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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License at
%% http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
%% License for the specific language governing rights and limitations
%% under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developers of the Original Code are LShift Ltd,
%% Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
%% Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
%% are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
%% Technologies LLC, and Rabbit Technologies Ltd.
%%
%% Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
%% Ltd. Portions created by Cohesive Financial Technologies LLC are
%% Copyright (C) 2007-2010 Cohesive Financial Technologies
%% LLC. Portions created by Rabbit Technologies Ltd are Copyright
%% (C) 2007-2010 Rabbit Technologies Ltd.
%%
%% All Rights Reserved.
%%
%% Contributor(s): ______________________________________.
%%
-module(rabbit_framing_channel).
-include("rabbit.hrl").
-export([start_link/3, process/2, shutdown/1]).
%% internal
-export([mainloop/2]).
%%--------------------------------------------------------------------
start_link(StartFun, StartArgs, Protocol) ->
spawn_link(
fun () ->
%% we trap exits so that a normal termination of the
%% channel or reader process terminates us too.
process_flag(trap_exit, true),
mainloop(apply(StartFun, StartArgs), Protocol)
end).
process(Pid, Frame) ->
Pid ! {frame, Frame},
ok.
shutdown(Pid) ->
Pid ! terminate,
ok.
%%--------------------------------------------------------------------
read_frame(ChannelPid) ->
receive
%% converting the exit signal into one of our own ensures that
%% the reader sees the right pid (i.e. ours) when a channel
%% exits. Similarly in the other direction, though it is not
%% really relevant there since the channel is not specifically
%% watching out for reader exit signals.
{'EXIT', _Pid, Reason} -> exit(Reason);
{frame, Frame} -> Frame;
terminate -> rabbit_channel:shutdown(ChannelPid),
read_frame(ChannelPid);
Msg -> exit({unexpected_message, Msg})
end.
mainloop(ChannelPid, Protocol) ->
{method, MethodName, FieldsBin} = read_frame(ChannelPid),
Method = Protocol:decode_method_fields(MethodName, FieldsBin),
case Protocol:method_has_content(MethodName) of
true -> {ClassId, _MethodId} = Protocol:method_id(MethodName),
rabbit_channel:do(ChannelPid, Method,
collect_content(ChannelPid, ClassId,
Protocol));
false -> rabbit_channel:do(ChannelPid, Method)
end,
?MODULE:mainloop(ChannelPid, Protocol).
collect_content(ChannelPid, ClassId, Protocol) ->
case read_frame(ChannelPid) of
{content_header, ClassId, 0, BodySize, PropertiesBin} ->
Payload = collect_content_payload(ChannelPid, BodySize, []),
#content{class_id = ClassId,
properties = none,
properties_bin = PropertiesBin,
protocol = Protocol,
payload_fragments_rev = Payload};
{content_header, HeaderClassId, 0, _BodySize, _PropertiesBin} ->
rabbit_misc:protocol_error(
command_invalid,
"expected content header for class ~w, "
"got one for class ~w instead",
[ClassId, HeaderClassId]);
_ ->
rabbit_misc:protocol_error(
command_invalid,
"expected content header for class ~w, "
"got non content header frame instead",
[ClassId])
end.
collect_content_payload(_ChannelPid, 0, Acc) ->
Acc;
collect_content_payload(ChannelPid, RemainingByteCount, Acc) ->
case read_frame(ChannelPid) of
{content_body, FragmentBin} ->
collect_content_payload(ChannelPid,
RemainingByteCount - size(FragmentBin),
[FragmentBin | Acc]);
_ ->
rabbit_misc:protocol_error(
command_invalid,
"expected content body, got non content body frame instead",
[])
end.
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