aws-sdk Aws::S3::Object#copy_from vs #copy_to

output.txt

irb(main):001:0> require_relative 'test'
AWS SDK version: 2.7.16
== TEST: test_copy_west_from_east
IT'S GOOD

== TEST: test_copy_east_from_west
IT'S GOOD

# ^ copy_from works fine regardless of direction

== TEST: test_copy_east_to_west
S3 client configured for "us-east-1" but the bucket "mziwisky-west-test" is in "us-west-2"; Please configure the proper region to avoid multiple unnecessary redirects and signing attempts
IT'S GOOD

# ^ that first copy_to from us-east-1 to us-west-2 spit out a warning, but still worked by following the redirect

== TEST: test_copy_east_to_west
IT'S GOOD

# ^ running the copy_to from us-east-1 to us-west-2 a second time works w/o warning due to the bucket-to-region cache that the gem builds internally

== TEST: test_copy_west_to_east
Aws::S3::Errors::PermanentRedirect: The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/seahorse/client/plugins/raise_response_errors.rb:15:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/aws-sdk-core/plugins/s3_sse_cpk.rb:19:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/aws-sdk-core/plugins/s3_dualstack.rb:24:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/aws-sdk-core/plugins/s3_accelerate.rb:34:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/aws-sdk-core/plugins/idempotency_token.rb:18:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/aws-sdk-core/plugins/param_converter.rb:20:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/seahorse/client/plugins/response_target.rb:21:in `call'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/seahorse/client/request.rb:70:in `send_request'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-core-2.7.16/lib/seahorse/client/base.rb:207:in `block (2 levels) in define_operation_methods'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-resources-2.7.16/lib/aws-sdk-resources/services/s3/object_copier.rb:33:in `copy_object'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-resources-2.7.16/lib/aws-sdk-resources/services/s3/object_copier.rb:19:in `copy_to'
	from /Users/mziwisky/.gem/ruby/2.1.7/gems/aws-sdk-resources-2.7.16/lib/aws-sdk-resources/services/s3/object.rb:103:in `copy_to'
	from /Users/mziwisky/test.rb:63:in `test_copy_west_to_east'
	from /Users/mziwisky/test.rb:88:in `block in <top (required)>'
	from /Users/mziwisky/test.rb:86:in `each'
	from /Users/mziwisky/test.rb:86:in `<top (required)>'
	from (irb):1:in `require_relative'
	from (irb):1
	from /Users/mziwisky/.rubies/ruby-2.1.7/bin/irb:11:in `<main>'

# ^ copy_to from us_west_2 to us_east_1 explodes

test.rb

require 'aws-sdk'

def get_buckets
  # clients get creds from env
  east_client = Aws::S3::Client.new(region: 'us-east-1')
  west_client = Aws::S3::Client.new(region: 'us-west-2')
  east_res = Aws::S3::Resource.new(client: east_client)
  west_res = Aws::S3::Resource.new(client: west_client)

  east_bucket = east_res.bucket('mziwisky-east-test')
  west_bucket = west_res.bucket('mziwisky-west-test')

  east_bucket.create rescue Aws::S3::Errors::BucketAlreadyOwnedByYou
  west_bucket.create rescue Aws::S3::Errors::BucketAlreadyOwnedByYou

  [east_bucket, west_bucket]
end

def setup
  east_bucket, west_bucket = get_buckets
  east_object = east_bucket.object('east-thing')
  west_object = west_bucket.object('west-thing')

  [east_object, west_object]
end

def populate(object)
  object.put(body: 'foobar')
end

def cleanup
  get_buckets.each do |bucket|
    bucket.delete! rescue Aws::S3::Errors::NoSuchBucket
  end
end

def assert_equal(o1, o2)
  good = o1.get.body.string == o2.get.body.string
  puts "IT'S #{good ? 'GOOD' : 'A FAILURE'}"
end

def test_copy_east_to_west
  east_object, west_object = setup
  populate(east_object)
  east_object.copy_to(west_object)
  assert_equal(east_object, west_object)
ensure
  cleanup
end

def test_copy_west_from_east
  east_object, west_object = setup
  populate(east_object)
  west_object.copy_from(east_object)
  assert_equal(east_object, west_object)
ensure
  cleanup
end

def test_copy_west_to_east
  east_object, west_object = setup
  populate(west_object)
  west_object.copy_to(east_object)
  assert_equal(east_object, west_object)
ensure
  cleanup
end

def test_copy_east_from_west
  east_object, west_object = setup
  populate(west_object)
  east_object.copy_from(west_object)
  assert_equal(east_object, west_object)
ensure
  cleanup
end

puts "AWS SDK version: #{Aws::VERSION}"

%i[
  test_copy_west_from_east
  test_copy_east_from_west
  test_copy_east_to_west
  test_copy_east_to_west
  test_copy_west_to_east
].each do |test|
  puts "== TEST: #{test}"
  send test
  puts
end