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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) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_mnesia_rename).
-include("rabbit.hrl").
-export([rename/3]).
-export([maybe_finish/1]).
-define(CONVERT_TABLES, [schema, rabbit_durable_queue]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(rename/3 :: (node(), node(), [node()]) -> 'ok').
-spec(maybe_finish/1 :: ([node()]) -> 'ok').
-endif.
%%----------------------------------------------------------------------------
rename(FromNode, ToNode, Others) ->
NodeMap = dict:from_list(split_others([FromNode, ToNode | Others])),
try
rabbit_control_main:become(FromNode),
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(),
ok = mnesia:backup(FromBackup),
stop_mnesia(),
convert_backup(NodeMap, FromBackup, ToBackup),
ok = rabbit_file:write_term_file(rename_config_name(),
[{FromNode, ToNode}]),
convert_config_files(NodeMap),
ok
after
stop_mnesia()
end.
split_others([]) -> [];
split_others([_]) -> exit(even_list_needed);
split_others([A, B | T]) -> [{A, B} | split_others(T)].
maybe_finish(AllNodes) ->
case rabbit_file:read_term_file(rename_config_name()) of
{ok, [{FromNode, ToNode}]} -> finish(FromNode, ToNode, AllNodes);
_ -> ok
end.
finish(FromNode, ToNode, AllNodes) ->
case node() of
ToNode ->
case rabbit_upgrade:nodes_running(AllNodes) of
[] -> finish_primary(FromNode, ToNode);
_ -> finish_secondary(FromNode, ToNode, AllNodes)
end;
FromNode ->
rabbit_log:info(
"Abandoning rename from ~s to ~s since we are still ~s~n",
[FromNode, ToNode, FromNode]),
convert_config_files(mini_map(ToNode, FromNode)),
delete_rename_files();
_ ->
%% Boot will almost certainly fail but we might as
%% well just log this
rabbit_log:info(
"Rename attempted from ~s to ~s but we are ~s - ignoring.~n",
[FromNode, ToNode, node()])
end.
finish_primary(FromNode, ToNode) ->
rabbit_log:info("Restarting as primary after rename from ~s to ~s~n",
[FromNode, ToNode]),
%% We are alone, restore the backup we previously took
ToBackup = to_backup_name(),
ok = mnesia:install_fallback(ToBackup, [{scope, local}]),
start_mnesia(),
rabbit_table:force_load(),
rabbit_table:wait_for_replicated(),
stop_mnesia(),
delete_rename_files(),
rabbit_mnesia:force_load_next_boot(),
ok.
finish_secondary(FromNode, ToNode, AllNodes) ->
rabbit_log:info("Restarting as secondary after rename from ~s to ~s~n",
[FromNode, ToNode]),
rabbit_upgrade:secondary_upgrade(AllNodes),
rename_remote_node(FromNode, ToNode),
delete_rename_files(),
ok.
delete_rename_files() ->
rabbit_file:delete(rename_config_name()),
rabbit_file:delete(from_backup_name()),
rabbit_file:delete(to_backup_name()).
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) ->
mnesia:traverse_backup(
FromBackup, ToBackup,
fun
(Row, Acc) ->
case lists:member(element(1, Row), ?CONVERT_TABLES) of
true -> {[update_term(NodeMap, Row)], Acc};
false -> {[Row], Acc}
end
end, switched).
convert_config_files(NodeMap) ->
[convert_config_file(NodeMap, Path) ||
Path <- [rabbit_node_monitor:running_nodes_filename(),
rabbit_node_monitor:cluster_status_filename()]].
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.
mini_map(FromNode, ToNode) -> dict:from_list([{FromNode, ToNode}]).
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),
Map = mini_map(FromNode, ToNode),
{atomic, ok} = mnesia:transform_table(
rabbit_durable_queue, fun (Q) -> update_term(Map, Q) end,
record_info(fields, amqqueue)),
ok.
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