python: add systemd.id128 module

[elogind.git] / src / python-systemd / id128.c

diff --git a/src/python-systemd/id128.c b/src/python-systemd/id128.c
new file mode 100644 (file)
index 0000000..f82b0af
--- /dev/null
+++ b/src/python-systemd/id128.c
@@ -0,0 +1,157 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
+
+  systemd 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 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <Python.h>
+
+#include <systemd/sd-messages.h>
+
+#define _cleanup_Py_DECREF_ __attribute__((cleanup(cleanup_Py_DECREFp)))
+
+static void cleanup_Py_DECREFp(PyObject **p) {
+        if (!*p)
+                return;
+
+        Py_DECREF(*p);
+}
+
+PyDoc_STRVAR(module__doc__,
+             "Python interface to the libsystemd-id128 library.\n\n"
+             "Provides SD_MESSAGE_* constants and functions to query and generate\n"
+             "128bit unique identifiers."
+);
+
+PyDoc_STRVAR(randomize__doc__,
+             "randomize() -> UUID\n\n"
+             "Return a new random 128bit unique identifier.\n"
+             "Wraps sd_id128_randomize(3)."
+);
+
+PyDoc_STRVAR(get_machine__doc__,
+             "get_machine() -> UUID\n\n"
+             "Return a 128bit unique identifier for this machine.\n"
+             "Wraps sd_id128_get_machine(3)."
+);
+
+PyDoc_STRVAR(get_boot__doc__,
+             "get_boot() -> UUID\n\n"
+             "Return a 128bit unique identifier for this boot.\n"
+             "Wraps sd_id128_get_boot(3)."
+);
+
+static PyObject* make_uuid(sd_id128_t id) {
+        PyObject _cleanup_Py_DECREF_
+                *uuid = NULL, *UUID = NULL, *bytes = NULL,
+                *args = NULL, *kwargs = NULL, *obj = NULL;
+
+        uuid = PyImport_ImportModule("uuid");
+        if (!uuid)
+                return NULL;
+
+        UUID = PyObject_GetAttrString(uuid, "UUID");
+        bytes = PyBytes_FromStringAndSize((const char*) &id.bytes, sizeof(id.bytes));
+        args = Py_BuildValue("()");
+        kwargs = PyDict_New();
+        if (!UUID || !bytes || !args || !kwargs)
+                return NULL;
+
+        if (PyDict_SetItemString(kwargs, "bytes", bytes) < 0)
+                return NULL;
+
+        return PyObject_Call(UUID, args, kwargs);
+}
+
+#define helper(name)                                                    \
+        static PyObject *name(PyObject *self, PyObject *args) {         \
+                sd_id128_t id;                                          \
+                int r;                                                  \
+                                                                        \
+                assert(args == NULL);                                   \
+                                                                        \
+                r = sd_id128_##name(&id);                               \
+                if (r < 0) {                                            \
+                        errno = -r;                                     \
+                        return PyErr_SetFromErrno(PyExc_IOError);       \
+                }                                                       \
+                                                                        \
+                return make_uuid(id);                                   \
+        }
+
+helper(randomize)
+helper(get_machine)
+helper(get_boot)
+
+static PyMethodDef methods[] = {
+        { "randomize", randomize, METH_NOARGS, randomize__doc__},
+        { "get_machine", get_machine, METH_NOARGS, get_machine__doc__},
+        { "get_boot", get_boot, METH_NOARGS, get_boot__doc__},
+        { NULL, NULL, 0, NULL }        /* Sentinel */
+};
+
+static int add_id(PyObject *module, const char* name, sd_id128_t id) {
+        PyObject _cleanup_Py_DECREF_ *obj;
+
+        obj = make_uuid(id);
+        if (!obj)
+                return -1;
+
+        return PyObject_SetAttrString(module, name, obj);
+}
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-prototypes"
+
+#if PY_MAJOR_VERSION < 3
+
+PyMODINIT_FUNC initid128(void) {
+        PyObject *m;
+
+        m = Py_InitModule3("id128", methods, module__doc__);
+        if (m == NULL)
+                return;
+
+#include "id128-constants.h"
+}
+
+#else
+
+static struct PyModuleDef module = {
+        PyModuleDef_HEAD_INIT,
+        "id128", /* name of module */
+        module__doc__, /* module documentation, may be NULL */
+        0, /* size of per-interpreter state of the module */
+        methods
+};
+
+PyMODINIT_FUNC PyInit_id128(void) {
+        PyObject *m;
+
+        m = PyModule_Create(&module);
+        if (m == NULL)
+                return NULL;
+
+#include "id128-constants.h"
+
+        return m;
+}
+
+#endif
+
+#pragma GCC diagnostic pop