824aa2592245f83933967e125c280f22583e4b81
1 /**
2 * collectd - src/python.c
3 * Copyright (C) 2009 Sven Trenkel
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Sven Trenkel <collectd at semidefinite.de>
25 **/
27 #include <Python.h>
28 #include <structmember.h>
30 #include <signal.h>
31 #if HAVE_PTHREAD_H
32 # include <pthread.h>
33 #endif
35 #include "collectd.h"
36 #include "common.h"
38 #include "cpython.h"
40 typedef struct cpy_callback_s {
41 char *name;
42 PyObject *callback;
43 PyObject *data;
44 struct cpy_callback_s *next;
45 } cpy_callback_t;
47 static char log_doc[] = "This function sends a string to all logging plugins.";
49 static char flush_doc[] = "flush([plugin][, timeout][, identifier]) -> None\n"
50 "\n"
51 "Flushes the cache of another plugin.";
53 static char unregister_doc[] = "Unregisters a callback. This function needs exactly one parameter either\n"
54 "the function to unregister or the callback identifier to unregister.";
56 static char reg_log_doc[] = "register_log(callback[, data][, name]) -> identifier\n"
57 "\n"
58 "Register a callback function for log messages.\n"
59 "\n"
60 "'callback' is a callable object that will be called every time something\n"
61 " is logged.\n"
62 "'data' is an optional object that will be passed back to the callback\n"
63 " function every time it is called.\n"
64 "'name' is an optional identifier for this callback. The default name\n"
65 " is 'python.<module>'.\n"
66 " Every callback needs a unique identifier, so if you want to\n"
67 " register this callback multiple time from the same module you need\n"
68 " to specify a name here.\n"
69 "'identifier' is the full identifier assigned to this callback.\n"
70 "\n"
71 "The callback function will be called with two or three parameters:\n"
72 "severity: An integer that should be compared to the LOG_ constants.\n"
73 "message: The text to be logged.\n"
74 "data: The optional data parameter passed to the register function.\n"
75 " If the parameter was omitted it will be omitted here, too.";
77 static char reg_init_doc[] = "register_init(callback[, data][, name]) -> identifier\n"
78 "\n"
79 "Register a callback function that will be executed once after the config.\n"
80 "file has been read, all plugins heve been loaded and the collectd has\n"
81 "forked into the background.\n"
82 "\n"
83 "'callback' is a callable object that will be executed.\n"
84 "'data' is an optional object that will be passed back to the callback\n"
85 " function when it is called.\n"
86 "'name' is an optional identifier for this callback. The default name\n"
87 " is 'python.<module>'.\n"
88 " Every callback needs a unique identifier, so if you want to\n"
89 " register this callback multiple time from the same module you need\n"
90 " to specify a name here.\n"
91 "'identifier' is the full identifier assigned to this callback.\n"
92 "\n"
93 "The callback function will be called without parameters, except for\n"
94 "data if it was supplied.";
96 static char reg_config_doc[] = "register_config(callback[, data][, name]) -> identifier\n"
97 "\n"
98 "Register a callback function for config file entries.\n"
99 "'callback' is a callable object that will be called for every config block.\n"
100 "'data' is an optional object that will be passed back to the callback\n"
101 " function every time it is called.\n"
102 "'name' is an optional identifier for this callback. The default name\n"
103 " is 'python.<module>'.\n"
104 " Every callback needs a unique identifier, so if you want to\n"
105 " register this callback multiple time from the same module you need\n"
106 " to specify a name here.\n"
107 "'identifier' is the full identifier assigned to this callback.\n"
108 "\n"
109 "The callback function will be called with one or two parameters:\n"
110 "config: A Config object.\n"
111 "data: The optional data parameter passed to the register function.\n"
112 " If the parameter was omitted it will be omitted here, too.";
114 static char reg_read_doc[] = "register_read(callback[, interval][, data][, name]) -> identifier\n"
115 "\n"
116 "Register a callback function for reading data. It will just be called\n"
117 "in a fixed interval to signal that it's time to dispatch new values.\n"
118 "'callback' is a callable object that will be called every time something\n"
119 " is logged.\n"
120 "'interval' is the number of seconds between between calls to the callback\n"
121 " function. Full float precision is supported here.\n"
122 "'data' is an optional object that will be passed back to the callback\n"
123 " function every time it is called.\n"
124 "'name' is an optional identifier for this callback. The default name\n"
125 " is 'python.<module>'.\n"
126 " Every callback needs a unique identifier, so if you want to\n"
127 " register this callback multiple time from the same module you need\n"
128 " to specify a name here.\n"
129 "'identifier' is the full identifier assigned to this callback.\n"
130 "\n"
131 "The callback function will be called without parameters, except for\n"
132 "data if it was supplied.";
134 static char reg_write_doc[] = "register_write(callback[, data][, name]) -> identifier\n"
135 "\n"
136 "Register a callback function to receive values dispatched by other plugins.\n"
137 "'callback' is a callable object that will be called every time a value\n"
138 " is dispatched.\n"
139 "'data' is an optional object that will be passed back to the callback\n"
140 " function every time it is called.\n"
141 "'name' is an optional identifier for this callback. The default name\n"
142 " is 'python.<module>'.\n"
143 " Every callback needs a unique identifier, so if you want to\n"
