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mirror of https://github.com/samba-team/samba.git synced 2024-12-23 17:34:34 +03:00
samba-mirror/lib/tevent/pytevent.c
Andreas Schneider 9621a3d7a6 Use python.h from libreplace
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15513

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-20 15:37:33 +00:00

799 lines
20 KiB
C

/*
Unix SMB/CIFS implementation.
Python bindings for tevent
Copyright (C) Jelmer Vernooij 2010
** NOTE! The following LGPL license applies to the tevent
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "lib/replace/system/python.h"
#include "replace.h"
#include <tevent.h>
/* discard signature of 'func' in favour of 'target_sig' */
#define PY_DISCARD_FUNC_SIG(target_sig, func) (target_sig)(void(*)(void))func
void init_tevent(void);
typedef struct {
PyObject_HEAD
struct tevent_context *ev;
} TeventContext_Object;
typedef struct {
PyObject_HEAD
struct tevent_queue *queue;
} TeventQueue_Object;
typedef struct {
PyObject_HEAD
struct tevent_req *req;
} TeventReq_Object;
typedef struct {
PyObject_HEAD
struct tevent_signal *signal;
} TeventSignal_Object;
typedef struct {
PyObject_HEAD
struct tevent_timer *timer;
PyObject *callback;
} TeventTimer_Object;
typedef struct {
PyObject_HEAD
struct tevent_fd *fd;
} TeventFd_Object;
static PyTypeObject TeventContext_Type;
static PyTypeObject TeventReq_Type;
static PyTypeObject TeventQueue_Type;
static PyTypeObject TeventSignal_Type;
static PyTypeObject TeventTimer_Type;
static PyTypeObject TeventFd_Type;
static PyObject *py_tevent_context_reinitialise(TeventContext_Object *self,
PyObject *Py_UNUSED(ignored))
{
int ret = tevent_re_initialise(self->ev);
if (ret != 0) {
PyErr_SetNone(PyExc_RuntimeError);
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *py_tevent_queue_stop(TeventQueue_Object *self,
PyObject *Py_UNUSED(ignored))
{
tevent_queue_stop(self->queue);
Py_RETURN_NONE;
}
static PyObject *py_tevent_queue_start(TeventQueue_Object *self,
PyObject *Py_UNUSED(ignored))
{
tevent_queue_start(self->queue);
Py_RETURN_NONE;
}
static void py_queue_trigger(struct tevent_req *req, void *private_data)
{
PyObject *callback = private_data, *ret;
ret = PyObject_CallFunction(callback, discard_const_p(char, ""));
Py_XDECREF(ret);
}
static PyObject *py_tevent_queue_add(TeventQueue_Object *self, PyObject *args)
{
TeventContext_Object *py_ev;
TeventReq_Object *py_req;
PyObject *trigger;
bool ret;
if (!PyArg_ParseTuple(args, "O!O!O",
&TeventContext_Type, &py_ev,
&TeventReq_Type, &py_req,
&trigger))
return NULL;
Py_INCREF(trigger);
ret = tevent_queue_add(self->queue, py_ev->ev, py_req->req,
py_queue_trigger, trigger);
if (!ret) {
PyErr_SetString(PyExc_RuntimeError, "queue add failed");
Py_DECREF(trigger);
return NULL;
}
Py_RETURN_NONE;
}
static PyMethodDef py_tevent_queue_methods[] = {
{ "stop", (PyCFunction)py_tevent_queue_stop,
METH_NOARGS,
"S.stop()" },
{ "start", (PyCFunction)py_tevent_queue_start,
METH_NOARGS,
"S.start()" },
{ "add", (PyCFunction)py_tevent_queue_add, METH_VARARGS,
"S.add(ctx, req, trigger, baton)" },
{0},
};
static PyObject *py_tevent_context_wakeup_send(PyObject *self, PyObject *args)
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_context_loop_wait(TeventContext_Object *self,
PyObject *Py_UNUSED(ignored))
{
if (tevent_loop_wait(self->ev) != 0) {
PyErr_SetNone(PyExc_RuntimeError);
return NULL;
}
Py_RETURN_NONE;
}
static PyObject *py_tevent_context_loop_once(TeventContext_Object *self,
PyObject *Py_UNUSED(ignored))
{
if (tevent_loop_once(self->ev) != 0) {
PyErr_SetNone(PyExc_RuntimeError);
return NULL;
}
Py_RETURN_NONE;
}
