2 #include <structmember.h>
14 typedef struct cpy_callback_s {
18 struct cpy_callback_s *next;
21 static char log_doc[] = "This function sends a string to all logging plugins.";
23 static char flush_doc[] = "flush([plugin][, timeout][, identifier]) -> None\n"
25 "Flushes the cache of another plugin.";
27 static char unregister_doc[] = "Unregisters a callback. This function needs exactly one parameter either\n"
28 "the function to unregister or the callback identifier to unregister.";
30 static char reg_log_doc[] = "register_log(callback[, data][, name]) -> identifier\n"
32 "Register a callback function for log messages.\n"
34 "'callback' is a callable object that will be called every time something\n"
36 "'data' is an optional object that will be passed back to the callback\n"
37 " function every time it is called.\n"
38 "'name' is an optional identifier for this callback. The default name\n"
39 " is 'python.<module>.<name>'. If 'name' contains a '.' it\n"
40 " replaces both module and name, otherwise it replaces only name.\n"
41 " Every callback needs a unique identifier, so if you want to\n"
42 " register one function multiple time you need to specify a name\n"
44 "'identifier' is the full identifier assigned to this callback.\n"
46 "The callback function will be called with two or three parameters:\n"
47 "severity: An integer that should be compared to the LOG_ constants.\n"
48 "message: The text to be logged.\n"
49 "data: The optional data parameter passed to the register function.\n"
50 " If the parameter was obmitted it will be obmitted here, too.";
52 static char reg_init_doc[] = "register_init(callback[, data][, name]) -> identifier\n"
54 "Register a callback function that will be executed once after the config.\n"
55 "file has been read, all plugins heve been loaded and the collectd has\n"
56 "forked into the backgroud.\n"
58 "'callback' is a callable object that will be executed.\n"
59 "'data' is an optional object that will be passed back to the callback\n"
60 " function when it is called.\n"
61 "'name' is an optional identifier for this callback. The default name\n"
62 " is 'python.<module>.<name>'. If 'name' contains a '.' it\n"
63 " replaces both module and name, otherwise it replaces only name.\n"
64 " Every callback needs a unique identifier, so if you want to\n"
65 " register one function multiple time you need to specify a name\n"
67 "'identifier' is the full identifier assigned to this callback.\n"
69 "The callback function will be called without parameters, except for\n"
70 "data if it was supplied.";
72 static char reg_config_doc[] = "register_config(callback[, data][, name]) -> identifier\n"
74 "Register a callback function for config file entries.\n"
75 "'callback' is a callable object that will be called for every config block.\n"
76 "'data' is an optional object that will be passed back to the callback\n"
77 " function every time it is called.\n"
78 "'name' is an optional identifier for this callback. The default name\n"
79 " is 'python.<module>'. Every callback needs a unique identifier,\n"
80 " so if you want to register one function multiple time you need to\n"
81 " specify a name here.\n"
82 "'identifier' is the full identifier assigned to this callback.\n"
84 "The callback function will be called with one or two parameters:\n"
85 "config: A Config object.\n"
86 "data: The optional data parameter passed to the register function.\n"
87 " If the parameter was obmitted it will be obmitted here, too.";
89 static char reg_read_doc[] = "register_read(callback[, interval][, data][, name]) -> identifier\n"
91 "Register a callback function for reading data. It will just be called\n"
92 "in a fixed interval to signal that it's time to dispatch new values.\n"
93 "'callback' is a callable object that will be called every time something\n"
95 "'interval' is the number of seconds between between calls to the callback\n"
96 " function. Full float precision is supported here.\n"
97 "'data' is an optional object that will be passed back to the callback\n"
98 " function every time it is called.\n"
99 "'name' is an optional identifier for this callback. The default name\n"
100 " is 'python.<module>.<name>'. If 'name' contains a '.' it\n"
101 " replaces both module and name, otherwise it replaces only name.\n"
102 " Every callback needs a unique identifier, so if you want to\n"
103 " register one function multiple time you need to specify a name\n"
105 "'identifier' is the full identifier assigned to this callback.\n"
107 "The callback function will be called without parameters, except for\n"
108 "data if it was supplied.";
110 static char reg_write_doc[] = "register_write(callback[, data][, name]) -> identifier\n"
