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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package services
import (
"fmt"
"os"
"os/exec"
"strconv"
"strings"
"time"
"github.com/vespa-engine/vespa/client/go/internal/admin/envvars"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
"github.com/vespa-engine/vespa/client/go/internal/util"
"github.com/vespa-engine/vespa/client/go/internal/vespa"
)
const (
SENTINEL_PIDFILE = "var/run/sentinel.pid"
SENTINEL_SERVICE_NAME = "config-sentinel"
)
func startSentinelWithRunserver() {
_, veHost := commonPreChecks()
vespa.CheckCorrectUser()
os.Setenv(envvars.VESPA_SERVICE_NAME, SENTINEL_SERVICE_NAME)
configId := fmt.Sprintf("hosts/%s", veHost)
args := []string{
"-r", "10",
"-s", SENTINEL_SERVICE_NAME,
"-p", SENTINEL_PIDFILE,
"--",
"sbin/vespa-config-sentinel",
"-c", configId,
}
cmd := exec.Command("vespa-runserver", args...)
cmd.Stdin = nil
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Start()
p := cmd.Process
if p != nil {
p.Release()
}
os.Unsetenv(envvars.VESPA_SERVICE_NAME)
}
func waitForSentinelPid() bool {
backtick := util.BackTicksWithStderr
start := time.Now()
for sleepcount := 0; sleepcount < 1000; sleepcount++ {
time.Sleep(10 * time.Millisecond)
got, err := os.ReadFile(CONFIGPROXY_PIDFILE)
if err == nil {
pid, err := strconv.Atoi(strings.TrimSpace(string(got)))
if err == nil && pid > 0 {
_, err := backtick.Run("kill", "-0", strconv.Itoa(pid))
if err == nil {
secs := int(time.Since(start).Seconds())
if secs > 0 {
fmt.Printf("config sentinel started after %d seconds\n", secs)
}
return true
}
}
}
if sleepcount%500 == 90 {
trace.Warning("Waiting for sentinel to start")
}
}
return false
}
func StartConfigSentinel() int {
commonPreChecks()
vespa.MaybeSwitchUser("start-config-sentinel")
startSentinelWithRunserver()
if waitForSentinelPid() {
return 0
}
return 1
}
func stopSentinelWithRunserver() {
_, err := util.SystemCommand.Run("vespa-runserver",
"-s", SENTINEL_SERVICE_NAME,
"-p", SENTINEL_PIDFILE, "-S")
if err != nil {
trace.Warning("Stopping sentinel:", err)
}
}
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