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wgengine/filter: add a debug flag for filter logs (#2241) 

This uses a debug envvar to optionally disable filter logging rate
limits by setting the environment variable
TS_DEBUG_FILTER_RATE_LIMIT_LOGS to "all", and if it matches,
the code will effectively disable the limits on the log rate by
setting the limit to 1 millisecond. This should make sure that all
filter logs will be captured.

Signed-off-by: Christine Dodrill <xe@tailscale.com>
This commit is contained in:
Christine Dodrill 2021-06-25 10:10:26 -04:00 committed by GitHub
parent 80b1308974
commit 59e9b44f53
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1 changed files with 14 additions and 0 deletions
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14
wgengine/filter/filter.go
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@ -7,6 +7,7 @@ package filter
import (
"fmt"
"os"
"sync"
"time"
@ -217,6 +218,19 @@ func maybeHexdump(flag RunFlags, b []byte) string {
var acceptBucket = rate.NewLimiter(rate.Every(10*time.Second), 3)
var dropBucket = rate.NewLimiter(rate.Every(5*time.Second), 10)
// NOTE(Xe): This func init is used to detect
// TS_DEBUG_FILTER_RATE_LIMIT_LOGS=all, and if it matches, to
// 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" {
return
}
acceptBucket = rate.NewLimiter(rate.Every(time.Millisecond), 10)
dropBucket = rate.NewLimiter(rate.Every(time.Millisecond), 10)
}
func (f *Filter) logRateLimit(runflags RunFlags, q *packet.Parsed, dir direction, r Response, why string) {
if !f.loggingAllowed(q) {
return