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605 lines (531 loc) · 23.1 KB
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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.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// SessionPool.c
// Handles session pooling.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// structure for the Python type "SessionPool"
//-----------------------------------------------------------------------------
typedef struct {
PyObject_HEAD
dpiPool *handle;
uint32_t minSessions;
uint32_t maxSessions;
uint32_t sessionIncrement;
uint32_t cacheSize;
dpiEncodingInfo encodingInfo;
int homogeneous;
int externalAuth;
PyObject *username;
PyObject *dsn;
PyObject *name;
PyTypeObject *connectionType;
} udt_SessionPool;
//-----------------------------------------------------------------------------
// functions for the Python type "SessionPool"
//-----------------------------------------------------------------------------
static PyObject *SessionPool_New(PyTypeObject*, PyObject*, PyObject*);
static int SessionPool_Init(udt_SessionPool*, PyObject*, PyObject*);
static void SessionPool_Free(udt_SessionPool*);
static PyObject *SessionPool_Acquire(udt_SessionPool*, PyObject*, PyObject*);
static PyObject *SessionPool_Drop(udt_SessionPool*, PyObject*);
static PyObject *SessionPool_Release(udt_SessionPool*, PyObject*, PyObject*);
static PyObject *SessionPool_GetBusyCount(udt_SessionPool*, void*);
static PyObject *SessionPool_GetGetMode(udt_SessionPool*, void*);
static PyObject *SessionPool_GetMaxLifetimeSession(udt_SessionPool*, void*);
static PyObject *SessionPool_GetOpenCount(udt_SessionPool*, void*);
static PyObject *SessionPool_GetStmtCacheSize(udt_SessionPool*, void*);
static PyObject *SessionPool_GetTimeout(udt_SessionPool*, void*);
static int SessionPool_SetGetMode(udt_SessionPool*, PyObject*, void*);
static int SessionPool_SetMaxLifetimeSession(udt_SessionPool*, PyObject*,
void*);
static int SessionPool_SetStmtCacheSize(udt_SessionPool*, PyObject*, void*);
static int SessionPool_SetTimeout(udt_SessionPool*, PyObject*, void*);
//-----------------------------------------------------------------------------
// declaration of methods for Python type "SessionPool"
//-----------------------------------------------------------------------------
static PyMethodDef g_SessionPoolMethods[] = {
{ "acquire", (PyCFunction) SessionPool_Acquire,
METH_VARARGS | METH_KEYWORDS },
{ "drop", (PyCFunction) SessionPool_Drop, METH_VARARGS },
{ "release", (PyCFunction) SessionPool_Release,
METH_VARARGS | METH_KEYWORDS },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of members for Python type "SessionPool"
//-----------------------------------------------------------------------------
static PyMemberDef g_SessionPoolMembers[] = {
{ "username", T_OBJECT, offsetof(udt_SessionPool, username), READONLY },
{ "dsn", T_OBJECT, offsetof(udt_SessionPool, dsn), READONLY },
{ "tnsentry", T_OBJECT, offsetof(udt_SessionPool, dsn), READONLY },
{ "name", T_OBJECT, offsetof(udt_SessionPool, name), READONLY },
{ "max", T_INT, offsetof(udt_SessionPool, maxSessions), READONLY },
{ "min", T_INT, offsetof(udt_SessionPool, minSessions), READONLY },
{ "increment", T_INT, offsetof(udt_SessionPool, sessionIncrement),
READONLY },
