[VOL-2778] Introducing Service definition in order to support the TT workflow

Change-Id: Ib171502e8940b5d0b219620a4503f7095d376d7a
diff --git a/internal/bbsimctl/commands/services.go b/internal/bbsimctl/commands/services.go
new file mode 100644
index 0000000..929266d
--- /dev/null
+++ b/internal/bbsimctl/commands/services.go
@@ -0,0 +1,71 @@
+/*
+ * Portions copyright 2019-present Open Networking Foundation
+ * Original copyright 2019-present Ciena Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package commands
+
+import (
+	"context"
+	"github.com/jessevdk/go-flags"
+	pb "github.com/opencord/bbsim/api/bbsim"
+	"github.com/opencord/bbsim/internal/bbsimctl/config"
+	"github.com/opencord/cordctl/pkg/format"
+	log "github.com/sirupsen/logrus"
+	"os"
+)
+
+const (
+	DEFAULT_SERVICE_HEADER_FORMAT = "table{{ .OnuSn }}\t{{ .Name }}\t{{ .HwAddress }}\t{{ .STag }}\t{{ .CTag }}\t{{ .NeedsEapol }}\t{{ .NeedsDhcp }}\t{{ .NeedsIgmp }}\t{{ .GemPort }}\t{{ .EapolState }}\t{{ .DhcpState }}"
+)
+
+type ServiceList struct{}
+
+type ServiceOptions struct {
+	List ServiceList `command:"list"`
+}
+
+func RegisterServiceCommands(parser *flags.Parser) {
+	_, _ = parser.AddCommand("service", "Service Commands", "Commands to interact with ONU Services", &ServiceOptions{})
+}
+
+func getServices() *pb.Services {
+
+	client, conn := connect()
+	defer conn.Close()
+
+	// Contact the server and print out its response.
+	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
+	defer cancel()
+
+	services, err := client.GetServices(ctx, &pb.Empty{})
+	if err != nil {
+		log.Fatalf("could not get OLT: %v", err)
+		return nil
+	}
+	return services
+}
+
+func (options *ServiceList) Execute(args []string) error {
+	services := getServices()
+
+	// print out
+	tableFormat := format.Format(DEFAULT_SERVICE_HEADER_FORMAT)
+	if err := tableFormat.Execute(os.Stdout, true, services.Items); err != nil {
+		log.Fatalf("Error while formatting ONUs table: %s", err)
+	}
+
+	return nil
+}