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ExAws.S3

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Service module for https://github.com/ex-aws/ex_aws

Installation

The package can be installed by adding :ex_aws_s3 to your list of dependencies in mix.exs along with :ex_aws, your preferred JSON codec / HTTP client, and optionally :sweet_xml to support operations like list_objects that require XML parsing.

def deps do
  [
    {:ex_aws, "~> 2.0"},
    {:ex_aws_s3, "~> 2.0"},
    {:poison, "~> 3.0"},
    {:hackney, "~> 1.9"},
    {:sweet_xml, "~> 0.6.6"}, # optional dependency
  ]
end

Operations on AWS S3

Basic Operations

The vast majority of operations here represent a single operation on S3.

Examples

S3.list_objects("my-bucket") |> ExAws.request! #=> %{body: [list, of, objects]}
S3.list_objects("my-bucket") |> ExAws.stream! |> Enum.to_list #=> [list, of, objects]

S3.put_object("my-bucket", "path/to/bucket", contents) |> ExAws.request!

Higher Level Operations

There are also some operations which operate at a higher level to make it easier to download and upload very large files.

Multipart uploads

"path/to/big/file"
|> S3.Upload.stream_file
|> S3.upload("my-bucket", "path/on/s3")
|> ExAws.request #=> {:ok, :done}

See ExAws.S3.upload/4 for options

Download large file to disk

S3.download_file("my-bucket", "path/on/s3", "path/to/dest/file")
|> ExAws.request #=> {:ok, :done}

More high level functionality

Task.async_stream makes some high level flows so easy you don't need explicit ExAws support.

For example, here is how to concurrently upload many files.

upload_file = fn {src_path, dest_path} ->
  S3.put_object("my_bucket", dest_path, File.read!(src_path))
  |> ExAws.request!
end

paths = %{"path/to/src0" => "path/to/dest0", "path/to/src1" => "path/to/dest1"}

paths
|> Task.async_stream(upload_file, max_concurrency: 10)
|> Stream.run

Bucket as host functionality

Examples

opts = [virtual_host: true, bucket_as_host: true]

ExAws.Config.new(:s3)
|> S3.presigned_url(:get, "bucket.custom-domain.com", "foo.txt", opts)

{:ok, "https://bucket.custom-domain.com/foo.txt"}

Configuration

The scheme, host, and port can be configured to hit alternate endpoints.

For example, this is how to use a local minio instance:

# config.exs
config :ex_aws, :s3,
  scheme: "http://",
  host: "localhost",
  port: 9000

An alternate content_hash_algorithm can be specified as well. The default is :md5. It may be necessary to change this when operating in a FIPS-compliant environment where MD5 isn't available, for instance. At this time, only :sha256, :sha, and :md5 are supported by both Erlang and S3.

# config.exs
config :ex_aws_s3, :content_hash_algorithm, :sha256

License

The MIT License (MIT)

Copyright (c) 2014 CargoSense, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.