TUN-528: Move cloudflared into a separate repo

vendor/github.com/miekg/dns/leak_test.go

@@ -0,0 +1,72 @@
+package dns
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+	"sort"
+	"strings"
+	"testing"
+	"time"
+)
+
+// copied from net/http/main_test.go
+
+func interestingGoroutines() (gs []string) {
+	buf := make([]byte, 2<<20)
+	buf = buf[:runtime.Stack(buf, true)]
+	for _, g := range strings.Split(string(buf), "\n\n") {
+		sl := strings.SplitN(g, "\n", 2)
+		if len(sl) != 2 {
+			continue
+		}
+		stack := strings.TrimSpace(sl[1])
+		if stack == "" ||
+			strings.Contains(stack, "testing.(*M).before.func1") ||
+			strings.Contains(stack, "os/signal.signal_recv") ||
+			strings.Contains(stack, "created by net.startServer") ||
+			strings.Contains(stack, "created by testing.RunTests") ||
+			strings.Contains(stack, "closeWriteAndWait") ||
+			strings.Contains(stack, "testing.Main(") ||
+			strings.Contains(stack, "testing.(*T).Run(") ||
+			strings.Contains(stack, "created by net/http.(*http2Transport).newClientConn") ||
+			// These only show up with GOTRACEBACK=2; Issue 5005 (comment 28)
+			strings.Contains(stack, "runtime.goexit") ||
+			strings.Contains(stack, "created by runtime.gc") ||
+			strings.Contains(stack, "dns.interestingGoroutines") ||
+			strings.Contains(stack, "runtime.MHeap_Scavenger") {
+			continue
+		}
+		gs = append(gs, stack)
+	}
+	sort.Strings(gs)
+	return
+}
+
+func goroutineLeaked() error {
+	if testing.Short() {
+		// Don't worry about goroutine leaks in -short mode or in
+		// benchmark mode. Too distracting when there are false positives.
+		return nil
+	}
+
+	var stackCount map[string]int
+	for i := 0; i < 5; i++ {
+		n := 0
+		stackCount = make(map[string]int)
+		gs := interestingGoroutines()
+		for _, g := range gs {
+			stackCount[g]++
+			n++
+		}
+		if n == 0 {
+			return nil
+		}
+		// Wait for goroutines to schedule and die off:
+		time.Sleep(100 * time.Millisecond)
+	}
+	for stack, count := range stackCount {
+		fmt.Fprintf(os.Stderr, "%d instances of:\n%s\n", count, stack)
+	}
+	return fmt.Errorf("too many goroutines running after dns test(s)")
+}