112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
// +build ganglia
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package collector
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import (
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"bufio"
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"encoding/xml"
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"fmt"
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"io"
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"net"
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"regexp"
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"time"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/node_exporter/collector/ganglia"
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)
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const (
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gangliaAddress = "127.0.0.1:8649"
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gangliaProto = "tcp"
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gangliaTimeout = 30 * time.Second
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gangliaMetricsPrefix = "ganglia_"
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)
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type gmondCollector struct {
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Metrics map[string]*prometheus.GaugeVec
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config Config
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}
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func init() {
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Factories["gmond"] = NewGmondCollector
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}
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var illegalCharsRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
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// Takes a config struct and prometheus registry and returns a new Collector scraping ganglia.
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func NewGmondCollector(config Config) (Collector, error) {
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c := gmondCollector{
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config: config,
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Metrics: map[string]*prometheus.GaugeVec{},
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}
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return &c, nil
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}
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func (c *gmondCollector) setMetric(name, cluster string, metric ganglia.Metric) {
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if _, ok := c.Metrics[name]; !ok {
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var desc string
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var title string
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for _, element := range metric.ExtraData.ExtraElements {
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switch element.Name {
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case "DESC":
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desc = element.Val
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case "TITLE":
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title = element.Val
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}
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if title != "" && desc != "" {
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break
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}
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}
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glog.V(1).Infof("Register %s: %s", name, desc)
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gv := prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: gangliaMetricsPrefix,
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Name: name,
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Help: desc,
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},
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[]string{"cluster"},
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)
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}
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glog.V(1).Infof("Set %s{cluster=%q}: %f", name, cluster, metric.Value)
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c.Metrics[name].WithLabelValues(cluster).Set(metric.Value)
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}
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func (c *gmondCollector) Update(ch chan<- prometheus.Metric) (err error) {
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conn, err := net.Dial(gangliaProto, gangliaAddress)
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glog.V(1).Infof("gmondCollector Update")
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if err != nil {
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return fmt.Errorf("Can't connect to gmond: %s", err)
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}
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conn.SetDeadline(time.Now().Add(gangliaTimeout))
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ganglia := ganglia.Ganglia{}
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decoder := xml.NewDecoder(bufio.NewReader(conn))
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decoder.CharsetReader = toUtf8
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err = decoder.Decode(&ganglia)
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if err != nil {
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return fmt.Errorf("Couldn't parse xml: %s", err)
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}
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for _, cluster := range ganglia.Clusters {
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for _, host := range cluster.Hosts {
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for _, metric := range host.Metrics {
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name := illegalCharsRE.ReplaceAllString(metric.Name, "_")
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c.setMetric(name, cluster.Name, metric)
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}
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}
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}
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for _, m := range c.Metrics {
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m.Collect(ch)
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}
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return err
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}
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func toUtf8(charset string, input io.Reader) (io.Reader, error) {
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return input, nil //FIXME
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}
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