implement econet exporter

pkg/econet/econetmcp/server.go

@@ -0,0 +1,64 @@
+/*
+Package econetmcp exposes an MCP server, mounted as an HTTP handler at
+/api/mcp, whose tools wrap the EconetService gRPC API.
+*/
+package econetmcp
+
+import (
+	"context"
+	"net/http"
+
+	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+	"github.com/rs/zerolog"
+
+	"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 {
+	// NOTE: Add other tools here
+	m.addListDevicesTool()
+
+	handler := mcp.NewStreamableHTTPHandler(func(*http.Request) *mcp.Server {
+		return m.server
+	}, &mcp.StreamableHTTPOptions{})
+
+	m.log.Debug().Msg("Econet MCP tools ready")
+
+	return []opts.HTTPHandler{
+		{
+			Prefix:  "/api/mcp",
+			Handler: handler,
+		},
+	}
+}