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server.go
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server.go
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package protocols
import (
"flag"
"fmt"
"log"
"net"
"strconv"
"sync"
"time"
"github.com/antongulenko/golib"
)
const (
ErrorChanBuffer = 16
SendTimeout = 1 * time.Second
)
type Server struct {
stopped golib.StopChan
listener Listener
errors chan error
protocol *serverProtocolInstance
Stopped bool
}
func NewServer(addr_string string, protocol Protocol) (*Server, error) {
server := &Server{
errors: make(chan error, ErrorChanBuffer),
stopped: golib.NewStopChan(),
}
var err error
server.protocol, err = protocol.instantiateServer(server)
if err != nil {
return nil, err
}
addr, err := protocol.Transport().Resolve(addr_string)
if err != nil {
return nil, err
}
listener, err := protocol.Transport().Listen(addr, protocol)
if err != nil {
return nil, err
}
server.listener = listener
return server, nil
}
func (server *Server) LocalAddr() Addr {
return server.listener.LocalAddr()
}
func (server *Server) String() string {
return fmt.Sprintf("%v on %v", server.protocol.Name(), server.LocalAddr())
}
func (server *Server) Protocol() Protocol {
return server.protocol
}
func (server *Server) Errors() <-chan error {
return server.errors
}
func (server *Server) Start(wg *sync.WaitGroup) golib.StopChan {
wg.Add(1)
go server.listen(wg)
return server.stopped.Start(wg)
}
func (server *Server) Stop() {
server.stopped.Enable(func() {
server.Stopped = true
if err := server.listener.Close(); err != nil {
server.LogError(fmt.Errorf("Error closing listener: %v", err))
}
server.protocol.stopServer()
})
}
func (server *Server) RegisterHandlers(handlers ServerHandlerMap) error {
return server.protocol.registerHandlers(handlers)
}
func (server *Server) RegisterStopHandler(handler ServerStopper) {
server.protocol.registerStopper(handler)
}
func (server *Server) listen(wg *sync.WaitGroup) {
defer wg.Done()
for !server.Stopped {
conn, err := server.listener.Accept()
if err != nil {
if server.Stopped {
return // error because listener was closed
}
server.LogError(err)
} else {
// TODO separate goroutine for this?
packet, err := conn.Receive(time.Duration(0))
if err != nil {
server.LogError(fmt.Errorf("Error receiving on accepted connection: %v", err))
continue
}
reply := server.protocol.HandleServerPacket(packet)
if reply != nil {
err := conn.Send(reply, SendTimeout) // TODO arbitrary timeout...
if err != nil {
server.LogError(fmt.Errorf("Failed to send reply: %v", err))
}
}
}
}
}
func (server *Server) Reply(code Code, value interface{}) *Packet {
return &Packet{Code: code, Val: value}
}
func (server *Server) ReplyCheck(err error) *Packet {
if err == nil {
return server.ReplyOK()
} else {
return server.ReplyError(err)
}
}
func (server *Server) ReplyOK() *Packet {
return server.Reply(CodeOK, "")
}
func (server *Server) ReplyError(err error) *Packet {
return server.Reply(CodeError, err.Error())
}
func (server *Server) LogError(err error) {
select {
case server.errors <- err:
default:
log.Printf("Warning: dropped server error: %v\n", err)
}
}
func ParseServerFlags(default_ip string, default_port int) string {
port := flag.Int("port", default_port, "The port to start the server")
ip := flag.String("host", default_ip, "The ip to listen for traffic")
flag.Parse()
return net.JoinHostPort(*ip, strconv.Itoa(int(*port)))
}