--- /dev/null
+#include <Python.h>
+#include <structmember.h>
+
+#include "collectd.h"
+#include "common.h"
+
+typedef struct cpy_callback_s {
+ char *name;
+ PyObject *callback;
+ struct cpy_callback_s *next;
+} cpy_callback_t;
+
+/* This is our global thread state. Python saves some stuff in thread-local
+ * storage. So if we allow the interpreter to run in the background
+ * (the scriptwriters might have created some threads from python), we have
+ * to save the state so we can resume it later from a different thread.
+
+ * Technically the Global Interpreter Lock (GIL) and thread states can be
+ * manipulated independently. But to keep stuff from getting too complex
+ * we'll just use PyEval_SaveTread and PyEval_RestoreThreas which takes
+ * care of the thread states as well as the GIL. */
+
+static PyThreadState *state;
+
+static cpy_callback_t *cpy_config_callbacks;
+
+typedef struct {
+ PyObject_HEAD /* No semicolon! */
+ PyObject *parent;
+ PyObject *key;
+ PyObject *values;
+ PyObject *children;
+} Config;
+
+static void Config_dealloc(PyObject *s) {
+ Config *self = (Config *) s;
+
+ Py_XDECREF(self->parent);
+ Py_XDECREF(self->key);
+ Py_XDECREF(self->values);
+ Py_XDECREF(self->children);
+ self->ob_type->tp_free(s);
+}
+
+static PyObject *Config_new(PyTypeObject *type, PyObject *args, PyObject *kwds) {
+ Config *self;
+
+ self = (Config *) type->tp_alloc(type, 0);
+ if (self == NULL)
+ return NULL;
+
+ self->parent = NULL;
+ self->key = NULL;
+ self->values = NULL;
+ self->children = NULL;
+ return (PyObject *) self;
+}
+
+static int Config_init(PyObject *s, PyObject *args, PyObject *kwds) {
+ PyObject *key = NULL, *parent = NULL, *values = NULL, *children = NULL, *tmp;
+ Config *self = (Config *) s;
+ static char *kwlist[] = {"key", "parent", "values", "children", NULL};
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, "S|OOO", kwlist,
+ &key, &parent, &values, &children))
+ return -1;
+
+ if (values == NULL) {
+ values = PyTuple_New(0);
+ PyErr_Clear();
+ }
+ if (children == NULL) {
+ children = PyTuple_New(0);
+ PyErr_Clear();
+ }
+ tmp = self->key;
+ Py_INCREF(key);
+ self->key = key;
+ Py_XDECREF(tmp);
+ if (parent != NULL) {
+ tmp = self->parent;
+ Py_INCREF(parent);
+ self->parent = parent;
+ Py_XDECREF(tmp);
+ }
+ if (values != NULL) {
+ tmp = self->values;
+ Py_INCREF(values);
+ self->values = values;
+ Py_XDECREF(tmp);
+ }
+ if (children != NULL) {
+ tmp = self->children;
+ Py_INCREF(children);
+ self->children = children;
+ Py_XDECREF(tmp);
+ }
+ return 0;
+}
+
+static PyMemberDef Config_members[] = {
+ {"Parent", T_OBJECT, offsetof(Config, parent), 0, "Parent node"},
+ {"Key", T_OBJECT_EX, offsetof(Config, key), 0, "Keyword of this node"},
+ {"Values", T_OBJECT_EX, offsetof(Config, values), 0, "Values after the key"},
+ {"Children", T_OBJECT_EX, offsetof(Config, children), 0, "Childnodes of this node"},
+ {NULL}
+};
+
+static PyTypeObject ConfigType = {
+ PyObject_HEAD_INIT(NULL)
+ 0, /* Always 0 */
+ "collectd.Config", /* tp_name */
+ sizeof(Config), /* tp_basicsize */
+ 0, /* Will be filled in later */
+ Config_dealloc, /* tp_dealloc */
+ 0, /* tp_print */
+ 0, /* tp_getattr */
+ 0, /* tp_setattr */
