fix(ipv6): Support IPv6 (#552)

Author: robertmogos

Sources/AlgoliaSearch-Client/Network.swift

@@ -96,13 +96,23 @@ internal class URLSessionLogger: NSObject, URLSession {
 
     init(session: URLSession) {
         self.session = session
+      if #available(iOS 9, OSX 10.11, *) {
+        var zeroAddress6: sockaddr_in6 = sockaddr_in6()
+        zeroAddress6.sin6_len = UInt8(MemoryLayout.size(ofValue: zeroAddress6))
+        zeroAddress6.sin6_family = sa_family_t(AF_INET6)
+        defaultRouteReachability = withUnsafePointer(to: &zeroAddress6) {
+          let zeroAddressAsSockaddr = UnsafePointer<sockaddr>(OpaquePointer($0))
+          return SCNetworkReachabilityCreateWithAddress(nil, zeroAddressAsSockaddr)!
+        }
+      } else {
         var zeroAddress: sockaddr_in = sockaddr_in()
         zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
         zeroAddress.sin_family = sa_family_t(AF_INET)
         defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
             let zeroAddressAsSockaddr = UnsafePointer<sockaddr>(OpaquePointer($0))
             return SCNetworkReachabilityCreateWithAddress(nil, zeroAddressAsSockaddr)!
         }
+      }
 
         // Reset the (global) epoch for logging.
         URLSessionLogger.epoch = Date()

Sources/AlgoliaSearch-Client/NetworkReachability.swift

@@ -51,12 +51,21 @@ class SystemNetworkReachability: NetworkReachability {
 
     init() {
         // Create reachability handle to an all-zeroes address.
+      if #available(iOS 9, OSX 10.11, tvOS 9, *) {
+        var zeroAddress6 = SystemNetworkReachability.zeroAddress6
+        reachability = withUnsafePointer(to: &zeroAddress6) {
+          $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
+            SCNetworkReachabilityCreateWithAddress(nil, $0)
+          }
+          }!
+      } else {
         var zeroAddress = SystemNetworkReachability.zeroAddress
         reachability = withUnsafePointer(to: &zeroAddress) {
-            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
-                SCNetworkReachabilityCreateWithAddress(nil, $0)
-            }
-        }!
+          $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
+            SCNetworkReachabilityCreateWithAddress(nil, $0)
+          }
+          }!
+      }
     }
 
     /// Test if network connectivity is currently available.
@@ -83,6 +92,14 @@ class SystemNetworkReachability: NetworkReachability {
         address.sin_family = sa_family_t(AF_INET)
         return address
     }()
+  
+  /// An all zeroes IP address.
+  static let zeroAddress6: sockaddr_in6 = {
+    var address = sockaddr_in6()
+    address.sin6_len = UInt8(MemoryLayout<sockaddr_in6>.size)
+    address.sin6_family = sa_family_t(AF_INET6)
+    return address
+  }()
 }
 
 #endif // !os(watchOS)