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Check in an initial copy of our Postfix metrics exporter.

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Ed Schouten 2017-02-17 15:29:37 +01:00
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postfix_exporter

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// Copyright 2017 Kumina, https://kumina.nl/
// 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.
package main
import (
"bufio"
"flag"
"io"
"log"
"net"
"net/http"
"os"
"regexp"
"strconv"
"time"
"github.com/prometheus/client_golang/prometheus"
)
var (
postfixUpDesc = prometheus.NewDesc(
prometheus.BuildFQName("unbound", "", "up"),
"Whether scraping Postfix's metrics was successful.",
nil, nil)
)
func CollectShowqFromReader(file io.Reader, ch chan<- prometheus.Metric) error {
scanner := bufio.NewScanner(file)
scanner.Split(bufio.ScanLines)
// Regular expression for matching postqueue's output. Example:
// "A07A81514 5156 Tue Feb 14 13:13:54 MAILER-DAEMON"
messageLine := regexp.MustCompile("^[0-9A-F]+ +(\\d+) (\\w{3} \\w{3} +\\d+ +\\d+:\\d{2}:\\d{2}) +")
// Histograms tracking the messages by size and age.
sizeHistogram := prometheus.NewHistogram(
prometheus.HistogramOpts{
Namespace: "unbound",
Name: "queue_message_size_bytes",
Help: "Size of messages in Postfix's message queue, in bytes",
Buckets: []float64{1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9},
})
ageHistogram := prometheus.NewHistogram(
prometheus.HistogramOpts{
Namespace: "unbound",
Name: "queue_message_age_seconds",
Help: "Age of messages in Postfix's message queue, in seconds",
Buckets: []float64{1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8},
})
now := time.Now()
for scanner.Scan() {
matches := messageLine.FindStringSubmatch(scanner.Text())
if matches != nil {
// Parse the message size.
size, err := strconv.ParseFloat(matches[1], 64)
if err != nil {
return err
}
// Parse the message date. Unfortunately, the
// output contains no year number. Assume it
// applies to the last year for which the
// message date doesn't exceed time.Now().
date, err := time.Parse("Mon Jan 2 15:04:05", matches[2])
if err != nil {
return err
}
date = date.AddDate(now.Year(), 0, 0)
if date.After(now) {
date.AddDate(-1, 0, 0)
}
sizeHistogram.Observe(size)
ageHistogram.Observe(now.Sub(date).Seconds())
}
}
ch <- sizeHistogram
ch <- ageHistogram
return scanner.Err()
}
func CollectShowqFromFile(path string, ch chan<- prometheus.Metric) error {
conn, err := os.Open(path)
if err != nil {
return err
}
return CollectShowqFromReader(conn, ch)
}
func CollectShowqFromSocket(path string, ch chan<- prometheus.Metric) error {
conn, err := net.Dial("unix", path)
if err != nil {
return err
}
return CollectShowqFromReader(conn, ch)
}
type PostfixExporter struct {
showqPath string
}
func NewPostfixExporter(showqPath string) (*PostfixExporter, error) {
return &PostfixExporter{
showqPath: showqPath,
}, nil
}
func (e *PostfixExporter) Describe(ch chan<- *prometheus.Desc) {
ch <- postfixUpDesc
}
func (e *PostfixExporter) Collect(ch chan<- prometheus.Metric) {
err := CollectShowqFromSocket(e.showqPath, ch)
if err == nil {
ch <- prometheus.MustNewConstMetric(
postfixUpDesc,
prometheus.GaugeValue,
1.0)
} else {
log.Printf("Failed to scrape showq socket: %s", err)
ch <- prometheus.MustNewConstMetric(
postfixUpDesc,
prometheus.GaugeValue,
0.0)
}
}
func main() {
var (
listenAddress = flag.String("web.listen-address", ":12345", "Address to listen on for web interface and telemetry.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
postfixShowqPath = flag.String("postfix.showq_path", "/var/spool/postfix/public/showq", "Path at which Postfix places its showq socket.")
)
flag.Parse()
exporter, err := NewPostfixExporter(*postfixShowqPath)
if err != nil {
panic(err)
}
prometheus.MustRegister(exporter)
http.Handle(*metricsPath, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`
<html>
<head><title>Postfix Exporter</title></head>
<body>
<h1>Postfix Exporter</h1>
<p><a href='` + *metricsPath + `'>Metrics</a></p>
</body>
</html>`))
})
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}