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envknob: add new package for all the strconv.ParseBool(os.Getenv(..))

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A new package can also later record/report which knobs are checked and
set. It also makes the code cleaner & easier to grep for env knobs.

Change-Id: Id8a123ab7539f1fadbd27e0cbeac79c2e4f09751
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-01-24 10:52:57 -08:00
committed by Brad Fitzpatrick
parent 6feb8f4c51
commit 41fd4eab5c
39 changed files with 195 additions and 128 deletions
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4
wgengine/filter/filter.go
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@@ -7,11 +7,11 @@ package filter
import (
"fmt"
"os"
"sync"
"time"
"inet.af/netaddr"
"tailscale.com/envknob"
"tailscale.com/net/flowtrack"
"tailscale.com/net/packet"
"tailscale.com/tstime/rate"
@@ -225,7 +225,7 @@ var dropBucket = rate.NewLimiter(rate.Every(5*time.Second), 10)
// effectively disable the limits on the log rate by setting the limit
// to 1 millisecond. This should capture everything.
func init() {
if os.Getenv("TS_DEBUG_FILTER_RATE_LIMIT_LOGS") != "all" {
if envknob.String("TS_DEBUG_FILTER_RATE_LIMIT_LOGS") != "all" {
return
}