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main.go
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main.go
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package main
import (
"context"
"fmt"
"net"
"net/http"
"os"
"strings"
"github.com/openstack-exporter/openstack-exporter/exporters"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
"gopkg.in/alecthomas/kingpin.v2"
)
var defaultEnabledServices = []string{"network", "compute", "image", "volume", "identity", "object-store", "load-balancer", "container-infra", "dns", "baremetal", "gnocchi", "database", "orchestration", "placement"}
var DEFAULT_OS_CLIENT_CONFIG = "/etc/openstack/clouds.yaml"
var (
logLevel = kingpin.Flag("log.level", "Log level: [debug, info, warn, error, fatal]").Default("info").String()
bind = kingpin.Flag("web.listen-address", "address:port to listen on").Default(":9180").String()
metrics = kingpin.Flag("web.telemetry-path", "uri path to expose metrics").Default("/metrics").String()
osClientConfig = kingpin.Flag("os-client-config", "Path to the cloud configuration file").Default(DEFAULT_OS_CLIENT_CONFIG).String()
prefix = kingpin.Flag("prefix", "Prefix for metrics").Default("openstack").String()
endpointType = kingpin.Flag("endpoint-type", "openstack endpoint type to use (i.e: public, internal, admin)").Default("public").String()
collectTime = kingpin.Flag("collect-metric-time", "time spent collecting each metric").Default("false").Bool()
disabledMetrics = kingpin.Flag("disable-metric", "multiple --disable-metric can be specified in the format: service-metric (i.e: cinder-snapshots)").Default("").Short('d').Strings()
disableSlowMetrics = kingpin.Flag("disable-slow-metrics", "Disable slow metrics for performance reasons").Default("false").Bool()
disableDeprecatedMetrics = kingpin.Flag("disable-deprecated-metrics", "Disable deprecated metrics").Default("false").Bool()
disableCinderAgentUUID = kingpin.Flag("disable-cinder-agent-uuid", "Disable UUID generation for Cinder agents").Default("false").Bool()
cloud = kingpin.Arg("cloud", "name or id of the cloud to gather metrics from").String()
multiCloud = kingpin.Flag("multi-cloud", "Toggle the multiple cloud scraping mode under /probe?cloud=").Default("false").Bool()
)
func main() {
services := make(map[string]*bool)
for _, service := range defaultEnabledServices {
flagName := fmt.Sprintf("disable-service.%s", service)
flagHelp := fmt.Sprintf("Disable the %s service exporter", service)
services[service] = kingpin.Flag(flagName, flagHelp).Default().Bool()
}
kingpin.Version(version.Print("openstack-exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
if *cloud == "" && !*multiCloud {
log.Fatalln("openstack-exporter: error: required argument 'cloud' or flag --multi-cloud not provided, try --help")
}
err := log.Base().SetLevel(*logLevel)
if err != nil {
log.Errorf("Cannot init set logger level: %s", err)
os.Exit(-1)
}
log.Infoln("Build context", version.BuildContext())
if *osClientConfig != DEFAULT_OS_CLIENT_CONFIG {
log.Debugf("Setting Env var OS_CLIENT_CONFIG_FILE = %s", *osClientConfig)
os.Setenv("OS_CLIENT_CONFIG_FILE", *osClientConfig)
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(`<html>
<head><title>OpenStack Exporter</title></head>
<body>
<h1>OpenStack Exporter</h1>
<p><a href='` + *metrics + `'>Metrics</a></p>
</body>
</html>`))
if err != nil {
log.Error(err)
}
})
if *multiCloud {
http.HandleFunc("/probe", probeHandler(services))
http.Handle("/metrics", promhttp.Handler())
log.Infoln("openstack exporter started in multi cloud mode (/probe?cloud=)")
} else {
log.Infoln("openstack exporter started in legacy mode")
http.HandleFunc(*metrics, metricHandler(services))
}
if *bind == "" {
log.Info("--web.listen-address is empty. HTTP server will start on :9180")
*bind = ":9180"
}
tcp := exporters.IP4or6(*bind)
l, err := net.Listen(tcp, *bind)
if err != nil {
log.Fatal(err)
}
log.Infoln("Starting HTTP server on", *bind)
log.Fatal(http.Serve(l, nil))
}
func probeHandler(services map[string]*bool) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithCancel(r.Context())
defer cancel()
r = r.WithContext(ctx)
registry := prometheus.NewPedanticRegistry()
cloud := r.URL.Query().Get("cloud")
if cloud == "" {
http.Error(w, "'cloud' parameter is missing", http.StatusBadRequest)
return
}
enabledServices := []string{}
for service, disabled := range services {
if !*disabled {
enabledServices = append(enabledServices, service)
}
}
includeServices := r.URL.Query().Get("include_services")
if includeServices != "" {
enabledServices = strings.Split(includeServices, ",")
}
excludeServices := strings.Split(r.URL.Query().Get("exclude_services"), ",")
enabledServices = exporters.RemoveElements(enabledServices, excludeServices)
log.Infof("Enabled services: %v", enabledServices)
for _, service := range enabledServices {
exp, err := exporters.EnableExporter(service, *prefix, cloud, *disabledMetrics, *endpointType, *collectTime, *disableSlowMetrics, *disableDeprecatedMetrics, *disableCinderAgentUUID, nil)
if err != nil {
log.Errorf("enabling exporter for service %s failed: %s", service, err)
continue
}
registry.MustRegister(*exp)
log.Infof("Enabled exporter for service: %s", service)
}
h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
func metricHandler(services map[string]*bool) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
log.Infof("Starting openstack exporter version %s for cloud: %s", version.Info(), *cloud)
log.Infoln("Build context", version.BuildContext())
if *osClientConfig != DEFAULT_OS_CLIENT_CONFIG {
log.Debugf("Setting Env var OS_CLIENT_CONFIG_FILE = %s", *osClientConfig)
os.Setenv("OS_CLIENT_CONFIG_FILE", *osClientConfig)
}
registry := prometheus.NewPedanticRegistry()
enabledExporters := 0
for service, disabled := range services {
if !*disabled {
exp, err := exporters.EnableExporter(service, *prefix, *cloud, *disabledMetrics, *endpointType, *collectTime, *disableSlowMetrics, *disableDeprecatedMetrics, *disableCinderAgentUUID, nil)
if err != nil {
// Log error and continue with enabling other exporters
log.Errorf("enabling exporter for service %s failed: %s", service, err)
continue
}
registry.MustRegister(*exp)
log.Infof("Enabled exporter for service: %s", service)
enabledExporters++
}
}
if enabledExporters == 0 {
log.Errorln("No exporter has been enabled, exiting")
os.Exit(-1)
}
h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}