Updating a Ruby on Rails Application for Amazon Elastic Beanstalk

The following example updates the Ruby on Rails application MyRailsApp in the us-west-2 region.

# Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# This file is licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License. A copy of the
# License is located at
#
# http://aws.amazon.com/apache2.0/
#
# This file 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.

require 'aws-sdk-elasticbeanstalk'  # v2: require 'aws-sdk'

Aws.config.update({region: 'us-west-2'})

eb = Aws::ElasticBeanstalk::Client.new
s3 = Aws::S3::Client.new

app_name = 'MyRailsApp'

# Get S3 bucket containing app
app_versions = eb.describe_application_versions({ application_name: app_name })
av = app_versions.application_versions[0]
bucket = av.source_bundle.s3_bucket
s3_key = av.source_bundle.s3_key

# Get info on environment
envs = eb.describe_environments({ application_name: app_name })
env = envs.environments[0]
env_name = env.environment_name

# Create new storage location
resp = eb.create_storage_location()

puts "Created storage location in bucket #{resp.s3_bucket}"

s3.list_objects({
  prefix: s3_key,
  bucket: bucket
})

# Create ZIP file
zip_file_basename = SecureRandom.urlsafe_base64.to_s
zip_file_name = zip_file_basename + '.zip'

# Call out to OS to produce ZIP file
cmd = "git archive --format=zip -o #{zip_file_name} HEAD"
%x[ #{cmd} ]

# Get ZIP file contents
zip_contents = File.read(zip_file_name)

key = app_name + "\\" + zip_file_name

s3.put_object({
  body: zip_contents,
  bucket: bucket,
  key: key
})

date = Time.new
today = date.day.to_s + "/" + date.month.to_s + "/" + date.year.to_s

eb.create_application_version({
  process: false,
  application_name: app_name,
  version_label: zip_file_basename,
  source_bundle: {
    s3_bucket: bucket,
    s3_key: key
  },
  description: "Updated #{today}"
})

eb.update_environment({
  environment_name: env_name,
  version_label: zip_file_basename
})