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s_group.erl
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s_group.erl
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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% 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.
%%
%% %CopyrightEnd%
%%
-module(s_group).
%% Groups nodes into s_groups with an own global name space.
-behaviour(gen_server).
%% External exports
-export([start/0, start_link/0, stop/0, init/1]).
-export([handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([s_groups/0]).
-export([monitor_nodes/1]).
-export([own_nodes/0]).
-export([registered_names/1]).
-export([send/2]).
-export([send/3]).
-export([whereis_name/1]).
-export([whereis_name/2]).
-export([sync/0]).
-export([ng_add_check/2, ng_add_check/3]).
-export([info/0]).
-export([registered_names_test/1]).
-export([send_test/2]).
-export([whereis_name_test/1]).
-export([get_own_nodes/0, get_own_nodes_with_errors/0,
get_own_s_groups_with_nodes/0]).
-export([publish_on_nodes/0]).
-export([config_scan/1, config_scan/2]).
-export([new_s_group/2, remove_s_group/1,
s_group_add_nodes/2,
s_group_remove_nodes/2,
new_s_group_check/3,
remove_s_group_check/1,
s_group_add_nodes_check/3,
s_group_remove_nodes_check/2]).
%% Internal exports
-export([sync_init/4]).
-define(cc_vsn, 2).
-define(debug(_), ok).
%%-define(debug(T), erlang:display({node(), {line,?LINE}, T})).
%%%====================================================================================
-type publish_type() :: 'hidden' | 'normal'.
-type sync_state() :: 'no_conf' | 'synced'.
-type group_name() :: atom().
-type group_tuple() :: {GroupName :: group_name(), [node()]}
| {GroupName :: group_name(),
PublishType :: publish_type(),
[node()]}.
%%%====================================================================================
%%% The state of the s_group process
%%%
%%% sync_state = no_conf (s_groups not defined, inital state) |
%%% synced
%%% group_name = Own global group name
%%% nodes = Nodes in the own global group
%%% no_contact = Nodes which we haven't had contact with yet
%%% sync_error = Nodes which we haven't had contact with yet
%%% other_grps = list of other global group names and nodes, [{otherName, [Node]}]
%%% node_name = Own node
%%% monitor = List of Pids requesting nodeup/nodedown
%%%====================================================================================
-record(state, {sync_state = no_conf :: sync_state(),
connect_all :: boolean(),
group_names = [] :: [group_name()], %% type changed by HL;
nodes = [] :: [node()],
no_contact = [] :: [node()],
sync_error = [] :: [node()],
other_grps = [] :: [{group_name(), [node()]}],
own_grps =[] :: [{group_name(), [node()]}], %% added by HL;
node_name = node() :: node(),
monitor = [] :: [pid()],
publish_type = normal :: publish_type(), %% node default pubtype is normal
group_publish_type = hidden :: publish_type()}). %% all s_groups are hidden?
%%%====================================================================================
%%% External exported
%%%====================================================================================
-spec s_groups() -> {GroupName, GroupNames} | undefined when
GroupName ::[group_name()], GroupNames :: [GroupName].
s_groups() ->
request(s_groups).
-spec monitor_nodes(Flag) -> 'ok' when
Flag :: boolean().
monitor_nodes(Flag) ->
case Flag of
true -> request({monitor_nodes, Flag});
false -> request({monitor_nodes, Flag});
_ -> {error, not_boolean}
end.
-spec own_nodes() -> Nodes when
Nodes :: [Node :: node()].
own_nodes() ->
request(own_nodes).
-type name() :: atom().
-type where() :: {'node', node()} | {'group', group_name()}.
-spec registered_names(Where) -> Names when
Where :: where(),
Names :: [Name :: name()].
registered_names(Arg) ->
request({registered_names, Arg}).
-spec send(Name, Msg) -> pid() | {'badarg', {Name, Msg}} when
Name :: name(),
Msg :: term().
send(Name, Msg) ->
request({send, Name, Msg}).
-spec send(Where, Name, Msg) -> pid() | {'badarg', {Name, Msg}} when
Where :: where(),
Name :: name(),
Msg :: term().
send(Group, Name, Msg) ->
request({send, Group, Name, Msg}).
-spec whereis_name(Name) -> pid() | 'undefined' when
Name :: name().
whereis_name(Name) ->
request({whereis_name, Name}).
-spec whereis_name(Where, Name) -> pid() | 'undefined' when
Where :: where(),
Name :: name().
whereis_name(Group, Name) ->
request({whereis_name, Group, Name}).
-spec sync() -> 'ok'.
sync() ->
request(sync).
ng_add_check(Node, OthersNG) ->
ng_add_check(Node, normal, OthersNG).
ng_add_check(Node, PubType, OthersNG) ->
request({ng_add_check, Node, PubType, OthersNG}).
