telegraf/plugins/inputs/postfix/postfix.go

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package postfix
import (
"fmt"
"os"
"os/exec"
"path/filepath"
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"strings"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
const sampleConfig = `
## Postfix queue directory. If not provided, telegraf will try to use
## 'postconf -h queue_directory' to determine it.
# queue_directory = "/var/spool/postfix"
`
const description = "Measure postfix queue statistics"
func getQueueDirectory() (string, error) {
qd, err := exec.Command("postconf", "-h", "queue_directory").Output()
if err != nil {
return "", err
}
return strings.TrimSpace(string(qd)), nil
}
func qScan(path string, acc telegraf.Accumulator) (int64, int64, int64, error) {
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var length, size int64
var oldest time.Time
err := filepath.Walk(path, func(_ string, finfo os.FileInfo, err error) error {
if err != nil {
acc.AddError(fmt.Errorf("error scanning %s: %s", path, err))
return nil
}
if finfo.IsDir() {
return nil
}
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length++
size += finfo.Size()
ctime := statCTime(finfo.Sys())
if ctime.IsZero() {
return nil
}
if oldest.IsZero() || ctime.Before(oldest) {
oldest = ctime
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}
return nil
})
if err != nil {
return 0, 0, 0, err
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}
var age int64
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if !oldest.IsZero() {
age = int64(time.Now().Sub(oldest) / time.Second)
} else if length != 0 {
// system doesn't support ctime
age = -1
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}
return length, size, age, nil
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}
type Postfix struct {
QueueDirectory string
}
func (p *Postfix) Gather(acc telegraf.Accumulator) error {
if p.QueueDirectory == "" {
var err error
p.QueueDirectory, err = getQueueDirectory()
if err != nil {
return fmt.Errorf("unable to determine queue directory: %s", err)
}
}
for _, q := range []string{"active", "hold", "incoming", "maildrop", "deferred"} {
length, size, age, err := qScan(filepath.Join(p.QueueDirectory, q), acc)
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if err != nil {
acc.AddError(fmt.Errorf("error scanning queue %s: %s", q, err))
continue
}
fields := map[string]interface{}{"length": length, "size": size}
if age != -1 {
fields["age"] = age
}
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acc.AddFields("postfix_queue", fields, map[string]string{"queue": q})
}
return nil
}
func (p *Postfix) SampleConfig() string {
return sampleConfig
}
func (p *Postfix) Description() string {
return description
}
func init() {
inputs.Add("postfix", func() telegraf.Input {
return &Postfix{
QueueDirectory: "/var/spool/postfix",
}
})
}