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 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, *temp, *dict = NULL;
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 dict = PyDict_New();
378 if (value_list->meta) {
379 int i, num;
380 char **table;
381 meta_data_t *meta = value_list->meta;
383 num = meta_data_toc(meta, &table);
384 for (i = 0; i < num; ++i) {
385 int type;
386 char *string;
387 int64_t si;
388 uint64_t ui;
389 double d;
390 _Bool b;
392 type = meta_data_type(meta, table[i]);
393 if (type == MD_TYPE_STRING) {
394 if (meta_data_get_string(meta, table[i], &string))
395 continue;
396 temp = cpy_string_to_unicode_or_bytes(string);
397 free(string);
398 PyDict_SetItemString(dict, table[i], temp);
399 Py_XDECREF(temp);
400 } else if (type == MD_TYPE_SIGNED_INT) {
401 if (meta_data_get_signed_int(meta, table[i], &si))
402 continue;
403 temp = PyObject_CallFunctionObjArgs((void *) &SignedType, PyLong_FromLongLong(si), (void *) 0);
404 PyDict_SetItemString(dict, table[i], temp);
405 Py_XDECREF(temp);
406 } else if (type == MD_TYPE_UNSIGNED_INT) {
407 if (meta_data_get_unsigned_int(meta, table[i], &ui))
408 continue;
409 temp = PyObject_CallFunctionObjArgs((void *) &UnsignedType, PyLong_FromUnsignedLongLong(ui), (void *) 0);
410 PyDict_SetItemString(dict, table[i], temp);
411 Py_XDECREF(temp);
412 } else if (type == MD_TYPE_DOUBLE) {
413 if (meta_data_get_double(meta, table[i], &d))
414 continue;
415 temp = PyFloat_FromDouble(d);
416 PyDict_SetItemString(dict, table[i], temp);
417 Py_XDECREF(temp);
418 } else if (type == MD_TYPE_BOOLEAN) {
419 if (meta_data_get_boolean(meta, table[i], &b))
420 continue;
421 if (b)
422 temp = Py_True;
423 else
424 temp = Py_False;
425 PyDict_SetItemString(dict, table[i], temp);
426 }
427 free(table[i]);
428 }
429 free(table);
430 }
431 v = PyObject_New(Values, (void *) &ValuesType);
432 sstrncpy(v->data.host, value_list->host, sizeof(v->data.host));
433 sstrncpy(v->data.type, value_list->type, sizeof(v->data.type));
434 sstrncpy(v->data.type_instance, value_list->type_instance, sizeof(v->data.type_instance));
435 sstrncpy(v->data.plugin, value_list->plugin, sizeof(v->data.plugin));
436 sstrncpy(v->data.plugin_instance, value_list->plugin_instance, sizeof(v->data.plugin_instance));
437 v->data.time = value_list->time;
438 v->interval = value_list->interval;
439 v->values = list;
440 v->meta = dict;
441 ret = PyObject_CallFunctionObjArgs(c->callback, v, c->data, (void *) 0); /* New reference. */
442 if (ret == NULL) {
443 cpy_log_exception("write callback");
444 } else {
445 Py_DECREF(ret);
446 }
447 CPY_RELEASE_THREADS
448 return 0;
449 }
451 static int cpy_notification_callback(const notification_t *notification, user_data_t *data) {
452 cpy_callback_t *c = data->data;
453 PyObject *ret;
454 Notification *n;
456 CPY_LOCK_THREADS
457 n = PyObject_New(Notification, (void *) &NotificationType);
458 sstrncpy(n->data.host, notification->host, sizeof(n->data.host));
459 sstrncpy(n->data.type, notification->type, sizeof(n->data.type));
460 sstrncpy(n->data.type_instance, notification->type_instance, sizeof(n->data.type_instance));
461 sstrncpy(n->data.plugin, notification->plugin, sizeof(n->data.plugin));
462 sstrncpy(n->data.plugin_instance, notification->plugin_instance, sizeof(n->data.plugin_instance));
463 n->data.time = notification->time;
464 sstrncpy(n->message, notification->message, sizeof(n->message));
465 n->severity = notification->severity;
466 ret = PyObject_CallFunctionObjArgs(c->callback, n, c->data, (void *) 0); /* New reference. */
467 if (ret == NULL) {
468 cpy_log_exception("notification callback");
469 } else {
470 Py_DECREF(ret);
471 }
472 CPY_RELEASE_THREADS
473 return 0;
474 }
476 static void cpy_log_callback(int severity, const char *message, user_data_t *data) {
477 cpy_callback_t * c = data->data;
478 PyObject *ret, *text;
480 CPY_LOCK_THREADS
481 text = cpy_string_to_unicode_or_bytes(message);
482 if (c->data == NULL)
483 ret = PyObject_CallFunction(c->callback, "iN", severity, text); /* New reference. */
484 else
485 ret = PyObject_CallFunction(c->callback, "iNO", severity, text, c->data); /* New reference. */
487 if (ret == NULL) {
488 /* FIXME */
489 /* Do we really want to trigger a log callback because a log callback failed?