-type info_item() :: {'state', State :: sync_state()}
| {'own_group_names', GroupName :: [group_name()]}
| {'own_group_nodes', Nodes :: [node()]}
| {'synched_nodes', Nodes :: [node()]}
| {'sync_error', Nodes :: [node()]}
| {'no_contact', Nodes :: [node()]}
| {'own_groups', OwnGroups::[group_tuple()]}
| {'other_groups', Groups :: [group_tuple()]}
| {'monitoring', Pids :: [pid()]}
| {'publish_type', PubType:: publish_type()}
| {'group_publish__type', PubType:: publish_type()}.
-spec info() -> [info_item()].
info() ->
request(info, 3000).
-spec new_s_group(GroupName::group_name(), Nodes::[node()]) ->
ok|{error, Reason::term()}.
new_s_group(GroupName, Nodes) ->
case request({new_s_group, GroupName, Nodes}) of
ok ->
ok=request({new_s_group_1, GroupName, Nodes}),
timer:sleep(1000),
sync();
{error, Reason} ->
Reason
end.
new_s_group_check(Node, PubType, {GroupName, Nodes}) ->
request({new_s_group_check, Node, PubType, {GroupName, Nodes}}).
-spec remove_s_group(GroupName::group_name()) -> ok | {error, Reason::term()}.
remove_s_group(GroupName) ->
request({remove_s_group, GroupName}).
remove_s_group_check(GroupName) ->
request({remove_s_group_check, GroupName}).
-spec s_group_add_nodes(GroupName::group_name(), Nodes::[node()]) ->
{ok, [node()]} | {error, Reason::term()}.
s_group_add_nodes(GroupName, Nodes) ->
request({s_group_add_nodes, GroupName, Nodes}).
s_group_add_nodes_check(Node, PubType, {GroupName, Nodes}) ->
request({s_group_add_nodes_check, Node, PubType, {GroupName, Nodes}}).
-spec s_group_remove_nodes(GroupName::[group_name()], Nodes::[node()]) ->
ok | {error, Reason::term()}.
s_group_remove_nodes(GroupName, Nodes) ->
request({s_group_remove_nodes, GroupName, Nodes}).
s_group_remove_nodes_check(GroupName, Nodes) ->
request({s_group_remove_nodes_check, GroupName, Nodes}).
%% ==== ONLY for test suites ====
registered_names_test(Arg) ->
request({registered_names_test, Arg}).
send_test(Name, Msg) ->
request({send_test, Name, Msg}).
whereis_name_test(Name) ->
request({whereis_name_test, Name}).
%% ==== ONLY for test suites ====
request(Req) ->
request(Req, infinity).
request(Req, Time) ->
case whereis(s_group) of
P when is_pid(P) ->
gen_server:call(s_group, Req, Time);
_Other ->
{error, s_group_not_runnig}
end.
%%%====================================================================================
%%% gen_server start
%%%
%%% The first thing to happen is to read if the s_groups key is defined in the
%%% .config file. If not defined, the whole system is started as one s_group,
%%% and the services of s_group are superfluous.
%%% Otherwise a sync process is started to check that all nodes in the own global
%%% group have the same configuration. This is done by sending 'conf_check' to all
%%% other nodes and requiring 'conf_check_result' back.
%%% If the nodes are not in agreement of the configuration the s_group process
%%% will remove these nodes from the #state.nodes list. This can be a normal case
%%% at release upgrade when all nodes are not yet upgraded.
%%%
%%% It is possible to manually force a sync of the s_group. This is done for
%%% instance after a release upgrade, after all nodes in the group beeing upgraded.
%%% The nodes are not synced automatically because it would cause the node to be
%%% disconnected from those not yet beeing upgraded.
%%%
%%% The three process dictionary variables (registered_names, send, and whereis_name)
%%% are used to store information needed if the search process crashes.
%%% The search process is a help process to find registered names in the system.
%%%====================================================================================
start() -> gen_server:start({local, s_group}, s_group, [], []).
start_link() -> gen_server:start_link({local, s_group},s_group,[],[]).
stop() -> gen_server:call(s_group, stop, infinity).
