Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/postfix/postfix.go

@@ -0,0 +1,114 @@
+//go:generate ../../../tools/readme_config_includer/generator
+//go:build !windows
+
+// postfix doesn't aim for Windows
+
+package postfix
+
+import (
+	_ "embed"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type Postfix struct {
+	QueueDirectory string `toml:"queue_directory"`
+}
+
+func (*Postfix) SampleConfig() string {
+	return sampleConfig
+}
+
+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: %w", err)
+		}
+	}
+
+	for _, q := range []string{"active", "hold", "incoming", "maildrop", "deferred"} {
+		fields, err := qScan(filepath.Join(p.QueueDirectory, q), acc)
+		if err != nil {
+			acc.AddError(fmt.Errorf("error scanning queue %q: %w", q, err))
+			continue
+		}
+
+		acc.AddFields("postfix_queue", fields, map[string]string{"queue": q})
+	}
+
+	return nil
+}
+
+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) (map[string]interface{}, error) {
+	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 %q: %w", path, err))
+			return nil
+		}
+		if finfo.IsDir() {
+			return nil
+		}
+
+		length++
+		size += finfo.Size()
+
+		ctime := statCTime(finfo.Sys())
+		if ctime.IsZero() {
+			return nil
+		}
+		if oldest.IsZero() || ctime.Before(oldest) {
+			oldest = ctime
+		}
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	var age int64
+	if !oldest.IsZero() {
+		age = int64(time.Since(oldest) / time.Second)
+	} else if length != 0 {
+		// system doesn't support ctime
+		age = -1
+	}
+
+	fields := map[string]interface{}{"length": length, "size": size}
+	if age != -1 {
+		fields["age"] = age
+	}
+
+	return fields, nil
+}
+
+func init() {
+	inputs.Add("postfix", func() telegraf.Input {
+		return &Postfix{
+			QueueDirectory: "/var/spool/postfix",
+		}
+	})
+}