112 "Register a callback function to receive values dispatched by other plugins.\n"
113 "'callback' is a callable object that will be called every time a value\n"
115 "'data' is an optional object that will be passed back to the callback\n"
116 " function every time it is called.\n"
117 "'name' is an optional identifier for this callback. The default name\n"
118 " is 'python.<module>.<name>'. If 'name' contains a '.' it\n"
119 " replaces both module and name, otherwise it replaces only name.\n"
120 " Every callback needs a unique identifier, so if you want to\n"
121 " register one function multiple time you need to specify a name\n"
123 "'identifier' is the full identifier assigned to this callback.\n"
125 "The callback function will be called with one or two parameters:\n"
126 "values: A Values object which is a copy of the dispatched values.\n"
127 "data: The optional data parameter passed to the register function.\n"
128 " If the parameter was obmitted it will be obmitted here, too.";
130 static char reg_notification_doc[] = "register_notification(callback[, data][, name]) -> identifier\n"
132 "Register a callback function for notifications.\n"
133 "'callback' is a callable object that will be called every time a notification\n"
135 "'data' is an optional object that will be passed back to the callback\n"
136 " function every time it is called.\n"
137 "'name' is an optional identifier for this callback. The default name\n"
138 " is 'python.<module>.<name>'. If 'name' contains a '.' it\n"
139 " replaces both module and name, otherwise it replaces only name.\n"
140 " Every callback needs a unique identifier, so if you want to\n"
141 " register one function multiple time you need to specify a name\n"
143 "'identifier' is the full identifier assigned to this callback.\n"
145 "The callback function will be called with one or two parameters:\n"
146 "notification: A copy of the notification that was dispatched.\n"
147 "data: The optional data parameter passed to the register function.\n"
148 " If the parameter was obmitted it will be obmitted here, too.";
150 static char reg_flush_doc[] = "register_flush(callback[, data][, name]) -> identifier\n"
152 "Register a callback function for flush messages.\n"
153 "'callback' is a callable object that will be called every time a plugin\n"
154 " requests a flush for either this or all plugins.\n"
155 "'data' is an optional object that will be passed back to the callback\n"
156 " function every time it is called.\n"
157 "'name' is an optional identifier for this callback. The default name\n"
158 " is 'python.<module>'. Every callback needs a unique identifier,\n"
159 " so if you want to register one function multiple time you need to\n"
160 " specify a name here.\n"
161 "'identifier' is the full identifier assigned to this callback.\n"
163 "The callback function will be called with two or three parameters:\n"
166 "data: The optional data parameter passed to the register function.\n"
167 " If the parameter was obmitted it will be obmitted here, too.";
169 static char reg_shutdown_doc[] = "register_shutdown(callback[, data][, name]) -> identifier\n"
171 "Register a callback function for collectd shutdown.\n"
172 "'callback' is a callable object that will be called once collectd is\n"
174 "'data' is an optional object that will be passed back to the callback\n"
175 " function if it is called.\n"
176 "'name' is an optional identifier for this callback. The default name\n"
177 " is 'python.<module>.<name>'. If 'name' contains a '.' it\n"
178 " replaces both module and name, otherwise it replaces only name.\n"
179 " Every callback needs a unique identifier, so if you want to\n"
180 " register one function multiple time you need to specify a name\n"
182 "'identifier' is the full identifier assigned to this callback.\n"
184 "The callback function will be called with no parameters except for\n"
185 " data if it was supplied.";
188 static int do_interactive = 0;
190 /* This is our global thread state. Python saves some stuff in thread-local
191 * storage. So if we allow the interpreter to run in the background
192 * (the scriptwriters might have created some threads from python), we have
193 * to save the state so we can resume it later after shutdown. */
195 static PyThreadState *state;
197 static PyObject *cpy_format_exception;
199 static cpy_callback_t *cpy_config_callbacks;
200 static cpy_callback_t *cpy_init_callbacks;
201 static cpy_callback_t *cpy_shutdown_callbacks;
203 static void cpy_destroy_user_data(void *data) {
204 cpy_callback_t *c = data;
206 Py_DECREF(c->callback);
211 /* You must hold the GIL to call this function!
