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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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28
control/controlclient/direct.go
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@@ -21,7 +21,6 @@ import (
"os/exec"
"reflect"
"runtime"
"strconv"
"strings"
"sync"
"sync/atomic"
@@ -30,6 +29,7 @@ import (
"go4.org/mem"
"inet.af/netaddr"
"tailscale.com/control/controlknobs"
"tailscale.com/envknob"
"tailscale.com/health"
"tailscale.com/hostinfo"
"tailscale.com/ipn/ipnstate"
@@ -874,8 +874,8 @@ func decode(res *http.Response, v interface{}, serverKey key.MachinePublic, mkey
}
var (
debugMap, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_MAP"))
debugRegister, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_REGISTER"))
debugMap = envknob.Bool("TS_DEBUG_MAP")
debugRegister = envknob.Bool("TS_DEBUG_REGISTER")
)
var jsonEscapedZero = []byte(`\u0000`)
@@ -985,26 +985,14 @@ type debug struct {
func initDebug() debug {
return debug{
NetMap: envBool("TS_DEBUG_NETMAP"),
ProxyDNS: envBool("TS_DEBUG_PROXY_DNS"),
StripEndpoints: envBool("TS_DEBUG_STRIP_ENDPOINTS"),
StripCaps: envBool("TS_DEBUG_STRIP_CAPS"),
Disco: os.Getenv("TS_DEBUG_USE_DISCO") == "" || envBool("TS_DEBUG_USE_DISCO"),
NetMap: envknob.Bool("TS_DEBUG_NETMAP"),
ProxyDNS: envknob.Bool("TS_DEBUG_PROXY_DNS"),
StripEndpoints: envknob.Bool("TS_DEBUG_STRIP_ENDPOINTS"),
StripCaps: envknob.Bool("TS_DEBUG_STRIP_CAPS"),
Disco: envknob.BoolDefaultTrue("TS_DEBUG_USE_DISCO"),
}
}
func envBool(k string) bool {
e := os.Getenv(k)
if e == "" {
return false
}
v, err := strconv.ParseBool(e)
if err != nil {
panic(fmt.Sprintf("invalid non-bool %q for env var %q", e, k))
}
return v
}
var clockNow = time.Now
// opt.Bool configs from control.