init([]) ->
process_flag(priority, max),
ok = net_kernel:monitor_nodes(true),
put(registered_names, [undefined]),
put(send, [undefined]),
put(whereis_name, [undefined]),
process_flag(trap_exit, true),
Ca = case init:get_argument(connect_all) of
{ok, [["false"]]} ->
false;
_ ->
true
end,
PT = publish_arg(),
case application:get_env(kernel, s_groups) of
undefined ->
update_publish_nodes(PT),
{ok, #state{publish_type = PT,
connect_all = Ca}};
{ok, []} ->
update_publish_nodes(PT),
{ok, #state{publish_type = PT,
connect_all = Ca}};
{ok, NodeGrps} ->
case catch config_scan(NodeGrps, publish_type) of
{error, _Error2} ->
update_publish_nodes(PT),
exit({error, {'invalid g_groups definition', NodeGrps}});
{ok, DefOwnSGroupsT, DefOtherSGroupsT} ->
?debug({".config file scan result:", {ok, DefOwnSGroupsT, DefOtherSGroupsT}}),
DefOwnSGroupsT1 = [{GroupName,GroupNodes}||
{GroupName, _PubType, GroupNodes}
<- DefOwnSGroupsT],
{DefSGroupNamesT1, DefSGroupNodesT1}=lists:unzip(DefOwnSGroupsT1),
DefSGroupNamesT = lists:usort(DefSGroupNamesT1),
DefSGroupNodesT = lists:usort(lists:append(DefSGroupNodesT1)),
update_publish_nodes(PT, {hidden, DefSGroupNodesT}),
%% First disconnect any nodes not belonging to our own group
disconnect_nodes(nodes(connected) -- DefSGroupNodesT),
lists:foreach(fun(Node) ->
erlang:monitor_node(Node, true)
end,
DefSGroupNodesT),
NewState = #state{publish_type = PT,
sync_state = synced,
group_names = DefSGroupNamesT,
no_contact = lists:delete(node(), DefSGroupNodesT),
own_grps = DefOwnSGroupsT1,
other_grps = DefOtherSGroupsT},
?debug({"NewState", NewState}),
{ok, NewState}
end
end.
%%%====================================================================================
%%% sync() -> ok
%%%
%%% An operator ordered sync of the own global group. This must be done after
%%% a release upgrade. It can also be ordered if somthing has made the nodes
%%% to disagree of the s_groups definition.
%%%====================================================================================
handle_call(sync, _From, S) ->
?debug({"sync:",[node(), application:get_env(kernel, s_groups)]}),
case application:get_env(kernel, s_groups) of
undefined ->
update_publish_nodes(S#state.publish_type),
{reply, ok, S};
{ok, []} ->
update_publish_nodes(S#state.publish_type),
{reply, ok, S};
{ok, NodeGrps} ->
{DefGroupNames, PubTpGrp, DefNodes, DefOwn, DefOther} =
case catch config_scan(NodeGrps, publish_type) of
{error, _Error2} ->
exit({error, {'invalid s_groups definition', NodeGrps}});
{ok, DefOwnSGroupsT, DefOtherSGroupsT} ->
?debug({"sync:", {ok, DefOwnSGroupsT, DefOtherSGroupsT}}),
DefOwnSGroupsT1 = [{GroupName,GroupNodes}||
{GroupName, _PubType, GroupNodes}
<- DefOwnSGroupsT],
{DefSGroupNamesT1, DefSGroupNodesT1}=lists:unzip(DefOwnSGroupsT1),
DefSGroupNamesT = lists:usort(DefSGroupNamesT1),
DefSGroupNodesT = lists:usort(lists:append(DefSGroupNodesT1)),
?debug({"sync1:", DefSGroupNamesT, DefSGroupNodesT}),
update_publish_nodes(S#state.publish_type, {hidden, DefSGroupNodesT}),
%% First inform global on all nodes not belonging to our own group
NoGroupNodes = nodes(connected) -- DefSGroupNodesT,
?debug({"remove_from_no_group", node(), NoGroupNodes}),
[rpc:call(N, global, remove_from_no_group, [node()])
|| N <-NoGroupNodes],
%% disconnect_nodes(nodes(connected) -- DefSGroupNodesT), %%HL: is this needed?
%% Sync with the nodes in the own group
kill_s_group_check(),
Pid = spawn_link(?MODULE, sync_init,
[sync, DefSGroupNamesT, PubType, DefOwnSGroupsT1]),
register(s_group_check, Pid),
{DefSGroupNamesT, PubType,
lists:delete(node(), DefSGroupNodesT),
DefOwnSGroupsT1, DefOtherSGroupsT}
end,
{reply, ok, S#state{sync_state = synced, group_names = DefGroupNames,
no_contact = lists:sort(DefNodes),
own_grps = DefOwn,
other_grps = DefOther, group_publish_type = PubTpGrp}}
end;
%%%====================================================================================
%%% Get the names of the s_groups
%%%====================================================================================
handle_call(s_groups, _From, S) ->
Result = case S#state.sync_state of
no_conf ->
undefined;
synced ->
Other = lists:foldl(fun({N,_L}, Acc) -> Acc ++ [N]
end,
[], S#state.other_grps),
{S#state.group_names, Other}
end,
{reply, Result, S};
%%%====================================================================================
%%% monitor_nodes(bool()) -> ok
%%%
%%% Monitor nodes in the own global group.
