123 lines
4 KiB
Go
123 lines
4 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package collector
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import (
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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)
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type (
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nginxStatusCollector struct {
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scrapeChan chan scrapeRequest
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ngxHealthPort int
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ngxVtsPath string
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data *nginxStatusData
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watchNamespace string
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ingressClass string
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}
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nginxStatusData struct {
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connectionsTotal *prometheus.Desc
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requestsTotal *prometheus.Desc
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connections *prometheus.Desc
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}
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)
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// NewNginxStatus returns a new prometheus collector the default nginx status module
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func NewNginxStatus(watchNamespace, ingressClass string, ngxHealthPort int, ngxVtsPath string) Stopable {
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p := nginxStatusCollector{
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scrapeChan: make(chan scrapeRequest),
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ngxHealthPort: ngxHealthPort,
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ngxVtsPath: ngxVtsPath,
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watchNamespace: watchNamespace,
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ingressClass: ingressClass,
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}
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p.data = &nginxStatusData{
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connectionsTotal: prometheus.NewDesc(
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prometheus.BuildFQName(ns, "", "connections_total"),
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"total number of connections with state {active, accepted, handled}",
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[]string{"ingress_class", "namespace", "state"}, nil),
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requestsTotal: prometheus.NewDesc(
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prometheus.BuildFQName(ns, "", "requests_total"),
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"total number of client requests",
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[]string{"ingress_class", "namespace"}, nil),
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connections: prometheus.NewDesc(
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prometheus.BuildFQName(ns, "", "connnections"),
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"current number of client connections with state {reading, writing, waiting}",
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[]string{"ingress_class", "namespace", "state"}, nil),
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}
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go p.start()
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return p
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}
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// Describe implements prometheus.Collector.
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func (p nginxStatusCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- p.data.connectionsTotal
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ch <- p.data.requestsTotal
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ch <- p.data.connections
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}
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// Collect implements prometheus.Collector.
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func (p nginxStatusCollector) Collect(ch chan<- prometheus.Metric) {
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req := scrapeRequest{results: ch, done: make(chan struct{})}
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p.scrapeChan <- req
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<-req.done
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}
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func (p nginxStatusCollector) start() {
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for req := range p.scrapeChan {
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ch := req.results
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p.scrape(ch)
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req.done <- struct{}{}
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}
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}
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func (p nginxStatusCollector) Stop() {
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close(p.scrapeChan)
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}
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// nginxStatusCollector scrape the nginx status
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func (p nginxStatusCollector) scrape(ch chan<- prometheus.Metric) {
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s, err := getNginxStatus(p.ngxHealthPort, p.ngxVtsPath)
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if err != nil {
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glog.Warningf("unexpected error obtaining nginx status info: %v", err)
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return
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}
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ch <- prometheus.MustNewConstMetric(p.data.connectionsTotal,
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prometheus.CounterValue, float64(s.Active), p.ingressClass, p.watchNamespace, "active")
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ch <- prometheus.MustNewConstMetric(p.data.connectionsTotal,
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prometheus.CounterValue, float64(s.Accepted), p.ingressClass, p.watchNamespace, "accepted")
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ch <- prometheus.MustNewConstMetric(p.data.connectionsTotal,
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prometheus.CounterValue, float64(s.Handled), p.ingressClass, p.watchNamespace, "handled")
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ch <- prometheus.MustNewConstMetric(p.data.requestsTotal,
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prometheus.CounterValue, float64(s.Requests), p.ingressClass, p.watchNamespace)
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ch <- prometheus.MustNewConstMetric(p.data.connections,
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prometheus.GaugeValue, float64(s.Reading), p.ingressClass, p.watchNamespace, "reading")
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ch <- prometheus.MustNewConstMetric(p.data.connections,
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prometheus.GaugeValue, float64(s.Writing), p.ingressClass, p.watchNamespace, "writing")
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ch <- prometheus.MustNewConstMetric(p.data.connections,
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prometheus.GaugeValue, float64(s.Waiting), p.ingressClass, p.watchNamespace, "waiting")
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}
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