82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
|
package sockets
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"net"
|
||
|
|
"sync"
|
||
|
|
)
|
||
|
|
|
||
|
|
var errClosed = errors.New("use of closed network connection")
|
||
|
|
|
||
|
|
// InmemSocket implements net.Listener using in-memory only connections.
|
||
|
|
type InmemSocket struct {
|
||
|
|
chConn chan net.Conn
|
||
|
|
chClose chan struct{}
|
||
|
|
addr string
|
||
|
|
mu sync.Mutex
|
||
|
|
}
|
||
|
|
|
||
|
|
// dummyAddr is used to satisfy net.Addr for the in-mem socket
|
||
|
|
// it is just stored as a string and returns the string for all calls
|
||
|
|
type dummyAddr string
|
||
|
|
|
||
|
|
// NewInmemSocket creates an in-memory only net.Listener
|
||
|
|
// The addr argument can be any string, but is used to satisfy the `Addr()` part
|
||
|
|
// of the net.Listener interface
|
||
|
|
func NewInmemSocket(addr string, bufSize int) *InmemSocket {
|
||
|
|
return &InmemSocket{
|
||
|
|
chConn: make(chan net.Conn, bufSize),
|
||
|
|
chClose: make(chan struct{}),
|
||
|
|
addr: addr,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Addr returns the socket's addr string to satisfy net.Listener
|
||
|
|
func (s *InmemSocket) Addr() net.Addr {
|
||
|
|
return dummyAddr(s.addr)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Accept implements the Accept method in the Listener interface; it waits for the next call and returns a generic Conn.
|
||
|
|
func (s *InmemSocket) Accept() (net.Conn, error) {
|
||
|
|
select {
|
||
|
|
case conn := <-s.chConn:
|
||
|
|
return conn, nil
|
||
|
|
case <-s.chClose:
|
||
|
|
return nil, errClosed
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Close closes the listener. It will be unavailable for use once closed.
|
||
|
|
func (s *InmemSocket) Close() error {
|
||
|
|
s.mu.Lock()
|
||
|
|
defer s.mu.Unlock()
|
||
|
|
select {
|
||
|
|
case <-s.chClose:
|
||
|
|
default:
|
||
|
|
close(s.chClose)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Dial is used to establish a connection with the in-mem server
|
||
|
|
func (s *InmemSocket) Dial(network, addr string) (net.Conn, error) {
|
||
|
|
srvConn, clientConn := net.Pipe()
|
||
|
|
select {
|
||
|
|
case s.chConn <- srvConn:
|
||
|
|
case <-s.chClose:
|
||
|
|
return nil, errClosed
|
||
|
|
}
|
||
|
|
|
||
|
|
return clientConn, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Network returns the addr string, satisfies net.Addr
|
||
|
|
func (a dummyAddr) Network() string {
|
||
|
|
return string(a)
|
||
|
|
}
|
||
|
|
|
||
|
|
// String returns the string form
|
||
|
|
func (a dummyAddr) String() string {
|
||
|
|
return string(a)
|
||
|
|
}
|