[#1135] sdnotify: Send MONOTONIC_USEC on reload

Fixes #1135

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
This commit is contained in:
Evgenii Stratonikov 2024-05-15 13:23:59 +03:00 committed by Evgenii Stratonikov
parent 5c582e96fd
commit f3e09cb09b
3 changed files with 27 additions and 0 deletions

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@ -0,0 +1,10 @@
package sdnotify
import (
// For go:linkname to work.
_ "unsafe"
)
//go:noescape
//go:linkname nanotime runtime.nanotime
func nanotime() int64

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@ -0,0 +1,2 @@
// The file is intentionally empty.
// It is a workaround for https://github.com/golang/go/issues/15006

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@ -38,6 +38,21 @@ func InitSocket() error {
// FlagAndStatus sends systemd a combination of a
// well-known status and STATUS=%s{status}, separated by newline.
func FlagAndStatus(status string) error {
if status == ReloadingEnabled {
// From https://www.man7.org/linux/man-pages/man5/systemd.service.5.html
//
// When initiating the reload process the service is
// expected to reply with a notification message via
// sd_notify(3) that contains the "RELOADING=1" field in
// combination with "MONOTONIC_USEC=" set to the current
// monotonic time (i.e. CLOCK_MONOTONIC in
// clock_gettime(2)) in μs, formatted as decimal string.
// Once reloading is complete another notification message
// must be sent, containing "READY=1".
//
// For MONOTONIC_USEC format refer to https://www.man7.org/linux/man-pages/man3/sd_notify.3.html
status += fmt.Sprintf("\nMONOTONIC_USEC=%d", uint64(nanotime())/1e3 /* microseconds in nanoseconds */)
}
status += "\nSTATUS=" + strings.TrimSuffix(status, "=1")
return Send(status)
}