490 * Probably not. */
491 PyErr_Print();
492 /* In case someone wanted to be clever, replaced stderr and failed at that. */
493 PyErr_Clear();
494 } else {
495 Py_DECREF(ret);
496 }
497 CPY_RELEASE_THREADS
498 }
500 static void cpy_flush_callback(int timeout, const char *id, user_data_t *data) {
501 cpy_callback_t * c = data->data;
502 PyObject *ret, *text;
504 CPY_LOCK_THREADS
505 text = cpy_string_to_unicode_or_bytes(id);
506 if (c->data == NULL)
507 ret = PyObject_CallFunction(c->callback, "iN", timeout, text); /* New reference. */
508 else
509 ret = PyObject_CallFunction(c->callback, "iNO", timeout, text, c->data); /* New reference. */
511 if (ret == NULL) {
512 cpy_log_exception("flush callback");
513 } else {
514 Py_DECREF(ret);
515 }
516 CPY_RELEASE_THREADS
517 }
519 static PyObject *cpy_register_generic(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
520 char buf[512];
521 cpy_callback_t *c;
522 const char *name = NULL;
523 PyObject *callback = NULL, *data = NULL, *mod = NULL;
524 static char *kwlist[] = {"callback", "data", "name", NULL};
526 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oet", kwlist, &callback, &data, NULL, &name) == 0) return NULL;
527 if (PyCallable_Check(callback) == 0) {
528 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
529 return NULL;
530 }
531 cpy_build_name(buf, sizeof(buf), callback, name);
533 Py_INCREF(callback);
534 Py_XINCREF(data);
535 c = malloc(sizeof(*c));
536 c->name = strdup(buf);
537 c->callback = callback;
538 c->data = data;
539 c->next = *list_head;
540 *list_head = c;
541 Py_XDECREF(mod);
542 return cpy_string_to_unicode_or_bytes(buf);
543 }
545 static PyObject *cpy_flush(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
546 int timeout = -1;
547 const char *plugin = NULL, *identifier = NULL;
548 static char *kwlist[] = {"plugin", "timeout", "identifier", NULL};
550 if (PyArg_ParseTupleAndKeywords(args, kwds, "|etiet", kwlist, NULL, &plugin, &timeout, NULL, &identifier) == 0) return NULL;
551 Py_BEGIN_ALLOW_THREADS
552 plugin_flush(plugin, timeout, identifier);
553 Py_END_ALLOW_THREADS
554 Py_RETURN_NONE;
555 }
557 static PyObject *cpy_register_config(PyObject *self, PyObject *args, PyObject *kwds) {
558 return cpy_register_generic(&cpy_config_callbacks, args, kwds);
559 }
561 static PyObject *cpy_register_init(PyObject *self, PyObject *args, PyObject *kwds) {
562 return cpy_register_generic(&cpy_init_callbacks, args, kwds);
563 }
565 typedef int reg_function_t(const char *name, void *callback, void *data);
567 static PyObject *cpy_register_generic_userdata(void *reg, void *handler, PyObject *args, PyObject *kwds) {
568 char buf[512];
569 reg_function_t *register_function = (reg_function_t *) reg;
570 cpy_callback_t *c = NULL;
571 user_data_t *user_data = NULL;
572 const char *name = NULL;
573 PyObject *callback = NULL, *data = NULL;
574 static char *kwlist[] = {"callback", "data", "name", NULL};
576 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oet", kwlist, &callback, &data, NULL, &name) == 0) return NULL;
577 if (PyCallable_Check(callback) == 0) {
578 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
579 return NULL;
580 }
581 cpy_build_name(buf, sizeof(buf), callback, name);