+ 0, /* tp_compare */
+ 0, /* tp_repr */
+ 0, /* tp_as_number */
+ 0, /* tp_as_sequence */
+ 0, /* tp_as_mapping */
+ 0, /* tp_hash */
+ 0, /* tp_call */
+ 0, /* tp_str */
+ 0, /* tp_getattro */
+ 0, /* tp_setattro */
+ 0, /* tp_as_buffer */
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+ "Cool help text later", /* tp_doc */
+ 0, /* tp_traverse */
+ 0, /* tp_clear */
+ 0, /* tp_richcompare */
+ 0, /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ 0, /* tp_methods */
+ Config_members, /* tp_members */
+ 0, /* tp_getset */
+ 0, /* tp_base */
+ 0, /* tp_dict */
+ 0, /* tp_descr_get */
+ 0, /* tp_descr_set */
+ 0, /* tp_dictoffset */
+ Config_init, /* tp_init */
+ 0, /* tp_alloc */
+ Config_new /* tp_new */
+};
+
+static PyObject *cpy_register_config(PyObject *self, PyObject *args) {
+ cpy_callback_t *c;
+ const char *name = NULL;
+ PyObject *callback = NULL;
+
+ if (PyArg_ParseTuple(args, "O|z", &callback, &name) == 0) return NULL;
+ if (PyCallable_Check(callback) == 0) {
+ PyErr_SetString(PyExc_TypeError, "callback needs a be a callable object.");
+ return 0;
+ }
+ if (name == NULL) {
+ PyObject *mod;
+
+ mod = PyObject_GetAttrString(callback, "__module__");
+ if (mod != NULL) name = PyString_AsString(mod);
+ if (name == NULL) {
+ PyErr_SetString(PyExc_ValueError, "No module name specified and "
+ "callback function does not have a \"__module__\" attribute.");
+ return 0;
+ }
+ }
+ c = malloc(sizeof(*c));
+ c->name = strdup(name);
+ c->callback = callback;
+ c->next = cpy_config_callbacks;
+ cpy_config_callbacks = c;
+ return Py_None;
+}
+
+static PyMethodDef cpy_methods[] = {
+ {"register_config", cpy_register_config, METH_VARARGS, "foo"},
+ {0, 0, 0, 0}
+};
+
+static int cpy_shutdown(void) {
+ /* This can happen if the module was loaded but not configured. */
+ if (state != NULL)
+ PyEval_RestoreThread(state);
+ Py_Finalize();
+ return 0;
+}
+
+static int cpy_init(void) {
+ PyEval_InitThreads();
+ /* Now it's finally OK to use python threads. */
+ return 0;
+}
+
+static PyObject *cpy_oconfig_to_pyconfig(oconfig_item_t *ci, PyObject *parent) {
+ int i;
+ PyObject *item, *values, *children, *tmp;
+
+ if (parent == NULL)
+ parent = Py_None;
+
+ values = PyTuple_New(ci->values_num); /* New reference. */
+ for (i = 0; i < ci->values_num; ++i) {
+ if (ci->values[i].type == OCONFIG_TYPE_STRING) {
+ PyTuple_SET_ITEM(values, i, PyString_FromString(ci->values[i].value.string));
+ } else if (ci->values[i].type == OCONFIG_TYPE_NUMBER) {
+ PyTuple_SET_ITEM(values, i, PyFloat_FromDouble(ci->values[i].value.number));
+ } else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN) {
+ PyTuple_SET_ITEM(values, i, PyBool_FromLong(ci->values[i].value.boolean));
+ }
+ }
+
+ item = PyObject_CallFunction((PyObject *) &ConfigType, "sONO", ci->key, parent, values, Py_None);
+ if (item == NULL)
+ return NULL;
+ children = PyTuple_New(ci->children_num); /* New reference. */
+ for (i = 0; i < ci->children_num; ++i) {
+ PyTuple_SET_ITEM(children, i, cpy_oconfig_to_pyconfig(ci->children + i, item));
+ }
+ tmp = ((Config *) item)->children;
+ ((Config *) item)->children = children;
+ Py_XDECREF(tmp);
+ return item;
+}
+
+static int cpy_config(oconfig_item_t *ci) {