144 " register this callback multiple time from the same module you need\n"
145 " to specify a name here.\n"
146 "'identifier' is the full identifier assigned to this callback.\n"
147 "\n"
148 "The callback function will be called with one or two parameters:\n"
149 "values: A Values object which is a copy of the dispatched values.\n"
150 "data: The optional data parameter passed to the register function.\n"
151 " If the parameter was omitted it will be omitted here, too.";
153 static char reg_notification_doc[] = "register_notification(callback[, data][, name]) -> identifier\n"
154 "\n"
155 "Register a callback function for notifications.\n"
156 "'callback' is a callable object that will be called every time a notification\n"
157 " is dispatched.\n"
158 "'data' is an optional object that will be passed back to the callback\n"
159 " function every time it is called.\n"
160 "'name' is an optional identifier for this callback. The default name\n"
161 " is 'python.<module>'.\n"
162 " Every callback needs a unique identifier, so if you want to\n"
163 " register this callback multiple time from the same module you need\n"
164 " to specify a name here.\n"
165 "'identifier' is the full identifier assigned to this callback.\n"
166 "\n"
167 "The callback function will be called with one or two parameters:\n"
168 "notification: A copy of the notification that was dispatched.\n"
169 "data: The optional data parameter passed to the register function.\n"
170 " If the parameter was omitted it will be omitted here, too.";
172 static char reg_flush_doc[] = "register_flush(callback[, data][, name]) -> identifier\n"
173 "\n"
174 "Register a callback function for flush messages.\n"
175 "'callback' is a callable object that will be called every time a plugin\n"
176 " requests a flush for either this or all plugins.\n"
177 "'data' is an optional object that will be passed back to the callback\n"
178 " function every time it is called.\n"
179 "'name' is an optional identifier for this callback. The default name\n"
180 " is 'python.<module>'.\n"
181 " Every callback needs a unique identifier, so if you want to\n"
182 " register this callback multiple time from the same module you need\n"
183 " to specify a name here.\n"
184 "'identifier' is the full identifier assigned to this callback.\n"
185 "\n"
186 "The callback function will be called with two or three parameters:\n"
187 "timeout: Indicates that only data older than 'timeout' seconds is to\n"
188 " be flushed.\n"
189 "id: Specifies which values are to be flushed.\n"
190 "data: The optional data parameter passed to the register function.\n"
191 " If the parameter was omitted it will be omitted here, too.";
193 static char reg_shutdown_doc[] = "register_shutdown(callback[, data][, name]) -> identifier\n"
194 "\n"
195 "Register a callback function for collectd shutdown.\n"
196 "'callback' is a callable object that will be called once collectd is\n"
197 " shutting down.\n"
198 "'data' is an optional object that will be passed back to the callback\n"
199 " function if it is called.\n"
200 "'name' is an optional identifier for this callback. The default name\n"
201 " is 'python.<module>'.\n"
202 " Every callback needs a unique identifier, so if you want to\n"
203 " register this callback multiple time from the same module you need\n"
204 " to specify a name here.\n"
205 "'identifier' is the full identifier assigned to this callback.\n"
206 "\n"
207 "The callback function will be called with no parameters except for\n"
208 " data if it was supplied.";
211 static int do_interactive = 0;
213 /* This is our global thread state. Python saves some stuff in thread-local
214 * storage. So if we allow the interpreter to run in the background
215 * (the scriptwriters might have created some threads from python), we have
216 * to save the state so we can resume it later after shutdown. */
218 static PyThreadState *state;
220 static PyObject *cpy_format_exception;
222 static cpy_callback_t *cpy_config_callbacks;
223 static cpy_callback_t *cpy_init_callbacks;
224 static cpy_callback_t *cpy_shutdown_callbacks;
226 static void cpy_destroy_user_data(void *data) {
227 cpy_callback_t *c = data;
228 free(c->name);
229 Py_DECREF(c->callback);
230 Py_XDECREF(c->data);
231 free(c);
232 }
234 /* You must hold the GIL to call this function!
235 * But if you managed to extract the callback parameter then you probably already do. */
237 static void cpy_build_name(char *buf, size_t size, PyObject *callback, const char *name) {
238 const char *module = NULL;
239 PyObject *mod = NULL;
241 if (name != NULL) {
242 snprintf(buf, size, "python.%s", name);
243 return;
244 }
246 mod = PyObject_GetAttrString(callback, "__module__"); /* New reference. */
247 if (mod != NULL)
248 module = cpy_unicode_or_bytes_to_string(&mod);
250 if (module != NULL) {
251 snprintf(buf, size, "python.%s", module);
252 Py_XDECREF(mod);
253 PyErr_Clear();
254 return;
255 }
256 Py_XDECREF(mod);
258 snprintf(buf, size, "python.%p", callback);
259 PyErr_Clear();
260 }
262 static void cpy_log_exception(const char *context) {
263 int l = 0, i;
264 const char *typename = NULL, *message = NULL;
265 PyObject *type, *value, *traceback, *tn, *m, *list;
267 PyErr_Fetch(&type, &value, &traceback);
268 PyErr_NormalizeException(&type, &value, &traceback);
269 if (type == NULL) return;
270 tn = PyObject_GetAttrString(type, "__name__"); /* New reference. */
271 m = PyObject_Str(value); /* New reference. */
272 if (tn != NULL)
273 typename = cpy_unicode_or_bytes_to_string(&tn);
274 if (m != NULL)
275 message = cpy_unicode_or_bytes_to_string(&m);
