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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui.flags
import android.provider.DeviceConfig
import android.util.Log
import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.dagger.qualifiers.Background
import com.android.systemui.dagger.qualifiers.TestHarness
import com.android.systemui.util.DeviceConfigProxy
import dagger.Module
import dagger.Provides
import java.util.concurrent.Executor
import javax.inject.Inject
interface ServerFlagReader {
/** Returns true if there is a server-side setting stored. */
fun hasOverride(namespace: String, name: String): Boolean
/** Returns any stored server-side setting or the default if not set. */
fun readServerOverride(namespace: String, name: String, default: Boolean): Boolean
/** Register a listener for changes to any of the passed in flags. */
fun listenForChanges(values: Collection<Flag<*>>, listener: ChangeListener)
interface ChangeListener {
fun onChange(flag: Flag<*>, value: String?)
}
}
class ServerFlagReaderImpl @Inject constructor(
private val namespace: String,
private val deviceConfig: DeviceConfigProxy,
@Background private val executor: Executor,
@TestHarness private val isTestHarness: Boolean
) : ServerFlagReader {
private val TAG = "ServerFlagReader"
private val listeners =
mutableListOf<Pair<ServerFlagReader.ChangeListener, Collection<Flag<*>>>>()
private val onPropertiesChangedListener = object : DeviceConfig.OnPropertiesChangedListener {
override fun onPropertiesChanged(properties: DeviceConfig.Properties) {
if (isTestHarness) {
Log.w(TAG, "Ignore server flag changes in Test Harness mode.")
return
}
if (properties.namespace != namespace) {
return
}
for ((listener, flags) in listeners) {
propLoop@ for (propName in properties.keyset) {
for (flag in flags) {
if (propName == flag.name) {
listener.onChange(flag, properties.getString(propName, null))
break@propLoop
}
}
}
}
}
}
override fun hasOverride(namespace: String, name: String): Boolean =
!namespace.isBlank() && !name.isBlank() && deviceConfig.getProperty(
namespace,
name
) != null
override fun readServerOverride(namespace: String, name: String, default: Boolean): Boolean =
!namespace.isBlank() && !name.isBlank() && deviceConfig.getBoolean(
namespace,
name,
default
)
override fun listenForChanges(
flags: Collection<Flag<*>>,
listener: ServerFlagReader.ChangeListener
) {
if (listeners.isEmpty()) {
deviceConfig.addOnPropertiesChangedListener(
namespace,
executor,
onPropertiesChangedListener
)
}
listeners.add(Pair(listener, flags))
}
}
@Module
interface ServerFlagReaderModule {
companion object {
private val SYSUI_NAMESPACE = "systemui"
@JvmStatic
@Provides
@SysUISingleton
fun bindsReader(
deviceConfig: DeviceConfigProxy,
@Background executor: Executor,
@TestHarness isTestHarness: Boolean
): ServerFlagReader {
return ServerFlagReaderImpl(
SYSUI_NAMESPACE, deviceConfig, executor, isTestHarness
)
}
}
}
class ServerFlagReaderFake : ServerFlagReader {
private val flagMap: MutableMap<String, Boolean> = mutableMapOf()
private val listeners =
mutableListOf<Pair<ServerFlagReader.ChangeListener, Collection<Flag<*>>>>()
override fun hasOverride(namespace: String, name: String): Boolean {
return flagMap.containsKey(name)
}
override fun readServerOverride(namespace: String, name: String, default: Boolean): Boolean {
return flagMap.getOrDefault(name, default)
}
fun setFlagValue(namespace: String, name: String, value: Boolean) {
flagMap.put(name, value)
for ((listener, flags) in listeners) {
flagLoop@ for (flag in flags) {
if (name == flag.name) {
listener.onChange(flag, if (value) "true" else "false")
break@flagLoop
}
}
}
}
fun eraseFlag(namespace: String, name: String) {
flagMap.remove(name)
}
override fun listenForChanges(
flags: Collection<Flag<*>>,
listener: ServerFlagReader.ChangeListener
) {
listeners.add(Pair(listener, flags))
}
}
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