%%% True => send nodeup/nodedown to the requesting Pid
%%% False => stop sending nodeup/nodedown to the requesting Pid
%%%====================================================================================
handle_call({monitor_nodes, Flag}, {Pid, _}, StateIn) ->
%%io:format("***** handle_call ~p~n",[monitor_nodes]),
{Res, State} = monitor_nodes(Flag, Pid, StateIn),
{reply, Res, State};
%%%====================================================================================
%%% own_nodes() -> [Node]
%%%
%%% Get a list of nodes in the own global group
%%%====================================================================================
handle_call(own_nodes, _From, S) ->
Nodes = case S#state.sync_state of
no_conf ->
[node() | nodes()];
synced ->
get_own_nodes()
% S#state.nodes
end,
{reply, Nodes, S};
%%%====================================================================================
%%% registered_names({node, Node}) -> [Name] | {error, ErrorMessage}
%%% registered_names({group, GlobalGroupName}) -> [Name] | {error, ErrorMessage}
%%%
%%% Get the registered names from a specified Node, or GlobalGroupName.
%%%====================================================================================
handle_call({registered_names, {group, Group}}, From, S) ->
case lists:member(Group, S#state.group_names) of
true ->
Res = global:registered_names(),
{reply, Res, S};
false ->
case lists:keysearch(Group, 1, S#state.other_grps) of
false ->
{reply, [], S};
{value, {Group, []}} ->
{reply, [], S};
{value, {Group, Nodes}} ->
Pid = global_search:start(names, {group, Nodes, From}),
Wait = get(registered_names),
put(registered_names, [{Pid, From} | Wait]),
{noreply, S}
end
end;
handle_call({registered_names, {node, Node}}, _From, S) when Node =:= node() ->
Res = global:registered_names(),
{reply, Res, S};
handle_call({registered_names, {node, Node}}, From, S) ->
Pid = global_search:start(names, {node, Node, From}),
%%io:format(">>>>> registered_names Pid ~p~n",[Pid]),
Wait = get(registered_names),
put(registered_names, [{Pid, From} | Wait]),
{noreply, S};
%%%====================================================================================
%%% send(Name, Msg) -> Pid | {badarg, {Name, Msg}}
%%% send({node, Node}, Name, Msg) -> Pid | {badarg, {Name, Msg}}
%%% send({group, GlobalGroupName}, Name, Msg) -> Pid | {badarg, {Name, Msg}}
%%%
%%% Send the Msg to the specified globally registered Name in own global group,
%%% in specified Node, or GlobalGroupName.
%%% But first the receiver is to be found, the thread is continued at
%%% handle_cast(send_res)
%%%====================================================================================
%% Search in the whole known world, but check own node first.
handle_call({send, Name, Msg}, From, S) ->
case global:whereis_name(Name) of
undefined ->
Pid = global_search:start(send, {any, S#state.other_grps, Name, Msg, From}),
Wait = get(send),
put(send, [{Pid, From, Name, Msg} | Wait]),
{noreply, S};
Found ->
Found ! Msg,
{reply, Found, S}
end;
%% Search in the specified global group, which happens to be the own group.
handle_call({send, {group, Grp}, Name, Msg}, From, S) ->
case lists:member(Grp, S#state.group_names) of
true ->
case global:whereis_name(Name) of
undefined ->
{reply, {badarg, {Name, Msg}}, S};
Pid ->
Pid ! Msg,
{reply, Pid, S}
end;
false ->
case lists:keysearch(Grp, 1, S#state.other_grps) of
false ->
{reply, {badarg, {Name, Msg}}, S};
{value, {Grp, []}} ->
{reply, {badarg, {Name, Msg}}, S};
{value, {Grp, Nodes}} ->
Pid = global_search:start(send, {group, Nodes, Name, Msg, From}),
Wait = get(send),
put(send, [{Pid, From, Name, Msg} | Wait]),
{noreply, S}
end
end;
%% Search on the specified node.
handle_call({send, {node, Node}, Name, Msg}, From, S) ->
Pid = global_search:start(send, {node, Node, Name, Msg, From}),
Wait = get(send),
put(send, [{Pid, From, Name, Msg} | Wait]),
{noreply, S};
%%%====================================================================================
%%% whereis_name(Name) -> Pid | undefined
%%% whereis_name({node, Node}, Name) -> Pid | undefined
%%% whereis_name({group, GlobalGroupName}, Name) -> Pid | undefined
%%%
%%% Get the Pid of a globally registered Name in own global group,
%%% in specified Node, or GlobalGroupName.
%%% But first the process is to be found,
%%% the thread is continued at handle_cast(find_name_res)
%%%====================================================================================
%% Search in the whole known world, but check own node first.
handle_call({whereis_name, Name}, From, S) ->
case global:whereis_name(Name) of
undefined ->
Pid = global_search:start(whereis, {any, S#state.other_grps, Name, From}),
Wait = get(whereis_name),
put(whereis_name, [{Pid, From} | Wait]),
{noreply, S};
Found ->
{reply, Found, S}
end;
%% Search in the specified global group, which happens to be the own group.
