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server.go
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server.go
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package remote
import (
"context"
"errors"
"net"
"github.com/licaonfee/selina"
"google.golang.org/grpc"
)
var _ WorkerServer = (*Server)(nil)
var _ selina.Worker = (*Server)(nil)
var (
//ErrDiscarded is returned when there is no slots
//in process stream
ErrDiscarded = errors.New("discarded")
)
//ServerOptions customize Server Worker
type ServerOptions struct {
Network string
Address string
BufferSize int
}
//Server receive data from a remote endpoint
type Server struct {
UnimplementedWorkerServer
opts ServerOptions
dataC chan []byte
}
//Send implements grpc service
func (s *Server) Send(ctx context.Context, msg *Message) (*Error, error) {
select {
case <-ctx.Done():
return &Error{Message: ctx.Err().Error()}, ctx.Err()
case s.dataC <- msg.Data:
return &Error{}, nil
}
}
//Push put a []byte into process stream, return ErrDiscarded if
//msg is not send immediately
func (s *Server) Push(msg []byte) error {
select {
case s.dataC <- msg:
return nil
default:
return ErrDiscarded
}
}
//Process implements selina.Worker interface
func (s *Server) Process(ctx context.Context, args selina.ProcessArgs) (errp error) {
defer close(args.Output)
listener, err := net.Listen(s.opts.Network, s.opts.Address)
if err != nil {
return err
}
gserver := grpc.NewServer()
RegisterWorkerServer(gserver, s)
//TODO: handle Server error
go func() {
errp = gserver.Serve(listener)
}()
defer gserver.GracefulStop()
for {
select {
case _, ok := <-args.Input:
if !ok {
return nil
}
case msg := <-s.dataC:
if err := selina.SendContext(ctx, msg, args.Output); err != nil {
return err
}
case <-ctx.Done():
return ctx.Err()
}
}
}
//NewServer create a new grpc server with given options
func NewServer(opts ServerOptions) *Server {
return &Server{opts: opts,
dataC: make(chan []byte, opts.BufferSize)}
}