78 lines
2.8 KiB
Swift
78 lines
2.8 KiB
Swift
//
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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/// Used to track progress of a backup export, which we measure as a fraction of the total
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/// number of database rows we've exported so far.
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/// Note that this even weighting by row does NOT reflect time spent; some rows require
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/// more work and time to process. But this is just an estimate for UX display.
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public struct MessageBackupExportProgress {
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public let progress: Progress
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private init(progress: Progress) {
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self.progress = progress
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}
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public static func prepare(db: any DB) throws -> Self {
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var estimatedFrameCount = try db.read { tx in
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// Get all the major things we iterate over. It doesn't have
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// to be perfect; we'll skip some of these and besides they're
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// all weighted evenly. Its just an estimate.
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return try
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SignalRecipient.fetchCount(tx.databaseConnection)
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+ ThreadRecord.fetchCount(tx.databaseConnection)
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+ InteractionRecord.fetchCount(tx.databaseConnection)
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+ CallLinkRecord.fetchCount(tx.databaseConnection)
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+ StickerPackRecord.fetchCount(tx.databaseConnection)
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}
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// Add a fixed extra amount for:
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// * header frame
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// * self recipient
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// * account data frame
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// * release notes channel
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estimatedFrameCount += 4
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return .init(progress: Progress(totalUnitCount: Int64(estimatedFrameCount)))
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}
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public func didExportFrame() {
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progress.completedUnitCount = min(progress.totalUnitCount, progress.completedUnitCount + 1)
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}
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public func didFinishExport() {
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progress.completedUnitCount = progress.totalUnitCount
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}
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}
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/// Used to track progress of a backup import, which we measure as a fraction of the total
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/// number of bytes in the input file that we've processed so far.
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/// Note that this even weighting by byte does NOT reflect time spent; some frames require
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/// more work and time to process. But this is just an estimate for UX display.
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public struct MessageBackupImportProgress {
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public let progress: Progress
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private init(progress: Progress) {
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self.progress = progress
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}
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public static func prepare(fileUrl: URL) throws -> Self {
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guard let totalByteCount = OWSFileSystem.fileSize(of: fileUrl)?.int64Value else {
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throw OWSAssertionError("Unable to read file size")
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}
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return .init(progress: Progress(totalUnitCount: totalByteCount))
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}
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public func didReadBytes(byteLength: Int64) {
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progress.completedUnitCount = min(
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progress.totalUnitCount,
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progress.completedUnitCount + byteLength
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)
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}
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public func didFinishImport() {
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progress.completedUnitCount = progress.totalUnitCount
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}
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}
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