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connection.c
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2704 lines (2328 loc) · 78.5 KB
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/* connection.c - the connection type
*
* Copyright (C) 2004-2010 Gerhard Häring <gh@ghaering.de>
*
* This file is part of pysqlite.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "module.h"
#include "connection.h"
#include "statement.h"
#include "cursor.h"
#include "blob.h"
#include "prepare_protocol.h"
#include "util.h"
#include "pycore_modsupport.h" // _PyArg_NoKeywords()
#include "pycore_pyerrors.h" // _PyErr_ChainExceptions1()
#include "pycore_pylifecycle.h" // _Py_IsInterpreterFinalizing()
#include "pycore_unicodeobject.h" // _PyUnicode_AsUTF8NoNUL
#include <stdbool.h>
#if SQLITE_VERSION_NUMBER >= 3025000
#define HAVE_WINDOW_FUNCTIONS
#endif
static const char *
get_isolation_level(const char *level)
{
assert(level != NULL);
static const char *const allowed_levels[] = {
"",
"DEFERRED",
"IMMEDIATE",
"EXCLUSIVE",
NULL
};
for (int i = 0; allowed_levels[i] != NULL; i++) {
const char *candidate = allowed_levels[i];
if (sqlite3_stricmp(level, candidate) == 0) {
return candidate;
}
}
PyErr_SetString(PyExc_ValueError,
"isolation_level string must be '', 'DEFERRED', "
"'IMMEDIATE', or 'EXCLUSIVE'");
return NULL;
}
static int
isolation_level_converter(PyObject *str_or_none, const char **result)
{
if (Py_IsNone(str_or_none)) {
*result = NULL;
}
else if (PyUnicode_Check(str_or_none)) {
const char *str = _PyUnicode_AsUTF8NoNUL(str_or_none);
if (str == NULL) {
return 0;
}
const char *level = get_isolation_level(str);
if (level == NULL) {
return 0;
}
*result = level;
}
else {
PyErr_SetString(PyExc_TypeError,
"isolation_level must be str or None");
return 0;
}
return 1;
}
static int
autocommit_converter(PyObject *val, enum autocommit_mode *result)
{
if (Py_IsTrue(val)) {
*result = AUTOCOMMIT_ENABLED;
return 1;
}
if (Py_IsFalse(val)) {
*result = AUTOCOMMIT_DISABLED;
return 1;
}
if (PyLong_Check(val) &&
PyLong_AsLong(val) == LEGACY_TRANSACTION_CONTROL)
{
*result = AUTOCOMMIT_LEGACY;
return 1;
}
PyErr_SetString(PyExc_ValueError,
"autocommit must be True, False, or "
"sqlite3.LEGACY_TRANSACTION_CONTROL");
return 0;
}
static int
sqlite3_int64_converter(PyObject *obj, sqlite3_int64 *result)
{
if (!PyLong_Check(obj)) {
PyErr_SetString(PyExc_TypeError, "expected 'int'");
return 0;
}
*result = _pysqlite_long_as_int64(obj);
if (PyErr_Occurred()) {
return 0;
}
return 1;
}
#define clinic_state() (pysqlite_get_state_by_type(Py_TYPE(self)))
#include "clinic/connection.c.h"
#undef clinic_state
#define _pysqlite_Connection_CAST(op) ((pysqlite_Connection *)(op))
/*[clinic input]
module _sqlite3
class _sqlite3.Connection "pysqlite_Connection *" "clinic_state()->ConnectionType"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=67369db2faf80891]*/
static void incref_callback_context(callback_context *ctx);
static void decref_callback_context(callback_context *ctx);
static void set_callback_context(callback_context **ctx_pp,
callback_context *ctx);
static int connection_close(pysqlite_Connection *self);
PyObject *_pysqlite_query_execute(pysqlite_Cursor *, int, PyObject *, PyObject *);
static PyObject *
new_statement_cache(pysqlite_Connection *self, pysqlite_state *state,
int maxsize)
{
PyObject *args[] = { NULL, PyLong_FromLong(maxsize), };
if (args[1] == NULL) {
return NULL;
}
PyObject *lru_cache = state->lru_cache;
size_t nargsf = 1 | PY_VECTORCALL_ARGUMENTS_OFFSET;
PyObject *inner = PyObject_Vectorcall(lru_cache, args + 1, nargsf, NULL);
Py_DECREF(args[1]);
if (inner == NULL) {
return NULL;
}
args[1] = (PyObject *)self; // Borrowed ref.