static void py_tevent_signal_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *private_data)
{
PyObject *callback = (PyObject *)private_data, *ret;
ret = PyObject_CallFunction(callback, discard_const_p(char, "ii"), signum, count);
Py_XDECREF(ret);
}
static void py_tevent_signal_dealloc(TeventSignal_Object *self)
{
talloc_free(self->signal);
PyObject_Del(self);
}
static PyTypeObject TeventSignal_Type = {
.tp_name = "tevent.Signal",
.tp_basicsize = sizeof(TeventSignal_Object),
.tp_dealloc = (destructor)py_tevent_signal_dealloc,
.tp_flags = Py_TPFLAGS_DEFAULT,
};
static PyObject *py_tevent_context_add_signal(TeventContext_Object *self, PyObject *args)
{
int signum, sa_flags;
PyObject *handler;
struct tevent_signal *sig;
TeventSignal_Object *ret;
if (!PyArg_ParseTuple(args, "iiO", &signum, &sa_flags, &handler))
return NULL;
Py_INCREF(handler);
sig = tevent_add_signal(self->ev, NULL, signum, sa_flags,
py_tevent_signal_handler, handler);
ret = PyObject_New(TeventSignal_Object, &TeventSignal_Type);
if (ret == NULL) {
PyErr_NoMemory();
talloc_free(sig);
return NULL;
}
ret->signal = sig;
return (PyObject *)ret;
}
static void py_timer_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval current_time,
void *private_data)
{
TeventTimer_Object *self = private_data;
PyObject *ret;
ret = PyObject_CallFunction(self->callback, discard_const_p(char, "l"), te);
if (ret == NULL) {
/* No Python stack to propagate exception to; just print traceback */
PyErr_PrintEx(0);
}
Py_XDECREF(ret);
}
static void py_tevent_timer_dealloc(TeventTimer_Object *self)
{
if (self->timer) {
talloc_free(self->timer);
}
Py_CLEAR(self->callback);
PyObject_Del(self);
}
static int py_tevent_timer_traverse(TeventTimer_Object *self, visitproc visit, void *arg)
{
Py_VISIT(self->callback);
return 0;
}
static PyObject* py_tevent_timer_get_active(TeventTimer_Object *self,
PyObject *Py_UNUSED(ignored))
{
return PyBool_FromLong(self->timer != NULL);
}
struct PyGetSetDef py_tevent_timer_getset[] = {
{
.name = discard_const_p(char, "active"),
.get = (getter)py_tevent_timer_get_active,
.doc = discard_const_p(char, "true if the timer is scheduled to run"),
},
{0},
};
static PyTypeObject TeventTimer_Type = {
.tp_name = "tevent.Timer",
.tp_basicsize = sizeof(TeventTimer_Object),
.tp_dealloc = (destructor)py_tevent_timer_dealloc,
.tp_traverse = (traverseproc)py_tevent_timer_traverse,
.tp_getset = py_tevent_timer_getset,
.tp_flags = Py_TPFLAGS_DEFAULT,
};
struct TeventTimer_Object_ref {
TeventTimer_Object *obj;
};
static int TeventTimer_Object_ref_destructor(struct TeventTimer_Object_ref *ref)
{
ref->obj->timer = NULL;
Py_CLEAR(ref->obj);
return 0;
}
static PyObject *py_tevent_context_add_timer_internal(TeventContext_Object *self,
struct timeval next_event,
PyObject *callback)
{
/* Ownership notes:
*
* There are 5 pieces in play; two tevent contexts and 3 Python objects:
* - The tevent timer
* - The tevent context
* - The Python context -- "self"
* - The Python timer (TeventTimer_Object) -- "ret"
* - The Python callback function -- "callback"
*
* We only use the Python context for getting the tevent context,
* afterwards it can be destroyed.
*
* The tevent context owns the tevent timer.
*
* The tevent timer holds a reference to the Python timer, so the Python
* timer must always outlive the tevent timer.
* The Python timer has a pointer to the tevent timer; a destructor is
* used to set this to NULL when the tevent timer is deallocated.
*
* The tevent timer can be deallocated in these cases:
* 1) when the context is destroyed
* 2) after the event fires
* Posssibly, API might be added to cancel (free the tevent timer).
*
* The Python timer holds a reference to the callback.
