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go-micro/service.go
2019-08-06 17:53:14 +01:00

141 lines
2.4 KiB
Go

package micro
import (
"os"
"os/signal"
"sync"
"syscall"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/config/cmd"
"github.com/micro/go-micro/debug/handler"
"github.com/micro/go-micro/metadata"
"github.com/micro/go-micro/server"
)
type service struct {
opts Options
once sync.Once
}
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 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() {
// 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 "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
}
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.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 {
// register the debug handler
s.opts.Server.Handle(
s.opts.Server.NewHandler(
handler.DefaultHandler,
server.InternalHandler(true),
),
)
if err := s.Start(); err != nil {
return err
}
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGQUIT)
select {
// wait on kill signal
case <-ch:
// wait on context cancel
case <-s.opts.Context.Done():
}
return s.Stop()
}