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main.go
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package main
import (
"flag"
"fmt"
"net/http"
"sort"
"strings"
"time"
"github.com/DSpeichert/gophercloud/openstack"
"github.com/DSpeichert/gophercloud/openstack/telemetry/v2/meters"
"github.com/rackspace/gophercloud"
"github.com/rackspace/gophercloud/openstack/compute/v2/servers"
"github.com/rackspace/gophercloud/openstack/networking/v2/extensions/lbaas/pools"
"github.com/rackspace/gophercloud/pagination"
"github.com/prometheus/client_golang/prometheus"
log "github.com/Sirupsen/logrus"
"github.com/ryanuber/go-glob"
)
/*
TODOs:
- Auth without env?
- Split metric types (HW/Resources/...) (?)
- Support for meter/foo/statistics for some types?
- Multiple scrapers
- Split to multiple files
- Calculated metrics (eg count of rules in firewall policy)
- Timeout?
*/
func init() {
flag.Parse()
parsedLevel, err := log.ParseLevel(*rawLevel)
if err != nil {
log.Fatal(err)
}
logLevel = parsedLevel
enabledMetrics = strings.Split(*rawEnabledMetrics, ",")
disabledMetrics = strings.Split(*rawDisabledMetrics, ",")
}
const (
namespace = "openstack_ceilometer"
defaultEnabledMetrics = "*"
)
var (
logLevel = log.InfoLevel
rawLevel = flag.String("log-level", "info", "log level")
bindAddr = flag.String("bind-addr", ":9181", "bind address for the metrics server")
metricsPath = flag.String("metrics-path", "/metrics", "path to metrics endpoint")
maxResults = flag.Int("max-results", 100, "maximum number of results to fetch for any metric")
maxMetricAge = flag.Duration("max-metric-age", 5*time.Minute, "maximum age of metrics to retrieve")
enabledMetrics []string
rawEnabledMetrics = flag.String("enabled-metrics", defaultEnabledMetrics, "comma-separated list of metrics to enable (supports globbing)")
disabledMetrics []string
rawDisabledMetrics = flag.String("disabled-metrics", "", "comma-separated list of metrics to disable (supports globbing)")
listMetrics = flag.Bool("list-metrics", false, "show list of metrics and exit")
)
func shouldUseMetric(metric string) bool {
for _, enabled := range enabledMetrics {
if glob.Glob(enabled, metric) {
for _, disabled := range disabledMetrics {
if glob.Glob(disabled, metric) {
return false
}
}
return true
}
}
return false
}
func main() {
log.SetLevel(logLevel)
if *listMetrics {
displayMetricsList()
return
}
prometheus.MustRegister(NewCeilometerCollector())
http.Handle(*metricsPath, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Openstack Ceilometer Exporter</title></head>
<body>
<h1>Openstack Ceilometer Exporter</h1>
<p><a href='` + *metricsPath + `'>Metrics</a></p>
</body>
</html>`))
})
log.Infof("Starting metric server on %v%v", *bindAddr, *metricsPath)
log.Fatal(http.ListenAndServe(*bindAddr, nil))
}
func displayMetricsList() {
metrics := *getMetrics(nil)
availableMetrics := make([]string, 0, len(metrics))
for name, _ := range metrics {
availableMetrics = append(availableMetrics, name)
}
sort.Strings(availableMetrics)
for _, metric := range availableMetrics {
fmt.Println(metric)
}
}
type LookupService struct {
poolNameCache map[string]string
poolTenantCache map[string]string
networkClient *gophercloud.ServiceClient
instanceNameCache map[string]string
instanceTenantCache map[string]string
serverClient *gophercloud.ServiceClient
}
func NewLookupService(provider *gophercloud.ProviderClient) LookupService {
networkClient, err := openstack.NewNetworkV2(provider, gophercloud.EndpointOpts{})
if err != nil {
panic(err)
}
serverClient, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{})
if err != nil {
panic(err)
}
log.Debug("Populating guid lookup caches")
poolNameCache := make(map[string]string)
poolTenantCache := make(map[string]string)
poolPager := pools.List(networkClient, pools.ListOpts{})
poolPager.EachPage(func(page pagination.Page) (bool, error) {
poolList, err := pools.ExtractPools(page)
if err != nil {
return false, err
}
for _, pool := range poolList {
poolNameCache[pool.ID] = pool.Name
