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main.go
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main.go
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/*
* Copyright (c) 2021, Peter Haag
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the author nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Poc to implement a metric exporter for nfcapd collectors to Prometheus
*/
package main
import (
"fmt"
"flag"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"sync"
"strconv"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const namespace = "nfsen"
var mutex *sync.Mutex
var (
listenAddress = flag.String("listen", ":9141",
"Address to listen on for telemetry")
metricsURI = flag.String("metrics URI", "/metrics",
"Path under which to expose metrics")
socketPath = flag.String("UNIX socket", "/tmp/nfsen.sock",
"Path for nfcapd collectors to connect")
)
var (
// Metrics
uptime = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "collector", "uptime"),
"nfsen uptime.",
[]string{"version"}, nil,
)
flowsReceived = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "collector", "flows"),
"How many flows have been received (per ident and protocol (tcp/udp/icmp/other)).",
[]string{"ident", "exporter", "proto"}, nil,
)
packetsReceived = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "collector", "packets"),
"How many packets have been received (per ident and protocol) (tcp/udp/icmp/other).",
[]string{"ident", "exporter", "proto"}, nil,
)
bytesReceived = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "collector", "bytes"),
"How many bytes have been received (per ident and protocol) (tcp/udp/icmp/other).",
[]string{"ident", "exporter", "proto"}, nil,
)
)
type Exporter struct {
}
func NewExporter() *Exporter {
return &Exporter{
}
} // End of NewExporter
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- uptime
ch <- flowsReceived
ch <- packetsReceived
ch <- bytesReceived
} // End of Describe
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
/*
fmt.Printf("Ident : %s\n", metric.ident)
fmt.Printf("Uptime : %d\n", metric.uptime)
fmt.Printf("Flows tcp : %d\n", metric.numFlows_tcp)
fmt.Printf("Flows udp : %d\n", metric.numFlows_udp)
fmt.Printf("Flows icmp : %d\n", metric.numFlows_icmp)
fmt.Printf("Flows other : %d\n", metric.numFlows_other)
fmt.Printf("Bytes tcp : %d\n", metric.numBytes_tcp)
fmt.Printf("Bytes udp : %d\n", metric.numBytes_udp)
fmt.Printf("Bytes icmp : %d\n", metric.numBytes_icmp)
fmt.Printf("Bytes other : %d\n", metric.numBytes_other)
fmt.Printf("Packets tcp : %d\n", metric.numPackets_tcp)
fmt.Printf("Packets udp : %d\n", metric.numPackets_udp)
fmt.Printf("Packets icmp : %d\n", metric.numPackets_icmp)
fmt.Printf("Packets other : %d\n", metric.numPackets_other)
*/
mutex.Lock()
for ident, metrics := range metricList {
for _, metric := range metrics {
exporterStr := strconv.FormatUint(metric.exporterID, 10)
ch <- prometheus.MustNewConstMetric(flowsReceived, prometheus.CounterValue, float64(metric.numFlows_tcp), ident, exporterStr, "tcp")
ch <- prometheus.MustNewConstMetric(flowsReceived, prometheus.CounterValue, float64(metric.numFlows_udp), ident, exporterStr, "udp")
ch <- prometheus.MustNewConstMetric(flowsReceived, prometheus.CounterValue, float64(metric.numFlows_icmp), ident, exporterStr, "icmp")
ch <- prometheus.MustNewConstMetric(flowsReceived, prometheus.CounterValue, float64(metric.numFlows_other), ident, exporterStr, "other")
// packets
ch <- prometheus.MustNewConstMetric(packetsReceived, prometheus.CounterValue, float64(metric.numPackets_tcp), ident, exporterStr, "tcp")
ch <- prometheus.MustNewConstMetric(packetsReceived, prometheus.CounterValue, float64(metric.numPackets_udp), ident, exporterStr, "udp")
ch <- prometheus.MustNewConstMetric(packetsReceived, prometheus.CounterValue, float64(metric.numPackets_icmp), ident, exporterStr, "icmp")
ch <- prometheus.MustNewConstMetric(packetsReceived, prometheus.CounterValue, float64(metric.numPackets_other), ident, exporterStr, "other")
// bytes
ch <- prometheus.MustNewConstMetric(bytesReceived, prometheus.CounterValue, float64(metric.numBytes_tcp), ident, exporterStr, "tcp")
ch <- prometheus.MustNewConstMetric(bytesReceived, prometheus.CounterValue, float64(metric.numBytes_udp), ident, exporterStr, "udp")
ch <- prometheus.MustNewConstMetric(bytesReceived, prometheus.CounterValue, float64(metric.numPackets_icmp), ident, exporterStr, "icmp")
ch <- prometheus.MustNewConstMetric(bytesReceived, prometheus.CounterValue, float64(metric.numPackets_other), ident, exporterStr, "other")
}
}
mutex.Unlock()
} // End of Collect
// cleanup on signal TERM/cntrl-C
func SetupCloseHandler(socketHandler *socketConf) {
c := make(chan os.Signal)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
fmt.Printf("Exit exporter\n")
socketHandler.Close()
os.Remove(*socketPath)
os.Exit(0)
}()
}
func main() {
flag.Parse()
exporter := NewExporter()
prometheus.MustRegister(exporter)
mutex = new(sync.Mutex)
socketHandler := New(*socketPath)
if err := socketHandler.Open(); err != nil {
log.Fatal("Socket handler failed: ", err)
}
SetupCloseHandler(socketHandler)
socketHandler.Run()
http.Handle(*metricsURI, promhttp.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>NfSen Metric Exporter</title></head>
<body>
<h1>NfSen Metric Exporter</h1>
<p><a href='` + *metricsURI + `'>Metrics</a></p>
</body>
</html>`))
})
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}