{ "homogeneous", T_INT, offsetof(udt_SessionPool, homogeneous), READONLY },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of calculated members for Python type "SessionPool"
//-----------------------------------------------------------------------------
static PyGetSetDef g_SessionPoolCalcMembers[] = {
{ "opened", (getter) SessionPool_GetOpenCount, 0, 0, 0 },
{ "busy", (getter) SessionPool_GetBusyCount, 0, 0, 0 },
{ "timeout", (getter) SessionPool_GetTimeout,
(setter) SessionPool_SetTimeout, 0, 0 },
{ "getmode", (getter) SessionPool_GetGetMode,
(setter) SessionPool_SetGetMode, 0, 0 },
{ "max_lifetime_session", (getter) SessionPool_GetMaxLifetimeSession,
(setter) SessionPool_SetMaxLifetimeSession, 0, 0 },
{ "stmtcachesize", (getter) SessionPool_GetStmtCacheSize,
(setter) SessionPool_SetStmtCacheSize, 0, 0 },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of Python type "SessionPool"
//-----------------------------------------------------------------------------
static PyTypeObject g_SessionPoolType = {
PyVarObject_HEAD_INIT(NULL, 0)
"OracleSessionPool", // tp_name
sizeof(udt_SessionPool), // tp_basicsize
0, // tp_itemsize
(destructor) SessionPool_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 | Py_TPFLAGS_BASETYPE,
// tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
g_SessionPoolMethods, // tp_methods
g_SessionPoolMembers, // tp_members
g_SessionPoolCalcMembers, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
(initproc) SessionPool_Init, // tp_init
0, // tp_alloc
(newfunc) SessionPool_New, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
#include "Connection.c"
//-----------------------------------------------------------------------------
// SessionPool_New()
// Create a new session pool object.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_New(PyTypeObject *type, PyObject *args,
PyObject *keywordArgs)
{
udt_SessionPool *newObject;
// create the object
newObject = (udt_SessionPool*) type->tp_alloc(type, 0);
if (!newObject)
return NULL;
return (PyObject*) newObject;
}
//-----------------------------------------------------------------------------
// SessionPool_Init()
// Initialize the session pool object.
//-----------------------------------------------------------------------------
static int SessionPool_Init(udt_SessionPool *self, PyObject *args,
PyObject *keywordArgs)
{
udt_Buffer userNameBuffer, passwordBuffer, dsnBuffer, editionBuffer;
PyObject *threadedObj, *eventsObj, *homogeneousObj, *passwordObj;
uint32_t minSessions, maxSessions, sessionIncrement;
PyObject *externalAuthObj, *editionObj;
dpiCommonCreateParams dpiCommonParams;
dpiPoolCreateParams dpiCreateParams;
PyTypeObject *connectionType;
const char *encoding;
int status, temp;
// define keyword arguments
static char *keywordList[] = { "user", "password", "dsn", "min", "max",
"increment", "connectiontype", "threaded", "getmode", "events",
"homogeneous", "externalauth", "encoding", "nencoding", "edition",
NULL };
// parse arguments and keywords
externalAuthObj = editionObj = NULL;
threadedObj = eventsObj = homogeneousObj = passwordObj = NULL;
connectionType = &g_ConnectionType;
if (InitializeDPI() < 0)
return -1;
if (dpiContext_initCommonCreateParams(g_DpiContext, &dpiCommonParams) < 0)
return Error_RaiseAndReturnInt();
dpiCommonParams.driverName = DRIVER_NAME;
dpiCommonParams.driverNameLength =
(uint32_t) strlen(dpiCommonParams.driverName);
