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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
import (
"fmt"
"log"
"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/examples/bin_api/stats"
)
func main() {
fmt.Println("Starting stats VPP client..")
// async connect to VPP
conn, statCh, err := govpp.AsyncConnect("")
if err != nil {
log.Fatalln("Error:", err)
}
defer conn.Disconnect()
// create an API channel that will be used in the examples
ch, err := conn.NewAPIChannel()
if err != nil {
log.Fatalln("Error:", err)
}
defer ch.Close()
// create channel for Interrupt signal
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt)
var notifChan chan api.Message
var simpleSub api.SubscriptionCtx
var combinedSub api.SubscriptionCtx
// 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 notifChan == nil {
simpleSub, combinedSub, notifChan = subscribeNotifications(ch)
}
requestStatistics(ch)
case core.Disconnected:
fmt.Println("VPP disconnected.")
}
case msg := <-notifChan:
switch notif := msg.(type) {
case *stats.VnetInterfaceSimpleCounters:
// simple counter notification received
processSimpleCounters(notif)
case *stats.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
}
}
simpleSub.Unsubscribe()
combinedSub.Unsubscribe()
}
// subscribeNotifications subscribes for interface counters notifications.
func subscribeNotifications(ch api.Channel) (api.SubscriptionCtx, api.SubscriptionCtx, chan api.Message) {
notifChan := make(chan api.Message, 100)
simpleSub, err := ch.SubscribeNotification(notifChan, &stats.VnetInterfaceSimpleCounters{})
if err != nil {
panic(err)
}
combinedSub, err := ch.SubscribeNotification(notifChan, &stats.VnetInterfaceCombinedCounters{})
if err != nil {
panic(err)
}
return simpleSub, combinedSub, notifChan
}
// requestStatistics requests interface counters notifications from VPP.
func requestStatistics(ch api.Channel) {
if err := ch.SendRequest(&stats.WantStats{
PID: uint32(os.Getpid()),
EnableDisable: 1,
}).ReceiveReply(&stats.WantStatsReply{}); err != nil {
panic(err)
}
}
// processSimpleCounters processes simple counters received from VPP.
func processSimpleCounters(counters *stats.VnetInterfaceSimpleCounters) {
fmt.Printf("SimpleCounters: %+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 *stats.VnetInterfaceCombinedCounters) {
fmt.Printf("CombinedCounters: %+v\n", counters)
counterNames := []string{"Rx", "Tx"}
for i := uint32(0); i < counters.Count; i++ {
if len(counterNames) <= int(counters.VnetCounterType) {
continue
}
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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