nargsf = 1 | PY_VECTORCALL_ARGUMENTS_OFFSET;
PyObject *res = PyObject_Vectorcall(inner, args + 1, nargsf, NULL);
Py_DECREF(inner);
return res;
}
static inline int
connection_exec_stmt(pysqlite_Connection *self, const char *sql)
{
int rc;
Py_BEGIN_ALLOW_THREADS
int len = (int)strlen(sql) + 1;
sqlite3_stmt *stmt;
rc = sqlite3_prepare_v2(self->db, sql, len, &stmt, NULL);
if (rc == SQLITE_OK) {
(void)sqlite3_step(stmt);
rc = sqlite3_finalize(stmt);
}
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
set_error_from_db(self->state, self->db);
return -1;
}
return 0;
}
/*[python input]
class IsolationLevel_converter(CConverter):
type = "const char *"
converter = "isolation_level_converter"
class Autocommit_converter(CConverter):
type = "enum autocommit_mode"
converter = "autocommit_converter"
class sqlite3_int64_converter(CConverter):
type = "sqlite3_int64"
converter = "sqlite3_int64_converter"
[python start generated code]*/
/*[python end generated code: output=da39a3ee5e6b4b0d input=dff8760fb1eba6a1]*/
/*[clinic input]
_sqlite3.Connection.__init__ as pysqlite_connection_init
database: object
*
timeout: double = 5.0
detect_types: int = 0
isolation_level: IsolationLevel = ""
check_same_thread: bool = True
factory: object(c_default='(PyObject*)clinic_state()->ConnectionType') = ConnectionType
cached_statements as cache_size: int = 128
uri: bool = False
autocommit: Autocommit(c_default='LEGACY_TRANSACTION_CONTROL') = sqlite3.LEGACY_TRANSACTION_CONTROL
[clinic start generated code]*/
static int
pysqlite_connection_init_impl(pysqlite_Connection *self, PyObject *database,
double timeout, int detect_types,
const char *isolation_level,
int check_same_thread, PyObject *factory,
int cache_size, int uri,
enum autocommit_mode autocommit)
/*[clinic end generated code: output=cba057313ea7712f input=5ca4883d8747a49b]*/
{
if (PySys_Audit("sqlite3.connect", "O", database) < 0) {
return -1;
}
PyObject *bytes;
if (!PyUnicode_FSConverter(database, &bytes)) {
return -1;
}
if (self->initialized) {
self->initialized = 0;
PyTypeObject *tp = Py_TYPE(self);
tp->tp_clear((PyObject *)self);
if (connection_close(self) < 0) {
return -1;
}
}
// Create and configure SQLite database object.
sqlite3 *db;
int rc;
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_open_v2(PyBytes_AS_STRING(bytes), &db,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
(uri ? SQLITE_OPEN_URI : 0), NULL);
if (rc == SQLITE_OK) {
(void)sqlite3_busy_timeout(db, (int)(timeout*1000));
}
Py_END_ALLOW_THREADS
Py_DECREF(bytes);
if (db == NULL && rc == SQLITE_NOMEM) {
PyErr_NoMemory();
return -1;
}
pysqlite_state *state = pysqlite_get_state_by_type(Py_TYPE(self));
if (rc != SQLITE_OK) {
set_error_from_db(state, db);
goto error;
}
// Create LRU statement cache; returns a new reference.
