EN: Don't scan persistently (4663d610) · Commits · e / os / GmsCore

play-services-nearby-core/src/main/kotlin/org/microg/gms/nearby/exposurenotification/Constants.kt

+5 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,11 @@ import java.util.*
		const val TAG = "ExposureNotification"
		val SERVICE_UUID = ParcelUuid(UUID.fromString("0000FD6F-0000-1000-8000-00805F9B34FB"))

		const val SCANNING_INTERVAL = 3 * 60 // Google uses 5m, but we use a slightly different scanning and reporting system
		const val SCANNING_INTERVAL_MS = SCANNING_INTERVAL * 1000L
		const val SCANNING_TIME = 20 // Google uses 4s + 13s (if Bluetooth is used by something else)
		const val SCANNING_TIME_MS = SCANNING_TIME * 1000L

		const val ROLLING_WINDOW_LENGTH = 10 * 60
		const val ROLLING_WINDOW_LENGTH_MS = ROLLING_WINDOW_LENGTH * 1000
		const val ROLLING_PERIOD = 144

play-services-nearby-core/src/main/kotlin/org/microg/gms/nearby/exposurenotification/ScannerService.kt

+26 −12

Original line number	Diff line number	Diff line
		@@ -14,7 +14,9 @@ import android.content.Context
		import android.content.Intent
		import android.content.IntentFilter
		import android.os.Build
		import android.os.Handler
		import android.os.IBinder
		import android.os.Looper
		import android.util.Log
		import org.microg.gms.common.ForegroundServiceContext
		import java.io.FileDescriptor
		@@ -23,8 +25,8 @@ import java.util.*

		@TargetApi(21)
		class ScannerService : Service() {
		private var started = false
		private var startTime = 0L
		private var scanning = false
		private var lastStartTime = 0L
		private var seenAdvertisements = 0L
		private var lastAdvertisement = 0L
		private lateinit var database: ExposureDatabase
		@@ -55,6 +57,9 @@ class ScannerService : Service() {
		}
		}
		}
		private val handler = Handler(Looper.getMainLooper())
		private val stopLaterRunnable = Runnable { stopScan() }
		private val startLaterRunnable = Runnable { startScan() }

		private val scanner: BluetoothLeScanner?
		get() = getDefaultAdapter()?.bluetoothLeScanner
		@@ -101,9 +106,11 @@ class ScannerService : Service() {

		@Synchronized
		private fun startScan() {
		if (started) return
		if (scanning) return
		val scanner = scanner ?: return
		Log.d(TAG, "Starting scanner for service $SERVICE_UUID")
		handler.removeCallbacks(startLaterRunnable)
		seenAdvertisements = 0
		scanner.startScan(
		listOf(ScanFilter.Builder()
		.setServiceUuid(SERVICE_UUID)
		@@ -114,25 +121,32 @@ class ScannerService : Service() {
		.build(),
		callback
		)
		started = true
		startTime = System.currentTimeMillis()
		scanning = true
		lastStartTime = System.currentTimeMillis()
		handler.postDelayed(stopLaterRunnable, SCANNING_TIME_MS)
		}

		@Synchronized
		private fun stopScan() {
		if (!started) return
		if (!scanning) return
		Log.d(TAG, "Stopping scanner for service $SERVICE_UUID")
		started = false
		handler.removeCallbacks(stopLaterRunnable)
		scanning = false
		scanner?.stopScan(callback)
		if (ExposurePreferences(this).enabled) {
		handler.postDelayed(startLaterRunnable, ((lastStartTime + SCANNING_INTERVAL_MS) - System.currentTimeMillis()).coerceIn(0, SCANNING_INTERVAL_MS))
		}
		}

		override fun dump(fd: FileDescriptor?, writer: PrintWriter?, args: Array<out String>?) {
		writer?.println("Started: $started")
		if (started) {
		writer?.println("Since ${Date(startTime)}")
		writer?.println("Seen advertisements: $seenAdvertisements")
		writer?.println("Last advertisement: ${Date(lastAdvertisement)}")
		}
		writer?.println("Scanning now: $scanning")
		writer?.println("Last scan start: ${Date(lastStartTime)}")
		if (Build.VERSION.SDK_INT >= 29) {
		writer?.println("Scan start pending: ${handler.hasCallbacks(startLaterRunnable)}")
		writer?.println("Scan stop pending: ${handler.hasCallbacks(stopLaterRunnable)}")
		}
		writer?.println("Seen advertisements since last scan start: $seenAdvertisements")
		writer?.println("Last advertisement seen: ${Date(lastAdvertisement)}")
		}

		companion object {