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listener.go
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listener.go
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// ************************************************************************
// Copyright (C) 2022 plgd.dev, s.r.o.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ************************************************************************
package listener
import (
"fmt"
"net"
"github.com/plgd-dev/hub/v2/pkg/fsnotify"
"github.com/plgd-dev/hub/v2/pkg/log"
"github.com/plgd-dev/hub/v2/pkg/net/listener"
)
type Listener interface {
AddCloseFunc(f func())
Close() error
Accept() (net.Conn, error)
Addr() net.Addr
}
// Server handles gRPC requests to the service.
type Server struct {
listener net.Listener
closeFunc []func()
}
// NewServer instantiates a listen server.
// When passing addr with an unspecified port or ":", use Addr().
func New(config Config, fileWatcher *fsnotify.Watcher, logger log.Logger) (Listener, error) {
if config.TLS.Enabled {
return listener.New(listener.Config{
Addr: config.Addr,
TLS: config.TLS.Config,
}, fileWatcher, logger)
}
lis, err := net.Listen("tcp", config.Addr)
if err != nil {
return nil, fmt.Errorf("listening failed: %w", err)
}
return &Server{listener: lis}, nil
}
// AddCloseFunc adds a function to be called by the Close method.
// This eliminates the need for wrapping the Server.
func (s *Server) AddCloseFunc(f func()) {
s.closeFunc = append(s.closeFunc, f)
}
func (s *Server) Close() error {
err := s.listener.Close()
for _, f := range s.closeFunc {
f()
}
return err
}
func (s *Server) Accept() (net.Conn, error) {
return s.listener.Accept()
}
func (s *Server) Addr() net.Addr {
return s.listener.Addr()
}