2 * collectd - src/python.c
3 * Copyright (C) 2009 Sven Trenkel
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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.
24 * Sven Trenkel <collectd at semidefinite.de>
28 #include <structmember.h>
40 typedef struct cpy_callback_s {
44 struct cpy_callback_s *next;
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"
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"
58 "Register a callback function for log messages.\n"
60 "'callback' is a callable object that will be called every time something\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"
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"
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"
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"
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"
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"
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"
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"
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"
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"
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"
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"
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"
155 "Register a callback function for notifications.\n"
156 "'callback' is a callable object that will be called every time a notification\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"
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"
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"
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"
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"
195 "Register a callback function for collectd shutdown.\n"
196 "'callback' is a callable object that will be called once collectd is\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"
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;
229 Py_DECREF(c->callback);
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;
242 snprintf(buf, size, "python.%s", name);
246 mod = PyObject_GetAttrString(callback, "__module__"); /* New reference. */
248 module = cpy_unicode_or_bytes_to_string(&mod);
250 if (module != NULL) {
251 snprintf(buf, size, "python.%s", module);
258 snprintf(buf, size, "python.%p", callback);
262 static void cpy_log_exception(const char *context) {
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. */
273 typename = cpy_unicode_or_bytes_to_string(&tn);
275 message = cpy_unicode_or_bytes_to_string(&m);
276 if (typename == NULL)
277 typename = "NamelessException";
280 Py_BEGIN_ALLOW_THREADS
281 ERROR("Unhandled python exception in %s: %s: %s", context, typename, message);
285 if (!cpy_format_exception) {
289 Py_XDECREF(traceback);
296 list = PyObject_CallFunction(cpy_format_exception, "NNN", type, value, traceback); /* New reference. */
298 l = PyObject_Length(list);
299 for (i = 0; i < l; ++i) {
303 line = PyList_GET_ITEM(list, i); /* Borrowed reference. */
305 s = strdup(cpy_unicode_or_bytes_to_string(&line));
307 if (s[strlen(s) - 1] == '\n')
308 s[strlen(s) - 1] = 0;
309 Py_BEGIN_ALLOW_THREADS
318 static int cpy_read_callback(user_data_t *data) {
319 cpy_callback_t *c = data->data;
323 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
325 cpy_log_exception("read callback");
335 static int cpy_write_callback(const data_set_t *ds, const value_list_t *value_list, user_data_t *data) {
337 cpy_callback_t *c = data->data;
338 PyObject *ret, *v, *list;
341 list = PyList_New(value_list->values_len); /* New reference. */
343 cpy_log_exception("write callback");
344 CPY_RETURN_FROM_THREADS 0;
346 for (i = 0; i < value_list->values_len; ++i) {
347 if (ds->ds->type == DS_TYPE_COUNTER) {
348 if ((long) value_list->values[i].counter == value_list->values[i].counter)
349 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].counter));
351 PyList_SetItem(list, i, PyLong_FromUnsignedLongLong(value_list->values[i].counter));
352 } else if (ds->ds->type == DS_TYPE_GAUGE) {
353 PyList_SetItem(list, i, PyFloat_FromDouble(value_list->values[i].gauge));
354 } else if (ds->ds->type == DS_TYPE_DERIVE) {
355 if ((long) value_list->values[i].derive == value_list->values[i].derive)
356 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].derive));
358 PyList_SetItem(list, i, PyLong_FromLongLong(value_list->values[i].derive));
359 } else if (ds->ds->type == DS_TYPE_ABSOLUTE) {
360 if ((long) value_list->values[i].absolute == value_list->values[i].absolute)
361 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].absolute));
363 PyList_SetItem(list, i, PyLong_FromUnsignedLongLong(value_list->values[i].absolute));
365 Py_BEGIN_ALLOW_THREADS
366 ERROR("cpy_write_callback: Unknown value type %d.", ds->ds->type);
369 CPY_RETURN_FROM_THREADS 0;
371 if (PyErr_Occurred() != NULL) {
372 cpy_log_exception("value building for write callback");
373 CPY_RETURN_FROM_THREADS 0;
376 v = PyObject_CallFunction((void *) &ValuesType, "sOssssdi", value_list->type, list,
377 value_list->plugin_instance, value_list->type_instance, value_list->plugin,
378 value_list->host, (double) value_list->time, value_list->interval);
380 ret = PyObject_CallFunctionObjArgs(c->callback, v, c->data, (void *) 0); /* New reference. */
382 cpy_log_exception("write callback");
390 static int cpy_notification_callback(const notification_t *notification, user_data_t *data) {
391 cpy_callback_t *c = data->data;
395 n = PyObject_CallFunction((void *) &NotificationType, "ssssssdi", notification->type, notification->message,
396 notification->plugin_instance, notification->type_instance, notification->plugin,
397 notification->host, (double) notification->time, notification->severity);
398 ret = PyObject_CallFunctionObjArgs(c->callback, n, c->data, (void *) 0); /* New reference. */
400 cpy_log_exception("notification callback");
408 static void cpy_log_callback(int severity, const char *message, user_data_t *data) {
409 cpy_callback_t * c = data->data;
414 ret = PyObject_CallFunction(c->callback, "is", severity, message); /* New reference. */
416 ret = PyObject_CallFunction(c->callback, "isO", severity, message, c->data); /* New reference. */
420 /* Do we really want to trigger a log callback because a log callback failed?