276 if (typename == NULL)
277 typename = "NamelessException";
278 if (message == NULL)
279 message = "N/A";
280 Py_BEGIN_ALLOW_THREADS
281 ERROR("Unhandled python exception in %s: %s: %s", context, typename, message);
282 Py_END_ALLOW_THREADS
283 Py_XDECREF(tn);
284 Py_XDECREF(m);
285 if (!cpy_format_exception) {
286 PyErr_Clear();
287 Py_XDECREF(type);
288 Py_XDECREF(value);
289 Py_XDECREF(traceback);
290 return;
291 }
292 if (!traceback) {
293 PyErr_Clear();
294 return;
295 }
296 list = PyObject_CallFunction(cpy_format_exception, "NNN", type, value, traceback); /* New reference. */
297 if (list)
298 l = PyObject_Length(list);
299 for (i = 0; i < l; ++i) {
300 char *s;
301 PyObject *line;
303 line = PyList_GET_ITEM(list, i); /* Borrowed reference. */
304 Py_INCREF(line);
305 s = strdup(cpy_unicode_or_bytes_to_string(&line));
306 Py_DECREF(line);
307 if (s[strlen(s) - 1] == '\n')
308 s[strlen(s) - 1] = 0;
309 Py_BEGIN_ALLOW_THREADS
310 ERROR("%s", s);
311 Py_END_ALLOW_THREADS
312 free(s);
313 }
314 Py_XDECREF(list);
315 PyErr_Clear();
316 }
318 static int cpy_read_callback(user_data_t *data) {
319 cpy_callback_t *c = data->data;
320 PyObject *ret;
322 CPY_LOCK_THREADS
323 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
324 if (ret == NULL) {
325 cpy_log_exception("read callback");
326 } else {
327 Py_DECREF(ret);
328 }
329 CPY_RELEASE_THREADS
330 if (ret == NULL)
331 return 1;
332 return 0;
333 }
335 static int cpy_write_callback(const data_set_t *ds, const value_list_t *value_list, user_data_t *data) {
336 int i;
337 cpy_callback_t *c = data->data;
338 PyObject *ret, *list;
339 Values *v;
341 CPY_LOCK_THREADS
342 list = PyList_New(value_list->values_len); /* New reference. */
343 if (list == NULL) {
344 cpy_log_exception("write callback");
345 CPY_RETURN_FROM_THREADS 0;
346 }
347 for (i = 0; i < value_list->values_len; ++i) {
348 if (ds->ds->type == DS_TYPE_COUNTER) {
349 if ((long) value_list->values[i].counter == value_list->values[i].counter)
350 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].counter));
351 else
352 PyList_SetItem(list, i, PyLong_FromUnsignedLongLong(value_list->values[i].counter));
353 } else if (ds->ds->type == DS_TYPE_GAUGE) {
354 PyList_SetItem(list, i, PyFloat_FromDouble(value_list->values[i].gauge));
355 } else if (ds->ds->type == DS_TYPE_DERIVE) {
356 if ((long) value_list->values[i].derive == value_list->values[i].derive)
357 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].derive));
358 else
359 PyList_SetItem(list, i, PyLong_FromLongLong(value_list->values[i].derive));
360 } else if (ds->ds->type == DS_TYPE_ABSOLUTE) {
361 if ((long) value_list->values[i].absolute == value_list->values[i].absolute)
362 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].absolute));
363 else
364 PyList_SetItem(list, i, PyLong_FromUnsignedLongLong(value_list->values[i].absolute));
365 } else {
366 Py_BEGIN_ALLOW_THREADS
367 ERROR("cpy_write_callback: Unknown value type %d.", ds->ds->type);
368 Py_END_ALLOW_THREADS
369 Py_DECREF(list);
370 CPY_RETURN_FROM_THREADS 0;
371 }
372 if (PyErr_Occurred() != NULL) {
373 cpy_log_exception("value building for write callback");
374 CPY_RETURN_FROM_THREADS 0;
375 }
376 }
377 v = PyObject_New(Values, (void *) &ValuesType);
378 sstrncpy(v->data.host, value_list->host, sizeof(v->data.host));
379 sstrncpy(v->data.type, value_list->type, sizeof(v->data.type));
380 sstrncpy(v->data.type_instance, value_list->type_instance, sizeof(v->data.type_instance));
381 sstrncpy(v->data.plugin, value_list->plugin, sizeof(v->data.plugin));
382 sstrncpy(v->data.plugin_instance, value_list->plugin_instance, sizeof(v->data.plugin_instance));
383 v->data.time = value_list->time;
384 v->interval = value_list->interval;
385 v->values = list;
386 ret = PyObject_CallFunctionObjArgs(c->callback, v, c->data, (void *) 0); /* New reference. */
387 if (ret == NULL) {
388 cpy_log_exception("write callback");
389 } else {
390 Py_DECREF(ret);
391 }
392 CPY_RELEASE_THREADS
393 return 0;
394 }
396 static int cpy_notification_callback(const notification_t *notification, user_data_t *data) {
397 cpy_callback_t *c = data->data;
398 PyObject *ret;
399 Notification *n;
401 CPY_LOCK_THREADS
402 n = PyObject_New(Notification, (void *) &NotificationType);
403 sstrncpy(n->data.host, notification->host, sizeof(n->data.host));
404 sstrncpy(n->data.type, notification->type, sizeof(n->data.type));
405 sstrncpy(n->data.type_instance, notification->type_instance, sizeof(n->data.type_instance));
406 sstrncpy(n->data.plugin, notification->plugin, sizeof(n->data.plugin));
407 sstrncpy(n->data.plugin_instance, notification->plugin_instance, sizeof(n->data.plugin_instance));
408 n->data.time = notification->time;
409 sstrncpy(n->message, notification->message, sizeof(n->message));
410 n->severity = notification->severity;
411 ret = PyObject_CallFunctionObjArgs(c->callback, n, c->data, (void *) 0); /* New reference. */
412 if (ret == NULL) {
413 cpy_log_exception("notification callback");
414 } else {
415 Py_DECREF(ret);
416 }
417 CPY_RELEASE_THREADS
418 return 0;
419 }
421 static void cpy_log_callback(int severity, const char *message, user_data_t *data) {
422 cpy_callback_t * c = data->data;
423 PyObject *ret;
425 CPY_LOCK_THREADS
426 if (c->data == NULL)
427 ret = PyObject_CallFunction(c->callback, "is", severity, message); /* New reference. */
428 else
429 ret = PyObject_CallFunction(c->callback, "isO", severity, message, c->data); /* New reference. */
431 if (ret == NULL) {
432 /* FIXME */
433 /* Do we really want to trigger a log callback because a log callback failed?
