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1 %%%----------------------------------------------------------------------
2 %%% File : yaws_ctl.erl
3 %%% Author : Claes Wikstrom <klacke@bluetail.com>
4 %%% Purpose :
5 %%% Created : 29 Apr 2002 by Claes Wikstrom <klacke@bluetail.com>
6 %%%----------------------------------------------------------------------
7
8
9 %% some code to remoteley control a running yaws server
10
11 -module(yaws_ctl).
12 -author('klacke@bluetail.com').
13
14 -include_lib("kernel/include/file.hrl").
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15 -include("../include/yaws.hrl").
16 -include("../include/yaws_api.hrl").
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17 -include("yaws_debug.hrl").
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18
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19 -export([start/2, actl_trace/1]).
20 -export([ls/1,hup/1,stop/1,status/1,load/1,
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21 check/1,trace/1, debug_dump/1]).
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22 %% internal
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23 -export([run/1, aloop/3, handle_a/3]).
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24
25
26 %% assumes the appropriate file structures
27 %% are already created with the right perms
28
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29 start(_GC, FirstTime) when FirstTime == false ->
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30 ok;
31 start(GC, true) ->
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32 proc_lib:start_link(?MODULE, run, [GC]).
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33
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34
35 run(GC) ->
36 %% First check if there is already a Yaws system running
37 %% with the same sid.
38 case connect(GC#gconf.id) of
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39 {ok, Sock, _Key} ->
40 %% Not good, let's get some sys info
41 %% from that system so we can produce a good error
42 %% message
43 gen_tcp:close(Sock),
44 e("There is already a yaws system running with the same ~n"
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45 " id <~p> on this computer and this user, ~n"
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46 " set another id in the yaws conf file ~n",
47 [GC#gconf.id]);
48 {error, eaccess} ->
49 %% We're not allowed to open the ctl file
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50 e("Error reading ~s, you don't have access rights to read it",
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51 [yaws:ctl_file(GC#gconf.id)]);
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52 {error, _} ->
53 %% Fine, this should be the case
54 run_listen(GC)
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55 end.
56
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57 rand() ->
58 try
59 crypto:start(),
60 crypto:rand_uniform(0, 1 bsl 64)
61 catch
62 _ ->
63 {A1, A2, A3}=now(),
64 random:seed(A1, A2, A3),
65 random:uniform(1 bsl 64)
66 end.
67
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68
69 ctl_args() ->
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70 [{packet, 2},
71 {active, false},
72 binary,
73 {ip, {127,0,0,1}},
74 {reuseaddr, true}].
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75
76 run_listen(GC) ->
77 case gen_tcp:listen(0, ctl_args()) of
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78 {ok, L} ->
79 case inet:sockname(L) of
80 {ok, {_, Port}} ->
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81 Key = rand(),
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82 case w_ctl_file(GC#gconf.id, Port, Key) of
83 ok ->
84 proc_lib:init_ack(ok),
85 aloop(L, GC, Key);
86 error ->
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87 e(
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88 "Failed to create/manipulate the ctlfile ~n"
89 "called ~s~n"
90 "Either problems with permissions or "
91 " earlier runs of yaws ~nwith the same id "
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92 " <~p> as this, check dir for perms~n",
93 [yaws:ctl_file(GC#gconf.id), GC#gconf.id])
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94 end;
95 Err ->
96 e("Cannot get sockname for ctlsock: ~p",[Err] )
97 end;
98 Err ->
99 e("Cannot listen on ctl socket, fatal: ~p", [Err])
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100 end.
101
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102
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103 e(Fmt, Args) ->
104 proc_lib:init_ack({error, io_lib:format(Fmt, Args)}),
105 exit(normal).