583 Py_INCREF(callback);
584 Py_XINCREF(data);
585 c = malloc(sizeof(*c));
586 c->name = strdup(buf);
587 c->callback = callback;
588 c->data = data;
589 c->next = NULL;
590 user_data = malloc(sizeof(*user_data));
591 user_data->free_func = cpy_destroy_user_data;
592 user_data->data = c;
593 register_function(buf, handler, user_data);
594 return cpy_string_to_unicode_or_bytes(buf);
595 }
597 static PyObject *cpy_register_read(PyObject *self, PyObject *args, PyObject *kwds) {
598 char buf[512];
599 cpy_callback_t *c = NULL;
600 user_data_t *user_data = NULL;
601 double interval = 0;
602 const char *name = NULL;
603 PyObject *callback = NULL, *data = NULL;
604 struct timespec ts;
605 static char *kwlist[] = {"callback", "interval", "data", "name", NULL};
607 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|dOet", kwlist, &callback, &interval, &data, NULL, &name) == 0) return NULL;
608 if (PyCallable_Check(callback) == 0) {
609 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
610 return NULL;
611 }
612 cpy_build_name(buf, sizeof(buf), callback, name);
614 Py_INCREF(callback);
615 Py_XINCREF(data);
616 c = malloc(sizeof(*c));
617 c->name = strdup(buf);
618 c->callback = callback;
619 c->data = data;
620 c->next = NULL;
621 user_data = malloc(sizeof(*user_data));
622 user_data->free_func = cpy_destroy_user_data;
623 user_data->data = c;
624 ts.tv_sec = interval;
625 ts.tv_nsec = (interval - ts.tv_sec) * 1000000000;
626 plugin_register_complex_read(/* group = */ NULL, buf,
627 cpy_read_callback, &ts, user_data);
628 return cpy_string_to_unicode_or_bytes(buf);
629 }
631 static PyObject *cpy_register_log(PyObject *self, PyObject *args, PyObject *kwds) {
632 return cpy_register_generic_userdata((void *) plugin_register_log,
633 (void *) cpy_log_callback, args, kwds);
634 }
636 static PyObject *cpy_register_write(PyObject *self, PyObject *args, PyObject *kwds) {
637 return cpy_register_generic_userdata((void *) plugin_register_write,
638 (void *) cpy_write_callback, args, kwds);
639 }
641 static PyObject *cpy_register_notification(PyObject *self, PyObject *args, PyObject *kwds) {
642 return cpy_register_generic_userdata((void *) plugin_register_notification,
643 (void *) cpy_notification_callback, args, kwds);
644 }
646 static PyObject *cpy_register_flush(PyObject *self, PyObject *args, PyObject *kwds) {
647 return cpy_register_generic_userdata((void *) plugin_register_flush,
648 (void *) cpy_flush_callback, args, kwds);
649 }
651 static PyObject *cpy_register_shutdown(PyObject *self, PyObject *args, PyObject *kwds) {
652 return cpy_register_generic(&cpy_shutdown_callbacks, args, kwds);
653 }
655 static PyObject *cpy_error(PyObject *self, PyObject *args) {
656 const char *text;
657 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
658 Py_BEGIN_ALLOW_THREADS
659 plugin_log(LOG_ERR, "%s", text);
660 Py_END_ALLOW_THREADS
661 Py_RETURN_NONE;
662 }
664 static PyObject *cpy_warning(PyObject *self, PyObject *args) {
665 const char *text;
666 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
667 Py_BEGIN_ALLOW_THREADS
668 plugin_log(LOG_WARNING, "%s", text);
669 Py_END_ALLOW_THREADS
670 Py_RETURN_NONE;
671 }
673 static PyObject *cpy_notice(PyObject *self, PyObject *args) {
674 const char *text;
