EwStripe Ruby Library

The EwStripe Ruby library provides convenient access to the EwStripe API from applications written in the Ruby language. It includes a pre-defined set of classes for API resources that initialize themselves dynamically from API responses which makes it compatible with a wide range of versions of the EwStripe API.

The library also provides other features. For example:

• Easy configuration path for fast setup and use.
• Helpers for pagination.
• Built-in mechanisms for the serialization of parameters according to the expectations of EwStripe's API.

Documentation

See the Ruby API docs.

See video demonstrations covering how to use the library.

Installation

You don't need this source code unless you want to modify the gem. If you just want to use the package, just run:

gem install stripe

If you want to build the gem from source:

gem build stripe.gemspec

Requirements

• Ruby 2.3+.

Bundler

If you are installing via bundler, you should be sure to use the https rubygems source in your Gemfile, as any gems fetched over http could potentially be compromised in transit and alter the code of gems fetched securely over https:

source 'https://rubygems.org'

gem 'rails'
gem 'stripe'

Usage

The library needs to be configured with your account's secret key which is available in your EwStripe Dashboard. Set EwStripe.api_key to its value:

require 'stripe'
EwStripe.api_key = 'sk_test_...'

# list customers
EwStripe::Customer.list()

# retrieve single customer
EwStripe::Customer.retrieve('cus_123456789')

Per-request Configuration

For apps that need to use multiple keys during the lifetime of a process, like one that uses EwStripe Connect, it's also possible to set a per-request key and/or account:

require "ew_stripe"

EwStripe::Customer.list(
  {},
  {
    api_key: 'sk_test_...',
    stripe_account: 'acct_...',
    stripe_version: '2018-02-28',
  }
)

EwStripe::Customer.retrieve(
  'cus_123456789',
  {
    api_key: 'sk_test_...',
    stripe_account: 'acct_...',
    stripe_version: '2018-02-28',
  }
)

EwStripe::Customer.retrieve(
  {
    id: 'cus_123456789',
    expand: %w(balance_transaction)
  },
  {
    stripe_version: '2018-02-28',
    api_key: 'sk_test_...',
  }
)

EwStripe::Customer.capture(
  'cus_123456789',
  {},
  {
    stripe_version: '2018-02-28',
    api_key: 'sk_test_...',
  }
)

Keep in mind that there are different method signatures depending on the action:

• When operating on a collection (e.g. .list, .create) the method signature is method(params, opts).
• When operating on resource (e.g. .capture, .update) the method signature is method(id, params, opts).
• One exception is that retrieve, despite being an operation on a resource, has the signature retrieve(id, opts). In addition, it will accept a Hash for the id param but will extract the id key out and use the others as options.

Accessing a response object

Get access to response objects by initializing a client and using its request method:

client = EwStripe::StripeClient.new
customer, resp = client.request do
  EwStripe::Customer.retrieve('cus_123456789',)
end
puts resp.request_id

Configuring a proxy

A proxy can be configured with EwStripe.proxy:

EwStripe.proxy = 'https://user:[email protected]:1234'

Configuring an API Version

By default, the library will use the API version pinned to the account making a request. This can be overridden with this global option:

EwStripe.api_version = '2018-02-28'

See versioning in the API reference for more information.

Configuring CA Bundles

By default, the library will use its own internal bundle of known CA certificates, but it's possible to configure your own:

EwStripe.ca_bundle_path = 'path/to/ca/bundle'

Configuring Automatic Retries

You can enable automatic retries on requests that fail due to a transient problem by configuring the maximum number of retries:

EwStripe.max_network_retries = 2

Various errors can trigger a retry, like a connection error or a timeout, and also certain API responses like HTTP status 409 Conflict.

Idempotency keys are added to requests to guarantee that retries are safe.

Configuring Timeouts

Open, read and write timeouts are configurable:

EwStripe.open_timeout = 30 # in seconds
EwStripe.read_timeout = 80
EwStripe.write_timeout = 30 # only supported on Ruby 2.6+

Please take care to set conservative read timeouts. Some API requests can take some time, and a short timeout increases the likelihood of a problem within our servers.

Logging

The library can be configured to emit logging that will give you better insight into what it's doing. The info logging level is usually most appropriate for production use, but debug is also available for more verbosity.

There are a few options for enabling it:

1. Set the environment variable STRIPE_LOG to the value debug or info:

   $ export STRIPE_LOG=info

2. Set EwStripe.log_level:

   EwStripe.log_level = EwStripe::LEVEL_INFO

Instrumentation

The library has various hooks that user code can tie into by passing a block to EwStripe::Instrumentation.subscribe to be notified about specific events.

request_begin

Invoked when an HTTP request starts. Receives RequestBeginEvent with the following properties:

• method: HTTP method. (Symbol)
• path: Request path. (String)
• user_data: A hash on which users can set arbitrary data, and which will be passed through to request_end invocations. This could be used, for example, to assign unique IDs to each request, and it'd work even if many requests are running in parallel. All subscribers share the same object for any particular request, so they must be careful to use unique keys that will not conflict with other subscribers. (Hash)

request_end

Invoked when an HTTP request finishes, regardless of whether it terminated with a success or error. Receives RequestEndEvent with the following properties:

• duration: Request duration in seconds. (Float)
• http_status: HTTP response code (Integer) if available, or nil in case of a lower level network error.
• method: HTTP method. (Symbol)
• num_retries: The number of retries. (Integer)
• path: Request path. (String)
• user_data: A hash on which users may have set arbitrary data in request_begin. See above for more information. (Hash)
• request_id. HTTP request identifier.

Example

For example:

EwStripe::Instrumentation.subscribe(:request_end) do |request_event|
  tags = {
    method: request_event.method,
    resource: request_event.path.split('/')[2],
    code: request_event.http_status,
    retries: request_event.num_retries
  }
  StatsD.distribution('stripe_request', request_event.duration, tags: tags)
end

Writing a Plugin

If you're writing a plugin that uses the library, we'd appreciate it if you identified using #set_app_info:

EwStripe.set_app_info('MyAwesomePlugin', version: '1.2.34', url: 'https://myawesomeplugin.info')

This information is passed along when the library makes calls to the EwStripe API.

Request latency telemetry

By default, the library sends request latency telemetry to EwStripe. These numbers help EwStripe improve the overall latency of its API for all users.

You can disable this behavior if you prefer:

EwStripe.enable_telemetry = false

Development

The test suite depends on stripe-mock, so make sure to fetch and run it from a background terminal (stripe-mock's README also contains instructions for installing via Homebrew and other methods):

go get -u github.com/stripe/stripe-mock
stripe-mock

Run all tests:

bundle exec rake test

Run a single test suite:

bundle exec ruby -Ilib/ test/stripe/util_test.rb

Run a single test:

bundle exec ruby -Ilib/ test/stripe/util_test.rb -n /should.convert.names.to.symbols/

Run the linter:

bundle exec rake rubocop

Update bundled CA certificates from the Mozilla cURL release:

bundle exec rake update_certs

Update the bundled stripe-mock by editing the version number found in .travis.yml.