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f991c8a61f
To find potential flakes earlier. Updates #deflake-effort Change-Id: I52add6111d660821c3a23d4b1dd032821344bc48 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package tstest
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import (
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"bytes"
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"runtime"
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"runtime/pprof"
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"testing"
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"time"
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"github.com/google/go-cmp/cmp"
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)
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// ResourceCheck takes a snapshot of the current goroutines and registers a
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// cleanup on tb to verify that after the rest, all goroutines created by the
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// test go away. (well, at least that the count matches. Maybe in the future it
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// can look at specific routines).
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//
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// It panics if called from a parallel test.
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func ResourceCheck(tb testing.TB) {
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tb.Helper()
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// Set an environment variable (anything at all) just for the
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// side effect of tb.Setenv panicking if we're in a parallel test.
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tb.Setenv("TS_CHECKING_RESOURCES", "1")
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startN, startStacks := goroutines()
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tb.Cleanup(func() {
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if tb.Failed() {
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// Something else went wrong.
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return
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}
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// Goroutines might be still exiting.
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for i := 0; i < 300; i++ {
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if runtime.NumGoroutine() <= startN {
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return
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}
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time.Sleep(10 * time.Millisecond)
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}
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endN, endStacks := goroutines()
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if endN <= startN {
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return
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}
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tb.Logf("goroutine diff:\n%v\n", cmp.Diff(startStacks, endStacks))
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tb.Fatalf("goroutine count: expected %d, got %d\n", startN, endN)
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})
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}
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func goroutines() (int, []byte) {
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p := pprof.Lookup("goroutine")
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b := new(bytes.Buffer)
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p.WriteTo(b, 1)
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return p.Count(), b.Bytes()
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}
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