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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !nogmond
package collector
import (
"bufio"
"encoding/xml"
"fmt"
"io"
"net"
"regexp"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/node_exporter/collector/ganglia"
)
const (
gangliaAddress = "127.0.0.1:8649"
gangliaProto = "tcp"
gangliaTimeout = 30 * time.Second
gangliaNamespace = "ganglia"
)
type gmondCollector struct {
metrics map[string]*prometheus.GaugeVec
}
func init() {
registerCollector("gmond", defaultDisabled, NewGmondCollector)
}
var illegalCharsRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
// NewGmondCollector returns a new Collector scraping ganglia.
func NewGmondCollector() (Collector, error) {
warnDeprecated("gmond")
c := gmondCollector{
metrics: map[string]*prometheus.GaugeVec{},
}
return &c, nil
}
func (c *gmondCollector) Update(ch chan<- prometheus.Metric) error {
conn, err := net.Dial(gangliaProto, gangliaAddress)
log.Debugf("gmondCollector Update")
if err != nil {
return fmt.Errorf("can't connect to gmond: %s", err)
}
conn.SetDeadline(time.Now().Add(gangliaTimeout))
ganglia := ganglia.Ganglia{}
decoder := xml.NewDecoder(bufio.NewReader(conn))
decoder.CharsetReader = toUtf8
err = decoder.Decode(&ganglia)
if err != nil {
return fmt.Errorf("couldn't parse xml: %s", err)
}
for _, cluster := range ganglia.Clusters {
for _, host := range cluster.Hosts {
for _, metric := range host.Metrics {
name := illegalCharsRE.ReplaceAllString(metric.Name, "_")
c.setMetric(name, cluster.Name, metric)
}
}
}
for _, m := range c.metrics {
m.Collect(ch)
}
return err
}
func (c *gmondCollector) setMetric(name, cluster string, metric ganglia.Metric) {
if _, ok := c.metrics[name]; !ok {
var desc string
var title string
for _, element := range metric.ExtraData.ExtraElements {
switch element.Name {
case "DESC":
desc = element.Val
case "TITLE":
title = element.Val
}
if title != "" && desc != "" {
break
}
}
log.Debugf("Register %s: %s", name, desc)
c.metrics[name] = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: gangliaNamespace,
Name: name,
Help: desc,
},
[]string{"cluster"},
)
}
log.Debugf("Set %s{cluster=%q}: %f", name, cluster, metric.Value)
c.metrics[name].WithLabelValues(cluster).Set(metric.Value)
}
func toUtf8(charset string, input io.Reader) (io.Reader, error) {
return input, nil //FIXME
}
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