Track failed proxy urls and don't request them again

This commit is contained in:
Sergey Suprunenko 2019-10-01 20:00:27 +00:00 committed by feld
parent 51b5c53988
commit c541b83bef
4 changed files with 80 additions and 9 deletions

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@ -117,6 +117,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- Mastodon API: Added an endpoint to get multiple statuses by IDs (`GET /api/v1/statuses/?ids[]=1&ids[]=2`) - Mastodon API: Added an endpoint to get multiple statuses by IDs (`GET /api/v1/statuses/?ids[]=1&ids[]=2`)
- ActivityPub: Add ActivityPub actor's `discoverable` parameter. - ActivityPub: Add ActivityPub actor's `discoverable` parameter.
- Admin API: Added moderation log filters (user/start date/end date/search/pagination) - Admin API: Added moderation log filters (user/start date/end date/search/pagination)
- Reverse Proxy: Do not retry failed requests to limit pressure on the peer
### Changed ### Changed
- Configuration: Filter.AnonymizeFilename added ability to retain file extension with custom text - Configuration: Filter.AnonymizeFilename added ability to retain file extension with custom text

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@ -102,7 +102,8 @@ defp cachex_children do
build_cachex("scrubber", limit: 2500), build_cachex("scrubber", limit: 2500),
build_cachex("idempotency", expiration: idempotency_expiration(), limit: 2500), build_cachex("idempotency", expiration: idempotency_expiration(), limit: 2500),
build_cachex("web_resp", limit: 2500), build_cachex("web_resp", limit: 2500),
build_cachex("emoji_packs", expiration: emoji_packs_expiration(), limit: 10) build_cachex("emoji_packs", expiration: emoji_packs_expiration(), limit: 10),
build_cachex("failed_proxy_url", limit: 2500)
] ]
end end

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@ -15,6 +15,7 @@ defmodule Pleroma.ReverseProxy do
@valid_resp_codes [200, 206, 304] @valid_resp_codes [200, 206, 304]
@max_read_duration :timer.seconds(30) @max_read_duration :timer.seconds(30)
@max_body_length :infinity @max_body_length :infinity
@failed_request_ttl :timer.seconds(60)
@methods ~w(GET HEAD) @methods ~w(GET HEAD)
@moduledoc """ @moduledoc """
@ -48,6 +49,8 @@ defmodule Pleroma.ReverseProxy do
* `max_read_duration` (default `#{inspect(@max_read_duration)}` ms): the total time the connection is allowed to * `max_read_duration` (default `#{inspect(@max_read_duration)}` ms): the total time the connection is allowed to
read from the remote upstream. read from the remote upstream.
* `failed_request_ttl` (default `#{inspect(@failed_request_ttl)}` ms): the time the failed request is cached and cannot be retried.
* `inline_content_types`: * `inline_content_types`:
* `true` will not alter `content-disposition` (up to the upstream), * `true` will not alter `content-disposition` (up to the upstream),
* `false` will add `content-disposition: attachment` to any request, * `false` will add `content-disposition: attachment` to any request,
@ -83,6 +86,7 @@ defmodule Pleroma.ReverseProxy do
{:keep_user_agent, boolean} {:keep_user_agent, boolean}
| {:max_read_duration, :timer.time() | :infinity} | {:max_read_duration, :timer.time() | :infinity}
| {:max_body_length, non_neg_integer() | :infinity} | {:max_body_length, non_neg_integer() | :infinity}
| {:failed_request_ttl, :timer.time() | :infinity}
| {:http, []} | {:http, []}
| {:req_headers, [{String.t(), String.t()}]} | {:req_headers, [{String.t(), String.t()}]}
| {:resp_headers, [{String.t(), String.t()}]} | {:resp_headers, [{String.t(), String.t()}]}
@ -108,7 +112,8 @@ def call(conn = %{method: method}, url, opts) when method in @methods do
opts opts
end end
with {:ok, code, headers, client} <- request(method, url, req_headers, hackney_opts), with {:ok, nil} <- Cachex.get(:failed_proxy_url_cache, url),
{:ok, code, headers, client} <- request(method, url, req_headers, hackney_opts),
:ok <- :ok <-
header_length_constraint( header_length_constraint(
headers, headers,
@ -116,12 +121,18 @@ def call(conn = %{method: method}, url, opts) when method in @methods do
) do ) do
response(conn, client, url, code, headers, opts) response(conn, client, url, code, headers, opts)
else else
{:ok, true} ->
conn
|> error_or_redirect(url, 500, "Request failed", opts)
|> halt()
{:ok, code, headers} -> {:ok, code, headers} ->
head_response(conn, url, code, headers, opts) head_response(conn, url, code, headers, opts)
|> halt() |> halt()
{:error, {:invalid_http_response, code}} -> {:error, {:invalid_http_response, code}} ->
Logger.error("#{__MODULE__}: request to #{inspect(url)} failed with HTTP status #{code}") Logger.error("#{__MODULE__}: request to #{inspect(url)} failed with HTTP status #{code}")
track_failed_url(url, code, opts)
conn conn
|> error_or_redirect( |> error_or_redirect(
@ -134,6 +145,7 @@ def call(conn = %{method: method}, url, opts) when method in @methods do
{:error, error} -> {:error, error} ->
Logger.error("#{__MODULE__}: request to #{inspect(url)} failed: #{inspect(error)}") Logger.error("#{__MODULE__}: request to #{inspect(url)} failed: #{inspect(error)}")
track_failed_url(url, error, opts)
conn conn
|> error_or_redirect(url, 500, "Request failed", opts) |> error_or_redirect(url, 500, "Request failed", opts)
@ -388,4 +400,17 @@ defp increase_read_duration(_) do
end end
defp client, do: Pleroma.ReverseProxy.Client defp client, do: Pleroma.ReverseProxy.Client
defp track_failed_url(url, code, opts) do
code = to_string(code)
ttl =
if code in ["403", "404"] or String.starts_with?(code, "5") do
Keyword.get(opts, :failed_request_ttl, @failed_request_ttl)
else
nil
end
Cachex.put(:failed_proxy_url_cache, url, true, ttl: ttl)
end
end end

