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diff --git a/lib/tesla/adapter/gun.ex b/lib/tesla/adapter/gun.ex
index 633aaa3..f3ea2c8 100644
--- a/lib/tesla/adapter/gun.ex
+++ b/lib/tesla/adapter/gun.ex
@@ -1,495 +1,496 @@
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.
In version 1.3 gun sends `host` header with port. Fixed in master branch.
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` - `Tesla.Adapter.GunTest.read_body/4`. 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. Is used for reusing gun connections. Defaults to `true`.
- `:certificates_verification` - Add SSL certificates verification. [erlang-certifi](https://github.com/certifi/erlang-certifi) [ssl_verify_fun.erl](https://github.com/deadtrickster/ssl_verify_fun.erl)
- `:proxy` - Proxy for requests. **Socks proxy are supported only for gun master branch**. Examples: `{'localhost', 1234}`, `{{127, 0, 0, 1}, 1234}`, `{:socks5, 'localhost', 1234}`.
## [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: `[]`. Gun version: 1.3
- `:tls_opts` - TLS transport options. Default: `[]`. Gun from master branch.
- `:tcp_opts` - TCP trasnport options. Default: `[]`. Gun from master branch.
- `:socks_opts` - Options for socks. Default: `[]`. Gun from master branch.
- `: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,
:socks_opts,
:ws_opts
]
@adapter_default_timeout 1_000
@impl Tesla.Adapter
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
@doc """
Reads chunk of the response body.
Returns `{:fin, binary()}` if all body received, otherwise returns `{:nofin, binary()}`.
"""
@spec read_chunk(pid(), reference(), keyword() | map()) ::
{:fin, binary()} | {:nofin, binary()} | {:error, atom()}
def read_chunk(pid, stream, opts) do
receive do
{:gun_data, ^pid, ^stream, :fin, body} ->
if opts[:close_conn], do: close(pid)
{:fin, body}
{:gun_data, ^pid, ^stream, :nofin, part} ->
{:nofin, part}
{:DOWN, _, _, _, reason} ->
if opts[:close_conn], do: close(pid)
{:error, reason}
after
opts[:timeout] || @adapter_default_timeout ->
{:error, :recv_chunk_timeout}
end
end
@doc """
Brutally close the `gun` connection.
"""
@spec close(pid()) :: :ok
defdelegate close(pid), to: :gun
defp format_headers(headers) do
for {key, value} <- headers do
{String.downcase(to_string(key)), to_string(value)}
end
end
defp request(env, opts) do
request(
Tesla.Adapter.Shared.format_method(env.method),
Tesla.build_url(env.url, env.query),
format_headers(env.headers),
env.body || "",
Tesla.Adapter.opts(
[close_conn: true, body_as: :plain, send_body: :at_once, receive: true],
env,
opts
)
|> Enum.into(%{})
)
end
defp request(method, url, headers, %Stream{} = body, opts),
do: request_stream(method, url, headers, body, Map.put(opts, :send_body, :stream))
defp request(method, url, headers, body, opts) when is_function(body),
do: request_stream(method, url, headers, body, Map.put(opts, :send_body, :stream))
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: do_request(method, url, headers, body, opts)
defp request_stream(method, url, headers, body, opts),
do: do_request(method, url, headers, body, opts)
defp do_request(method, url, headers, body, opts) do
with uri <- URI.parse(url),
path <- Tesla.Adapter.Shared.prepare_path(uri.path, uri.query),
opts <- check_original(uri, opts),
{:ok, pid, opts} <- open_conn(uri, opts),
stream <- open_stream(pid, method, path, headers, body, opts) do
read_response(pid, stream, opts)
end
end
defp check_original(%URI{host: host, port: port, scheme: scheme}, %{conn: conn} = opts) do
matches? =
try do
# sometimes :gun.info can raise MatchError
info = :gun.info(conn)
conn_host =
case :inet.ntoa(info.origin_host) do
{:error, :einval} -> info.origin_host
ip -> ip
end
conn_scheme =
case :gun.info(conn) do
# support for gun master branch, which has `origin_scheme` in connection info
%{origin_scheme: scheme} -> scheme
- info -> if info.transport == :tls, do: "https", else: "http"
+ %{transport: :tls} -> "https"
+ _ -> "http"
end
conn_scheme == scheme and to_string(conn_host) == host and
info.origin_port == port
rescue
MatchError -> false
end
Map.put(opts, :original_matches, matches?)