if (dpiContext_initPoolCreateParams(g_DpiContext, &dpiCreateParams) < 0)
return Error_RaiseAndReturnInt();
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "OOOiii|OObOOOssO",
keywordList, &self->username, &passwordObj, &self->dsn,
&minSessions, &maxSessions, &sessionIncrement, &connectionType,
&threadedObj, &dpiCreateParams.getMode, &eventsObj,
&homogeneousObj, &externalAuthObj, &dpiCommonParams.encoding,
&dpiCommonParams.nencoding, &editionObj))
return -1;
if (!PyType_Check(connectionType)) {
PyErr_SetString(g_ProgrammingErrorException,
"connectiontype must be a type");
return -1;
}
if (!PyType_IsSubtype(connectionType, &g_ConnectionType)) {
PyErr_SetString(g_ProgrammingErrorException,
"connectiontype must be a subclass of Connection");
return -1;
}
if (GetBooleanValue(threadedObj, 0, &temp) < 0)
return -1;
if (temp)
dpiCommonParams.createMode |= DPI_MODE_CREATE_THREADED;
if (GetBooleanValue(eventsObj, 0, &temp) < 0)
return -1;
if (temp)
dpiCommonParams.createMode |= DPI_MODE_CREATE_EVENTS;
if (GetBooleanValue(externalAuthObj, 0, &dpiCreateParams.externalAuth) < 0)
return -1;
if (GetBooleanValue(homogeneousObj, 1, &dpiCreateParams.homogeneous) < 0)
return -1;
// initialize the object's members
Py_INCREF(connectionType);
self->connectionType = connectionType;
Py_INCREF(self->dsn);
Py_INCREF(self->username);
self->minSessions = minSessions;
self->maxSessions = maxSessions;
self->sessionIncrement = sessionIncrement;
self->homogeneous = dpiCreateParams.homogeneous;
self->externalAuth = dpiCreateParams.externalAuth;
// populate parameters
encoding = GetAdjustedEncoding(dpiCommonParams.encoding);
if (cxBuffer_FromObject(&userNameBuffer, self->username, encoding) < 0)
return -1;
if (cxBuffer_FromObject(&passwordBuffer, passwordObj, encoding) < 0) {
cxBuffer_Clear(&userNameBuffer);
return -1;
}
if (cxBuffer_FromObject(&dsnBuffer, self->dsn, encoding) < 0) {
cxBuffer_Clear(&userNameBuffer);
cxBuffer_Clear(&passwordBuffer);
return -1;
}
if (cxBuffer_FromObject(&editionBuffer, editionObj, encoding) < 0) {
cxBuffer_Clear(&userNameBuffer);
cxBuffer_Clear(&passwordBuffer);
cxBuffer_Clear(&dsnBuffer);
return -1;
}
dpiCreateParams.minSessions = minSessions;
dpiCreateParams.maxSessions = maxSessions;
dpiCreateParams.sessionIncrement = sessionIncrement;
// create pool
Py_BEGIN_ALLOW_THREADS
status = dpiPool_create(g_DpiContext, userNameBuffer.ptr,
userNameBuffer.size, passwordBuffer.ptr, passwordBuffer.size,
dsnBuffer.ptr, dsnBuffer.size, &dpiCommonParams, &dpiCreateParams,
&self->handle);
Py_END_ALLOW_THREADS
cxBuffer_Clear(&userNameBuffer);
cxBuffer_Clear(&passwordBuffer);
cxBuffer_Clear(&dsnBuffer);
cxBuffer_Clear(&editionBuffer);
if (status < 0)
return Error_RaiseAndReturnInt();
// get encodings and name
if (dpiPool_getEncodingInfo(self->handle, &self->encodingInfo) < 0)
return Error_RaiseAndReturnInt();
self->encodingInfo.encoding =
GetAdjustedEncoding(self->encodingInfo.encoding);
self->encodingInfo.nencoding =
GetAdjustedEncoding(self->encodingInfo.nencoding);
self->name = cxString_FromEncodedString(dpiCreateParams.outPoolName,
dpiCreateParams.outPoolNameLength, self->encodingInfo.encoding);
if (!self->name)
return -1;
return 0;
}
//-----------------------------------------------------------------------------
// SessionPool_Free()
// Deallocate the session pool.
