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/*
* Copyright (C) 2018 "IoT.bzh"
* Author Clément Bénier <clement.benier@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package xdsserver
import (
"os/exec"
"path"
"path/filepath"
"strings"
sc "sync"
"time"
common "gerrit.automotivelinux.org/gerrit/src/xds/xds-common.git"
"gerrit.automotivelinux.org/gerrit/src/xds/xds-server.git/lib/xdsconfig"
"gerrit.automotivelinux.org/gerrit/src/xds/xds-server.git/lib/xsapiv1"
)
const (
scriptXdsSrvUpdate = "updateXdsServerPackage"
scriptGetXdsSrvUpdate = "getXdsServerPackage"
scriptXdsSrvRestart = "restartXdsServer"
)
//LockXdsUpdate allows to lock xds-server avoiding restart
type LockXdsUpdate struct {
sc.Mutex
LockCpt int
}
//LockXdsUpdateCounter Inc/decrement lock counter
func LockXdsUpdateCounter(ctx *Context, inc bool) {
if inc {
//paranoia lock count > 10
if ctx.lockXdsSrvUpdate.LockCpt > 10 {
ctx.Log.Errorf("lock counter value is abnormally high: LockCpt=%v", ctx.lockXdsSrvUpdate.LockCpt)
}
ctx.lockXdsSrvUpdate.Lock()
ctx.lockXdsSrvUpdate.LockCpt++
ctx.lockXdsSrvUpdate.Unlock()
} else {
//paranoia lock count < 0
if ctx.lockXdsSrvUpdate.LockCpt <= 0 {
ctx.Log.Errorf("lock counter value is lower than 0: LockCpt=%v", ctx.lockXdsSrvUpdate.LockCpt)
return
}
ctx.lockXdsSrvUpdate.Lock()
ctx.lockXdsSrvUpdate.LockCpt--
ctx.lockXdsSrvUpdate.Unlock()
}
}
//MonitorUpdates try to update xds-server package at first
// then monitor updates
func MonitorUpdates(ctx *Context) {
UpdateXdsServer(ctx) //try to update at startup
updateTime, err := time.ParseDuration(ctx.Config.FileConf.XdsSrvUpdateTime)
if err != nil {
ctx.Log.Errorf("Wrong format type of XdsSrvUpdateTime\n"+
"err=%v \n"+
"Valid time units are ns, us, ms, s, m, h\n"+
"Here an example: 1h10m10s\n"+
"So, default value is set %v", err, xdsconfig.DefaultXdsSrvUpdateTime)
updateTime, _ = time.ParseDuration(xdsconfig.DefaultXdsSrvUpdateTime)
}
ctx.Log.Infof("Update time for package xds-server is %v", updateTime)
go func(ctx *Context) {
for {
currentUpdateTime := updateTime
for currentUpdateTime > 0 {
time.Sleep(currentUpdateTime)
currentUpdateTime = UpdateXdsServer(ctx)
}
}
}(ctx)
}
func getScriptsDir(ctx *Context) string {
scriptsDir := ctx.Config.FileConf.XdsUtilsScriptsDir
if !common.Exists(scriptsDir) {
// allow to use scripts/xds-utils when debugging with vscode(EXEPATH=WORKSPACE)
scriptsDir = filepath.Join(filepath.Dir(ctx.Config.FileConf.XdsUtilsScriptsDir), "scripts", "xds-utils")
if !common.Exists(scriptsDir) {
ctx.Log.Errorf("scripts directory doesn't exist (%v)", scriptsDir)
}
}
return scriptsDir
}
// UpdateXdsServer launches update package xds-server script
func UpdateXdsServer(ctx *Context) time.Duration {
timeToRestartIfBusy := 0 * time.Minute
scriptsDir := getScriptsDir(ctx)
ctx.Log.Infof("Trying to update xds-server package, "+
"xds-utils scripts dir: %s", scriptsDir)
//launch xds-server update package script
cmd := exec.Command(path.Join(scriptsDir, scriptXdsSrvUpdate))
_, err := cmd.CombinedOutput()
if err != nil {
ctx.Log.Errorf("Cannot update xds-server package err=%v", err)
return 0
}
//launch xds-server restart script
cmd = exec.Command(path.Join(scriptsDir, scriptXdsSrvRestart))
ctx.lockXdsSrvUpdate.Lock()
if ctx.lockXdsSrvUpdate.LockCpt == 0 { //no action in progress
_, err = cmd.CombinedOutput()
if err != nil {
ctx.Log.Errorf("Cannot restart xds-server service err=%v", err)
return 0
}
} else {
timeToRestartIfBusy = 1 * time.Minute
ctx.Log.Infof("Cannot restart xds-server service because "+
"xds-server has an action in progress, trying to restart in a %v", timeToRestartIfBusy)
}
ctx.lockXdsSrvUpdate.Unlock()
return timeToRestartIfBusy
}
// GetXdsSrvUpdate gets information about package
func GetXdsSrvUpdate(ctx *Context) xsapiv1.XdsSrvUpdate {
var xdsSrvUpdate xsapiv1.XdsSrvUpdate
scriptsDir := getScriptsDir(ctx)
//exec getXdsSrvUpdate script
cmd := exec.Command(path.Join(scriptsDir, scriptGetXdsSrvUpdate))
stdout, err := cmd.CombinedOutput()
if err != nil {
ctx.Log.Errorf("Cannot get xds-server package information err=%v", err)
return xdsSrvUpdate
}
//stdout is formatting with 'version: xxxxx'
outputs := strings.Split(string(stdout[:]), "\n")
installedVersion := strings.Split(outputs[0], ": ")[1]
candidateVersion := strings.Split(outputs[1], ": ")[1]
ctx.Log.Infof("XdsSrvUpdate: candidateVersion:%v installedVersion:%v", candidateVersion, installedVersion)
xdsSrvUpdate = xsapiv1.XdsSrvUpdate{
CurrentVersion: installedVersion,
NewerVersion: candidateVersion,
UpdateTime: ctx.Config.FileConf.XdsSrvUpdateTime,
}
return xdsSrvUpdate
}
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