forked from coreos/fleet
/
fleet.go
178 lines (141 loc) · 4.3 KB
/
fleet.go
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package main
import (
"flag"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"github.com/coreos/fleet/third_party/github.com/coreos/go-etcd/etcd"
"github.com/coreos/fleet/third_party/github.com/golang/glog"
"github.com/coreos/fleet/third_party/github.com/rakyll/globalconf"
"github.com/coreos/fleet/agent"
"github.com/coreos/fleet/config"
"github.com/coreos/fleet/server"
"github.com/coreos/fleet/version"
)
func main() {
// We use a FlagSets since glog adds a bunch of flags we do not want to publish
userset := flag.NewFlagSet("fleet", flag.ExitOnError)
printVersion := userset.Bool("version", false, "Print the version and exit")
cfgPath := userset.String("config", "/etc/fleet/fleet.conf", "Path to config file")
err := userset.Parse(os.Args[1:])
if err == flag.ErrHelp {
userset.Usage()
syscall.Exit(1)
}
if *printVersion {
fmt.Println("fleet version", version.Version)
os.Exit(0)
}
cfgset := flag.NewFlagSet("fleet", flag.ExitOnError)
cfgset.Int("verbosity", 0, "Logging level")
cfgset.Var(&stringSlice{}, "etcd_servers", "List of etcd endpoints")
cfgset.String("boot_id", "", "Override default BootID of fleet machine")
cfgset.String("public_ip", "", "IP address that fleet machine should publish")
cfgset.String("metadata", "", "List of key-value metadata to assign to the fleet machine")
cfgset.String("unit_prefix", "", "Prefix that should be used for all systemd units")
cfgset.String("agent_ttl", agent.DefaultTTL, "TTL in seconds of fleet machine state in etcd")
globalconf.Register("", cfgset)
cfg, err := getConfig(cfgset, *cfgPath)
if err != nil {
glog.Error(err.Error())
syscall.Exit(1)
}
config.UpdateLoggingFlagsFromConfig(cfg)
etcd.SetLogger(etcdLogger{})
srv := server.New(*cfg)
srv.Run()
reconfigure := func() {
glog.Infof("Reloading configuration from %s", *cfgPath)
cfg, err := getConfig(cfgset, *cfgPath)
if err != nil {
glog.Errorf(err.Error())
syscall.Exit(1)
}
srv.Stop()
config.UpdateLoggingFlagsFromConfig(cfg)
srv = server.New(*cfg)
srv.Run()
}
shutdown := func() {
glog.Infof("Gracefully shutting down")
srv.Stop()
srv.Purge()
syscall.Exit(0)
}
signals := map[os.Signal]func(){
syscall.SIGHUP: reconfigure,
syscall.SIGTERM: shutdown,
syscall.SIGINT: shutdown,
}
listenForSignals(signals)
}
func getConfig(flagset *flag.FlagSet, file string) (*config.Config, error) {
if _, err := os.Stat(file); err != nil {
glog.Infof("Config file %s does not appear to exist - ignoring")
file = ""
}
opts := globalconf.Options{
EnvPrefix: "FLEET_",
ConfigFile: file,
}
gconf, err := globalconf.NewWithOptions(opts)
if err != nil {
return nil, err
}
gconf.ParseSet("", flagset)
cfg := config.NewConfig()
cfg.Verbosity = (*flagset.Lookup("verbosity")).Value.(flag.Getter).Get().(int)
cfg.EtcdServers = (*flagset.Lookup("etcd_servers")).Value.(flag.Getter).Get().(stringSlice)
cfg.BootId = (*flagset.Lookup("boot_id")).Value.(flag.Getter).Get().(string)
cfg.PublicIP = (*flagset.Lookup("public_ip")).Value.(flag.Getter).Get().(string)
cfg.RawMetadata = (*flagset.Lookup("metadata")).Value.(flag.Getter).Get().(string)
cfg.UnitPrefix = (*flagset.Lookup("unit_prefix")).Value.(flag.Getter).Get().(string)
cfg.AgentTTL = (*flagset.Lookup("agent_ttl")).Value.(flag.Getter).Get().(string)
return cfg, nil
}
func listenForSignals(sigmap map[os.Signal]func()) {
sigchan := make(chan os.Signal, 1)
for k, _ := range sigmap {
signal.Notify(sigchan, k)
}
for true {
sig := <-sigchan
handler, ok := sigmap[sig]
if ok {
handler()
}
}
}
type etcdLogger struct{}
func (el etcdLogger) Debug(args ...interface{}) {
glog.V(3).Info(args...)
}
func (el etcdLogger) Debugf(fmt string, args ...interface{}) {
glog.V(3).Infof(fmt, args...)
}
func (el etcdLogger) Warning(args ...interface{}) {
glog.Warning(args...)
}
func (el etcdLogger) Warningf(fmt string, args ...interface{}) {
glog.Warningf(fmt, args...)
}
type stringSlice []string
func (f *stringSlice) Set(value string) error {
for _, item := range strings.Split(value, ",") {
item = strings.TrimLeft(item, " [\"")
item = strings.TrimRight(item, " \"]")
*f = append(*f, item)
}
return nil
}
func (f *stringSlice) String() string {
return fmt.Sprintf("%v", *f)
}
func (f *stringSlice) Value() []string {
return *f
}
func (f *stringSlice) Get() interface{} {
return *f
}