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Testcontainers is an Elixir library that supports ExUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

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testcontainers lib connection.ex
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lib/connection.ex 

# SPDX-License-Identifier: MIT

defmodule Testcontainers.Connection do

  alias Testcontainers.Logger

  alias Testcontainers.Connection.DockerHostStrategyEvaluator

  alias Testcontainers.Connection.DockerHostStrategy.DockerSocketPath

  alias Testcontainers.Connection.DockerHostStrategy.DockerHostFromProperties

  alias Testcontainers.Connection.DockerHostStrategy.DockerHostFromEnv

  alias Testcontainers.Connection.DockerHostStrategy.DockerHostFromProperties

  alias DockerEngineAPI.Connection



  @api_version "v1.41"

  @timeout 300_000



  def get_connection(options \\ []) do

    docker_host_url = docker_base_url()



    Logger.log("Using docker host url: #{docker_host_url}")



    options = Keyword.merge(options, base_url: docker_host_url, recv_timeout: @timeout)



    Connection.new(options)

  end



  defp docker_base_url do

    strategies = [

      %DockerHostFromProperties{key: "tc.host"},

      %DockerHostFromEnv{},

      %DockerSocketPath{socket_paths: ["/var/run/docker.sock"]},

      %DockerHostFromProperties{key: "docker.host"},

      %DockerSocketPath{}

    ]



    case DockerHostStrategyEvaluator.run_strategies(strategies, []) do

      {:ok, "unix://" <> path} ->

        "http+unix://#{:uri_string.quote(path)}/#{@api_version}"



      {:ok, docker_host} ->

        construct_url_from_docker_host(docker_host)



      :error ->

        exit("Failed to find docker host")

    end

  end



  defp construct_url_from_docker_host(docker_host) do

    uri = URI.parse(docker_host)



    case uri do

      %URI{scheme: "tcp"} ->

        URI.to_string(%{uri | scheme: "http", path: "/#{@api_version}"})



      %URI{scheme: _, authority: _} = uri ->

        URI.to_string(%{uri | path: "/#{@api_version}"})

    end

  end

end