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ab4b990d51
LinkChangeLogLimiter keeps a subscription to track rate limits for log messages. But when its context ended, it would exit the subscription loop, leaving the subscriber still alive. Ensure the subscriber gets cleaned up when the context ends, so we don't stall event processing. Updates tailscale/corp#34311 Change-Id: I82749e482e9a00dfc47f04afbc69dd0237537cb2 Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>
45 lines
1.3 KiB
Go
45 lines
1.3 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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"context"
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"sync"
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"tailscale.com/types/logger"
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"tailscale.com/util/eventbus"
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)
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// LinkChangeLogLimiter returns a new [logger.Logf] that logs each unique
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// format string to the underlying logger only once per major LinkChange event.
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//
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// The logger stops tracking seen format strings when the provided context is
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// done.
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func LinkChangeLogLimiter(ctx context.Context, logf logger.Logf, nm *Monitor) logger.Logf {
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var formatSeen sync.Map // map[string]bool
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sub := eventbus.SubscribeFunc(nm.b, func(cd ChangeDelta) {
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// If we're in a major change or a time jump, clear the seen map.
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if cd.Major || cd.TimeJumped {
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formatSeen.Clear()
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}
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})
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context.AfterFunc(ctx, sub.Close)
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return func(format string, args ...any) {
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// We only store 'true' in the map, so if it's present then it
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// means we've already logged this format string.
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_, loaded := formatSeen.LoadOrStore(format, true)
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if loaded {
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// TODO(andrew-d): we may still want to log this
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// message every N minutes (1x/hour?) even if it's been
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// seen, so that debugging doesn't require searching
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// back in the logs for an unbounded amount of time.
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//
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// See: https://github.com/tailscale/tailscale/issues/13145
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return
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}
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logf(format, args...)
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}
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}
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