mirror of
https://github.com/wnagrodzki/SwiftLogger.git
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65 lines
2.3 KiB
Swift
65 lines
2.3 KiB
Swift
//
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// MIT License
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//
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// Copyright (c) 2018 Wojciech Nagrodzki
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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import Foundation
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final class FileRotate {
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private let fileURL: URL
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private let rotations: Int
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private let fileSystem: FileSystem
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/// Initializes new Logrotate instance.
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///
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/// - Parameters:
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/// - fileURL: URL of the log file.
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/// - rotations: Number of times log files are rotated before being removed.
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init(fileURL: URL, rotations: Int, fileSystem: FileSystem) {
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precondition(rotations > 0)
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self.fileURL = fileURL
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self.rotations = rotations
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self.fileSystem = fileSystem
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}
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}
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extension FileRotate: Logrotate {
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func rotate() throws {
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let range = 1...rotations
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let pathExtensions = range.map { "\($0)" }
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let rotatedURLs = pathExtensions.map { fileURL.appendingPathExtension($0) }
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let allURLs = [fileURL] + rotatedURLs
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let toDelete = rotatedURLs.last!
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let toMove = zip(allURLs, rotatedURLs).reversed()
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if fileSystem.itemExists(at: toDelete) {
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try fileSystem.removeItem(at: toDelete)
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}
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for (oldURL, newURL) in toMove {
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guard fileSystem.itemExists(at: oldURL) else { continue }
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try fileSystem.moveItem(at: oldURL, to: newURL)
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}
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}
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}
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