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//-----------------------------------------------------------------------------
// Copyright 2016, 2017, Oracle and/or its affiliates. All rights reserved.
//
// Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
//
// Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
// Canada. All rights reserved.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Subscription.c
// Defines the routines for handling Oracle subscription information.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// structures used for handling subscriptions
//-----------------------------------------------------------------------------
typedef struct {
PyObject_HEAD
dpiSubscr *handle;
udt_Connection *connection;
PyObject *callback;
uint32_t namespace;
uint32_t protocol;
uint32_t port;
uint32_t timeout;
uint32_t operations;
uint32_t qos;
uint64_t id;
} udt_Subscription;
typedef struct {
PyObject_HEAD
udt_Subscription *subscription;
dpiEventType type;
PyObject *dbname;
PyObject *txId;
PyObject *tables;
PyObject *queries;
} udt_Message;
typedef struct {
PyObject_HEAD
PyObject *name;
PyObject *rows;
dpiOpCode operation;
} udt_MessageTable;
typedef struct {
PyObject_HEAD
PyObject *rowid;
dpiOpCode operation;
} udt_MessageRow;
typedef struct {
PyObject_HEAD
uint64_t id;
dpiOpCode operation;
PyObject *tables;
} udt_MessageQuery;
//-----------------------------------------------------------------------------
// Declaration of subscription functions
//-----------------------------------------------------------------------------
static void Subscription_Free(udt_Subscription*);
static PyObject *Subscription_Repr(udt_Subscription*);
static PyObject *Subscription_RegisterQuery(udt_Subscription*, PyObject*);
static void Message_Free(udt_Message*);
static void MessageTable_Free(udt_MessageTable*);
static void MessageRow_Free(udt_MessageRow*);
static void MessageQuery_Free(udt_MessageQuery*);
//-----------------------------------------------------------------------------
// declaration of members for Python types
//-----------------------------------------------------------------------------
static PyMemberDef g_SubscriptionTypeMembers[] = {
{ "callback", T_OBJECT, offsetof(udt_Subscription, callback), READONLY },
{ "connection", T_OBJECT, offsetof(udt_Subscription, connection),
READONLY },
{ "namespace", T_INT, offsetof(udt_Subscription, namespace), READONLY },
{ "protocol", T_INT, offsetof(udt_Subscription, protocol), READONLY },
{ "port", T_INT, offsetof(udt_Subscription, port), READONLY },
{ "timeout", T_INT, offsetof(udt_Subscription, timeout), READONLY },
{ "operations", T_INT, offsetof(udt_Subscription, operations), READONLY },
{ "qos", T_INT, offsetof(udt_Subscription, qos), READONLY },
{ "id", T_ULONG, offsetof(udt_Subscription, id), READONLY },
{ NULL }
};
static PyMemberDef g_MessageTypeMembers[] = {
{ "subscription", T_OBJECT, offsetof(udt_Message, subscription),
READONLY },
{ "type", T_INT, offsetof(udt_Message, type), READONLY },
{ "dbname", T_OBJECT, offsetof(udt_Message, dbname), READONLY },
{ "txid", T_OBJECT, offsetof(udt_Message, txId), READONLY },
{ "tables", T_OBJECT, offsetof(udt_Message, tables), READONLY },
{ "queries", T_OBJECT, offsetof(udt_Message, queries), READONLY },
{ NULL }
};
static PyMemberDef g_MessageTableTypeMembers[] = {
{ "name", T_OBJECT, offsetof(udt_MessageTable, name), READONLY },
{ "rows", T_OBJECT, offsetof(udt_MessageTable, rows), READONLY },
{ "operation", T_INT, offsetof(udt_MessageTable, operation), READONLY },
{ NULL }
};
static PyMemberDef g_MessageRowTypeMembers[] = {
{ "rowid", T_OBJECT, offsetof(udt_MessageRow, rowid), READONLY },
{ "operation", T_INT, offsetof(udt_MessageRow, operation), READONLY },
{ NULL }
};
static PyMemberDef g_MessageQueryTypeMembers[] = {
{ "id", T_INT, offsetof(udt_MessageQuery, id), READONLY },
{ "operation", T_INT, offsetof(udt_MessageQuery, operation), READONLY },
{ "tables", T_OBJECT, offsetof(udt_MessageQuery, tables), READONLY },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of methods for Python types
//-----------------------------------------------------------------------------
static PyMethodDef g_SubscriptionTypeMethods[] = {
{ "registerquery", (PyCFunction) Subscription_RegisterQuery,
METH_VARARGS },
{ NULL, NULL }
};
//-----------------------------------------------------------------------------
// Python type declarations
//-----------------------------------------------------------------------------
static PyTypeObject g_SubscriptionType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.Subscription", // tp_name
sizeof(udt_Subscription), // tp_basicsize
0, // tp_itemsize
