root/src/modules/lua.c

Revision b1133af9f85966fc31d2bee8a38cb7a8561807fe, 26.4 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 3 years ago)

The original approach was right, just messed up the lua_state onto which we were pushing

  • Property mode set to 100644
Line 
1 /*
2  * Copyright (c) 2007-2010, OmniTI Computer Consulting, Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  *     * Redistributions of source code must retain the above copyright
10  *       notice, this list of conditions and the following disclaimer.
11  *     * Redistributions in binary form must reproduce the above
12  *       copyright notice, this list of conditions and the following
13  *       disclaimer in the documentation and/or other materials provided
14  *       with the distribution.
15  *     * Neither the name OmniTI Computer Consulting, Inc. nor the names
16  *       of its contributors may be used to endorse or promote products
17  *       derived from this software without specific prior written
18  *       permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 #include "noit_defines.h"
34
35 #include "noit_conf.h"
36 #include "noit_module.h"
37 #include "noit_check.h"
38 #include "noit_check_tools.h"
39 #include "utils/noit_log.h"
40 #include "lua_noit.h"
41
42 #ifdef HAVE_ALLOCA_H
43 #include <alloca.h>
44 #endif
45 #include <assert.h>
46
47 static noit_log_stream_t nlerr = NULL;
48 static noit_log_stream_t nldeb = NULL;
49 static noit_hash_table noit_coros = NOIT_HASH_EMPTY;
50
51 struct loader_conf {
52   char *script_dir;
53 };
54 static struct loader_conf *__get_loader_conf(noit_module_loader_t *self) {
55   struct loader_conf *c;
56   c = noit_image_get_userdata(&self->hdr);
57   if(!c) {
58     c = calloc(1, sizeof(*c));
59     noit_image_set_userdata(&self->hdr, c);
60   }
61   return c;
62 }
63 static void
64 noit_lua_loader_set_directory(noit_module_loader_t *self, const char *dir) {
65   struct loader_conf *c = __get_loader_conf(self);
66   if(c->script_dir) free(c->script_dir);
67   c->script_dir = strdup(dir);
68 }
69 static const char *
70 noit_lua_loader_get_directory(noit_module_loader_t *self) {
71   struct loader_conf *c = __get_loader_conf(self);
72   return c->script_dir;
73 }
74
75 void
76 cancel_coro(noit_lua_check_info_t *ci) {
77   lua_getglobal(ci->lmc->lua_state, "noit_coros");
78   luaL_unref(ci->lmc->lua_state, -1, ci->coro_state_ref);
79   lua_pop(ci->lmc->lua_state, 1);
80   lua_gc(ci->lmc->lua_state, LUA_GCCOLLECT, 0);
81   noit_hash_delete(&noit_coros,
82                    (const char *)&ci->coro_state, sizeof(ci->coro_state),
83                    NULL, NULL);
84 }
85
86 noit_lua_check_info_t *
87 get_ci(lua_State *L) {
88   void *v = NULL;
89   if(noit_hash_retrieve(&noit_coros, (const char *)&L, sizeof(L), &v))
90     return (noit_lua_check_info_t *)v;
91   return NULL;
92 }
93 static void
94 int_cl_free(void *vcl) {
95   free(vcl);
96 }
97
98 static void
99 noit_event_dispose(void *ev) {
100   int mask;
101   eventer_t *value = ev;
102   eventer_t removed, e = *value;
103   noitL(nldeb, "lua check cleanup: dropping (%p)->fd (%d)\n", e, e->fd);
104   if(e->mask & (EVENTER_READ|EVENTER_WRITE|EVENTER_EXCEPTION)) {
105     noitL(nldeb, "    closing down fd %d\n", e->fd);
106     e->opset->close(e->fd, &mask, e);
107   }
108   removed = eventer_remove(e);
109   noitL(nldeb, "    remove from eventer system %s\n",
110         removed ? "succeeded" : "failed");
111   if(e->closure) {
112     struct nl_generic_cl *cl;
113     cl = e->closure;
114     if(cl->free) cl->free(cl);
115   }
116   eventer_free(e);
117   free(ev);
118 }
119 void
120 noit_lua_check_register_event(noit_lua_check_info_t *ci, eventer_t e) {
121   eventer_t *eptr;