212 * But if you managed to extract the callback parameter then you probably already do. */
214 static void cpy_build_name(char *buf, size_t size, PyObject *callback, const char *name, int short_name) {
216 PyObject *mod = NULL, *n = NULL;
218 if (name != NULL && (strchr(name, '.') != NULL || short_name)) {
219 snprintf(buf, size, "python.%s", name);
223 mod = PyObject_GetAttrString(callback, "__module__"); /* New reference. */
225 module = PyString_AsString(mod);
230 snprintf(buf, size, "python.%s", module);
236 snprintf(buf, size, "python.%s.%s", module, name);
241 n = PyObject_GetAttrString(callback, "__name__"); /* New reference. */
243 name = PyString_AsString(n);
246 snprintf(buf, size, "python.%s.%s", module, name);
248 snprintf(buf, size, "python.%s.%p", module, callback);
253 static void cpy_log_exception(const char *context) {
255 const char *typename = NULL, *message = NULL;
256 PyObject *type, *value, *traceback, *tn, *m, *list;
258 PyErr_Fetch(&type, &value, &traceback);
259 PyErr_NormalizeException(&type, &value, &traceback);
260 if (type == NULL) return;
261 tn = PyObject_GetAttrString(type, "__name__"); /* New reference. */
262 m = PyObject_GetAttrString(value, "message"); /* New reference. */
264 typename = PyString_AsString(tn);
266 message = PyString_AsString(m);
267 if (typename == NULL)
268 typename = "NamelessException";
271 Py_BEGIN_ALLOW_THREADS
272 ERROR("Unhandled python exception in %s: %s: %s", context, typename, message);
276 if (!cpy_format_exception) {
280 Py_XDECREF(traceback);
287 list = PyObject_CallFunction(cpy_format_exception, "NNN", type, value, traceback); /* New reference. */
289 l = PyObject_Length(list);
290 for (i = 0; i < l; ++i) {
294 line = PyList_GET_ITEM(list, i); /* Borrowed reference. */
295 s = strdup(PyString_AsString(line));
297 if (s[strlen(s) - 1] == '\n')
298 s[strlen(s) - 1] = 0;
299 Py_BEGIN_ALLOW_THREADS
308 static int cpy_read_callback(user_data_t *data) {
309 cpy_callback_t *c = data->data;
313 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
315 cpy_log_exception("read callback");
325 static int cpy_write_callback(const data_set_t *ds, const value_list_t *value_list, user_data_t *data) {
327 cpy_callback_t *c = data->data;
328 PyObject *ret, *v, *list;
331 list = PyList_New(value_list->values_len); /* New reference. */
333 cpy_log_exception("write callback");
334 CPY_RETURN_FROM_THREADS 0;
336 for (i = 0; i < value_list->values_len; ++i) {
337 if (ds->ds->type == DS_TYPE_COUNTER) {
338 if ((long) value_list->values[i].counter == value_list->values[i].counter)
339 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].counter));
341 PyList_SetItem(list, i, PyLong_FromUnsignedLongLong(value_list->values[i].counter));
342 } else if (ds->ds->type == DS_TYPE_GAUGE) {
343 PyList_SetItem(list, i, PyFloat_FromDouble(value_list->values[i].gauge));
344 } else if (ds->ds->type == DS_TYPE_DERIVE) {
345 if ((long) value_list->values[i].derive == value_list->values[i].derive)
346 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].derive));
348 PyList_SetItem(list, i, PyLong_FromLongLong(value_list->values[i].derive));
349 } else if (ds->ds->type == DS_TYPE_ABSOLUTE) {
350 if ((long) value_list->values[i].absolute == value_list->values[i].absolute)
351 PyList_SetItem(list, i, PyInt_FromLong(value_list->values[i].absolute));
353 PyList_SetItem(list, i, PyLong_FromUnsignedLongLong(value_list->values[i].absolute));
355 Py_BEGIN_ALLOW_THREADS
356 ERROR("cpy_write_callback: Unknown value type %d.", ds->ds->type);
359 CPY_RETURN_FROM_THREADS 0;
361 if (PyErr_Occurred() != NULL) {
362 cpy_log_exception("value building for write callback");
363 CPY_RETURN_FROM_THREADS 0;
366 v = PyObject_CallFunction((PyObject *) &ValuesType, "sOssssdi", value_list->type, list,
367 value_list->plugin_instance, value_list->type_instance, value_list->plugin,
368 value_list->host, (double) value_list->time, value_list->interval);
370 ret = PyObject_CallFunctionObjArgs(c->callback, v, c->data, (void *) 0); /* New reference. */
372 cpy_log_exception("write callback");
380 static int cpy_notification_callback(const notification_t *notification, user_data_t *data) {
381 cpy_callback_t *c = data->data;
385 n = PyObject_CallFunction((PyObject *) &NotificationType, "ssssssdi", notification->type, notification->message,
386 notification->plugin_instance, notification->type_instance, notification->plugin,
387 notification->host, (double) notification->time, notification->severity);
388 ret = PyObject_CallFunctionObjArgs(c->callback, n, c->data, (void *) 0); /* New reference. */
390 cpy_log_exception("notification callback");
398 static void cpy_log_callback(int severity, const char *message, user_data_t *data) {
399 cpy_callback_t * c = data->data;
404 ret = PyObject_CallFunction(c->callback, "is", severity, message); /* New reference. */
406 ret = PyObject_CallFunction(c->callback, "isO", severity, message, c->data); /* New reference. */
410 /* Do we really want to trigger a log callback because a log callback failed?
