feat: implement grpc health service checking database connection (#4499)

server/router/api/v1/health_service.go

@@ -0,0 +1,21 @@
+package v1
+
+import (
+	"context"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/health/grpc_health_v1"
+	"google.golang.org/grpc/status"
+
+	"github.com/usememos/memos/store"
+)
+
+func (s *APIV1Service) Check(ctx context.Context,
+	_ *grpc_health_v1.HealthCheckRequest) (*grpc_health_v1.HealthCheckResponse, error) {
+	history, err := s.Store.GetDriver().FindMigrationHistoryList(ctx, &store.FindMigrationHistory{})
+	if err != nil || len(history) == 0 {
+		return nil, status.Errorf(codes.Unavailable, "not available")
+	}
+
+	return &grpc_health_v1.HealthCheckResponse{Status: grpc_health_v1.HealthCheckResponse_SERVING}, nil
+}