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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(") ||
// 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)")
}
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