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//-----------------------------------------------------------------------------
// Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// cxoQueue.c
// Defines the routines for handling queues (advanced queuing). These queues
// permit sending and receiving messages defined by the database.
//-----------------------------------------------------------------------------
#include "cxoModule.h"
//-----------------------------------------------------------------------------
// cxoQueue_new()
// Create a new queue (advanced queuing).
//-----------------------------------------------------------------------------
cxoQueue *cxoQueue_new(cxoConnection *conn, dpiQueue *handle)
{
dpiDeqOptions *deqOptions;
dpiEnqOptions *enqOptions;
cxoQueue *queue;
// create queue and populate basic attributes
queue = (cxoQueue*) cxoPyTypeQueue.tp_alloc(&cxoPyTypeQueue, 0);
if (!queue) {
dpiQueue_release(handle);
return NULL;
}
Py_INCREF(conn);
queue->conn = conn;
queue->handle = handle;
// get dequeue options
if (dpiQueue_getDeqOptions(queue->handle, &deqOptions) < 0) {
cxoError_raiseAndReturnNull();
Py_DECREF(queue);
return NULL;
}
queue->deqOptions = (PyObject*) cxoDeqOptions_new(conn, deqOptions);
if (!queue->deqOptions) {
Py_DECREF(queue);
return NULL;
}
// get enqueue options
if (dpiQueue_getEnqOptions(queue->handle, &enqOptions) < 0) {
cxoError_raiseAndReturnNull();
Py_DECREF(queue);
return NULL;
}
queue->enqOptions = (PyObject*) cxoEnqOptions_new(conn, enqOptions);
if (!queue->enqOptions) {
Py_DECREF(queue);
return NULL;
}
return queue;
}
//-----------------------------------------------------------------------------
// cxoQueue_free()
// Free the memory associated with a queue.
//-----------------------------------------------------------------------------
static void cxoQueue_free(cxoQueue *queue)
{
if (queue->handle) {
dpiQueue_release(queue->handle);
queue->handle = NULL;
}
Py_CLEAR(queue->conn);
Py_CLEAR(queue->name);
Py_CLEAR(queue->payloadType);
Py_CLEAR(queue->deqOptions);
Py_CLEAR(queue->enqOptions);
Py_TYPE(queue)->tp_free((PyObject*) queue);
}
//-----------------------------------------------------------------------------
// cxoQueue_repr()
// Return a string representation of a queue.
//-----------------------------------------------------------------------------
static PyObject *cxoQueue_repr(cxoQueue *queue)
{
PyObject *module, *name, *result;
if (cxoUtils_getModuleAndName(Py_TYPE(queue), &module, &name) < 0)
return NULL;
result = cxoUtils_formatString("<%s.%s %r>",
PyTuple_Pack(3, module, name, queue->name));
Py_DECREF(module);
Py_DECREF(name);
return result;
}
//-----------------------------------------------------------------------------
// cxoQueue_deqHelper()
// Helper for dequeuing messages from a queue.
