54 lines
1.5 KiB
Swift
54 lines
1.5 KiB
Swift
//
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// Copyright 2017 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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public class DeviceSleepBlockObject {
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public let blockReason: String
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public init(blockReason: String) {
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self.blockReason = blockReason
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}
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}
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@MainActor
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public protocol DeviceSleepManager {
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func addBlock(blockObject: DeviceSleepBlockObject)
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func removeBlock(blockObject: DeviceSleepBlockObject)
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}
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extension DeviceSleepManager {
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/// Listens to the given `updateStream`, calling `onUpdate` for each
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/// element. Blocks sleep for a given update if `onUpdate` returns true.
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public func manageBlockForUpdateStream<T>(
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_ updateStream: AsyncStream<T>,
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label: String,
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onUpdate: (T) -> Bool,
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) async {
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// Retained in-memory here as long as the update stream is running.
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var deviceSleepBlock: DeviceSleepBlockObject?
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for await update in updateStream {
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let shouldBlockSleep = onUpdate(update)
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if shouldBlockSleep {
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deviceSleepBlock = deviceSleepBlock ?? {
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let newSleepBlock = DeviceSleepBlockObject(blockReason: label)
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addBlock(blockObject: newSleepBlock)
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return newSleepBlock
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}()
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} else {
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deviceSleepBlock
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.take()
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.map { removeBlock(blockObject: $0) }
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}
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}
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if let deviceSleepBlock {
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removeBlock(blockObject: deviceSleepBlock)
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}
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}
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}
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