Work on #61: Add support for ICMP

+ Update dependencies

vendor/k8s.io/client-go/util/workqueue/parallelizer.go

@@ -0,0 +1,101 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+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 workqueue
+
+import (
+	"context"
+	"sync"
+
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+)
+
+type DoWorkPieceFunc func(piece int)
+
+type options struct {
+	chunkSize int
+}
+
+type Options func(*options)
+
+// WithChunkSize allows to set chunks of work items to the workers, rather than
+// processing one by one.
+// It is recommended to use this option if the number of pieces significantly
+// higher than the number of workers and the work done for each item is small.
+func WithChunkSize(c int) func(*options) {
+	return func(o *options) {
+		o.chunkSize = c
+	}
+}
+
+// ParallelizeUntil is a framework that allows for parallelizing N
+// independent pieces of work until done or the context is canceled.
+func ParallelizeUntil(ctx context.Context, workers, pieces int, doWorkPiece DoWorkPieceFunc, opts ...Options) {
+	if pieces == 0 {
+		return
+	}
+	o := options{}
+	for _, opt := range opts {
+		opt(&o)
+	}
+	chunkSize := o.chunkSize
+	if chunkSize < 1 {
+		chunkSize = 1
+	}
+
+	chunks := ceilDiv(pieces, chunkSize)
+	toProcess := make(chan int, chunks)
+	for i := 0; i < chunks; i++ {
+		toProcess <- i
+	}
+	close(toProcess)
+
+	var stop <-chan struct{}
+	if ctx != nil {
+		stop = ctx.Done()
+	}
+	if chunks < workers {
+		workers = chunks
+	}
+	wg := sync.WaitGroup{}
+	wg.Add(workers)
+	for i := 0; i < workers; i++ {
+		go func() {
+			defer utilruntime.HandleCrash()
+			defer wg.Done()
+			for chunk := range toProcess {
+				start := chunk * chunkSize
+				end := start + chunkSize
+				if end > pieces {
+					end = pieces
+				}
+				for p := start; p < end; p++ {
+					select {
+					case <-stop:
+						return
+					default:
+						doWorkPiece(p)
+					}
+				}
+			}
+		}()
+	}
+	wg.Wait()
+}
+
+func ceilDiv(a, b int) int {
+	return (a + b - 1) / b
+}