Fix for AlreadyExists

Author: tvp-1

pom.xml

@@ -295,7 +295,7 @@
                     <java>
                         <!-- this automatically inserts line breaks, so apply it before eclipse formatter! -->
                         <importOrder>
-                            <order>com,edu,java,lombok,javax,org,software</order>
+                            <order>com,edu,java,javax,lombok,org,software</order>
                         </importOrder>
                         <removeUnusedImports/>
                         <eclipse>

src/main/java/software/amazon/cloudformation/AbstractWrapper.java

@@ -326,7 +326,8 @@ public void processRequest(final InputStream inputStream, final OutputStream out
         if (request.getRequestData().getCallerCredentials() != null) {
             awsClientProxy = new AmazonWebServicesClientProxy(this.loggerProxy, request.getRequestData().getCallerCredentials(),
                                                               DelayFactory.CONSTANT_DEFAULT_DELAY_FACTORY,
-                                                              WaitStrategy.scheduleForCallbackStrategy());
+                                                              WaitStrategy.scheduleForCallbackStrategy(),
+                                                              request.getStackId() != null);
         }
 
         ProgressEvent<ResourceT, CallbackT> handlerResponse = wrapInvocationAndHandleErrors(awsClientProxy,

src/main/java/software/amazon/cloudformation/HookAbstractWrapper.java

@@ -249,7 +249,7 @@ private ProgressEvent<TargetT, CallbackT> processInvocation(final JSONObject raw
             if (processedCallerCredentials != null) {
                 awsClientProxy = new AmazonWebServicesClientProxy(this.loggerProxy, processedCallerCredentials,
                                                                   DelayFactory.CONSTANT_DEFAULT_DELAY_FACTORY,
-                                                                  WaitStrategy.scheduleForCallbackStrategy());
+                                                                  WaitStrategy.scheduleForCallbackStrategy(), true);
 
             }
 

src/main/java/software/amazon/cloudformation/proxy/AmazonWebServicesClientProxy.java

@@ -31,6 +31,8 @@
 import java.util.function.Function;
 import java.util.function.Supplier;
 import javax.annotation.Nonnull;
+import lombok.Getter;
+import lombok.Setter;
 import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
 import software.amazon.awssdk.auth.credentials.AwsSessionCredentials;
 import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
@@ -66,6 +68,9 @@ public class AmazonWebServicesClientProxy implements CallChain {
     private final LoggerProxy loggerProxy;
     private final DelayFactory override;
     private final WaitStrategy waitStrategy;
+    @Getter
+    @Setter
+    private Boolean invokedByCfn;
 
     public AmazonWebServicesClientProxy(final LoggerProxy loggerProxy,
                                         final Credentials credentials,
@@ -77,13 +82,14 @@ public AmazonWebServicesClientProxy(final LoggerProxy loggerProxy,
                                         final Credentials credentials,
                                         final Supplier<Long> remainingTimeToExecute,
                                         final DelayFactory override) {
-        this(loggerProxy, credentials, override, WaitStrategy.newLocalLoopAwaitStrategy(remainingTimeToExecute));
+        this(loggerProxy, credentials, override, WaitStrategy.newLocalLoopAwaitStrategy(remainingTimeToExecute), null);
     }
 
     public AmazonWebServicesClientProxy(final LoggerProxy loggerProxy,
                                         final Credentials credentials,
                                         final DelayFactory override,
-                                        final WaitStrategy waitStrategy) {
+                                        final WaitStrategy waitStrategy,
+                                        final Boolean invokedByCfn) {
         this.loggerProxy = loggerProxy;
         BasicSessionCredentials basicSessionCredentials = new BasicSessionCredentials(credentials.getAccessKeyId(),
                                                                                       credentials.getSecretAccessKey(),
@@ -95,6 +101,7 @@ public AmazonWebServicesClientProxy(final LoggerProxy loggerProxy,
         this.v2CredentialsProvider = StaticCredentialsProvider.create(awsSessionCredentials);
         this.override = Objects.requireNonNull(override);
         this.waitStrategy = Objects.requireNonNull(waitStrategy);
+        this.invokedByCfn = invokedByCfn;
     }
 
     public <ClientT> ProxyClient<ClientT> newProxy(@Nonnull Supplier<ClientT> client) {
@@ -331,6 +338,15 @@ public Completed<RequestT, ResponseT, ClientT, ModelT, CallbackT> handleError(Ex
                                     do {
                                         try {
                                             event = inner.invoke(request, ex, client_, model_, context_);
+
+                                            //
+                                            // Ensure that we null out model for AlreadyExists to meet CFN IaC expectations
+                                            //
+                                            if (event.getErrorCode() == HandlerErrorCode.AlreadyExists
+                                                && AmazonWebServicesClientProxy.this.invokedByCfn) {
+                                                event.setResourceModel(null);
+                                            }
+
                                         } catch (RetryableException e) {
                                             break;
                                         } catch (Exception e) {

src/main/java/software/amazon/cloudformation/proxy/hook/targetmodel/HookTargetModel.java

@@ -25,11 +25,11 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Map.Entry;
+import javax.annotation.CheckForNull;
 import lombok.AccessLevel;
 import lombok.Data;
 import lombok.NonNull;
 import lombok.Setter;
-import javax.annotation.CheckForNull;
 import org.json.JSONObject;
 import software.amazon.cloudformation.resource.Serializer;