mirror of https://github.com/k3s-io/k3s
82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
package sockets
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import (
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"errors"
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"net"
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"sync"
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)
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var errClosed = errors.New("use of closed network connection")
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// InmemSocket implements net.Listener using in-memory only connections.
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type InmemSocket struct {
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chConn chan net.Conn
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chClose chan struct{}
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addr string
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mu sync.Mutex
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}
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// dummyAddr is used to satisfy net.Addr for the in-mem socket
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// it is just stored as a string and returns the string for all calls
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type dummyAddr string
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// NewInmemSocket creates an in-memory only net.Listener
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// The addr argument can be any string, but is used to satisfy the `Addr()` part
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// of the net.Listener interface
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func NewInmemSocket(addr string, bufSize int) *InmemSocket {
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return &InmemSocket{
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chConn: make(chan net.Conn, bufSize),
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chClose: make(chan struct{}),
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addr: addr,
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}
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}
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// Addr returns the socket's addr string to satisfy net.Listener
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func (s *InmemSocket) Addr() net.Addr {
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return dummyAddr(s.addr)
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}
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// Accept implements the Accept method in the Listener interface; it waits for the next call and returns a generic Conn.
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func (s *InmemSocket) Accept() (net.Conn, error) {
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select {
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case conn := <-s.chConn:
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return conn, nil
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case <-s.chClose:
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return nil, errClosed
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}
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}
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// Close closes the listener. It will be unavailable for use once closed.
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func (s *InmemSocket) Close() error {
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s.mu.Lock()
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defer s.mu.Unlock()
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select {
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case <-s.chClose:
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default:
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close(s.chClose)
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}
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return nil
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}
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// Dial is used to establish a connection with the in-mem server
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func (s *InmemSocket) Dial(network, addr string) (net.Conn, error) {
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srvConn, clientConn := net.Pipe()
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select {
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case s.chConn <- srvConn:
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case <-s.chClose:
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return nil, errClosed
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}
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return clientConn, nil
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}
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// Network returns the addr string, satisfies net.Addr
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func (a dummyAddr) Network() string {
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return string(a)
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}
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// String returns the string form
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func (a dummyAddr) String() string {
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return string(a)
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}
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