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feat: add support for systemd socket activation

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If webhook has been launched via systemd socket activation, simply use the systemd-provided socket rather than opening our own.
This commit is contained in:
Ian Roberts 2024-10-19 23:17:38 +01:00
parent 9cd78fca1a
commit b00e93210e
10 changed files with 455 additions and 0 deletions
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20
platform_unix.go
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@ -6,6 +6,7 @@ package main
import (
"flag"
"fmt"
"github.com/coreos/go-systemd/v22/activation"
"net"
)
@ -14,6 +15,25 @@ func platformFlags() {
}
func trySocketListener() (net.Listener, error) {
// first check whether we have any sockets from systemd
listeners, err := activation.Listeners()
if err != nil {
return nil, fmt.Errorf("failed to retrieve sockets from systemd: %w", err)
}
numListeners := len(listeners)
if numListeners > 1 {
return nil, fmt.Errorf("received %d sockets from systemd, but only 1 is supported", numListeners)
}
if numListeners == 1 {
sockAddr := listeners[0].Addr()
if sockAddr.Network() == "tcp" {
addr = sockAddr.String()
} else {
addr = fmt.Sprintf("{%s:%s}", sockAddr.Network(), sockAddr.String())
}
return listeners[0], nil
}
// if we get to here, we got no sockets from systemd, so check -socket flag
if socket != "" {
addr = fmt.Sprintf("{unix:%s}", socket)
return net.Listen("unix", socket)