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#include "Python.h"
#include <dirent.h>
// TODO: put it in a place where python can use it when writing metadata
#define MAX_PROPERTY_LENGTH 500 * 1024
static PyObject *byte_array_type = NULL;
static PyObject *
metadatareader_retrieve(PyObject *unused, PyObject *args)
{
PyObject *dict = NULL;
PyObject *properties = NULL;
const char *dir_path = NULL;
char *metadata_path = NULL;
DIR *dir_stream = NULL;
struct dirent *dir_entry = NULL;
char *file_path = NULL;
FILE *file = NULL;
char *value_buf = NULL;
if (!PyArg_ParseTuple(args, "sO:retrieve", &dir_path, &properties))
return NULL;
// Build path to the metadata directory
int metadata_path_size = strlen(dir_path) + 10;
metadata_path = PyMem_Malloc(metadata_path_size);
if (metadata_path == NULL) {
PyErr_NoMemory();
goto cleanup;
}
snprintf (metadata_path, metadata_path_size, "%s/%s", dir_path, "metadata");
dir_stream = opendir (metadata_path);
if (dir_stream == NULL) {
char buf[256];
snprintf(buf, sizeof(buf), "Couldn't open metadata directory %s",
metadata_path);
PyErr_SetString(PyExc_IOError, buf);
goto cleanup;
}
dict = PyDict_New();
dir_entry = readdir(dir_stream);
while (dir_entry != NULL) {
long file_size;
int file_path_size;
PyObject *value = NULL;
// Skip . and ..
if (dir_entry->d_name[0] == '.' &&
(strlen(dir_entry->d_name) == 1 ||
(dir_entry->d_name[1] == '.' &&
strlen(dir_entry->d_name) == 2)))
goto next_property;
// Check if the property is in the properties list
if ((properties != Py_None) && (PyList_Size(properties) > 0)) {
int found = 0;
int i;
for (i = 0; i < PyList_Size(properties); i++) {
PyObject *property = PyList_GetItem(properties, i);
if (!strcmp (dir_entry->d_name, PyString_AsString (property))) {
found = 1;
}
}
if (!found) {
goto next_property;
}
}
// Build path of the property file
file_path_size = strlen(metadata_path) + 1 + strlen(dir_entry->d_name) +
1;
file_path = PyMem_Malloc(file_path_size);
if (file_path == NULL) {
PyErr_NoMemory();
goto cleanup;
}
snprintf (file_path, file_path_size, "%s/%s", metadata_path,
dir_entry->d_name);
file = fopen(file_path, "r");
if (file == NULL) {
char buf[256];
snprintf(buf, sizeof(buf), "Cannot open property file %s: %s",
file_path, strerror(errno));
PyErr_SetString(PyExc_IOError, buf);
goto cleanup;
}
// Get file size
fseek (file, 0, SEEK_END);
file_size = ftell (file);
rewind (file);
if (file_size == 0) {
// Empty property
value = PyString_FromString("");
if (value == NULL) {
PyErr_SetString(PyExc_ValueError,
"Failed to convert value to python string");
goto cleanup;
}
} else {
if (file_size > MAX_PROPERTY_LENGTH) {
PyErr_SetString(PyExc_ValueError, "Property file too big");
goto cleanup;
}
// Read the whole file
value_buf = PyMem_Malloc(file_size);
if (value_buf == NULL) {
PyErr_NoMemory();
goto cleanup;
}
long read_size = fread(value_buf, 1, file_size, file);
if (read_size < file_size) {
char buf[256];
snprintf(buf, sizeof(buf),
"Error while reading property file %s", file_path);
PyErr_SetString(PyExc_IOError, buf);
goto cleanup;
}
// Convert value to dbus.ByteArray
PyObject *args = Py_BuildValue("(s#)", value_buf, file_size);
value = PyObject_CallObject(byte_array_type, args);
if (value == NULL) {
PyErr_SetString(PyExc_ValueError,
"Failed to convert value to dbus.ByteArray");
goto cleanup;
}
}
// Add property to the metadata dict
if (PyDict_SetItemString(dict, dir_entry->d_name, value) == -1) {
PyErr_SetString(PyExc_ValueError,
"Failed to add property to dictionary");
goto cleanup;
}
next_property:
if (file_path) {
PyMem_Free(file_path);
file_path = NULL;
}
if (file) {
fclose(file);
file = NULL;
}
if (value_buf) {
PyMem_Free(value_buf);
value_buf = NULL;
}
dir_entry = readdir(dir_stream);
}
closedir(dir_stream);
return dict;
cleanup:
if (file_path) {
PyMem_Free(file_path);
}
if (value_buf) {
PyMem_Free(value_buf);
}
if (dict) {
Py_DECREF(dict);
}
if (file) {
fclose(file);
}
if (dir_stream) {
closedir(dir_stream);
}
return NULL;
}
static PyMethodDef metadatareader_functions[] = {
{"retrieve", metadatareader_retrieve, METH_VARARGS, PyDoc_STR("Read a dictionary from a file")},
{NULL, NULL, 0, NULL}
};
PyMODINIT_FUNC
initmetadatareader(void)
{
PyObject* mod;
mod = Py_InitModule("metadatareader", metadatareader_functions);
PyObject *dbus_module = PyImport_ImportModule("dbus");
byte_array_type = PyObject_GetAttrString(dbus_module, "ByteArray");
}
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