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https://github.com/tailscale/tailscale.git
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8b48f3847d
Remove the need for the caller to hold on to and call an unregister function. Both two callers (one real, one test) already have a context they can use. Use context.AfterFunc instead. There are no observable side effects from scheduling too late if the goroutine doesn't run sync. Updates #17148 Change-Id: Ie697dae0e797494fa8ef27fbafa193bfe5ceb307 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package netmon
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import (
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"bytes"
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"context"
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"fmt"
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"testing"
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"testing/synctest"
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"tailscale.com/util/eventbus"
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)
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func TestLinkChangeLogLimiter(t *testing.T) { synctest.Test(t, syncTestLinkChangeLogLimiter) }
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func syncTestLinkChangeLogLimiter(t *testing.T) {
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bus := eventbus.New()
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defer bus.Close()
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mon, err := New(bus, t.Logf)
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if err != nil {
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t.Fatal(err)
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}
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defer mon.Close()
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var logBuffer bytes.Buffer
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logf := func(format string, args ...any) {
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t.Logf("captured log: "+format, args...)
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if format[len(format)-1] != '\n' {
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format += "\n"
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}
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fmt.Fprintf(&logBuffer, format, args...)
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}
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ctx, cancel := context.WithCancel(t.Context())
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defer cancel()
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logf = LinkChangeLogLimiter(ctx, logf, mon)
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// Log once, which should write to our log buffer.
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logf("hello %s", "world")
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if got := logBuffer.String(); got != "hello world\n" {
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t.Errorf("unexpected log buffer contents: %q", got)
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}
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// Log again, which should not write to our log buffer.
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logf("hello %s", "andrew")
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if got := logBuffer.String(); got != "hello world\n" {
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t.Errorf("unexpected log buffer contents: %q", got)
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}
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// Log a different message, which should write to our log buffer.
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logf("other message")
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if got := logBuffer.String(); got != "hello world\nother message\n" {
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t.Errorf("unexpected log buffer contents: %q", got)
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}
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// Synthesize a fake major change event, which should clear the format
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// string cache and allow the next log to write to our log buffer.
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//
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// InjectEvent doesn't work because it's not a major event, so we
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// instead reach into the netmon and grab the callback, and then call
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// it ourselves.
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mon.mu.Lock()
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var cb func(*ChangeDelta)
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for _, c := range mon.cbs {
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cb = c
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break
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}
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mon.mu.Unlock()
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cb(&ChangeDelta{Major: true})
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logf("hello %s", "world")
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if got := logBuffer.String(); got != "hello world\nother message\nhello world\n" {
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t.Errorf("unexpected log buffer contents: %q", got)
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}
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// Canceling the context we passed to LinkChangeLogLimiter should
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// unregister the callback from the netmon.
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cancel()
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synctest.Wait()
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mon.mu.Lock()
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if len(mon.cbs) != 0 {
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t.Errorf("expected no callbacks, got %v", mon.cbs)
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}
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mon.mu.Unlock()
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}
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