675 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
676 Py_BEGIN_ALLOW_THREADS
677 plugin_log(LOG_NOTICE, "%s", text);
678 Py_END_ALLOW_THREADS
679 Py_RETURN_NONE;
680 }
682 static PyObject *cpy_info(PyObject *self, PyObject *args) {
683 const char *text;
684 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
685 Py_BEGIN_ALLOW_THREADS
686 plugin_log(LOG_INFO, "%s", text);
687 Py_END_ALLOW_THREADS
688 Py_RETURN_NONE;
689 }
691 static PyObject *cpy_debug(PyObject *self, PyObject *args) {
692 #ifdef COLLECT_DEBUG
693 const char *text;
694 if (PyArg_ParseTuple(args, "et", NULL, &text) == 0) return NULL;
695 Py_BEGIN_ALLOW_THREADS
696 plugin_log(LOG_DEBUG, "%s", text);
697 Py_END_ALLOW_THREADS
698 #endif
699 Py_RETURN_NONE;
700 }
702 static PyObject *cpy_unregister_generic(cpy_callback_t **list_head, PyObject *arg, const char *desc) {
703 char buf[512];
704 const char *name;
705 cpy_callback_t *prev = NULL, *tmp;
707 Py_INCREF(arg);
708 name = cpy_unicode_or_bytes_to_string(&arg);
709 if (name == NULL) {
710 PyErr_Clear();
711 if (!PyCallable_Check(arg)) {
712 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
713 Py_DECREF(arg);
714 return NULL;
715 }
716 cpy_build_name(buf, sizeof(buf), arg, NULL);
717 name = buf;
718 }
719 for (tmp = *list_head; tmp; prev = tmp, tmp = tmp->next)
720 if (strcmp(name, tmp->name) == 0)
721 break;
723 Py_DECREF(arg);
724 if (tmp == NULL) {
725 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
726 return NULL;
727 }
728 /* Yes, this is actually save. To call this function the caller has to
729 * hold the GIL. Well, save as long as there is only one GIL anyway ... */
730 if (prev == NULL)
731 *list_head = tmp->next;
732 else
733 prev->next = tmp->next;
734 cpy_destroy_user_data(tmp);
735 Py_RETURN_NONE;
736 }
738 typedef int cpy_unregister_function_t(const char *name);
740 static PyObject *cpy_unregister_generic_userdata(cpy_unregister_function_t *unreg, PyObject *arg, const char *desc) {
741 char buf[512];
742 const char *name;
744 Py_INCREF(arg);
745 name = cpy_unicode_or_bytes_to_string(&arg);
746 if (name == NULL) {
747 PyErr_Clear();
748 if (!PyCallable_Check(arg)) {
749 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
750 Py_DECREF(arg);
751 return NULL;
752 }
753 cpy_build_name(buf, sizeof(buf), arg, NULL);
754 name = buf;
755 }
756 if (unreg(name) == 0) {
757 Py_DECREF(arg);
758 Py_RETURN_NONE;
759 }
760 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
761 Py_DECREF(arg);
762 return NULL;
763 }
765 static PyObject *cpy_unregister_log(PyObject *self, PyObject *arg) {
766 return cpy_unregister_generic_userdata(plugin_unregister_log, arg, "log");
767 }
769 static PyObject *cpy_unregister_init(PyObject *self, PyObject *arg) {
770 return cpy_unregister_generic(&cpy_init_callbacks, arg, "init");
771 }
773 static PyObject *cpy_unregister_config(PyObject *self, PyObject *arg) {
774 return cpy_unregister_generic(&cpy_config_callbacks, arg, "config");
775 }
777 static PyObject *cpy_unregister_read(PyObject *self, PyObject *arg) {
778 return cpy_unregister_generic_userdata(plugin_unregister_read, arg, "read");
779 }
781 static PyObject *cpy_unregister_write(PyObject *self, PyObject *arg) {
