feat: user service

gateway/internal/downstream/userservice/routes.go

@@ -0,0 +1,46 @@
+package userservice
+
+import (
+	"context"
+
+	"galaxy/gateway/internal/downstream"
+	usermodel "galaxy/model/user"
+)
+
+var noOpClose = func() error { return nil }
+
+// NewRoutes returns the reserved authenticated gateway routes owned by the
+// Gateway -> User self-service boundary.
+//
+// When baseURL is empty, the returned routes still reserve the stable
+// `user.*` message types but resolve them to a dependency-unavailable client
+// so callers receive the transport-level unavailable outcome instead of a
+// route-miss error.
+func NewRoutes(baseURL string) (map[string]downstream.Client, func() error, error) {
+	client := downstream.Client(unavailableClient{})
+	closeFn := noOpClose
+
+	if baseURL != "" {
+		httpClient, err := NewHTTPClient(baseURL)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		client = httpClient
+		closeFn = httpClient.Close
+	}
+
+	return map[string]downstream.Client{
+		usermodel.MessageTypeGetMyAccount:     client,
+		usermodel.MessageTypeUpdateMyProfile:  client,
+		usermodel.MessageTypeUpdateMySettings: client,
+	}, closeFn, nil
+}
+
+type unavailableClient struct{}
+
+func (unavailableClient) ExecuteCommand(context.Context, downstream.AuthenticatedCommand) (downstream.UnaryResult, error) {
+	return downstream.UnaryResult{}, downstream.ErrDownstreamUnavailable
+}
+
+var _ downstream.Client = unavailableClient{}