//-----------------------------------------------------------------------------
int cxoQueue_deqHelper(cxoQueue *queue, uint32_t *numProps,
cxoMsgProps **props)
{
uint32_t bufferLength, i, j;
dpiMsgProps **handles;
dpiObject *objHandle;
const char *buffer;
cxoMsgProps *temp;
cxoObject *obj;
int ok, status;
// use the same array to store the intermediate values provided by ODPI-C;
// by doing so there is no need to allocate an additional array and any
// values created by this helper routine are cleaned up on error
handles = (dpiMsgProps**) props;
// perform dequeue
Py_BEGIN_ALLOW_THREADS
status = dpiQueue_deqMany(queue->handle, numProps, handles);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnInt();
// create objects that are returned to the user
for (i = 0; i < *numProps; i++) {
// create message property object
temp = cxoMsgProps_new(queue->conn, handles[i]);
ok = (temp) ? 1 : 0;
props[i] = temp;
// get payload from ODPI-C message property
if (ok && dpiMsgProps_getPayload(temp->handle, &objHandle, &buffer,
&bufferLength) < 0) {
cxoError_raiseAndReturnInt();
ok = 0;
}
// store payload on cx_Oracle message property
if (ok && objHandle) {
obj = (cxoObject*) cxoObject_new(queue->payloadType, objHandle);
if (obj && dpiObject_addRef(objHandle) < 0) {
cxoError_raiseAndReturnInt();
obj->handle = NULL;
Py_CLEAR(obj);
ok = 0;
}
temp->payload = (PyObject*) obj;
} else if (ok) {
temp->payload = PyBytes_FromStringAndSize(buffer, bufferLength);
}
// if an error occurred, do some cleanup
if (!ok || !temp->payload) {
Py_XDECREF(temp);
for (j = 0; j < i; j++)
Py_DECREF(props[j]);
for (j = i + 1; j < *numProps; j++)
dpiMsgProps_release(handles[j]);
return -1;
}
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoQueue_enqHelper()
// Helper for enqueuing messages from a queue.
//-----------------------------------------------------------------------------
int cxoQueue_enqHelper(cxoQueue *queue, uint32_t numProps,
cxoMsgProps **props)
{
dpiMsgProps **handles, *tempHandle;
cxoBuffer buffer;
cxoObject *obj;
uint32_t i;
int status;
// use the same array to store the intermediate values required by ODPI-C;
// by doing so there is no need to allocate an additional array
handles = (dpiMsgProps**) props;
// process array
for (i = 0; i < numProps; i++) {
// verify that the message property object has a payload
if (!props[i]->payload || props[i]->payload == Py_None) {
cxoError_raiseFromString(cxoProgrammingErrorException,
"message has no payload");
return -1;
}
// transfer payload to message properties object
tempHandle = props[i]->handle;
if (PyObject_IsInstance(props[i]->payload,
(PyObject*) &cxoPyTypeObject)) {
obj = (cxoObject*) props[i]->payload;
if (dpiMsgProps_setPayloadObject(props[i]->handle,
obj->handle) < 0)
return cxoError_raiseAndReturnInt();
} else {
if (cxoBuffer_fromObject(&buffer, props[i]->payload,
props[i]->encoding) < 0)
return -1;
status = dpiMsgProps_setPayloadBytes(props[i]->handle, buffer.ptr,
buffer.size);
cxoBuffer_clear(&buffer);
if (status < 0)
return cxoError_raiseAndReturnInt();
}
handles[i] = tempHandle;
}
// perform enqueue
Py_BEGIN_ALLOW_THREADS
status = dpiQueue_enqMany(queue->handle, numProps, handles);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnInt();
return 0;
}
//-----------------------------------------------------------------------------
// cxoQueue_deqMany()
// Dequeue a single message to the queue.
//-----------------------------------------------------------------------------
static PyObject *cxoQueue_deqMany(cxoQueue *queue, PyObject *args)
{
unsigned int numPropsFromPython;
uint32_t numProps, i;
cxoMsgProps **props;
PyObject *result;
if (!PyArg_ParseTuple(args, "I", &numPropsFromPython))
return NULL;
numProps = (uint32_t) numPropsFromPython;
props = PyMem_Malloc(numProps * sizeof(cxoMsgProps*));
if (!props)
return NULL;
if (cxoQueue_deqHelper(queue, &numProps, props) < 0) {
PyMem_Free(props);
return NULL;
}
result = PyList_New(numProps);
if (!result) {
for (i = 0; i < numProps; i++)
Py_DECREF(props[i]);
PyMem_Free(props);
return NULL;
}
for (i = 0; i < numProps; i++)
PyList_SET_ITEM(result, i, (PyObject*) props[i]);
PyMem_Free(props);
return result;
}
//-----------------------------------------------------------------------------
// cxoQueue_deqOne()
// Dequeue a single message to the queue.