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@ -42,6 +42,18 @@ defp user_agent_mock(user_agent, invokes) do
end) end)
end end
describe "reverse proxy" do
test "do not track successful request", %{conn: conn} do
user_agent_mock("hackney/1.15.1", 2)
url = "/success"
conn = ReverseProxy.call(conn, url)
assert conn.status == 200
assert Cachex.get(:failed_proxy_url_cache, url) == {:ok, nil}
end
end
describe "user-agent" do describe "user-agent" do
test "don't keep", %{conn: conn} do test "don't keep", %{conn: conn} do
user_agent_mock("hackney/1.15.1", 2) user_agent_mock("hackney/1.15.1", 2)
@ -71,9 +83,15 @@ test "length returns error if content-length more than option", %{conn: conn} do
user_agent_mock("hackney/1.15.1", 0) user_agent_mock("hackney/1.15.1", 0)
assert capture_log(fn -> assert capture_log(fn ->
ReverseProxy.call(conn, "/user-agent", max_body_length: 4) ReverseProxy.call(conn, "/huge-file", max_body_length: 4)
end) =~ end) =~
"[error] Elixir.Pleroma.ReverseProxy: request to \"/user-agent\" failed: :body_too_large" "[error] Elixir.Pleroma.ReverseProxy: request to \"/huge-file\" failed: :body_too_large"
assert {:ok, true} == Cachex.get(:failed_proxy_url_cache, "/huge-file")
assert capture_log(fn ->
ReverseProxy.call(conn, "/huge-file", max_body_length: 4)
end) == ""
end end
defp stream_mock(invokes, with_close? \\ false) do defp stream_mock(invokes, with_close? \\ false) do
@ -140,28 +158,54 @@ defp error_mock(status) when is_integer(status) do
describe "returns error on" do describe "returns error on" do
test "500", %{conn: conn} do test "500", %{conn: conn} do
error_mock(500) error_mock(500)
url = "/status/500"
capture_log(fn -> ReverseProxy.call(conn, "/status/500") end) =~ capture_log(fn -> ReverseProxy.call(conn, url) end) =~
"[error] Elixir.Pleroma.ReverseProxy: request to /status/500 failed with HTTP status 500" "[error] Elixir.Pleroma.ReverseProxy: request to /status/500 failed with HTTP status 500"
assert Cachex.get(:failed_proxy_url_cache, url) == {:ok, true}
{:ok, ttl} = Cachex.ttl(:failed_proxy_url_cache, url)
assert ttl <= 60_000
end end
test "400", %{conn: conn} do test "400", %{conn: conn} do
error_mock(400) error_mock(400)
url = "/status/400"
capture_log(fn -> ReverseProxy.call(conn, "/status/400") end) =~ capture_log(fn -> ReverseProxy.call(conn, url) end) =~
"[error] Elixir.Pleroma.ReverseProxy: request to /status/400 failed with HTTP status 400" "[error] Elixir.Pleroma.ReverseProxy: request to /status/400 failed with HTTP status 400"
assert Cachex.get(:failed_proxy_url_cache, url) == {:ok, true}
assert Cachex.ttl(:failed_proxy_url_cache, url) == {:ok, nil}
end
test "403", %{conn: conn} do
error_mock(403)
url = "/status/403"
capture_log(fn ->
ReverseProxy.call(conn, url, failed_request_ttl: :timer.seconds(120))
end) =~
"[error] Elixir.Pleroma.ReverseProxy: request to /status/403 failed with HTTP status 403"
{:ok, ttl} = Cachex.ttl(:failed_proxy_url_cache, url)
assert ttl > 100_000
end end
test "204", %{conn: conn} do test "204", %{conn: conn} do
ClientMock url = "/status/204"
|> expect(:request, fn :get, "/status/204", _, _, _ -> {:ok, 204, [], %{}} end) expect(ClientMock, :request, fn :get, _url, _, _, _ -> {:ok, 204, [], %{}} end)
capture_log(fn -> capture_log(fn ->
conn = ReverseProxy.call(conn, "/status/204") conn = ReverseProxy.call(conn, url)
assert conn.resp_body == "Request failed: No Content" assert conn.resp_body == "Request failed: No Content"
assert conn.halted assert conn.halted
end) =~ end) =~
"[error] Elixir.Pleroma.ReverseProxy: request to \"/status/204\" failed with HTTP status 204" "[error] Elixir.Pleroma.ReverseProxy: request to \"/status/204\" failed with HTTP status 204"
assert Cachex.get(:failed_proxy_url_cache, url) == {:ok, true}
assert Cachex.ttl(:failed_proxy_url_cache, url) == {:ok, nil}
end end
end end