akkoma/lib/pleroma/http/http.ex
rinpatch d34fe2840d HTTP: radically simplify pool checkin/checkout
Use a custom tesla middleware instead of adapter helper function +
custom redirect middleware.

This will also fix "Client died before releasing the connection"
messages when the request pool is overloaded. Since the checkout is
now done after passing ConcurrentLimiter.

This is technically less efficient, since the connection needs to be
checked in/out every time the middleware is left or entered respectively.
But I don't think the nanoseconds we might lose on redirects
to the same host are worth the complexity.
2020-09-03 23:44:13 +03:00

110 lines
3.2 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.HTTP do
@moduledoc """
Wrapper for `Tesla.request/2`.
"""
alias Pleroma.HTTP.AdapterHelper
alias Pleroma.HTTP.Request
alias Pleroma.HTTP.RequestBuilder, as: Builder
alias Tesla.Client
alias Tesla.Env
require Logger
@type t :: __MODULE__
@type method() :: :get | :post | :put | :delete | :head
@doc """
Performs GET request.
See `Pleroma.HTTP.request/5`
"""
@spec get(Request.url() | nil, Request.headers(), keyword()) ::
nil | {:ok, Env.t()} | {:error, any()}
def get(url, headers \\ [], options \\ [])
def get(nil, _, _), do: nil
def get(url, headers, options), do: request(:get, url, "", headers, options)
@spec head(Request.url(), Request.headers(), keyword()) :: {:ok, Env.t()} | {:error, any()}
def head(url, headers \\ [], options \\ []), do: request(:head, url, "", headers, options)
@doc """
Performs POST request.
See `Pleroma.HTTP.request/5`
"""
@spec post(Request.url(), String.t(), Request.headers(), keyword()) ::
{:ok, Env.t()} | {:error, any()}
def post(url, body, headers \\ [], options \\ []),
do: request(:post, url, body, headers, options)
@doc """
Builds and performs http request.
# Arguments:
`method` - :get, :post, :put, :delete, :head
`url` - full url
`body` - request body
`headers` - a keyworld list of headers, e.g. `[{"content-type", "text/plain"}]`
`options` - custom, per-request middleware or adapter options
# Returns:
`{:ok, %Tesla.Env{}}` or `{:error, error}`
"""
@spec request(method(), Request.url(), String.t(), Request.headers(), keyword()) ::
{:ok, Env.t()} | {:error, any()}
def request(method, url, body, headers, options) when is_binary(url) do
uri = URI.parse(url)
adapter_opts = AdapterHelper.options(uri, options[:adapter] || [])
options = put_in(options[:adapter], adapter_opts)
params = options[:params] || []
request = build_request(method, headers, options, url, body, params)
adapter = Application.get_env(:tesla, :adapter)
client = Tesla.client(adapter_middlewares(adapter), adapter)
maybe_limit(
fn ->
request(client, request)
end,
adapter,
adapter_opts
)
end
@spec request(Client.t(), keyword()) :: {:ok, Env.t()} | {:error, any()}
def request(client, request), do: Tesla.request(client, request)
defp build_request(method, headers, options, url, body, params) do
Builder.new()
|> Builder.method(method)
|> Builder.headers(headers)
|> Builder.opts(options)
|> Builder.url(url)
|> Builder.add_param(:body, :body, body)
|> Builder.add_param(:query, :query, params)
|> Builder.convert_to_keyword()
end
@prefix Pleroma.Gun.ConnectionPool
defp maybe_limit(fun, Tesla.Adapter.Gun, opts) do
ConcurrentLimiter.limit(:"#{@prefix}.#{opts[:pool] || :default}", fun)
end
defp maybe_limit(fun, _, _) do
fun.()
end
defp adapter_middlewares(Tesla.Adapter.Gun) do
[Tesla.Middleware.FollowRedirects, Pleroma.Tesla.Middleware.ConnectionPool]
end
defp adapter_middlewares(_), do: []
end