(rootsChanged)
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}
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s := mcp.NewServer(&mcp.Implementation{Name: "server", Version: "v0.0.1"}, &mcp.ServerOptions{
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RootsListChangedHandler: handleRootsChanged,
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})
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// Connect the server and client...
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t1, t2 := mcp.NewInMemoryTransports()
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serverSession, err := s.Connect(ctx, t1, nil)
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if err != nil {
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log.Fatal(err)
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}
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defer serverSession.Close()
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clientSession, err := c.Connect(ctx, t2, nil)
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if err != nil {
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log.Fatal(err)
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}
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defer clientSession.Close()
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// ...and add a root. The server is notified about the change.
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c.AddRoots(&mcp.Root{URI: "file://b"})
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<-rootsChanged
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// Output: [file://a file://b]
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}
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// !-roots
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// !+sampling
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func Example_sampling() {
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ctx := context.Background()
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// Create a client with a sampling handler.
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c := mcp.NewClient(&mcp.Implementation{Name: "client", Version: "v0.0.1"}, &mcp.ClientOptions{
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CreateMessageHandler: func(_ context.Context, req *mcp.CreateMessageRequest) (*mcp.CreateMessageResult, error) {
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return &mcp.CreateMessageResult{
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Content: &mcp.TextContent{
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Text: "would have created a message",
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},
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}, nil
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},
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})
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// Connect the server and client...
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ct, st := mcp.NewInMemoryTransports()
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s := mcp.NewServer(&mcp.Implementation{Name: "server", Version: "v0.0.1"}, nil)
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session, err := s.Connect(ctx, st, nil)
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if err != nil {
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log.Fatal(err)
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}
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defer session.Close()
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if _, err := c.Connect(ctx, ct, nil); err != nil {
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log.Fatal(err)
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}
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msg, err := session.CreateMessage(ctx, &mcp.CreateMessageParams{})
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println(msg.Content.(*mcp.TextContent).Text)
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// Output: would have created a message
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}
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// !-sampling
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// !+elicitation
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func Example_elicitation() {
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ctx := context.Background()
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ct, st := mcp.NewInMemoryTransports()
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s := mcp.NewServer(&mcp.Implementation{Name: "server", Version: "v0.0.1"}, nil)
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ss, err := s.Connect(ctx, st, nil)
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if err != nil {
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log.Fatal(err)
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}
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defer ss.Close()
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c := mcp.NewClient(&mcp.Implementation{Name: "client", Version: "v0.0.1"}, &mcp.ClientOptions{
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ElicitationHandler: func(context.Context, *mcp.ElicitRequest) (*mcp.ElicitResult, error) {
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return &mcp.ElicitResult{Action: "accept", Content: map[string]any{"test": "value"}}, nil
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},
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})
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if _, err := c.Connect(ctx, ct, nil); err != nil {
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log.Fatal(err)
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}
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res, err := ss.Elicit(ctx, &mcp.ElicitParams{
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Message: "This should fail",
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RequestedSchema: &jsonschema.Schema{
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Type: "object",
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Properties: map[string]*jsonschema.Schema{
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"test": {Type: "string"},
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},
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},
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})
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println(res.Content["test"])
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// Output: value
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}
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// !-elicitation
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