From d24a97f99dddc02e288da247137b41bad7e96151 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Tue, 25 Mar 2014 11:57:05 +0100
Subject: Add gun:flush/1 to easily cleanup the mailbox

It can cleanup all messages from a pid, or just the ones from a
specific stream. The latter is useful in combination with cancel/2.
---
 src/gun.erl | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'src/gun.erl')

diff --git a/src/gun.erl b/src/gun.erl
index d751b59..e4a919d 100644
--- a/src/gun.erl
+++ b/src/gun.erl
@@ -49,6 +49,9 @@
 -export([await_body/3]).
 -export([await_body/4]).
 
+%% Flushing gun messages.
+-export([flush/1]).
+
 %% Cancelling a stream.
 -export([cancel/2]).
 
@@ -287,6 +290,44 @@ await_body(ServerPid, StreamRef, Timeout, MRef, Acc) ->
 		{error, timeout}
 	end.
 
+-spec flush(pid() | reference()) -> ok.
+flush(ServerPid) when is_pid(ServerPid) ->
+	flush_pid(ServerPid);
+flush(StreamRef) ->
+	flush_ref(StreamRef).
+
+flush_pid(ServerPid) ->
+	receive
+		{gun_response, ServerPid, _, _, _, _} ->
+			flush_pid(ServerPid);
+		{gun_data, ServerPid, _, _, _} ->
+			flush_pid(ServerPid);
+		{gun_push, ServerPid, _, _, _, _, _, _} ->
+			flush_pid(ServerPid);
+		{gun_error, ServerPid, _, _} ->
+			flush_pid(ServerPid);
+		{gun_error, ServerPid, _} ->
+			flush_pid(ServerPid);
+		{'DOWN', _, process, ServerPid, _} ->
+			flush_pid(ServerPid)
+	after 0 ->
+		ok
+	end.
+
+flush_ref(StreamRef) ->
+	receive
+		{gun_response, _, StreamRef, _, _, _} ->
+			flush_ref(StreamRef);
+		{gun_data, _, StreamRef, _, _} ->
+			flush_ref(StreamRef);
+		{gun_push, _, StreamRef, _, _, _, _, _} ->
+			flush_ref(StreamRef);
+		{gun_error, _, StreamRef, _} ->
+			flush_ref(StreamRef)
+	after 0 ->
+		ok
+	end.
+
 %% Cancelling a stream.
 
 -spec cancel(pid(), reference()) -> ok.
-- 
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