PyObject *statement_cache = new_statement_cache(self, state, cache_size);
if (statement_cache == NULL) {
goto error;
}
/* Create lists of weak references to blobs */
PyObject *blobs = PyList_New(0);
if (blobs == NULL) {
Py_DECREF(statement_cache);
goto error;
}
// Init connection state members.
self->db = db;
self->state = state;
self->detect_types = detect_types;
self->isolation_level = isolation_level;
self->autocommit = autocommit;
self->check_same_thread = check_same_thread;
self->thread_ident = PyThread_get_thread_ident();
self->statement_cache = statement_cache;
self->blobs = blobs;
self->row_factory = Py_NewRef(Py_None);
self->text_factory = Py_NewRef(&PyUnicode_Type);
self->trace_ctx = NULL;
self->progress_ctx = NULL;
self->authorizer_ctx = NULL;
// Borrowed refs
self->Warning = state->Warning;
self->Error = state->Error;
self->InterfaceError = state->InterfaceError;
self->DatabaseError = state->DatabaseError;
self->DataError = state->DataError;
self->OperationalError = state->OperationalError;
self->IntegrityError = state->IntegrityError;
self->InternalError = state->InternalError;
self->ProgrammingError = state->ProgrammingError;
self->NotSupportedError = state->NotSupportedError;
if (PySys_Audit("sqlite3.connect/handle", "O", self) < 0) {
return -1; // Don't goto error; at this point, dealloc will clean up.
}
self->initialized = 1;
if (autocommit == AUTOCOMMIT_DISABLED) {
if (connection_exec_stmt(self, "BEGIN") < 0) {
return -1;
}
}
return 0;
error:
// There are no statements or other SQLite objects attached to the
// database, so sqlite3_close() should always return SQLITE_OK.
rc = sqlite3_close(db);
assert(rc == SQLITE_OK);
return -1;
}
/*[clinic input]
# Create a new destination 'connect' for the docstring and methoddef only.
# This makes it possible to keep the signatures for Connection.__init__ and
# sqlite3.connect() synchronised.
output push
destination connect new file '{dirname}/clinic/_sqlite3.connect.c.h'
# Only output the docstring and the PyMethodDef entry.
output everything suppress
output docstring_definition connect
output methoddef_define connect
# Define the sqlite3.connect function by cloning Connection.__init__.
_sqlite3.connect as pysqlite_connect = _sqlite3.Connection.__init__
Open a connection to the SQLite database file 'database'.
You can use ":memory:" to open a database connection to a database that
resides in RAM instead of on disk.
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=92260edff95d1720]*/
/*[clinic input]
# Restore normal Argument Clinic operation for the rest of this file.
output pop
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b899ba9273edcce7]*/
#define VISIT_CALLBACK_CONTEXT(ctx) \
do { \
if (ctx) { \
Py_VISIT(ctx->callable); \
Py_VISIT(ctx->module); \
} \
} while (0)
static int
connection_traverse(PyObject *op, visitproc visit, void *arg)
{
pysqlite_Connection *self = _pysqlite_Connection_CAST(op);
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->statement_cache);
Py_VISIT(self->blobs);
Py_VISIT(self->row_factory);
Py_VISIT(self->text_factory);
VISIT_CALLBACK_CONTEXT(self->trace_ctx);
VISIT_CALLBACK_CONTEXT(self->progress_ctx);
VISIT_CALLBACK_CONTEXT(self->authorizer_ctx);
#undef VISIT_CALLBACK_CONTEXT
return 0;
}
static inline void
clear_callback_context(callback_context *ctx)
{
if (ctx != NULL) {
Py_CLEAR(ctx->callable);
Py_CLEAR(ctx->module);
}
}
static int
connection_clear(PyObject *op)
{
pysqlite_Connection *self = _pysqlite_Connection_CAST(op);
Py_CLEAR(self->statement_cache);
Py_CLEAR(self->blobs);
Py_CLEAR(self->row_factory);
