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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
%% Copyright (c) 2012, 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.
%% @private
-module(ranch_transport).
-export([sendfile/6]).
-type socket() :: any().
-type opts() :: any().
-type sendfile_opts() :: [{chunk_size, non_neg_integer()}].
-export_type([sendfile_opts/0]).
%% Name of the transport.
-callback name() -> atom().
%% @todo -callback caps(secure | sendfile) -> boolean().
%% Atoms used to identify messages in {active, once | true} mode.
-callback messages() -> {OK::atom(), Closed::atom(), Error::atom()}.
%% Listen for connections on the given port number.
%%
%% Calling this function returns a listening socket that can then
%% be passed to accept/2 to accept connections.
%%
%% Available options may vary between transports.
%%
%% You can listen to a random port by setting the port option to 0.
%% It is then possible to retrieve this port number by calling
%% sockname/1 on the listening socket. If you are using Ranch's
%% listener API, then this port number can obtained through
%% ranch:get_port/1 instead.
-callback listen(opts()) -> {ok, socket()} | {error, atom()}.
%% Accept connections with the given listening socket.
-callback accept(socket(), timeout())
-> {ok, socket()} | {error, closed | timeout | atom() | tuple()}.
%% Experimental. Open a connection to the given host and port number.
-callback connect(string(), inet:port_number(), opts())
-> {ok, socket()} | {error, atom()}.
%% Experimental. Open a connection to the given host and port number
%% with a timeout.
-callback connect(string(), inet:port_number(), opts(), timeout())
-> {ok, socket()} | {error, atom()}.
%% Receive data from a socket in passive mode.
-callback recv(socket(), non_neg_integer(), timeout())
-> {ok, any()} | {error, closed | timeout | atom()}.
%% Send data on a socket.
-callback send(socket(), iodata()) -> ok | {error, atom()}.
%% Send a file on a socket.
-callback sendfile(socket(), file:name())
-> {ok, non_neg_integer()} | {error, atom()}.
%% Send part of a file on a socket.
-callback sendfile(socket(), file:name() | file:fd(), non_neg_integer(),
non_neg_integer()) -> {ok, non_neg_integer()} | {error, atom()}.
%% Send part of a file on a socket.
-callback sendfile(socket(), file:name() | file:fd(), non_neg_integer(),
non_neg_integer(), sendfile_opts())
-> {ok, non_neg_integer()} | {error, atom()}.
%% Set options on the given socket.
-callback setopts(socket(), opts()) -> ok | {error, atom()}.
%% Give control of the socket to a new process.
%%
%% Must be called from the process currently controlling the socket,
%% otherwise an {error, not_owner} tuple will be returned.
-callback controlling_process(socket(), pid())
-> ok | {error, closed | not_owner | atom()}.
%% Return the remote address and port of the connection.
-callback peername(socket())
-> {ok, {inet:ip_address(), inet:port_number()}} | {error, atom()}.
%% Return the local address and port of the connection.
-callback sockname(socket())
-> {ok, {inet:ip_address(), inet:port_number()}} | {error, atom()}.
%% Close the given socket.
-callback close(socket()) -> ok.
%% @doc Send part of a file on a socket.
%%
%% A fallback for transports that don't have a native sendfile implementation.
%% Note that the ordering of arguments is different from file:sendfile/5 and
%% that this function accepts either a raw file or a file name.
%%
%% @see file:sendfile/5
-spec sendfile(module(), socket(), file:filename_all() | file:fd(),
non_neg_integer(), non_neg_integer(), sendfile_opts())
-> {ok, non_neg_integer()} | {error, atom()}.
sendfile(Transport, Socket, Filename, Offset, Bytes, Opts)
when is_list(Filename) orelse is_atom(Filename)
orelse is_binary(Filename) ->
ChunkSize = chunk_size(Opts),
case file:open(Filename, [read, raw, binary]) of
{ok, RawFile} ->
_ = case Offset of
0 ->
ok;
_ ->
{ok, _} = file:position(RawFile, {bof, Offset})
end,
try
sendfile_loop(Transport, Socket, RawFile, Bytes, 0, ChunkSize)
after
ok = file:close(RawFile)
end;
{error, _Reason} = Error ->
Error
end;
sendfile(Transport, Socket, RawFile, Offset, Bytes, Opts) ->
ChunkSize = chunk_size(Opts),
Initial2 = case file:position(RawFile, {cur, 0}) of
{ok, Offset} ->
Offset;
{ok, Initial} ->
{ok, _} = file:position(RawFile, {bof, Offset}),
Initial
end,
case sendfile_loop(Transport, Socket, RawFile, Bytes, 0, ChunkSize) of
{ok, _Sent} = Result ->
{ok, _} = file:position(RawFile, {bof, Initial2}),
Result;
{error, _Reason} = Error ->
Error
end.
-spec chunk_size(sendfile_opts()) -> pos_integer().
chunk_size(Opts) ->
case lists:keyfind(chunk_size, 1, Opts) of
{chunk_size, ChunkSize}
when is_integer(ChunkSize) andalso ChunkSize > 0 ->
ChunkSize;
{chunk_size, 0} ->
16#1FFF;
false ->
16#1FFF
end.
-spec sendfile_loop(module(), socket(), file:fd(), non_neg_integer(),
non_neg_integer(), pos_integer())
-> {ok, non_neg_integer()} | {error, term()}.
sendfile_loop(_Transport, _Socket, _RawFile, Sent, Sent, _ChunkSize)
when Sent =/= 0 ->
%% All requested data has been read and sent, return number of bytes sent.
{ok, Sent};
sendfile_loop(Transport, Socket, RawFile, Bytes, Sent, ChunkSize) ->
ReadSize = read_size(Bytes, Sent, ChunkSize),
case file:read(RawFile, ReadSize) of
{ok, IoData} ->
case Transport:send(Socket, IoData) of
ok ->
Sent2 = iolist_size(IoData) + Sent,
sendfile_loop(Transport, Socket, RawFile, Bytes, Sent2,
ChunkSize);
{error, _Reason} = Error ->
Error
end;
eof ->
{ok, Sent};
{error, _Reason} = Error ->
Error
end.
-spec read_size(non_neg_integer(), non_neg_integer(), non_neg_integer()) ->
non_neg_integer().
read_size(0, _Sent, ChunkSize) ->
ChunkSize;
read_size(Bytes, Sent, ChunkSize) ->
min(Bytes - Sent, ChunkSize).
|