782 return cpy_unregister_generic_userdata(plugin_unregister_write, arg, "write");
783 }
785 static PyObject *cpy_unregister_notification(PyObject *self, PyObject *arg) {
786 return cpy_unregister_generic_userdata(plugin_unregister_notification, arg, "notification");
787 }
789 static PyObject *cpy_unregister_flush(PyObject *self, PyObject *arg) {
790 return cpy_unregister_generic_userdata(plugin_unregister_flush, arg, "flush");
791 }
793 static PyObject *cpy_unregister_shutdown(PyObject *self, PyObject *arg) {
794 return cpy_unregister_generic(&cpy_shutdown_callbacks, arg, "shutdown");
795 }
797 static PyMethodDef cpy_methods[] = {
798 {"debug", cpy_debug, METH_VARARGS, log_doc},
799 {"info", cpy_info, METH_VARARGS, log_doc},
800 {"notice", cpy_notice, METH_VARARGS, log_doc},
801 {"warning", cpy_warning, METH_VARARGS, log_doc},
802 {"error", cpy_error, METH_VARARGS, log_doc},
803 {"flush", (PyCFunction) cpy_flush, METH_VARARGS | METH_KEYWORDS, flush_doc},
804 {"register_log", (PyCFunction) cpy_register_log, METH_VARARGS | METH_KEYWORDS, reg_log_doc},
805 {"register_init", (PyCFunction) cpy_register_init, METH_VARARGS | METH_KEYWORDS, reg_init_doc},
806 {"register_config", (PyCFunction) cpy_register_config, METH_VARARGS | METH_KEYWORDS, reg_config_doc},
807 {"register_read", (PyCFunction) cpy_register_read, METH_VARARGS | METH_KEYWORDS, reg_read_doc},
808 {"register_write", (PyCFunction) cpy_register_write, METH_VARARGS | METH_KEYWORDS, reg_write_doc},
809 {"register_notification", (PyCFunction) cpy_register_notification, METH_VARARGS | METH_KEYWORDS, reg_notification_doc},
810 {"register_flush", (PyCFunction) cpy_register_flush, METH_VARARGS | METH_KEYWORDS, reg_flush_doc},
811 {"register_shutdown", (PyCFunction) cpy_register_shutdown, METH_VARARGS | METH_KEYWORDS, reg_shutdown_doc},
812 {"unregister_log", cpy_unregister_log, METH_O, unregister_doc},
813 {"unregister_init", cpy_unregister_init, METH_O, unregister_doc},
814 {"unregister_config", cpy_unregister_config, METH_O, unregister_doc},
815 {"unregister_read", cpy_unregister_read, METH_O, unregister_doc},
816 {"unregister_write", cpy_unregister_write, METH_O, unregister_doc},
817 {"unregister_notification", cpy_unregister_notification, METH_O, unregister_doc},
818 {"unregister_flush", cpy_unregister_flush, METH_O, unregister_doc},
819 {"unregister_shutdown", cpy_unregister_shutdown, METH_O, unregister_doc},
820 {0, 0, 0, 0}
821 };
823 static int cpy_shutdown(void) {
824 cpy_callback_t *c;
825 PyObject *ret;
827 /* This can happen if the module was loaded but not configured. */
828 if (state != NULL)
829 PyEval_RestoreThread(state);
831 for (c = cpy_shutdown_callbacks; c; c = c->next) {
832 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
833 if (ret == NULL)
834 cpy_log_exception("shutdown callback");
835 else
836 Py_DECREF(ret);
837 }
838 PyErr_Print();
839 Py_Finalize();
840 return 0;
841 }
843 static void cpy_int_handler(int sig) {
844 return;
845 }
847 static void *cpy_interactive(void *data) {
848 sigset_t sigset;
849 struct sigaction sig_int_action, old;
851 /* Signal handler in a plugin? Bad stuff, but the best way to
852 * handle it I guess. In an interactive session people will
853 * press Ctrl+C at some time, which will generate a SIGINT.