Py_CLEAR(self->text_factory);
clear_callback_context(self->trace_ctx);
clear_callback_context(self->progress_ctx);
clear_callback_context(self->authorizer_ctx);
return 0;
}
static void
free_callback_contexts(pysqlite_Connection *self)
{
set_callback_context(&self->trace_ctx, NULL);
set_callback_context(&self->progress_ctx, NULL);
set_callback_context(&self->authorizer_ctx, NULL);
}
static void
remove_callbacks(sqlite3 *db)
{
/* None of these APIs can fail, as long as they are given a valid
* database pointer. */
assert(db != NULL);
int rc = sqlite3_trace_v2(db, SQLITE_TRACE_STMT, 0, 0);
assert(rc == SQLITE_OK), (void)rc;
sqlite3_progress_handler(db, 0, 0, (void *)0);
rc = sqlite3_set_authorizer(db, NULL, NULL);
assert(rc == SQLITE_OK), (void)rc;
}
static int
connection_close(pysqlite_Connection *self)
{
if (self->db == NULL) {
return 0;
}
int rc = 0;
if (self->autocommit == AUTOCOMMIT_DISABLED &&
!sqlite3_get_autocommit(self->db))
{
if (connection_exec_stmt(self, "ROLLBACK") < 0) {
rc = -1;
}
}
sqlite3 *db = self->db;
self->db = NULL;
Py_BEGIN_ALLOW_THREADS
/* The v2 close call always returns SQLITE_OK if given a valid database
* pointer (which we do), so we can safely ignore the return value */
(void)sqlite3_close_v2(db);
Py_END_ALLOW_THREADS
free_callback_contexts(self);
return rc;
}
static void
connection_finalize(PyObject *self)
{
pysqlite_Connection *con = (pysqlite_Connection *)self;
PyObject *exc = PyErr_GetRaisedException();
/* If close is implicitly called as a result of interpreter
* tear-down, we must not call back into Python. */
PyInterpreterState *interp = PyInterpreterState_Get();
int teardown = _Py_IsInterpreterFinalizing(interp);
if (teardown && con->db) {
remove_callbacks(con->db);
}
/* Clean up if user has not called .close() explicitly. */
if (con->db) {
if (PyErr_ResourceWarning(self, 1, "unclosed database in %R", self)) {
/* Spurious errors can appear at shutdown */
if (PyErr_ExceptionMatches(PyExc_Warning)) {
PyErr_FormatUnraisable("Exception ignored while finalizing "
"database connection %R", self);
}
}
}
if (connection_close(con) < 0) {
if (teardown) {
PyErr_Clear();
}
else {
PyErr_FormatUnraisable("Exception ignored while closing database %R",
self);
}
}
PyErr_SetRaisedException(exc);
}
static void
connection_dealloc(PyObject *self)
{
if (PyObject_CallFinalizerFromDealloc(self) < 0) {
return;
}
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
(void)tp->tp_clear(self);
tp->tp_free(self);
Py_DECREF(tp);
}
/*[clinic input]
_sqlite3.Connection.cursor as pysqlite_connection_cursor
factory: object = NULL
Return a cursor for the connection.
[clinic start generated code]*/
static PyObject *
pysqlite_connection_cursor_impl(pysqlite_Connection *self, PyObject *factory)
/*[clinic end generated code: output=562432a9e6af2aa1 input=4127345aa091b650]*/
{
PyObject* cursor;
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (factory == NULL) {
factory = (PyObject *)self->state->CursorType;
}
cursor = PyObject_CallOneArg(factory, (PyObject *)self);
if (cursor == NULL)
return NULL;
if (!PyObject_TypeCheck(cursor, self->state->CursorType)) {
PyErr_Format(PyExc_TypeError,
"factory must return a cursor, not %.100s",
Py_TYPE(cursor)->tp_name);
Py_DECREF(cursor);
return NULL;
}
if (cursor && self->row_factory != Py_None) {
Py_INCREF(self->row_factory);
Py_XSETREF(((pysqlite_Cursor *)cursor)->row_factory, self->row_factory);
}
return cursor;
}
/*[clinic input]
_sqlite3.Connection.blobopen as blobopen
table: str
Table name.
column as col: str
Column name.
rowid as row: sqlite3_int64
Row id.
