Basic BBSimCtl implementation

Change-Id: Ib5e6f7f462cdb10a3d976b99812658bf7e225dfb
diff --git a/internal/bbsimctl/commands/olt.go b/internal/bbsimctl/commands/olt.go
new file mode 100644
index 0000000..7f698f1
--- /dev/null
+++ b/internal/bbsimctl/commands/olt.go
@@ -0,0 +1,111 @@
+/*
+ * 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"
+	"fmt"
+	"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"
+	"google.golang.org/grpc"
+	"os"
+)
+
+const (
+	DEFAULT_OLT_DEVICE_HEADER_FORMAT = "table{{ .ID }}\t{{ .SerialNumber }}\t{{ .OperState }}\t{{ .InternalState }}"
+	DEFAULT_PORT_HEADER_FORMAT       = "table{{ .ID }}\t{{ .OperState }}"
+)
+
+type OltGet struct{}
+
+type OltNNIs struct{}
+
+type OltPONs struct{}
+
+// TODO add autocomplete
+type oltOptions struct {
+	Get OltGet  `command:"get"`
+	NNI OltNNIs `command:"nnis"`
+	PON OltPONs `command:"pons"`
+}
+
+func RegisterOltCommands(parser *flags.Parser) {
+	parser.AddCommand("olt", "OLT Commands", "Commands to query and manipulate the OLT device", &oltOptions{})
+}
+
+func getOLT() *pb.Olt {
+	conn, err := grpc.Dial(config.GlobalConfig.Server, grpc.WithInsecure())
+	if err != nil {
+		log.Fatal("did not connect: %v", err)
+		return nil
+	}
+	defer conn.Close()
+	c := pb.NewBBSimClient(conn)
+
+	// Contact the server and print out its response.
+
+	ctx, cancel := context.WithTimeout(context.Background(), config.GlobalConfig.Grpc.Timeout)
+	defer cancel()
+	olt, err := c.GetOlt(ctx, &pb.Empty{})
+	if err != nil {
+		log.Fatal("could not get OLT: %v", err)
+		return nil
+	}
+	return olt
+}
+
+func printOltHeader(prefix string, o *pb.Olt) {
+	fmt.Println(fmt.Sprintf("%s : %s", prefix, o.SerialNumber))
+	fmt.Println()
+}
+
+// TODO use voltctl or cordctl parser to print tables (this needs to be moved out of the internals package)
+func (o *OltGet) Execute(args []string) error {
+	olt := getOLT()
+
+	// print out
+	tableFormat := format.Format(DEFAULT_OLT_DEVICE_HEADER_FORMAT)
+	tableFormat.Execute(os.Stdout, true, olt)
+
+	return nil
+}
+
+func (o *OltNNIs) Execute(args []string) error {
+	olt := getOLT()
+
+	printOltHeader("NNI Ports for", olt)
+
+	tableFormat := format.Format(DEFAULT_PORT_HEADER_FORMAT)
+	tableFormat.Execute(os.Stdout, true, olt.NNIPorts)
+
+	return nil
+}
+
+func (o *OltPONs) Execute(args []string) error {
+	olt := getOLT()
+
+	printOltHeader("PON Ports for", olt)
+
+	tableFormat := format.Format(DEFAULT_PORT_HEADER_FORMAT)
+	tableFormat.Execute(os.Stdout, true, olt.PONPorts)
+
+	return nil
+}