Initial QSfera import

Server/pkg/checks/checkgrpc.go

@@ -0,0 +1,27 @@
+package checks
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/qsfera/server/pkg/handlers"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+// NewGRPCCheck checks the reachability of a grpc server.
+func NewGRPCCheck(address string) func(context.Context) error {
+	return func(_ context.Context) error {
+		address, err := handlers.FailSaveAddress(address)
+		if err != nil {
+			return err
+		}
+
+		conn, err := grpc.NewClient(address, grpc.WithTransportCredentials(insecure.NewCredentials()))
+		if err != nil {
+			return fmt.Errorf("could not connect to grpc server: %v", err)
+		}
+		_ = conn.Close()
+		return nil
+	}
+}