94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
// +build !windows,!solaris
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package listeners
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import (
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"crypto/tls"
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"fmt"
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"net"
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"strconv"
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"github.com/Sirupsen/logrus"
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"github.com/coreos/go-systemd/activation"
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"github.com/docker/go-connections/sockets"
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)
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// Init creates new listeners for the server.
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// TODO: Clean up the fact that socketGroup and tlsConfig aren't always used.
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func Init(proto, addr, socketGroup string, tlsConfig *tls.Config) ([]net.Listener, error) {
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ls := []net.Listener{}
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switch proto {
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case "fd":
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fds, err := listenFD(addr, tlsConfig)
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if err != nil {
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return nil, err
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}
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ls = append(ls, fds...)
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case "tcp":
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l, err := sockets.NewTCPSocket(addr, tlsConfig)
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if err != nil {
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return nil, err
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}
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ls = append(ls, l)
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case "unix":
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l, err := sockets.NewUnixSocket(addr, socketGroup)
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if err != nil {
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return nil, fmt.Errorf("can't create unix socket %s: %v", addr, err)
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}
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ls = append(ls, l)
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default:
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return nil, fmt.Errorf("invalid protocol format: %q", proto)
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}
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return ls, nil
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}
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// listenFD returns the specified socket activated files as a slice of
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// net.Listeners or all of the activated files if "*" is given.
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func listenFD(addr string, tlsConfig *tls.Config) ([]net.Listener, error) {
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var (
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err error
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listeners []net.Listener
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)
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// socket activation
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if tlsConfig != nil {
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listeners, err = activation.TLSListeners(false, tlsConfig)
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} else {
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listeners, err = activation.Listeners(false)
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}
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if err != nil {
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return nil, err
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}
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if len(listeners) == 0 {
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return nil, fmt.Errorf("no sockets found via socket activation: make sure the service was started by systemd")
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}
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// default to all fds just like unix:// and tcp://
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if addr == "" || addr == "*" {
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return listeners, nil
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}
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fdNum, err := strconv.Atoi(addr)
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if err != nil {
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return nil, fmt.Errorf("failed to parse systemd fd address: should be a number: %v", addr)
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}
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fdOffset := fdNum - 3
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if len(listeners) < int(fdOffset)+1 {
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return nil, fmt.Errorf("too few socket activated files passed in by systemd")
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}
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if listeners[fdOffset] == nil {
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return nil, fmt.Errorf("failed to listen on systemd activated file: fd %d", fdOffset+3)
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}
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for i, ls := range listeners {
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if i == fdOffset || ls == nil {
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continue
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}
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if err := ls.Close(); err != nil {
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// TODO: We shouldn't log inside a library. Remove this or error out.
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logrus.Errorf("failed to close systemd activated file: fd %d: %v", fdOffset+3, err)
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}
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}
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return []net.Listener{listeners[fdOffset]}, nil
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}
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