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main.go
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main.go
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// Copyright (c) 2017 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 main
import (
"io"
"log"
"net"
"time"
"github.com/ligato/cn-infra/agent"
"github.com/ligato/cn-infra/infra"
"github.com/ligato/cn-infra/logging/logrus"
"github.com/namsral/flag"
"golang.org/x/net/context"
"google.golang.org/grpc"
"github.com/ligato/vpp-agent/api/configurator"
)
var (
address = flag.String("address", "localhost:9111", "address of GRPC server")
socketType = flag.String("socket-type", "tcp", "[tcp, tcp4, tcp6, unix, unixpacket]")
reqPer = flag.Int("request-period", 3, "notification request period in seconds")
)
// Start Agent plugins selected for this example.
func main() {
// Inject dependencies to example plugin
ep := &ExamplePlugin{}
ep.SetName("remote-client-example")
ep.Setup()
// Start Agent
a := agent.NewAgent(
agent.AllPlugins(ep),
)
if err := a.Run(); err != nil {
log.Fatal()
}
}
// ExamplePlugin demonstrates the use of grpc to watch on VPP notifications using vpp-agent.
type ExamplePlugin struct {
infra.PluginDeps
conn *grpc.ClientConn
}
// Init initializes example plugin.
func (p *ExamplePlugin) Init() (err error) {
// Set up connection to the server.
p.conn, err = grpc.Dial("unix",
grpc.WithInsecure(),
grpc.WithDialer(dialer(*socketType, *address, 2*time.Second)))
if err != nil {
return err
}
client := configurator.NewConfiguratorClient(p.conn)
// Start notification watcher.
go p.watchNotifications(client)
logrus.DefaultLogger().Info("Initialization of the example plugin has completed")
return err
}
// Get is an implementation of client-side statistics streaming.
func (p *ExamplePlugin) watchNotifications(client configurator.ConfiguratorClient) {
var nextIdx uint32
logrus.DefaultLogger().Info("Watching..")
for {
// Prepare request with the initial index
request := &configurator.NotificationRequest{
Idx: nextIdx,
}
// Get stream object
stream, err := client.Notify(context.Background(), request)
if err != nil {
logrus.DefaultLogger().Error(err)
return
}
// Receive all message from the stream
var recvNotifs int
for {
notif, err := stream.Recv()
if err == io.EOF {
if recvNotifs == 0 {
//logrus.DefaultLogger().Info("No new notifications")
} else {
logrus.DefaultLogger().Infof("%d new notifications received", recvNotifs)
}
break
}
if err != nil {
logrus.DefaultLogger().Error(err)
return
}
logrus.DefaultLogger().Infof("Notification[%d]: %v",
notif.NextIdx-1, notif.Notification)
nextIdx = notif.NextIdx
recvNotifs++
}
// Wait till next request
time.Sleep(time.Duration(*reqPer) * time.Second)
}
}
// Dialer for unix domain socket
func dialer(socket, address string, timeoutVal time.Duration) func(string, time.Duration) (net.Conn, error) {
return func(addr string, timeout time.Duration) (net.Conn, error) {
// Pass values
addr, timeout = address, timeoutVal
// Dial with timeout
return net.DialTimeout(socket, addr, timeoutVal)
}
}