434 * Probably not. */
435 PyErr_Print();
436 /* In case someone wanted to be clever, replaced stderr and failed at that. */
437 PyErr_Clear();
438 } else {
439 Py_DECREF(ret);
440 }
441 CPY_RELEASE_THREADS
442 }
444 static void cpy_flush_callback(int timeout, const char *id, user_data_t *data) {
445 cpy_callback_t * c = data->data;
446 PyObject *ret;
448 CPY_LOCK_THREADS
449 if (c->data == NULL)
450 ret = PyObject_CallFunction(c->callback, "is", timeout, id); /* New reference. */
451 else
452 ret = PyObject_CallFunction(c->callback, "isO", timeout, id, c->data); /* New reference. */
454 if (ret == NULL) {
455 cpy_log_exception("flush callback");
456 } else {
457 Py_DECREF(ret);
458 }
459 CPY_RELEASE_THREADS
460 }
462 static PyObject *cpy_register_generic(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
463 char buf[512];
464 cpy_callback_t *c;
465 const char *name = NULL;
466 PyObject *callback = NULL, *data = NULL, *mod = NULL;
467 static char *kwlist[] = {"callback", "data", "name", NULL};
469 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oet", kwlist, &callback, &data, NULL, &name) == 0) return NULL;
470 if (PyCallable_Check(callback) == 0) {
471 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
472 return NULL;
473 }
474 cpy_build_name(buf, sizeof(buf), callback, name);
476 Py_INCREF(callback);
477 Py_XINCREF(data);
478 c = malloc(sizeof(*c));
479 c->name = strdup(buf);
480 c->callback = callback;
481 c->data = data;
482 c->next = *list_head;
483 *list_head = c;
484 Py_XDECREF(mod);
485 return cpy_string_to_unicode_or_bytes(buf);
486 }
488 static PyObject *cpy_flush(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
489 int timeout = -1;
490 const char *plugin = NULL, *identifier = NULL;
491 static char *kwlist[] = {"plugin", "timeout", "identifier", NULL};
493 if (PyArg_ParseTupleAndKeywords(args, kwds, "|etiet", kwlist, NULL, &plugin, &timeout, NULL, &identifier) == 0) return NULL;
494 Py_BEGIN_ALLOW_THREADS
495 plugin_flush(plugin, timeout, identifier);
496 Py_END_ALLOW_THREADS
497 Py_RETURN_NONE;
498 }
500 static PyObject *cpy_register_config(PyObject *self, PyObject *args, PyObject *kwds) {
501 return cpy_register_generic(&cpy_config_callbacks, args, kwds);
502 }
504 static PyObject *cpy_register_init(PyObject *self, PyObject *args, PyObject *kwds) {
505 return cpy_register_generic(&cpy_init_callbacks, args, kwds);
506 }
508 typedef int reg_function_t(const char *name, void *callback, void *data);
510 static PyObject *cpy_register_generic_userdata(void *reg, void *handler, PyObject *args, PyObject *kwds) {
511 char buf[512];
512 reg_function_t *register_function = (reg_function_t *) reg;
513 cpy_callback_t *c = NULL;
514 user_data_t *user_data = NULL;
515 const char *name = NULL;
516 PyObject *callback = NULL, *data = NULL;
517 static char *kwlist[] = {"callback", "data", "name", NULL};
519 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oet", kwlist, &callback, &data, NULL, &name) == 0) return NULL;
520 if (PyCallable_Check(callback) == 0) {
521 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
522 return NULL;
523 }
524 cpy_build_name(buf, sizeof(buf), callback, name);
526 Py_INCREF(callback);
527 Py_XINCREF(data);
528 c = malloc(sizeof(*c));
529 c->name = strdup(buf);
530 c->callback = callback;
531 c->data = data;
532 c->next = NULL;
533 user_data = malloc(sizeof(*user_data));
534 user_data->free_func = cpy_destroy_user_data;
535 user_data->data = c;
536 register_function(buf, handler, user_data);
537 return cpy_string_to_unicode_or_bytes(buf);
538 }
540 static PyObject *cpy_register_read(PyObject *self, PyObject *args, PyObject *kwds) {
541 char buf[512];
542 cpy_callback_t *c = NULL;
543 user_data_t *user_data = NULL;
544 double interval = 0;
545 const char *name = NULL;
546 PyObject *callback = NULL, *data = NULL;
547 struct timespec ts;
548 static char *kwlist[] = {"callback", "interval", "data", "name", NULL};
550 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|dOet", kwlist, &callback, &interval, &data, NULL, &name) == 0) return NULL;
551 if (PyCallable_Check(callback) == 0) {
552 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
553 return NULL;
554 }
555 cpy_build_name(buf, sizeof(buf), callback, name);
557 Py_INCREF(callback);
558 Py_XINCREF(data);
559 c = malloc(sizeof(*c));
560 c->name = strdup(buf);
561 c->callback = callback;
562 c->data = data;
563 c->next = NULL;
