micro/service/grpc/grpc.go
2020-07-11 21:15:59 +01:00

130 lines
2.4 KiB
Go

package grpc
import (
"github.com/micro/go-micro/v2/client"
gclient "github.com/micro/go-micro/v2/client/grpc"
"github.com/micro/go-micro/v2/model"
"github.com/micro/go-micro/v2/server"
gserver "github.com/micro/go-micro/v2/server/grpc"
"github.com/micro/go-micro/v2/service"
)
type grpcService struct {
opts service.Options
}
func newService(opts ...service.Option) service.Service {
options := service.NewOptions(opts...)
return &grpcService{
opts: options,
}
}
func (s *grpcService) 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 *grpcService) Init(opts ...service.Option) {
// process options
for _, o := range opts {
o(&s.opts)
}
}
func (s *grpcService) Options() service.Options {
return s.opts
}
func (s *grpcService) Client() client.Client {
return s.opts.Client
}
func (s *grpcService) Server() server.Server {
return s.opts.Server
}
func (s *grpcService) Model() model.Model {
return s.opts.Model
}
func (s *grpcService) String() string {
return "grpc"
}
func (s *grpcService) 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 *grpcService) 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 *grpcService) Run() error {
if err := s.Start(); err != nil {
return err
}
// wait on context cancel
<-s.opts.Context.Done()
return s.Stop()
}
// NewService returns a grpc service compatible with go-micro.Service
func NewService(opts ...service.Option) service.Service {
// our grpc client
c := gclient.NewClient()
// our grpc server
s := gserver.NewServer()
// create options with priority for our opts
options := []service.Option{
service.Client(c),
service.Server(s),
}
// append passed in opts
options = append(options, opts...)
// generate and return a service
return newService(options...)
}