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package rpc
import (
"errors"
"github.com/spiral/goridge"
"github.com/spiral/roadrunner/service/env"
"net/rpc"
"sync"
)
// ID contains default service name.
const ID = "rpc"
// Service is RPC service.
type Service struct {
cfg *Config
stop chan interface{}
rpc *rpc.Server
mu sync.Mutex
serving bool
}
// Init rpc service. Must return true if service is enabled.
func (s *Service) Init(cfg *Config, env env.Environment) (bool, error) {
if !cfg.Enable {
return false, nil
}
s.cfg = cfg
s.rpc = rpc.NewServer()
if env != nil {
env.SetEnv("RR_RPC", cfg.Listen)
}
return true, nil
}
// Serve serves the service.
func (s *Service) Serve() error {
if s.rpc == nil {
return errors.New("RPC service is not configured")
}
s.mu.Lock()
s.serving = true
s.stop = make(chan interface{})
s.mu.Unlock()
ln, err := s.cfg.Listener()
if err != nil {
return err
}
defer ln.Close()
go func() {
for {
select {
case <-s.stop:
return
default:
conn, err := ln.Accept()
if err != nil {
continue
}
go s.rpc.ServeCodec(goridge.NewCodec(conn))
}
}
}()
<-s.stop
s.mu.Lock()
s.serving = false
s.mu.Unlock()
return nil
}
// Stop stops the service.
func (s *Service) Stop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.serving {
close(s.stop)
}
}
// 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, svc interface{}) error {
if s.rpc == nil {
return errors.New("RPC service is not configured")
}
return s.rpc.RegisterName(name, svc)
}
// 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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