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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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5
net/dnscache/dnscache.go
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@ -15,14 +15,13 @@ import (
"fmt"
"log"
"net"
"os"
"runtime"
"strconv"
"sync"
"time"
"golang.org/x/sync/singleflight"
"inet.af/netaddr"
"tailscale.com/envknob"
)
var single = &Resolver{
@ -100,7 +99,7 @@ func (r *Resolver) ttl() time.Duration {
return 10 * time.Minute
}
var debug, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DNS_CACHE"))
var debug = envknob.Bool("TS_DEBUG_DNS_CACHE")
// LookupIP returns the host's primary IP address (either IPv4 or
// IPv6, but preferring IPv4) and optionally its IPv6 address, if