106
107
108
109 %% write the control file, set perms of the file
110 %% so that only this user can read the file
111 %% That way we're making sure different users
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112 %% cannot manipulate each others webservers
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113 w_ctl_file(Sid, Port, Key) ->
114 case catch
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115 begin
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116 F = yaws:ctl_file(Sid),
117 error_logger:info_msg("Ctlfile : ~s~n", [F]),
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118 file:write_file(F, io_lib:format("~w.", [{Port,Key}])),
119 {ok, FI} = file:read_file_info(F),
120 ok = file:write_file_info(F, FI#file_info{mode = 8#00600})
121 end of
122 {'EXIT', _} ->
123 error;
124 _ ->
125 ok
126 end.
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127
128
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129
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130 aloop(L, GC, Key) ->
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131 case gen_tcp:accept(L) of
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132 {ok, A} ->
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133 proc_lib:spawn (?MODULE, handle_a, [A, GC, Key]);
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134 Err ->
135 error_logger:format("yaws_ctl failed to accept: ~p~n",
136 [Err]),
137 timer:sleep(2000),
138 ignore
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139 end,
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140 ?MODULE:aloop(L, GC, Key).
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141
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142 handle_a(A, GC, Key) ->
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143 case gen_tcp:recv(A, 0) of
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144 {ok, Data} ->
145 case catch binary_to_term(Data) of
146 {hup, Key} ->
147 Res = yaws:dohup(A),
148 Res;
149 {stop, Key} ->
150 gen_tcp:send(A, io_lib:format(
151 "stopping yaws with id=~p\n",
152 [GC#gconf.id])),
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153 file:delete(yaws:ctl_file(GC#gconf.id)),
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154 init:stop();
155 {{trace, What}, Key} ->
156 Res = actl_trace(What),
157 gen_tcp:send(A, Res),
158 gen_tcp:close(A);
159 {status, Key} ->
160 a_status(A),
161 gen_tcp:close(A);
162 {{load, Mods}, Key} ->
163 a_load(A, Mods),
164 gen_tcp:close(A);
165 {id, Key} ->
166 a_id(A),
167 gen_tcp:close(A);
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168 {debug_dump, Key} ->
169 a_debug_dump(A),
170 gen_tcp:close(A);
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171 {Other, Key} ->
172 gen_tcp:send(A, io_lib:format("Other: ~p~n", [Other])),
173 gen_tcp:close(A);
174 _Other ->
175 gen_tcp:close(A)
176
177 end;
178 {error, _} ->
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179 gen_tcp:close(A)
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180 end.
181
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182
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183 %% We implement this by reloading a patched config
184 actl_trace(What) ->
185 case lists:member(What, [traffic, http, off]) of
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186 true ->
187 {ok, GC, SCs} = yaws_api:getconf(),
188 case GC#gconf.trace of
189 false when What /= off->
190 yaws_api:setconf(GC#gconf{trace = {true, What}},SCs),
191 io_lib:format(
192 "Turning on trace of ~p to file ~s~n",
193 [What,
194 filename:join([GC#gconf.logdir,
195 "trace." ++ atom_to_list(What)])]);
196 false when What == off ->
197 io_lib:format("Tracing is already turned off ~n",[]);
198 {true, _} when What == off ->
199 yaws_api:setconf(GC#gconf{trace = false},SCs),
200 "Turning trace off \n";
201 {true, What} ->
202 io_lib:format("Trace of ~p is already turned on, ose 'off' "
203 "to turn off~n", [What]);
204 {true, _Other} ->
205 yaws_api:setconf(GC#gconf{trace = {true, What}},SCs),
206 io_lib:format(
207 "Turning on trace of ~p to file ~s~n",
208 [What,
209 filename:join([GC#gconf.logdir,
210 "trace." ++ atom_to_list(What)])])
211 end;
212 false ->
213 "Need either http | traffic | off as argument\n"
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214 end.
215
216
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217
218 f(Fmt, As) ->
219 io_lib:format(Fmt, As).