% Need to change!! HL.
handle_call({whereis_name, {group, Group}, Name}, From, S) ->
case lists:member(Group, S#state.group_names) of
true ->
Res = global:whereis_name(Name),
{reply, Res, S};
false ->
case lists:keysearch(Group, 1, S#state.other_grps) of
false ->
{reply, undefined, S};
{value, {Group, []}} ->
{reply, undefined, S};
{value, {Group, Nodes}} ->
Pid = global_search:start(whereis, {group, Nodes, Name, From}),
Wait = get(whereis_name),
put(whereis_name, [{Pid, From} | Wait]),
{noreply, S}
end
end;
%% Search on the specified node.
handle_call({whereis_name, {node, Node}, Name}, From, S) ->
Pid = global_search:start(whereis, {node, Node, Name, From}),
Wait = get(whereis_name),
put(whereis_name, [{Pid, From} | Wait]),
{noreply, S};
%%%====================================================================================
%%% s_groups parameter added to some other node which thinks that we
%%% belong to the same global group.
%%% It could happen that our node is not yet updated with the new node_group parameter
%%%====================================================================================
handle_call({ng_add_check, Node, PubType, OthersNG}, _From, S) ->
%% Check which nodes are already updated
OwnNG = get_own_nodes(),
case S#state.group_publish_type =:= PubType of
true ->
case OwnNG of
OthersNG ->
NN = [Node | S#state.nodes],
NSE = lists:delete(Node, S#state.sync_error),
NNC = lists:delete(Node, S#state.no_contact),
NewS = S#state{nodes = lists:sort(NN),
sync_error = NSE,
no_contact = NNC},
{reply, agreed, NewS};
_ ->
{reply, not_agreed, S}
end;
_ ->
{reply, not_agreed, S}
end;
%%%====================================================================================
%%% Misceleaneous help function to read some variables
%%%====================================================================================
handle_call(info, _From, S) ->
Reply = [{state, S#state.sync_state},
{own_group_names, S#state.group_names},
{own_group_nodes, lists:usort(lists:append(element(2,lists:unzip(S#state.own_grps))))},
%% {own_group_nodes, get_own_nodes()},
%{"nodes()", lists:sort(nodes())},
{synced_nodes, S#state.nodes},
{sync_error, S#state.sync_error},
{no_contact, S#state.no_contact},
{own_groups, S#state.own_grps},
{other_groups, S#state.other_grps},
{publish_type, S#state.publish_type},
{group_publish_type, S#state.group_publish_type},
{monitoring, S#state.monitor}],
{reply, Reply, S};
handle_call(get, _From, S) ->
{reply, get(), S};
%%%====================================================================================
%%% Only for test suites. These tests when the search process exits.
%%%====================================================================================
handle_call({registered_names_test, {node, 'test3844zty'}}, From, S) ->
Pid = global_search:start(names_test, {node, 'test3844zty'}),
Wait = get(registered_names),
put(registered_names, [{Pid, From} | Wait]),
{noreply, S};
handle_call({registered_names_test, {node, _Node}}, _From, S) ->
{reply, {error, illegal_function_call}, S};
handle_call({send_test, Name, 'test3844zty'}, From, S) ->
Pid = global_search:start(send_test, 'test3844zty'),
Wait = get(send),
put(send, [{Pid, From, Name, 'test3844zty'} | Wait]),
{noreply, S};
handle_call({send_test, _Name, _Msg }, _From, S) ->
{reply, {error, illegal_function_call}, S};
handle_call({whereis_name_test, 'test3844zty'}, From, S) ->
Pid = global_search:start(whereis_test, 'test3844zty'),
Wait = get(whereis_name),
put(whereis_name, [{Pid, From} | Wait]),
{noreply, S};
handle_call({whereis_name_test, _Name}, _From, S) ->
{reply, {error, illegal_function_call}, S};
%%%====================================================================================
%%% Create a new s_group.
%%% -spec new_s_group(GroupName::group_name(), Nodes::[node()]) ->
%%% ok|{error, Reason::term()}.