(destructor) Subscription_Free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
(reprfunc) Subscription_Repr, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
g_SubscriptionTypeMethods, // tp_methods
g_SubscriptionTypeMembers, // tp_members
0, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
0, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
static PyTypeObject g_MessageType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.Message", // tp_name
sizeof(udt_Message), // tp_basicsize
0, // tp_itemsize
(destructor) Message_Free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
0, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
0, // tp_methods
g_MessageTypeMembers, // tp_members
0, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
0, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
static PyTypeObject g_MessageTableType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.MessageTable", // tp_name
sizeof(udt_MessageTable), // tp_basicsize
0, // tp_itemsize
(destructor) MessageTable_Free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
0, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
0, // tp_methods
g_MessageTableTypeMembers, // tp_members
0, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
0, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
static PyTypeObject g_MessageRowType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.MessageRow", // tp_name
sizeof(udt_MessageRow), // tp_basicsize
0, // tp_itemsize
(destructor) MessageRow_Free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
0, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
0, // tp_methods
g_MessageRowTypeMembers, // tp_members
0, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
0, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
static PyTypeObject g_MessageQueryType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.MessageQuery", // tp_name
sizeof(udt_MessageQuery), // tp_basicsize
0, // tp_itemsize
(destructor) MessageQuery_Free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
0, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
0, // tp_methods
g_MessageQueryTypeMembers, // tp_members
0, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
0, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
//-----------------------------------------------------------------------------
// MessageRow_Initialize()
// Initialize a new message row with the information from the descriptor.
//-----------------------------------------------------------------------------
static int MessageRow_Initialize(udt_MessageRow *self, const char *encoding,
dpiSubscrMessageRow *row)
{
self->operation = row->operation;
self->rowid = cxString_FromEncodedString(row->rowid, row->rowidLength,
encoding);
if (!self->rowid)
return -1;
return 0;
}
//-----------------------------------------------------------------------------
// MessageTable_Initialize()
// Initialize a new message table with the information from the descriptor.
//-----------------------------------------------------------------------------
static int MessageTable_Initialize(udt_MessageTable *self,
const char *encoding, dpiSubscrMessageTable *table)
{
udt_MessageRow *row;
uint32_t i;
self->operation = table->operation;
self->name = cxString_FromEncodedString(table->name, table->nameLength,
encoding);
self->rows = PyList_New(table->numRows);
if (!self->rows)
return -1;
for (i = 0; i < table->numRows; i++) {
row = (udt_MessageRow*)
g_MessageRowType.tp_alloc(&g_MessageRowType, 0);
if (!row)
return -1;
PyList_SET_ITEM(self->rows, i, (PyObject*) row);
if (MessageRow_Initialize(row, encoding, &table->rows[i]) < 0)
return -1;
}
return 0;
}
//-----------------------------------------------------------------------------
// MessageQuery_Initialize()
// Initialize a new message query with the information from the descriptor.
//-----------------------------------------------------------------------------
static int MessageQuery_Initialize(udt_MessageQuery *self,
const char *encoding, dpiSubscrMessageQuery *query)
{
udt_MessageTable *table;
uint32_t i;
self->id = query->id;
self->operation = query->operation;
self->tables = PyList_New(query->numTables);
if (!self->tables)
return -1;
for (i = 0; i < query->numTables; i++) {
table = (udt_MessageTable*)
g_MessageTableType.tp_alloc(&g_MessageTableType, 0);
if (!table)
return -1;
PyList_SET_ITEM(self->tables, i, (PyObject*) table);
if (MessageTable_Initialize(table, encoding, &query->tables[i]) < 0)
return -1;
}
return 0;
}
//-----------------------------------------------------------------------------
// Message_Initialize()
// Initialize a new message with the information from the descriptor.
