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
191
192
193
|
%% 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_mnesia_offline).
-include("rabbit.hrl").
-export([rename_local_node/3]).
-export([rename_remote_node/2]).
-export([maybe_complete_rename/1]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(rename_local_node/3 :: (node(), node(), [node()]) -> 'ok').
-spec(rename_remote_node/2 :: (node(), node()) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
rename_local_node(FromNode, ToNode, Others) ->
NodeMap = dict:from_list(split_others([FromNode, ToNode | Others])),
try
rabbit_control_main:become(FromNode),
rabbit_log:info("Renaming node ~s to ~s~n", [FromNode, ToNode]),
start_mnesia(),
Nodes = rabbit_mnesia:cluster_nodes(all),
case {lists:member(FromNode, Nodes), lists:member(ToNode, Nodes)} of
{true, false} -> ok;
{false, _} -> exit({node_not_in_cluster, FromNode});
{_, true} -> exit({node_already_in_cluster, ToNode})
end,
rabbit_table:force_load(),
rabbit_table:wait_for_replicated(),
FromBackup = from_backup_name(),
ToBackup = to_backup_name(),
io:format(" * Backing up to '~s'~n", [FromBackup]),
ok = mnesia:backup(FromBackup),
stop_mnesia(),
io:format(" * Converting backup '~s'~n", [ToBackup]),
convert_backup(NodeMap, FromBackup, ToBackup),
ok = rabbit_file:write_term_file(rename_config_name(),
[{FromNode, ToNode}]),
io:format(" * Converting config files~n", []),
convert_config_file(NodeMap,
rabbit_node_monitor:running_nodes_filename()),
convert_config_file(NodeMap,
rabbit_node_monitor:cluster_status_filename()),
ok
after
stop_mnesia()
end.
split_others([]) -> [];
split_others([_]) -> exit(even_list_needed);
split_others([A, B | T]) -> [{A, B} | split_others(T)].
maybe_complete_rename(AllNodes) ->
case rabbit_file:read_term_file(rename_config_name()) of
{ok, [{FromNode, ToNode}]} ->
case rabbit_upgrade:nodes_running(AllNodes) of
[] -> complete_rename_primary();
_ -> complete_rename_secondary(FromNode, ToNode, AllNodes)
end;
_ ->
ok
end.
complete_rename_primary() ->
%% We are alone, restore the backup we previously took
ToBackup = to_backup_name(),
io:format(" * Loading backup '~s'~n", [ToBackup]),
ok = mnesia:install_fallback(ToBackup, [{scope, local}]),
start_mnesia(),
stop_mnesia(),
rabbit_file:delete(rename_config_name()),
rabbit_file:delete(from_backup_name()),
rabbit_file:delete(to_backup_name()),
ok.
complete_rename_secondary(FromNode, ToNode, AllNodes) ->
rabbit_upgrade:secondary_upgrade(AllNodes),
[Another | _] = rabbit_mnesia:cluster_nodes(running) -- [node()],
ok = rpc:call(Another, ?MODULE, rename_remote_node,
[FromNode, ToNode]),
rabbit_file:delete(rename_config_name()),
rabbit_file:delete(from_backup_name()),
rabbit_file:delete(to_backup_name()),
ok.
from_backup_name() -> rabbit_mnesia:dir() ++ "/rename-backup-from".
to_backup_name() -> rabbit_mnesia:dir() ++ "/rename-backup-to".
rename_config_name() -> rabbit_mnesia:dir() ++ "/rename-pending.config".
start_mnesia() -> rabbit_misc:ensure_ok(mnesia:start(), cannot_start_mnesia).
stop_mnesia() -> stopped = mnesia:stop().
convert_backup(NodeMap, FromBackup, ToBackup) ->
Switch = fun (OldNode) ->
lookup_node(OldNode, NodeMap)
end,
Convert =
fun
%% TODO do we ever hit these three heads?
%% ({schema, db_nodes, Nodes}, Acc) ->
%% io:format(" +++ db_nodes ~p~n", [Nodes]),
%% {[{schema, db_nodes, lists:map(Switch,Nodes)}], Acc};
%% ({schema, version, Version}, Acc) ->
%% io:format(" +++ version: ~p~n", [Version]),
%% {[{schema, version, Version}], Acc};
%% ({schema, cookie, Cookie}, Acc) ->
%% io:format(" +++ cookie: ~p~n", [Cookie]),
%% {[{schema, cookie, Cookie}], Acc};
%% ({schema, Tab, CreateList}, Acc) ->
%% io:format("~n * Checking table: '~p'~n", [Tab]),
%% io:format(" . Initial content: ~p~n", [CreateList]),
%% Keys = [ram_copies, disc_copies, disc_only_copies],
%% OptSwitch =
%% fun({Key, Val}) ->
%% case lists:member(Key, Keys) of
%% true ->
%% %%io:format(" + Checking key: '~p'~n", [Key]),
%% {Key, lists:map(Switch, Val)};
%% false->
%% {Key, Val}
%% end
%% end,
%% Res = {[{schema, Tab, lists:map(OptSwitch, CreateList)}], Acc},
%% io:format(" . Resulting content: ~p~n", [Res]),
%% Res;
(Other, Acc) ->
case lists:member(element(1, Other), [schema, rabbit_durable_queue]) of
true -> Other1 = update_term(NodeMap, Other),
io:format(" --- ~p~n +++ ~p~n", [Other, Other1]),
{[Other1], Acc};
false -> {[Other], Acc}
end
end,
mnesia:traverse_backup(FromBackup, ToBackup, Convert, switched).
convert_config_file(NodeMap, Path) ->
{ok, Term} = rabbit_file:read_term_file(Path),
ok = rabbit_file:write_term_file(Path, update_term(NodeMap, Term)).
lookup_node(OldNode, NodeMap) ->
case dict:find(OldNode, NodeMap) of
{ok, NewNode} -> NewNode;
error -> OldNode
end.
update_term(NodeMap, L) when is_list(L) ->
[update_term(NodeMap, I) || I <- L];
update_term(NodeMap, T) when is_tuple(T) ->
list_to_tuple(update_term(NodeMap, tuple_to_list(T)));
update_term(NodeMap, Node) when is_atom(Node) ->
lookup_node(Node, NodeMap);
update_term(NodeMap, Pid) when is_pid(Pid) ->
rabbit_misc:pid_change_node(Pid, lookup_node(node(Pid), NodeMap));
update_term(_NodeMap, Term) ->
Term.
%%----------------------------------------------------------------------------
rename_remote_node(FromNode, ToNode) ->
All = rabbit_mnesia:cluster_nodes(all),
Running = rabbit_mnesia:cluster_nodes(running),
case {lists:member(FromNode, Running), lists:member(ToNode, All)} of
{false, true} -> ok;
{true, _} -> exit({old_node_running, FromNode});
{_, false} -> exit({new_node_not_in_cluster, ToNode})
end,
mnesia:del_table_copy(schema, FromNode),
NodeMap = dict:from_list([{FromNode, ToNode}]),
{atomic, ok} = mnesia:transform_table(
rabbit_durable_queue,
fun (Q) -> update_term(NodeMap, Q) end,
record_info(fields, amqqueue)),
ok.
|
