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package main
import (
guestmetric "../guestmetric"
syslog "../syslog"
system "../system"
xenstoreclient "../xenstoreclient"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"os/signal"
"strconv"
"syscall"
"time"
)
const (
LoggerName string = "xe-daemon"
DivisorOne int = 1
DivisorTwo int = 2
DivisorLeastMultiple int = 2 // The least common multiple, ensure every collector done before executing InvalidCacheFlush.
)
func main() {
var err error
sleepInterval := flag.Int("i", 60, "Interval between updates (in seconds)")
debugFlag := flag.Bool("d", false, "Update to stdout rather than xenstore")
balloonFlag := flag.Bool("B", true, "Do not report that ballooning is supported")
pid := flag.String("p", "", "Write the PID to FILE")
flag.Parse()
if *pid != "" {
if err = ioutil.WriteFile(*pid, []byte(strconv.Itoa(os.Getpid())), 0644); err != nil {
fmt.Fprintf(os.Stderr, "Write pid to %s error: %s\n", *pid, err)
return
}
}
var loggerWriter io.Writer = os.Stderr
var topic string = LoggerName
if w, err := syslog.NewSyslogWriter(topic); err == nil {
loggerWriter = w
topic = ""
} else {
fmt.Fprintf(os.Stderr, "NewSyslogWriter(%s) error: %s, use stderr logging\n", topic, err)
topic = LoggerName + ": "
}
logger := log.New(loggerWriter, topic, 0)
exitChannel := make(chan os.Signal, 1)
signal.Notify(exitChannel, syscall.SIGTERM, syscall.SIGINT)
resumedChannel := make(chan int)
go system.NotifyResumed(resumedChannel)
xs, err := xenstoreclient.NewCachedXenstore(0)
if err != nil {
message := fmt.Sprintf("NewCachedXenstore error: %v\n", err)
logger.Print(message)
fmt.Fprint(os.Stderr, message)
return
}
collector := &guestmetric.Collector{
Client: xs,
Ballon: *balloonFlag,
Debug: *debugFlag,
}
collectors := []struct {
divisor int
name string
Collect func() (guestmetric.GuestMetric, error)
}{
{DivisorOne, "CollectOS", collector.CollectOS},
{DivisorOne, "CollectMisc", collector.CollectMisc},
{DivisorOne, "CollectNetworkAddr", collector.CollectNetworkAddr},
{DivisorOne, "CollectDisk", collector.CollectDisk},
{DivisorTwo, "CollectMemory", collector.CollectMemory},
}
lastUniqueID, err := xs.Read("unique-domain-id")
if err != nil {
logger.Printf("xenstore.Read unique-domain-id error: %v\n", err)
}
for count := 0; ; count += 1 {
uniqueID, err := xs.Read("unique-domain-id")
if err != nil {
logger.Printf("xenstore.Read unique-domain-id error: %v\n", err)
return
}
if uniqueID != lastUniqueID {
// VM has just resume, cache state now invalid
lastUniqueID = uniqueID
if cx, ok := xs.(*xenstoreclient.CachedXenStore); ok {
cx.Clear()
}
}
// invoke collectors
updated := false
for _, collector := range collectors {
if count%collector.divisor == 0 {
if *debugFlag {
logger.Printf("Running %s ...\n", collector.name)
}
result, err := collector.Collect()
if err != nil {
logger.Printf("%s error: %#v\n", collector.name, err)
} else {
for name, value := range result {
err := xs.Write(name, value)
if err != nil {
logger.Printf("xenstore.Write error: %v\n", err)
} else {
if *debugFlag {
logger.Printf("xenstore.Write OK: %#v: %#v\n", name, value)
}
updated = true
}
}
}
}
}
if count%DivisorLeastMultiple == 0 {
if cx, ok := xs.(*xenstoreclient.CachedXenStore); ok {
err := cx.InvalidCacheFlush()
if err != nil {
logger.Printf("InvalidCacheFlush error: %#v\n", err)
}
}
}
if updated {
xs.Write("data/updated", time.Now().Format("Mon Jan _2 15:04:05 2006"))
}
select {
case <-exitChannel:
logger.Printf("Received an interrupt, stopping services...\n")
if c, ok := loggerWriter.(io.Closer); ok {
if err := c.Close(); err != nil {
fmt.Fprintf(os.Stderr, "logger close error: %s\n", err)
}
}
return
case <-resumedChannel:
logger.Printf("Trigger refresh after system resume\n")
continue
case <-time.After(time.Duration(*sleepInterval) * time.Second):
continue
}
}
}
|
