/
rabbit_binary_generator.erl
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/
rabbit_binary_generator.erl
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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 Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2016 Pivotal Software, Inc. All rights reserved.
%%
-module(rabbit_binary_generator).
-include("rabbit_framing.hrl").
-include("rabbit.hrl").
-export([build_simple_method_frame/3,
build_simple_content_frames/4,
build_heartbeat_frame/0]).
-export([generate_table/1]).
-export([check_empty_frame_size/0]).
-export([ensure_content_encoded/2, clear_encoded_content/1]).
-export([map_exception/3]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-type(frame() :: [binary()]).
-spec(build_simple_method_frame/3 ::
(rabbit_channel:channel_number(), rabbit_framing:amqp_method_record(),
rabbit_types:protocol())
-> frame()).
-spec(build_simple_content_frames/4 ::
(rabbit_channel:channel_number(), rabbit_types:content(),
non_neg_integer(), rabbit_types:protocol())
-> [frame()]).
-spec(build_heartbeat_frame/0 :: () -> frame()).
-spec(generate_table/1 :: (rabbit_framing:amqp_table()) -> binary()).
-spec(check_empty_frame_size/0 :: () -> 'ok').
-spec(ensure_content_encoded/2 ::
(rabbit_types:content(), rabbit_types:protocol()) ->
rabbit_types:encoded_content()).
-spec(clear_encoded_content/1 ::
(rabbit_types:content()) -> rabbit_types:unencoded_content()).
-spec(map_exception/3 :: (rabbit_channel:channel_number(),
rabbit_types:amqp_error() | any(),
rabbit_types:protocol()) ->
{rabbit_channel:channel_number(),
rabbit_framing:amqp_method_record()}).
-endif.
%%----------------------------------------------------------------------------
build_simple_method_frame(ChannelInt, MethodRecord, Protocol) ->
MethodFields = Protocol:encode_method_fields(MethodRecord),
MethodName = rabbit_misc:method_record_type(MethodRecord),
{ClassId, MethodId} = Protocol:method_id(MethodName),
create_frame(1, ChannelInt, [<<ClassId:16, MethodId:16>>, MethodFields]).
build_simple_content_frames(ChannelInt, Content, FrameMax, Protocol) ->
#content{class_id = ClassId,
properties_bin = ContentPropertiesBin,
payload_fragments_rev = PayloadFragmentsRev} =
ensure_content_encoded(Content, Protocol),
{BodySize, ContentFrames} =
build_content_frames(PayloadFragmentsRev, FrameMax, ChannelInt),
HeaderFrame = create_frame(2, ChannelInt,
[<<ClassId:16, 0:16, BodySize:64>>,
ContentPropertiesBin]),
[HeaderFrame | ContentFrames].
build_content_frames(FragsRev, FrameMax, ChannelInt) ->
BodyPayloadMax = if FrameMax == 0 -> iolist_size(FragsRev);
true -> FrameMax - ?EMPTY_FRAME_SIZE
end,
build_content_frames(0, [], BodyPayloadMax, [],
lists:reverse(FragsRev), BodyPayloadMax, ChannelInt).
build_content_frames(SizeAcc, FramesAcc, _FragSizeRem, [],
[], _BodyPayloadMax, _ChannelInt) ->
{SizeAcc, lists:reverse(FramesAcc)};
build_content_frames(SizeAcc, FramesAcc, FragSizeRem, FragAcc,
Frags, BodyPayloadMax, ChannelInt)
when FragSizeRem == 0 orelse Frags == [] ->
Frame = create_frame(3, ChannelInt, lists:reverse(FragAcc)),
FrameSize = BodyPayloadMax - FragSizeRem,
build_content_frames(SizeAcc + FrameSize, [Frame | FramesAcc],
BodyPayloadMax, [], Frags, BodyPayloadMax, ChannelInt);
build_content_frames(SizeAcc, FramesAcc, FragSizeRem, FragAcc,
[Frag | Frags], BodyPayloadMax, ChannelInt) ->
Size = size(Frag),
{NewFragSizeRem, NewFragAcc, NewFrags} =
if Size == 0 -> {FragSizeRem, FragAcc, Frags};
Size =< FragSizeRem -> {FragSizeRem - Size, [Frag | FragAcc], Frags};
true -> <<Head:FragSizeRem/binary, Tail/binary>> =
Frag,
{0, [Head | FragAcc], [Tail | Frags]}
end,
build_content_frames(SizeAcc, FramesAcc, NewFragSizeRem, NewFragAcc,
NewFrags, BodyPayloadMax, ChannelInt).
build_heartbeat_frame() ->
create_frame(?FRAME_HEARTBEAT, 0, <<>>).
create_frame(TypeInt, ChannelInt, Payload) ->
[<<TypeInt:8, ChannelInt:16, (iolist_size(Payload)):32>>, Payload,
?FRAME_END].