564 user_data = malloc(sizeof(*user_data));
565 user_data->free_func = cpy_destroy_user_data;
566 user_data->data = c;
567 ts.tv_sec = interval;
568 ts.tv_nsec = (interval - ts.tv_sec) * 1000000000;
569 plugin_register_complex_read(buf, cpy_read_callback, &ts, user_data);
570 return cpy_string_to_unicode_or_bytes(buf);
571 }
573 static PyObject *cpy_register_log(PyObject *self, PyObject *args, PyObject *kwds) {
574 return cpy_register_generic_userdata((void *) plugin_register_log,
575 (void *) cpy_log_callback, args, kwds);
576 }
578 static PyObject *cpy_register_write(PyObject *self, PyObject *args, PyObject *kwds) {
579 return cpy_register_generic_userdata((void *) plugin_register_write,
580 (void *) cpy_write_callback, args, kwds);
581 }
583 static PyObject *cpy_register_notification(PyObject *self, PyObject *args, PyObject *kwds) {
584 return cpy_register_generic_userdata((void *) plugin_register_notification,
585 (void *) cpy_notification_callback, args, kwds);
586 }
588 static PyObject *cpy_register_flush(PyObject *self, PyObject *args, PyObject *kwds) {
589 return cpy_register_generic_userdata((void *) plugin_register_flush,
590 (void *) cpy_flush_callback, args, kwds);
591 }
593 static PyObject *cpy_register_shutdown(PyObject *self, PyObject *args, PyObject *kwds) {
594 return cpy_register_generic(&cpy_shutdown_callbacks, args, kwds);
595 }
597 static PyObject *cpy_error(PyObject *self, PyObject *args) {
598 const char *text;
599 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
600 Py_BEGIN_ALLOW_THREADS
601 plugin_log(LOG_ERR, "%s", text);
602 Py_END_ALLOW_THREADS
603 Py_RETURN_NONE;
604 }
606 static PyObject *cpy_warning(PyObject *self, PyObject *args) {
607 const char *text;
608 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
609 Py_BEGIN_ALLOW_THREADS
610 plugin_log(LOG_WARNING, "%s", text);
611 Py_END_ALLOW_THREADS
612 Py_RETURN_NONE;
613 }
615 static PyObject *cpy_notice(PyObject *self, PyObject *args) {
616 const char *text;
617 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
618 Py_BEGIN_ALLOW_THREADS
619 plugin_log(LOG_NOTICE, "%s", text);
620 Py_END_ALLOW_THREADS
621 Py_RETURN_NONE;
622 }
624 static PyObject *cpy_info(PyObject *self, PyObject *args) {
625 const char *text;
626 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
627 Py_BEGIN_ALLOW_THREADS
628 plugin_log(LOG_INFO, "%s", text);
629 Py_END_ALLOW_THREADS
630 Py_RETURN_NONE;
631 }
633 static PyObject *cpy_debug(PyObject *self, PyObject *args) {
634 #ifdef COLLECT_DEBUG
635 const char *text;
636 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
637 Py_BEGIN_ALLOW_THREADS
638 plugin_log(LOG_DEBUG, "%s", text);
639 Py_END_ALLOW_THREADS
640 #endif
641 Py_RETURN_NONE;
642 }
644 static PyObject *cpy_unregister_generic(cpy_callback_t **list_head, PyObject *arg, const char *desc) {
645 char buf[512];
646 const char *name;
647 cpy_callback_t *prev = NULL, *tmp;
649 Py_INCREF(arg);
650 name = cpy_unicode_or_bytes_to_string(&arg);
651 if (name == NULL) {
652 PyErr_Clear();
653 if (!PyCallable_Check(arg)) {
654 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
655 Py_DECREF(arg);
656 return NULL;
657 }
658 cpy_build_name(buf, sizeof(buf), arg, NULL);
659 name = buf;
660 }
661 for (tmp = *list_head; tmp; prev = tmp, tmp = tmp->next)
662 if (strcmp(name, tmp->name) == 0)
663 break;
665 Py_DECREF(arg);
666 if (tmp == NULL) {
667 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
668 return NULL;
669 }
670 /* Yes, this is actually save. To call this function the caller has to
671 * hold the GIL. Well, save as long as there is only one GIL anyway ... */
672 if (prev == NULL)
673 *list_head = tmp->next;
674 else
675 prev->next = tmp->next;
676 cpy_destroy_user_data(tmp);
677 Py_RETURN_NONE;
678 }
680 typedef int cpy_unregister_function_t(const char *name);
682 static PyObject *cpy_unregister_generic_userdata(cpy_unregister_function_t *unreg, PyObject *arg, const char *desc) {
683 char buf[512];
684 const char *name;
686 Py_INCREF(arg);
687 name = cpy_unicode_or_bytes_to_string(&arg);
688 if (name == NULL) {
689 PyErr_Clear();
690 if (!PyCallable_Check(arg)) {
691 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
692 Py_DECREF(&arg);
693 return NULL;
694 }
695 cpy_build_name(buf, sizeof(buf), arg, NULL);
696 name = buf;
697 }
698 if (unreg(name) == 0) {
699 Py_DECREF(&arg);
700 Py_RETURN_NONE;
701 }
702 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
