mirror of https://github.com/slackhq/nebula.git
128 lines
3.6 KiB
Go
128 lines
3.6 KiB
Go
package nebula
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import (
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"errors"
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"fmt"
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"log"
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"net"
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"net/http"
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"runtime"
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"strconv"
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"time"
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graphite "github.com/cyberdelia/go-metrics-graphite"
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mp "github.com/nbrownus/go-metrics-prometheus"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/rcrowley/go-metrics"
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"github.com/sirupsen/logrus"
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"github.com/slackhq/nebula/config"
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)
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// startStats initializes stats from config. On success, if any further work
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// is needed to serve stats, it returns a func to handle that work. If no
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// work is needed, it'll return nil. On failure, it returns nil, error.
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func startStats(l *logrus.Logger, c *config.C, buildVersion string, configTest bool) (func(), error) {
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mType := c.GetString("stats.type", "")
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if mType == "" || mType == "none" {
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return nil, nil
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}
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interval := c.GetDuration("stats.interval", 0)
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if interval == 0 {
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return nil, fmt.Errorf("stats.interval was an invalid duration: %s", c.GetString("stats.interval", ""))
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}
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var startFn func()
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switch mType {
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case "graphite":
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err := startGraphiteStats(l, interval, c, configTest)
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if err != nil {
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return nil, err
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}
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case "prometheus":
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var err error
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startFn, err = startPrometheusStats(l, interval, c, buildVersion, configTest)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("stats.type was not understood: %s", mType)
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}
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metrics.RegisterDebugGCStats(metrics.DefaultRegistry)
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metrics.RegisterRuntimeMemStats(metrics.DefaultRegistry)
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go metrics.CaptureDebugGCStats(metrics.DefaultRegistry, interval)
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go metrics.CaptureRuntimeMemStats(metrics.DefaultRegistry, interval)
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return startFn, nil
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}
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func startGraphiteStats(l *logrus.Logger, i time.Duration, c *config.C, configTest bool) error {
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proto := c.GetString("stats.protocol", "tcp")
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host := c.GetString("stats.host", "")
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if host == "" {
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return errors.New("stats.host can not be empty")
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}
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prefix := c.GetString("stats.prefix", "nebula")
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addr, err := net.ResolveTCPAddr(proto, host)
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if err != nil {
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return fmt.Errorf("error while setting up graphite sink: %s", err)
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}
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if !configTest {
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l.Infof("Starting graphite. Interval: %s, prefix: %s, addr: %s", i, prefix, addr)
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go graphite.Graphite(metrics.DefaultRegistry, i, prefix, addr)
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}
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return nil
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}
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func startPrometheusStats(l *logrus.Logger, i time.Duration, c *config.C, buildVersion string, configTest bool) (func(), error) {
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namespace := c.GetString("stats.namespace", "")
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subsystem := c.GetString("stats.subsystem", "")
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listen := c.GetString("stats.listen", "")
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if listen == "" {
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return nil, fmt.Errorf("stats.listen should not be empty")
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}
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path := c.GetString("stats.path", "")
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if path == "" {
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return nil, fmt.Errorf("stats.path should not be empty")
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}
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pr := prometheus.NewRegistry()
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pClient := mp.NewPrometheusProvider(metrics.DefaultRegistry, namespace, subsystem, pr, i)
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if !configTest {
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go pClient.UpdatePrometheusMetrics()
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}
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// Export our version information as labels on a static gauge
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g := prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "info",
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Help: "Version information for the Nebula binary",
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ConstLabels: prometheus.Labels{
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"version": buildVersion,
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"goversion": runtime.Version(),
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"boringcrypto": strconv.FormatBool(boringEnabled()),
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},
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})
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pr.MustRegister(g)
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g.Set(1)
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var startFn func()
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if !configTest {
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startFn = func() {
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l.Infof("Prometheus stats listening on %s at %s", listen, path)
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http.Handle(path, promhttp.HandlerFor(pr, promhttp.HandlerOpts{ErrorLog: l}))
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log.Fatal(http.ListenAndServe(listen, nil))
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}
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}
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return startFn, nil
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}
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