//-----------------------------------------------------------------------------
static int Message_Initialize(udt_Message *self,
udt_Subscription *subscription, dpiSubscrMessage *message)
{
udt_MessageTable *table;
udt_MessageQuery *query;
const char *encoding;
uint32_t i;
Py_INCREF(subscription);
self->subscription = subscription;
encoding = subscription->connection->encodingInfo.encoding;
self->type = message->eventType;
self->dbname = cxString_FromEncodedString(message->dbName,
message->dbNameLength, encoding);
if (!self->dbname)
return -1;
if (message->txId) {
self->txId = PyBytes_FromStringAndSize(message->txId,
message->txIdLength);
if (!self->txId)
return -1;
}
switch (message->eventType) {
case DPI_EVENT_OBJCHANGE:
self->tables = PyList_New(message->numTables);
if (!self->tables)
return -1;
for (i = 0; i < message->numTables; i++) {
table = (udt_MessageTable*)
g_MessageTableType.tp_alloc(&g_MessageTableType, 0);
if (!table)
return -1;
PyList_SET_ITEM(self->tables, i, (PyObject*) table);
if (MessageTable_Initialize(table, encoding,
&message->tables[i]) < 0)
return -1;
}
break;
case DPI_EVENT_QUERYCHANGE:
self->queries = PyList_New(message->numQueries);
if (!self->queries)
return -1;
for (i = 0; i < message->numQueries; i++) {
query = (udt_MessageQuery*)
g_MessageQueryType.tp_alloc(&g_MessageQueryType, 0);
if (!query)
return -1;
PyList_SET_ITEM(self->queries, i, (PyObject*) query);
if (MessageQuery_Initialize(query, encoding,
&message->queries[i]) < 0)
return -1;
}
break;
default:
break;
}
return 0;
}
//-----------------------------------------------------------------------------
// Subscription_CallbackHandler()
// Routine that performs the actual call.
//-----------------------------------------------------------------------------
static int Subscription_CallbackHandler(udt_Subscription *self,
dpiSubscrMessage *message)
{
PyObject *result, *args;
udt_Message *messageObj;
// create the message
messageObj = (udt_Message*) g_MessageType.tp_alloc(&g_MessageType, 0);
if (!messageObj)
return -1;
if (Message_Initialize(messageObj, self, message) < 0) {
Py_DECREF(messageObj);
return -1;
}
// create the arguments for the call
args = PyTuple_Pack(1, messageObj);
Py_DECREF(messageObj);
if (!args)
return -1;
// make the actual call
result = PyObject_Call(self->callback, args, NULL);
Py_DECREF(args);
if (!result)
return -1;
Py_DECREF(result);
return 0;
}
//-----------------------------------------------------------------------------
// Subscription_Callback()
// Routine that is called when a callback needs to be invoked.
//-----------------------------------------------------------------------------
static void Subscription_Callback(udt_Subscription *self,
dpiSubscrMessage *message)
{
#ifdef WITH_THREAD
PyGILState_STATE gstate = PyGILState_Ensure();
#endif
if (message->errorInfo) {
Error_RaiseFromInfo(message->errorInfo);
PyErr_Print();
} else if (Subscription_CallbackHandler(self, message) < 0)
PyErr_Print();
#ifdef WITH_THREAD
PyGILState_Release(gstate);
#endif
}
//-----------------------------------------------------------------------------
// Subscription_New()
// Allocate a new subscription object.
//-----------------------------------------------------------------------------
static udt_Subscription *Subscription_New(udt_Connection *connection,
uint32_t namespace, uint32_t protocol, uint32_t port,
PyObject *callback, uint32_t timeout, uint32_t operations,
uint32_t qos)
{
dpiSubscrCreateParams params;
udt_Subscription *self;
self = (udt_Subscription*)
g_SubscriptionType.tp_alloc(&g_SubscriptionType, 0);
if (!self)
return NULL;
Py_INCREF(connection);
self->connection = connection;
Py_XINCREF(callback);
self->callback = callback;
self->namespace = namespace;
self->protocol = protocol;
self->port = port;
self->timeout = timeout;
self->operations = operations;
self->qos = qos;
if (dpiContext_initSubscrCreateParams(g_DpiContext, ¶ms) < 0) {
Error_RaiseAndReturnNull();
return NULL;
}
params.subscrNamespace = namespace;
params.protocol = protocol;
params.portNumber = port;
if (callback) {
params.callback = (dpiSubscrCallback) Subscription_Callback;
params.callbackContext = self;
}
params.timeout = timeout;
params.operations = operations;
params.qos = qos;
if (dpiConn_newSubscription(connection->handle, ¶ms, &self->handle,
&self->id) < 0) {
Error_RaiseAndReturnNull();
Py_DECREF(self);
return NULL;
}
return self;
}
//-----------------------------------------------------------------------------
// Subscription_Free()
// Free the memory associated with a subscription.
//-----------------------------------------------------------------------------
static void Subscription_Free(udt_Subscription *self)
{
if (self->handle) {
dpiSubscr_release(self->handle);
self->handle = NULL;
}
Py_CLEAR(self->connection);
Py_CLEAR(self->callback);
Py_TYPE(self)->tp_free((PyObject*) self);
}
//-----------------------------------------------------------------------------
// Subscription_Repr()
// Return a string representation of the subscription.
