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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 (
"fmt"
"io"
"log"
"net"
"os"
"time"
"github.com/ligato/cn-infra/agent"
"github.com/ligato/cn-infra/logging"
"github.com/ligato/cn-infra/logging/logrus"
"github.com/ligato/vpp-agent/plugins/vpp/model/rpc"
"github.com/namsral/flag"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
const (
defaultAddress = "localhost:9111"
defaultSocket = "tcp"
requestPeriod = 3
)
var (
address = defaultAddress
socketType string
reqPer = requestPeriod
)
// init sets the default logging level
func init() {
logrus.DefaultLogger().SetOutput(os.Stdout)
logrus.DefaultLogger().SetLevel(logging.DebugLevel)
}
// Start Agent plugins selected for this example.
func main() {
flag.StringVar(&address, "address", defaultAddress, "address of GRPC server")
flag.StringVar(&socketType, "socket-type", defaultSocket, "[tcp, tcp4, tcp6, unix, unixpacket]")
flag.IntVar(&reqPer, "request-period", requestPeriod, "notification request period in seconds")
// Inject dependencies to example plugin
ep := &ExamplePlugin{}
// Start Agent
a := agent.NewAgent(
agent.AllPlugins(ep),
)
if err := a.Run(); err != nil {
log.Fatal()
}
}
// PluginName represents name of plugin.
const PluginName = "grpc-notification-example"
// ExamplePlugin demonstrates the use of grpc to watch on VPP notifications using vpp-agent.
type ExamplePlugin struct {
conn *grpc.ClientConn
}
// Init initializes example plugin.
func (plugin *ExamplePlugin) Init() (err error) {
// Set up connection to the server.
switch socketType {
case "tcp", "tcp4", "tcp6", "unix", "unixpacket":
plugin.conn, err = grpc.Dial("unix", grpc.WithInsecure(),
grpc.WithDialer(dialer(socketType, address, 2*time.Second)))
default:
return fmt.Errorf("unknown gRPC socket type: %s", socketType)
}
if err != nil {
return err
}
// Start notification watcher.
go plugin.watchNotifications()
logrus.DefaultLogger().Info("Initialization of the example plugin has completed")
return err
}
// Close does nothing
func (plugin *ExamplePlugin) Close() error {
return nil
}
// String returns plugin name
func (plugin *ExamplePlugin) String() string {
return PluginName
}
// Get is an implementation of client-side statistics streaming.
func (plugin *ExamplePlugin) watchNotifications() {
var nextIdx uint32 = 1
for {
// Get client for notification service
client := rpc.NewNotificationServiceClient(plugin.conn)
// Prepare request with the initial index
request := &rpc.NotificationRequest{
Idx: nextIdx,
}
// Get stream object
stream, err := client.Get(context.Background(), request)
if err != nil {
logrus.DefaultLogger().Error(err)
return
}
// Receive all message from the stream
logrus.DefaultLogger().Info("Sending request ... ")
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("(IDX: %d) Received notif: %v",
notif.NextIdx-1, notif.NIf)
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)
}
}