Make URL target a config option to allow for easier local testing and mocking

[Ryan Daigle]

Describe the feature or improvement you're requesting

I would like to be able use Bypass, or similar, to write local integrations tests without having to hit the actual OpenAI API. Key to this is the ability to set openai.ex's URL, currently hardcoded as @openai_url within OpenAI.Config.

I would like to propose that the openai_url be overridable by a new api_url config option:

config :openai,
  api_key: "your-api-key",
  organization_key: "your-organization-key",
  api_url: "http://localhost/",
  http_options: [recv_timeout: 2_000] 

This could then be overridden in a test setup block like so:

  setup %{conn: conn} do

    # Setup mock OpenAI server
    bypass = Bypass.open()
    Application.put_env(:openai, :api_url, "http://localhost:#{bypass.port}/")

    # ...

    {:ok, bypass: bypass, conn: conn}
  end

Thoughts?

Additional context

No response

[Marco Gallo]

Hey, thanks for the suggestion and for the contribution! I merged your PR, and it is released in 0.4.0

Release log: https://github.com/mgallo/openai.ex/releases/tag/v0.4.0
Hex.pm: https://hexdocs.pm/openai/0.4.0/api-reference.html

[Ryan Daigle]

🙏