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@ -2,10 +2,18 @@
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final class IP2Country {
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var countryNamesCache: [String:String] = [:]
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private lazy var ipv4Table: [String:[String]] = {
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private static let workQueue = DispatchQueue(label: "IP2Country.workQueue", qos: .utility) // It's important that this is a serial queue
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static var isInitialized = false
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// MARK: Tables
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/// This table has two columns: the "network" column and the "registered_country_geoname_id" column. The network column contains the **lower** bound of an IP
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/// range and the "registered_country_geoname_id" column contains the ID of the country corresponding to that range. We look up an IP by finding the first index in the
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/// network column where the value is greater than the IP we're looking up (converted to an integer). The IP we're looking up must then be in the range **before** that
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/// range.
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private lazy var ipv4Table: [String:[Int]] = {
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let url = Bundle.main.url(forResource: "GeoLite2-Country-Blocks-IPv4", withExtension: nil)!
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let data = try! Data(contentsOf: url)
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return try! NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as! [String:[String]]
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return try! NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as! [String:[Int]]
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}()
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private lazy var countryNamesTable: [String:[String]] = {
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@ -14,10 +22,6 @@ final class IP2Country {
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return try! NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as! [String:[String]]
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}()
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private static let workQueue = DispatchQueue(label: "IP2Country.workQueue", qos: .utility) // It's important that this is a serial queue
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static var isInitialized = false
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// MARK: Lifecycle
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static let shared = IP2Country()
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@ -28,29 +32,17 @@ final class IP2Country {
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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// MARK: Implementation
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private func cacheCountry(for ip: String) -> String {
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var truncatedIP = ip
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func getCountryInternal() -> String {
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if let country = countryNamesCache[ip] { return country }
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if let ipv4TableIndex = ipv4Table["network"]!.firstIndex(where: { $0.starts(with: truncatedIP) }) {
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let countryID = ipv4Table["registered_country_geoname_id"]![ipv4TableIndex]
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if let countryNamesTableIndex = countryNamesTable["geoname_id"]!.firstIndex(of: countryID) {
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let country = countryNamesTable["country_name"]![countryNamesTableIndex]
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countryNamesCache[ip] = country
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return country
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}
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}
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if truncatedIP.contains(".") && !truncatedIP.hasSuffix(".") { // The fuzziest we want to go is xxx.x
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truncatedIP.removeLast()
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if truncatedIP.hasSuffix(".") { truncatedIP.removeLast() }
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return getCountryInternal()
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} else {
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return "Unknown Country"
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}
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}
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return getCountryInternal()
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if let result = countryNamesCache[ip] { return result }
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let ipAsInt = IPv4.toInt(ip)
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guard let ipv4TableIndex = given(ipv4Table["network"]!.firstIndex(where: { $0 > ipAsInt }), { $0 - 1 }) else { return "Unknown Country" } // Relies on the array being sorted
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let countryID = ipv4Table["registered_country_geoname_id"]![ipv4TableIndex]
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guard let countryNamesTableIndex = countryNamesTable["geoname_id"]!.firstIndex(of: String(countryID)) else { return "Unknown Country" }
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let result = countryNamesTable["country_name"]![countryNamesTableIndex]
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countryNamesCache[ip] = result
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return result
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}
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@objc func populateCacheIfNeededAsync() {
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Niels Andriesse
4 years ago