/
rabbit_command_assembler.erl
137 lines (118 loc) · 5.82 KB
/
rabbit_command_assembler.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
%% 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) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_command_assembler).
-include("rabbit_framing.hrl").
-include("rabbit.hrl").
-export([analyze_frame/3, init/1, process/2]).
%%----------------------------------------------------------------------------
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-export_type([frame/0]).
-type(frame_type() :: ?FRAME_METHOD | ?FRAME_HEADER | ?FRAME_BODY |
?FRAME_OOB_METHOD | ?FRAME_OOB_HEADER | ?FRAME_OOB_BODY |
?FRAME_TRACE | ?FRAME_HEARTBEAT).
-type(protocol() :: rabbit_framing:protocol()).
-type(method() :: rabbit_framing:amqp_method_record()).
-type(class_id() :: rabbit_framing:amqp_class_id()).
-type(weight() :: non_neg_integer()).
-type(body_size() :: non_neg_integer()).
-type(content() :: rabbit_types:undecoded_content()).
-type(frame() ::
{'method', rabbit_framing:amqp_method_name(), binary()} |
{'content_header', class_id(), weight(), body_size(), binary()} |
{'content_body', binary()}).
-type(state() ::
{'method', protocol()} |
{'content_header', method(), class_id(), protocol()} |
{'content_body', method(), body_size(), class_id(), protocol()}).
-spec(analyze_frame/3 :: (frame_type(), binary(), protocol()) ->
frame() | 'heartbeat' | 'error').
-spec(init/1 :: (protocol()) -> {ok, state()}).
-spec(process/2 :: (frame(), state()) ->
{ok, state()} |
{ok, method(), state()} |
{ok, method(), content(), state()} |
{error, rabbit_types:amqp_error()}).
-endif.
%%--------------------------------------------------------------------
analyze_frame(?FRAME_METHOD,
<<ClassId:16, MethodId:16, MethodFields/binary>>,
Protocol) ->
MethodName = Protocol:lookup_method_name({ClassId, MethodId}),
{method, MethodName, MethodFields};
analyze_frame(?FRAME_HEADER,
<<ClassId:16, Weight:16, BodySize:64, Properties/binary>>,
_Protocol) ->
{content_header, ClassId, Weight, BodySize, Properties};
analyze_frame(?FRAME_BODY, Body, _Protocol) ->
{content_body, Body};
analyze_frame(?FRAME_HEARTBEAT, <<>>, _Protocol) ->
heartbeat;
analyze_frame(_Type, _Body, _Protocol) ->
error.
init(Protocol) -> {ok, {method, Protocol}}.
process({method, MethodName, FieldsBin}, {method, Protocol}) ->
try
Method = Protocol:decode_method_fields(MethodName, FieldsBin),
case Protocol:method_has_content(MethodName) of
true -> {ClassId, _MethodId} = Protocol:method_id(MethodName),
{ok, {content_header, Method, ClassId, Protocol}};
false -> {ok, Method, {method, Protocol}}
end
catch exit:#amqp_error{} = Reason -> {error, Reason}
end;
process(_Frame, {method, _Protocol}) ->
unexpected_frame("expected method frame, "
"got non method frame instead", [], none);
process({content_header, ClassId, 0, 0, PropertiesBin},
{content_header, Method, ClassId, Protocol}) ->
Content = empty_content(ClassId, PropertiesBin, Protocol),
{ok, Method, Content, {method, Protocol}};
process({content_header, ClassId, 0, BodySize, PropertiesBin},
{content_header, Method, ClassId, Protocol}) ->
Content = empty_content(ClassId, PropertiesBin, Protocol),
{ok, {content_body, Method, BodySize, Content, Protocol}};
process({content_header, HeaderClassId, 0, _BodySize, _PropertiesBin},
{content_header, Method, ClassId, _Protocol}) ->
unexpected_frame("expected content header for class ~w, "
"got one for class ~w instead",
[ClassId, HeaderClassId], Method);
process(_Frame, {content_header, Method, ClassId, _Protocol}) ->
unexpected_frame("expected content header for class ~w, "
"got non content header frame instead", [ClassId], Method);
process({content_body, FragmentBin},
{content_body, Method, RemainingSize,
Content = #content{payload_fragments_rev = Fragments}, Protocol}) ->
NewContent = Content#content{
payload_fragments_rev = [FragmentBin | Fragments]},
case RemainingSize - size(FragmentBin) of
0 -> {ok, Method, NewContent, {method, Protocol}};
Sz -> {ok, {content_body, Method, Sz, NewContent, Protocol}}
end;
process(_Frame, {content_body, Method, _RemainingSize, _Content, _Protocol}) ->
unexpected_frame("expected content body, "
"got non content body frame instead", [], Method).
%%--------------------------------------------------------------------
empty_content(ClassId, PropertiesBin, Protocol) ->
#content{class_id = ClassId,
properties = none,
properties_bin = PropertiesBin,
protocol = Protocol,
payload_fragments_rev = []}.
unexpected_frame(Format, Params, Method) when is_atom(Method) ->
{error, rabbit_misc:amqp_error(unexpected_frame, Format, Params, Method)};
unexpected_frame(Format, Params, Method) ->
unexpected_frame(Format, Params, rabbit_misc:method_record_type(Method)).