//-----------------------------------------------------------------------------
static void SessionPool_Free(udt_SessionPool *self)
{
if (self->handle) {
dpiPool_release(self->handle);
self->handle = NULL;
}
Py_CLEAR(self->username);
Py_CLEAR(self->dsn);
Py_CLEAR(self->name);
Py_TYPE(self)->tp_free((PyObject*) self);
}
//-----------------------------------------------------------------------------
// SessionPool_Acquire()
// Create a new connection within the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_Acquire(udt_SessionPool *self, PyObject *args,
PyObject *keywordArgs)
{
static char *keywordList[] = { "user", "password", "cclass", "purity",
"tag", "matchanytag", "shardingkey", "supershardingkey", NULL };
PyObject *createKeywordArgs, *result, *cclassObj, *purityObj, *tagObj;
PyObject *shardingKeyObj, *superShardingKeyObj;
unsigned usernameLength, passwordLength;
char *username, *password;
PyObject *matchAnyTagObj;
// parse arguments
username = NULL;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "|s#s#OOOOOO",
keywordList, &username, &usernameLength, &password,
&passwordLength, &cclassObj, &purityObj, &tagObj, &matchAnyTagObj,
&shardingKeyObj, &superShardingKeyObj))
return NULL;
if (self->homogeneous && username) {
PyErr_SetString(g_ProgrammingErrorException,
"pool is homogeneous. Proxy authentication is not possible.");
return NULL;
}
// create arguments
if (keywordArgs)
createKeywordArgs = PyDict_Copy(keywordArgs);
else createKeywordArgs = PyDict_New();
if (!createKeywordArgs)
return NULL;
if (PyDict_SetItemString(createKeywordArgs, "pool",
(PyObject*) self) < 0) {
Py_DECREF(createKeywordArgs);
return NULL;
}
// create the connection object
result = PyObject_Call( (PyObject*) self->connectionType, args,
createKeywordArgs);
Py_DECREF(createKeywordArgs);
return result;
}
//-----------------------------------------------------------------------------
// SessionPool_Drop()
// Release a connection back to the session pool, dropping it so that a new
// connection will be created if needed.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_Drop(udt_SessionPool *self, PyObject *args)
{
udt_Connection *connection;
int status;
// connection is expected
if (!PyArg_ParseTuple(args, "O!", &g_ConnectionType, &connection))
return NULL;
// release the connection
Py_BEGIN_ALLOW_THREADS
status = dpiConn_close(connection->handle, DPI_MODE_CONN_CLOSE_DROP, NULL,
0);
Py_END_ALLOW_THREADS
if (status < 0)
return Error_RaiseAndReturnNull();
// mark connection as closed
Py_CLEAR(connection->sessionPool);
dpiConn_release(connection->handle);
connection->handle = NULL;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// SessionPool_Release()
// Release a connection back to the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_Release(udt_SessionPool *self, PyObject *args,
PyObject *keywordArgs)
{
static char *keywordList[] = { "connection", "tag", NULL };
udt_Connection *connection;
dpiConnCloseMode mode;
udt_Buffer tagBuffer;
PyObject *tagObj;
int status;
// parse arguments
tagObj = NULL;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "O!|O",
keywordList, &g_ConnectionType, &connection, &tagObj))
return NULL;
if (cxBuffer_FromObject(&tagBuffer, tagObj,
self->encodingInfo.encoding) < 0)
return NULL;
mode = (tagBuffer.size > 0) ? DPI_MODE_CONN_CLOSE_RETAG :
DPI_MODE_CONN_CLOSE_DEFAULT;
Py_BEGIN_ALLOW_THREADS
status = dpiConn_close(connection->handle, mode, (char*) tagBuffer.ptr,
tagBuffer.size);
Py_END_ALLOW_THREADS
cxBuffer_Clear(&tagBuffer);
if (status < 0)
return Error_RaiseAndReturnNull();
// mark connection as closed
Py_CLEAR(connection->sessionPool);
dpiConn_release(connection->handle);
connection->handle = NULL;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// SessionPool_GetAttribute()
// Return the value for the attribute.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetAttribute(udt_SessionPool *self,
int (*func)(dpiPool *pool, uint32_t *value))
{
uint32_t value;
if ((*func)(self->handle, &value) < 0)
return Error_RaiseAndReturnNull();
#if PY_MAJOR_VERSION >= 3
return PyInt_FromUnsignedLong(value);
#else
return PyInt_FromLong(value);
#endif
}
//-----------------------------------------------------------------------------
// SessionPool_SetAttribute()
// Set the value of the OCI attribute.
