Merge pull request #27 from grandcentrix/fix-scan-stability

Improve scan stability

Author: James Hutchby

GCXMulticastDNSKit.xcodeproj/project.pbxproj

@@ -156,7 +156,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0820;
-				LastUpgradeCheck = 1020;
+				LastUpgradeCheck = 1250;
 				ORGANIZATIONNAME = "grandcentrix GmbH";
 				TargetAttributes = {
 					68FF3C161E24DDDF00A482A8 = {
@@ -278,6 +278,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -303,7 +304,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.2;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -341,6 +342,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -360,7 +362,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 10.2;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";

GCXMulticastDNSKit.xcodeproj/xcshareddata/xcschemes/GCXMulticastDNSKit.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1020"
+   LastUpgradeVersion = "1250"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -27,6 +27,15 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "68FF3C161E24DDDF00A482A8"
+            BuildableName = "GCXMulticastDNSKit.framework"
+            BlueprintName = "GCXMulticastDNSKit"
+            ReferencedContainer = "container:GCXMulticastDNSKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
       <Testables>
          <TestableReference
             skipped = "NO">
@@ -39,17 +48,6 @@
             </BuildableReference>
          </TestableReference>
       </Testables>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "68FF3C161E24DDDF00A482A8"
-            BuildableName = "GCXMulticastDNSKit.framework"
-            BlueprintName = "GCXMulticastDNSKit"
-            ReferencedContainer = "container:GCXMulticastDNSKit.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -70,8 +68,6 @@
             ReferencedContainer = "container:GCXMulticastDNSKit.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"

GCXMulticastDNSKit/Discovery.swift

@@ -216,12 +216,13 @@ extension Discovery {
         }
     }
 
-    /// stops all search and resolve operations, nil out delegates to circumvent http://www.openradar.me/28943305
+    /// stops all search and resolve operations
     private func stopSearchingAndResolving() {
-        _ = items?.map {
+        items?.forEach {
             $0.netServiceBrowser.stop()
+            // set delegate to nil to circumvent http://www.openradar.me/28943305
             $0.netServiceBrowser.delegate = nil
-            _ = $0.netServices.map {
+            $0.netServices.forEach {
                 $0.stop()
                 $0.delegate = nil
             }
@@ -285,6 +286,28 @@ extension Discovery: NetServiceBrowserDelegate {
     public func netServiceBrowser(_ browser: NetServiceBrowser, didNotSearch errorDict: [String: NSNumber]) {
         guard let item = item(serviceBrowser: browser) else { return }
 
+        if let errorCode = errorDict[NetService.errorCode] as? Int {
+            if let netServiceError = NetService.ErrorCode(rawValue: errorCode) {
+                switch netServiceError {
+                // when unknown error is received, browsing has stopped and must be restarted.
+                // this happens when the app suspends/resumes
+                case .unknownError:
+                    // notify the caller that all existing discovered services have dissapeared
+                    for service in item.netServices {
+                        notifyDiscoveryServiceDidDisappear(service: DiscoveryService(configuration: item.configuration, netService: service))
+                    }
+                    // immediately restart discovery
+                    self.startDiscovery()
+
+                    // don't send .browsingFailure
+                    return
+                default:
+                    break
+                }
+            }
+        }
+
+        // other failures should be returned because it could be a configuration error
         notifyDiscoveryDidFail(configuration: item.configuration, error: .browsingFailure)
     }