419 static void cpy_flush_callback(int timeout, const char *id, user_data_t *data) {
420 cpy_callback_t * c = data->data;
425 ret = PyObject_CallFunction(c->callback, "is", timeout, id); /* New reference. */
427 ret = PyObject_CallFunction(c->callback, "isO", timeout, id, c->data); /* New reference. */
430 cpy_log_exception("flush callback");
437 static PyObject *cpy_register_generic(cpy_callback_t **list_head, PyObject *args, PyObject *kwds, int short_name) {
440 const char *name = NULL;
441 PyObject *callback = NULL, *data = NULL, *mod = NULL;
442 static char *kwlist[] = {"callback", "data", "name", NULL};
444 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oz", kwlist, &callback, &data, &name) == 0) return NULL;
445 if (PyCallable_Check(callback) == 0) {
446 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
449 cpy_build_name(buf, sizeof(buf), callback, name, short_name);
453 c = malloc(sizeof(*c));
454 c->name = strdup(buf);
455 c->callback = callback;
457 c->next = *list_head;
460 return PyString_FromString(buf);
463 static PyObject *cpy_flush(cpy_callback_t **list_head, PyObject *args, PyObject *kwds) {
465 const char *plugin = NULL, *identifier = NULL;
466 static char *kwlist[] = {"plugin", "timeout", "identifier", NULL};
468 if (PyArg_ParseTupleAndKeywords(args, kwds, "|ziz", kwlist, &plugin, &timeout, &identifier) == 0) return NULL;
469 Py_BEGIN_ALLOW_THREADS
470 plugin_flush(plugin, timeout, identifier);
475 static PyObject *cpy_register_config(PyObject *self, PyObject *args, PyObject *kwds) {
476 return cpy_register_generic(&cpy_config_callbacks, args, kwds, 1);
479 static PyObject *cpy_register_init(PyObject *self, PyObject *args, PyObject *kwds) {
480 return cpy_register_generic(&cpy_init_callbacks, args, kwds, 0);
483 typedef int reg_function_t(const char *name, void *callback, void *data);
485 static PyObject *cpy_register_generic_userdata(void *reg, void *handler, PyObject *args, PyObject *kwds, int short_name) {
487 reg_function_t *register_function = (reg_function_t *) reg;
488 cpy_callback_t *c = NULL;
489 user_data_t *user_data = NULL;
490 const char *name = NULL;
491 PyObject *callback = NULL, *data = NULL;
492 static char *kwlist[] = {"callback", "data", "name", NULL};
494 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|Oz", kwlist, &callback, &data, &name) == 0) return NULL;
495 if (PyCallable_Check(callback) == 0) {
496 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
499 cpy_build_name(buf, sizeof(buf), callback, name, short_name);
503 c = malloc(sizeof(*c));
504 c->name = strdup(buf);
505 c->callback = callback;
508 user_data = malloc(sizeof(*user_data));
509 user_data->free_func = cpy_destroy_user_data;
511 register_function(buf, handler, user_data);
512 return PyString_FromString(buf);
515 static PyObject *cpy_register_read(PyObject *self, PyObject *args, PyObject *kwds) {
517 cpy_callback_t *c = NULL;
518 user_data_t *user_data = NULL;
520 const char *name = NULL;
521 PyObject *callback = NULL, *data = NULL;
523 static char *kwlist[] = {"callback", "interval", "data", "name", NULL};
525 if (PyArg_ParseTupleAndKeywords(args, kwds, "O|dOz", kwlist, &callback, &interval, &data, &name) == 0) return NULL;
526 if (PyCallable_Check(callback) == 0) {
527 PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
530 cpy_build_name(buf, sizeof(buf), callback, name, 0);
534 c = malloc(sizeof(*c));
535 c->name = strdup(buf);
536 c->callback = callback;
539 user_data = malloc(sizeof(*user_data));
540 user_data->free_func = cpy_destroy_user_data;
542 ts.tv_sec = interval;
