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package rpc
import (
"errors"
"github.com/spiral/goridge"
"github.com/spiral/roadrunner/service"
"net/rpc"
)
// Service is RPC service.
type Service struct {
cfg *config
stop chan interface{}
rpc *rpc.Server
}
// WithConfig must return Service instance configured with the given environment. Must return error in case of
// misconfiguration, might return nil as Service if Service is not enabled.
func (s *Service) WithConfig(cfg service.Config, reg service.Registry) (service.Service, error) {
config := &config{}
if err := cfg.Unmarshal(config); err != nil {
return nil, err
}
if !config.Enable {
return nil, nil
}
return &Service{cfg: config, rpc: rpc.NewServer()}, nil
}
// Serve serves Service.
func (s *Service) Serve() error {
if s.rpc == nil {
return errors.New("RPC service is not configured")
}
s.stop = make(chan interface{})
ln, err := s.cfg.listener()
if err != nil {
return err
}
defer ln.Close()
for {
select {
case <-s.stop:
return nil
default:
conn, err := ln.Accept()
if err != nil {
continue
}
s.rpc.Accept(ln)
go s.rpc.ServeCodec(goridge.NewCodec(conn))
}
}
return nil
}
// Close stop Service Service.
func (s *Service) Stop() error {
close(s.stop)
return nil
}
// Register publishes in the server the set of methods of the
// receiver value that satisfy the following conditions:
// - exported method of exported type
// - two arguments, both of exported type
// - the second argument is a pointer
// - one return value, of type error
// It returns an error if the receiver is not an exported type or has
// no suitable methods. It also logs the error using package log.
func (s *Service) Register(name string, rcvr interface{}) error {
if s.rpc == nil {
return errors.New("RPC service is not configured")
}
return s.rpc.RegisterName(name, rcvr)
}
// Client creates new RPC client.
func (s *Service) Client() (*rpc.Client, error) {
if s.cfg == nil {
return nil, errors.New("RPC service is not configured")
}
conn, err := s.cfg.dialer()
if err != nil {
return nil, err
}
return rpc.NewClientWithCodec(goridge.NewClientCodec(conn)), nil
}
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