122   eptr = calloc(1, sizeof(*eptr));
123   memcpy(eptr, &e, sizeof(*eptr));
124   if(!ci->events) ci->events = calloc(1, sizeof(*ci->events));
125   assert(noit_hash_store(ci->events, (const char *)eptr, sizeof(*eptr), eptr));
126 }
127 void
128 noit_lua_check_deregister_event(noit_lua_check_info_t *ci, eventer_t e,
129                                 int tofree) {
130   assert(ci->events);
131   assert(noit_hash_delete(ci->events, (const char *)&e, sizeof(e),
132                           NULL, tofree ? noit_event_dispose : free));
133 }
134 void
135 noit_lua_check_clean_events(noit_lua_check_info_t *ci) {
136   if(ci->events == NULL) return;
137   noit_hash_destroy(ci->events, NULL, noit_event_dispose);
138   free(ci->events);
139   ci->events = NULL;
140 }
141
142 static void
143 noit_lua_pushmodule(lua_State *L, const char *m) {
144   int stack_pos = LUA_GLOBALSINDEX;
145   char *copy, *part, *brkt;
146   copy = alloca(strlen(m)+1);
147   assert(copy);
148   memcpy(copy,m,strlen(m)+1);
149
150   for(part = strtok_r(copy, ".", &brkt);
151       part;
152       part = strtok_r(NULL, ".", &brkt)) {
153     lua_getfield(L, stack_pos, part);
154     if(stack_pos == -1) lua_remove(L, -2);
155     else stack_pos = -1;
156   }
157 }
158 static void
159 noit_lua_hash_to_table(lua_State *L,
160                        noit_hash_table *t) {
161   noit_hash_iter iter = NOIT_HASH_ITER_ZERO;
162   const char *key, *value;
163   int klen;
164   lua_createtable(L, 0, t ? t->size : 0);
165   if(t) {
166     while(noit_hash_next_str(t, &iter, &key, &klen, &value)) {
167       lua_pushlstring(L, value, strlen(value));
168       lua_setfield(L, -2, key);
169     }
170   }
171   return;
172 }
173 static int
174 noit_lua_module_set_description(lua_State *L) {
175   noit_module_t *module;
176   module = lua_touserdata(L, lua_upvalueindex(1));
177   if(lua_gettop(L) == 1)
178     module->hdr.description = strdup(lua_tostring(L, 1));
179   else if(lua_gettop(L) > 1)
180     luaL_error(L, "wrong number of arguments");
181   lua_pushstring(L, module->hdr.description);
182   return 1;
183 }
184 static int
185 noit_lua_module_set_name(lua_State *L) {
186   noit_module_t *module;
187   module = lua_touserdata(L, lua_upvalueindex(1));
188   if(lua_gettop(L) == 1)
189     module->hdr.name = strdup(lua_tostring(L, 1));
190   else if(lua_gettop(L) > 1)
191     luaL_error(L, "wrong number of arguments");
192   lua_pushstring(L, module->hdr.name);
193   return 1;
194 }
195 static int
196 noit_lua_module_set_xml_description(lua_State *L) {
197   noit_module_t *module;
198   module = lua_touserdata(L, lua_upvalueindex(1));
199   if(lua_gettop(L) == 1)
200     module->hdr.xml_description = strdup(lua_tostring(L, 1));
201   else if(lua_gettop(L) > 1)
202     luaL_error(L, "wrong number of arguments");
203   lua_pushstring(L, module->hdr.xml_description);
204   return 1;
205 }
206 static int
207 noit_module_index_func(lua_State *L) {
208   noit_module_t **udata, *module;
209   const char *k;
210   int n;
211   n = lua_gettop(L);    /* number of arguments */
212   assert(n == 2);
213   if(!luaL_checkudata(L, 1, "noit_module_t")) {
214     luaL_error(L, "metatable error, arg1 not a noit_module_t!");
215   }
216   udata = lua_touserdata(L, 1);
217   module = *udata;
218   if(!lua_isstring(L, 2)) {
219     luaL_error(L, "metatable error, arg2 not a string!");
220   }
221   k = lua_tostring(L, 2);
222   switch(*k) {
223     case 'd':
224       if(!strcmp(k, "description")) {
225         lua_pushlightuserdata(L, module);
226         lua_pushcclosure(L, noit_lua_module_set_description, 1);
227       }
228       else break;
229       return 1;
230     case 'n':
231       if(!strcmp(k, "name")) {