854 * This will cause collectd to shutdown, thus killing the
855 * interactive interpreter, and leaving the terminal in a
856 * mess. Chances are, this isn't what the user wanted to do.
857 *
858 * So this is the plan:
859 * 1. Block SIGINT in the main thread.
860 * 2. Install our own signal handler that does nothing.
861 * 3. Unblock SIGINT in the interactive thread.
862 *
863 * This will make sure that SIGINT won't kill collectd but
864 * still interrupt syscalls like sleep and pause.
865 * It does not raise a KeyboardInterrupt exception because so
866 * far nobody managed to figure out how to do that. */
867 memset (&sig_int_action, '\0', sizeof (sig_int_action));
868 sig_int_action.sa_handler = cpy_int_handler;
869 sigaction (SIGINT, &sig_int_action, &old);
871 sigemptyset(&sigset);
872 sigaddset(&sigset, SIGINT);
873 pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
874 PyEval_AcquireThread(state);
875 if (PyImport_ImportModule("readline") == NULL) {
876 /* This interactive session will suck. */
877 cpy_log_exception("interactive session init");
878 }
879 PyRun_InteractiveLoop(stdin, "<stdin>");
880 PyErr_Print();
881 PyEval_ReleaseThread(state);
882 NOTICE("python: Interactive interpreter exited, stopping collectd ...");
883 /* Restore the original collectd SIGINT handler and raise SIGINT.
884 * The main thread still has SIGINT blocked and there's nothing we
885 * can do about that so this thread will handle it. But that's not
886 * important, except that it won't interrupt the main loop and so
887 * it might take a few seconds before collectd really shuts down. */
888 sigaction (SIGINT, &old, NULL);
889 raise(SIGINT);
890 pause();
891 return NULL;
892 }
894 static int cpy_init(void) {
895 cpy_callback_t *c;
896 PyObject *ret;
897 static pthread_t thread;
898 sigset_t sigset;
900 PyEval_InitThreads();
901 /* Now it's finally OK to use python threads. */
902 for (c = cpy_init_callbacks; c; c = c->next) {
903 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
904 if (ret == NULL)
905 cpy_log_exception("init callback");
906 else
907 Py_DECREF(ret);
908 }
909 sigemptyset(&sigset);
910 sigaddset(&sigset, SIGINT);
911 pthread_sigmask(SIG_BLOCK, &sigset, NULL);
912 state = PyEval_SaveThread();
913 if (do_interactive) {
914 if (pthread_create(&thread, NULL, cpy_interactive, NULL)) {
915 ERROR("python: Error creating thread for interactive interpreter.");
916 }
917 }
919 return 0;
920 }
922 static PyObject *cpy_oconfig_to_pyconfig(oconfig_item_t *ci, PyObject *parent) {
923 int i;
924 PyObject *item, *values, *children, *tmp;
926 if (parent == NULL)
927 parent = Py_None;
929 values = PyTuple_New(ci->values_num); /* New reference. */
930 for (i = 0; i < ci->values_num; ++i) {
931 if (ci->values[i].type == OCONFIG_TYPE_STRING) {
932 PyTuple_SET_ITEM(values, i, cpy_string_to_unicode_or_bytes(ci->values[i].value.string));
933 } else if (ci->values[i].type == OCONFIG_TYPE_NUMBER) {
934 PyTuple_SET_ITEM(values, i, PyFloat_FromDouble(ci->values[i].value.number));
935 } else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN) {
936 PyTuple_SET_ITEM(values, i, PyBool_FromLong(ci->values[i].value.boolean));
937 }
938 }
940 tmp = cpy_string_to_unicode_or_bytes(ci->key);
941 item = PyObject_CallFunction((void *) &ConfigType, "NONO", tmp, parent, values, Py_None);
942 if (item == NULL)
943 return NULL;
944 children = PyTuple_New(ci->children_num); /* New reference. */
