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// Copyright (c) 2020 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.
// multi-vpp is an example of managing multiple VPPs in single application.
package main
import (
"flag"
"fmt"
"log"
"os"
"git.fd.io/govpp.git"
"git.fd.io/govpp.git/adapter/socketclient"
"git.fd.io/govpp.git/api"
interfaces "git.fd.io/govpp.git/binapi/interface"
"git.fd.io/govpp.git/binapi/interface_types"
"git.fd.io/govpp.git/binapi/ip"
"git.fd.io/govpp.git/binapi/ip_types"
"git.fd.io/govpp.git/binapi/vpe"
"git.fd.io/govpp.git/core"
)
var (
sockAddrVpp1 = flag.String("sock1", socketclient.DefaultSocketName, "Path to binary API socket file of the first VPP instance")
sockAddrVpp2 = flag.String("sock2", socketclient.DefaultSocketName, "Path to binary API socket file of the second VPP instance")
)
func main() {
flag.Parse()
fmt.Println("Starting multi-vpp example")
// since both of them default to the same value
if *sockAddrVpp1 == *sockAddrVpp2 {
log.Fatalln("ERROR: identical VPP sockets defined, set at least one of them to non-default path")
}
// connect VPP1
conn1, err := connectToVPP(*sockAddrVpp1, 1)
if err != nil {
log.Fatalf("ERROR: connecting VPP failed (socket %s): %v\n", *sockAddrVpp1, err)
}
defer conn1.Disconnect()
ch1, err := getAPIChannel(conn1)
if err != nil {
log.Fatalf("ERROR: creating channel failed (socket: %s): %v\n", *sockAddrVpp1, err)
}
defer ch1.Close()
// connect VPP2
conn2, err := connectToVPP(*sockAddrVpp2, 2)
if err != nil {
log.Fatalf("ERROR: connecting VPP failed (socket %s): %v\n", *sockAddrVpp2, err)
}
defer conn2.Disconnect()
ch2, err := getAPIChannel(conn2)
if err != nil {
log.Fatalf("ERROR: creating channel failed (socket: %s): %v\n", *sockAddrVpp2, err)
}
defer ch2.Close()
// configure VPPs
ifIdx1 := createLoopback(ch1)
addIPToInterface(ch1, ifIdx1, "10.10.0.1/24")
ifIdx2 := createLoopback(ch2)
addIPToInterface(ch2, ifIdx2, "20.10.0.1/24")
// retrieve configuration from the VPPs
retrieveIPAddresses(ch1, ifIdx1)
retrieveIPAddresses(ch2, ifIdx2)
if len(Errors) > 0 {
fmt.Printf("finished with %d errors\n", len(Errors))
os.Exit(1)
} else {
fmt.Println("finished successfully")
}
}
func connectToVPP(socket string, attempts int) (*core.Connection, error) {
connection, event, err := govpp.AsyncConnect(socket, attempts, core.DefaultReconnectInterval)
if err != nil {
return nil, err
}
// handle connection event
select {
case e := <-event:
if e.State != core.Connected {
return nil, err
}
}
return connection, nil
}
func getAPIChannel(conn *core.Connection) (api.Channel, error) {
ch, err := conn.NewAPIChannel()
if err != nil {
return nil, err
}
if err := ch.CheckCompatiblity(vpe.AllMessages()...); err != nil {
return nil, err
}
getVppVersion(ch)
if err := ch.CheckCompatiblity(interfaces.AllMessages()...); err != nil {
return nil, err
}
return ch, nil
}
// getVppVersion returns VPP version (simple API usage)
func getVppVersion(ch api.Channel) {
fmt.Println("Retrieving version")
req := &vpe.ShowVersion{}
reply := &vpe.ShowVersionReply{}
if err := ch.SendRequest(req).ReceiveReply(reply); err != nil {
logError(err, "retrieving version")
return
}
fmt.Printf("reply: %+v\n", reply)
fmt.Printf("VPP version: %q\n", reply.Version)
fmt.Println("OK")
fmt.Println()
}
var Errors []error
func logError(err error, msg string) {
fmt.Printf("ERROR: %s: %v\n", msg, err)
Errors = append(Errors, err)
}
// createLoopback sends request to create a loopback interface
func createLoopback(ch api.Channel) interface_types.InterfaceIndex {
fmt.Println("Adding loopback interface")
req := &interfaces.CreateLoopback{}
reply := &interfaces.CreateLoopbackReply{}
if err := ch.SendRequest(req).ReceiveReply(reply); err != nil {
logError(err, "adding loopback interface")
return 0
}
fmt.Printf("reply: %+v\n", reply)
fmt.Printf("interface index: %v\n", reply.SwIfIndex)
fmt.Println("OK")
fmt.Println()
return reply.SwIfIndex
}
// addIPToInterface sends request to add an IP address to an interface.
func addIPToInterface(ch api.Channel, index interface_types.InterfaceIndex, ip string) {
fmt.Printf("Setting up IP address to the interface with index %d\n", index)
prefix, err := ip_types.ParsePrefix(ip)
if err != nil {
logError(err, "attempt to add invalid IP address")
return
}
req := &interfaces.SwInterfaceAddDelAddress{
SwIfIndex: index,
IsAdd: true,
Prefix: ip_types.AddressWithPrefix(prefix),
}
reply := &interfaces.SwInterfaceAddDelAddressReply{}
if err := ch.SendRequest(req).ReceiveReply(reply); err != nil {
logError(err, "adding IP address to interface")
return
}
fmt.Printf("reply: %+v\n", reply)
fmt.Println("OK")
fmt.Println()
}
func retrieveIPAddresses(ch api.Channel, index interface_types.InterfaceIndex) {
fmt.Printf("Retrieving IP addresses for interface index %d\n", index)
req := &ip.IPAddressDump{
SwIfIndex: index,
}
reqCtx := ch.SendMultiRequest(req)
for {
msg := &ip.IPAddressDetails{}
stop, err := reqCtx.ReceiveReply(msg)
if err != nil {
logError(err, "dumping IP addresses")
return
}
if stop {
break
}
prefix := ip_types.Prefix(msg.Prefix)
fmt.Printf(" - ip address: %v\n", prefix)
}
fmt.Println("OK")
fmt.Println()
}
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