232         lua_pushlightuserdata(L, module);
233         lua_pushcclosure(L, noit_lua_module_set_name, 1);
234       }
235       else break;
236       return 1;
237     case 'x':
238       if(!strcmp(k, "xml_description")) {
239         lua_pushlightuserdata(L, module);
240         lua_pushcclosure(L, noit_lua_module_set_xml_description, 1);
241       }
242       else break;
243       return 1;
244     default:
245       break;
246   }
247   luaL_error(L, "noit_module_t no such element: %s", k);
248   return 0;
249 }
250 static int
251 noit_lua_get_available(lua_State *L) {
252   char av[2] = { '\0', '\0' };
253   noit_check_t *check;
254   noit_lua_check_info_t *ci;
255   if(lua_gettop(L)) luaL_error(L, "wrong number of arguments");
256   check = lua_touserdata(L, lua_upvalueindex(1));
257   av[0] = (char)check->stats.current.available;
258   lua_pushstring(L, av);
259   return 1;
260 }
261 static int
262 noit_lua_set_available(lua_State *L) {
263   noit_check_t *check;
264   noit_lua_check_info_t *ci;
265   if(lua_gettop(L)) luaL_error(L, "wrong number of arguments");
266   check = lua_touserdata(L, lua_upvalueindex(1));
267   ci = check->closure;
268   ci->current.available = lua_tointeger(L, lua_upvalueindex(2));
269   return 0;
270 }
271 static int
272 noit_lua_get_state(lua_State *L) {
273   char status[2] = { '\0', '\0' };
274   noit_check_t *check;
275   noit_lua_check_info_t *ci;
276   if(lua_gettop(L)) luaL_error(L, "wrong number of arguments");
277   check = lua_touserdata(L, lua_upvalueindex(1));
278   status[0] = (char)check->stats.current.state;
279   lua_pushstring(L, status);
280   return 1;
281 }
282 static int
283 noit_lua_set_state(lua_State *L) {
284   noit_check_t *check;
285   noit_lua_check_info_t *ci;
286   if(lua_gettop(L)) luaL_error(L, "wrong number of arguments");
287   check = lua_touserdata(L, lua_upvalueindex(1));
288   ci = check->closure;
289   ci->current.state = lua_tointeger(L, lua_upvalueindex(2));
290   return 0;
291 }
292 static int
293 noit_lua_set_status(lua_State *L) {
294   const char *ns;
295   noit_check_t *check;
296   noit_lua_check_info_t *ci;
297   if(lua_gettop(L) != 1) luaL_error(L, "wrong number of arguments");
298   check = lua_touserdata(L, lua_upvalueindex(1));
299   ci = check->closure;
300   /* strdup here... but free later */
301   if(ci->current.status) free(ci->current.status);
302   ns = lua_tostring(L, 1);
303   ci->current.status = ns ? strdup(ns) : NULL;
304   return 0;
305 }
306 static int
307 noit_lua_set_metric(lua_State *L) {
308   noit_check_t *check;
309   noit_lua_check_info_t *ci;
310   const char *metric_name;
311   metric_type_t metric_type;
312
313   double __n = 0.0;
314   int32_t __i = 0;
315   u_int32_t __I = 0;
316   int64_t __l = 0;
317   u_int64_t __L = 0;
318
319   if(lua_gettop(L) != 2) luaL_error(L, "wrong number of arguments");
320   check = lua_touserdata(L, lua_upvalueindex(1));
321   ci = check->closure;
322   if(!lua_isstring(L, 1)) luaL_error(L, "argument #1 must be a string");
323   metric_name = lua_tostring(L, 1);
324   metric_type = lua_tointeger(L, lua_upvalueindex(2));
325   if(lua_isnil(L, 2)) {
326     noit_stats_set_metric(&ci->current, metric_name, metric_type, NULL);
327     lua_pushboolean(L, 1);
328     return 1;
329   }
330   switch(metric_type) {
331     case METRIC_INT32:
332     case METRIC_UINT32:
333     case METRIC_INT64:
334     case METRIC_UINT64:
335     case METRIC_DOUBLE:
336       if(!lua_isnumber(L, 2)) {
337         noit_stats_set_metric(&ci->current, metric_name, metric_type, NULL);
338         lua_pushboolean(L, 0);
339         return 1;
340       }
341     default:
342     break;
343   }
344   switch(metric_type) {
345     case METRIC_GUESS:
346     case METRIC_STRING:
347       noit_stats_set_metric(&ci->current, metric_name, metric_type,
348                             (void *)lua_tostring(L, 2));
349       break;
350     case METRIC_INT32:
351       __i = strtol(lua_tostring(L, 2), NULL, 10);
352       noit_stats_set_metric(&ci->current, metric_name, metric_type, &__i);
353       break;
354     case METRIC_UINT32:
355       __I = strtoul(lua_tostring(L, 2), NULL, 10);
356       noit_stats_set_metric(&ci->current, metric_name, metric_type, &__I);
357       break;
358     case METRIC_INT64:
359       __l = strtoll(lua_tostring(L, 2), NULL, 10);
360       noit_stats_set_metric(&ci->current, metric_name, metric_type, &__l);
361       break;
362     case METRIC_UINT64:
363       __L = strtoull(lua_tostring(L, 2), NULL, 10);
364       noit_stats_set_metric(&ci->current, metric_name, metric_type, &__L);
365       break;
366     case METRIC_DOUBLE:
367       __n = luaL_optnumber(L, 2, 0);
368       noit_stats_set_metric(&ci->current, metric_name, metric_type, &__n);
369       break;
370   }
371   lua_pushboolean(L, 1);
372   return 1;
373 }
374 static int
375 noit_check_index_func(lua_State *L) {
376   int n;
377   const char *k;
378   noit_check_t **udata, *check;
379   n = lua_gettop(L);    /* number of arguments */
380   assert(n == 2);
381   if(!luaL_checkudata(L, 1, "noit_check_t")) {
382     luaL_error(L, "metatable error, arg1 not a noit_check_t!");
383   }
384   udata = lua_touserdata(L, 1);
385   check = *udata;
386   if(!lua_isstring(L, 2)) {
387     luaL_error(L, "metatable error, arg2 not a string!");
388   }
389   k = lua_tostring(L, 2);
390   switch(*k) {
391     case 'a':
392       if(!strcmp(k, "available")) {
393         lua_pushlightuserdata(L, check);
394         lua_pushinteger(L, NP_AVAILABLE);
395         lua_pushcclosure(L, noit_lua_set_available, 2);
396       }
397       else if(!strcmp(k, "availability")) {
398         lua_pushlightuserdata(L, check);
399         lua_pushcclosure(L, noit_lua_get_available, 1);
400       }
401       else break;
402       return 1;
403     case 'b':
404       if(!strcmp(k, "bad")) {
405         lua_pushlightuserdata(L, check);
406         lua_pushinteger(L, NP_BAD);
407         lua_pushcclosure(L, noit_lua_set_state, 2);
408       }
409       else break;
410       return 1;
411     case 'c':
412       if(!strcmp(k, "config")) noit_lua_hash_to_table(L, check->config);
413       else break;
414       return 1;
415     case 'g':
416       if(!strcmp(k, "good")) {
417         lua_pushlightuserdata(L, check);
418         lua_pushinteger(L, NP_GOOD);
419         lua_pushcclosure(L, noit_lua_set_state, 2);
420       }
421       else break;
422       return 1;
423     case 'm':
424       if(!strcmp(k, "module")) lua_pushstring(L, check->module);
425
426 #define IF_METRIC_BLOCK(name,type) \
427       if(!strcmp(k, name)) { \
428         lua_pushlightuserdata(L, check); \
429         lua_pushinteger(L, type); \
430         lua_pushcclosure(L, noit_lua_set_metric, 2); \
431       }
432
433       else IF_METRIC_BLOCK("metric", METRIC_GUESS)
434       else IF_METRIC_BLOCK("metric_string", METRIC_STRING)
435       else IF_METRIC_BLOCK("metric_int32", METRIC_INT32)
436       else IF_METRIC_BLOCK("metric_uint32", METRIC_UINT32)
437       else IF_METRIC_BLOCK("metric_int64", METRIC_INT64)
438       else IF_METRIC_BLOCK("metric_uint64", METRIC_UINT64)
439       else IF_METRIC_BLOCK("metric_double", METRIC_DOUBLE)
440       else break;
441       return 1;
442     case 'n':
443       if(!strcmp(k, "name")) lua_pushstring(L, check->name);
444       else break;
445       return 1;
446     case 'p':
447       if(!strcmp(k, "period")) lua_pushinteger(L, check->period);
448       else break;
