/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.appbinding;
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import android.content.Context;
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import android.util.KeyValueListParser;
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import android.util.Slog;
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import java.io.PrintWriter;
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import java.util.concurrent.TimeUnit;
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/**
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* Constants that are configurable via the global settings for {@link AppBindingService}.
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*/
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public class AppBindingConstants {
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private static final String TAG = AppBindingService.TAG;
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private static final String SERVICE_RECONNECT_BACKOFF_SEC_KEY =
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"service_reconnect_backoff_sec";
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private static final String SERVICE_RECONNECT_BACKOFF_INCREASE_KEY =
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"service_reconnect_backoff_increase";
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private static final String SERVICE_RECONNECT_MAX_BACKOFF_SEC_KEY =
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"service_reconnect_max_backoff_sec";
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private static final String SERVICE_STABLE_CONNECTION_THRESHOLD_SEC_KEY =
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"service_stable_connection_threshold_sec";
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private static final String SMS_SERVICE_ENABLED_KEY =
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"sms_service_enabled";
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private static final String SMS_APP_BIND_FLAGS_KEY =
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"sms_app_bind_flags";
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public final String sourceSettings;
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/**
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* The back-off before re-connecting, when a service binding died, due to the app
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* crashing repeatedly.
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*/
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public final long SERVICE_RECONNECT_BACKOFF_SEC;
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/**
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* The exponential back-off increase factor when a binding dies multiple times.
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*/
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public final double SERVICE_RECONNECT_BACKOFF_INCREASE;
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/**
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* The max back-off
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*/
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public final long SERVICE_RECONNECT_MAX_BACKOFF_SEC;
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/**
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* If a connection lasts more than this duration, we reset the re-connect back-off time.
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*/
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public final long SERVICE_STABLE_CONNECTION_THRESHOLD_SEC;
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/**
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* Whether to actually bind to the default SMS app service. (Feature flag)
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*/
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public final boolean SMS_SERVICE_ENABLED;
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/**
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* Extra binding flags for SMS service.
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*/
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public final int SMS_APP_BIND_FLAGS;
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private AppBindingConstants(String settings) {
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sourceSettings = settings;
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final KeyValueListParser parser = new KeyValueListParser(',');
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try {
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parser.setString(settings);
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} catch (IllegalArgumentException e) {
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// Failed to parse the settings string, log this and move on
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// with defaults.
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Slog.e(TAG, "Bad setting: " + settings);
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}
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long serviceReconnectBackoffSec = parser.getLong(
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SERVICE_RECONNECT_BACKOFF_SEC_KEY, 10);
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double serviceReconnectBackoffIncrease = parser.getFloat(
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SERVICE_RECONNECT_BACKOFF_INCREASE_KEY, 2f);
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long serviceReconnectMaxBackoffSec = parser.getLong(
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SERVICE_RECONNECT_MAX_BACKOFF_SEC_KEY, TimeUnit.HOURS.toSeconds(1));
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boolean smsServiceEnabled = parser.getBoolean(SMS_SERVICE_ENABLED_KEY, true);
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int smsAppBindFlags = parser.getInt(
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SMS_APP_BIND_FLAGS_KEY,
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Context.BIND_NOT_VISIBLE | Context.BIND_FOREGROUND_SERVICE);
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long serviceStableConnectionThresholdSec = parser.getLong(
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SERVICE_STABLE_CONNECTION_THRESHOLD_SEC_KEY, TimeUnit.MINUTES.toSeconds(2));
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// Set minimum: 5 seconds.
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serviceReconnectBackoffSec = Math.max(5, serviceReconnectBackoffSec);
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// Set minimum: 1.0.
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serviceReconnectBackoffIncrease =
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Math.max(1, serviceReconnectBackoffIncrease);
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// Make sure max >= default back off.
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serviceReconnectMaxBackoffSec = Math.max(serviceReconnectBackoffSec,
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serviceReconnectMaxBackoffSec);
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SERVICE_RECONNECT_BACKOFF_SEC = serviceReconnectBackoffSec;
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SERVICE_RECONNECT_BACKOFF_INCREASE = serviceReconnectBackoffIncrease;
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SERVICE_RECONNECT_MAX_BACKOFF_SEC = serviceReconnectMaxBackoffSec;
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SERVICE_STABLE_CONNECTION_THRESHOLD_SEC = serviceStableConnectionThresholdSec;
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SMS_SERVICE_ENABLED = smsServiceEnabled;
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SMS_APP_BIND_FLAGS = smsAppBindFlags;
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}
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/**
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* Create a new instance from a settings string.
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*/
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public static AppBindingConstants initializeFromString(String settings) {
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return new AppBindingConstants(settings);
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}
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/**
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* dumpsys support.
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*/
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public void dump(String prefix, PrintWriter pw) {
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pw.print(prefix);
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pw.print("Constants: ");
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pw.println(sourceSettings);
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pw.print(prefix);
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pw.print(" SERVICE_RECONNECT_BACKOFF_SEC: ");
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pw.println(SERVICE_RECONNECT_BACKOFF_SEC);
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pw.print(prefix);
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pw.print(" SERVICE_RECONNECT_BACKOFF_INCREASE: ");
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pw.println(SERVICE_RECONNECT_BACKOFF_INCREASE);
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pw.print(prefix);
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pw.print(" SERVICE_RECONNECT_MAX_BACKOFF_SEC: ");
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pw.println(SERVICE_RECONNECT_MAX_BACKOFF_SEC);
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pw.print(prefix);
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pw.print(" SERVICE_STABLE_CONNECTION_THRESHOLD_SEC: ");
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pw.println(SERVICE_STABLE_CONNECTION_THRESHOLD_SEC);
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pw.print(prefix);
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pw.print(" SMS_SERVICE_ENABLED: ");
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pw.println(SMS_SERVICE_ENABLED);
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pw.print(prefix);
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pw.print(" SMS_APP_BIND_FLAGS: 0x");
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pw.println(Integer.toHexString(SMS_APP_BIND_FLAGS));
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}
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}
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