/
*
readonly: bool = False
Open the BLOB without write permissions.
name: str = "main"
Database name.
Open and return a BLOB object.
[clinic start generated code]*/
static PyObject *
blobopen_impl(pysqlite_Connection *self, const char *table, const char *col,
sqlite3_int64 row, int readonly, const char *name)
/*[clinic end generated code: output=6a02d43efb885d1c input=cc3d4b47dac08401]*/
{
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
int rc;
sqlite3_blob *blob;
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_blob_open(self->db, name, table, col, row, !readonly, &blob);
Py_END_ALLOW_THREADS
if (rc == SQLITE_MISUSE) {
set_error_from_code(self->state, rc);
return NULL;
}
else if (rc != SQLITE_OK) {
set_error_from_db(self->state, self->db);
return NULL;
}
pysqlite_Blob *obj = PyObject_GC_New(pysqlite_Blob, self->state->BlobType);
if (obj == NULL) {
goto error;
}
obj->connection = (pysqlite_Connection *)Py_NewRef(self);
obj->blob = blob;
obj->offset = 0;
obj->in_weakreflist = NULL;
PyObject_GC_Track(obj);
// Add our blob to connection blobs list
PyObject *weakref = PyWeakref_NewRef((PyObject *)obj, NULL);
if (weakref == NULL) {
goto error;
}
rc = PyList_Append(self->blobs, weakref);
Py_DECREF(weakref);
if (rc < 0) {
goto error;
}
return (PyObject *)obj;
error:
Py_XDECREF(obj);
return NULL;
}
/*[clinic input]
_sqlite3.Connection.close as pysqlite_connection_close
Close the database connection.
Any pending transaction is not committed implicitly.
[clinic start generated code]*/
static PyObject *
pysqlite_connection_close_impl(pysqlite_Connection *self)
/*[clinic end generated code: output=a546a0da212c9b97 input=b3ed5b74f6fefc06]*/
{
if (!pysqlite_check_thread(self)) {
return NULL;
}
if (!self->initialized) {
PyTypeObject *tp = Py_TYPE(self);
pysqlite_state *state = pysqlite_get_state_by_type(tp);
PyErr_SetString(state->ProgrammingError,
"Base Connection.__init__ not called.");
return NULL;
}
pysqlite_close_all_blobs(self);
Py_CLEAR(self->statement_cache);
if (connection_close(self) < 0) {
return NULL;
}
Py_RETURN_NONE;
}
/*
* Checks if a connection object is usable (i. e. not closed).
*
* 0 => error; 1 => ok
*/
int pysqlite_check_connection(pysqlite_Connection* con)
{
if (!con->initialized) {
pysqlite_state *state = pysqlite_get_state_by_type(Py_TYPE(con));
PyErr_SetString(state->ProgrammingError,
"Base Connection.__init__ not called.");
return 0;
}
if (!con->db) {
PyErr_SetString(con->state->ProgrammingError,
"Cannot operate on a closed database.");
return 0;
} else {
return 1;
}
}
/*[clinic input]
_sqlite3.Connection.commit as pysqlite_connection_commit
Commit any pending transaction to the database.
If there is no open transaction, this method is a no-op.
[clinic start generated code]*/
static PyObject *
pysqlite_connection_commit_impl(pysqlite_Connection *self)
/*[clinic end generated code: output=3da45579e89407f2 input=c8793c97c3446065]*/
{
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (self->autocommit == AUTOCOMMIT_LEGACY) {
if (!sqlite3_get_autocommit(self->db)) {
if (connection_exec_stmt(self, "COMMIT") < 0) {
return NULL;
}
}
}
else if (self->autocommit == AUTOCOMMIT_DISABLED) {
if (connection_exec_stmt(self, "COMMIT") < 0) {
return NULL;
}
if (connection_exec_stmt(self, "BEGIN") < 0) {
return NULL;
}
}
Py_RETURN_NONE;
}
/*[clinic input]
_sqlite3.Connection.rollback as pysqlite_connection_rollback
Roll back to the start of any pending transaction.