703 Py_DECREF(&arg);
704 return NULL;
705 }
707 static PyObject *cpy_unregister_log(PyObject *self, PyObject *arg) {
708 return cpy_unregister_generic_userdata(plugin_unregister_log, arg, "log");
709 }
711 static PyObject *cpy_unregister_init(PyObject *self, PyObject *arg) {
712 return cpy_unregister_generic(&cpy_init_callbacks, arg, "init");
713 }
715 static PyObject *cpy_unregister_config(PyObject *self, PyObject *arg) {
716 return cpy_unregister_generic(&cpy_config_callbacks, arg, "config");
717 }
719 static PyObject *cpy_unregister_read(PyObject *self, PyObject *arg) {
720 return cpy_unregister_generic_userdata(plugin_unregister_read, arg, "read");
721 }
723 static PyObject *cpy_unregister_write(PyObject *self, PyObject *arg) {
724 return cpy_unregister_generic_userdata(plugin_unregister_write, arg, "write");
725 }
727 static PyObject *cpy_unregister_notification(PyObject *self, PyObject *arg) {
728 return cpy_unregister_generic_userdata(plugin_unregister_notification, arg, "notification");
729 }
731 static PyObject *cpy_unregister_flush(PyObject *self, PyObject *arg) {
732 return cpy_unregister_generic_userdata(plugin_unregister_flush, arg, "flush");
733 }
735 static PyObject *cpy_unregister_shutdown(PyObject *self, PyObject *arg) {
736 return cpy_unregister_generic(&cpy_shutdown_callbacks, arg, "shutdown");
737 }
739 static PyMethodDef cpy_methods[] = {
740 {"debug", cpy_debug, METH_VARARGS, log_doc},
741 {"info", cpy_info, METH_VARARGS, log_doc},
742 {"notice", cpy_notice, METH_VARARGS, log_doc},
743 {"warning", cpy_warning, METH_VARARGS, log_doc},
744 {"error", cpy_error, METH_VARARGS, log_doc},
745 {"flush", (PyCFunction) cpy_flush, METH_VARARGS | METH_KEYWORDS, flush_doc},
746 {"register_log", (PyCFunction) cpy_register_log, METH_VARARGS | METH_KEYWORDS, reg_log_doc},
747 {"register_init", (PyCFunction) cpy_register_init, METH_VARARGS | METH_KEYWORDS, reg_init_doc},
748 {"register_config", (PyCFunction) cpy_register_config, METH_VARARGS | METH_KEYWORDS, reg_config_doc},
749 {"register_read", (PyCFunction) cpy_register_read, METH_VARARGS | METH_KEYWORDS, reg_read_doc},
750 {"register_write", (PyCFunction) cpy_register_write, METH_VARARGS | METH_KEYWORDS, reg_write_doc},
751 {"register_notification", (PyCFunction) cpy_register_notification, METH_VARARGS | METH_KEYWORDS, reg_notification_doc},
752 {"register_flush", (PyCFunction) cpy_register_flush, METH_VARARGS | METH_KEYWORDS, reg_flush_doc},
753 {"register_shutdown", (PyCFunction) cpy_register_shutdown, METH_VARARGS | METH_KEYWORDS, reg_shutdown_doc},
754 {"unregister_log", cpy_unregister_log, METH_O, unregister_doc},
755 {"unregister_init", cpy_unregister_init, METH_O, unregister_doc},
756 {"unregister_config", cpy_unregister_config, METH_O, unregister_doc},
757 {"unregister_read", cpy_unregister_read, METH_O, unregister_doc},
758 {"unregister_write", cpy_unregister_write, METH_O, unregister_doc},
759 {"unregister_notification", cpy_unregister_notification, METH_O, unregister_doc},
760 {"unregister_flush", cpy_unregister_flush, METH_O, unregister_doc},
761 {"unregister_shutdown", cpy_unregister_shutdown, METH_O, unregister_doc},
762 {0, 0, 0, 0}
763 };
765 static int cpy_shutdown(void) {
766 cpy_callback_t *c;
767 PyObject *ret;
769 /* This can happen if the module was loaded but not configured. */
770 if (state != NULL)
771 PyEval_RestoreThread(state);
773 for (c = cpy_shutdown_callbacks; c; c = c->next) {
774 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
775 if (ret == NULL)
776 cpy_log_exception("shutdown callback");
777 else
778 Py_DECREF(ret);
779 }
780 PyErr_Print();
781 Py_Finalize();
782 return 0;
783 }
785 static void cpy_int_handler(int sig) {
786 return;
787 }
789 static void *cpy_interactive(void *data) {
790 sigset_t sigset;
791 struct sigaction sig_int_action, old;
793 /* Signal handler in a plugin? Bad stuff, but the best way to
794 * handle it I guess. In an interactive session people will
795 * press Ctrl+C at some time, which will generate a SIGINT.
796 * This will cause collectd to shutdown, thus killing the
797 * interactive interpreter, and leaving the terminal in a
798 * mess. Chances are, this isn't what the user wanted to do.
799 *
800 * So this is the plan:
801 * 1. Block SIGINT in the main thread.
802 * 2. Install our own signal handler that does nothing.
803 * 3. Unblock SIGINT in the interactive thread.