543 ts.tv_nsec = (interval - ts.tv_sec) * 1000000000;
544 plugin_register_complex_read(buf, cpy_read_callback, &ts, user_data);
545 return PyString_FromString(buf);
548 static PyObject *cpy_register_log(PyObject *self, PyObject *args, PyObject *kwds) {
549 return cpy_register_generic_userdata(plugin_register_log, cpy_log_callback, args, kwds, 0);
552 static PyObject *cpy_register_write(PyObject *self, PyObject *args, PyObject *kwds) {
553 return cpy_register_generic_userdata(plugin_register_write, cpy_write_callback, args, kwds, 0);
556 static PyObject *cpy_register_notification(PyObject *self, PyObject *args, PyObject *kwds) {
557 return cpy_register_generic_userdata(plugin_register_notification, cpy_notification_callback, args, kwds, 0);
560 static PyObject *cpy_register_flush(PyObject *self, PyObject *args, PyObject *kwds) {
561 return cpy_register_generic_userdata(plugin_register_flush, cpy_flush_callback, args, kwds, 1);
564 static PyObject *cpy_register_shutdown(PyObject *self, PyObject *args, PyObject *kwds) {
565 return cpy_register_generic(&cpy_shutdown_callbacks, args, kwds, 0);
568 static PyObject *cpy_error(PyObject *self, PyObject *args) {
570 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
571 Py_BEGIN_ALLOW_THREADS
572 plugin_log(LOG_ERR, "%s", text);
577 static PyObject *cpy_warning(PyObject *self, PyObject *args) {
579 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
580 Py_BEGIN_ALLOW_THREADS
581 plugin_log(LOG_WARNING, "%s", text);
586 static PyObject *cpy_notice(PyObject *self, PyObject *args) {
588 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
589 Py_BEGIN_ALLOW_THREADS
590 plugin_log(LOG_NOTICE, "%s", text);
595 static PyObject *cpy_info(PyObject *self, PyObject *args) {
597 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
598 Py_BEGIN_ALLOW_THREADS
599 plugin_log(LOG_INFO, "%s", text);
604 static PyObject *cpy_debug(PyObject *self, PyObject *args) {
607 if (PyArg_ParseTuple(args, "s", &text) == 0) return NULL;
608 Py_BEGIN_ALLOW_THREADS
609 plugin_log(LOG_DEBUG, "%s", text);
615 static PyObject *cpy_unregister_generic(cpy_callback_t **list_head, PyObject *arg, const char *desc, int short_name) {
618 cpy_callback_t *prev = NULL, *tmp;
620 if (PyString_Check(arg)) {
621 name = PyString_AsString(arg);
623 if (!PyCallable_Check(arg)) {
624 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
627 cpy_build_name(buf, sizeof(buf), arg, NULL, short_name);
630 for (tmp = *list_head; tmp; prev = tmp, tmp = tmp->next)
631 if (strcmp(name, tmp->name) == 0)
635 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
638 /* Yes, this is actually save. To call this function the calles has to
639 * hold the GIL. Well, save as long as there is only one GIL anyway ... */
641 *list_head = tmp->next;
643 prev->next = tmp->next;
644 cpy_destroy_user_data(tmp);
648 typedef int cpy_unregister_function_t(const char *name);
650 static PyObject *cpy_unregister_generic_userdata(cpy_unregister_function_t *unreg, PyObject *arg, const char *desc, int short_name) {
654 if (PyString_Check(arg)) {
655 name = PyString_AsString(arg);
657 if (!PyCallable_Check(arg)) {
658 PyErr_SetString(PyExc_TypeError, "This function needs a string or a callable object as its only parameter.");
661 cpy_build_name(buf, sizeof(buf), arg, NULL, short_name);
664 if (unreg(name) == 0)
666 PyErr_Format(PyExc_RuntimeError, "Unable to unregister %s callback '%s'.", desc, name);
670 static PyObject *cpy_unregister_log(PyObject *self, PyObject *arg) {
671 return cpy_unregister_generic_userdata(plugin_unregister_log, arg, "log", 0);
