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
|
%% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ft=erlang ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% nodetool: Helper Script for interacting with live nodes
%%
%% -------------------------------------------------------------------
main(Args) ->
ok = start_epmd(),
%% 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_kernel:hidden_connect_node(TargetNode), net_adm:ping(TargetNode)} of
{true, 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;
["rpcterms", Module, Function | ArgsAsString] ->
case rpc:call(TargetNode, list_to_atom(Module), list_to_atom(Function),
consult(ArgsAsString), 60000) of
{badrpc, Reason} ->
io:format("RPC to ~p failed: ~p\n", [TargetNode, Reason]),
halt(1);
Other ->
io:format("~p\n", [Other])
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).
start_epmd() ->
[] = os:cmd("\"" ++ epmd_path() ++ "\" -daemon"),
ok.
epmd_path() ->
ErtsBinDir = filename:dirname(escript:script_name()),
Name = "epmd",
case os:find_executable(Name, ErtsBinDir) of
false ->
case os:find_executable(Name) of
false ->
io:format("Could not find epmd.~n"),
halt(1);
GlobalEpmd ->
GlobalEpmd
end;
Epmd ->
Epmd
end.
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.
%%
%% Given a string or binary, parse it into a list of terms, ala file:consult/0
%%
consult(Str) when is_list(Str) ->
consult([], Str, []);
consult(Bin) when is_binary(Bin)->
consult([], binary_to_list(Bin), []).
consult(Cont, Str, Acc) ->
case erl_scan:tokens(Cont, Str, 0) of
{done, Result, Remaining} ->
case Result of
{ok, Tokens, _} ->
{ok, Term} = erl_parse:parse_term(Tokens),
consult([], Remaining, [Term | Acc]);
{eof, _Other} ->
lists:reverse(Acc);
{error, Info, _} ->
{error, Info}
end;
{more, Cont1} ->
consult(Cont1, eof, Acc)
end.
|
