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internal/mcp: meta and progress token

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Meta is a struct that contains a map[string]any, and a ProgressToken
field.

Each Params and Result type has a Meta as a value field.

Meta marshals and unmarshals specially, so the ProgressToken field
becomes part of the map. The marshalling code is generalized in
anticipation of every Params and Result growing a map of additional
properties.

Change-Id: I6d2f34270d33501c96437f24f91ef3e51d20d955
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674956
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Jonathan Amsterdam 2025-05-21 07:11:50 -04:00 • committed by Gopher Robot
commit 7130f0f081
1 changed files with 548 additions and 115 deletions
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14
mcp/server.go
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@ -157,7 +157,7 @@ func (s *Server) RemoveResources(uris ...string) {
// changeAndNotify is called when a feature is added or removed.
// It calls change, which should do the work and report whether a change actually occurred.
// If there was a change, it notifies a snapshot of the sessions.
func (s *Server) changeAndNotify(notification string, params any, change func() bool) {
func (s *Server) changeAndNotify(notification string, params Params, change func() bool) {
var sessions []*ServerSession
// Lock for the change, but not for the notification.
s.mu.Lock()
@ -358,11 +358,11 @@ func (s *Server) Connect(ctx context.Context, t Transport) (*ServerSession, erro
return connect(ctx, t, s)
}
func (s *Server) callInitializedHandler(ctx context.Context, ss *ServerSession, params *InitializedParams) (any, error) {
func (s *Server) callInitializedHandler(ctx context.Context, ss *ServerSession, params *InitializedParams) (Result, error) {
return callNotificationHandler(ctx, s.opts.InitializedHandler, ss, params)
}
func (s *Server) callRootsListChangedHandler(ctx context.Context, ss *ServerSession, params *RootsListChangedParams) (any, error) {
func (s *Server) callRootsListChangedHandler(ctx context.Context, ss *ServerSession, params *RootsListChangedParams) (Result, error) {
return callNotificationHandler(ctx, s.opts.RootsListChangedHandler, ss, params)
}
@ -519,15 +519,15 @@ func (ss *ServerSession) initialize(ctx context.Context, params *InitializeParam
}, nil
}
func (ss *ServerSession) ping(context.Context, *PingParams) (struct{}, error) {
return struct{}{}, nil
func (ss *ServerSession) ping(context.Context, *PingParams) (Result, error) {
return emptyResult{}, nil
}
func (ss *ServerSession) setLevel(_ context.Context, params *SetLevelParams) (struct{}, error) {
func (ss *ServerSession) setLevel(_ context.Context, params *SetLevelParams) (Result, error) {
ss.mu.Lock()
defer ss.mu.Unlock()
ss.logLevel = params.Level
return struct{}{}, nil
return emptyResult{}, nil
}
// Close performs a graceful shutdown of the connection, preventing new