*/
TeventTimer_Object *ret;
struct TeventTimer_Object_ref *ref;
ret = PyObject_New(TeventTimer_Object, &TeventTimer_Type);
if (ret == NULL) {
PyErr_NoMemory();
return NULL;
}
Py_INCREF(callback);
ret->callback = callback;
ret->timer = tevent_add_timer(self->ev, NULL, next_event, py_timer_handler,
ret);
if (ret->timer == NULL) {
Py_DECREF(ret);
PyErr_SetString(PyExc_RuntimeError, "Could not initialize timer");
return NULL;
}
ref = talloc(ret->timer, struct TeventTimer_Object_ref);
if (ref == NULL) {
talloc_free(ret->timer);
Py_DECREF(ret);
PyErr_SetString(PyExc_RuntimeError, "Could not initialize timer");
return NULL;
}
Py_INCREF(ret);
ref->obj = ret;
talloc_set_destructor(ref, TeventTimer_Object_ref_destructor);
return (PyObject *)ret;
}
static PyObject *py_tevent_context_add_timer(TeventContext_Object *self, PyObject *args)
{
struct timeval next_event;
PyObject *callback;
double secs, usecs;
if (!PyArg_ParseTuple(args, "dO", &secs, &callback)){
return NULL;
}
next_event.tv_sec = secs;
usecs = (secs - next_event.tv_sec) * 1000000.0;
next_event.tv_usec = usecs;
return py_tevent_context_add_timer_internal(self, next_event, callback);
}
static PyObject *py_tevent_context_add_timer_offset(TeventContext_Object *self, PyObject *args)
{
struct timeval next_event;
double offset;
int seconds;
PyObject *callback;
if (!PyArg_ParseTuple(args, "dO", &offset, &callback))
return NULL;
seconds = offset;
offset -= seconds;
next_event = tevent_timeval_current_ofs(seconds, (int)(offset*1000000));
return py_tevent_context_add_timer_internal(self, next_event, callback);
}
static void py_fd_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags,
void *private_data)
{
PyObject *callback = private_data, *ret;
ret = PyObject_CallFunction(callback, discard_const_p(char, "i"), flags);
Py_XDECREF(ret);
}
static void py_tevent_fp_dealloc(TeventFd_Object *self)
{
talloc_free(self->fd);
PyObject_Del(self);
}
static PyTypeObject TeventFd_Type = {
.tp_name = "tevent.Fd",
.tp_basicsize = sizeof(TeventFd_Object),
.tp_dealloc = (destructor)py_tevent_fp_dealloc,
.tp_flags = Py_TPFLAGS_DEFAULT,
};
static PyObject *py_tevent_context_add_fd(TeventContext_Object *self, PyObject *args)
{
int fd, flags;
PyObject *handler;
struct tevent_fd *tfd;
TeventFd_Object *ret;
if (!PyArg_ParseTuple(args, "iiO", &fd, &flags, &handler))
return NULL;
tfd = tevent_add_fd(self->ev, NULL, fd, flags, py_fd_handler, handler);
if (tfd == NULL) {
PyErr_SetNone(PyExc_RuntimeError);
return NULL;
}
ret = PyObject_New(TeventFd_Object, &TeventFd_Type);
if (ret == NULL) {
talloc_free(tfd);
return NULL;
}
ret->fd = tfd;
return (PyObject *)ret;
}
static PyMethodDef py_tevent_context_methods[] = {
{ "reinitialise", (PyCFunction)py_tevent_context_reinitialise,
METH_NOARGS,
"S.reinitialise()" },
{ "wakeup_send", (PyCFunction)py_tevent_context_wakeup_send,
METH_VARARGS, "S.wakeup_send(wakeup_time) -> req" },
{ "loop_wait", (PyCFunction)py_tevent_context_loop_wait,
METH_NOARGS, "S.loop_wait()" },
{ "loop_once", (PyCFunction)py_tevent_context_loop_once,
METH_NOARGS, "S.loop_once()" },
{ "add_signal", (PyCFunction)py_tevent_context_add_signal,
METH_VARARGS, "S.add_signal(signum, sa_flags, handler) -> signal" },
{ "add_timer", (PyCFunction)py_tevent_context_add_timer,
METH_VARARGS, "S.add_timer(next_event, handler) -> timer" },
{ "add_timer_offset", (PyCFunction)py_tevent_context_add_timer_offset,
METH_VARARGS, "S.add_timer_offset(offset_seconds, handler) -> timer" },
{ "add_fd", (PyCFunction)py_tevent_context_add_fd,
METH_VARARGS, "S.add_fd(fd, flags, handler) -> fd" },
{0},
};
