Add external grpc wire support (#548)

* add grpc wire

* cleanup file structure

* remove bin

* implement common wire library

* fix goroutines

* go mod tidy

* lint

* add tests

* add license

.gitignore

@@ -9,3 +9,5 @@ kne_cli/kne_cli
 kne_cli/kne
 controller/server/server
 x/webhook/webhook
+x/wire/client/client
+x/wire/server/server

go.mod

@@ -31,6 +31,7 @@ require (
 	github.com/wI2L/jsondiff v0.5.1
 	go.universe.tf/metallb v0.13.5
 	golang.org/x/oauth2 v0.14.0
+	golang.org/x/sync v0.5.0
 	google.golang.org/api v0.149.0
 	google.golang.org/grpc v1.61.0
 	google.golang.org/protobuf v1.33.0
@@ -136,7 +137,6 @@ require (
 	golang.org/x/crypto v0.21.0 // indirect
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
 	golang.org/x/net v0.23.0 // indirect
-	golang.org/x/sync v0.5.0 // indirect
 	golang.org/x/sys v0.18.0 // indirect
 	golang.org/x/term v0.18.0 // indirect
 	golang.org/x/text v0.14.0 // indirect

proto/generate.go

@@ -4,4 +4,5 @@ package proto
 //go:generate protoc --go_out=./topo --go_opt=paths=source_relative ./topo.proto
 //go:generate protoc --go_out=./ceos --go_opt=paths=source_relative ./ceos.proto
 //go:generate protoc --go_out=./controller --go-grpc_out=./controller --go-grpc_opt=paths=source_relative --go_opt=paths=source_relative ./controller.proto
+//go:generate protoc --go_out=./wire --go-grpc_out=./wire --go-grpc_opt=paths=source_relative --go_opt=paths=source_relative ./wire.proto
 //go:generate protoc --go_out=./event --go-grpc_out=./event --go-grpc_opt=paths=source_relative --go_opt=paths=source_relative ./event.proto

proto/wire.proto

@@ -0,0 +1,30 @@
+// Copyright 2024 Google LLC
+//
+// 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.
+syntax = "proto3";
+
+package wire;
+
+option go_package = "github.com/openconfig/kne/proto/wire";
+
+// Wire service definition.
+service Wire {
+  // Transmit sets up a bidirectional Packet stream.
+  // Metadata can be configured to identify the destination.
+  rpc Transmit(stream Packet) returns (stream Packet);
+}
+
+// Packet is a wrapper around bytes.
+message Packet {
+  bytes data = 1;
+}