//-----------------------------------------------------------------------------
static PyObject *Subscription_Repr(udt_Subscription *subscription)
{
PyObject *connectionRepr, *module, *name, *result, *format, *formatArgs;
format = cxString_FromAscii("<%s.%s on %s>");
if (!format)
return NULL;
connectionRepr = PyObject_Repr((PyObject*) subscription->connection);
if (!connectionRepr) {
Py_DECREF(format);
return NULL;
}
if (GetModuleAndName(Py_TYPE(subscription), &module, &name) < 0) {
Py_DECREF(format);
Py_DECREF(connectionRepr);
return NULL;
}
formatArgs = PyTuple_Pack(3, module, name, connectionRepr);
Py_DECREF(module);
Py_DECREF(name);
Py_DECREF(connectionRepr);
if (!formatArgs) {
Py_DECREF(format);
return NULL;
}
result = cxString_Format(format, formatArgs);
Py_DECREF(format);
Py_DECREF(formatArgs);
return result;
}
//-----------------------------------------------------------------------------
// Subscription_RegisterQuery()
// Register a query for database change notification.
//-----------------------------------------------------------------------------
static PyObject *Subscription_RegisterQuery(udt_Subscription *self,
PyObject *args)
{
PyObject *statement, *executeArgs;
udt_Buffer statementBuffer;
uint32_t numQueryColumns;
udt_Cursor *cursor;
uint64_t queryId;
int status;
// parse arguments
executeArgs = NULL;
if (!PyArg_ParseTuple(args, "O!|O", cxString_Type, &statement,
&executeArgs))
return NULL;
if (executeArgs) {
if (!PyDict_Check(executeArgs) && !PySequence_Check(executeArgs)) {
PyErr_SetString(PyExc_TypeError,
"expecting a dictionary or sequence");
return NULL;
}
}
// create cursor to perform query
cursor = (udt_Cursor*) PyObject_CallMethod((PyObject*) self->connection,
"cursor", NULL);
if (!cursor)
return NULL;
// prepare the statement for execution
if (cxBuffer_FromObject(&statementBuffer, statement,
self->connection->encodingInfo.encoding) < 0) {
Py_DECREF(cursor);
return NULL;
}
status = dpiSubscr_prepareStmt(self->handle, statementBuffer.ptr,
statementBuffer.size, &cursor->handle);
cxBuffer_Clear(&statementBuffer);
if (status < 0) {
Error_RaiseAndReturnNull();
Py_DECREF(cursor);
return NULL;
}
// perform binds
if (executeArgs && Cursor_SetBindVariables(cursor, executeArgs, 1, 0,
0) < 0) {
Py_DECREF(cursor);
return NULL;
}
if (Cursor_PerformBind(cursor) < 0) {
Py_DECREF(cursor);
return NULL;
}
// perform the execute (which registers the query)
Py_BEGIN_ALLOW_THREADS
status = dpiStmt_execute(cursor->handle, DPI_MODE_EXEC_DEFAULT,
&numQueryColumns);
Py_END_ALLOW_THREADS
if (status < 0) {
Error_RaiseAndReturnNull();
Py_DECREF(cursor);
return NULL;
}
// return the query id, if applicable
if (self->qos & DPI_SUBSCR_QOS_QUERY) {
if (dpiStmt_getSubscrQueryId(cursor->handle, &queryId) < 0) {
Error_RaiseAndReturnNull();
Py_DECREF(cursor);
return NULL;
}
Py_DECREF(cursor);
return PyInt_FromLong((long) queryId);
}
Py_DECREF(cursor);
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// Message_Free()
// Free the memory associated with a message.
//-----------------------------------------------------------------------------
static void Message_Free(udt_Message *self)
{
Py_CLEAR(self->subscription);
Py_CLEAR(self->dbname);
Py_CLEAR(self->tables);
Py_CLEAR(self->queries);
Py_TYPE(self)->tp_free((PyObject*) self);
}
//-----------------------------------------------------------------------------
// MessageTable_Free()
// Free the memory associated with a table in a message.
//-----------------------------------------------------------------------------
static void MessageTable_Free(udt_MessageTable *self)
{
Py_CLEAR(self->name);
Py_CLEAR(self->rows);
Py_TYPE(self)->tp_free((PyObject*) self);
}
//-----------------------------------------------------------------------------
// MessageRow_Free()
// Free the memory associated with a row in a message.
//-----------------------------------------------------------------------------
static void MessageRow_Free(udt_MessageRow *self)
{
Py_CLEAR(self->rowid);
Py_TYPE(self)->tp_free((PyObject*) self);
}
//-----------------------------------------------------------------------------
// MessageQuery_Free()
// Free the memory associated with a query in a message.
//-----------------------------------------------------------------------------
static void MessageQuery_Free(udt_MessageQuery *self)
{
Py_CLEAR(self->tables);
Py_TYPE(self)->tp_free((PyObject*) self);
}
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