804 *
805 * This will make sure that SIGINT won't kill collectd but
806 * still interrupt syscalls like sleep and pause.
807 * It does not raise a KeyboardInterrupt exception because so
808 * far nobody managed to figure out how to do that. */
809 memset (&sig_int_action, '\0', sizeof (sig_int_action));
810 sig_int_action.sa_handler = cpy_int_handler;
811 sigaction (SIGINT, &sig_int_action, &old);
813 sigemptyset(&sigset);
814 sigaddset(&sigset, SIGINT);
815 pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
816 PyEval_AcquireThread(state);
817 if (PyImport_ImportModule("readline") == NULL) {
818 /* This interactive session will suck. */
819 cpy_log_exception("interactive session init");
820 }
821 PyRun_InteractiveLoop(stdin, "<stdin>");
822 PyErr_Print();
823 PyEval_ReleaseThread(state);
824 NOTICE("python: Interactive interpreter exited, stopping collectd ...");
825 /* Restore the original collectd SIGINT handler and raise SIGINT.
826 * The main thread still has SIGINT blocked and there's nothing we
827 * can do about that so this thread will handle it. But that's not
828 * important, except that it won't interrupt the main loop and so
829 * it might take a few seconds before collectd really shuts down. */
830 sigaction (SIGINT, &old, NULL);
831 raise(SIGINT);
832 pause();
833 return NULL;
834 }
836 static int cpy_init(void) {
837 cpy_callback_t *c;
838 PyObject *ret;
839 static pthread_t thread;
840 sigset_t sigset;
842 PyEval_InitThreads();
843 /* Now it's finally OK to use python threads. */
844 for (c = cpy_init_callbacks; c; c = c->next) {
845 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
846 if (ret == NULL)
847 cpy_log_exception("init callback");
848 else
849 Py_DECREF(ret);
850 }
851 sigemptyset(&sigset);
852 sigaddset(&sigset, SIGINT);
853 pthread_sigmask(SIG_BLOCK, &sigset, NULL);
854 state = PyEval_SaveThread();
855 if (do_interactive) {
856 if (pthread_create(&thread, NULL, cpy_interactive, NULL)) {
857 ERROR("python: Error creating thread for interactive interpreter.");
858 }
859 }
861 return 0;
862 }
864 static PyObject *cpy_oconfig_to_pyconfig(oconfig_item_t *ci, PyObject *parent) {
865 int i;
866 PyObject *item, *values, *children, *tmp;
868 if (parent == NULL)
869 parent = Py_None;
871 values = PyTuple_New(ci->values_num); /* New reference. */
872 for (i = 0; i < ci->values_num; ++i) {
873 if (ci->values[i].type == OCONFIG_TYPE_STRING) {
874 PyTuple_SET_ITEM(values, i, cpy_string_to_unicode_or_bytes(ci->values[i].value.string));
875 } else if (ci->values[i].type == OCONFIG_TYPE_NUMBER) {
876 PyTuple_SET_ITEM(values, i, PyFloat_FromDouble(ci->values[i].value.number));
877 } else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN) {
878 PyTuple_SET_ITEM(values, i, PyBool_FromLong(ci->values[i].value.boolean));
879 }
880 }
882 item = PyObject_CallFunction((void *) &ConfigType, "sONO", ci->key, parent, values, Py_None);
883 if (item == NULL)
884 return NULL;
885 children = PyTuple_New(ci->children_num); /* New reference. */
886 for (i = 0; i < ci->children_num; ++i) {
887 PyTuple_SET_ITEM(children, i, cpy_oconfig_to_pyconfig(ci->children + i, item));
888 }
889 tmp = ((Config *) item)->children;
890 ((Config *) item)->children = children;
891 Py_XDECREF(tmp);
892 return item;
893 }
895 static struct PyModuleDef collectdmodule = {
896 PyModuleDef_HEAD_INIT,
897 "collectd", /* name of module */
898 "Where does this go?", /* module documentation, may be NULL */
899 -1,
900 cpy_methods
901 };
903 PyMODINIT_FUNC PyInit_collectd(void) {
904 return PyModule_Create(&collectdmodule);
905 }
907 static int cpy_config(oconfig_item_t *ci) {
908 int i;
909 PyObject *sys, *tb;
910 PyObject *sys_path;
911 PyObject *module;
913 /* Ok in theory we shouldn't do initialization at this point
914 * but we have to. In order to give python scripts a chance
915 * to register a config callback we need to be able to execute
916 * python code during the config callback so we have to start
917 * the interpreter here. */
918 /* Do *not* use the python "thread" module at this point! */
920 #ifdef IS_PY3K
921 /* Add a builtin module, before Py_Initialize */
922 PyImport_AppendInittab("collectd", PyInit_collectd);
923 #endif
925 Py_Initialize();
927 PyType_Ready(&ConfigType);
928 PyType_Ready(&PluginDataType);
929 ValuesType.tp_base = &PluginDataType;
930 PyType_Ready(&ValuesType);
931 NotificationType.tp_base = &PluginDataType;
932 PyType_Ready(&NotificationType);
933 sys = PyImport_ImportModule("sys"); /* New reference. */
934 if (sys == NULL) {
935 cpy_log_exception("python initialization");
936 return 1;
937 }
938 sys_path = PyObject_GetAttrString(sys, "path"); /* New reference. */
939 Py_DECREF(sys);
