toshi

Toshi is a Crystal shard for building clients for JSON based apis. It includes a connection pooling, request throttling, and automatic JSON serialization and deserialization.

Installation

1. Add the dependency to your shard.yml:

   dependencies:
     toshi:
       github: spoved/toshi.cr

2. Run shards install

Usage

require "toshi"

Defining an API

First include Toshi::Api in your class. Then call define_api to define the default configuration for the API.

class MyApi
  include Toshi::Api
  define_api("api.example.com", "https", 443, "/v1", OpenSSL::SSL::VerifyMode::PEER, HTTP::Headers{
    "Content-Type" => "application/json",
    "Accept"       => "application/json",
  }, 200, 20, 0.1, 0.0)
end

At a minimum, you must provide the host. The rest of the options are optional.

class MyApi
  include Toshi::Api
  define_api "api.example.com"
end

The default options are:

• scheme: https
• port: 443
• prefix: nil
• tls_verify_mode: OpenSSL::SSL::VerifyMode::PEER
• default_headers: HTTP::Headers{ "Content-Type" => "application/json", "Accept" => "application/json" }
• sleep_time: 0.0 - the time to sleep between requests

The client pool options are:

• pool_capacity: 200 - the maximum number of clients to create
• initial_pool_size: 20 - the initial number of clients to create
• pool_timeout: 0.1 - the timeout to wait for a client to be available

Defining an API method

define_api_method defines a new API method based on the given path and method. The method name is derived from the path and method. If the path includes a variable (e.g. /users/:id, /users/:id/books/:book_id), then the method will be defined with the variables as the first arguments.

class MyApi
  include Toshi::Api
  define_api("api.example.com")

  define_api_method :get, "/users/:id", User
  define_api_method :get, "/users/:id/books/:book_id", UserBook
end

MyApi.get_users(id: 1)                   # => GET /users/1
MyApi.get_users_books(id: 1, book_id: 2) # => GET /users/1/books/2

You can also define the name of the generated method by passing it:

class MyApi
  include Toshi::Api
  define_api("api.example.com")

  define_api_method :get, "/users/:id", User, :user_method
end

MyApi.user_method(id: 1) # => GET /users/1

If no response class is given, then the response will be nil.

Contributing

1. Fork it (https://github.com/spoved/toshi.cr/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• Holden Omans - creator and maintainer