--- /dev/null
+/* connection_int.c - code used by the connection object
+ *
+ * Copyright (C) 2003 Federico Di Gregorio <fog@debian.org>
+ *
+ * This file is part of psycopg.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <Python.h>
+#include <string.h>
+
+#define PSYCOPG_MODULE
+#include "psycopg/config.h"
+#include "psycopg/psycopg.h"
+#include "psycopg/connection.h"
+#include "psycopg/cursor.h"
+#include "psycopg/pqpath.h"
+
+/* conn_notice_callback - process notices */
+
+void
+conn_notice_callback(void *args, const char *message)
+{
+ connectionObject *self = (connectionObject *)args;
+
+ Dprintf("conn_notice_callback: %s", message);
+
+ /* unfortunately the old protocl return COPY FROM errors only as notices,
+ so we need to filter them looking for such errors */
+ if (strncmp(message, "ERROR", 5) == 0)
+ pq_set_critical(self, message);
+ else
+ PyList_Append(self->notice_list, PyString_FromString(message));
+}
+
+/* conn_connect - execute a connection to the dataabase */
+
+int
+conn_connect(connectionObject *self)
+{
+ PGconn *pgconn;
+ PGresult *pgres;
+ char *data, *tmp;
+ int i;
+
+ /* we need the initial date style to be ISO, for typecasters; if the user
+ later change it, she must know what she's doing... */
+ const char *datestyle = "SET DATESTYLE TO 'ISO'";
+ const char *encoding = "SHOW client_encoding";
+ const char *isolevel = "SHOW default_transaction_isolation";
+
+ const char *lvl1a = "read uncommitted";
+ const char *lvl1b = "read committed";
+ const char *lvl2a = "repeatable read";
+ const char *lvl2b = "serializable";
+
+ Py_BEGIN_ALLOW_THREADS;
+ pgconn = PQconnectdb(self->dsn);
+ Py_END_ALLOW_THREADS;
+
+ Dprintf("conn_connect: new postgresql connection at %p", pgconn);
+
+ if (pgconn == NULL)
+ {
+ Dprintf("conn_connect: PQconnectdb(%s) FAILED", self->dsn);
+ PyErr_SetString(OperationalError, "PQconnectdb() failed");
+ return -1;
+ }
+ else if (PQstatus(pgconn) == CONNECTION_BAD)
+ {
+ Dprintf("conn_connect: PQconnectdb(%s) returned BAD", self->dsn);
+ PyErr_SetString(OperationalError, PQerrorMessage(pgconn));
+ PQfinish(pgconn);
+ return -1;
+ }
+
+ PQsetNoticeProcessor(pgconn, conn_notice_callback, (void*)self);
+
+ Py_BEGIN_ALLOW_THREADS;
+ pgres = PQexec(pgconn, datestyle);
+ Py_END_ALLOW_THREADS;
+
+ if (pgres == NULL || PQresultStatus(pgres) != PGRES_COMMAND_OK ) {
+ PyErr_SetString(OperationalError, "can't set datestyle to ISO");
+ PQfinish(pgconn);
+ IFCLEARPGRES(pgres);
+ return -1;
+ }
+ CLEARPGRES(pgres);
+
+ Py_BEGIN_ALLOW_THREADS;
+ pgres = PQexec(pgconn, encoding);
+ Py_END_ALLOW_THREADS;
+
+ if (pgres == NULL || PQresultStatus(pgres) != PGRES_TUPLES_OK) {
+ PyErr_SetString(OperationalError, "can't fetch client_encoding");
+ PQfinish(pgconn);
+ IFCLEARPGRES(pgres);
+ return -1;
+ }
+ tmp = PQgetvalue(pgres, 0, 0);
+ self->encoding = PyMem_Malloc(strlen(tmp)+1);
+ if (self->encoding == NULL) {
+ /* exception already set by PyMem_Malloc() */
+ PQfinish(pgconn);
+ IFCLEARPGRES(pgres);
+ return -1;
+ }
+ for (i=0 ; i < strlen(tmp) ; i++)
+ self->encoding[i] = toupper(tmp[i]);
+ self->encoding[i] = '\0';
+ CLEARPGRES(pgres);
+
+ Py_BEGIN_ALLOW_THREADS;
+ pgres = PQexec(pgconn, isolevel);
+ Py_END_ALLOW_THREADS;
+
+ if (pgres == NULL || PQresultStatus(pgres) != PGRES_TUPLES_OK) {
+ PyErr_SetString(OperationalError,
+ "can't fetch default_isolation_level");
+ PQfinish(pgconn);
+ IFCLEARPGRES(pgres);
+ return -1;
+ }
+ data = PQgetvalue(pgres, 0, 0);
+ if ((strncmp(lvl1a, data, strlen(lvl1a)) == 0)
+ || (strncmp(lvl1b, data, strlen(lvl1b)) == 0))
+ self->isolation_level = 1;
+ else if ((strncmp(lvl2a, data, strlen(lvl2a)) == 0)
+ || (strncmp(lvl2b, data, strlen(lvl2b)) == 0))
