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// SPDX-License-Identifier: MIT
// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
import Foundation
public class LogViewHelper {
var log: OpaquePointer
var cursor: UInt32 = UINT32_MAX
static let formatOptions: ISO8601DateFormatter.Options = [
.withYear, .withMonth, .withDay, .withTime,
.withDashSeparatorInDate, .withColonSeparatorInTime, .withSpaceBetweenDateAndTime,
.withFractionalSeconds
]
struct LogEntry {
let timestamp: String
let message: String
func text() -> String {
return timestamp + " " + message
}
}
class LogEntries {
var entries: [LogEntry] = []
}
init?(logFilePath: String?) {
guard let logFilePath = logFilePath else { return nil }
guard let log = open_log(logFilePath) else { return nil }
self.log = log
}
deinit {
close_log(self.log)
}
func fetchLogEntriesSinceLastFetch(completion: @escaping ([LogViewHelper.LogEntry]) -> Void) {
var logEntries = LogEntries()
DispatchQueue.global(qos: .userInitiated).async { [weak self] in
guard let self = self else { return }
let newCursor = view_lines_from_cursor(self.log, self.cursor, &logEntries) { cStr, timestamp, ctx in
let message = cStr != nil ? String(cString: cStr!) : ""
let date = Date(timeIntervalSince1970: Double(timestamp) / 1000000000)
let dateString = ISO8601DateFormatter.string(from: date, timeZone: TimeZone.current, formatOptions: LogViewHelper.formatOptions)
if let logEntries = ctx?.bindMemory(to: LogEntries.self, capacity: 1) {
logEntries.pointee.entries.append(LogEntry(timestamp: dateString, message: message))
}
}
DispatchQueue.main.async { [weak self] in
guard let self = self else { return }
self.cursor = newCursor
completion(logEntries.entries)
}
}
}
}
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