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Disconnect a network if it's suspended for 5 minutes for wear

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The suspension state is designed to be a transient state. Implement an
enforcement to disconnect the network after staying at this state for 5
minutes. This can avoid apps unnecessarily waking up the device for
network activities even when there's no network actually connected.

Test: unit tests. Locally tested with a signal blocking bag.
Bug: 404570281
Flag: EXEMPT mainline
Change-Id: I1427a72402f7ec64eda537a89c86768466a72328
This commit is contained in:
Hongyi Zhang 2025-05-29 00:31:08 +00:00
commit 3dcb3c5890
1 changed files with 157 additions and 0 deletions
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47
service/src/com/android/server/ConnectivityService.java
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@ -507,6 +507,9 @@ public class ConnectivityService extends IConnectivityManager.Stub
private static final int ACTIVELY_PREFER_BAD_WIFI_INITIAL_TIMEOUT_MS = 20 * 1000;
// Timeout in case the "actively prefer bad wifi" feature is off
private static final int DEFAULT_EVALUATION_TIMEOUT_MS = 8 * 1000;
// Timeout threshold on how long a network is allowed to stay at SUSPENDED state. When the
// timeout is reached, the network will be torn down.
private static final int DEFAULT_NETWORK_SUSPENDED_TIMEOUT_MS = 5 * 60 * 1000;
// Default to 30s linger time-out, and 5s for nascent network. Modifiable only for testing.
private static final String LINGER_DELAY_PROPERTY = "persist.netmon.linger";
@ -978,6 +981,12 @@ public class ConnectivityService extends IConnectivityManager.Stub
*/
private static final int EVENT_CLEAR_FIREWALL_DESTROY_SOCKET_REASONS = 63;
/**
* indicates a timeout period to wait for the network leaving suspended state is over.
* The network should be torn down now.
*/
private static final int EVENT_TIMEOUT_NETWORK_SUSPENDED = 64;
/**
* Argument for {@link #EVENT_PROVISIONING_NOTIFICATION} to indicate that the notification
* should be shown.
@ -1760,6 +1769,21 @@ public class ConnectivityService extends IConnectivityManager.Stub
WIFI_DATA_INACTIVITY_TIMEOUT, 15);
}
/** Returns the timeout duration for a network to stay in SUSPENDED state before being torn
* down.
*/
public int getNetworkSuspendedTimeoutMs() {
return DEFAULT_NETWORK_SUSPENDED_TIMEOUT_MS;
}
/**
* Whether the enforcement of short network suspension duration should be enabled.
*/
public boolean isShortNetworkSuspensionEnforced(Context context) {
// The feature is only enabled on watch for now. See b/422119228 for details.
return context.getPackageManager().hasSystemFeature(FEATURE_WATCH);
}
/**
* @see DeviceConfigUtils#isTetheringFeatureEnabled
*/
@ -3757,6 +3781,11 @@ public class ConnectivityService extends IConnectivityManager.Stub
}
}
private void handleNetwokSuspendedTimeout(NetworkAgentInfo nai) {
// Tear down the network if it has stayed in SUSPENDED state for longer than intended.
disconnectAndDestroyNetwork(nai);
}
private void handleFreezeNetworkCallbacks(int[] uids, int[] frozenStates) {
if (!mQueueCallbacksForFrozenApps) {
return;
@ -5833,6 +5862,12 @@ public class ConnectivityService extends IConnectivityManager.Stub
}
nai.networkMonitor().notifyNetworkDisconnected();
mNetworkAgentInfos.remove(nai);
if (mDeps.isShortNetworkSuspensionEnforced(mContext)) {
// Remove the message to disconnect the network if it's in suspended state for too long,
// this is to allow the system to reclaim the memory associated with this NAI earlier,
// rather than unnecessarily waiting for the timeout period.
mHandler.removeMessages(EVENT_TIMEOUT_NETWORK_SUSPENDED, nai);
}
nai.clatd.update();
synchronized (mNetworkForNetId) {
// Remove the NetworkAgent, but don't mark the netId as
@ -7347,6 +7382,9 @@ public class ConnectivityService extends IConnectivityManager.Stub
case EVENT_CLEAR_FIREWALL_DESTROY_SOCKET_REASONS:
handleClearFirewallDestroySocketReasons(msg.arg1);
break;
case EVENT_TIMEOUT_NETWORK_SUSPENDED:
handleNetwokSuspendedTimeout((NetworkAgentInfo) msg.obj);
break;
}
}
}
@ -10912,6 +10950,15 @@ public class ConnectivityService extends IConnectivityManager.Stub
// TODO (b/73132094) : remove this call once the few users of onSuspended and
// onResumed have been removed.
notifyNetworkCallbacks(nai, suspended ? CALLBACK_SUSPENDED : CALLBACK_RESUMED);
if (mDeps.isShortNetworkSuspensionEnforced(mContext)) {
if (suspended) {
mHandler.sendMessageDelayed(
mHandler.obtainMessage(EVENT_TIMEOUT_NETWORK_SUSPENDED,
nai), mDeps.getNetworkSuspendedTimeoutMs());
} else {
mHandler.removeMessages(EVENT_TIMEOUT_NETWORK_SUSPENDED, nai);
}
}
}
if (prevSuspended != suspended || prevRoaming != roaming) {
// updateNetworkInfo will mix in the suspended info from the capabilities and