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server.go
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server.go
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package transport
import (
"context"
"net"
"sync"
"golang.org/x/xerrors"
"github.com/gotd/td/internal/proto/codec"
"github.com/gotd/td/internal/tdsync"
)
// NewCustomServer creates new MTProto server with custom transport codec.
func NewCustomServer(c func() Codec, listener net.Listener) *Server {
return &Server{
codec: c,
listener: &onceCloseListener{Listener: listener},
}
}
// NewFullServer creates new MTProto server with
// Full transport codec.
func NewFullServer(listener net.Listener) *Server {
return NewCustomServer(func() Codec {
return &codec.Full{}
}, listener)
}
// NewIntermediateServer creates new MTProto server with
// Intermediate transport codec.
func NewIntermediateServer(listener net.Listener) *Server {
return NewCustomServer(func() Codec {
return &codec.Intermediate{}
}, listener)
}
// Handler is MTProto server connection handler.
type Handler func(ctx context.Context, conn Conn) error
// Server is a simple MTProto server.
type Server struct {
codec func() Codec
listener net.Listener
serveMux sync.Mutex
serve *tdsync.CancellableGroup
}
func (s *Server) serveConn(ctx context.Context, handler Handler, c net.Conn) error {
transportCodec := s.codec()
if err := transportCodec.ReadHeader(c); err != nil {
return xerrors.Errorf("read header: %w", err)
}
if v, ok := ctx.Deadline(); ok {
if err := c.SetDeadline(v); err != nil {
return xerrors.Errorf("set deadline: %w", err)
}
}
return handler(ctx, &connection{
conn: c,
codec: transportCodec,
})
}
// Addr returns server address.
func (s *Server) Addr() net.Addr {
return s.listener.Addr()
}
// Serve runs server using given listener.
func (s *Server) Serve(serveCtx context.Context, handler Handler) error {
s.serveMux.Lock()
s.serve = tdsync.NewCancellableGroup(serveCtx)
s.serveMux.Unlock()
s.serve.Go(func(ctx context.Context) error {
<-ctx.Done()
_ = s.listener.Close()
return nil
})
s.serve.Go(func(ctx context.Context) error {
for {
conn, err := s.listener.Accept()
if err != nil {
select {
case <-serveCtx.Done():
return serveCtx.Err()
case <-ctx.Done():
// If parent context is not done, so
// serve group context is canceled by Close.
return nil
default:
}
return err
}
s.serve.Go(func(ctx context.Context) error {
return s.serveConn(ctx, handler, conn)
})
}
})
return s.serve.Wait()
}
// Close stops server and closes given listener.
func (s *Server) Close() error {
s.serveMux.Lock()
if s.serve != nil {
s.serve.Cancel()
}
s.serveMux.Unlock()
return s.listener.Close()
}