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listener.go
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listener.go
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package main
import (
"net"
"sync"
)
// SingleConnListener is a net.Listener implementation returning the provided net.Conn.
type SingleConnListener struct {
addr net.Addr
once sync.Once
connCh chan net.Conn
}
// NewSingleConnListener creates a new SingleConnListener instance.
func NewSingleConnListener(conn net.Conn) *SingleConnListener {
listener := &SingleConnListener{
addr: conn.LocalAddr(),
connCh: make(chan net.Conn, 1),
}
listener.connCh <- connCloser{
Conn: conn,
listener: listener,
}
return listener
}
// Accept waits for and returns the next connection to the listener.
func (s *SingleConnListener) Accept() (net.Conn, error) {
conn, ok := <-s.connCh
if !ok {
return nil, ListenerClosedError{}
}
return conn, nil
}
// Close closes the listener.
// Any blocked Accept operations will be unblocked and return errors.
func (s *SingleConnListener) Close() error {
s.once.Do(func() {
close(s.connCh)
})
return nil
}
// Addr returns the listener's network address.
func (s *SingleConnListener) Addr() net.Addr {
return s.addr
}
// ConnListener is a net.Listener implementation returning the provided net.Conn.
type ConnListener struct {
addr net.Addr
once sync.Once
connCh chan net.Conn
}
// NewConnListener creates a new ConnListener instance.
func NewConnListener(addr net.Addr) *ConnListener {
return &ConnListener{
addr: addr,
connCh: make(chan net.Conn),
}
}
// Accept waits for and returns the next connection to the listener.
func (c *ConnListener) Accept() (net.Conn, error) {
conn, ok := <-c.connCh
if !ok {
return nil, ListenerClosedError{}
}
return conn, nil
}
// ServeConn serves the given connection and blocks until it is accepted
// through the Accept method.
func (c *ConnListener) ServeConn(conn net.Conn) {
c.connCh <- conn
}
// Close closes the listener.
// Any blocked Accept operations will be unblocked and return errors.
func (c *ConnListener) Close() error {
c.once.Do(func() {
close(c.connCh)
})
return nil
}
// Addr returns the listener's network address.
func (c *ConnListener) Addr() net.Addr {
return c.addr
}