945 for (i = 0; i < ci->children_num; ++i) {
946 PyTuple_SET_ITEM(children, i, cpy_oconfig_to_pyconfig(ci->children + i, item));
947 }
948 tmp = ((Config *) item)->children;
949 ((Config *) item)->children = children;
950 Py_XDECREF(tmp);
951 return item;
952 }
954 #ifdef IS_PY3K
955 static struct PyModuleDef collectdmodule = {
956 PyModuleDef_HEAD_INIT,
957 "collectd", /* name of module */
958 "The python interface to collectd", /* module documentation, may be NULL */
959 -1,
960 cpy_methods
961 };
963 PyMODINIT_FUNC PyInit_collectd(void) {
964 return PyModule_Create(&collectdmodule);
965 }
966 #endif
968 static int cpy_config(oconfig_item_t *ci) {
969 int i;
970 PyObject *sys, *tb;
971 PyObject *sys_path;
972 PyObject *module;
974 /* Ok in theory we shouldn't do initialization at this point
975 * but we have to. In order to give python scripts a chance
976 * to register a config callback we need to be able to execute
977 * python code during the config callback so we have to start
978 * the interpreter here. */
979 /* Do *not* use the python "thread" module at this point! */
981 #ifdef IS_PY3K
982 /* Add a builtin module, before Py_Initialize */
983 PyImport_AppendInittab("collectd", PyInit_collectd);
984 #endif
986 Py_Initialize();
988 PyType_Ready(&ConfigType);
989 PyType_Ready(&PluginDataType);
990 ValuesType.tp_base = &PluginDataType;
991 PyType_Ready(&ValuesType);
992 NotificationType.tp_base = &PluginDataType;
993 PyType_Ready(&NotificationType);
994 SignedType.tp_base = &PyLong_Type;
995 PyType_Ready(&SignedType);
996 UnsignedType.tp_base = &PyLong_Type;
997 PyType_Ready(&UnsignedType);
998 sys = PyImport_ImportModule("sys"); /* New reference. */
999 if (sys == NULL) {
1000 cpy_log_exception("python initialization");
1001 return 1;
1002 }
1003 sys_path = PyObject_GetAttrString(sys, "path"); /* New reference. */
1004 Py_DECREF(sys);
1005 if (sys_path == NULL) {
1006 cpy_log_exception("python initialization");
1007 return 1;
1008 }
1009 #ifdef IS_PY3K
1010 module = PyImport_ImportModule("collectd");
1011 #else
1012 module = Py_InitModule("collectd", cpy_methods); /* Borrowed reference. */
1013 #endif
1014 PyModule_AddObject(module, "Config", (void *) &ConfigType); /* Steals a reference. */
1015 PyModule_AddObject(module, "Values", (void *) &ValuesType); /* Steals a reference. */
1016 PyModule_AddObject(module, "Notification", (void *) &NotificationType); /* Steals a reference. */
1017 PyModule_AddObject(module, "Signed", (void *) &SignedType); /* Steals a reference. */
1018 PyModule_AddObject(module, "Unsigned", (void *) &UnsignedType); /* Steals a reference. */
1019 PyModule_AddIntConstant(module, "LOG_DEBUG", LOG_DEBUG);
1020 PyModule_AddIntConstant(module, "LOG_INFO", LOG_INFO);
1021 PyModule_AddIntConstant(module, "LOG_NOTICE", LOG_NOTICE);
1022 PyModule_AddIntConstant(module, "LOG_WARNING", LOG_WARNING);
1023 PyModule_AddIntConstant(module, "LOG_ERROR", LOG_ERR);
1024 PyModule_AddIntConstant(module, "NOTIF_FAILURE", NOTIF_FAILURE);
1025 PyModule_AddIntConstant(module, "NOTIF_WARNING", NOTIF_WARNING);
1026 PyModule_AddIntConstant(module, "NOTIF_OKAY", NOTIF_OKAY);
1027 for (i = 0; i < ci->children_num; ++i) {
1028 oconfig_item_t *item = ci->children + i;
1030 if (strcasecmp(item->key, "Interactive") == 0) {
1031 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
1032 continue;
1033 do_interactive = item->values[0].value.boolean;