+ self->isolation_level = 2;
+ else
+ self->isolation_level = 2;
+ CLEARPGRES(pgres);
+
+ if (PQsetnonblocking(pgconn, 1) != 0) {
+ Dprintf("conn_connect: PQsetnonblocking() FAILED");
+ PyErr_SetString(OperationalError, "PQsetnonblocking() failed");
+ PQfinish(pgconn);
+ return -1;
+ }
+
+#ifdef HAVE_PQPROTOCOL3
+ self->protocol = PQprotocolVersion(pgconn);
+#else
+ self->protocol = 2;
+#endif
+ Dprintf("conn_connect: using protocol %d", self->protocol);
+
+ self->pgconn = pgconn;
+ return 0;
+}
+
+/* conn_close - do anything needed to shut down the connection */
+
+void
+conn_close(connectionObject *self)
+{
+ /* sets this connection as closed even for other threads; also note that
+ we need to check the value of pgconn, because we get called even when
+ the connection fails! */
+ Py_BEGIN_ALLOW_THREADS;
+ pthread_mutex_lock(&self->lock);
+
+ self->closed = 1;
+
+ /* execute a forced rollback on the connection (but don't check the
+ result, we're going to close the pq connection anyway */
+ if (self->pgconn) {
+ pq_abort(self);
+ PQfinish(self->pgconn);
+ Dprintf("conn_close: PQfinish called");
+ self->pgconn = NULL;
+ }
+
+ pthread_mutex_unlock(&self->lock);
+ Py_END_ALLOW_THREADS;
+
+}
+
+/* conn_commit - commit on a connection */
+
+int
+conn_commit(connectionObject *self)
+{
+ int res;
+
+ Py_BEGIN_ALLOW_THREADS;
+ pthread_mutex_lock(&self->lock);
+
+ res = pq_commit(self);
+ self->mark++;
+
+ pthread_mutex_unlock(&self->lock);
+ Py_END_ALLOW_THREADS;
+
+ return res;
+}
+
+/* conn_rollback - rollback a connection */
+
+int
+conn_rollback(connectionObject *self)
+{
+ int res;
+
+ Py_BEGIN_ALLOW_THREADS;
+ pthread_mutex_lock(&self->lock);
+
+ res = pq_abort(self);
+ self->mark++;
+
+ pthread_mutex_unlock(&self->lock);
+ Py_END_ALLOW_THREADS;
+
+ return res;
+}
+
+/* conn_switch_isolation_level - switch isolation level on the connection */
+
+int
+conn_switch_isolation_level(connectionObject *self, int level)
+{
+ int res = 0;
+
+ Py_BEGIN_ALLOW_THREADS;
+ pthread_mutex_lock(&self->lock);
+
+ /* if the current isolation level is > 0 we need to abort the current
+ transaction before changing; that all folks! */
+ if (self->isolation_level != level && self->isolation_level > 0) {
+ res = pq_abort(self);
+ }
+ self->isolation_level = level;
+ self->mark++;
+
+ Dprintf("conn_switch_isolation_level: switched to level %d", level);
+
+ pthread_mutex_unlock(&self->lock);
+ Py_END_ALLOW_THREADS;
+
+ return res;
+}
+
+/* conn_set_client_encoding - switch client encoding on connection */
+
+int
+conn_set_client_encoding(connectionObject *self, char *enc)
+{
+ PGresult *pgres;
+ char query[48];
+ int res = 0;
+
+ /* TODO: check for async query here and raise error if necessary */
+
+ Py_BEGIN_ALLOW_THREADS;
+ pthread_mutex_lock(&self->lock);
+
+ /* set encoding, no encoding string is longer than 24 bytes */
+ PyOS_snprintf(query, 47, "SET client_encoding = '%s'", enc);
+
+ /* abort the current transaction, to set the encoding ouside of
+ transactions */
+ res = pq_abort(self);
+
+ if (res == 0) {
+ pgres = PQexec(self->pgconn, query);
+
+ if (pgres == NULL || PQresultStatus(pgres) != PGRES_COMMAND_OK ) {
+ res = -1;
+ }
+ else {
+ /* no error, we can proceeed and store the new encoding */
+ if (self->encoding) free(self->encoding);
+ self->encoding = strdup(enc);
+ }
+
+ IFCLEARPGRES(pgres);
+ }
+
+ Dprintf("conn_set_client_encoding: set encoding to %s", self->encoding);
+
+ pthread_mutex_unlock(&self->lock);
+ Py_END_ALLOW_THREADS;
+
+ if (res == -1)
+ PyErr_Format(OperationalError, "can't set encoding to %s", enc);
+
+ return res;
+}
git://git.onelab.eu / plcapi.git / blobdiff