A flexible easy to use set of AWS APIs.
Available Services: https://github.com/ex-aws?q=service&type=&language=
ExAws v2.0 breaks out every service into its own package. To use the S3 service, you need both the core :ex_aws
package as well as the :ex_aws_s3
package.
As with all ExAws services, you'll need a compatible HTTP client (defaults to :hackney
) and whatever JSON or XML codecs needed by the services you want to use. Consult individual service documentation for details on what each service needs.
defp deps do
[
{:ex_aws, "~> 2.0"},
{:ex_aws_s3, "~> 2.0"},
{:hackney, "~> 1.9"},
{:sweet_xml, "~> 0.6"},
]
end
With these deps you can use ExAws
precisely as you're used to:
# make a request (with the default region)
ExAws.S3.list_objects("my-bucket") |> ExAws.request
# or specify the region
ExAws.S3.list_objects("my-bucket") |> ExAws.request(region: "us-west-1")
# some operations support streaming
ExAws.S3.list_objects("my-bucket") |> ExAws.stream! |> Enum.to_list
ExAws requires valid AWS keys in order to work properly. ExAws by default does the equivalent of:
config :ex_aws,
access_key_id: [{:system, "AWS_ACCESS_KEY_ID"}, :instance_role],
secret_access_key: [{:system, "AWS_SECRET_ACCESS_KEY"}, :instance_role]
This means it will try to resolve credentials in order
- Look for the AWS standard
AWS_ACCESS_KEY_ID
andAWS_SECRET_ACCESS_KEY
environment variables - Resolve credentials with IAM
- If running inside ECS and a task role has been assigned it will use it
- Otherwise it will fall back to the instance role
AWS CLI config files are supported, but require an additional dependency:
{:configparser_ex, "~> 2.0"}
You can then add {:awscli, "profile_name", timeout}
to the above config and it
will pull information from ~/.aws/config
and ~/.aws/credentials
config :ex_aws,
access_key_id: [{:system, "AWS_ACCESS_KEY_ID"}, {:awscli, "default", 30}, :instance_role],
secret_access_key: [{:system, "AWS_SECRET_ACCESS_KEY"}, {:awscli, "default", 30}, :instance_role],
ExAws by default uses hackney to make HTTP requests to AWS API. You can modify the options as such:
config :ex_aws, :hackney_opts,
follow_redirect: true,
recv_timeout: 30_000
You can set the region used by default for requests.
config :ex_aws,
region: "us-west-2",
ExAws can also be used directly without any specific service module.
--TODO--
- Easy configuration.
- Minimal dependencies. Choose your favorite JSON codec and HTTP client.
- Elixir streams to automatically retrieve paginated resources.
- Elixir protocols allow easy customization of Dynamo encoding / decoding.
mix aws.kinesis.tail your-stream-name
task for easily watching the contents of a kinesis stream.- Simple. ExAws aims to provide a clear and consistent elixir wrapping around AWS APIs, not abstract them away entirely. For every action in a given AWS API there is a corresponding function within the appropriate module. Higher level abstractions like the aforementioned streams are in addition to and not instead of basic API calls.
That's it!
ExAws will retry failed AWS API requests using exponential backoff per the "Full Jitter" formula described in https://www.awsarchitectureblog.com/2015/03/backoff.html
The algorithm uses three values, which are configurable:
# default values shown below
config :ex_aws, :retries,
max_attempts: 10,
base_backoff_in_ms: 10,
max_backoff_in_ms: 10_000
max_attempts
is the maximum number of possible attempts with backoffs in between each onebase_backoff_in_ms
corresponds to thebase
value described in the blog postmax_backoff_in_ms
corresponds to thecap
value described in the blog post
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.
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