end
defp check_original(_uri, opts), do: opts
defp open_conn(_uri, %{conn: conn, original_matches: true} = opts) do
{:ok, conn, Map.put(opts, :receive, false)}
end
defp open_conn(uri, %{conn: conn, original_matches: false} = opts) do
# current url is different from the original, so we can't use transferred connection
opts =
opts
|> Map.put_new(:old_conn, conn)
|> Map.delete(:conn)
open_conn(uri, opts)
end
defp open_conn(uri, opts) do
opts =
if uri.scheme == "https" do
Map.put(opts, :transport, :tls)
else
opts
end
tls_opts =
opts
|> Map.get(:tls_opts, [])
|> Keyword.merge(Map.get(opts, :transport_opts, []))
tls_opts =
with "https" <- uri.scheme,
false <- opts[:original_matches] do
# current url is different from the original, so we can't use verify_fun for https requests
Keyword.delete(tls_opts, :verify_fun)
else
_ -> tls_opts
end
# Support for gun master branch where transport_opts, were splitted to tls_opts and tcp_opts
# https://github.com/ninenines/gun/blob/491ddf58c0e14824a741852fdc522b390b306ae2/doc/src/manual/gun.asciidoc#changelog
tls_opts =
with "https" <- uri.scheme,
true <- opts[:certificates_verification] do
security_opts = [
verify: :verify_peer,
cacertfile: CAStore.file_path(),
depth: 20,
reuse_sessions: false,
verify_fun:
{&:ssl_verify_hostname.verify_fun/3, [check_hostname: domain_or_fallback(uri.host)]}
]
Keyword.merge(security_opts, tls_opts)
else
_ -> tls_opts
end
gun_opts = Map.take(opts, @gun_keys)
with {:ok, pid} <- do_open_conn(uri, opts, gun_opts, tls_opts) do
# If there were redirects, and passed `closed_conn: false`, we need to close opened connections to these intermediate hosts.
{:ok, pid, Map.put(opts, :close_conn, true)}
end
end
defp do_open_conn(uri, %{proxy: {proxy_host, proxy_port}}, gun_opts, tls_opts) do
connect_opts =
uri
|> tunnel_opts()
|> tunnel_tls_opts(uri.scheme, tls_opts)
with {:ok, pid} <- :gun.open(proxy_host, proxy_port, gun_opts),
{:ok, _} <- :gun.await_up(pid),
stream <- :gun.connect(pid, connect_opts),
{:response, :fin, 200, _} <- :gun.await(pid, stream) do
{:ok, pid}
end
end
defp do_open_conn(uri, %{proxy: {proxy_type, proxy_host, proxy_port}}, gun_opts, tls_opts) do
version =
proxy_type
|> to_string()
|> String.last()
|> case do
"4" -> 4
_ -> 5
end
socks_opts =
uri
|> tunnel_opts()
|> tunnel_tls_opts(uri.scheme, tls_opts)
|> Map.put(:version, version)
gun_opts =
gun_opts
|> Map.put(:protocols, [:socks])
|> Map.update(:socks_opts, socks_opts, &Map.merge(socks_opts, &1))
with {:ok, pid} <- :gun.open(proxy_host, proxy_port, gun_opts),
{:ok, _} <- :gun.await_up(pid) do
{:ok, pid}
else
{:error, {:options, {:protocols, [:socks]}}} ->
{:error, "socks protocol is not supported"}
error ->
error
end
end
defp do_open_conn(uri, opts, gun_opts, tls_opts) do
tcp_opts = Map.get(opts, :tcp_opts, [])
# if gun used from master
opts_with_master_keys =
gun_opts
|> Map.put(:tls_opts, tls_opts)
|> Map.put(:tcp_opts, tcp_opts)
{_type, host} = domain_or_ip(uri.host)
with {:ok, pid} <- gun_open(host, uri.port, opts_with_master_keys, opts) do
{:ok, pid}
else
{:error, {:options, {key, _}}} when key in [:tcp_opts, :tls_opts] ->