+ int i;
+ PyObject *sys;
+ PyObject *sys_path;
+ PyObject *module;
+
+ /* Ok in theory we shouldn't do initialization at this point
+ * but we have to. In order to give python scripts a chance
+ * to register a config callback we need to be able to execute
+ * python code during the config callback so we have to start
+ * the interpreter here. */
+ /* Do *not* use the python "thread" module at this point! */
+ Py_Initialize();
+
+ PyType_Ready(&ConfigType);
+ sys = PyImport_ImportModule("sys"); /* New reference. */
+ if (sys == NULL) {
+ ERROR("python module: Unable to import \"sys\" module.");
+ /* Just print the default python exception text to stderr. */
+ PyErr_Print();
+ return 1;
+ }
+ sys_path = PyObject_GetAttrString(sys, "path"); /* New reference. */
+ Py_DECREF(sys);
+ if (sys_path == NULL) {
+ ERROR("python module: Unable to read \"sys.path\".");
+ PyErr_Print();
+ return 1;
+ }
+ module = Py_InitModule("collectd", cpy_methods); /* Borrowed reference. */
+ PyModule_AddObject(module, "Config", (PyObject *) &ConfigType); /* Steals a reference. */
+ for (i = 0; i < ci->children_num; ++i) {
+ oconfig_item_t *item = ci->children + i;
+
+ if (strcasecmp(item->key, "ModulePath") == 0) {
+ char *dir = NULL;
+ PyObject *dir_object;
+
+ if (cf_util_get_string(item, &dir) != 0)
+ continue;
+ dir_object = PyString_FromString(dir); /* New reference. */
+ if (dir_object == NULL) {
+ ERROR("python plugin: Unable to convert \"%s\" to "
+ "a python object.", dir);
+ free(dir);
+ PyErr_Print();
+ continue;
+ }
+ if (PyList_Append(sys_path, dir_object) != 0) {
+ ERROR("python plugin: Unable to append \"%s\" to "
+ "python module path.", dir);
+ PyErr_Print();
+ }
+ Py_DECREF(dir_object);
+ free(dir);
+ } else if (strcasecmp(item->key, "Import") == 0) {
+ char *module_name = NULL;
+ PyObject *module;
+
+ if (cf_util_get_string(item, &module_name) != 0)
+ continue;
+ module = PyImport_ImportModule(module_name); /* New reference. */
+ if (module == NULL) {
+ ERROR("python plugin: Error importing module \"%s\".", module_name);
+ PyErr_Print();
+ }
+ free(module_name);
+ Py_XDECREF(module);
+ } else if (strcasecmp(item->key, "Module") == 0) {
+ char *name = NULL;
+ cpy_callback_t *c;
+ PyObject *ret;
+
+ if (cf_util_get_string(item, &name) != 0)
+ continue;
+ for (c = cpy_config_callbacks; c; c = c->next) {
+ if (strcasecmp(c->name, name) == 0)
+ break;
+ }
+ if (c == NULL) {
+ WARNING("python plugin: Found a configuration for the \"%s\" plugin, "
+ "but the plugin isn't loaded or didn't register "
+ "a configuration callback.", name);
+ free(name);
+ continue;
+ }
+ free(name);
+ ret = PyObject_CallFunction(c->callback, "N",
+ cpy_oconfig_to_pyconfig(item, NULL)); /* New reference. */
+ if (ret == NULL)
+ PyErr_Print();
+ else
+ Py_DECREF(ret);
+ } else {
+ WARNING("python plugin: Ignoring unknown config key \"%s\".", item->key);
+ }
+ }
+ Py_DECREF(sys_path);
+ return 0;
+}
+
+void module_register(void) {
+ plugin_register_complex_config("python", cpy_config);
+ plugin_register_init("python", cpy_init);
+// plugin_register_read("netapp", cna_read);
+ plugin_register_shutdown("netapp", cpy_shutdown);
+}
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