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%% -*- erlang -*-
%% -------------------------------------------------------------------
%%
%% nodetool: Helper Script for interacting with live nodes
%%
%% -------------------------------------------------------------------
main(Args) ->
%% Extract the args
{RestArgs, TargetNode} = process_args(Args, [], undefined),
%% See if the node is currently running -- if it's not, we'll bail
case net_adm:ping(TargetNode) of
pong ->
ok;
pang ->
io:format("Node ~p not responding to pings.\n", [TargetNode]),
halt(1)
end,
case RestArgs of
["ping"] ->
%% If we got this far, the node already responsed to a ping, so just dump
%% a "pong"
io:format("pong\n");
["stop"] ->
io:format("~p\n", [rpc:call(TargetNode, init, stop, [], 60000)]);
["restart"] ->
io:format("~p\n", [rpc:call(TargetNode, init, restart, [], 60000)]);
["reboot"] ->
io:format("~p\n", [rpc:call(TargetNode, init, reboot, [], 60000)]);
["rpc", Module, Function | RpcArgs] ->
case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function), [RpcArgs], 60000) of
ok ->
ok;
{badrpc, Reason} ->
io:format("RPC to ~p failed: ~p\n", [TargetNode, Reason]),
halt(1);
_ ->
halt(1)
end;
Other ->
io:format("Other: ~p\n", [Other]),
io:format("Usage: nodetool {ping|stop|restart|reboot}\n")
end,
net_kernel:stop().
process_args([], Acc, TargetNode) ->
{lists:reverse(Acc), TargetNode};
process_args(["-setcookie", Cookie | Rest], Acc, TargetNode) ->
erlang:set_cookie(node(), list_to_atom(Cookie)),
process_args(Rest, Acc, TargetNode);
process_args(["-name", TargetName | Rest], Acc, _) ->
ThisNode = append_node_suffix(TargetName, "_maint_"),
{ok, _} = net_kernel:start([ThisNode, longnames]),
process_args(Rest, Acc, nodename(TargetName));
process_args(["-sname", TargetName | Rest], Acc, _) ->
ThisNode = append_node_suffix(TargetName, "_maint_"),
{ok, _} = net_kernel:start([ThisNode, shortnames]),
process_args(Rest, Acc, nodename(TargetName));
process_args([Arg | Rest], Acc, Opts) ->
process_args(Rest, [Arg | Acc], Opts).
nodename(Name) ->
case string:tokens(Name, "@") of
[_Node, _Host] ->
list_to_atom(Name);
[Node] ->
[_, Host] = string:tokens(atom_to_list(node()), "@"),
list_to_atom(lists:concat([Node, "@", Host]))
end.
append_node_suffix(Name, Suffix) ->
case string:tokens(Name, "@") of
[Node, Host] ->
list_to_atom(lists:concat([Node, Suffix, os:getpid(), "@", Host]));
[Node] ->
list_to_atom(lists:concat([Node, Suffix, os:getpid()]))
end.
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