If there is no open transaction, this method is a no-op.
[clinic start generated code]*/
static PyObject *
pysqlite_connection_rollback_impl(pysqlite_Connection *self)
/*[clinic end generated code: output=b66fa0d43e7ef305 input=7f60a2f1076f16b3]*/
{
if (!pysqlite_check_thread(self) || !pysqlite_check_connection(self)) {
return NULL;
}
if (self->autocommit == AUTOCOMMIT_LEGACY) {
if (!sqlite3_get_autocommit(self->db)) {
if (connection_exec_stmt(self, "ROLLBACK") < 0) {
return NULL;
}
}
}
else if (self->autocommit == AUTOCOMMIT_DISABLED) {
if (connection_exec_stmt(self, "ROLLBACK") < 0) {
return NULL;
}
if (connection_exec_stmt(self, "BEGIN") < 0) {
return NULL;
}
}
Py_RETURN_NONE;
}
static int
_pysqlite_set_result(sqlite3_context* context, PyObject* py_val)
{
if (py_val == Py_None) {
sqlite3_result_null(context);
} else if (PyLong_Check(py_val)) {
sqlite_int64 value = _pysqlite_long_as_int64(py_val);
if (value == -1 && PyErr_Occurred())
return -1;
sqlite3_result_int64(context, value);
} else if (PyFloat_Check(py_val)) {
double value = PyFloat_AsDouble(py_val);
if (value == -1 && PyErr_Occurred()) {
return -1;
}
sqlite3_result_double(context, value);
} else if (PyUnicode_Check(py_val)) {
Py_ssize_t sz;
const char *str = PyUnicode_AsUTF8AndSize(py_val, &sz);
if (str == NULL) {
return -1;
}
if (sz > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"string is longer than INT_MAX bytes");
return -1;
}
sqlite3_result_text(context, str, (int)sz, SQLITE_TRANSIENT);
} else if (PyObject_CheckBuffer(py_val)) {
Py_buffer view;
if (PyObject_GetBuffer(py_val, &view, PyBUF_SIMPLE) != 0) {
return -1;
}
if (view.len > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"BLOB longer than INT_MAX bytes");
PyBuffer_Release(&view);
return -1;
}
sqlite3_result_blob(context, view.buf, (int)view.len, SQLITE_TRANSIENT);
PyBuffer_Release(&view);
} else {
callback_context *ctx = (callback_context *)sqlite3_user_data(context);
PyErr_Format(ctx->state->ProgrammingError,
"User-defined functions cannot return '%s' values to "
"SQLite",
Py_TYPE(py_val)->tp_name);
return -1;
}
return 0;
}
static PyObject *
_pysqlite_build_py_params(sqlite3_context *context, int argc,
sqlite3_value **argv)
{
PyObject* args;
int i;
sqlite3_value* cur_value;
PyObject* cur_py_value;
args = PyTuple_New(argc);
if (!args) {
return NULL;
}
for (i = 0; i < argc; i++) {
cur_value = argv[i];
switch (sqlite3_value_type(argv[i])) {
case SQLITE_INTEGER:
cur_py_value = PyLong_FromLongLong(sqlite3_value_int64(cur_value));
break;
case SQLITE_FLOAT:
cur_py_value = PyFloat_FromDouble(sqlite3_value_double(cur_value));
break;
case SQLITE_TEXT: {
sqlite3 *db = sqlite3_context_db_handle(context);
const char *text = (const char *)sqlite3_value_text(cur_value);
if (text == NULL && sqlite3_errcode(db) == SQLITE_NOMEM) {
PyErr_NoMemory();
goto error;
}
Py_ssize_t size = sqlite3_value_bytes(cur_value);
cur_py_value = PyUnicode_FromStringAndSize(text, size);
break;
}
case SQLITE_BLOB: {
sqlite3 *db = sqlite3_context_db_handle(context);
const void *blob = sqlite3_value_blob(cur_value);
if (blob == NULL && sqlite3_errcode(db) == SQLITE_NOMEM) {
PyErr_NoMemory();
goto error;
}
Py_ssize_t size = sqlite3_value_bytes(cur_value);
cur_py_value = PyBytes_FromStringAndSize(blob, size);
break;
}
case SQLITE_NULL:
default:
cur_py_value = Py_NewRef(Py_None);
}
if (!cur_py_value) {
goto error;
}
PyTuple_SET_ITEM(args, i, cur_py_value);
}
return args;
error:
Py_DECREF(args);
return NULL;
}
static void
print_or_clear_traceback(callback_context *ctx)
{
assert(ctx != NULL);
assert(ctx->state != NULL);
if (ctx->state->enable_callback_tracebacks) {
PyErr_FormatUnraisable("Exception ignored on sqlite3 callback %R",
ctx->callable);
}
else {
PyErr_Clear();
}
}
// Checks the Python exception and sets the appropriate SQLite error code.
