go.ligato.io/vpp-agent/v3@v3.5.0/examples/grpc_vpp/stats_poller/main.go (about)

     1  //  Copyright (c) 2019 Cisco and/or its affiliates.
     2  //
     3  //  Licensed under the Apache License, Version 2.0 (the "License");
     4  //  you may not use this file except in compliance with the License.
     5  //  You may obtain a copy of the License at:
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //  Unless required by applicable law or agreed to in writing, software
    10  //  distributed under the License is distributed on an "AS IS" BASIS,
    11  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //  See the License for the specific language governing permissions and
    13  //  limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"context"
    19  	"errors"
    20  	"fmt"
    21  	"io"
    22  	"log"
    23  	"net"
    24  	"os"
    25  	"time"
    26  
    27  	"github.com/namsral/flag"
    28  	"go.ligato.io/cn-infra/v2/agent"
    29  	"go.ligato.io/cn-infra/v2/infra"
    30  	"google.golang.org/grpc"
    31  
    32  	"go.ligato.io/vpp-agent/v3/proto/ligato/configurator"
    33  )
    34  
    35  var (
    36  	address    = flag.String("address", "localhost:9111", "address of GRPC server")
    37  	socketType = flag.String("socket-type", "tcp", "[tcp, tcp4, tcp6, unix, unixpacket]")
    38  
    39  	period = flag.Uint("period", 3, "Polling period (in seconds)")
    40  	polls  = flag.Uint("polls", 0, "Number of pollings")
    41  )
    42  
    43  func main() {
    44  	ep := &ExamplePlugin{}
    45  	ep.SetName("stats-poller-example")
    46  	ep.Setup()
    47  
    48  	a := agent.NewAgent(
    49  		agent.AllPlugins(ep),
    50  	)
    51  	if err := a.Run(); err != nil {
    52  		log.Fatal()
    53  	}
    54  }
    55  
    56  // ExamplePlugin demonstrates the use of grpc to watch on VPP notifications using vpp-agent.
    57  type ExamplePlugin struct {
    58  	infra.PluginDeps
    59  
    60  	conn *grpc.ClientConn
    61  }
    62  
    63  // Init initializes example plugin.
    64  func (p *ExamplePlugin) Init() (err error) {
    65  	// Set up connection to the server.
    66  	p.conn, err = grpc.Dial("unix",
    67  		grpc.WithInsecure(),
    68  		grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
    69  			return net.DialTimeout(*socketType, *address, time.Second*3)
    70  		}),
    71  		//grpc.WithContextDialer(dialer(*socketType, *address, time.Second*3)),
    72  	)
    73  
    74  	if err != nil {
    75  		return err
    76  	}
    77  
    78  	client := configurator.NewStatsPollerServiceClient(p.conn)
    79  
    80  	// Start stats poller.
    81  	go p.pollStats(client)
    82  
    83  	return err
    84  }
    85  
    86  // Get is an implementation of client-side statistics streaming.
    87  func (p *ExamplePlugin) pollStats(client configurator.StatsPollerServiceClient) {
    88  	ctx := context.Background()
    89  
    90  	req := &configurator.PollStatsRequest{
    91  		PeriodSec: uint32(*period),
    92  		NumPolls:  uint32(*polls),
    93  	}
    94  	fmt.Printf("Polling stats: %v\n", req)
    95  
    96  	stream, err := client.PollStats(ctx, req)
    97  	if err != nil {
    98  		p.Log.Fatalln("PollStats failed:", err)
    99  	}
   100  
   101  	var lastSeq uint32
   102  	for {
   103  		resp, err := stream.Recv()
   104  		if errors.Is(err, io.EOF) {
   105  			p.Log.Infof("Polling has completed.")
   106  			os.Exit(0)
   107  		} else if err != nil {
   108  			p.Log.Fatalln("Recv failed:", err)
   109  		}
   110  
   111  		if resp.PollSeq != lastSeq {
   112  			fmt.Printf(" --- Poll sequence: %-3v\n", resp.PollSeq)
   113  		}
   114  		lastSeq = resp.PollSeq
   115  
   116  		vppStats := resp.GetStats().GetVppStats()
   117  		fmt.Printf("VPP stats: %v\n", vppStats)
   118  	}
   119  }
   120  
   121  // Dialer for unix domain socket
   122  func dialer(socket, address string, timeoutVal time.Duration) func(context.Context, string) (net.Conn, error) {
   123  	return func(ctx context.Context, addr string) (net.Conn, error) {
   124  		return net.DialTimeout(socket, address, timeoutVal)
   125  	}
   126  }