viktor/infra
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 3

android-emulator: sleep after 6h idle (activity-based), fix never-sleeping
All checks were successful
ci/woodpecker/push/default Pipeline was successful
Details

Browse source 
The emulator was meant to scale to zero when idle but had been up 6+ days
straight despite ~5 days with no real use. Two bugs:

1. The idle check counted ESTABLISHED TCP connections to the adb/noVNC
   ports. A forgotten `adb connect` (no disconnect) holds that transport
   open forever, so every 15-min run saw "active" and reset the counter --
   it never reached the sleep branch. (Right now: 4 such stale transports
   from pods on k8s-node3/node4.)
2. Even when it did reach the sleep branch, `kubectl scale --replicas=0`
   failed Forbidden -- the gate ServiceAccount can patch `deployments` but
   not `deployments/scale`.

Switch the sleeper to measure actual use: time since last user activity
(taps/keys/app-launches, incl. noVNC clicks) from `dumpsys power` vs guest
uptime. No interaction for 6h -> sleep. This ignores idle/forgotten
connections entirely. Scale down with a direct replicas patch on the named
deployment (same path the wake gate scales up), so it needs only the
existing `deployments` patch grant -- no `deployments/scale`. Now stateless
(drops the idle-counter annotation; gate.py no longer sets it) and lighter
on etcd. Fail-safe: any read error (e.g. mid-boot) does not sleep.

Requested by Viktor: turn the dev-only emulator off when it hasn't been
used for 6h.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Viktor Barzin 2026-06-24 08:49:23 +00:00
parent 566447a698
commit 839fdb33c2
3 changed files with 44 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

10
stacks/android-emulator/gate.py
View file

@ -22,7 +22,6 @@ API = "https://%s:%s" % (
)
TOKEN_PATH = "/var/run/secrets/kubernetes.io/serviceaccount/token"
CA_PATH = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
IDLE_ANNOTATION = "emulator.viktorbarzin.me/idle-checks"
VNC_PATH = "/vnc.html?autoconnect=1&resize=scale"
WAKING_PAGE = """<!doctype html><html><head><title>Android emulator</title>
@ -57,13 +56,14 @@ def deployment_state():
def wake():
# Direct replicas patch on the named deployment — same path the idle
# sleeper uses to scale DOWN; needs only `deployments` patch, not
# `deployments/scale`. Idle is now measured from dumpsys power, so there
# is no idle-counter annotation to reset here.
kube(
"PATCH",
f"/apis/apps/v1/namespaces/{NS}/deployments/{DEPLOY}",
{
"spec": {"replicas": 1},
"metadata": {"annotations": {IDLE_ANNOTATION: "0"}},
},
{"spec": {"replicas": 1}},
)