423 /* In case someone wanted to be clever, replaced stderr and failed at that. */
431 static void cpy_flush_callback(int timeout, const char *id, user_data_t *data) {
432 cpy_callback_t * c = data->data;
437 ret = PyObject_CallFunction(c->callback, "is", timeout, id); /* New reference. */
439 ret = PyObject_CallFunction(c->callback, "isO", timeout, id, c->data); /* New reference. */
442 cpy_log_exception("flush callback");
449 static PyObject *cpy_register_generic(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
452 const char *name = NULL;
453 PyObject *callback = NULL, *data = NULL, *mod = NULL;
454 static char *kwlist[] = {"callback", "data", "name", NULL};
456 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oz", kwlist, &callback, &data, &name) == 0) return NULL;
457 if (PyCallable_Check(callback) == 0) {
458 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
461 cpy_build_name(buf, sizeof(buf), callback, name);
465 c = malloc(sizeof(*c));
466 c->name = strdup(buf);
467 c->callback = callback;
469 c->next = *list_head;
472 return cpy_string_to_unicode_or_bytes(buf);
475 static PyObject *cpy_flush(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
477 const char *plugin = NULL, *identifier = NULL;
478 static char *kwlist[] = {"plugin", "timeout", "identifier", NULL};
480 if (PyArg_ParseTupleAndKeywords(args, kwds, "|ziz", kwlist, &plugin, &timeout, &identifier) == 0) return NULL;
481 Py_BEGIN_ALLOW_THREADS
482 plugin_flush(plugin, timeout, identifier);
487 static PyObject *cpy_register_config(PyObject *self, PyObject *args, PyObject *kwds) {
488 return cpy_register_generic(&cpy_config_callbacks, args, kwds);
491 static PyObject *cpy_register_init(PyObject *self, PyObject *args, PyObject *kwds) {
492 return cpy_register_generic(&cpy_init_callbacks, args, kwds);
495 typedef int reg_function_t(const char *name, void *callback, void *data);
497 static PyObject *cpy_register_generic_userdata(void *reg, void *handler, PyObject *args, PyObject *kwds) {
499 reg_function_t *register_function = (reg_function_t *) reg;
500 cpy_callback_t *c = NULL;
501 user_data_t *user_data = NULL;
502 const char *name = NULL;
503 PyObject *callback = NULL, *data = NULL;
504 static char *kwlist[] = {"callback", "data", "name", NULL};
506 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oz", kwlist, &callback, &data, &name) == 0) return NULL;
507 if (PyCallable_Check(callback) == 0) {
508 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
511 cpy_build_name(buf, sizeof(buf), callback, name);
515 c = malloc(sizeof(*c));
516 c->name = strdup(buf);
517 c->callback = callback;
520 user_data = malloc(sizeof(*user_data));
521 user_data->free_func = cpy_destroy_user_data;
523 register_function(buf, handler, user_data);
524 return cpy_string_to_unicode_or_bytes(buf);
527 static PyObject *cpy_register_read(PyObject *self, PyObject *args, PyObject *kwds) {
529 cpy_callback_t *c = NULL;
530 user_data_t *user_data = NULL;
532 const char *name = NULL;
533 PyObject *callback = NULL, *data = NULL;
535 static char *kwlist[] = {"callback", "interval", "data", "name", NULL};
537 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|dOz", kwlist, &callback, &interval, &data, &name) == 0) return NULL;
538 if (PyCallable_Check(callback) == 0) {
539 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
542 cpy_build_name(buf, sizeof(buf), callback, name);
546 c = malloc(sizeof(*c));
547 c->name = strdup(buf);
548 c->callback = callback;
551 user_data = malloc(sizeof(*user_data));
552 user_data->free_func = cpy_destroy_user_data;
554 ts.tv_sec = interval;
555 ts.tv_nsec = (interval - ts.tv_sec) * 1000000000;
556 plugin_register_complex_read(buf, cpy_read_callback, &ts, user_data);