//-----------------------------------------------------------------------------
static PyObject *cxoQueue_deqOne(cxoQueue *queue, PyObject *args)
{
uint32_t numProps = 1;
cxoMsgProps *props;
if (cxoQueue_deqHelper(queue, &numProps, &props) < 0)
return NULL;
if (numProps > 0)
return (PyObject*) props;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoQueue_enqMany()
// Enqueue multiple messages to the queue.
//-----------------------------------------------------------------------------
static PyObject *cxoQueue_enqMany(cxoQueue *queue, PyObject *args)
{
PyObject *seq, *seqCheck, *temp;
Py_ssize_t seqLength, i;
cxoMsgProps **props;
int status;
// validate arguments
if (!PyArg_ParseTuple(args, "O", &seqCheck))
return NULL;
seq = PySequence_Fast(seqCheck, "expecting sequence");
if (!seq)
return NULL;
// zero messages means nothing to do
seqLength = PySequence_Length(seq);
if (seqLength == 0) {
Py_DECREF(seq);
Py_RETURN_NONE;
}
// populate array of properties
props = PyMem_Malloc(seqLength * sizeof(cxoMsgProps*));
if (!props) {
PyErr_NoMemory();
Py_DECREF(seq);
return NULL;
}
for (i = 0; i < seqLength; i++) {
temp = PySequence_Fast_GET_ITEM(seq, i);
if (Py_TYPE(temp) != &cxoPyTypeMsgProps) {
Py_DECREF(seq);
PyMem_Free(props);
PyErr_SetString(PyExc_TypeError,
"expecting sequence of message property objects");
return NULL;
}
props[i] = (cxoMsgProps*) temp;
}
// perform enqueue
status = cxoQueue_enqHelper(queue, (uint32_t) seqLength, props);
Py_DECREF(seq);
PyMem_Free(props);
if (status < 0)
return NULL;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoQueue_enqOne()
// Enqueue a single message to the queue.
//-----------------------------------------------------------------------------
static PyObject *cxoQueue_enqOne(cxoQueue *queue, PyObject *args)
{
cxoMsgProps *props;
if (!PyArg_ParseTuple(args, "O!", &cxoPyTypeMsgProps, &props))
return NULL;
if (cxoQueue_enqHelper(queue, 1, &props) < 0)
return NULL;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// declaration of methods
//-----------------------------------------------------------------------------
static PyMethodDef cxoMethods[] = {
{ "deqMany", (PyCFunction) cxoQueue_deqMany, METH_VARARGS },
{ "deqOne", (PyCFunction) cxoQueue_deqOne, METH_NOARGS },
{ "enqMany", (PyCFunction) cxoQueue_enqMany, METH_VARARGS },
{ "enqOne", (PyCFunction) cxoQueue_enqOne, METH_VARARGS },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of members
//-----------------------------------------------------------------------------
static PyMemberDef cxoMembers[] = {
{ "connection", T_OBJECT, offsetof(cxoQueue, conn), READONLY },
{ "deqOptions", T_OBJECT, offsetof(cxoQueue, deqOptions), READONLY },
{ "enqOptions", T_OBJECT, offsetof(cxoQueue, enqOptions), READONLY },
{ "name", T_OBJECT, offsetof(cxoQueue, name), READONLY },
{ "payloadType", T_OBJECT, offsetof(cxoQueue, payloadType), READONLY },
{ NULL }
};
//-----------------------------------------------------------------------------
// Python type declarations
//-----------------------------------------------------------------------------
PyTypeObject cxoPyTypeQueue = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "cx_Oracle.Queue",
.tp_basicsize = sizeof(cxoQueue),
.tp_dealloc = (destructor) cxoQueue_free,
.tp_repr = (reprfunc) cxoQueue_repr,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_methods = cxoMethods,
.tp_members = cxoMembers
};
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