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go-micro/service.go

169 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:
default:
// close init
close(s.init)
// We might get more command flags or the action here
// This is pretty ugly, find a better way
options := newOptions()
options.Cmd = s.opts.Cmd
for _, o := range opts {
o(&options)
}
s.opts.Cmd = options.Cmd
// 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),
)
}
// Update any options to override command flags
for _, o := range opts {
o(&s.opts)
}
}
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
}
return nil
}
func (s *service) Stop() error {
if err := s.opts.Server.Deregister(); err != nil {
return err
}
if err := s.opts.Server.Stop(); err != nil {
return err
}
var gerr error
for _, fn := range s.opts.AfterStop {
if err := fn(); err != nil {
// should we bail if it fails?
// other funcs will not be executed
// seems wrong
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)
<-ch
// exit reg loop
close(ex)
if err := s.Stop(); err != nil {
return err
}
return nil
}