6e03217c83Handlers and client/server methods take a single request argument combining the session and params. This slightly simplifies the signature for handlers, since there is no longer an often-ignored session argument. But more importantly, it opens the door to adding more information in requests, such as auth info and HTTP request headers. For #243.
31 lines
868 B
Go
31 lines
868 B
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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"sync/atomic"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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var nextProgressToken atomic.Int64
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// This middleware function adds a progress token to every outgoing request
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// from the client.
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func Example_progressMiddleware() {
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c := mcp.NewClient(testImpl, nil)
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c.AddSendingMiddleware(addProgressToken[*mcp.ClientSession])
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_ = c
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}
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func addProgressToken[S mcp.Session](h mcp.MethodHandler) mcp.MethodHandler {
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return func(ctx context.Context, method string, req mcp.Request) (result mcp.Result, err error) {
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if rp, ok := req.GetParams().(mcp.RequestParams); ok {
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rp.SetProgressToken(nextProgressToken.Add(1))
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}
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return h(ctx, method, req)
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}
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}
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