557 return cpy_string_to_unicode_or_bytes(buf);
560 static PyObject *cpy_register_log(PyObject *self, PyObject *args, PyObject *kwds) {
561 return cpy_register_generic_userdata((void *) plugin_register_log,
562 (void *) cpy_log_callback, args, kwds);
565 static PyObject *cpy_register_write(PyObject *self, PyObject *args, PyObject *kwds) {
566 return cpy_register_generic_userdata((void *) plugin_register_write,
567 (void *) cpy_write_callback, args, kwds);
570 static PyObject *cpy_register_notification(PyObject *self, PyObject *args, PyObject *kwds) {
571 return cpy_register_generic_userdata((void *) plugin_register_notification,
572 (void *) cpy_notification_callback, args, kwds);
575 static PyObject *cpy_register_flush(PyObject *self, PyObject *args, PyObject *kwds) {
576 return cpy_register_generic_userdata((void *) plugin_register_flush,
577 (void *) cpy_flush_callback, args, kwds);
580 static PyObject *cpy_register_shutdown(PyObject *self, PyObject *args, PyObject *kwds) {
581 return cpy_register_generic(&cpy_shutdown_callbacks, args, kwds);
584 static PyObject *cpy_error(PyObject *self, PyObject *args) {
586 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
587 Py_BEGIN_ALLOW_THREADS
588 plugin_log(LOG_ERR, "%s", text);
593 static PyObject *cpy_warning(PyObject *self, PyObject *args) {
595 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
596 Py_BEGIN_ALLOW_THREADS
597 plugin_log(LOG_WARNING, "%s", text);
602 static PyObject *cpy_notice(PyObject *self, PyObject *args) {
604 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
605 Py_BEGIN_ALLOW_THREADS
606 plugin_log(LOG_NOTICE, "%s", text);
611 static PyObject *cpy_info(PyObject *self, PyObject *args) {
613 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
614 Py_BEGIN_ALLOW_THREADS
615 plugin_log(LOG_INFO, "%s", text);
620 static PyObject *cpy_debug(PyObject *self, PyObject *args) {
623 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
624 Py_BEGIN_ALLOW_THREADS
625 plugin_log(LOG_DEBUG, "%s", text);
631 static PyObject *cpy_unregister_generic(cpy_callback_t **list_head, PyObject *arg, const char *desc) {
634 cpy_callback_t *prev = NULL, *tmp;
637 name = cpy_unicode_or_bytes_to_string(&arg);
640 if (!PyCallable_Check(arg)) {
641 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
645 cpy_build_name(buf, sizeof(buf), arg, NULL);
648 for (tmp = *list_head; tmp; prev = tmp, tmp = tmp->next)
649 if (strcmp(name, tmp->name) == 0)
654 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
657 /* Yes, this is actually save. To call this function the caller has to
658 * hold the GIL. Well, save as long as there is only one GIL anyway ... */
660 *list_head = tmp->next;
662 prev->next = tmp->next;
663 cpy_destroy_user_data(tmp);
667 typedef int cpy_unregister_function_t(const char *name);
669 static PyObject *cpy_unregister_generic_userdata(cpy_unregister_function_t *unreg, PyObject *arg, const char *desc) {
674 name = cpy_unicode_or_bytes_to_string(&arg);
677 if (!PyCallable_Check(arg)) {
678 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
682 cpy_build_name(buf, sizeof(buf), arg, NULL);
685 if (unreg(name) == 0) {
689 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
694 static PyObject *cpy_unregister_log(PyObject *self, PyObject *arg) {
695 return cpy_unregister_generic_userdata(plugin_unregister_log, arg, "log");
698 static PyObject *cpy_unregister_init(PyObject *self, PyObject *arg) {
699 return cpy_unregister_generic(&cpy_init_callbacks, arg, "init");
702 static PyObject *cpy_unregister_config(PyObject *self, PyObject *arg) {
703 return cpy_unregister_generic(&cpy_config_callbacks, arg, "config");