poolTenantCache[pool.ID] = pool.TenantID
}
return true, nil
})
serverNameCache := make(map[string]string)
serverTenantCache := make(map[string]string)
serverPager := servers.List(serverClient, servers.ListOpts{AllTenants: true})
serverPager.EachPage(func(page pagination.Page) (bool, error) {
serverList, err := servers.ExtractServers(page)
if err != nil {
return false, err
}
for _, server := range serverList {
serverNameCache[server.ID] = server.Name
serverTenantCache[server.ID] = server.TenantID
}
return true, nil
})
log.Debugf("Finished populating caches. %d pools and %d instances prepared.", len(poolNameCache), len(serverNameCache))
return LookupService{
networkClient: networkClient,
poolNameCache: poolNameCache,
poolTenantCache: poolTenantCache,
serverClient: serverClient,
instanceNameCache: serverNameCache,
instanceTenantCache: serverTenantCache,
}
}
func (this *LookupService) lookupPoolTenant(poolId string) string {
if poolId == "" {
return "UNKNOWN"
}
var tenant string
if tenant, ok := this.poolTenantCache[poolId]; ok {
return tenant
}
result := pools.Get(this.networkClient, poolId)
pool, err := result.Extract()
if err != nil {
log.Warnf("Failure while looking up pool id %q", poolId)
tenant = "UNKNOWN"
} else {
tenant = pool.TenantID
}
this.poolTenantCache[poolId] = tenant
return tenant
}
func (this *LookupService) lookupPool(poolId string) string {
if poolId == "" {
return "UNKNOWN"
}
var name string
if name, ok := this.poolNameCache[poolId]; ok {
return name
}
result := pools.Get(this.networkClient, poolId)
pool, err := result.Extract()
if err != nil {
log.Warnf("Failure while looking up pool id %q", poolId)
name = "UNKNOWN"
} else {
name = pool.Name
}
this.poolNameCache[poolId] = name
return name
}
func (this *LookupService) lookupInstanceTenant(instanceId string) string {
if instanceId == "" {
return "UNKNOWN"
}
var tenant string
if tenant, ok := this.instanceTenantCache[instanceId]; ok {
return tenant
}
result := servers.Get(this.serverClient, instanceId)
instance, err := result.Extract()
if err != nil {
log.Warnf("Failure while looking up instance id %q", instanceId)
tenant = "UNKNOWN"
} else {
tenant = instance.TenantID
}
this.instanceTenantCache[instanceId] = tenant
return tenant
}
func (this *LookupService) lookupInstance(instanceId string) string {
if instanceId == "" {
return "UNKNOWN"
}
var name string
if name, ok := this.instanceNameCache[instanceId]; ok {
return name
}
result := servers.Get(this.serverClient, instanceId)
instance, err := result.Extract()
if err != nil {
log.Warnf("Failure while looking up instance id %q", instanceId)
name = "UNKNOWN"
} else {
name = instance.Name
}
this.instanceNameCache[instanceId] = name
return name
}
func makeFQName(metric string) string {
return fmt.Sprintf("%s_%s", namespace, metric)
}
func NewCeilometerCollector() *ceilometerCollector {
opts, err := openstack.AuthOptionsFromEnv()
if err != nil {
panic(err)
}
provider, err := openstack.AuthenticatedClient(opts)
if err != nil {
panic(err)
}
lookupSvc := NewLookupService(provider)
allMetrics := *getMetrics(&lookupSvc)
filteredMetrics := make(map[string]ceilometerMetric)
for name, metric := range allMetrics {
if shouldUseMetric(name) {
filteredMetrics[name] = metric
}
}
return &ceilometerCollector{
metrics: filteredMetrics,
metaMetrics: map[string]*prometheus.Desc{
"scrapeSuccess": prometheus.NewDesc(makeFQName("metric_scrape_success"), "Indicates if the metric was successfully scraped", []string{"metric"}, nil),
"scrapeDuration": prometheus.NewDesc(makeFQName("metric_scrape_duration_ns"), "The time taken to scrape the metric", []string{"metric"}, nil),
"scrapeResultSize": prometheus.NewDesc(makeFQName("metric_scrape_result_size"), "Number of results returned by the metric query", []string{"metric"}, nil),
"totalScrapeDuration": prometheus.NewDesc(makeFQName("total_scrape_duration_ns"), "Time taken for entire scrape", nil, nil),
},
opts: &opts,
}
}
type ceilometerCollector struct {
opts *gophercloud.AuthOptions
