func (s *srv) newTLSConfig() (*tls.Config, error) {
config, err := s.listener.TLSConfig()
if err != nil {
return nil, err
}
if config.NextProtos == nil {
config.NextProtos = []string{"http/1.1"}
}
pairs := map[string]tls.Certificate{}
for _, host := range s.mux.hosts {
c := host.Settings.KeyPair
if c == nil {
continue
}
keyPair, err := tls.X509KeyPair(c.Cert, c.Key)
if err != nil {
return nil, err
}
if host.Settings.OCSP.Enabled {
log.Infof("%v OCSP is enabled for %v, resolvers: %v", s, host, host.Settings.OCSP.Responders)
r, err := s.mux.stapler.StapleHost(&host)
if err != nil {
log.Warningf("%v failed to staple %v, error %v", s, host, err)
} else if r.Response.Status == ocsp.Good || r.Response.Status == ocsp.Revoked {
keyPair.OCSPStaple = r.Staple
} else {
log.Warningf("%s got undefined status from OCSP responder: %v", s, r.Response.Status)
}
}
pairs[host.Name] = keyPair
}
config.Certificates = make([]tls.Certificate, 0, len(pairs))
if s.defaultHost != "" {
keyPair, exists := pairs[s.defaultHost]
if !exists {
return nil, fmt.Errorf("default host '%s' certificate is not passed", s.defaultHost)
}
config.Certificates = append(config.Certificates, keyPair)
}
for h, keyPair := range pairs {
if h != s.defaultHost {
config.Certificates = append(config.Certificates, keyPair)
}
}
config.BuildNameToCertificate()
return config, nil
}
// Subscribe watches etcd changes and generates structured events telling vulcand to add or delete frontends, hosts etc.
// It is a blocking function.
func (n *ng) Subscribe(changes chan interface{}, cancelC chan bool) error {
// This index helps us to get changes in sequence, as they were performed by clients.
waitIndex := uint64(0)
for {
response, err := n.client.Watch(n.etcdKey, waitIndex, true, nil, cancelC)
if err != nil {
switch err {
case etcd.ErrWatchStoppedByUser:
log.Infof("Stop watching: graceful shutdown")
return nil
default:
log.Errorf("unexpected error: %s, stop watching", err)
return err
}
}
waitIndex = response.Node.ModifiedIndex + 1
log.Infof("%s", responseToString(response))
change, err := n.parseChange(response)
if err != nil {
log.Warningf("Ignore '%s', error: %s", responseToString(response), err)
continue
}
if change != nil {
log.Infof("%v", change)
select {
case changes <- change:
case <-cancelC:
return nil
}
}
}
}
func (s *Service) Start() error {
log.InitWithConfig(log.Config{
Name: s.options.Log,
Severity: s.options.LogSeverity.S.String(),
})
log.Infof("Service starts with options: %#v", s.options)
if s.options.PidPath != "" {
ioutil.WriteFile(s.options.PidPath, []byte(fmt.Sprint(os.Getpid())), 0644)
}
if s.options.StatsdAddr != "" {
var err error
s.metricsClient, err = metrics.NewWithOptions(s.options.StatsdAddr, s.options.StatsdPrefix, metrics.Options{UseBuffering: true})
if err != nil {
return err
}
}
apiFile, muxFiles, err := s.getFiles()
if err != nil {
return err
}
if err := s.newEngine(); err != nil {
return err
}
s.stapler = stapler.New()
s.supervisor = supervisor.New(
s.newProxy, s.ng, s.errorC, supervisor.Options{Files: muxFiles})
// Tells configurator to perform initial proxy configuration and start watching changes
if err := s.supervisor.Start(); err != nil {
return err
}
if err := s.initApi(); err != nil {
return err
}
go func() {
s.errorC <- s.startApi(apiFile)
}()
if s.metricsClient != nil {
go s.reportSystemMetrics()
}
signal.Notify(s.sigC, os.Interrupt, os.Kill, syscall.SIGTERM, syscall.SIGUSR2, syscall.SIGCHLD)
// Block until a signal is received or we got an error
for {
select {
case signal := <-s.sigC:
switch signal {
case syscall.SIGTERM, syscall.SIGINT:
log.Infof("Got signal '%s', shutting down gracefully", signal)
s.supervisor.Stop(true)
log.Infof("All servers stopped")
return nil
case syscall.SIGKILL:
log.Infof("Got signal '%s', exiting now without waiting", signal)
s.supervisor.Stop(false)
return nil
case syscall.SIGUSR2:
log.Infof("Got signal '%s', forking a new self", signal)
if err := s.startChild(); err != nil {
log.Infof("Failed to start self: %s", err)
} else {
log.Infof("Successfully started self")
}
case syscall.SIGCHLD:
log.Warningf("Child exited, got '%s', collecting status", signal)
var wait syscall.WaitStatus
syscall.Wait4(-1, &wait, syscall.WNOHANG, nil)
log.Warningf("Collected exit status from child")
default:
log.Infof("Ignoring '%s'", signal)
}
case err := <-s.errorC:
log.Infof("Got request to shutdown with error: %s", err)
return err
}
}
}
// initProxy reads the configuration from the engine and configures the server
func initProxy(ng engine.Engine, p proxy.Proxy) error {
hosts, err := ng.GetHosts()
if err != nil {
return err
}
for _, h := range hosts {
if err := p.UpsertHost(h); err != nil {
return err
}
}
bs, err := ng.GetBackends()
if err != nil {
return err
}
for _, b := range bs {
if err := p.UpsertBackend(b); err != nil {
return err
}
bk := engine.BackendKey{Id: b.Id}
servers, err := ng.GetServers(bk)
if err != nil {
return err
}
for _, s := range servers {
if err := p.UpsertServer(bk, s); err != nil {
return err
}
}
}
ls, err := ng.GetListeners()
if err != nil {
return err
}
for _, l := range ls {
if err := p.UpsertListener(l); err != nil {
return err
}
}
fs, err := ng.GetFrontends()
if err != nil {
return err
}
if len(fs) == 0 {
log.Warningf("No frontends found")
}
for _, f := range fs {
if err := p.UpsertFrontend(f); err != nil {
return err
}
fk := engine.FrontendKey{Id: f.Id}
ms, err := ng.GetMiddlewares(fk)
if err != nil {
return err
}
for _, m := range ms {
if err := p.UpsertMiddleware(fk, m); err != nil {
return err
}
}
}
return nil
}