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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.
// Binary stats-client is an example VPP management application that exercises the
// govpp API for interface counters together with asynchronous connection to VPP.
package main
// Generates Go bindings for all VPP APIs located in the json directory.
//go:generate binapi-generator --input-dir=bin_api --output-dir=bin_api
import (
"fmt"
"os"
"os/signal"
"git.fd.io/govpp.git"
"git.fd.io/govpp.git/api"
"git.fd.io/govpp.git/core"
"git.fd.io/govpp.git/core/bin_api/vpe"
"git.fd.io/govpp.git/examples/bin_api/interfaces"
)
func main() {
fmt.Println("Starting stats VPP client...")
// async connect to VPP
conn, statCh, err := govpp.AsyncConnect()
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
defer conn.Disconnect()
// create an API channel that will be used in the examples
ch, err := conn.NewAPIChannel()
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
defer ch.Close()
// create channel for Interrupt signal
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
var simpleCountersSubs *api.NotifSubscription
var combinedCountersSubs *api.NotifSubscription
var notifChan chan api.Message
// loop until Interrupt signal is received
loop:
for {
select {
case connEvent := <-statCh:
// VPP connection state change
switch connEvent.State {
case core.Connected:
fmt.Println("VPP connected.")
if simpleCountersSubs == nil {
simpleCountersSubs, combinedCountersSubs, notifChan = subscribeNotifications(ch)
}
requestStatistics(ch)
case core.Disconnected:
fmt.Println("VPP disconnected.")
}
case msg := <-notifChan:
switch notif := msg.(type) {
case *interfaces.VnetInterfaceSimpleCounters:
// simple counter notification received
processSimpleCounters(notif)
case *interfaces.VnetInterfaceCombinedCounters:
// combined counter notification received
processCombinedCounters(notif)
default:
fmt.Println("Ignoring unknown VPP notification")
}
case <-sigChan:
// interrupt received
fmt.Println("Interrupt received, exiting.")
break loop
}
}
ch.UnsubscribeNotification(simpleCountersSubs)
ch.UnsubscribeNotification(combinedCountersSubs)
}
// subscribeNotifications subscribes for interface counters notifications.
func subscribeNotifications(ch *api.Channel) (*api.NotifSubscription, *api.NotifSubscription, chan api.Message) {
notifChan := make(chan api.Message, 100)
simpleCountersSubs, _ := ch.SubscribeNotification(notifChan, interfaces.NewVnetInterfaceSimpleCounters)
combinedCountersSubs, _ := ch.SubscribeNotification(notifChan, interfaces.NewVnetInterfaceCombinedCounters)
return simpleCountersSubs, combinedCountersSubs, notifChan
}
// requestStatistics requests interface counters notifications from VPP.
func requestStatistics(ch *api.Channel) {
ch.SendRequest(&vpe.WantStats{
Pid: uint32(os.Getpid()),
EnableDisable: 1,
}).ReceiveReply(&vpe.WantStatsReply{})
}
// processSimpleCounters processes simple counters received from VPP.
func processSimpleCounters(counters *interfaces.VnetInterfaceSimpleCounters) {
fmt.Printf("%+v\n", counters)
counterNames := []string{"Drop", "Punt", "IPv4", "IPv6", "RxNoBuf", "RxMiss", "RxError", "TxError", "MPLS"}
for i := uint32(0); i < counters.Count; i++ {
fmt.Printf("Interface '%d': %s = %d\n",
counters.FirstSwIfIndex+i, counterNames[counters.VnetCounterType], counters.Data[i])
}
}
// processCombinedCounters processes combined counters received from VPP.
func processCombinedCounters(counters *interfaces.VnetInterfaceCombinedCounters) {
fmt.Printf("%+v\n", counters)
counterNames := []string{"Rx", "Tx"}
for i := uint32(0); i < counters.Count; i++ {
fmt.Printf("Interface '%d': %s packets = %d, %s bytes = %d\n",
counters.FirstSwIfIndex+i, counterNames[counters.VnetCounterType], counters.Data[i].Packets,
counterNames[counters.VnetCounterType], counters.Data[i].Bytes)
}
}
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