src/python-systemd/id128.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <Python.h>
  23
  24 #include <systemd/sd-messages.h>
  25
  26 #include "pyutil.h"
  27
  28 PyDoc_STRVAR(module__doc__,
  29              "Python interface to the libsystemd-id128 library.\n\n"
  30              "Provides SD_MESSAGE_* constants and functions to query and generate\n"
  31              "128-bit unique identifiers."
  32 );
  33
  34 PyDoc_STRVAR(randomize__doc__,
  35              "randomize() -> UUID\n\n"
  36              "Return a new random 128-bit unique identifier.\n"
  37              "Wraps sd_id128_randomize(3)."
  38 );
  39
  40 PyDoc_STRVAR(get_machine__doc__,
  41              "get_machine() -> UUID\n\n"
  42              "Return a 128-bit unique identifier for this machine.\n"
  43              "Wraps sd_id128_get_machine(3)."
  44 );
  45
  46 PyDoc_STRVAR(get_boot__doc__,
  47              "get_boot() -> UUID\n\n"
  48              "Return a 128-bit unique identifier for this boot.\n"
  49              "Wraps sd_id128_get_boot(3)."
  50 );
  51
  52 static PyObject* make_uuid(sd_id128_t id) {
  53         _cleanup_Py_DECREF_ PyObject
  54                 *uuid = NULL, *UUID = NULL, *bytes = NULL,
  55                 *args = NULL, *kwargs = NULL;
  56
  57         uuid = PyImport_ImportModule("uuid");
  58         if (!uuid)
  59                 return NULL;
  60
  61         UUID = PyObject_GetAttrString(uuid, "UUID");
  62         bytes = PyBytes_FromStringAndSize((const char*) &id.bytes, sizeof(id.bytes));
  63         args = Py_BuildValue("()");
  64         kwargs = PyDict_New();
  65         if (!UUID || !bytes || !args || !kwargs)
  66                 return NULL;
  67
  68         if (PyDict_SetItemString(kwargs, "bytes", bytes) < 0)
  69                 return NULL;
  70
  71         return PyObject_Call(UUID, args, kwargs);
  72 }
  73
  74 #define helper(name)                                                    \
  75         static PyObject *name(PyObject *self, PyObject *args) {         \
  76                 sd_id128_t id;                                          \
  77                 int r;                                                  \
  78                                                                         \
  79                 assert(args == NULL);                                   \
  80                                                                         \
  81                 r = sd_id128_##name(&id);                               \
  82                 if (r < 0) {                                            \
  83                         errno = -r;                                     \
  84                         return PyErr_SetFromErrno(PyExc_IOError);       \
  85                 }                                                       \
  86                                                                         \
  87                 return make_uuid(id);                                   \
  88         }
  89
  90 helper(randomize)
  91 helper(get_machine)
  92 helper(get_boot)
  93
  94 static PyMethodDef methods[] = {
  95         { "randomize", randomize, METH_NOARGS, randomize__doc__},
  96         { "get_machine", get_machine, METH_NOARGS, get_machine__doc__},
  97         { "get_boot", get_boot, METH_NOARGS, get_boot__doc__},
  98         { NULL, NULL, 0, NULL }        /* Sentinel */
  99 };
 100
 101 static int add_id(PyObject *module, const char* name, sd_id128_t id) {
 102         PyObject *obj;
 103
 104         obj = make_uuid(id);
 105         if (!obj)
 106                 return -1;
 107
 108         return PyModule_AddObject(module, name, obj);
 109 }
 110
 111 #pragma GCC diagnostic push
 112 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
 113
 114 #if PY_MAJOR_VERSION < 3
 115
 116 PyMODINIT_FUNC initid128(void) {
 117         PyObject *m;
 118
 119         m = Py_InitModule3("id128", methods, module__doc__);
 120         if (m == NULL)
 121                 return;
 122
 123         /* a series of lines like 'add_id() ;' follow */
 124 #define JOINER ;
 125 #include "id128-constants.h"
 126 #undef JOINER
 127         PyModule_AddStringConstant(m, "__version__", PACKAGE_VERSION);
 128 }
 129
 130 #else
 131
 132 static struct PyModuleDef module = {
 133         PyModuleDef_HEAD_INIT,
 134         "id128", /* name of module */
 135         module__doc__, /* module documentation, may be NULL */
 136         -1, /* size of per-interpreter state of the module */
 137         methods
 138 };
 139
 140 PyMODINIT_FUNC PyInit_id128(void) {
 141         PyObject *m;
 142
 143         m = PyModule_Create(&module);
 144         if (m == NULL)
 145                 return NULL;
 146
 147         if ( /* a series of lines like 'add_id() ||' follow */
 148 #define JOINER ||
 149 #include "id128-constants.h"
 150 #undef JOINER
 151             PyModule_AddStringConstant(m, "__version__", PACKAGE_VERSION)) {
 152                 Py_DECREF(m);
 153                 return NULL;
 154         }
 155
 156         return m;
 157 }
 158
 159 #endif
 160
 161 #pragma GCC diagnostic pop