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diff --git a/lib/tesla/adapter/gun.ex b/lib/tesla/adapter/gun.ex
index f9ac870..32871d2 100644
--- a/lib/tesla/adapter/gun.ex
+++ b/lib/tesla/adapter/gun.ex
@@ -1,274 +1,277 @@
if Code.ensure_loaded?(:gun) do
defmodule Tesla.Adapter.Gun do
@moduledoc """
Adapter for [gun] https://github.com/ninenines/gun
Remember to add `{:gun, "~> 1.3"}` to dependencies
Also, you need to recompile tesla after adding `:gun` dependency:
```
mix deps.clean tesla
mix deps.compile tesla
```
### Example usage
```
# set globally in config/config.exs
config :tesla, :adapter, Tesla.Adapter.Gun
# set per module
defmodule MyClient do
use Tesla
adapter Tesla.Adapter.Gun
end
```
### Adapter specific options:
* `timeout` - Time, while process, will wait for gun messages.
* `body_as` - What will be returned in `%Tesla.Env{}` body key. Possible values - `:plain`, `:stream`, `:chunks`. Defaults to `:plain`.
* `:plain` - as binary.
* `:stream` - as stream. If you don't want to close connection (because you want to reuse it later) pass `close_conn: false` in adapter opts.
* `:chunks` - as chunks. You can get response body in chunks using `Tesla.Adapter.Gun.read_chunk/3` function.
Processing of the chunks and checking body size must be done by yourself. Example of processing function
is in `test/tesla/adapter/gun_test.exs` - `read_body/3`. If you don't need connection later don't forget
to close it with `Tesla.Adapter.Gun.close/1`.
* `max_body` - Max response body size in bytes. Works only with `body_as: :plain`, with other settings you need to check response
body size by yourself.
* `conn` - Opened connection pid with gun. Is used for reusing gun connections.
* `close_conn` - Close connection or not after receiving full response body. Works with `body_as: :stream`. Is used for reusing gun connections.
Defaults to `true`.
### Gun options https://ninenines.eu/docs/en/gun/1.3/manual/gun/:
* `connect_timeout` - Connection timeout.
* `http_opts` - Options specific to the HTTP protocol.
* `http2_opts` - Options specific to the HTTP/2 protocol.
* `protocols` - Ordered list of preferred protocols. Defaults: [http2, http] - for :tls, [http] - for :tcp.
* `trace` - Whether to enable dbg tracing of the connection process. Should only be used during debugging. Default: false.
* `transport` - Whether to use TLS or plain TCP. The default varies depending on the port used. Port 443 defaults to tls.
All other ports default to tcp.
* `transport_opts` - Transport options. They are TCP options or TLS options depending on the selected transport. Default: [].
* `ws_opts` - Options specific to the Websocket protocol. Default: %{}.
* `compress` - Whether to enable permessage-deflate compression. This does not guarantee that compression will
be used as it is the server that ultimately decides. Defaults to false.
* `protocols` - A non-empty list enables Websocket protocol negotiation. The list of protocols will be sent
in the sec-websocket-protocol request header.
The handler module interface is currently undocumented and must be set to `gun_ws_h`.
}
"""
@behaviour Tesla.Adapter
alias Tesla.Multipart
@gun_keys [
:connect_timeout,
:http_opts,
:http2_opts,
:protocols,
:retry,
:retry_timeout,
:trace,
:transport,
:transport_opts,
:ws_opts
]
@adapter_default_timeout 1_000
@impl true
@doc false
def call(env, opts) do
with {:ok, status, headers, body} <- request(env, opts) do
{:ok, %{env | status: status, headers: format_headers(headers), body: body}}
end
end
defp format_headers(headers) do
for {key, value} <- headers do
{String.downcase(to_string(key)), to_string(value)}
end
end
defp format_method(method), do: String.upcase(to_string(method))
defp format_url(nil, nil), do: ""
defp format_url(nil, query), do: "?" <> query
defp format_url(path, nil), do: path
defp format_url(path, query), do: path <> "?" <> query
defp request(env, opts) do
request(
format_method(env.method),
Tesla.build_url(env.url, env.query),
env.headers,
env.body || "",
Tesla.Adapter.opts([close_conn: true, body_as: :plain], env, opts) |> Enum.into(%{})