%%%====================================================================================
handle_call({new_s_group, GroupName, Nodes}, _From, S) ->
?debug({new_s_group, GroupName, Nodes}),
OtherNodes = lists:delete(node(), Nodes),
OwnKnownSgroupNames = S#state.group_names,
OthersKnownSgroupNames = known_s_group_names(OtherNodes),
KnownSgroupNames=OwnKnownSgroupNames ++ OthersKnownSgroupNames,
?debug({"KnownSGroupNames:",KnownSgroupNames}),
case lists:member(GroupName, KnownSgroupNames) of
true ->
{reply, {error, s_group_name_in_use}, S};
false ->
{reply, ok, S}
end;
handle_call({new_s_group_1, GroupName, Nodes}, _From, S) ->
?debug({new_s_group, GroupName, Nodes}),
OtherNodes = lists:delete(node(), Nodes),
?debug({conntect, nodes(connected)}),
NewConf=mk_new_s_group_conf(GroupName, Nodes),
application:set_env(kernel, s_groups, NewConf),
NGACArgs = [node(), hidden, {GroupName, Nodes}],
{_NS, _NNC, _NSE} =
lists:foldl(fun(Node, {NN_acc, NNC_acc, NSE_acc}) ->
case rpc:call(Node, s_group, new_s_group_check, NGACArgs) of
{badrpc, _} ->
{NN_acc, [Node | NNC_acc], NSE_acc};
agreed ->
{[Node | NN_acc], NNC_acc, NSE_acc};
not_agreed ->
{NN_acc, NNC_acc, [Node | NSE_acc]}
end
end,
{[], [], []}, OtherNodes),
NewS= S#state{sync_state = synced,
group_names = [GroupName|S#state.group_names],
sync_error = Nodes ++ S#state.sync_error,
no_contact= Nodes ++ S#state.no_contact,
own_grps = [{GroupName,Nodes}|S#state.own_grps]},
{reply, ok, NewS};
handle_call({new_s_group_check, Node, PubType, {GroupName, Nodes}}, _From, S) ->
?debug({{new_s_group_check, Node, PubType, {GroupName, Nodes}}, _From, S}),
NewConf=mk_new_s_group_conf(GroupName, Nodes),
application:set_env(kernel, s_groups, NewConf),
PT = publish_arg(),
update_publish_nodes(PT, {PubType, Nodes}), .
OtherNodes = Nodes -- [node()],
GroupNodes = Nodes++lists:append(element(2,lists:unzip(S#state.own_grps))),
NoGroupNodes = nodes(connected) -- GroupNodes,
?debug({"remove_from_no_group", node(), NoGroupNodes}),
[rpc:call(N, global, remove_from_no_group, [node()])
|| N <-NoGroupNodes],
NewS= S#state{sync_state = synced,
group_names = [GroupName|S#state.group_names],
sync_error = OtherNodes ++ S#state.sync_error,
no_contact= OtherNodes ++ S#state.no_contact,
own_grps = [{GroupName,Nodes}|S#state.own_grps]},
{reply, agreed, NewS};
%%%====================================================================================
%%% Remove a s_group.
%%% -spec remove_s_group(GroupName::group_name()) -> ok | {error, Reason::term()}.
%%%====================================================================================
handle_call({remove_s_group, GroupName}, _From, S) ->
?debug({remove_s_group, GroupName}),
case lists:member(GroupName, S#state.group_names) of
false ->
{reply, ok, S};
true ->
global:remove_s_group(GroupName),
NewConf=rm_s_group_from_conf(GroupName),
application:set_env(kernel, s_groups, NewConf),
GroupNodes = case lists:keyfind(GroupName, 1, S#state.own_grps) of
{_, Ns}-> Ns;
false -> [] %% this should not happen.
end,
OtherGroupNodes = lists:usort(lists:append(
[Ns||{G, Ns}<-S#state.own_grps,G/=GroupName])),
OtherNodes = lists:delete(node(), GroupNodes),
[rpc:call(Node, s_group, remove_s_group_check, [GroupName])||
Node<-OtherNodes],
NewS = S#state{sync_state = if length(S#state.group_names)==1 -> no_conf;
true -> synced
end,
group_names = S#state.group_names -- [GroupName],
nodes = S#state.nodes -- (GroupNodes--OtherGroupNodes),
sync_error = S#state.sync_error--GroupNodes,
no_contact = S#state.no_contact--GroupNodes,
own_grps = S#state.own_grps -- [{GroupName, GroupNodes}]
},
{reply, ok, NewS}
end;
handle_call({remove_s_group_check, GroupName}, _From, S) ->
?debug({remove_s_group_check, GroupName}),
global:remove_s_group(GroupName),
NewConf=rm_s_group_from_conf(GroupName),
application:set_env(kernel, s_groups, NewConf),
GroupNodes = case lists:keyfind(GroupName, 1, S#state.own_grps) of
{_, Ns}-> Ns;
false -> [] %% this should not happen.
end,
OtherGroupNodes = lists:usort(lists:append(
[Ns||{G, Ns}<-S#state.own_grps,G/=GroupName])),
NewS = S#state{sync_state = if length(S#state.group_names)==1 -> no_conf;
true -> synced
end,
group_names = S#state.group_names -- [GroupName],
nodes = S#state.nodes -- (GroupNodes--OtherGroupNodes),
sync_error = S#state.sync_error--GroupNodes,
no_contact = S#state.no_contact--GroupNodes,
own_grps = S#state.own_grps -- [{GroupName, GroupNodes}]
},
{reply, ok, NewS};
%%%====================================================================================
%%% %%% -spec s_group_remove_nodes(GroupName::[group_name()], Nodes::[node()]) ->
%%% ok | {error, Reason::term()}.