940 if (sys_path == NULL) {
941 cpy_log_exception("python initialization");
942 return 1;
943 }
944 #ifdef IS_PY3K
945 module = PyImport_ImportModule("collectd");
946 #else
947 module = Py_InitModule("collectd", cpy_methods); /* Borrowed reference. */
948 #endif
949 PyModule_AddObject(module, "Config", (void *) &ConfigType); /* Steals a reference. */
950 PyModule_AddObject(module, "Values", (void *) &ValuesType); /* Steals a reference. */
951 PyModule_AddObject(module, "Notification", (void *) &NotificationType); /* Steals a reference. */
952 PyModule_AddIntConstant(module, "LOG_DEBUG", LOG_DEBUG);
953 PyModule_AddIntConstant(module, "LOG_INFO", LOG_INFO);
954 PyModule_AddIntConstant(module, "LOG_NOTICE", LOG_NOTICE);
955 PyModule_AddIntConstant(module, "LOG_WARNING", LOG_WARNING);
956 PyModule_AddIntConstant(module, "LOG_ERROR", LOG_ERR);
957 PyModule_AddIntConstant(module, "NOTIF_FAILURE", NOTIF_FAILURE);
958 PyModule_AddIntConstant(module, "NOTIF_WARNING", NOTIF_WARNING);
959 PyModule_AddIntConstant(module, "NOTIF_OKAY", NOTIF_OKAY);
960 for (i = 0; i < ci->children_num; ++i) {
961 oconfig_item_t *item = ci->children + i;
963 if (strcasecmp(item->key, "Interactive") == 0) {
964 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
965 continue;
966 do_interactive = item->values[0].value.boolean;
967 } else if (strcasecmp(item->key, "Encoding") == 0) {
968 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_STRING)
969 continue;
970 /* Why is this even necessary? And undocumented? */
971 if (PyUnicode_SetDefaultEncoding(item->values[0].value.string))
972 cpy_log_exception("setting default encoding");
973 } else if (strcasecmp(item->key, "LogTraces") == 0) {
974 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
975 continue;
976 if (!item->values[0].value.boolean) {
977 Py_XDECREF(cpy_format_exception);
978 cpy_format_exception = NULL;
979 continue;
980 }
981 if (cpy_format_exception)
982 continue;
983 tb = PyImport_ImportModule("traceback"); /* New reference. */
984 if (tb == NULL) {
985 cpy_log_exception("python initialization");
986 continue;
987 }
988 cpy_format_exception = PyObject_GetAttrString(tb, "format_exception"); /* New reference. */
989 Py_DECREF(tb);
990 if (cpy_format_exception == NULL)
991 cpy_log_exception("python initialization");
992 } else if (strcasecmp(item->key, "ModulePath") == 0) {
993 char *dir = NULL;
994 PyObject *dir_object;
996 if (cf_util_get_string(item, &dir) != 0)
997 continue;
998 dir_object = cpy_string_to_unicode_or_bytes(dir); /* New reference. */
999 if (dir_object == NULL) {
1000 ERROR("python plugin: Unable to convert \"%s\" to "
1001 "a python object.", dir);
1002 free(dir);
1003 cpy_log_exception("python initialization");
1004 continue;
1005 }
1006 if (PyList_Append(sys_path, dir_object) != 0) {
1007 ERROR("python plugin: Unable to append \"%s\" to "
1008 "python module path.", dir);
1009 cpy_log_exception("python initialization");
1010 }
1011 Py_DECREF(dir_object);
1012 free(dir);
1013 } else if (strcasecmp(item->key, "Import") == 0) {
1014 char *module_name = NULL;
1015 PyObject *module;
1017 if (cf_util_get_string(item, &module_name) != 0)
1018 continue;
1019 module = PyImport_ImportModule(module_name); /* New reference. */
1020 if (module == NULL) {
1021 ERROR("python plugin: Error importing module \"%s\".", module_name);
1022 cpy_log_exception("importing module");
1023 }
1024 free(module_name);
1025 Py_XDECREF(module);
1026 } else if (strcasecmp(item->key, "Module") == 0) {
1027 char *name = NULL;
1028 cpy_callback_t *c;
1029 PyObject *ret;
1031 if (cf_util_get_string(item, &name) != 0)
1032 continue;
1033 for (c = cpy_config_callbacks; c; c = c->next) {
1034 if (strcasecmp(c->name + 7, name) == 0)
1035 break;
1036 }
1037 if (c == NULL) {
1038 WARNING("python plugin: Found a configuration for the \"%s\" plugin, "
1039 "but the plugin isn't loaded or didn't register "
1040 "a configuration callback.", name);
1041 free(name);
1042 continue;
1043 }
1044 free(name);
1045 if (c->data == NULL)
1046 ret = PyObject_CallFunction(c->callback, "N",
1047 cpy_oconfig_to_pyconfig(item, NULL)); /* New reference. */
1048 else
1049 ret = PyObject_CallFunction(c->callback, "NO",
1050 cpy_oconfig_to_pyconfig(item, NULL), c->data); /* New reference. */
1051 if (ret == NULL)
1052 cpy_log_exception("loading module");
1053 else
1054 Py_DECREF(ret);
1055 } else {
1056 WARNING("python plugin: Ignoring unknown config key \"%s\".", item->key);
1057 }
1058 }
1059 Py_DECREF(sys_path);
1060 return 0;
1061 }
1063 void module_register(void) {
1064 plugin_register_complex_config("python", cpy_config);
1065 plugin_register_init("python", cpy_init);
1066 plugin_register_shutdown("python", cpy_shutdown);
1067 }