)
end
defp request(method, url, headers, %Stream{} = body, opts),
do: request_stream(method, url, headers, body, opts)
defp request(method, url, headers, body, opts) when is_function(body),
do: request_stream(method, url, headers, body, opts)
defp request(method, url, headers, %Multipart{} = mp, opts) do
headers = headers ++ Multipart.headers(mp)
body = Multipart.body(mp)
request(method, url, headers, body, opts)
end
defp request(method, url, headers, body, opts) do
with {pid, f_url} <- open_conn(url, opts),
stream <- open_stream(pid, method, f_url, headers, body, false) do
read_response(pid, stream, opts)
end
end
defp request_stream(method, url, headers, body, opts) do
with {pid, f_url} <- open_conn(url, opts),
stream <- open_stream(pid, method, f_url, headers, body, true) do
read_response(pid, stream, opts)
end
end
defp open_conn(url, opts) do
uri = URI.parse(url)
opts = if uri.scheme == "https", do: Map.put(opts, :transport, :tls), else: opts
{:ok, pid} =
if opts[:conn],
do: {:ok, opts[:conn]},
else: :gun.open(to_charlist(uri.host), uri.port, Map.take(opts, @gun_keys))
{pid, format_url(uri.path, uri.query)}
end
defp open_stream(pid, method, url, headers, body, true) do
stream = :gun.request(pid, method, url, headers, "")
for data <- body, do: :ok = :gun.data(pid, stream, :nofin, data)
:gun.data(pid, stream, :fin, "")
stream
end
defp open_stream(pid, method, url, headers, body, false),
do: :gun.request(pid, method, url, headers, body)
defp read_response(pid, stream, opts) do
receive do
{:gun_response, ^pid, ^stream, :fin, status, headers} ->
close(pid)
{:ok, status, headers, ""}
{:gun_response, ^pid, ^stream, :nofin, status, headers} ->
format_response(pid, stream, opts, status, headers, opts[:body_as])
{:error, error} ->
close(pid)
{:error, error}
{:gun_up, ^pid, :http} ->
read_response(pid, stream, opts)
{:gun_error, ^pid, reason} ->
close(pid)
{:error, reason}
{:gun_down, ^pid, _, _, _, _} ->
read_response(pid, stream, opts)
{:DOWN, _, _, _, reason} ->
close(pid)
{:error, reason}
after
opts[:timeout] || @adapter_default_timeout ->
:ok = close(pid)
{:error, :timeout}
end
end
defp format_response(pid, stream, opts, status, headers, :plain) do
case read_body(pid, stream, opts) do
{:ok, body} ->
close(pid)
{:ok, status, headers, body}
{:error, error} ->
close(pid)
{:error, error}
end
end
defp format_response(pid, stream, opts, status, headers, :stream) do
stream_body =
Stream.resource(
fn -> %{pid: pid, stream: stream} end,
fn
%{pid: pid, stream: stream} ->
case read_chunk(pid, stream, opts) do
{:nofin, part} -> {[part], %{pid: pid, stream: stream}}
{:fin, body} -> {[body], %{pid: pid, final: :fin}}
end
%{pid: pid, final: :fin} ->
{:halt, %{pid: pid}}
end,
fn %{pid: pid} ->
if opts[:close_conn], do: close(pid)
end
)
{:ok, status, headers, stream_body}
end
defp format_response(pid, stream, opts, status, headers, :chunks) do
{:ok, status, headers, %{pid: pid, stream: stream, opts: Enum.into(opts, [])}}
end
+ @spec read_chunk(pid(), reference(), keyword() | map()) ::
+ {:fin, binary()} | {:nofin, binary()} | {:error, :timeout}
def read_chunk(pid, stream, opts) do
receive do
{:gun_data, ^pid, ^stream, :fin, body} ->
{:fin, body}
{:gun_data, ^pid, ^stream, :nofin, part} ->
{:nofin, part}
after
opts[:timeout] || @adapter_default_timeout ->
{:error, :timeout}
end
end
+ @spec close(pid()) :: :ok
def close(pid) do
:gun.close(pid)
end
defp read_body(pid, stream, opts, acc \\ "") do
limit = opts[:max_body]
receive do
{:gun_data, ^pid, ^stream, :fin, body} ->
check_body_size(acc, body, limit)
{:gun_data, ^pid, ^stream, :nofin, part} ->
case check_body_size(acc, part, limit) do
{:ok, acc} -> read_body(pid, stream, opts, acc)
{:error, error} -> {:error, error}
end
after
opts[:timeout] || @adapter_default_timeout ->
{:error, :timeout}
end
end
defp check_body_size(acc, part, nil), do: {:ok, acc <> part}
defp check_body_size(acc, part, limit) do
body = acc <> part
if limit - byte_size(body) >= 0 do
{:ok, body}
else
{:error, :body_too_large}
end
end
end
end

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