%%%====================================================================================
handle_call({s_group_remove_nodes, GroupName, Nodes}, _From, S) ->
?debug({s_group_remove_nodes, GroupName, Nodes}),
case lists:member(GroupName, S#state.group_names) of
false ->
{reply, {error, s_group_name_does_not_exist}, S};
true ->
GroupNodes = case lists:keyfind(GroupName, 1, S#state.own_grps) of
{_, Ns}-> Ns;
false -> [] %% this should not happen.
end,
OtherNodes = GroupNodes -- [node()],
NodesToRm = intersection(Nodes, GroupNodes),
NewConf = rm_s_group_nodes_from_conf(GroupName,NodesToRm),
application:set_env(kernel, s_groups, NewConf),
global:remove_s_group_nodes(GroupName, NodesToRm),
[rpc:call(Node, s_group, s_group_remove_nodes_check, [GroupName, NodesToRm])||
Node<-OtherNodes],
NewS=case lists:member(node(), NodesToRm) orelse NodesToRm==GroupNodes of
true ->
NewOwnGrps = [Ns||{G, Ns}<-S#state.own_grps, G/=GroupName],
NewNodes = lists:append(element(2,lists:unzip(NewOwnGrps))),
S#state{sync_state = if length(S#state.group_names)==1 -> no_conf;
true -> synced
end,
group_names = S#state.group_names -- [GroupName],
nodes = NewNodes,
sync_error = S#state.sync_error--GroupNodes,
no_contact = S#state.no_contact--GroupNodes,
own_grps = NewOwnGrps
};
false->
NewGroupNodes = GroupNodes -- NodesToRm,
NewOwnGrps = lists:keyreplace(GroupName,1, S#state.own_grps,
{GroupName, NewGroupNodes}),
NewNodes = lists:append(element(2,lists:unzip(NewOwnGrps))),
S#state{nodes = NewNodes,
sync_error = S#state.sync_error--NodesToRm,
no_contact = S#state.no_contact--NodesToRm,
own_grps = NewOwnGrps}
end,
{reply, ok, NewS}
end;
handle_call({s_group_remove_nodes_check, GroupName, NodesToRm}, _From, S) ->
?debug({{s_group_remove_nodes_check, GroupName, NodesToRm}, _From, S}),
NewConf = rm_s_group_nodes_from_conf(GroupName,NodesToRm),
application:set_env(kernel, s_groups, NewConf),
global:remove_s_group_nodes(GroupName, NodesToRm),
GroupNodes = case lists:keyfind(GroupName, 1, S#state.own_grps) of
{_, Ns}-> Ns;
false -> [] %% this should not happen.
end,
NewS=case lists:member(node(), NodesToRm) orelse NodesToRm==GroupNodes of
true ->
NewOwnGrps = [Ns||{G, Ns}<-S#state.own_grps, G/=GroupName],
NewNodes = lists:append(element(2,lists:unzip(NewOwnGrps))),
S#state{sync_state = if length(S#state.group_names)==1 -> no_conf;
true -> synced
end,
group_names = S#state.group_names -- [GroupName],
nodes = NewNodes,
sync_error = S#state.sync_error--GroupNodes,
no_contact = S#state.no_contact--GroupNodes,
own_grps = NewOwnGrps
};
false->
NewGroupNodes = GroupNodes -- NodesToRm,
NewOwnGrps = lists:keyreplace(GroupName,1, S#state.own_grps,
{GroupName, NewGroupNodes}),
NewNodes = lists:append(element(2,lists:unzip(NewOwnGrps))),
S#state{nodes = NewNodes,
sync_error = S#state.sync_error--NodesToRm,
no_contact = S#state.no_contact--NodesToRm,
own_grps = NewOwnGrps}
end,
{reply, ok, NewS};
%%%====================================================================================
%%% remove nodes from an existing s_group.
%%%-spec s_group_add_nodes(GroupName::group_name(), Nodes::[node()]) ->
%%% ok | {error, Reason::term()}.
%%%====================================================================================
handle_call({s_group_add_nodes, GroupName, Nodes}, _From, S) ->
?debug({s_group_add_nodes, GroupName, Nodes}),
case lists:member(GroupName, S#state.group_names) of
false ->
{reply, {error, s_group_name_does_not_exist}, S};
true ->
GroupNodes = case lists:keyfind(GroupName, 1, S#state.own_grps) of
{_, Ns}-> Ns;
false -> [] %% this should not happen.
