forked from ninenines/gun
-
Notifications
You must be signed in to change notification settings - Fork 0
/
gun_ws.erl
157 lines (144 loc) · 5.83 KB
/
gun_ws.erl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
%% Copyright (c) 2015, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-module(gun_ws).
-export([check_options/1]).
-export([name/0]).
-export([init/7]).
-export([handle/2]).
-export([close/2]).
-export([send/2]).
-export([down/1]).
-record(payload, {
type = undefined :: cow_ws:frame_type(),
rsv = undefined :: cow_ws:rsv(),
len = undefined :: non_neg_integer(),
mask_key = undefined :: cow_ws:mask_key(),
close_code = undefined :: undefined | cow_ws:close_code(),
unmasked = <<>> :: binary(),
unmasked_len = 0 :: non_neg_integer()
}).
-record(ws_state, {
owner :: pid(),
socket :: inet:socket() | ssl:sslsocket(),
transport :: module(),
buffer = <<>> :: binary(),
in = head :: head | #payload{} | close,
frag_state = undefined :: cow_ws:frag_state(),
utf8_state = 0 :: cow_ws:utf8_state(),
extensions = #{} :: cow_ws:extensions(),
handler :: module(),
handler_state :: any()
}).
check_options(Opts) ->
do_check_options(maps:to_list(Opts)).
do_check_options([]) ->
ok;
do_check_options([{compress, B}|Opts]) when B =:= true; B =:= false ->
do_check_options(Opts);
do_check_options([{default_protocol, M}|Opts]) when is_atom(M) ->
do_check_options(Opts);
do_check_options([Opt={protocols, L}|Opts]) when is_list(L) ->
case lists:usort(lists:flatten([[is_binary(B), is_atom(M)] || {B, M} <- L])) of
[true] -> do_check_options(Opts);
_ -> {error, {options, {ws, Opt}}}
end;
do_check_options([{user_opts, _}|Opts]) ->
do_check_options(Opts);
do_check_options([Opt|_]) ->
{error, {options, {ws, Opt}}}.
name() -> ws.
init(Owner, Socket, Transport, Headers, Extensions, Handler, Opts) ->
Owner ! {gun_ws_upgrade, self(), ok, Headers},
HandlerState = Handler:init(Owner, Headers, Opts),
{upgrade, ?MODULE, #ws_state{owner=Owner, socket=Socket, transport=Transport,
extensions=Extensions, handler=Handler, handler_state=HandlerState}}.
%% Do not handle anything if we received a close frame.
handle(_, State=#ws_state{in=close}) ->
State;
%% Shortcut for common case when Data is empty after processing a frame.
handle(<<>>, State=#ws_state{in=head}) ->
State;
handle(Data, State=#ws_state{buffer=Buffer, in=head, frag_state=FragState, extensions=Extensions}) ->
Data2 = << Buffer/binary, Data/binary >>,
case cow_ws:parse_header(Data2, Extensions, FragState) of
{Type, FragState2, Rsv, Len, MaskKey, Rest} ->
handle(Rest, State#ws_state{buffer= <<>>,
in=#payload{type=Type, rsv=Rsv, len=Len, mask_key=MaskKey}, frag_state=FragState2});
more ->
State#ws_state{buffer=Data2};
error ->
close({error, badframe}, State)
end;
handle(Data, State=#ws_state{in=In=#payload{type=Type, rsv=Rsv, len=Len, mask_key=MaskKey, close_code=CloseCode,
unmasked=Unmasked, unmasked_len=UnmaskedLen}, frag_state=FragState, utf8_state=Utf8State, extensions=Extensions}) ->
case cow_ws:parse_payload(Data, MaskKey, Utf8State, UnmaskedLen, Type, Len, FragState, Extensions, Rsv) of
{ok, CloseCode2, Payload, Utf8State2, Rest} ->
dispatch(Rest, State#ws_state{in=head, utf8_state=Utf8State2}, Type, << Unmasked/binary, Payload/binary >>, CloseCode2);
{ok, Payload, Utf8State2, Rest} ->
dispatch(Rest, State#ws_state{in=head, utf8_state=Utf8State2}, Type, << Unmasked/binary, Payload/binary >>, CloseCode);
{more, CloseCode2, Payload, Utf8State2} ->
State#ws_state{in=In#payload{close_code=CloseCode2, unmasked= << Unmasked/binary, Payload/binary >>,
len=Len - byte_size(Data), unmasked_len=2 + byte_size(Data)}, utf8_state=Utf8State2};
{more, Payload, Utf8State2} ->
State#ws_state{in=In#payload{unmasked= << Unmasked/binary, Payload/binary >>,
len=Len - byte_size(Data), unmasked_len=UnmaskedLen + byte_size(Data)}, utf8_state=Utf8State2};
Error = {error, _Reason} ->
close(Error, State)
end.
dispatch(Rest, State0=#ws_state{frag_state=FragState,
handler=Handler, handler_state=HandlerState0},
Type0, Payload0, CloseCode0) ->
case cow_ws:make_frame(Type0, Payload0, CloseCode0, FragState) of
ping ->
State = send(pong, State0),
handle(Rest, State);
{ping, Payload} ->
State = send({pong, Payload}, State0),
handle(Rest, State);
pong ->
handle(Rest, State0);
{pong, _} ->
handle(Rest, State0);
Frame ->
HandlerState = Handler:handle(Frame, HandlerState0),
State = State0#ws_state{handler_state=HandlerState},
case Frame of
close -> handle(Rest, State#ws_state{in=close});
{close, _, _} -> handle(Rest, State#ws_state{in=close});
{fragment, fin, _, _} -> handle(Rest, State#ws_state{frag_state=undefined});
_ -> handle(Rest, State)
end
end.
close(Reason, State) ->
case Reason of
%% @todo We need to send a close frame from gun:ws_loop on close.
% Normal when Normal =:= stop; Normal =:= timeout ->
% send({close, 1000, <<>>}, State);
owner_gone ->
send({close, 1001, <<>>}, State);
{error, badframe} ->
send({close, 1002, <<>>}, State);
{error, badencoding} ->
send({close, 1007, <<>>}, State)
end.
send(Frame, State=#ws_state{socket=Socket, transport=Transport, extensions=Extensions}) ->
Transport:send(Socket, cow_ws:masked_frame(Frame, Extensions)),
case Frame of
close -> close;
{close, _, _} -> close;
_ -> State
end.
%% Websocket has no concept of streams.
down(_) ->
{[], []}.