TestStackEnvironment.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.cloud.aws.support;

import com.amazonaws.AmazonClientException;
import com.amazonaws.services.cloudformation.AmazonCloudFormation;
import com.amazonaws.services.cloudformation.model.CreateStackRequest;
import com.amazonaws.services.cloudformation.model.DeleteStackRequest;
import com.amazonaws.services.cloudformation.model.DescribeStackResourcesRequest;
import com.amazonaws.services.cloudformation.model.DescribeStackResourcesResult;
import com.amazonaws.services.cloudformation.model.DescribeStacksRequest;
import com.amazonaws.services.cloudformation.model.DescribeStacksResult;
import com.amazonaws.services.cloudformation.model.OnFailure;
import com.amazonaws.services.cloudformation.model.Parameter;
import com.amazonaws.services.cloudformation.model.Stack;
import com.amazonaws.services.cloudformation.model.StackResource;
import com.amazonaws.services.cloudformation.model.Tag;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.aws.core.env.ec2.InstanceIdProvider;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.FileCopyUtils;

import java.io.IOException;
import java.io.InputStreamReader;

/**
 *
 */
public class TestStackEnvironment implements InitializingBean, DisposableBean, InstanceIdProvider {

    public static final String DEFAULT_STACK_NAME = "IntegrationTestStack";
    public static final String INSTANCE_ID_STACK_OUTPUT_KEY = "InstanceId";

    private static final String EC2_INSTANCE_NAME = "UserTagAndUserDataInstance";
    private static final String TEMPLATE_PATH = "IntegrationTestStack.yaml";

    @Value("${rdsPassword}")
    private String rdsPassword;

    private final AmazonCloudFormation amazonCloudFormationClient;
    private DescribeStackResourcesResult stackResources;
    private boolean stackCreatedByThisInstance;

    @Autowired
    public TestStackEnvironment(AmazonCloudFormation amazonCloudFormationClient) {
        this.amazonCloudFormationClient = amazonCloudFormationClient;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        this.stackResources = getStackResources(DEFAULT_STACK_NAME);
    }

    @Override
    public String getCurrentInstanceId() {
        return getByLogicalId(EC2_INSTANCE_NAME);
    }

    private DescribeStackResourcesResult getStackResources(String stackName) throws InterruptedException, IOException {
        try {
            DescribeStacksResult describeStacksResult = this.amazonCloudFormationClient.describeStacks(new DescribeStacksRequest().withStackName(stackName));
            for (Stack stack : describeStacksResult.getStacks()) {
                if (isAvailable(stack)) {
                    return this.amazonCloudFormationClient.describeStackResources(new DescribeStackResourcesRequest().withStackName(stack.getStackName()));
                }
                if (isError(stack)) {
                    if (this.stackCreatedByThisInstance) {
                        throw new IllegalArgumentException("Could not create stack");
                    }
                    this.amazonCloudFormationClient.deleteStack(new DeleteStackRequest().withStackName(stack.getStackName()));
                    return getStackResources(stackName);
                }
                if (isInProgress(stack)) {
                    //noinspection BusyWait
                    Thread.sleep(5000L);
                    return getStackResources(stackName);
                }
            }
        } catch (AmazonClientException e) {
            String templateBody = FileCopyUtils.copyToString(new InputStreamReader(new ClassPathResource(TEMPLATE_PATH).getInputStream()));
            this.amazonCloudFormationClient.createStack(new CreateStackRequest().withTemplateBody(templateBody).withOnFailure(OnFailure.DELETE).
                    withStackName(stackName).withTags(new Tag().withKey("tag1").withValue("value1")).
                    withParameters(new Parameter().withParameterKey("RdsPassword").withParameterValue(this.rdsPassword)));
            this.stackCreatedByThisInstance = true;
        }

        return getStackResources(stackName);
    }

    protected String getByLogicalId(String id) {
        for (StackResource stackResource : this.stackResources.getStackResources()) {
            if (stackResource.getLogicalResourceId().equals(id)) {
                return stackResource.getPhysicalResourceId();
            }
        }
        return null;
    }

    private boolean isAvailable(Stack stack) {
        return stack.getStackStatus().endsWith("_COMPLETE") && !"DELETE_COMPLETE".equals(stack.getStackStatus());
    }

    private boolean isError(Stack stack) {
        return stack.getStackStatus().endsWith("_FAILED");
    }

    @Override
    public void destroy() throws Exception {
        if (this.stackCreatedByThisInstance) {
            this.amazonCloudFormationClient.deleteStack(new DeleteStackRequest().withStackName(DEFAULT_STACK_NAME));
        }
    }

    public boolean isStackCreatedAutomatically() {
        return this.stackCreatedByThisInstance;
    }

    private static boolean isInProgress(Stack stack) {
        return stack.getStackStatus().endsWith("_PROGRESS");
    }
}