micro/service.go

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package micro
import (
"os"
"os/signal"
rtime "runtime"
"sync"
cmd "github.com/unistack-org/micro-config-cmd"
"github.com/unistack-org/micro/v3/client"
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/server"
signalutil "github.com/unistack-org/micro/v3/util/signal"
)
type service struct {
opts Options
once sync.Once
}
func newService(opts ...Option) Service {
service := &service{}
options := newOptions(opts...)
// set opts
service.opts = options
return service
}
func (s *service) Name() string {
return s.opts.Server.Options().Name
}
// Init initialises options. Additionally it calls cmd.Init
// which parses command line flags. cmd.Init is only called
// on first Init.
func (s *service) Init(opts ...Option) {
// process options
for _, o := range opts {
o(&s.opts)
}
s.once.Do(func() {
if s.opts.Cmd != nil {
// set cmd name
if len(s.opts.Cmd.App().Name) == 0 {
s.opts.Cmd.App().Name = s.Server().Options().Name
}
// Initialise the command options
if err := s.opts.Cmd.Init(
cmd.Auth(&s.opts.Auth),
cmd.Broker(&s.opts.Broker),
cmd.Registry(&s.opts.Registry),
cmd.Runtime(&s.opts.Runtime),
cmd.Transport(&s.opts.Transport),
cmd.Client(&s.opts.Client),
cmd.Config(&s.opts.Config),
cmd.Server(&s.opts.Server),
cmd.Store(&s.opts.Store),
cmd.Profile(&s.opts.Profile),
); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
})
if s.opts.Registry != nil {
if err := s.opts.Registry.Init(); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
if s.opts.Broker != nil {
if err := s.opts.Broker.Init(); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
if s.opts.Transport != nil {
if err := s.opts.Transport.Init(); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
if s.opts.Store != nil {
if err := s.opts.Store.Init(s.opts.Context); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
if s.opts.Server != nil {
if err := s.opts.Server.Init(); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
if s.opts.Client != nil {
if err := s.opts.Client.Init(); err != nil {
logger.Fatalf("[cmd] init failed: %v", err)
}
}
// execute the command
// TODO: do this in service.Run()
if err := s.opts.Cmd.Run(); err != nil {
logger.Fatalf("[cmd] run failed: %v", err)
}
}
func (s *service) Options() Options {
return s.opts
}
func (s *service) Client() client.Client {
return s.opts.Client
}
func (s *service) Server() server.Server {
return s.opts.Server
}
func (s *service) String() string {
return "micro"
}
func (s *service) Start() error {
var err error
for _, fn := range s.opts.BeforeStart {
if err = fn(); err != nil {
return err
}
}
if err = s.opts.Server.Start(); err != nil {
return err
}
for _, fn := range s.opts.AfterStart {
if err = fn(); err != nil {
return err
}
}
return nil
}
func (s *service) Stop() error {
var err error
for _, fn := range s.opts.BeforeStop {
if err = fn(); err != nil {
return err
}
}
if err = s.opts.Server.Stop(); err != nil {
return err
}
for _, fn := range s.opts.AfterStop {
if err = fn(); err != nil {
return err
}
}
return nil
}
func (s *service) Run() error {
// start the profiler
if s.opts.Profile != nil {
// to view mutex contention
rtime.SetMutexProfileFraction(5)
// to view blocking profile
rtime.SetBlockProfileRate(1)
if err := s.opts.Profile.Start(); err != nil {
return err
}
defer s.opts.Profile.Stop()
}
if logger.V(logger.InfoLevel) {
logger.Infof("Starting [service] %s", s.Name())
}
if err := s.Start(); err != nil {
return err
}
ch := make(chan os.Signal, 1)
if s.opts.Signal {
signal.Notify(ch, signalutil.Shutdown()...)
}
select {
// wait on kill signal
case <-ch:
// wait on context cancel
case <-s.opts.Context.Done():
}
return s.Stop()
}