1034 } else if (strcasecmp(item->key, "Encoding") == 0) {
1035 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_STRING)
1036 continue;
1037 /* Why is this even necessary? And undocumented? */
1038 if (PyUnicode_SetDefaultEncoding(item->values[0].value.string))
1039 cpy_log_exception("setting default encoding");
1040 } else if (strcasecmp(item->key, "LogTraces") == 0) {
1041 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
1042 continue;
1043 if (!item->values[0].value.boolean) {
1044 Py_XDECREF(cpy_format_exception);
1045 cpy_format_exception = NULL;
1046 continue;
1047 }
1048 if (cpy_format_exception)
1049 continue;
1050 tb = PyImport_ImportModule("traceback"); /* New reference. */
1051 if (tb == NULL) {
1052 cpy_log_exception("python initialization");
1053 continue;
1054 }
1055 cpy_format_exception = PyObject_GetAttrString(tb, "format_exception"); /* New reference. */
1056 Py_DECREF(tb);
1057 if (cpy_format_exception == NULL)
1058 cpy_log_exception("python initialization");
1059 } else if (strcasecmp(item->key, "ModulePath") == 0) {
1060 char *dir = NULL;
1061 PyObject *dir_object;
1063 if (cf_util_get_string(item, &dir) != 0)
1064 continue;
1065 dir_object = cpy_string_to_unicode_or_bytes(dir); /* New reference. */
1066 if (dir_object == NULL) {
1067 ERROR("python plugin: Unable to convert \"%s\" to "
1068 "a python object.", dir);
1069 free(dir);
1070 cpy_log_exception("python initialization");
1071 continue;
1072 }
1073 if (PyList_Append(sys_path, dir_object) != 0) {
1074 ERROR("python plugin: Unable to append \"%s\" to "
1075 "python module path.", dir);
1076 cpy_log_exception("python initialization");
1077 }
1078 Py_DECREF(dir_object);
1079 free(dir);
1080 } else if (strcasecmp(item->key, "Import") == 0) {
1081 char *module_name = NULL;
1082 PyObject *module;
1084 if (cf_util_get_string(item, &module_name) != 0)
1085 continue;
1086 module = PyImport_ImportModule(module_name); /* New reference. */
1087 if (module == NULL) {
1088 ERROR("python plugin: Error importing module \"%s\".", module_name);
1089 cpy_log_exception("importing module");
1090 }
1091 free(module_name);
1092 Py_XDECREF(module);
1093 } else if (strcasecmp(item->key, "Module") == 0) {
1094 char *name = NULL;
1095 cpy_callback_t *c;
1096 PyObject *ret;
1098 if (cf_util_get_string(item, &name) != 0)
1099 continue;
1100 for (c = cpy_config_callbacks; c; c = c->next) {
1101 if (strcasecmp(c->name + 7, name) == 0)
1102 break;
1103 }
1104 if (c == NULL) {
1105 WARNING("python plugin: Found a configuration for the \"%s\" plugin, "
1106 "but the plugin isn't loaded or didn't register "
1107 "a configuration callback.", name);
1108 free(name);
1109 continue;
1110 }
1111 free(name);
1112 if (c->data == NULL)
1113 ret = PyObject_CallFunction(c->callback, "N",
1114 cpy_oconfig_to_pyconfig(item, NULL)); /* New reference. */
1115 else
1116 ret = PyObject_CallFunction(c->callback, "NO",
1117 cpy_oconfig_to_pyconfig(item, NULL), c->data); /* New reference. */
1118 if (ret == NULL)
1119 cpy_log_exception("loading module");
1120 else
1121 Py_DECREF(ret);
1122 } else {
1123 WARNING("python plugin: Ignoring unknown config key \"%s\".", item->key);
1124 }
1125 }
1126 Py_DECREF(sys_path);
1127 return 0;
1128 }
1130 void module_register(void) {
1131 plugin_register_complex_config("python", cpy_config);
1132 plugin_register_init("python", cpy_init);
1133 plugin_register_shutdown("python", cpy_shutdown);
1134 }