move to generated mcp for econet

pkg/econet/econet.go

@@ -16,7 +16,11 @@ import (
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/config"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetclient"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetgrpc"
-	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetmcp"
+	// MCP server. Aliased so switching implementations is a one-line change.
+	// Generated (protoc-gen-go-mcp) tools:
+	econetmcp "gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetmcpgen"
+	// Hand-written tools (switch back by using this import instead):
+	// econetmcp "gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetmcp"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetmetrics"
 	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/service"
 )

pkg/econet/econetmcpgen/server.go

@@ -0,0 +1,72 @@
+/*
+Package econetmcpgen exposes an MCP server, mounted as an HTTP handler at
+/api/mcp, whose tools are generated from the EconetService proto by
+protoc-gen-go-mcp and forwarded to the in-process gRPC server.
+
+It is the generated-code counterpart to econetmcp (which hand-writes a single
+list_water_heaters tool). Both expose an identical package API, so switching
+between them is a one-line import change in pkg/econet/econet.go.
+*/
+package econetmcpgen
+
+import (
+	"context"
+	"net/http"
+
+	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+	"github.com/redpanda-data/protoc-gen-go-mcp/pkg/runtime/gosdk"
+	"github.com/rs/zerolog"
+
+	v1alpha1mcp "gitea.libretechconsulting.com/rmcguire/econet-exporter/api/econet/v1alpha1/v1alpha1mcp"
+	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/config"
+	"gitea.libretechconsulting.com/rmcguire/econet-exporter/pkg/econet/econetgrpc"
+)
+
+var EconetMCPImpl = &mcp.Implementation{
+	Name:  "Econet MCP Server",
+	Title: "Econet Exporter MCP",
+}
+
+type EconetMCPServer struct {
+	ctx        context.Context
+	cfg        *config.ServiceConfig
+	log        *zerolog.Logger
+	server     *mcp.Server
+	econetGRPC *econetgrpc.EconetGRPCServer
+}
+
+func NewEconetMCPServer(ctx context.Context, cfg *config.ServiceConfig,
+	grpc *econetgrpc.EconetGRPCServer,
+) *EconetMCPServer {
+	return &EconetMCPServer{
+		ctx:        ctx,
+		cfg:        cfg,
+		log:        zerolog.Ctx(ctx),
+		econetGRPC: grpc,
+		server: mcp.NewServer(EconetMCPImpl, &mcp.ServerOptions{
+			Instructions: "Use these tools to inspect Rheem EcoNet water heaters: " +
+				"current mode, setpoint, hot water availability, connectivity, and alerts.",
+			HasTools: true,
+		}),
+	}
+}
+
+func (m *EconetMCPServer) GetHandlers() []opts.HTTPHandler {
+	// Register the generated tools against the in-process gRPC server via the
+	// go-sdk adapter, so the generated code shares our configured *mcp.Server.
+	v1alpha1mcp.RegisterEconetServiceHandler(gosdk.Wrap(m.server), m.econetGRPC)
+
+	handler := mcp.NewStreamableHTTPHandler(func(*http.Request) *mcp.Server {
+		return m.server
+	}, &mcp.StreamableHTTPOptions{})
+
+	m.log.Debug().Msg("Econet MCP tools ready (generated)")
+
+	return []opts.HTTPHandler{
+		{
+			Prefix:  "/api/mcp",
+			Handler: handler,
+		},
+	}
+}