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monitor/polling: reduce Cloud Run polling interval.

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Cloud Run's routes never change at runtime. Don't poll it for
route changes very often.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry 2021-04-02 00:24:29 -07:00 committed by Denton Gentry
parent 224e60cef2
commit 3089081349
1 changed files with 22 additions and 2 deletions
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24
wgengine/monitor/polling.go
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@ -7,7 +7,9 @@
package monitor
import (
"bytes"
"errors"
"os"
"runtime"
"sync"
"time"
@ -42,6 +44,20 @@ func (pm *pollingMon) Close() error {
return nil
}
func (pm *pollingMon) isCloudRun() bool {
// https: //cloud.google.com/run/docs/reference/container-contract#env-vars
if os.Getenv("K_REVISION") == "" || os.Getenv("K_CONFIGURATION") == "" ||
os.Getenv("K_SERVICE") == "" || os.Getenv("PORT") == "" {
return false
}
vers, err := os.ReadFile("/proc/version")
if err != nil {
pm.logf("Failed to read /proc/version: %v", err)
return false
}
return string(bytes.TrimSpace(vers)) == "Linux version 4.4.0 #1 SMP Sun Jan 10 15:06:54 PST 2016"
}
func (pm *pollingMon) Receive() (message, error) {
d := 10 * time.Second
if runtime.GOOS == "android" {
@ -50,8 +66,12 @@ func (pm *pollingMon) Receive() (message, error) {
// https://github.com/tailscale/tailscale/issues/1427
d = 10 * time.Minute
}
// TODO: detect if we're running in Cloud Run, and reduce frequency of
// polling as its routes never change.
if pm.isCloudRun() {
// Cloud Run routes never change at runtime. the containers are killed within
// 15 minutes by default, set the interval long enough to be effectively infinite.
pm.logf("monitor polling: Cloud Run detected, reduce polling interval to 24h")
d = 24 * time.Hour
}
ticker := time.NewTicker(d)
defer ticker.Stop()
base := pm.m.InterfaceState()