end,
case Nodes -- GroupNodes of
[] -> {reply, ok, S};
NewNodes ->
ok=global:set_s_group_name(GroupName),
NodesToDisConnect =nodes(connected) -- (Nodes++S#state.nodes),
force_nodedown(NodesToDisConnect),
NewGroupNodes=lists:sort(NewNodes++GroupNodes),
NewConf=mk_new_s_group_conf(GroupName, NewGroupNodes),
?debug({"Newconf:", NewConf}),
application:set_env(kernel, s_groups, NewConf),
NewGroupNodes=lists:sort(NewNodes++GroupNodes),
NGACArgs = [node(), normal, {GroupName, NewGroupNodes}],
?debug({"NGACArgs:",NGACArgs}),
{NS, NNC, NSE} =
lists:foldl(fun(Node, {NN_acc, NNC_acc, NSE_acc}) ->
case rpc:call(Node, s_group, s_group_add_nodes_check, NGACArgs) of
{badrpc, _} ->
{NN_acc, [Node | NNC_acc], NSE_acc};
agreed ->
{[Node | NN_acc], NNC_acc, NSE_acc};
not_agreed ->
{NN_acc, NNC_acc, [Node | NSE_acc]}
end
end,
{[], [], []}, lists:delete(node(), NewGroupNodes)),
?debug({"NS_NNC_NSE1:", {NS, NNC, NSE}}),
ok = global:reset_s_group_name(),
NewS = S#state{sync_state = synced,
nodes = lists:usort(NewNodes++S#state.nodes),
sync_error = lists:usort(NSE++S#state.sync_error--NS),
no_contact = lists:usort(NNC++S#state.no_contact--NS),
own_grps = lists:keyreplace(GroupName,1, S#state.own_grps,
{GroupName, NewGroupNodes})
},
{reply, ok, NewS}
end
end;
handle_call({s_group_add_nodes_check, Node, _PubType, {GroupName, Nodes}}, _From, S) ->
?debug({{s_group_add_nodes_check, Node, _PubType, {GroupName, Nodes}}, _From, S}),
NewConf=mk_new_s_group_conf(GroupName, Nodes),
application:set_env(kernel, s_groups, NewConf),
NewGroupNames = case lists:member(GroupName, S#state.group_names) of
true->S#state.group_names;
false-> lists:sort([GroupName|S#state.group_names])
end,
NewOwnGroups = case lists:keyfind(GroupName, 1, S#state.own_grps) of
false -> [{GroupName, Nodes}];
_-> lists:keyreplace(GroupName, 1,
S#state.own_grps,
{GroupName, Nodes})
end,
NewS= S#state{sync_state = synced,
group_names = NewGroupNames,
nodes = lists:usort(S#state.nodes++Nodes),
sync_error = lists:delete(Node, S#state.sync_error),
no_contact=lists:delete(Node, S#state.no_contact),
own_grps = NewOwnGroups},
{reply, agreed, NewS};
%%%====================================================================================
handle_call(Call, _From, S) ->
%%io:format("***** handle_call ~p~n",[Call]),
{reply, {illegal_message, Call}, S}.
%%%====================================================================================
%%% registered_names({node, Node}) -> [Name] | {error, ErrorMessage}
%%% registered_names({group, GlobalGroupName}) -> [Name] | {error, ErrorMessage}
%%%
%%% Get a list of nodes in the own global group
%%%====================================================================================
handle_cast({registered_names, User}, S) ->
%%%io:format(">>>>> registered_names User ~p~n",[User]),
Res = global:registered_names(),
User ! {registered_names_res, Res},
{noreply, S};
handle_cast({registered_names_res, Result, Pid, From}, S) ->
%%%io:format(">>>>> registered_names_res Result ~p~n",[Result]),
unlink(Pid),
exit(Pid, normal),
Wait = get(registered_names),
NewWait = lists:delete({Pid, From},Wait),
put(registered_names, NewWait),
gen_server:reply(From, Result),
{noreply, S};
%%%====================================================================================
%%% send(Name, Msg) -> Pid | {error, ErrorMessage}
%%% send({node, Node}, Name, Msg) -> Pid | {error, ErrorMessage}
%%% send({group, GlobalGroupName}, Name, Msg) -> Pid | {error, ErrorMessage}
%%%
%%% The registered Name is found; send the message to it, kill the search process,
%%% and return to the requesting process.
%%%====================================================================================
handle_cast({send_res, Result, Name, Msg, Pid, From}, S) ->
%%%io:format("~p>>>>> send_res Result ~p~n",[node(), Result]),
case Result of
{badarg,{Name, Msg}} ->
continue;
ToPid ->
ToPid ! Msg
end,
unlink(Pid),
exit(Pid, normal),
Wait = get(send),
NewWait = lists:delete({Pid, From, Name, Msg},Wait),
put(send, NewWait),
gen_server:reply(From, Result),
{noreply, S};
%%%====================================================================================
%%% A request from a search process to check if this Name is registered at this node.
%%%====================================================================================
handle_cast({find_name, User, Name}, S) ->
Res = global:whereis_name(Name),
%%%io:format(">>>>> find_name Name ~p Res ~p~n",[Name, Res]),
User ! {find_name_res, Res},
{noreply, S};
%%%====================================================================================
%%% whereis_name(Name) -> Pid | undefined
%%% whereis_name({node, Node}, Name) -> Pid | undefined
%%% whereis_name({group, GlobalGroupName}, Name) -> Pid | undefined
%%%