%% table_field_to_binary supports the AMQP 0-8/0-9 standard types, S,
%% I, D, T and F, as well as the QPid extensions b, d, f, l, s, t, x,
%% and V.
table_field_to_binary({FName, T, V}) ->
[short_string_to_binary(FName) | field_value_to_binary(T, V)].
field_value_to_binary(longstr, V) -> [$S | long_string_to_binary(V)];
field_value_to_binary(signedint, V) -> [$I, <<V:32/signed>>];
field_value_to_binary(decimal, V) -> {Before, After} = V,
[$D, Before, <<After:32>>];
field_value_to_binary(timestamp, V) -> [$T, <<V:64>>];
field_value_to_binary(table, V) -> [$F | table_to_binary(V)];
field_value_to_binary(array, V) -> [$A | array_to_binary(V)];
field_value_to_binary(byte, V) -> [$b, <<V:8/signed>>];
field_value_to_binary(double, V) -> [$d, <<V:64/float>>];
field_value_to_binary(float, V) -> [$f, <<V:32/float>>];
field_value_to_binary(long, V) -> [$l, <<V:64/signed>>];
field_value_to_binary(short, V) -> [$s, <<V:16/signed>>];
field_value_to_binary(bool, V) -> [$t, if V -> 1; true -> 0 end];
field_value_to_binary(binary, V) -> [$x | long_string_to_binary(V)];
field_value_to_binary(unsignedbyte, V) -> [$B, <<V:8/unsigned>>];
field_value_to_binary(unsignedshort, V) -> [$u, <<V:16/unsigned>>];
field_value_to_binary(unsignedint, V) -> [$i, <<V:32/unsigned>>];
field_value_to_binary(void, _V) -> [$V].
table_to_binary(Table) when is_list(Table) ->
BinTable = generate_table_iolist(Table),
[<<(iolist_size(BinTable)):32>> | BinTable].
array_to_binary(Array) when is_list(Array) ->
BinArray = generate_array_iolist(Array),
[<<(iolist_size(BinArray)):32>> | BinArray].
generate_table(Table) when is_list(Table) ->
list_to_binary(generate_table_iolist(Table)).
generate_table_iolist(Table) ->
lists:map(fun table_field_to_binary/1, Table).
generate_array_iolist(Array) ->
lists:map(fun ({T, V}) -> field_value_to_binary(T, V) end, Array).
short_string_to_binary(String) ->
Len = string_length(String),
if Len < 256 -> [<<Len:8>>, String];
true -> exit(content_properties_shortstr_overflow)
end.
long_string_to_binary(String) ->
Len = string_length(String),
[<<Len:32>>, String].
string_length(String) when is_binary(String) -> size(String);
string_length(String) -> length(String).
check_empty_frame_size() ->
%% Intended to ensure that EMPTY_FRAME_SIZE is defined correctly.
case iolist_size(create_frame(?FRAME_BODY, 0, <<>>)) of
?EMPTY_FRAME_SIZE -> ok;
ComputedSize -> exit({incorrect_empty_frame_size,
ComputedSize, ?EMPTY_FRAME_SIZE})
end.
ensure_content_encoded(Content = #content{properties_bin = PropBin,
protocol = Protocol}, Protocol)
when PropBin =/= none ->
Content;
ensure_content_encoded(Content = #content{properties = none,
properties_bin = PropBin,
protocol = Protocol}, Protocol1)
when PropBin =/= none ->
Props = Protocol:decode_properties(Content#content.class_id, PropBin),
Content#content{properties = Props,
properties_bin = Protocol1:encode_properties(Props),
protocol = Protocol1};
ensure_content_encoded(Content = #content{properties = Props}, Protocol)
when Props =/= none ->
Content#content{properties_bin = Protocol:encode_properties(Props),
protocol = Protocol}.
clear_encoded_content(Content = #content{properties_bin = none,
protocol = none}) ->
Content;
clear_encoded_content(Content = #content{properties = none}) ->
%% Only clear when we can rebuild the properties_bin later in
%% accordance to the content record definition comment - maximum
%% one of properties and properties_bin can be 'none'
Content;
clear_encoded_content(Content = #content{}) ->
Content#content{properties_bin = none, protocol = none}.
%% NB: this function is also used by the Erlang client
map_exception(Channel, Reason, Protocol) ->
{SuggestedClose, ReplyCode, ReplyText, FailedMethod} =
lookup_amqp_exception(Reason, Protocol),
{ClassId, MethodId} = case FailedMethod of
{_, _} -> FailedMethod;
none -> {0, 0};
_ -> Protocol:method_id(FailedMethod)
end,
case SuggestedClose orelse (Channel == 0) of
true -> {0, #'connection.close'{reply_code = ReplyCode,
reply_text = ReplyText,
class_id = ClassId,
method_id = MethodId}};
false -> {Channel, #'channel.close'{reply_code = ReplyCode,
reply_text = ReplyText,
class_id = ClassId,
method_id = MethodId}}
end.
lookup_amqp_exception(#amqp_error{name = Name,
explanation = Expl,
method = Method},
Protocol) ->
{ShouldClose, Code, Text} = Protocol:lookup_amqp_exception(Name),
ExplBin = amqp_exception_explanation(Text, Expl),
{ShouldClose, Code, ExplBin, Method};
lookup_amqp_exception(Other, Protocol) ->
rabbit_log:warning("Non-AMQP exit reason '~p'~n", [Other]),
{ShouldClose, Code, Text} = Protocol:lookup_amqp_exception(internal_error),
{ShouldClose, Code, Text, none}.
amqp_exception_explanation(Text, Expl) ->
ExplBin = list_to_binary(Expl),
CompleteTextBin = <<Text/binary, " - ", ExplBin/binary>>,
if size(CompleteTextBin) > 255 -> <<CompleteTextBin:252/binary, "...">>;
true -> CompleteTextBin
end.