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//-----------------------------------------------------------------------------
// Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// cxoJsonBuffer.c
// Defines buffer structure and routines for populating JSON values. These
// are used to translate Python objects (scalars, dictionaries and lists) into
// JSON values stored in the database.
//-----------------------------------------------------------------------------
#include "cxoModule.h"
#define CXO_JSON_ENCODING "UTF-8"
//-----------------------------------------------------------------------------
// cxoJsonBuffer_getBuffer()
// Acquire a new buffer from the array of buffers. If one is not available,
// more space is allocated in chunks.
//-----------------------------------------------------------------------------
static int cxoJsonBuffer_getBuffer(cxoJsonBuffer *buf, cxoBuffer **buffer)
{
cxoBuffer *tempBuffers;
if (buf->numBuffers == buf->allocatedBuffers) {
buf->allocatedBuffers += 16;
tempBuffers = PyMem_Realloc(buf->buffers,
buf->allocatedBuffers * sizeof(cxoBuffer));
if (!tempBuffers) {
PyErr_NoMemory();
return -1;
}
buf->buffers = tempBuffers;
}
*buffer = &buf->buffers[buf->numBuffers++];
return 0;
}
//-----------------------------------------------------------------------------
// cxoJsonBuffer_populateNode()
// Populate a particular node with the value of the Python object.
//-----------------------------------------------------------------------------
static int cxoJsonBuffer_populateNode(cxoJsonBuffer *buf, dpiJsonNode *node,
PyObject *value)
{
cxoTransformNum transformNum;
PyObject *childValue, *key;
cxoBuffer *tempBuffer;
Py_ssize_t pos, size;
dpiJsonArray *array;
dpiJsonObject *obj;
char message[250];
uint32_t i;
// handle NULL values
if (value == Py_None) {
node->oracleTypeNum = DPI_ORACLE_TYPE_NONE;
node->nativeTypeNum = DPI_NATIVE_TYPE_NULL;
return 0;
}
// handle arrays
if (PyList_Check(value)) {
// initialize array
node->oracleTypeNum = DPI_ORACLE_TYPE_JSON_ARRAY;
node->nativeTypeNum = DPI_NATIVE_TYPE_JSON_ARRAY;
array = &node->value->asJsonArray;
array->numElements = (uint32_t) PyList_GET_SIZE(value);
array->elements = PyMem_Calloc(array->numElements,
sizeof(dpiJsonNode));
array->elementValues = PyMem_Calloc(array->numElements,
sizeof(dpiDataBuffer));
if (!array->elements || !array->elementValues) {
PyErr_NoMemory();
return -1;
}
// process each element of the array
for (i = 0; i < array->numElements; i++) {
childValue = PyList_GET_ITEM(value, i);
array->elements[i].value = &array->elementValues[i];
if (cxoJsonBuffer_populateNode(buf, &array->elements[i],
childValue) < 0)
return -1;
}
return 0;
}
// handle dictionaries
if (PyDict_Check(value)) {
// initialize object
node->oracleTypeNum = DPI_ORACLE_TYPE_JSON_OBJECT;
node->nativeTypeNum = DPI_NATIVE_TYPE_JSON_OBJECT;
obj = &node->value->asJsonObject;
size = PyDict_Size(value);
if (size < 0)
return -1;
obj->numFields = (uint32_t) size;
obj->fieldNames = PyMem_Calloc(obj->numFields, sizeof(char*));
obj->fieldNameLengths = PyMem_Calloc(obj->numFields, sizeof(uint32_t));
obj->fields = PyMem_Calloc(obj->numFields, sizeof(dpiJsonNode));
obj->fieldValues = PyMem_Calloc(obj->numFields,
sizeof(dpiDataBuffer));
if (!obj->fieldNames || !obj->fieldNameLengths || !obj->fields ||
!obj->fieldValues) {
PyErr_NoMemory();
return -1;
}
// process each entry in the dictionary
i = 0;
pos = 0;
while (PyDict_Next(value, &pos, &key, &childValue)) {
if (cxoJsonBuffer_getBuffer(buf, &tempBuffer) < 0)
return -1;
if (cxoBuffer_fromObject(tempBuffer, key, CXO_JSON_ENCODING) < 0)
return -1;
obj->fields[i].value = &obj->fieldValues[i];
obj->fieldNames[i] = (char*) tempBuffer->ptr;
obj->fieldNameLengths[i] = tempBuffer->size;
if (cxoJsonBuffer_populateNode(buf, &obj->fields[i],