674 static PyObject *cpy_unregister_init(PyObject *self, PyObject *arg) {
675 return cpy_unregister_generic(&cpy_init_callbacks, arg, "init", 0);
678 static PyObject *cpy_unregister_config(PyObject *self, PyObject *arg) {
679 return cpy_unregister_generic(&cpy_config_callbacks, arg, "config", 1);
682 static PyObject *cpy_unregister_read(PyObject *self, PyObject *arg) {
683 return cpy_unregister_generic_userdata(plugin_unregister_read, arg, "read", 0);
686 static PyObject *cpy_unregister_write(PyObject *self, PyObject *arg) {
687 return cpy_unregister_generic_userdata(plugin_unregister_write, arg, "write", 0);
690 static PyObject *cpy_unregister_notification(PyObject *self, PyObject *arg) {
691 return cpy_unregister_generic_userdata(plugin_unregister_notification, arg, "notification", 0);
694 static PyObject *cpy_unregister_flush(PyObject *self, PyObject *arg) {
695 return cpy_unregister_generic_userdata(plugin_unregister_flush, arg, "flush", 1);
698 static PyObject *cpy_unregister_shutdown(PyObject *self, PyObject *arg) {
699 return cpy_unregister_generic(&cpy_shutdown_callbacks, arg, "shutdown", 0);
702 static PyMethodDef cpy_methods[] = {
703 {"debug", cpy_debug, METH_VARARGS, log_doc},
704 {"info", cpy_info, METH_VARARGS, log_doc},
705 {"notice", cpy_notice, METH_VARARGS, log_doc},
706 {"warning", cpy_warning, METH_VARARGS, log_doc},
707 {"error", cpy_error, METH_VARARGS, log_doc},
708 {"flush", (PyCFunction) cpy_flush, METH_VARARGS | METH_KEYWORDS, flush_doc},
709 {"register_log", (PyCFunction) cpy_register_log, METH_VARARGS | METH_KEYWORDS, reg_log_doc},
710 {"register_init", (PyCFunction) cpy_register_init, METH_VARARGS | METH_KEYWORDS, reg_init_doc},
711 {"register_config", (PyCFunction) cpy_register_config, METH_VARARGS | METH_KEYWORDS, reg_config_doc},
712 {"register_read", (PyCFunction) cpy_register_read, METH_VARARGS | METH_KEYWORDS, reg_read_doc},
713 {"register_write", (PyCFunction) cpy_register_write, METH_VARARGS | METH_KEYWORDS, reg_write_doc},
714 {"register_notification", (PyCFunction) cpy_register_notification, METH_VARARGS | METH_KEYWORDS, reg_notification_doc},
715 {"register_flush", (PyCFunction) cpy_register_flush, METH_VARARGS | METH_KEYWORDS, reg_flush_doc},
716 {"register_shutdown", (PyCFunction) cpy_register_shutdown, METH_VARARGS | METH_KEYWORDS, reg_shutdown_doc},
717 {"unregister_log", cpy_unregister_log, METH_O, unregister_doc},
718 {"unregister_init", cpy_unregister_init, METH_O, unregister_doc},
719 {"unregister_config", cpy_unregister_config, METH_O, unregister_doc},
720 {"unregister_read", cpy_unregister_read, METH_O, unregister_doc},
721 {"unregister_write", cpy_unregister_write, METH_O, unregister_doc},
722 {"unregister_notification", cpy_unregister_notification, METH_O, unregister_doc},
723 {"unregister_flush", cpy_unregister_flush, METH_O, unregister_doc},
724 {"unregister_shutdown", cpy_unregister_shutdown, METH_O, unregister_doc},
728 static int cpy_shutdown(void) {
732 /* This can happen if the module was loaded but not configured. */
734 PyEval_RestoreThread(state);
736 for (c = cpy_shutdown_callbacks; c; c = c->next) {
737 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
739 cpy_log_exception("shutdown callback");
748 static void cpy_int_handler(int sig) {
752 static void *cpy_interactive(void *data) {
754 struct sigaction sig_int_action, old;
756 /* Signal handler in a plugin? Bad stuff, but the best way to
757 * handle it I guess. In an interactive session people will
758 * press Ctrl+C at some time, which will generate a SIGINT.
