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lib/http/client.ex
defmodule Http.Client do
@moduledoc """
The single seam between fnord and the HTTP transport (HTTPoison/hackney).
Everything that talks to the network - `Http`'s retrying JSON helpers and
the MCP OAuth/discovery modules that need raw control over timeouts and
status handling - goes through `impl/0` rather than calling HTTPoison
directly. That keeps the transport injectable per process tree: tests
override `:http_client` with a Mox mock (see `Fnord.TestCase`), making the
network structurally unreachable from the suite, while production resolves
to this module's passthrough implementation.
The callback shapes mirror HTTPoison's so call sites keep matching on
`%HTTPoison.Response{}` / `%HTTPoison.Error{}`; this module deliberately
adds no behavior of its own.
"""
@type url :: String.t()
@type headers :: [{String.t(), String.t()}]
@type body :: iodata()
@type opts :: keyword()
@type result ::
{:ok,
HTTPoison.Response.t() | HTTPoison.AsyncResponse.t() | HTTPoison.MaybeRedirect.t()}
| {:error, HTTPoison.Error.t()}
@callback get(url, headers, opts) :: result
@callback post(url, body, headers, opts) :: result
@callback head(url, headers, opts) :: result
@behaviour Http.Client
@impl Http.Client
def get(url, headers, opts), do: HTTPoison.get(url, headers, opts)
@impl Http.Client
def post(url, body, headers, opts), do: HTTPoison.post(url, body, headers, opts)
@impl Http.Client
def head(url, headers, opts), do: HTTPoison.head(url, headers, opts)
@doc """
Returns the current HTTP transport module. Overridden per process tree via
the `:http_client` config key for unit testing. See `Fnord.TestCase`.
"""
@spec impl() :: module()
def impl() do
Services.Globals.get_env(:fnord, :http_client) || __MODULE__
end
end