449       return 1;
450     case 's':
451       if(!strcmp(k, "state")) {
452         lua_pushlightuserdata(L, check);
453         lua_pushcclosure(L, noit_lua_get_state, 1);
454       }
455       else if(!strcmp(k, "status")) {
456         lua_pushlightuserdata(L, check);
457         lua_pushcclosure(L, noit_lua_set_status, 1);
458       }
459       else break;
460       return 1;
461     case 't':
462       if(!strcmp(k, "target")) lua_pushstring(L, check->target);
463       else if(!strcmp(k, "target_ip")) {
464         if(check->target_ip[0] == '\0') lua_pushnil(L);
465         else lua_pushstring(L, check->target_ip);
466       }
467       else if(!strcmp(k, "timeout")) lua_pushinteger(L, check->timeout);
468       else break;
469       return 1;
470     case 'u':
471       if(!strcmp(k, "unavailable")) {
472         lua_pushlightuserdata(L, check);
473         lua_pushinteger(L, NP_UNAVAILABLE);
474         lua_pushcclosure(L, noit_lua_set_available, 2);
475       }
476       else break;
477       return 1;
478     default:
479       break;
480   }
481   luaL_error(L, "noit_check_t no such element: %s", k);
482   return 0;
483 }
484 static void
485 noit_lua_setup_module(lua_State *L,
486                       noit_module_t *mod) {
487   noit_module_t **addr;
488   addr = (noit_module_t **)lua_newuserdata(L, sizeof(mod));
489   *addr = mod;
490   if(luaL_newmetatable(L, "noit_module_t") == 1) {
491     lua_pushcclosure(L, noit_module_index_func, 0);
492     lua_setfield(L, -2, "__index");
493   }
494   lua_setmetatable(L, -2);
495 }
496 static void
497 noit_lua_setup_check(lua_State *L,
498                      noit_check_t *check) {
499   noit_check_t **addr;
500   addr = (noit_check_t **)lua_newuserdata(L, sizeof(check));
501   *addr = check;
502   if(luaL_newmetatable(L, "noit_check_t") == 1) {
503     lua_pushcclosure(L, noit_check_index_func, 0);
504     lua_setfield(L, -2, "__index");
505   }
506   lua_setmetatable(L, -2);
507 }
508 static int
509 noit_lua_module_onload(noit_image_t *i) {
510   int rv;
511   lua_State *L;
512   lua_module_closure_t *lmc;
513
514   noit_lua_init();
515
516   lmc = noit_image_get_userdata(i);
517   L = lmc->lua_state;
518   lua_getglobal(L, "require");
519   lua_pushstring(L, lmc->object);
520   rv = lua_pcall(L, 1, 1, 0);
521   if(rv) {
522     int i;
523     noitL(nlerr, "lua: %s.onload failed\n", lmc->object);
524     i = lua_gettop(L);
525     if(i>0) {
526       if(lua_isstring(L, i)) {
527         const char *err;
528         size_t len;
529         err = lua_tolstring(L, i, &len);
530         noitL(nlerr, "lua: %s\n", err);
531       }
532     }
533     lua_pop(L,i);
534     return -1;
535   }
536   lua_pop(L, lua_gettop(L));
537
538   noit_lua_pushmodule(L, lmc->object);
539   if(lua_isnil(L, -1)) {
540     lua_pop(L, 1);
541     noitL(nlerr, "lua: no such object %s\n", lmc->object);
542     return -1;
543   }
544   lua_getfield(L, -1, "onload");
545   lua_remove(L, -2);
546   if(!lua_isfunction(L, -1)) {
547     lua_pop(L, 1);
548     /* No onload */
549     return 0;
550   }
551   noit_lua_setup_module(L, (noit_module_t *)i);
552   lua_pcall(L, 1, 1, 0);
553   if(lua_isnumber(L, -1)) {
554     int rv;
555     rv = lua_tointeger(L, -1);
556     lua_pop(L, 1);
557     return rv;
558   }
559   lua_pop(L,1);
560   noitL(nlerr, "%s.onload must return a integer\n", lmc->object);
561   return -1;
562 }
563 #define LMC_DECL(L, mod) \
564   lua_State *L; \
565   lua_module_closure_t *lmc; \
566   lmc = noit_module_get_userdata(mod); \
567   L = lmc->lua_state
568 #define SETUP_CALL(L, func, failure) do { \
569   noit_lua_pushmodule(L, lmc->object); \
570   lua_getfield(L, -1, func); \
571   lua_remove(L, -2); \
572   if(!lua_isfunction(L, -1)) { \