706 static PyObject *cpy_unregister_read(PyObject *self, PyObject *arg) {
707 return cpy_unregister_generic_userdata(plugin_unregister_read, arg, "read");
710 static PyObject *cpy_unregister_write(PyObject *self, PyObject *arg) {
711 return cpy_unregister_generic_userdata(plugin_unregister_write, arg, "write");
714 static PyObject *cpy_unregister_notification(PyObject *self, PyObject *arg) {
715 return cpy_unregister_generic_userdata(plugin_unregister_notification, arg, "notification");
718 static PyObject *cpy_unregister_flush(PyObject *self, PyObject *arg) {
719 return cpy_unregister_generic_userdata(plugin_unregister_flush, arg, "flush");
722 static PyObject *cpy_unregister_shutdown(PyObject *self, PyObject *arg) {
723 return cpy_unregister_generic(&cpy_shutdown_callbacks, arg, "shutdown");
726 static PyMethodDef cpy_methods[] = {
727 {"debug", cpy_debug, METH_VARARGS, log_doc},
728 {"info", cpy_info, METH_VARARGS, log_doc},
729 {"notice", cpy_notice, METH_VARARGS, log_doc},
730 {"warning", cpy_warning, METH_VARARGS, log_doc},
731 {"error", cpy_error, METH_VARARGS, log_doc},
732 {"flush", (PyCFunction) cpy_flush, METH_VARARGS | METH_KEYWORDS, flush_doc},
733 {"register_log", (PyCFunction) cpy_register_log, METH_VARARGS | METH_KEYWORDS, reg_log_doc},
734 {"register_init", (PyCFunction) cpy_register_init, METH_VARARGS | METH_KEYWORDS, reg_init_doc},
735 {"register_config", (PyCFunction) cpy_register_config, METH_VARARGS | METH_KEYWORDS, reg_config_doc},
736 {"register_read", (PyCFunction) cpy_register_read, METH_VARARGS | METH_KEYWORDS, reg_read_doc},
737 {"register_write", (PyCFunction) cpy_register_write, METH_VARARGS | METH_KEYWORDS, reg_write_doc},
738 {"register_notification", (PyCFunction) cpy_register_notification, METH_VARARGS | METH_KEYWORDS, reg_notification_doc},
739 {"register_flush", (PyCFunction) cpy_register_flush, METH_VARARGS | METH_KEYWORDS, reg_flush_doc},
740 {"register_shutdown", (PyCFunction) cpy_register_shutdown, METH_VARARGS | METH_KEYWORDS, reg_shutdown_doc},
741 {"unregister_log", cpy_unregister_log, METH_O, unregister_doc},
742 {"unregister_init", cpy_unregister_init, METH_O, unregister_doc},
743 {"unregister_config", cpy_unregister_config, METH_O, unregister_doc},
744 {"unregister_read", cpy_unregister_read, METH_O, unregister_doc},
745 {"unregister_write", cpy_unregister_write, METH_O, unregister_doc},
746 {"unregister_notification", cpy_unregister_notification, METH_O, unregister_doc},
747 {"unregister_flush", cpy_unregister_flush, METH_O, unregister_doc},
748 {"unregister_shutdown", cpy_unregister_shutdown, METH_O, unregister_doc},
752 static int cpy_shutdown(void) {
756 /* This can happen if the module was loaded but not configured. */
758 PyEval_RestoreThread(state);
760 for (c = cpy_shutdown_callbacks; c; c = c->next) {
761 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
763 cpy_log_exception("shutdown callback");
772 static void cpy_int_handler(int sig) {
776 static void *cpy_interactive(void *data) {
778 struct sigaction sig_int_action, old;
780 /* Signal handler in a plugin? Bad stuff, but the best way to
781 * handle it I guess. In an interactive session people will
782 * press Ctrl+C at some time, which will generate a SIGINT.
783 * This will cause collectd to shutdown, thus killing the
784 * interactive interpreter, and leaving the terminal in a
785 * mess. Chances are, this isn't what the user wanted to do.
787 * So this is the plan:
788 * 1. Block SIGINT in the main thread.
789 * 2. Install our own signal handler that does nothing.
790 * 3. Unblock SIGINT in the interactive thread.
792 * This will make sure that SIGINT won't kill collectd but
793 * still interrupt syscalls like sleep and pause.