759 * This will cause collectd to shutdown, thus killing the
760 * interactive interpreter, and leaving the terminal in a
761 * mess. Chances are, this isn't what the user wanted to do.
763 * So this is the plan:
764 * 1. Block SIGINT in the main thread.
765 * 2. Install our own signal handler that does nothing.
766 * 3. Unblock SIGINT in the interactive thread.
768 * This will make sure that SIGINT won't kill collectd but
769 * still interrupt syscalls like sleep and pause.
770 * It does not raise a KeyboardInterrupt exception because so
771 * far nobody managed to figure out how to do that. */
772 memset (&sig_int_action, '\0', sizeof (sig_int_action));
773 sig_int_action.sa_handler = cpy_int_handler;
774 sigaction (SIGINT, &sig_int_action, &old);
776 sigemptyset(&sigset);
777 sigaddset(&sigset, SIGINT);
778 pthread_sigmask(SIG_UNBLOCK, &sigset, NULL);
779 PyEval_AcquireThread(state);
780 if (PyImport_ImportModule("readline") == NULL) {
781 /* This interactive session will suck. */
782 cpy_log_exception("interactive session init");
784 PyRun_InteractiveLoop(stdin, "<stdin>");
786 PyEval_ReleaseThread(state);
787 NOTICE("python: Interactive interpreter exited, stopping collectd ...");
788 /* Restore the original collectd SIGINT handler and raise SIGINT.
789 * The main thread still has SIGINT blocked and there's nothing we
790 * can do about that so this thread will handle it. But that's not
791 * important, except that it won't interrupt the main loop and so
792 * it might take a few seconds before collectd really shuts down. */
793 sigaction (SIGINT, &old, NULL);
799 static int cpy_init(void) {
802 static pthread_t thread;
805 PyEval_InitThreads();
806 /* Now it's finally OK to use python threads. */
807 for (c = cpy_init_callbacks; c; c = c->next) {
808 ret = PyObject_CallFunctionObjArgs(c->callback, c->data, (void *) 0); /* New reference. */
810 cpy_log_exception("init callback");
814 sigemptyset(&sigset);
815 sigaddset(&sigset, SIGINT);
816 pthread_sigmask(SIG_BLOCK, &sigset, NULL);
817 state = PyEval_SaveThread();
818 if (do_interactive) {
819 if (pthread_create(&thread, NULL, cpy_interactive, NULL)) {
820 ERROR("python: Error creating thread for interactive interpreter.");
827 static PyObject *cpy_oconfig_to_pyconfig(oconfig_item_t *ci, PyObject *parent) {
829 PyObject *item, *values, *children, *tmp;
834 values = PyTuple_New(ci->values_num); /* New reference. */
835 for (i = 0; i < ci->values_num; ++i) {
836 if (ci->values[i].type == OCONFIG_TYPE_STRING) {
837 PyTuple_SET_ITEM(values, i, PyString_FromString(ci->values[i].value.string));
838 } else if (ci->values[i].type == OCONFIG_TYPE_NUMBER) {
839 PyTuple_SET_ITEM(values, i, PyFloat_FromDouble(ci->values[i].value.number));
840 } else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN) {
841 PyTuple_SET_ITEM(values, i, PyBool_FromLong(ci->values[i].value.boolean));
845 item = PyObject_CallFunction((PyObject *) &ConfigType, "sONO", ci->key, parent, values, Py_None);
848 children = PyTuple_New(ci->children_num); /* New reference. */
849 for (i = 0; i < ci->children_num; ++i) {
850 PyTuple_SET_ITEM(children, i, cpy_oconfig_to_pyconfig(ci->children + i, item));
852 tmp = ((Config *) item)->children;
853 ((Config *) item)->children = children;
858 static int cpy_config(oconfig_item_t *ci) {
864 /* Ok in theory we shouldn't do initialization at this point
865 * but we have to. In order to give python scripts a chance
866 * to register a config callback we need to be able to execute
867 * python code during the config callback so we have to start
868 * the interpreter here. */
869 /* Do *not* use the python "thread" module at this point! */
872 PyType_Ready(&ConfigType);
873 PyType_Ready(&PluginDataType);
874 ValuesType.tp_base = &PluginDataType;
875 PyType_Ready(&ValuesType);
876 NotificationType.tp_base = &PluginDataType;
