TUN-1350: Enhance error messages with cloudflarestatus.com link, if relevant

vendor/github.com/cloudflare/golibs/lrucache/priorityqueue.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2013 CloudFlare, Inc.
+
+// This code is based on golang example from "container/heap" package.
+
+package lrucache
+
+type priorityQueue []*entry
+
+func (pq priorityQueue) Len() int {
+	return len(pq)
+}
+
+func (pq priorityQueue) Less(i, j int) bool {
+	return pq[i].expire.Before(pq[j].expire)
+}
+
+func (pq priorityQueue) Swap(i, j int) {
+	pq[i], pq[j] = pq[j], pq[i]
+	pq[i].index = i
+	pq[j].index = j
+}
+
+func (pq *priorityQueue) Push(e interface{}) {
+	n := len(*pq)
+	item := e.(*entry)
+	item.index = n
+	*pq = append(*pq, item)
+}
+
+func (pq *priorityQueue) Pop() interface{} {
+	old := *pq
+	n := len(old)
+	item := old[n-1]
+	item.index = -1
+	*pq = old[0 : n-1]
+	return item
+}