static PyObject *py_tevent_req_wakeup_recv(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_received(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_is_error(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_poll(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_is_in_progress(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyGetSetDef py_tevent_req_getsetters[] = {
{
.name = discard_const_p(char, "in_progress"),
.get = (getter)py_tevent_req_is_in_progress,
.doc = discard_const_p(char, "Whether the request is in progress"),
},
{0}
};
static PyObject *py_tevent_req_post(PyObject *self, PyObject *args)
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_set_error(PyObject *self, PyObject *args)
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_done(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_notify_callback(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_set_endtime(PyObject *self, PyObject *args)
{
/* FIXME */
Py_RETURN_NONE;
}
static PyObject *py_tevent_req_cancel(TeventReq_Object *self,
PyObject *Py_UNUSED(ignored))
{
if (!tevent_req_cancel(self->req)) {
PyErr_SetNone(PyExc_RuntimeError);
return NULL;
}
Py_RETURN_NONE;
}
static PyMethodDef py_tevent_req_methods[] = {
{ "wakeup_recv", (PyCFunction)py_tevent_req_wakeup_recv,
METH_NOARGS,
"Wakeup received" },
{ "received", (PyCFunction)py_tevent_req_received,
METH_NOARGS,
"Receive finished" },
{ "is_error", (PyCFunction)py_tevent_req_is_error, METH_NOARGS,
"is_error() -> (error, state)" },
{ "poll", (PyCFunction)py_tevent_req_poll, METH_VARARGS,
"poll(ctx)" },
{ "post", (PyCFunction)py_tevent_req_post, METH_VARARGS,
"post(ctx) -> req" },
{ "set_error", (PyCFunction)py_tevent_req_set_error, METH_VARARGS,
"set_error(error)" },
{ "done", (PyCFunction)py_tevent_req_done, METH_NOARGS,
"done()" },
{ "notify_callback", (PyCFunction)py_tevent_req_notify_callback,
METH_NOARGS, "notify_callback()" },
{ "set_endtime", (PyCFunction)py_tevent_req_set_endtime,
METH_VARARGS, "set_endtime(ctx, endtime)" },
{ "cancel", (PyCFunction)py_tevent_req_cancel,
METH_NOARGS, "cancel()" },
{0}
};
static void py_tevent_req_dealloc(TeventReq_Object *self)
{
talloc_free(self->req);
PyObject_DEL(self);
}
static PyTypeObject TeventReq_Type = {
.tp_name = "tevent.Request",
.tp_basicsize = sizeof(TeventReq_Object),
.tp_methods = py_tevent_req_methods,
.tp_dealloc = (destructor)py_tevent_req_dealloc,
.tp_getset = py_tevent_req_getsetters,
/* FIXME: .tp_new = py_tevent_req_new, */
};
static PyObject *py_tevent_queue_get_length(TeventQueue_Object *self,
PyObject *Py_UNUSED(ignored))
{
return PyLong_FromLong(tevent_queue_length(self->queue));
}
static PyGetSetDef py_tevent_queue_getsetters[] = {
{
.name = discard_const_p(char, "length"),
.get = (getter)py_tevent_queue_get_length,
.doc = discard_const_p(char, "The number of elements in the queue."),
},
{0},
};
static void py_tevent_queue_dealloc(TeventQueue_Object *self)
{
talloc_free(self->queue);
PyObject_Del(self);
}
static PyTypeObject TeventQueue_Type = {
.tp_name = "tevent.Queue",
.tp_basicsize = sizeof(TeventQueue_Object),
.tp_dealloc = (destructor)py_tevent_queue_dealloc,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_getset = py_tevent_queue_getsetters,
.tp_methods = py_tevent_queue_methods,
};
static PyObject *py_tevent_context_signal_support(PyObject *_self,
PyObject *Py_UNUSED(ignored))
{
TeventContext_Object *self = (TeventContext_Object *)_self;
return PyBool_FromLong(tevent_signal_support(self->ev));
}
static PyGetSetDef py_tevent_context_getsetters[] = {
{
.name = discard_const_p(char, "signal_support"),
.get = PY_DISCARD_FUNC_SIG(getter,
py_tevent_context_signal_support),
.doc = discard_const_p(char, "if this platform and tevent context support signal handling"),
