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envknob: support changing envknobs post-init

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Updates #5114

Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-14 12:49:39 -07:00
committed by Brad Fitzpatrick
parent 33ee2c058e
commit 74674b110d
31 changed files with 311 additions and 167 deletions
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4
types/logger/logger.go
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@@ -129,8 +129,6 @@ type limitData struct {
ele *list.Element // list element used to access this string in the cache
}
var disableRateLimit = envknob.String("TS_DEBUG_LOG_RATE") == "all"
// rateFree are format string substrings that are exempt from rate limiting.
// Things should not be added to this unless they're already limited otherwise
// or are critical for generating important stats from the logs.
@@ -156,7 +154,7 @@ func RateLimitedFn(logf Logf, f time.Duration, burst int, maxCache int) Logf {
// timeNow is a function that returns the current time, used for calculating
// rate limits.
func RateLimitedFnWithClock(logf Logf, f time.Duration, burst int, maxCache int, timeNow func() time.Time) Logf {
if disableRateLimit {
if envknob.String("TS_DEBUG_LOG_RATE") == "all" {
return logf
}
var (