794 * It does not raise a KeyboardInterrupt exception because so
795 * far nobody managed to figure out how to do that. */
796 memset (&sig_int_action, '\0', sizeof (sig_int_action));
797 sig_int_action.sa_handler = cpy_int_handler;
798 sigaction (SIGINT, &sig_int_action, &old);
800 sigemptyset(&sigset);
801 sigaddset(&sigset, SIGINT);
802 pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
803 PyEval_AcquireThread(state);
804 if (PyImport_ImportModule("readline") == NULL) {
805 /* This interactive session will suck. */
806 cpy_log_exception("interactive session init");
808 PyRun_InteractiveLoop(stdin, "<stdin>");
810 PyEval_ReleaseThread(state);
811 NOTICE("python: Interactive interpreter exited, stopping collectd ...");
812 /* Restore the original collectd SIGINT handler and raise SIGINT.
813 * The main thread still has SIGINT blocked and there's nothing we
814 * can do about that so this thread will handle it. But that's not
815 * important, except that it won't interrupt the main loop and so
816 * it might take a few seconds before collectd really shuts down. */
817 sigaction (SIGINT, &old, NULL);
823 static int cpy_init(void) {
826 static pthread_t thread;
829 PyEval_InitThreads();
830 /* Now it's finally OK to use python threads. */
831 for (c = cpy_init_callbacks; c; c = c->next) {
832 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
834 cpy_log_exception("init callback");
838 sigemptyset(&sigset);
839 sigaddset(&sigset, SIGINT);
840 pthread_sigmask(SIG_BLOCK, &sigset, NULL);
841 state = PyEval_SaveThread();
842 if (do_interactive) {
843 if (pthread_create(&thread, NULL, cpy_interactive, NULL)) {
844 ERROR("python: Error creating thread for interactive interpreter.");
851 static PyObject *cpy_oconfig_to_pyconfig(oconfig_item_t *ci, PyObject *parent) {
853 PyObject *item, *values, *children, *tmp;
858 values = PyTuple_New(ci->values_num); /* New reference. */
859 for (i = 0; i < ci->values_num; ++i) {
860 if (ci->values[i].type == OCONFIG_TYPE_STRING) {
861 PyTuple_SET_ITEM(values, i, cpy_string_to_unicode_or_bytes(ci->values[i].value.string));
862 } else if (ci->values[i].type == OCONFIG_TYPE_NUMBER) {
863 PyTuple_SET_ITEM(values, i, PyFloat_FromDouble(ci->values[i].value.number));
864 } else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN) {
865 PyTuple_SET_ITEM(values, i, PyBool_FromLong(ci->values[i].value.boolean));
869 item = PyObject_CallFunction((void *) &ConfigType, "sONO", ci->key, parent, values, Py_None);
872 children = PyTuple_New(ci->children_num); /* New reference. */
873 for (i = 0; i < ci->children_num; ++i) {
874 PyTuple_SET_ITEM(children, i, cpy_oconfig_to_pyconfig(ci->children + i, item));
876 tmp = ((Config *) item)->children;
877 ((Config *) item)->children = children;
882 static struct PyModuleDef collectdmodule = {
883 PyModuleDef_HEAD_INIT,
884 "collectd", /* name of module */
885 "Where does this go?", /* module documentation, may be NULL */
890 PyMODINIT_FUNC PyInit_collectd(void) {
891 return PyModule_Create(&collectdmodule);
894 static int cpy_config(oconfig_item_t *ci) {
900 /* Ok in theory we shouldn't do initialization at this point
901 * but we have to. In order to give python scripts a chance
902 * to register a config callback we need to be able to execute
903 * python code during the config callback so we have to start
904 * the interpreter here. */
905 /* Do *not* use the python "thread" module at this point! */
908 /* Add a builtin module, before Py_Initialize */
909 PyImport_AppendInittab("collectd", PyInit_collectd);
914 PyType_Ready(&ConfigType);
915 PyType_Ready(&PluginDataType);
916 ValuesType.tp_base = &PluginDataType;
917 PyType_Ready(&ValuesType);
918 NotificationType.tp_base = &PluginDataType;
919 PyType_Ready(&NotificationType);
920 sys = PyImport_ImportModule("sys"); /* New reference. */
922 cpy_log_exception("python initialization");
925 sys_path = PyObject_GetAttrString(sys, "path"); /* New reference. */
927 if (sys_path == NULL) {
