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43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
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// 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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"sync"
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"tailscale.com/types/logger"
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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 returned function should be called when the logger is no longer needed,
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// to release resources from the Monitor.
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func LinkChangeLogLimiter(logf logger.Logf, nm *Monitor) (_ logger.Logf, unregister func()) {
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var formatSeen sync.Map // map[string]bool
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unregister = nm.RegisterChangeCallback(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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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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}, unregister
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}
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