gun_open(host, uri.port, Map.put(gun_opts, :transport_opts, tls_opts), opts)
error ->
error
end
end
defp gun_open(host, port, gun_opts, opts) do
with {:ok, pid} <- :gun.open(host, port, gun_opts),
{:receive, true, pid} <- {:receive, opts[:receive], pid},
{:ok, _} <- :gun.await_up(pid) do
{:ok, pid}
else
{:receive, false, pid} ->
{:ok, pid}
error ->
error
end
end
defp tunnel_opts(uri) do
{_type, host} = domain_or_ip(uri.host)
%{host: host, port: uri.port}
end
defp tunnel_tls_opts(opts, "https", tls_opts) do
http2_opts = %{protocols: [:http2], transport: :tls, tls_opts: tls_opts}
Map.merge(opts, http2_opts)
end
defp tunnel_tls_opts(opts, _, _), do: opts
defp open_stream(pid, method, path, headers, body, opts) do
req_opts = %{reply_to: opts[:reply_to] || self()}
open_stream(pid, method, path, headers, body, req_opts, opts[:send_body])
end
defp open_stream(pid, method, path, headers, body, req_opts, :stream) do
stream = :gun.request(pid, method, path, headers, "", req_opts)
for data <- body, do: :ok = :gun.data(pid, stream, :nofin, data)
:gun.data(pid, stream, :fin, "")
stream
end
defp open_stream(pid, method, path, headers, body, req_opts, :at_once),
do: :gun.request(pid, method, path, headers, body, req_opts)
defp read_response(pid, stream, opts) do
receive? = opts[:receive]
receive do
{:gun_response, ^pid, ^stream, :fin, status, headers} ->
if opts[:close_conn], do: close(pid)
{:ok, status, headers, ""}
{:gun_response, ^pid, ^stream, :nofin, status, headers} ->
format_response(pid, stream, opts, status, headers, opts[:body_as])
{:gun_up, ^pid, _protocol} when receive? ->
read_response(pid, stream, opts)
{:gun_error, ^pid, reason} ->
if opts[:close_conn], do: close(pid)
{:error, reason}
{:gun_down, ^pid, _, _, _, _} when receive? ->
read_response(pid, stream, opts)
{:DOWN, _, _, _, reason} ->
if opts[:close_conn], do: close(pid)
{:error, reason}
after
opts[:timeout] || @adapter_default_timeout ->
if opts[:close_conn], do: :ok = close(pid)
{:error, :recv_response_timeout}
end
end
defp format_response(pid, stream, opts, status, headers, :plain) do
case read_body(pid, stream, opts) do
{:ok, body} ->
if opts[:close_conn], do: close(pid)
{:ok, status, headers, body}
{:error, error} ->
if opts[:close_conn] do
close(pid)
else
# prevent gun sending messages to owner process, if body is too large and connection is not closed
:ok = :gun.flush(stream)
end
{: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
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} ->
with {:ok, acc} <- check_body_size(acc, part, limit) do
read_body(pid, stream, opts, acc)
end
{:DOWN, _, _, _, reason} ->
{:error, reason}
after
opts[:timeout] || @adapter_default_timeout ->
{:error, :recv_body_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
defp domain_or_fallback(host) do
case domain_or_ip(host) do
{:domain, domain} -> domain
{:ip, _ip} -> to_charlist(host)
end
end
defp domain_or_ip(host) do
charlist = to_charlist(host)
case :inet.parse_address(charlist) do
{:error, :einval} ->
{:domain, :idna.encode(charlist)}
{:ok, ip} when is_tuple(ip) and tuple_size(ip) in [4, 8] ->
{:ip, ip}
end
end
end
end

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