928 cpy_log_exception("python initialization");
932 module = PyImport_ImportModule("collectd");
934 module = Py_InitModule("collectd", cpy_methods); /* Borrowed reference. */
936 PyModule_AddObject(module, "Config", (void *) &ConfigType); /* Steals a reference. */
937 PyModule_AddObject(module, "Values", (void *) &ValuesType); /* Steals a reference. */
938 PyModule_AddObject(module, "Notification", (void *) &NotificationType); /* Steals a reference. */
939 PyModule_AddIntConstant(module, "LOG_DEBUG", LOG_DEBUG);
940 PyModule_AddIntConstant(module, "LOG_INFO", LOG_INFO);
941 PyModule_AddIntConstant(module, "LOG_NOTICE", LOG_NOTICE);
942 PyModule_AddIntConstant(module, "LOG_WARNING", LOG_WARNING);
943 PyModule_AddIntConstant(module, "LOG_ERROR", LOG_ERR);
944 PyModule_AddIntConstant(module, "NOTIF_FAILURE", NOTIF_FAILURE);
945 PyModule_AddIntConstant(module, "NOTIF_WARNING", NOTIF_WARNING);
946 PyModule_AddIntConstant(module, "NOTIF_OKAY", NOTIF_OKAY);
947 for (i = 0; i < ci->children_num; ++i) {
948 oconfig_item_t *item = ci->children + i;
950 if (strcasecmp(item->key, "Interactive") == 0) {
951 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
953 do_interactive = item->values[0].value.boolean;
954 } else if (strcasecmp(item->key, "Encoding") == 0) {
955 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_STRING)
957 /* Why is this even necessary? And undocumented? */
958 if (PyUnicode_SetDefaultEncoding(item->values[0].value.string))
959 cpy_log_exception("setting default encoding");
960 } else if (strcasecmp(item->key, "LogTraces") == 0) {
961 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
963 if (!item->values[0].value.boolean) {
964 Py_XDECREF(cpy_format_exception);
965 cpy_format_exception = NULL;
968 if (cpy_format_exception)
970 tb = PyImport_ImportModule("traceback"); /* New reference. */
972 cpy_log_exception("python initialization");
975 cpy_format_exception = PyObject_GetAttrString(tb, "format_exception"); /* New reference. */
977 if (cpy_format_exception == NULL)
978 cpy_log_exception("python initialization");
979 } else if (strcasecmp(item->key, "ModulePath") == 0) {
981 PyObject *dir_object;
983 if (cf_util_get_string(item, &dir) != 0)
985 dir_object = cpy_string_to_unicode_or_bytes(dir); /* New reference. */
986 if (dir_object == NULL) {
987 ERROR("python plugin: Unable to convert \"%s\" to "
988 "a python object.", dir);
990 cpy_log_exception("python initialization");
993 if (PyList_Append(sys_path, dir_object) != 0) {
994 ERROR("python plugin: Unable to append \"%s\" to "
995 "python module path.", dir);
996 cpy_log_exception("python initialization");
998 Py_DECREF(dir_object);
1000 } else if (strcasecmp(item->key, "Import") == 0) {
1001 char *module_name = NULL;
1004 if (cf_util_get_string(item, &module_name) != 0)
1006 module = PyImport_ImportModule(module_name); /* New reference. */
1007 if (module == NULL) {
1008 ERROR("python plugin: Error importing module \"%s\".", module_name);
1009 cpy_log_exception("importing module");
1013 } else if (strcasecmp(item->key, "Module") == 0) {
1018 if (cf_util_get_string(item, &name) != 0)
1020 for (c = cpy_config_callbacks; c; c = c->next) {
1021 if (strcasecmp(c->name + 7, name) == 0)
1025 WARNING("python plugin: Found a configuration for the \"%s\" plugin, "
1026 "but the plugin isn't loaded or didn't register "
1027 "a configuration callback.", name);
1032 if (c->data == NULL)
1033 ret = PyObject_CallFunction(c->callback, "N",
1034 cpy_oconfig_to_pyconfig(item, NULL)); /* New reference. */
1036 ret = PyObject_CallFunction(c->callback, "NO",
1037 cpy_oconfig_to_pyconfig(item, NULL), c->data); /* New reference. */
1039 cpy_log_exception("loading module");
1043 WARNING("python plugin: Ignoring unknown config key \"%s\".", item->key);
1046 Py_DECREF(sys_path);
1050 void module_register(void) {
1051 plugin_register_complex_config("python", cpy_config);
1052 plugin_register_init("python", cpy_init);
1053 plugin_register_shutdown("python", cpy_shutdown);