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package internal
import (
"context"
"net"
"sync"
)
type logger interface {
Log(keyvals ...any) error
}
type Server struct {
Ctx context.Context
Cancel context.CancelFunc
Wg *sync.WaitGroup
Listener net.Listener
HandleConn connHandler
ErrorLog logger
Host string
NetworkAddr net.Addr
}
type connHandler func(net.Conn)
func NewServer(
ctx context.Context,
hostname string,
network string,
address string,
errorLog logger,
handleConn connHandler,
) (Server, error) {
listener, err := net.Listen(network, address)
if err != nil {
return Server{}, err
}
networkAddr := listener.Addr()
ctx, cancel := context.WithCancel(ctx)
return Server{
Ctx: ctx,
Cancel: cancel,
Wg: &sync.WaitGroup{},
Listener: listener,
HandleConn: handleConn,
ErrorLog: errorLog,
Host: hostname,
NetworkAddr: networkAddr,
}, nil
}
func (s *Server) Serve() error {
s.Wg.Add(1)
defer s.Wg.Done()
s.propagateClose()
for {
conn, err := s.Listener.Accept()
if err != nil {
if s.Closed() {
err = nil
} else {
_ = s.ErrorLog.Log("msg", "accept error", "error", err)
}
return err
}
s.Wg.Add(1)
go func() {
defer s.Wg.Done()
defer func() {
_ = conn.Close()
}()
s.HandleConn(conn)
}()
}
}
func (s *Server) Hostname() string {
host, _, _ := net.SplitHostPort(s.Host)
return host
}
func (s *Server) Port() string {
_, port, _ := net.SplitHostPort(s.Host)
return port
}
func (s *Server) Network() string {
return s.NetworkAddr.Network()
}
func (s *Server) Address() string {
return s.NetworkAddr.String()
}
func (s *Server) Close() {
s.Cancel()
s.Wg.Wait()
}
func (s *Server) LogError(keyvals ...any) error {
return s.ErrorLog.Log(keyvals...)
}
func (s *Server) Closed() bool {
select {
case <-s.Ctx.Done():
return true
default:
return false
}
}
func (s *Server) propagateClose() {
s.Wg.Add(1)
go func() {
defer s.Wg.Done()
<-s.Ctx.Done()
_ = s.Listener.Close()
}()
}
|
