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
|
%% 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.
%%
%% We use a gen_server simply so that during the terminate/2 call
%% (i.e., during shutdown), we can sync/flush the dets table to disk.
-module(rabbit_recovery_terms).
-behaviour(gen_server).
-export([start/0, stop/0, store/2, read/1, clear/0]).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([upgrade_recovery_terms/0, persistent_bytes/0]).
-rabbit_upgrade({upgrade_recovery_terms, local, []}).
-rabbit_upgrade({persistent_bytes, local, [upgrade_recovery_terms]}).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(start() -> rabbit_types:ok_or_error(term())).
-spec(stop() -> rabbit_types:ok_or_error(term())).
-spec(store(file:filename(), term()) -> rabbit_types:ok_or_error(term())).
-spec(read(file:filename()) -> rabbit_types:ok_or_error2(term(), not_found)).
-spec(clear() -> 'ok').
-endif. % use_specs
%%----------------------------------------------------------------------------
-define(SERVER, ?MODULE).
start() -> rabbit_sup:start_child(?MODULE).
stop() -> rabbit_sup:stop_child(?MODULE).
store(DirBaseName, Terms) -> dets:insert(?MODULE, {DirBaseName, Terms}).
read(DirBaseName) ->
case dets:lookup(?MODULE, DirBaseName) of
[{_, Terms}] -> {ok, Terms};
_ -> {error, not_found}
end.
clear() ->
dets:delete_all_objects(?MODULE),
flush().
start_link() -> gen_server:start_link(?MODULE, [], []).
%%----------------------------------------------------------------------------
upgrade_recovery_terms() ->
open_table(),
try
QueuesDir = filename:join(rabbit_mnesia:dir(), "queues"),
Dirs = case rabbit_file:list_dir(QueuesDir) of
{ok, Entries} -> Entries;
{error, _} -> []
end,
[begin
File = filename:join([QueuesDir, Dir, "clean.dot"]),
case rabbit_file:read_term_file(File) of
{ok, Terms} -> ok = store(Dir, Terms);
{error, _} -> ok
end,
file:delete(File)
end || Dir <- Dirs],
ok
after
close_table()
end.
persistent_bytes() -> dets_upgrade(fun persistent_bytes/1).
persistent_bytes(Props) -> Props ++ [{persistent_bytes, 0}].
dets_upgrade(Fun)->
open_table(),
try
ok = dets:foldl(fun ({DirBaseName, Terms}, Acc) ->
store(DirBaseName, Fun(Terms)),
Acc
end, ok, ?MODULE),
ok
after
close_table()
end.
%%----------------------------------------------------------------------------
init(_) ->
process_flag(trap_exit, true),
open_table(),
{ok, undefined}.
handle_call(Msg, _, State) -> {stop, {unexpected_call, Msg}, State}.
handle_cast(Msg, State) -> {stop, {unexpected_cast, Msg}, State}.
handle_info(_Info, State) -> {noreply, State}.
terminate(_Reason, _State) ->
close_table().
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%----------------------------------------------------------------------------
open_table() ->
File = filename:join(rabbit_mnesia:dir(), "recovery.dets"),
{ok, _} = dets:open_file(?MODULE, [{file, File},
{ram_file, true},
{auto_save, infinity}]).
flush() -> dets:sync(?MODULE).
close_table() ->
ok = flush(),
ok = dets:close(?MODULE).
|
