Graphito

GraphQL client for Elixir.

Table of Contents

• Installation
• Configuration
• Usage

Installation

Add to dependencies in your mix.exs file...

def deps do
  [{:graphito, "~> 0.2.0"}]
end

...and run:

mix deps.get

Configuration

You will have to configure a url for the GraphQL server.

config :graphito,
  url: "a_graphql_host"

Additionally, headers can be configured and they will be sent in all requests.

config :graphito,
  headers: [{"this_header", "is_always_to_be_send"}]

Usage

Run any GraphQL operation (a query or mutation):

iex> Graphito.run("""
  query {
    jedis {
      name
    }
  }
  """)

%Graphito.Response{data: %{"jedis" => [%{"name" => "luke"}]}, status: 200, errors: nil, headers: [{"content-type", "application/json"}]}

A query response can be mapper to a given struct:

iex> Graphito.run("""
  query {
    jedis {
      name
      friends {
        name
      }
    }
  }
  """, as: %Jedi{friends: %Jedi{}})

%Graphito.Response{data: [%Jedi{name: "Luke", friends: [%Jedi{name: "Yoda"}]}, %Jedi{name: "Leia", friends: [%Jedi{name: "Hans"}]}]}, status: 200, errors: nil, headers: [{"content-type", "application/json"}]}

If an operation fails the errors are parsed and returned:

iex> Graphito.run("""
  query {
    jedis {
      lightzaber
    }
  }
  """)

%Graphito.Response{data: nil, status: 200, errors: [%{"message" => "Cannot query field \"lightzaber\" on type \"Jedi\". Did you mean \"lightsaber\"?"}], headers: [{"content-type", "application/json"}]}

iex> Graphito.run("""
  query {
    jedis {
      lightsaber
    }
  }
  """)

%Graphito.Response{data: nil, status: 200, errors: [%{"message" => "Third party server timeout", "code" => 503}], headers: [{"content-type", "application/json"}]}

If something fails an error is returned:

iex> Graphito.run("""
  query {
    jedis {
      lightzaber
    }
  }
  """)

%Graphito.Response.Error{reason: :timeout, errors: [%{"message" => "Failed to fetch GraphQL response"}], headers: []}