com.netflix.spinnaker.clouddriver.aws.event.AfterResizeEventHandler.java Source code

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Here is the source code for com.netflix.spinnaker.clouddriver.aws.event.AfterResizeEventHandler.java

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/*
 * Copyright 2018 Netflix, Inc.
 *
 * 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 com.netflix.spinnaker.clouddriver.aws.event;

import com.amazonaws.services.autoscaling.model.AutoScalingGroup;
import com.amazonaws.services.autoscaling.model.Instance;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.TerminateInstancesRequest;
import com.google.common.collect.Lists;
import com.netflix.spinnaker.clouddriver.data.task.Task;

import java.util.List;
import java.util.stream.Collectors;

public interface AfterResizeEventHandler {
    int MAX_SIMULTANEOUS_TERMINATIONS = 100;
    String PHASE = "RESIZE";

    void handle(AfterResizeEvent event);

    default void terminateInstancesInAutoScalingGroup(Task task, AmazonEC2 amazonEC2,
            AutoScalingGroup autoScalingGroup) {
        String serverGroupName = autoScalingGroup.getAutoScalingGroupName();

        List<String> instanceIds = autoScalingGroup.getInstances().stream().map(Instance::getInstanceId)
                .collect(Collectors.toList());

        int terminatedCount = 0;
        for (List<String> partition : Lists.partition(instanceIds, MAX_SIMULTANEOUS_TERMINATIONS)) {
            try {
                terminatedCount += partition.size();
                task.updateStatus(PHASE, String.format("Terminating %d of %d instances in %s", terminatedCount,
                        instanceIds.size(), serverGroupName));
                amazonEC2.terminateInstances(new TerminateInstancesRequest().withInstanceIds(partition));
            } catch (Exception e) {
                task.updateStatus(PHASE,
                        String.format("Unable to terminate instances, reason: '%s'", e.getMessage()));
            }
        }
    }
}