573     lua_pop(L, 1); \
574     failure; \
575   } \
576 } while(0)
577 #define RETURN_INT(L, func) do { \
578   int base = lua_gettop(L); \
579   assert(base == 1); \
580   if(lua_isnumber(L, -1)) { \
581     int rv; \
582     rv = lua_tointeger(L, -1); \
583     lua_pop(L, 1); \
584     return rv; \
585   } \
586   lua_pop(L,1); \
587   noitL(nlerr, "%s.%s must return a integer\n", lmc->object, func); \
588 } while(0)
589
590 static int
591 noit_lua_module_config(noit_module_t *mod,
592                        noit_hash_table *options) {
593   LMC_DECL(L, mod);
594   SETUP_CALL(L, "config", return 0);
595
596   noit_lua_setup_module(L, mod);
597   noit_lua_hash_to_table(L, options);
598   lua_pcall(L, 2, 1, 0);
599
600   RETURN_INT(L, "config");
601   return -1;
602 }
603 static int
604 noit_lua_module_init(noit_module_t *mod) {
605   LMC_DECL(L, mod);
606   SETUP_CALL(L, "init", return 0);
607
608   noit_lua_setup_module(L, mod);
609   lua_pcall(L, 1, 1, 0);
610
611   RETURN_INT(L, "init");
612   return -1;
613 }
614 static void
615 noit_lua_module_cleanup(noit_module_t *mod, noit_check_t *check) {
616   noit_lua_check_info_t *ci = check->closure;
617   LMC_DECL(L, mod);
618   SETUP_CALL(L, "cleanup", goto clean);
619
620   noit_lua_setup_module(L, mod);
621   noit_lua_setup_check(L, check);
622   lua_pcall(L, 2, 0, 0);
623
624  clean:
625   if(ci) {
626     noit_lua_check_clean_events(ci);
627     free(ci);
628     check->closure = NULL;
629   }
630 }
631
632 /* Here is where the magic starts */
633 static void
634 noit_lua_log_results(noit_module_t *self, noit_check_t *check) {
635   noit_lua_check_info_t *ci = check->closure;
636   struct timeval duration;
637
638   gettimeofday(&ci->finish_time, NULL);
639   sub_timeval(ci->finish_time, check->last_fire_time, &duration);
640
641   memcpy(&ci->current.whence, &ci->finish_time, sizeof(ci->current.whence));
642   ci->current.duration = duration.tv_sec * 1000 + duration.tv_usec / 1000;
643
644   /* Only set out stats/log if someone has actually performed a check */
645   if(ci->current.state != NP_UNKNOWN ||
646      ci->current.available != NP_UNKNOWN)
647     noit_check_set_stats(self, check, &ci->current);
648   free(ci->current.status);
649 }
650 int
651 noit_lua_yield(noit_lua_check_info_t *ci, int nargs) {
652   noitL(nldeb, "lua: %p yielding\n", ci->coro_state);
653   return lua_yield(ci->coro_state, nargs);
654 }
655 int
656 noit_lua_resume(noit_lua_check_info_t *ci, int nargs) {
657   int result = -1, base;
658   noit_module_t *self;
659   noit_check_t *check;
660
661   noitL(nldeb, "lua: %p resuming(%d)\n", ci->coro_state, nargs);
662   result = lua_resume(ci->coro_state, nargs);
663   switch(result) {
664     case 0: /* success */
665       break;
666     case LUA_YIELD: /* The complicated case */
667       /* The person yielding had better setup an event
668        * to wake up the coro...
669        */
670       lua_gc(ci->lmc->lua_state, LUA_GCCOLLECT, 0);
671       goto done;
672     default: /* Errors */
673       noitL(nldeb, "lua resume returned: %d\n", result);
674       ci->current.status = strdup(ci->timed_out ? "timeout" : "unknown error");
675       ci->current.available = NP_UNAVAILABLE;
676       ci->current.state = NP_BAD;
677       base = lua_gettop(ci->coro_state);
678       if(base>0) {
679         if(lua_isstring(ci->coro_state, base)) {
680           const char *err, *nerr;
681           err = lua_tostring(ci->coro_state, base);
682           nerr = lua_tostring(ci->coro_state, base - 2);
683           if(err) noitL(nldeb, "err -> %s\n", err);
684           if(nerr) noitL(nldeb, "nerr -> %s\n", nerr);
685           if(nerr && *nerr == 31) nerr = NULL; // 31? WTF lua?
