Introduce proxy for VPP

- proxy server defines RPC service for proxying binapi/stats to VPP
- use cmd/vpp-proxy for proxy server/client

Change-Id: I6e698e166ecf6db7109ae5adf8a93f308d3f3f2a
Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

1 files changed, 102 insertions, 0 deletions

diff --git a/proxy/proxy.go b/proxy/proxy.go
new file mode 100644
index 0000000..1f8f824
--- /dev/null
+++ b/proxy/proxy.go
@@ -0,0 +1,102 @@
+//  Copyright (c) 2019 Cisco and/or its affiliates.
+//
+//  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 proxy
+
+import (
+	"log"
+	"net"
+	"net/http"
+	"net/rpc"
+
+	"git.fd.io/govpp.git/adapter"
+	"git.fd.io/govpp.git/core"
+)
+
+// Server defines a proxy server that serves client requests to stats and binapi.
+type Server struct {
+	rpc *rpc.Server
+
+	statsConn  *core.StatsConnection
+	binapiConn *core.Connection
+}
+
+func NewServer() *Server {
+	return &Server{
+		rpc: rpc.NewServer(),
+	}
+}
+
+func (p *Server) ConnectStats(stats adapter.StatsAPI) error {
+	var err error
+	p.statsConn, err = core.ConnectStats(stats)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (p *Server) DisconnectStats() {
+	if p.statsConn != nil {
+		p.statsConn.Disconnect()
+	}
+}
+
+func (p *Server) ConnectBinapi(binapi adapter.VppAPI) error {
+	var err error
+	p.binapiConn, err = core.Connect(binapi)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (p *Server) DisconnectBinapi() {
+	if p.binapiConn != nil {
+		p.binapiConn.Disconnect()
+	}
+}
+
+func (p *Server) ListenAndServe(addr string) {
+	if p.statsConn != nil {
+		statsRPC := NewStatsRPC(p.statsConn)
+		if err := p.rpc.Register(statsRPC); err != nil {
+			panic(err)
+		}
+	}
+	if p.binapiConn != nil {
+		ch, err := p.binapiConn.NewAPIChannel()
+		if err != nil {
+			panic(err)
+		}
+		binapiRPC := NewBinapiRPC(ch)
+		if err := p.rpc.Register(binapiRPC); err != nil {
+			panic(err)
+		}
+	}
+
+	p.rpc.HandleHTTP(rpc.DefaultRPCPath, rpc.DefaultDebugPath)
+
+	l, e := net.Listen("tcp", addr)
+	if e != nil {
+		log.Fatal("listen error:", e)
+	}
+	defer l.Close()
+
+	log.Printf("proxy serving on: %v", addr)
+
+	if err := http.Serve(l, nil); err != nil {
+		log.Fatalln(err)
+	}
+}