aboutsummaryrefslogtreecommitdiffstats
path: root/lib/kernel/test/loose_node.erl
blob: ac1ddb8d9a52d4b8886839f75b3f0ff9845c0db8 (plain) (blame)
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
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2004-2009. 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%
%%

%%%-------------------------------------------------------------------
%%% File    : loose_node.erl
%%% Author  : Rickard Green <rickard.s.green@ericsson.com>
%%% Description : Creation of nodes which are not supervised by
%%%               the test_server. Currently needed by init_SUITE
%%%               and heart_SUITE (until the test_server can
%%%               handle node restart).
%%%
%%% Created : 22 Sep 2004 by Rickard Green <rickard.s.green@ericsson.com>
%%%-------------------------------------------------------------------
-module(loose_node).
-author('rickard.s.green@ericsson.com').

%%
%% Exports
%%
-export([start/3, start/2, stop/1]).

%%
%% Internal exports
%%
-export([loose_node_started/1]).

%% 
%% Exported functions for internal use.
%%

%%
%% Defines
%%
-define(L2A, list_to_atom).
-define(A2L, atom_to_list).
-define(I2L, integer_to_list).

%% 
%% Exported functions.
%%

stop(Node) when atom(Node) ->
    rpc:cast(Node, erlang, halt, []),
    io:format("Stopped loose node ~p~n", [Node]),
    ok.

start(Name, Args) ->
    start(Name, Args, -1).

start(Name, Args, TimeOut) when atom(Name) ->
    start(atom_to_list(Name), Args, TimeOut);
start(Name, Args, TimeOut) when list(Name), list(Args), integer(TimeOut) ->
    Parent = self(),
    Ref = make_ref(),
    Starter
	= fun () ->
		  Erl = case init:get_argument(progname) of
			    {ok,[[Prog]]} ->
				Prog;
			    _ ->
				"erl"
			end,
		  RegName = until_success(fun () ->
						  {A, B, C} = now(),
						  Reg =
						      ?L2A(?A2L(?MODULE)
							   ++ "-" ++ ?I2L(A)
							   ++ "-" ++ ?I2L(B)
							   ++ "-" ++ ?I2L(C)),
						  true = register(Reg, self()),
						  Reg
					  end),
		  NameCmd = case net_kernel:longnames() of
				true ->  " -name " ++ Name;
				false -> " -sname " ++ Name
			    end,
		  Cookie = " -setcookie " ++ atom_to_list(auth:get_cookie()),
		  Pa = " -pa " ++ filename:dirname(code:which(?MODULE)),
		  ThisNode = node(),
		  NodeStarted
		      = " -run "
		      ++ atom_to_list(?MODULE)
		      ++ " loose_node_started "
		      ++ atom_to_list(RegName)
		      ++ " "
		      ++ atom_to_list(ThisNode)
		      ++ " "
		      ++ integer_to_list(TimeOut),
		  CrashDump =
		      " -env ERL_CRASH_DUMP"
		      ++ " erl_crash.dump.loose_node."
		      ++ Name,
		  Cmd =
		      Erl
		      ++ " -detached"
		      ++ NameCmd
		      ++ Cookie
		      ++ Pa
		      ++ NodeStarted
		      ++ CrashDump
		      ++ " "
		      ++ Args,
		  io:format("Trying to start loose node...~n"
			    "  --> ~p~n", [Cmd]),
		  Res = case open_port({spawn, Cmd}, []) of
			    P when port(P) ->
				receive
				    {loose_node_started,
				     Node,
				     {RegName, ThisNode}} ->
					io:format("Loose node ~p started.~n",
						  [Node]),
					{ok, Node}
				after 10000 ->	
					io:format("Start of loose node ~p "
						  "timed out.", [Name]),
					{error, timeout}
				end;
			    _ ->
				io:format("Start of loose node ~p failed.",
					  [Name]),
				{error, open_port_failed}
			end,
		  Parent ! {Ref, Res}
	  end,
    spawn_opt(Starter, [link, {priority, max}]),
    receive
	{Ref, Result} ->
	    Result
    end.


%% 
%% Exported functions for internal use.
%%

loose_node_started([Name, Node, TimeOutSecs]) when list(Name),
						   list(Node),
						   list(TimeOutSecs) ->
    spawn_opt(fun () ->
		      process_flag(trap_exit, true),
		      Proc = {list_to_atom(Name), list_to_atom(Node)},
		      Timeout = case catch list_to_integer(TimeOutSecs) of
				    I when integer(I), I >= 0 -> I*1000;
				    _ -> infinity
				end,
		      wait_until(fun () -> is_alive() end),
		      Proc ! {loose_node_started, node(), Proc},
		      receive
		      after Timeout ->
			      timeout
		      end,
		      erlang:halt("Loose node timeout")
	      end,
	      [{priority, max}]),
    ok.

%% 
%% Internal functions.
%%

until_success(Fun) ->
    case catch Fun() of
	{'EXIT', _} -> until_success(Fun);
	Res -> Res
    end.

wait_until(Fun) -> 
    case Fun() of
	true -> true;
	_ ->
	    receive
	    after 100 ->
		    wait_until(Fun)
	    end
    end.