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//
// Copyright (C) 2014-2017 Nippon Telegraph and Telephone Corporation.
//
// 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.
package main
import (
"fmt"
"io/ioutil"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"runtime"
"syscall"
"github.com/coreos/go-systemd/daemon"
"github.com/jessevdk/go-flags"
"github.com/kr/pretty"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
api "github.com/osrg/gobgp/api"
"github.com/osrg/gobgp/internal/pkg/version"
"github.com/osrg/gobgp/pkg/config"
"github.com/osrg/gobgp/pkg/server"
)
func main() {
sigCh := make(chan os.Signal, 1)
signal.Notify(sigCh, syscall.SIGTERM)
var opts struct {
ConfigFile string `short:"f" long:"config-file" description:"specifying a config file"`
ConfigType string `short:"t" long:"config-type" description:"specifying config type (toml, yaml, json)" default:"toml"`
LogLevel string `short:"l" long:"log-level" description:"specifying log level"`
LogPlain bool `short:"p" long:"log-plain" description:"use plain format for logging (json by default)"`
UseSyslog string `short:"s" long:"syslog" description:"use syslogd"`
Facility string `long:"syslog-facility" description:"specify syslog facility"`
DisableStdlog bool `long:"disable-stdlog" description:"disable standard logging"`
CPUs int `long:"cpus" description:"specify the number of CPUs to be used"`
GrpcHosts string `long:"api-hosts" description:"specify the hosts that gobgpd listens on" default:":50051"`
GracefulRestart bool `short:"r" long:"graceful-restart" description:"flag restart-state in graceful-restart capability"`
Dry bool `short:"d" long:"dry-run" description:"check configuration"`
PProfHost string `long:"pprof-host" description:"specify the host that gobgpd listens on for pprof" default:"localhost:6060"`
PProfDisable bool `long:"pprof-disable" description:"disable pprof profiling"`
UseSdNotify bool `long:"sdnotify" description:"use sd_notify protocol"`
TLS bool `long:"tls" description:"enable TLS authentication for gRPC API"`
TLSCertFile string `long:"tls-cert-file" description:"The TLS cert file"`
TLSKeyFile string `long:"tls-key-file" description:"The TLS key file"`
Version bool `long:"version" description:"show version number"`
}
_, err := flags.Parse(&opts)
if err != nil {
os.Exit(1)
}
if opts.Version {
fmt.Println("gobgpd version", version.Version())
os.Exit(0)
}
if opts.CPUs == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
} else {
if runtime.NumCPU() < opts.CPUs {
log.Errorf("Only %d CPUs are available but %d is specified", runtime.NumCPU(), opts.CPUs)
os.Exit(1)
}
runtime.GOMAXPROCS(opts.CPUs)
}
if !opts.PProfDisable {
go func() {
log.Println(http.ListenAndServe(opts.PProfHost, nil))
}()
}
switch opts.LogLevel {
case "debug":
log.SetLevel(log.DebugLevel)
case "info":
log.SetLevel(log.InfoLevel)
default:
log.SetLevel(log.InfoLevel)
}
if opts.DisableStdlog {
log.SetOutput(ioutil.Discard)
} else {
log.SetOutput(os.Stdout)
}
if opts.UseSyslog != "" {
if err := addSyslogHook(opts.UseSyslog, opts.Facility); err != nil {
log.Error("Unable to connect to syslog daemon, ", opts.UseSyslog)
}
}
if opts.LogPlain {
if opts.DisableStdlog {
log.SetFormatter(&log.TextFormatter{
DisableColors: true,
})
}
} else {
log.SetFormatter(&log.JSONFormatter{})
}
if opts.Dry {
c, err := config.ReadConfigFile(opts.ConfigFile, opts.ConfigType)
if err != nil {
log.WithFields(log.Fields{
"Topic": "Config",
"Error": err,
}).Fatalf("Can't read config file %s", opts.ConfigFile)
}
log.WithFields(log.Fields{
"Topic": "Config",
}).Info("Finished reading the config file")
if opts.LogLevel == "debug" {
pretty.Println(c)
}
os.Exit(0)
}
maxSize := 256 << 20
grpcOpts := []grpc.ServerOption{grpc.MaxRecvMsgSize(maxSize), grpc.MaxSendMsgSize(maxSize)}
if opts.TLS {
creds, err := credentials.NewServerTLSFromFile(opts.TLSCertFile, opts.TLSKeyFile)
if err != nil {
log.Fatalf("Failed to generate credentials: %v", err)
}
grpcOpts = append(grpcOpts, grpc.Creds(creds))
}
log.Info("gobgpd started")
bgpServer := server.NewBgpServer(server.GrpcListenAddress(opts.GrpcHosts), server.GrpcOption(grpcOpts))
go bgpServer.Serve()
if opts.UseSdNotify {
if status, err := daemon.SdNotify(false, daemon.SdNotifyReady); !status {
if err != nil {
log.Warnf("Failed to send notification via sd_notify(): %s", err)
} else {
log.Warnf("The socket sd_notify() isn't available")
}
}
}
if opts.ConfigFile == "" {
<-sigCh
stopServer(bgpServer, opts.UseSdNotify)
return
}
configCh := config.ReadConfigFileOnSighup(opts.ConfigFile, opts.ConfigType)
loop := func() {
initialConfig := <-configCh
c := config.ApplyInitialConfig(bgpServer, initialConfig, opts.GracefulRestart)
for {
select {
case <-sigCh:
stopServer(bgpServer, opts.UseSdNotify)
return
case newConfig := <-configCh:
c = config.UpdateConfig(bgpServer, c, newConfig)
}
}
}
loop()
}
func stopServer(bgpServer *server.BgpServer, useSdNotify bool) {
bgpServer.StopBgp(context.Background(), &api.StopBgpRequest{})
if useSdNotify {
daemon.SdNotify(false, daemon.SdNotifyStopping)
}
}
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