686           if(!nerr && err) {
687             nerr = strchr(err, ' '); /* advance past the file */
688             if(nerr) nerr += 1;
689           }
690           if(nerr) {
691             free(ci->current.status);
692             ci->current.status = strdup(nerr);
693           }
694         }
695       }
696       break;
697   }
698
699   self = ci->self;
700   check = ci->check;
701   cancel_coro(ci);
702   noit_lua_log_results(self, check);
703   noit_lua_module_cleanup(self, check);
704   ci = NULL; /* we freed it... explode if someone uses it before we return */
705   check->flags &= ~NP_RUNNING;
706
707  done:
708   return result;
709 }
710 static int
711 noit_lua_check_timeout(eventer_t e, int mask, void *closure,
712                        struct timeval *now) {
713   noit_module_t *self;
714   noit_check_t *check;
715   struct nl_intcl *int_cl = closure;
716   noit_lua_check_info_t *ci = int_cl->ci;
717   noitL(nldeb, "lua: %p ->check_timeout\n", ci->coro_state);
718   ci->timed_out = 1;
719   noit_lua_check_deregister_event(ci, e, 0);
720
721   self = ci->self;
722   check = ci->check;
723
724   if(ci->coro_state) {
725     /* Our coro is still "in-flight". To fix this we will unreference
726      * it, garbage collect it and then ensure that it failes a resume
727      */
728     cancel_coro(ci);
729   }
730   ci->current.status = strdup("timeout");
731   ci->current.available = NP_UNAVAILABLE;
732   ci->current.state = NP_BAD;
733
734   noit_lua_log_results(self, check);
735   noit_lua_module_cleanup(self, check);
736   check->flags &= ~NP_RUNNING;
737
738   if(int_cl->free) int_cl->free(int_cl);
739   return 0;
740 }
741 static int
742 noit_lua_initiate(noit_module_t *self, noit_check_t *check,
743                   noit_check_t *cause) {
744   LMC_DECL(L, self);
745   struct nl_intcl *int_cl;
746   noit_lua_check_info_t *ci;
747   struct timeval p_int, __now;
748   eventer_t e;
749
750   if(!check->closure) check->closure = calloc(1, sizeof(noit_lua_check_info_t));
751   ci = check->closure;
752
753   /* We cannot be running */
754   assert(!(check->flags & NP_RUNNING));
755   check->flags |= NP_RUNNING;
756
757   ci->self = self;
758   ci->check = check;
759   ci->cause = cause;
760   noit_check_stats_clear(&ci->current);
761
762   gettimeofday(&__now, NULL);
763   memcpy(&check->last_fire_time, &__now, sizeof(__now));
764
765   e = eventer_alloc();
766   e->mask = EVENTER_TIMER;
767   e->callback = noit_lua_check_timeout;
768   /* We wrap this in an alloc so we can blindly free it later */
769   int_cl = calloc(1, sizeof(*int_cl));
770   int_cl->ci = ci;
771   int_cl->free = int_cl_free;
772   e->closure = int_cl;
773   memcpy(&e->whence, &__now, sizeof(__now));
774   p_int.tv_sec = check->timeout / 1000;
775   p_int.tv_usec = (check->timeout % 1000) * 1000;
776   add_timeval(e->whence, p_int, &e->whence);
777   noit_lua_check_register_event(ci, e);
778   eventer_add(e);
779
780   ci->lmc = lmc;
781   lua_getglobal(L, "noit_coros");
782   ci->coro_state = lua_newthread(L);
783   ci->coro_state_ref = luaL_ref(L, -2);
784   lua_pop(L, 1); /* pops noit_coros */
785   noit_hash_store(&noit_coros,
786                   (const char *)&ci->coro_state, sizeof(ci->coro_state),
787                   ci);
788
789   SETUP_CALL(ci->coro_state, "initiate", goto fail);
790   noit_lua_setup_module(ci->coro_state, ci->self);
791   noit_lua_setup_check(ci->coro_state, ci->check);
792   if(cause)
793     noit_lua_setup_check(ci->coro_state, ci->cause);
794   else
795     lua_pushnil(ci->coro_state);
796   noit_lua_resume(ci, 3);
797   return 0;
798
799  fail:
800   noit_lua_log_results(ci->self, ci->check);
801   noit_lua_module_cleanup(ci->self, ci->check);
802   check->flags &= ~NP_RUNNING;