877 PyType_Ready(&NotificationType);
878 sys = PyImport_ImportModule("sys"); /* New reference. */
880 cpy_log_exception("python initialization");
883 sys_path = PyObject_GetAttrString(sys, "path"); /* New reference. */
885 if (sys_path == NULL) {
886 cpy_log_exception("python initialization");
889 module = Py_InitModule("collectd", cpy_methods); /* Borrowed reference. */
890 PyModule_AddObject(module, "Config", (PyObject *) &ConfigType); /* Steals a reference. */
891 PyModule_AddObject(module, "Values", (PyObject *) &ValuesType); /* Steals a reference. */
892 PyModule_AddObject(module, "Notification", (PyObject *) &NotificationType); /* Steals a reference. */
893 PyModule_AddIntConstant(module, "LOG_DEBUG", LOG_DEBUG);
894 PyModule_AddIntConstant(module, "LOG_INFO", LOG_INFO);
895 PyModule_AddIntConstant(module, "LOG_NOTICE", LOG_NOTICE);
896 PyModule_AddIntConstant(module, "LOG_WARNING", LOG_WARNING);
897 PyModule_AddIntConstant(module, "LOG_ERROR", LOG_ERR);
898 PyModule_AddIntConstant(module, "NOTIF_FAILURE", NOTIF_FAILURE);
899 PyModule_AddIntConstant(module, "NOTIF_WARNING", NOTIF_WARNING);
900 PyModule_AddIntConstant(module, "NOTIF_OKAY", NOTIF_OKAY);
901 for (i = 0; i < ci->children_num; ++i) {
902 oconfig_item_t *item = ci->children + i;
904 if (strcasecmp(item->key, "Interactive") == 0) {
905 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
907 do_interactive = item->values[0].value.boolean;
908 } else if (strcasecmp(item->key, "LogTraces") == 0) {
909 if (item->values_num != 1 || item->values[0].type != OCONFIG_TYPE_BOOLEAN)
911 if (!item->values[0].value.boolean) {
912 Py_XDECREF(cpy_format_exception);
913 cpy_format_exception = NULL;
916 if (cpy_format_exception)
918 tb = PyImport_ImportModule("traceback"); /* New reference. */
920 cpy_log_exception("python initialization");
923 cpy_format_exception = PyObject_GetAttrString(tb, "format_exception"); /* New reference. */
925 if (cpy_format_exception == NULL)
926 cpy_log_exception("python initialization");
927 } else if (strcasecmp(item->key, "ModulePath") == 0) {
929 PyObject *dir_object;
931 if (cf_util_get_string(item, &dir) != 0)
933 dir_object = PyString_FromString(dir); /* New reference. */
934 if (dir_object == NULL) {
935 ERROR("python plugin: Unable to convert \"%s\" to "
936 "a python object.", dir);
938 cpy_log_exception("python initialization");
941 if (PyList_Append(sys_path, dir_object) != 0) {
942 ERROR("python plugin: Unable to append \"%s\" to "
943 "python module path.", dir);
944 cpy_log_exception("python initialization");
946 Py_DECREF(dir_object);
948 } else if (strcasecmp(item->key, "Import") == 0) {
949 char *module_name = NULL;
952 if (cf_util_get_string(item, &module_name) != 0)
954 module = PyImport_ImportModule(module_name); /* New reference. */
955 if (module == NULL) {
956 ERROR("python plugin: Error importing module \"%s\".", module_name);
957 cpy_log_exception("importing module");
962 } else if (strcasecmp(item->key, "Module") == 0) {
967 if (cf_util_get_string(item, &name) != 0)
969 for (c = cpy_config_callbacks; c; c = c->next) {
970 if (strcasecmp(c->name + 7, name) == 0)
974 WARNING("python plugin: Found a configuration for the \"%s\" plugin, "
975 "but the plugin isn't loaded or didn't register "
976 "a configuration callback.", name);
982 ret = PyObject_CallFunction(c->callback, "N",
983 cpy_oconfig_to_pyconfig(item, NULL)); /* New reference. */
985 ret = PyObject_CallFunction(c->callback, "NO",
986 cpy_oconfig_to_pyconfig(item, NULL), c->data); /* New reference. */
988 cpy_log_exception("loading module");
992 WARNING("python plugin: Ignoring unknown config key \"%s\".", item->key);
999 void module_register(void) {
1000 plugin_register_complex_config("python", cpy_config);
1001 plugin_register_init("python", cpy_init);
1002 plugin_register_shutdown("python", cpy_shutdown);