childValue) < 0)
return -1;
i++;
}
return 0;
}
// handle scalar values
tempBuffer = NULL;
transformNum = cxoTransform_getNumFromPythonValue(value, 1);
switch (transformNum) {
// strings and bytes must have a buffer made available for them to
// store a reference to the object and the actual pointer and length;
// numbers are converted to a string in order to prevent precision loss
case CXO_TRANSFORM_STRING:
case CXO_TRANSFORM_BINARY:
case CXO_TRANSFORM_INT:
case CXO_TRANSFORM_FLOAT:
case CXO_TRANSFORM_DECIMAL:
if (cxoJsonBuffer_getBuffer(buf, &tempBuffer) < 0)
return -1;
break;
// swap CXO_TRANSFORM_DATETIME to CXO_TRANSFORM_TIMESTAMP to preserve
// fractional seconds
case CXO_TRANSFORM_DATETIME:
transformNum = CXO_TRANSFORM_TIMESTAMP;
break;
// all other types do not need any special processing
case CXO_TRANSFORM_BOOLEAN:
case CXO_TRANSFORM_DATE:
case CXO_TRANSFORM_TIMEDELTA:
break;
// any other type is not currently supported
default:
snprintf(message, sizeof(message), "Python type %s not supported.",
Py_TYPE(value)->tp_name);
cxoError_raiseFromString(cxoNotSupportedErrorException, message);
return -1;
}
// transform the Python value into the Oracle value
cxoTransform_getTypeInfo(transformNum, &node->oracleTypeNum,
&node->nativeTypeNum);
if (cxoTransform_fromPython(transformNum, &node->nativeTypeNum, value,
node->value, tempBuffer, CXO_JSON_ENCODING, CXO_JSON_ENCODING,
NULL, 0) < 0)
return -1;
return 0;
}
//-----------------------------------------------------------------------------
// cxoJsonBuffer_freeNode()
// Frees any arrays allocated earlier for the specified node.
//-----------------------------------------------------------------------------
static void cxoJsonBuffer_freeNode(dpiJsonNode *node)
{
dpiJsonArray *array;
dpiJsonObject *obj;
uint32_t i;
switch (node->nativeTypeNum) {
case DPI_NATIVE_TYPE_JSON_ARRAY:
array = &node->value->asJsonArray;
if (array->elements) {
for (i = 0; i < array->numElements; i++) {
if (array->elements[i].value)
cxoJsonBuffer_freeNode(&array->elements[i]);
}
PyMem_Free(array->elements);
array->elements = NULL;
}
if (array->elementValues) {
PyMem_Free(array->elementValues);
array->elementValues = NULL;
}
break;
case DPI_NATIVE_TYPE_JSON_OBJECT:
obj = &node->value->asJsonObject;
if (obj->fields) {
for (i = 0; i < obj->numFields; i++) {
if (obj->fields[i].value)
cxoJsonBuffer_freeNode(&obj->fields[i]);
}
PyMem_Free(obj->fields);
obj->fields = NULL;
}
if (obj->fieldNames) {
PyMem_Free(obj->fieldNames);
obj->fieldNames = NULL;
}
if (obj->fieldNameLengths) {
PyMem_Free(obj->fieldNameLengths);
obj->fieldNameLengths = NULL;
}
if (obj->fieldValues) {
PyMem_Free(obj->fieldValues);
obj->fieldValues = NULL;
}
break;
}
}
//-----------------------------------------------------------------------------
// cxoJsonBuffer_free()
// Frees any memory allocated for the JSON buffer.
//-----------------------------------------------------------------------------
void cxoJsonBuffer_free(cxoJsonBuffer *buf)
{
uint32_t i;
if (buf->buffers) {
for (i = 0; i < buf->numBuffers; i++)
cxoBuffer_clear(&buf->buffers[i]);
PyMem_Free(buf->buffers);
buf->buffers = NULL;
}
cxoJsonBuffer_freeNode(&buf->topNode);
}
//-----------------------------------------------------------------------------
// cxoJsonBuffer_fromObject()
// Populate the JSON buffer from a Python object.
//-----------------------------------------------------------------------------
int cxoJsonBuffer_fromObject(cxoJsonBuffer *buf, PyObject *obj)
{
// initialize JSON buffer structure
buf->topNode.value = &buf->topNodeBuffer;
buf->allocatedBuffers = 0;
buf->numBuffers = 0;
buf->buffers = NULL;
// populate the top level node
return cxoJsonBuffer_populateNode(buf, &buf->topNode, obj);
}
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