220
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221
222 a_id(Sock) ->
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223 ID = gen_server:call(yaws_server, id, [], infinity),
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224 gen_tcp:send(Sock, ID),
225 ok.
226
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227 a_status(Sock) ->
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228 gen_tcp:send(Sock, a_status()).
229 a_status() ->
230 try
231 {UpTime, L} = yaws_server:stats(),
232 {Days, {Hours, Minutes, _Secs}} = UpTime,
233 H = f("~n Uptime: ~w Days, ~w Hours, ~w Minutes ~n",
234 [Days, Hours, Minutes]),
235
236 T =lists:map(
237 fun({Host,IP,Hits}) ->
238 L1= f("stats for ~p at ~p ~n",
239 [Host,IP]),
240 T = "\n"
241 "URL Number of hits\n",
242 L2=lists:map(
243 fun({Url, Hits2}) ->
244 f("~-30s ~-7w ~n",
245 [Url, Hits2])
246 end, Hits),
247 END = "\n",
248 [L1, T, L2, END]
249 end, L),
250 [H, T]
251 catch
252 _:Err ->
253 io_lib:format("Cannot get status ~p~n", [Err])
254 end.
255
256
257 a_debug_dump(Sock) ->
258 gen_tcp:send(Sock, a_status()),
259 yaws_debug:do_debug_dump(Sock).
260
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261
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262 a_load(A, Mods) ->
263 case purge(Mods) of
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264 ok ->
265 gen_tcp:send(A, f("~p~n", [loadm(Mods)]));
266 Err ->
267 gen_tcp:send(A, f("~p~n", [Err]))
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268 end.
269
270 loadm([]) ->
271 [];
272 loadm([M|Ms]) ->
273 [code:load_file(M)|loadm(Ms)].
274
275 purge(Ms) ->
276 case purge(Ms, []) of
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277 [] -> ok;
278 L -> {cannot_purge, L}
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279 end.
280
281 purge([], Ack) ->
282 Ack;
283 purge([M|Ms], Ack) ->
284 case code:soft_purge(M) of
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285 true ->
286 purge(Ms, Ack);
287 false ->
288 purge(Ms, [M|Ack])
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289 end.
290
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291 connect(Sid) ->
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292 connect_file(yaws:ctl_file(Sid)).
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293
294
295 %% The ctl file contains the port number the yaws server
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296 %% is listening at and secret key string.
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297
298 connect_file(CtlFile) ->
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299 case file:consult(CtlFile) of
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300 {ok, [{Port, Key}]} ->
301 case gen_tcp:connect({127,0,0,1}, Port,
302 [{active, false},
303 {reuseaddr, true},
304 binary,
305 {packet, 2}], 2000) of
306 {ok, Socket} ->
307 {ok, Socket, Key};
308 Err ->
309 Err
310 end;
311 Err ->
312 Err
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313 end.
314
315
316
317 actl(SID, Term) ->
318 case connect(SID) of
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319 {error, eaccess} ->
320 io:format("Another user is using the yaws sid <~p>, ~n"
321 "You are not allowd to read the file <~s>, ~n"
322 "specify by <-I id> which yaws system you want "
323 " to control~n",
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324 [SID, yaws:ctl_file(SID)]),
325 timer:sleep(10),
326 erlang:halt(1);
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327 {error, econnrefused} ->
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328 io:format("No yaws system responds~n",[]),
329 timer:sleep(10),
330 erlang:halt(2);
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331 {error, Reason} ->
332 io:format("You failed to read the ctlfile ~s~n"
333 "error was: <~p>~n"
334 "specify by <-I id> which yaws system you want "
335 " to control~n",
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336 [yaws:ctl_file(SID), Reason]),
337 timer:sleep(10),
338 erlang:halt(3);
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339 {ok, Socket, Key} ->
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340 gen_tcp:send(Socket, term_to_binary({Term, Key})),
341 Ret = s_cmd(Socket, SID, 0),
342 timer:sleep(40), %% sucks bigtime, we have no good way to flush io
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343 case Ret of
344 ok ->
345 erlang:halt(0);
346 error ->
347 erlang:halt(4)
348 end
349 end.
