зеркало из https://github.com/microsoft/docker.git
47 строки
1.1 KiB
Go
47 строки
1.1 KiB
Go
/*
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Package to allow go applications to immediately start
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listening on a socket, unix, tcp, udp but hold connections
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until the application has booted and is ready to accept them
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*/
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package listenbuffer
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import "net"
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// NewListenBuffer returns a listener listening on addr with the protocol.
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func NewListenBuffer(proto, addr string, activate chan struct{}) (net.Listener, error) {
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wrapped, err := net.Listen(proto, addr)
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if err != nil {
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return nil, err
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}
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return &defaultListener{
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wrapped: wrapped,
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activate: activate,
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}, nil
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}
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type defaultListener struct {
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wrapped net.Listener // the real listener to wrap
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ready bool // is the listner ready to start accpeting connections
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activate chan struct{}
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}
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func (l *defaultListener) Close() error {
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return l.wrapped.Close()
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}
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func (l *defaultListener) Addr() net.Addr {
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return l.wrapped.Addr()
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}
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func (l *defaultListener) Accept() (net.Conn, error) {
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// if the listen has been told it is ready then we can go ahead and
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// start returning connections
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if l.ready {
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return l.wrapped.Accept()
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}
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<-l.activate
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l.ready = true
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return l.Accept()
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}
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