micro/service.go
2017-04-17 14:57:43 +01:00

181 lines
2.9 KiB
Go

package micro
import (
"os"
"os/signal"
"syscall"
"time"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/cmd"
"github.com/micro/go-micro/metadata"
"github.com/micro/go-micro/server"
)
type service struct {
opts Options
init chan bool
}
func newService(opts ...Option) Service {
options := newOptions(opts...)
options.Client = &clientWrapper{
options.Client,
metadata.Metadata{
HeaderPrefix + "From-Service": options.Server.Options().Name,
},
}
return &service{
opts: options,
init: make(chan bool),
}
}
func (s *service) run(exit chan bool) {
if s.opts.RegisterInterval <= time.Duration(0) {
return
}
t := time.NewTicker(s.opts.RegisterInterval)
for {
select {
case <-t.C:
s.opts.Server.Register()
case <-exit:
t.Stop()
return
}
}
}
// 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) {
// If <-s.init blocks, Init has not been called yet
// so we can call cmd.Init once.
select {
case <-s.init:
// only process options
for _, o := range opts {
o(&s.opts)
}
default:
// close init
close(s.init)
// process options
for _, o := range opts {
o(&s.opts)
}
// Initialise the command flags, overriding new service
s.opts.Cmd.Init(
cmd.Broker(&s.opts.Broker),
cmd.Registry(&s.opts.Registry),
cmd.Transport(&s.opts.Transport),
cmd.Client(&s.opts.Client),
cmd.Server(&s.opts.Server),
)
}
}
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 "go-micro"
}
func (s *service) Start() error {
for _, fn := range s.opts.BeforeStart {
if err := fn(); err != nil {
return err
}
}
if err := s.opts.Server.Start(); err != nil {
return err
}
if err := s.opts.Server.Register(); 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 gerr error
for _, fn := range s.opts.BeforeStop {
if err := fn(); err != nil {
gerr = err
}
}
if err := s.opts.Server.Deregister(); 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 {
gerr = err
}
}
return gerr
}
func (s *service) Run() error {
if err := s.Start(); err != nil {
return err
}
// start reg loop
ex := make(chan bool)
go s.run(ex)
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
select {
// wait on kill signal
case <-ch:
// wait on context cancel
case <-s.opts.Context.Done():
}
// exit reg loop
close(ex)
if err := s.Stop(); err != nil {
return err
}
return nil
}