日志上报

1. 采集日志到本地文件。
2. 文件大小限制为1M，超过限制拷贝到备份文件。
3. 定义上报时机，上报日志文件

import Foundation

class HXLogger {
    static let shared = HXLogger()
    private let logFileName = "app_log.txt"
    private var logFileURL: URL?
    private let maxLogFileSize: Int = 1024 * 1024 // 1MB
    
    private init() {
        configureLogFile()
    }
    
    private func configureLogFile() {
        // 获取应用沙盒中的Documents目录
        guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
            return
        }
        
        // 创建日志文件URL
        logFileURL = documentsDirectory.appendingPathComponent(logFileName)
        
        // 如果日志文件已存在，删除旧文件
        if FileManager.default.fileExists(atPath: logFileURL?.path ?? "") {
            do {
                try FileManager.default.removeItem(at: logFileURL!)
            } catch {
                print("Failed to remove existing log file: \(error)")
            }
        }
    }
    
    func log(message: String) {
        guard let logFileURL = logFileURL else {
            return
        }
        
        do {
            // 获取文件大小
            let fileSize = try FileManager.default.attributesOfItem(atPath: logFileURL.path)[.size] as? Int ?? 0
            
            // 如果文件大小超过限制，备份旧文件并创建新文件
            if fileSize >= maxLogFileSize {
                try backupLogFile()
            }
            // 将日志信息追加到文件末尾
            try message.appendLineToURL(fileURL: logFileURL)
        } catch {
            print("Failed to write log message to file: \(error)")
        }
    }
    
    func backupLogFile() throws {
        guard let logFileURL = logFileURL else {
            return
        }
        
        // 在文件名中添加时间戳作为备份文件的名称
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyyMMddHHmmss"
        let timestamp = dateFormatter.string(from: Date())
        
        let backupFileName = logFileName.appendingFormat("_%@", timestamp)
        
        // 生成备份文件URL
        let backupFileURL = logFileURL.deletingLastPathComponent().appendingPathComponent(backupFileName)
        
        // 将当前日志文件移动到备份文件位置
        try FileManager.default.moveItem(at: logFileURL, to: backupFileURL)
        
        // 创建新的日志文件
        configureLogFile()
    }
}

// 扩展String类型，用于将字符串追加到文件末尾
extension String {
    func appendLineToURL(fileURL: URL) throws {
        try (self + "\n").appendToURL(fileURL: fileURL)
    }
    
    func appendToURL(fileURL: URL) throws {
        let data = self.data(using: String.Encoding.utf8)!
        try data.append(fileURL: fileURL)
    }
}

// 扩展Data类型，用于将数据追加到文件末尾
extension Data {
    func append(fileURL: URL) throws {
        if let fileHandle = try? FileHandle(forWritingTo: fileURL) {
            defer {
                fileHandle.closeFile()
            }
            fileHandle.seekToEndOfFile()
            fileHandle.write(self)
        } else {
            try write(to: fileURL, options: .atomic)
        }
    }
}