func main() {
flag.Parse()
if err := flagenv.Populate(flag.CommandLine, "DOORMAN"); err != nil {
log.Exit(err)
}
if *config == "" {
log.Exit("--config cannot be empty")
}
var (
etcdEndpointsSlice = strings.Split(*etcdEndpoints, ",")
masterElection election.Election
)
if *masterElectionLock != "" {
if len(etcdEndpointsSlice) == 1 && etcdEndpointsSlice[0] == "" {
log.Exit("-etcd_endpoints cannot be empty if -master_election_lock is provided")
}
masterElection = election.Etcd(etcdEndpointsSlice, *masterElectionLock, *masterDelay)
} else {
masterElection = election.Trivial()
}
dm, err := doorman.New(context.Background(), getServerID(*port), *parent, masterElection,
connection.MinimumRefreshInterval(*minimumRefreshInterval),
connection.DialOpts(
rpc.WithTimeout(*rpcDialTimeout)))
if err != nil {
log.Exitf("doorman.NewIntermediate: %v", err)
}
var opts []rpc.ServerOption
if *tls {
log.Infof("Loading credentials from %v and %v.", *certFile, *keyFile)
creds, err := credentials.NewServerTLSFromFile(*certFile, *keyFile)
if err != nil {
log.Exitf("Failed to generate credentials %v", err)
}
opts = []rpc.ServerOption{rpc.Creds(creds)}
}
server := rpc.NewServer(opts...)
pb.RegisterCapacityServer(server, dm)
if *config == "" {
log.Exit("-config cannot be empty")
}
var cfg configuration.Source
kind, path := configuration.ParseSource(*config)
switch {
case kind == "file":
cfg = configuration.LocalFile(path)
case kind == "etcd":
if len(etcdEndpointsSlice) == 1 && etcdEndpointsSlice[0] == "" {
log.Exit("-etcd_endpoints cannot be empty if a config source etcd is provided")
}
cfg = configuration.Etcd(path, etcdEndpointsSlice)
default:
panic("unreachable")
}
// Try to load the background. If there's a problem with loading
// the server for the first time, the server will keep running,
// but will not serve traffic.
go func() {
for {
data, err := cfg(context.Background())
if err != nil {
log.Errorf("cannot load config data: %v", err)
continue
}
cfg := new(pb.ResourceRepository)
if err := yaml.Unmarshal(data, cfg); err != nil {
log.Errorf("cannot unmarshal config data: %q", data)
continue
}
if err := dm.LoadConfig(context.Background(), cfg, map[string]*time.Time{}); err != nil {
log.Errorf("cannot load config: %v", err)
}
}
}()
status.AddStatusPart("Doorman", statusz, func(context.Context) interface{} { return dm.Status() })
// Redirect form / to /debug/status.
http.Handle("/", http.RedirectHandler("/debug/status", http.StatusMovedPermanently))
AddServer(dm)
http.Handle("/metrics", prometheus.Handler())
go http.ListenAndServe(fmt.Sprintf(":%v", *debugPort), nil)
// Waits for the server to get its initial configuration. This guarantees that
// the server will never run without a valid configuration.
log.Info("Waiting for the server to be configured...")
dm.WaitUntilConfigured()
// Runs the server.
log.Info("Server is configured, ready to go!")
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
log.Exit(err)
}
server.Serve(lis)
}
// DialOpts sets dial options for the client's connection with the server.
func DialOpts(dialOpts ...rpc.DialOption) Option {
return Option(connection.DialOpts(dialOpts...))
}
// MakeTestIntermediateServer creates a test intermediate server with
// specified name and connected to the lower-level server with address addr.
func MakeTestIntermediateServer(name string, addr string, resources ...*pb.ResourceTemplate) (*Server, error) {
// Creates a new test server that is the master.
server, err := NewIntermediate(context.Background(), name, addr, election.Trivial(), connection.MinimumRefreshInterval(0), connection.DialOpts(grpc.WithInsecure()))
if err != nil {
return nil, fmt.Errorf("server.NewIntermediate: %v", err)
}
// If this is a root server, then it should not be configured until we explicitly call LoadConfig
// with the initial resources configuration. For intermediate server it is not the case.
if addr == "" {
if err := server.LoadConfig(context.Background(), &pb.ResourceRepository{
Resources: resources,
}, map[string]*time.Time{}); err != nil {
return nil, fmt.Errorf("server.LoadConfig: %v", err)
}
}
// Waits until the server is configured. This should not block and immediately fall through.
server.WaitUntilConfigured()
return server, nil
}