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Monthly Downloads: 45,532
Programming language: Elixir
License: ISC License
Tags: HTTP    
Latest version: v5.0.0

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README

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A GraphQL client for Elixir.

Index

Installation

def deps do
  [
    {:neuron, "~> 5.0.0"}
  ]
end

JSON library

Neuron defaults to using Jason for JSON encoding and decoding. To use Jason, add it to your deps:

{:jason, "~> 1.1"}

It is also possible to customize which JSON library that is used:

Neuron.Config.set(json_library: AnotherJSONLibrary)

Connection

Neuron defaults to using HTTP(S) protocol with HTTPoison for Connecting to GraphQL endpoint. You can however customize that behaviour, by providing custom library, which should implement Neuron.Connection behaviour:

defmodule MyConnection do
  @behaviour Neuron.Connection

  @impl Neuron.Connection
  def call(body, options) do
    IO.inspect("NEURON CALLED")
    Neuron.Connection.Http.call(body, options)
  end
end

Then set it up in config:

Neuron.Config.set(connection_module: MyConnection)

Usage

iex> Neuron.Config.set(url: "https://example.com/graph")

iex> Neuron.query("""
      {
        films {
          count
        }
      }
    """)

Response will be:

{:ok, %Neuron.Response{body: %{"data" => %{"films" => %{ "count": 123 }}}, status_code: 200, headers: []}}

You can also run mutations:

iex> Neuron.query("""
      mutation createUser($name: String!) {
        createUser(name: $name) {
          id
          name
        }
      }
    """,
    %{name: "uesteibar"}
    )

You can also set url and headers as shown below:

iex> Neuron.query("""
      mutation createUser($name: String!) {
        createUser(name: $name) {
          id
          name
        }
      }
    """,
    %{name: "uesteibar"},
    url: "https://example.com/graph",
    headers: [authorization: "Bearer <token>"]
    )

Overriding HTTP Timeout

HTTPoison default timeout is 5000ms, in case we need to handle longer timeout, using default Neuron.Connection module, we could set connection_opts which will be passed to HTTPoison. So to override timeout to 15000ms, we could do:

iex> Neuron.Config.set(url: "https://example.com/graph", connection_opts: [recv_timeout: 15_000])

iex> Neuron.query("""
      {
        films {
          count
        }
      }
    """)

We can also set the timeout for a single request by passing the connection_opts to Neuron.query/3 instead:

iex> Neuron.query("...", %{}, connection_opts: [recv_timeout: 15_000])

More extensive documentation can be found at https://hexdocs.pm/neuron.

Running locally

Clone the repository:

git clone [email protected]:uesteibar/neuron.git

Install dependencies:

cd neuron
mix deps.get

To run the tests:

mix test

Style guide

Code is formatted with mix format and mix credo should not show warnings.

To format the code and run static code analysis with credo

mix format
mix credo

Contributing

Pull requests are always welcome =)

The project uses standard-changelog to update the Changelog with each commit message and upgrade the package version. For that reason every contribution should have a title and body that follows the conventional commits standard conventions (e.g. feat(connection): Make it smarter than Jarvis).

To make this process easier, you can do the following:

Install commitizen and cz-conventional-changelog globally:

npm i -g commitizen cz-conventional-changelog

Save cz-conventional-changelog as default:

echo '{ "path": "cz-conventional-changelog" }' > ~/.czrc

Instead of git commit, you can now run:

git cz

and follow the instructions to generate the commit message.

Copyright and License

Copyright (c) 2017 Unai Esteibar

This software is released under the [Internet Systems Consortium License](./LICENSE.md).


*Note that all licence references and agreements mentioned in the neuron README section above are relevant to that project's source code only.