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350
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351
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352 s_cmd(Fd, SID, Count) ->
353 case gen_tcp:recv(Fd, 0) of
354 {ok, Bin} ->
355 io:format("~s", [binary_to_list(Bin)]),
356 s_cmd(Fd, SID, Count+1);
357 {error, closed} when Count > 0 ->
358 gen_tcp:close(Fd);
359 Err ->
360 io_lib:format("yaws server for yaws id <~p> not "
361 "responding: ~p ~n", [SID, Err]),
362 error
363 end.
364
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365
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366
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367 %% List existing yaws nodes on this machine for this user
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368 ls(_) ->
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369 Dir = filename:join([yaws:tmpdir(), "yaws"]),
370 case file:list_dir(Dir) of
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371 {ok, List} ->
372 io:format("~-15s~-10s~-10s~n",
373 ["Id", "Status", "Owner"]),
374 io:format("-------------------------------------~n",[]),
375 lists:foreach(
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376 fun(IdDir) ->
377 lls(IdDir)
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378 end, List);
379 _ ->
380 ok
381
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382 end,
383 init:stop().
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384
385
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386 lls(IdDir) ->
387 CtlFile = yaws:ctl_file(IdDir),
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388 case {file:read_file_info(CtlFile),
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389 file:read_file(CtlFile)} of
390 {{ok, FI}, {error, eacces}} ->
391 User = yaws:uid_to_name(FI#file_info.uid),
392 io:format("~-15s~-10s~-10s~n",
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393 [IdDir, "noaccess", User]);
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394 {{ok, FI}, {ok, _Bin}} ->
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395 Running = case connect(IdDir) of
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396 {ok, Sock, _Key} ->
397 gen_tcp:close(Sock),
398 "running";
399 {error, timeout} ->
400 "hanging??";
401 {error, eacces} ->
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402 "noaccess";
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403 _Err ->
404 "stopped"
405 end,
406 User = yaws:uid_to_name(FI#file_info.uid),
407 io:format("~-15s~-10s~-10s~n",
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408 [IdDir, Running, User]);
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409 _ ->
410 ok
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411 end.
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412
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413
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414
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415 %% send a hup (kindof) to the yaws server to make it
416 %% reload its configuration and clear its caches
417
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418 hup([SID]) ->
419 actl(SID, hup).
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420
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421
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422 %% stop a daemon
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423 stop([SID]) ->
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424 actl(SID, stop).
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425
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426 %% query a daemon for status/stats
427 status([SID]) ->
428 actl(SID, status).
429
430 load(X) ->
431 [SID | Modules] = lists:reverse(X),
432 actl(SID, {load, Modules}).
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433
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434 check([Id, File| IncludeDirs]) ->
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435 GC = yaws_config:make_default_gconf(false, undefined),
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436 GC2 = GC#gconf{include_dir = lists:map(fun(X) -> atom_to_list(X) end,
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437 IncludeDirs),
438 id = atom_to_list(Id)
439 },
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440 yaws_server:setup_dirs(GC2),
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441 put(sc, #sconf{}),
442 put(gc, GC2),
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443 put(use_yfile_name, true),
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444 case yaws_compile:compile_file(atom_to_list(File)) of
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445 {ok, [{errors, 0}| _Spec]} ->
446 timer:sleep(100),erlang:halt(0);
447 % init:stop();
448 _Other ->
449 timer:sleep(100),erlang:halt(1)
450 % init:stop()
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451 end.
452
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453 %% control a daemon http/traffic tracer
454 trace([What, SID]) ->
455 actl(SID, {trace, What}).
456
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457 debug_dump([SID]) ->
458 actl(SID, debug_dump).
459
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460
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