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# GoBGP as a Go Native BGP library
This page explains how to use GoBGP as a Go Native BGP library.
## Contents
- [Basic Example](#basic-example)
## Basic Example
```go
package main
import (
"context"
"time"
"github.com/sirupsen/logrus"
apb "google.golang.org/protobuf/types/known/anypb"
api "github.com/osrg/gobgp/v3/api"
"github.com/osrg/gobgp/v3/pkg/log"
"github.com/osrg/gobgp/v3/pkg/server"
)
func main() {
log := logrus.New()
s := server.NewBgpServer(server.LoggerOption(&myLogger{logger: log}))
go s.Serve()
// global configuration
if err := s.StartBgp(context.Background(), &api.StartBgpRequest{
Global: &api.Global{
Asn: 65003,
RouterId: "10.0.255.254",
ListenPort: -1, // gobgp won't listen on tcp:179
},
}); err != nil {
log.Fatal(err)
}
// monitor the change of the peer state
if err := s.WatchEvent(context.Background(), &api.WatchEventRequest{Peer: &api.WatchEventRequest_Peer{},}, func(r *api.WatchEventResponse) {
if p := r.GetPeer(); p != nil && p.Type == api.WatchEventResponse_PeerEvent_STATE {
log.Info(p)
}
}); err != nil {
log.Fatal(err)
}
// neighbor configuration
n := &api.Peer{
Conf: &api.PeerConf{
NeighborAddress: "172.17.0.2",
PeerAsn: 65002,
},
}
if err := s.AddPeer(context.Background(), &api.AddPeerRequest{
Peer: n,
}); err != nil {
log.Fatal(err)
}
// add routes
nlri, _ := apb.New(&api.IPAddressPrefix{
Prefix: "10.0.0.0",
PrefixLen: 24,
})
a1, _ := apb.New(&api.OriginAttribute{
Origin: 0,
})
a2, _ := apb.New(&api.NextHopAttribute{
NextHop: "10.0.0.1",
})
a3, _ := apb.New(&api.AsPathAttribute{
Segments: []*api.AsSegment{
{
Type: 2,
Numbers: []uint32{6762, 39919, 65000, 35753, 65000},
},
},
})
attrs := []*apb.Any{a1, a2, a3}
_, err := s.AddPath(context.Background(), &api.AddPathRequest{
Path: &api.Path{
Family: &api.Family{Afi: api.Family_AFI_IP, Safi: api.Family_SAFI_UNICAST},
Nlri: nlri,
Pattrs: attrs,
},
})
if err != nil {
log.Fatal(err)
}
v6Family := &api.Family{
Afi: api.Family_AFI_IP6,
Safi: api.Family_SAFI_UNICAST,
}
// add v6 route
nlri, _ = apb.New(&api.IPAddressPrefix{
PrefixLen: 64,
Prefix: "2001:db8:1::",
})
v6Attrs, _ := apb.New(&api.MpReachNLRIAttribute{
Family: v6Family,
NextHops: []string{"2001:db8::1"},
Nlris: []*apb.Any{nlri},
})
c, _ := apb.New(&api.CommunitiesAttribute{
Communities: []uint32{100, 200},
})
_, err = s.AddPath(context.Background(), &api.AddPathRequest{
Path: &api.Path{
Family: v6Family,
Nlri: nlri,
Pattrs: []*apb.Any{a1, v6Attrs, c},
},
})
if err != nil {
log.Fatal(err)
}
s.ListPath(context.Background(), &api.ListPathRequest{Family: v6Family}, func(p *api.Destination) {
log.Info(p)
})
// do something useful here instead of exiting
time.Sleep(time.Minute * 3)
}
// implement github.com/osrg/gobgp/v3/pkg/log/Logger interface
type myLogger struct {
logger *logrus.Logger
}
func (l *myLogger) Panic(msg string, fields log.Fields) {
l.logger.WithFields(logrus.Fields(fields)).Panic(msg)
}
func (l *myLogger) Fatal(msg string, fields log.Fields) {
l.logger.WithFields(logrus.Fields(fields)).Fatal(msg)
}
func (l *myLogger) Error(msg string, fields log.Fields) {
l.logger.WithFields(logrus.Fields(fields)).Error(msg)
}
func (l *myLogger) Warn(msg string, fields log.Fields) {
l.logger.WithFields(logrus.Fields(fields)).Warn(msg)
}
func (l *myLogger) Info(msg string, fields log.Fields) {
l.logger.WithFields(logrus.Fields(fields)).Info(msg)
}
func (l *myLogger) Debug(msg string, fields log.Fields) {
l.logger.WithFields(logrus.Fields(fields)).Debug(msg)
}
func (l *myLogger) SetLevel(level log.LogLevel) {
l.logger.SetLevel(logrus.Level(level))
}
func (l *myLogger) GetLevel() log.LogLevel {
return log.LogLevel(l.logger.GetLevel())
}
```
|