//-----------------------------------------------------------------------------
static int SessionPool_SetAttribute(udt_SessionPool *self, PyObject *value,
int (*func)(dpiPool *pool, uint32_t value))
{
uint32_t cValue;
if (!PyInt_Check(value)) {
PyErr_SetString(PyExc_TypeError, "value must be an integer");
return -1;
}
#if PY_MAJOR_VERSION >= 3
cValue = PyInt_AsUnsignedLong(value);
#else
cValue = PyInt_AsLong(value);
#endif
if (PyErr_Occurred())
return -1;
if ((*func)(self->handle, cValue) < 0)
return Error_RaiseAndReturnInt();
return 0;
}
//-----------------------------------------------------------------------------
// SessionPool_GetBusyCount()
// Return the number of busy connections in the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetBusyCount(udt_SessionPool *pool, void *unused)
{
return SessionPool_GetAttribute(pool, dpiPool_getBusyCount);
}
//-----------------------------------------------------------------------------
// SessionPool_GetGetMode()
// Return the "get" mode for connections in the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetGetMode(udt_SessionPool *pool, void *unused)
{
dpiPoolGetMode value;
if (dpiPool_getGetMode(pool->handle, &value) < 0)
return Error_RaiseAndReturnNull();
return PyInt_FromLong(value);
}
//-----------------------------------------------------------------------------
// SessionPool_GetMaxLifetimeSession()
// Return the maximum lifetime session of connections in the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetMaxLifetimeSession(udt_SessionPool *pool,
void *unused)
{
return SessionPool_GetAttribute(pool, dpiPool_getMaxLifetimeSession);
}
//-----------------------------------------------------------------------------
// SessionPool_GetOpenCount()
// Return the number of open connections in the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetOpenCount(udt_SessionPool *pool, void *unused)
{
return SessionPool_GetAttribute(pool, dpiPool_getOpenCount);
}
//-----------------------------------------------------------------------------
// SessionPool_GetStmtCacheSize()
// Return the size of the statement cache to use in connections that are
// acquired from the pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetStmtCacheSize(udt_SessionPool *pool,
void *unused)
{
return SessionPool_GetAttribute(pool, dpiPool_getStmtCacheSize);
}
//-----------------------------------------------------------------------------
// SessionPool_GetTimeout()
// Return the timeout for connections in the session pool.
//-----------------------------------------------------------------------------
static PyObject *SessionPool_GetTimeout(udt_SessionPool *pool, void *unused)
{
return SessionPool_GetAttribute(pool, dpiPool_getTimeout);
}
//-----------------------------------------------------------------------------
// SessionPool_SetGetMode()
// Set the "get" mode for connections in the session pool.
//-----------------------------------------------------------------------------
static int SessionPool_SetGetMode(udt_SessionPool *pool, PyObject *value,
void *unused)
{
dpiPoolGetMode cValue;
cValue = PyInt_AsLong(value);
if (PyErr_Occurred())
return -1;
if (dpiPool_setGetMode(pool->handle, cValue) < 0)
return Error_RaiseAndReturnInt();
return 0;
}
//-----------------------------------------------------------------------------
// SessionPool_SetMaxLifetimeSession()
// Set the maximum lifetime for connections in the session pool.
//-----------------------------------------------------------------------------
static int SessionPool_SetMaxLifetimeSession(udt_SessionPool *pool,
PyObject *value, void *unused)
{
return SessionPool_SetAttribute(pool, value,
dpiPool_setMaxLifetimeSession);
}
//-----------------------------------------------------------------------------
// SessionPool_SetStmtCacheSize()
// Set the default size of the statement cache used for connections that are
// acquired from the pool.
//-----------------------------------------------------------------------------
static int SessionPool_SetStmtCacheSize(udt_SessionPool *pool,
PyObject *value, void *unused)
{
return SessionPool_SetAttribute(pool, value, dpiPool_setStmtCacheSize);
}
//-----------------------------------------------------------------------------
// SessionPool_SetTimeout()
// Set the timeout for connections in the session pool.
//-----------------------------------------------------------------------------
static int SessionPool_SetTimeout(udt_SessionPool *pool, PyObject *value,
void *unused)
{
return SessionPool_SetAttribute(pool, value, dpiPool_setTimeout);
}
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