803   return -1;
804 }
805 /* This is the standard wrapper */
806 static int
807 noit_lua_module_initiate_check(noit_module_t *self, noit_check_t *check,
808                                int once, noit_check_t *cause) {
809   if(!check->closure) check->closure = calloc(1, sizeof(noit_lua_check_info_t));
810   INITIATE_CHECK(noit_lua_initiate, self, check, cause);
811   return 0;
812 }
813 static int noit_lua_panic(lua_State *L) {
814   assert(L == NULL);
815   return 0;
816 }
817 static noit_module_t *
818 noit_lua_loader_load(noit_module_loader_t *loader,
819                      char *module_name,
820                      noit_conf_section_t section) {
821   int rv;
822   noit_module_t *m;
823   lua_State *L;
824   lua_module_closure_t *lmc;
825   char *object;
826  
827   noitL(nldeb, "Loading lua module: %s\n", module_name);
828   if(noit_conf_get_string(section, "@object", &object) == 0) {
829     noitL(nlerr, "Lua module %s require object attribute.\n", module_name);
830     return NULL;
831   }
832
833   m = noit_blank_module();
834   m->hdr.magic = NOIT_MODULE_MAGIC;
835   m->hdr.version = NOIT_MODULE_ABI_VERSION;
836   m->hdr.name = strdup(module_name);
837   m->hdr.description = strdup("Lua module");
838   m->hdr.onload = noit_lua_module_onload;
839   lmc = calloc(1, sizeof(*lmc));
840   lmc->object = object;
841
842   L = lmc->lua_state = lua_open();
843   lua_atpanic(L, &noit_lua_panic);
844
845   lua_gc(L, LUA_GCSTOP, 0);  /* stop collector during initialization */
846   luaL_openlibs(L);  /* open libraries */
847   luaopen_pack(L);
848   luaopen_noit(L);
849
850   lua_newtable(L);
851   lua_setglobal(L, "noit_coros");
852
853   lua_getfield(L, LUA_GLOBALSINDEX, "package");
854   lua_pushfstring(L, "%s", noit_lua_loader_get_directory(loader));
855   lua_setfield(L, -2, "path");
856   lua_pop(L, 1);
857
858 #define require(a) do { \
859   lua_getglobal(L, "require"); \
860   lua_pushstring(L, #a); \
861   rv = lua_pcall(L, 1, 1, 0); \
862   if(rv != 0) { \
863     noitL(noit_stderr, "Loading: %d\n", rv); \
864     goto load_failed; \
865   } \
866   lua_pop(L, 1); \
867 } while(0)
868
869   require(noit.timeval);
870
871   lua_gc(L, LUA_GCRESTART, 0);
872
873   noit_image_set_userdata(&m->hdr, lmc);
874   if(m->hdr.onload(&m->hdr) == -1) {
875    load_failed:
876     lua_close(L);
877     free(m->hdr.name);
878     free(m->hdr.description);
879     free(lmc->object);
880     free(lmc);
881     /* FIXME: We leak the opaque_handler in the module here... */
882     free(m);
883     return NULL;
884   }
885
886   m->config = noit_lua_module_config;
887   m->init = noit_lua_module_init;
888   m->initiate_check = noit_lua_module_initiate_check;
889   m->cleanup = noit_lua_module_cleanup;
890
891   noit_register_module(m);
892   return m;
893 }
894
895 static int
896 noit_lua_loader_config(noit_module_loader_t *self, noit_hash_table *o) {
897   const char *dir = ".";
898   noit_hash_retr_str(o, "directory", strlen("directory"), &dir);
899   noit_lua_loader_set_directory(self, dir);
900   return 0;
901 }
902 static int
903 noit_lua_loader_onload(noit_image_t *self) {
904   nlerr = noit_log_stream_find("error/lua");
905   nldeb = noit_log_stream_find("debug/lua");
906   if(!nlerr) nlerr = noit_stderr;
907   if(!nldeb) nldeb = noit_debug;
908   eventer_name_callback("lua/check_timeout", noit_lua_check_timeout);
909   return 0;
910 }
911
912 #include "lua.xmlh"
913 noit_module_loader_t lua = {
914   {
915     NOIT_LOADER_MAGIC,
916     NOIT_LOADER_ABI_VERSION,
917     "lua",
918     "Lua check loader",
919     lua_xml_description,
920     noit_lua_loader_onload,
921   },
922   noit_lua_loader_config,
923   NULL,
924   noit_lua_loader_load
925 };
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