static void
set_sqlite_error(sqlite3_context *context, const char *msg)
{
assert(PyErr_Occurred());
if (PyErr_ExceptionMatches(PyExc_MemoryError)) {
sqlite3_result_error_nomem(context);
}
else if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
sqlite3_result_error_toobig(context);
}
else {
sqlite3_result_error(context, msg, -1);
}
callback_context *ctx = (callback_context *)sqlite3_user_data(context);
print_or_clear_traceback(ctx);
}
static void
func_callback(sqlite3_context *context, int argc, sqlite3_value **argv)
{
PyGILState_STATE threadstate = PyGILState_Ensure();
PyObject* args;
PyObject* py_retval = NULL;
int ok;
args = _pysqlite_build_py_params(context, argc, argv);
if (args) {
callback_context *ctx = (callback_context *)sqlite3_user_data(context);
incref_callback_context(ctx);
py_retval = PyObject_CallObject(ctx->callable, args);
decref_callback_context(ctx);
Py_DECREF(args);
}
ok = 0;
if (py_retval) {
ok = _pysqlite_set_result(context, py_retval) == 0;
Py_DECREF(py_retval);
}
if (!ok) {
set_sqlite_error(context, "user-defined function raised exception");
}
PyGILState_Release(threadstate);
}
static void
step_callback(sqlite3_context *context, int argc, sqlite3_value **params)
{
PyGILState_STATE threadstate = PyGILState_Ensure();
PyObject* args;
PyObject* function_result = NULL;
PyObject** aggregate_instance;
PyObject* stepmethod = NULL;
callback_context *ctx = (callback_context *)sqlite3_user_data(context);
incref_callback_context(ctx);
aggregate_instance = (PyObject**)sqlite3_aggregate_context(context, sizeof(PyObject*));
if (aggregate_instance == NULL) {
(void)PyErr_NoMemory();
set_sqlite_error(context, "unable to allocate SQLite aggregate context");
goto error;
}
if (*aggregate_instance == NULL) {
*aggregate_instance = PyObject_CallNoArgs(ctx->callable);
if (!*aggregate_instance) {
set_sqlite_error(context,
"user-defined aggregate's '__init__' method raised error");
goto error;
}
}
stepmethod = PyObject_GetAttr(*aggregate_instance, ctx->state->str_step);
if (!stepmethod) {
set_sqlite_error(context,
"user-defined aggregate's 'step' method not defined");
goto error;
}
args = _pysqlite_build_py_params(context, argc, params);
if (!args) {
goto error;
}
function_result = PyObject_CallObject(stepmethod, args);
Py_DECREF(args);
if (!function_result) {
set_sqlite_error(context,
"user-defined aggregate's 'step' method raised error");
}
error:
decref_callback_context(ctx);
Py_XDECREF(stepmethod);
Py_XDECREF(function_result);
PyGILState_Release(threadstate);
}
static void
final_callback(sqlite3_context *context)
{
PyGILState_STATE threadstate = PyGILState_Ensure();