Adding upstream version 1.34.4.

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

plugins/common/parallel/unordered.go

@@ -0,0 +1,60 @@
+package parallel
+
+import (
+	"sync"
+
+	"github.com/influxdata/telegraf"
+)
+
+type Unordered struct {
+	wg      sync.WaitGroup
+	acc     telegraf.Accumulator
+	fn      func(telegraf.Metric) []telegraf.Metric
+	inQueue chan telegraf.Metric
+}
+
+func NewUnordered(
+	acc telegraf.Accumulator,
+	fn func(telegraf.Metric) []telegraf.Metric,
+	workerCount int,
+) *Unordered {
+	p := &Unordered{
+		acc:     acc,
+		inQueue: make(chan telegraf.Metric, workerCount),
+		fn:      fn,
+	}
+
+	// start workers
+	p.wg.Add(1)
+	go func() {
+		p.startWorkers(workerCount)
+		p.wg.Done()
+	}()
+
+	return p
+}
+
+func (p *Unordered) startWorkers(count int) {
+	wg := sync.WaitGroup{}
+	wg.Add(count)
+	for i := 0; i < count; i++ {
+		go func() {
+			for metric := range p.inQueue {
+				for _, m := range p.fn(metric) {
+					p.acc.AddMetric(m)
+				}
+			}
+			wg.Done()
+		}()
+	}
+	wg.Wait()
+}
+
+func (p *Unordered) Stop() {
+	close(p.inQueue)
+	p.wg.Wait()
+}
+
+func (p *Unordered) Enqueue(m telegraf.Metric) {
+	p.inQueue <- m
+}