},
{0}
};
static void py_tevent_context_dealloc(TeventContext_Object *self)
{
talloc_free(self->ev);
PyObject_Del(self);
}
static PyObject *py_tevent_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
const char * const kwnames[] = { "name", NULL };
char *name = NULL;
struct tevent_context *ev;
TeventContext_Object *ret;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|s", discard_const_p(char *, kwnames), &name))
return NULL;
if (name == NULL) {
ev = tevent_context_init(NULL);
} else {
ev = tevent_context_init_byname(NULL, name);
}
if (ev == NULL) {
PyErr_SetNone(PyExc_RuntimeError);
return NULL;
}
ret = PyObject_New(TeventContext_Object, type);
if (ret == NULL) {
PyErr_NoMemory();
talloc_free(ev);
return NULL;
}
ret->ev = ev;
return (PyObject *)ret;
}
static PyTypeObject TeventContext_Type = {
.tp_name = "tevent.Context",
.tp_new = py_tevent_context_new,
.tp_basicsize = sizeof(TeventContext_Object),
.tp_dealloc = (destructor)py_tevent_context_dealloc,
.tp_methods = py_tevent_context_methods,
.tp_getset = py_tevent_context_getsetters,
.tp_flags = Py_TPFLAGS_DEFAULT,
};
static PyObject *py_set_default_backend(PyObject *self, PyObject *args)
{
char *backend_name;
if (!PyArg_ParseTuple(args, "s", &backend_name))
return NULL;
tevent_set_default_backend(backend_name);
Py_RETURN_NONE;
}
static PyObject *py_backend_list(PyObject *self,
PyObject *Py_UNUSED(ignored))
{
PyObject *ret = NULL;
PyObject *string = NULL;
int i, result;
const char **backends = NULL;
ret = PyList_New(0);
if (ret == NULL) {
return NULL;
}
backends = tevent_backend_list(NULL);
if (backends == NULL) {
PyErr_SetNone(PyExc_RuntimeError);
goto err;
}
for (i = 0; backends[i]; i++) {
string = PyUnicode_FromString(backends[i]);
if (!string) {
goto err;
}
result = PyList_Append(ret, string);
if (result) {
goto err;
}
Py_DECREF(string);
string = NULL;
}
talloc_free(backends);
return ret;
err:
Py_XDECREF(ret);
Py_XDECREF(string);
talloc_free(backends);
return NULL;
}
static PyMethodDef tevent_methods[] = {
{ "set_default_backend", (PyCFunction)py_set_default_backend,
METH_VARARGS, "set_default_backend(backend)" },
{ "backend_list", (PyCFunction)py_backend_list,
METH_NOARGS, "backend_list() -> list" },
{0},
};
#define MODULE_DOC PyDoc_STR("Python wrapping of talloc-maintained objects.")
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
.m_name = "_tevent",
.m_doc = MODULE_DOC,
.m_size = -1,
.m_methods = tevent_methods,
};
PyObject * module_init(void);
PyObject * module_init(void)
{
PyObject *m;
if (PyType_Ready(&TeventContext_Type) < 0)
return NULL;
if (PyType_Ready(&TeventQueue_Type) < 0)
return NULL;
if (PyType_Ready(&TeventReq_Type) < 0)
return NULL;
if (PyType_Ready(&TeventSignal_Type) < 0)
return NULL;
if (PyType_Ready(&TeventTimer_Type) < 0)
return NULL;
if (PyType_Ready(&TeventFd_Type) < 0)
return NULL;
m = PyModule_Create(&moduledef);
if (m == NULL)
return NULL;
Py_INCREF(&TeventContext_Type);
PyModule_AddObject(m, "Context", (PyObject *)&TeventContext_Type);
Py_INCREF(&TeventQueue_Type);
PyModule_AddObject(m, "Queue", (PyObject *)&TeventQueue_Type);
Py_INCREF(&TeventReq_Type);
PyModule_AddObject(m, "Request", (PyObject *)&TeventReq_Type);
Py_INCREF(&TeventSignal_Type);
PyModule_AddObject(m, "Signal", (PyObject *)&TeventSignal_Type);
Py_INCREF(&TeventTimer_Type);
PyModule_AddObject(m, "Timer", (PyObject *)&TeventTimer_Type);
Py_INCREF(&TeventFd_Type);
PyModule_AddObject(m, "Fd", (PyObject *)&TeventFd_Type);
PyModule_AddStringConstant(m, "__version__", PACKAGE_VERSION);
return m;
}
PyMODINIT_FUNC PyInit__tevent(void);
PyMODINIT_FUNC PyInit__tevent(void)
{
return module_init();
}