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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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24
wgengine/magicsock/debugknobs.go
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@@ -8,8 +8,7 @@
package magicsock
import (
"os"
"strconv"
"tailscale.com/envknob"
)
// Various debugging and experimental tweakables, set by environment
@@ -17,25 +16,23 @@ import (
var (
// debugDisco prints verbose logs of active discovery events as
// they happen.
debugDisco, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DISCO"))
debugDisco = envknob.Bool("TS_DEBUG_DISCO")
// debugOmitLocalAddresses removes all local interface addresses
// from magicsock's discovered local endpoints. Used in some tests.
debugOmitLocalAddresses, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_OMIT_LOCAL_ADDRS"))
debugOmitLocalAddresses = envknob.Bool("TS_DEBUG_OMIT_LOCAL_ADDRS")
// debugUseDerpRoute temporarily (2020-03-22) controls whether DERP
// reverse routing is enabled (Issue 150). It will become always true
// later.
debugUseDerpRouteEnv = os.Getenv("TS_DEBUG_ENABLE_DERP_ROUTE")
debugUseDerpRoute, _ = strconv.ParseBool(debugUseDerpRouteEnv)
// reverse routing is enabled (Issue 150).
debugUseDerpRoute = envknob.OptBool("TS_DEBUG_ENABLE_DERP_ROUTE")
// logDerpVerbose logs all received DERP packets, including their
// full payload.
logDerpVerbose, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DERP"))
logDerpVerbose = envknob.Bool("TS_DEBUG_DERP")
// debugReSTUNStopOnIdle unconditionally enables the "shut down
// STUN if magicsock is idle" behavior that normally only triggers
// on mobile devices, lowers the shutdown interval, and logs more
// verbosely about idle measurements.
debugReSTUNStopOnIdle, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_RESTUN_STOP_ON_IDLE"))
debugReSTUNStopOnIdle = envknob.Bool("TS_DEBUG_RESTUN_STOP_ON_IDLE")
// debugAlwaysDERP disables the use of UDP, forcing all peer communication over DERP.
debugAlwaysDERP, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_ALWAYS_USE_DERP"))
debugAlwaysDERP = envknob.Bool("TS_DEBUG_ALWAYS_USE_DERP")
)
// inTest reports whether the running program is a test that set the
@@ -44,7 +41,4 @@ var (
// Unlike the other debug tweakables above, this one needs to be
// checked every time at runtime, because tests set this after program
// startup.
func inTest() bool {
inTest, _ := strconv.ParseBool(os.Getenv("IN_TS_TEST"))
return inTest
}
func inTest() bool { return envknob.Bool("IN_TS_TEST") }