metrics map[string]ceilometerMetric
metaMetrics map[string]*prometheus.Desc
}
type ceilometerMetric struct {
desc *prometheus.Desc
extractLabels func(*meters.OldSample) []string
}
func (c *ceilometerCollector) Describe(ch chan<- *prometheus.Desc) {
log.Debugf("Sending %d metrics descriptions", len(c.metrics)+len(c.metaMetrics))
for _, metric := range c.metrics {
ch <- metric.desc
}
for _, metric := range c.metaMetrics {
ch <- metric
}
}
func (c *ceilometerCollector) Collect(ch chan<- prometheus.Metric) {
t := time.Now()
result := make(chan scrapeStats)
defer close(result)
provider, err := openstack.AuthenticatedClient(*c.opts)
if err != nil {
panic(err)
}
client, err := openstack.NewTelemetryV2(provider, gophercloud.EndpointOpts{})
if err != nil {
panic(err)
}
for resourceLabel, metric := range c.metrics {
go scrape(resourceLabel, metric, client, ch, result)
}
for _ = range c.metrics {
scrapeStats := <-result
ch <- prometheus.MustNewConstMetric(c.metaMetrics["scrapeSuccess"], prometheus.GaugeValue, btof(scrapeStats.success), scrapeStats.resourceLabel)
ch <- prometheus.MustNewConstMetric(c.metaMetrics["scrapeDuration"], prometheus.GaugeValue, float64(scrapeStats.duration.Nanoseconds()), scrapeStats.resourceLabel)
ch <- prometheus.MustNewConstMetric(c.metaMetrics["scrapeResultSize"], prometheus.GaugeValue, float64(scrapeStats.resultSize), scrapeStats.resourceLabel)
}
ch <- prometheus.MustNewConstMetric(c.metaMetrics["totalScrapeDuration"], prometheus.GaugeValue, float64(time.Since(t).Nanoseconds()))
}
func btof(b bool) float64 {
if b {
return 1.0
} else {
return 0.0
}
}
type scrapeStats struct {
resourceLabel string
success bool
duration time.Duration
resultSize int
}
func sendStats(ch chan<- scrapeStats, stats *scrapeStats) {
ch <- *stats
}
func registerDuration(start time.Time, stats *scrapeStats) {
stats.duration = time.Since(start)
}
func scrape(resourceLabel string, metric ceilometerMetric, client *gophercloud.ServiceClient, ch chan<- prometheus.Metric, result chan<- scrapeStats) {
t := time.Now()
stats := scrapeStats{resourceLabel: resourceLabel}
defer sendStats(result, &stats)
defer registerDuration(t, &stats)
query := meters.ShowOpts{
QueryField: "timestamp",
QueryOp: "gt",
QueryValue: time.Now().UTC().Add(-*maxMetricAge).Format("2006-01-02T15:04:05"),
Limit: *maxResults,
}
log.Debugf("Querying for %v: %v", resourceLabel, query)
results := meters.Show(client, resourceLabel, query)
data, err := results.Extract()
if err != nil {
log.Warnf("Failed to scrape Ceilometer resource %q", resourceLabel)
return
}
if len(data) == 0 {
log.Warnf("Query for %v returned no results!", resourceLabel)
stats.success = true // The query itself was successful, even though no results were produced
return
}
if len(data) == *maxResults {
log.Warnf("Query for %v returned max number of results (%d), data may be truncated", resourceLabel, *maxResults)
}
initialLen := len(data)
data = deduplicate(data)
log.Debugf("Query for %s returned %d results, %d remain after deduplication", resourceLabel, initialLen, len(data))
stats.resultSize = len(data)
for _, sample := range data {
ch <- sampleToMetric(&sample, metric)
}
stats.success = true
}
func deduplicate(samples []meters.OldSample) []meters.OldSample {
unique := make([]meters.OldSample, 0, len(samples))
seen := make(map[string]bool)
for _, sample := range samples {
if _, ok := seen[sample.ResourceId]; !ok {
seen[sample.ResourceId] = true
unique = append(unique, sample)
}
}
return unique
}
func sampleToMetric(sample *meters.OldSample, metric ceilometerMetric) prometheus.Metric {
var valueType prometheus.ValueType
switch sample.Type {
case "gauge":
valueType = prometheus.GaugeValue
case "cumulative":
valueType = prometheus.CounterValue
default:
log.Debugf("Unknown sample type %v in query for %v", sample.Type, sample.Name)
valueType = prometheus.UntypedValue
}
value := float64(sample.Volume)
return prometheus.MustNewConstMetric(metric.desc, valueType, value, metric.extractLabels(sample)...)
}