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ctrl/metrics.go

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package steward
import (
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"fmt"
"net"
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"net/http"
"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/collectors"
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"github.com/prometheus/client_golang/prometheus/promhttp"
)
// metrics are generally used to hold the structure around metrics
// handling
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type metrics struct {
// The channel to pass metrics that should be processed
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promRegistry *prometheus.Registry
// host and port where prometheus metrics will be exported
hostAndPort string
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//
promTotalProcesses prometheus.Gauge
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//
promProcessesVec *prometheus.GaugeVec
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//
promHelloNodes prometheus.Gauge
//
promHelloNodesNameVec *prometheus.GaugeVec
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}
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// newMetrics will prepare and return a *metrics
func newMetrics(hostAndPort string) *metrics {
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reg := prometheus.NewRegistry()
//prometheus.Unregister(prometheus.NewGoCollector())
reg.MustRegister(collectors.NewGoCollector())
// prometheus.MustRegister(collectors.NewGoCollector())
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m := metrics{
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promRegistry: reg,
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hostAndPort: hostAndPort,
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}
return &m
}
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// Start the http interface for Prometheus metrics.
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func (m *metrics) start() error {
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//http.Handle("/metrics", promhttp.Handler())
//http.ListenAndServe(":2112", nil)
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n, err := net.Listen("tcp", m.hostAndPort)
if err != nil {
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return fmt.Errorf("error: startMetrics: failed to open prometheus listen port: %v", err)
}
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//mux := http.NewServeMux()
//mux.Handle("/metrics", promhttp.Handler())
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http.Handle("/metrics", promhttp.HandlerFor(m.promRegistry, promhttp.HandlerOpts{}))
err = http.Serve(n, nil)
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if err != nil {
return fmt.Errorf("error: startMetrics: failed to start http.Serve: %v", err)
}
return nil
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}