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Retrieving the async cursor moved out of conn_poll() body

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This commit is contained in:
Daniele Varrazzo 2019-03-08 00:03:11 +00:00
parent e864050d07
commit 761c3784c4
1 changed files with 39 additions and 18 deletions
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57
psycopg/connection_int.c
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@ -1042,6 +1042,35 @@ _conn_poll_setup_async(connectionObject *self)
}
static cursorObject *
_conn_get_async_cursor(connectionObject *self) {
PyObject *py_curs;
if (!(self->async_cursor)) {
PyErr_SetString(PyExc_SystemError,
"unexpectedly, there's no async cursor here");
goto error;
}
if (!(py_curs = PyWeakref_GetObject(self->async_cursor))) {
PyErr_SetString(PyExc_SystemError,
"got null dereferencing cursor weakref");
goto error;
}
if (Py_None == py_curs) {
PyErr_SetString(InterfaceError,
"the asynchronous cursor has disappeared");
goto error;
}
Py_INCREF(py_curs);
return (cursorObject *)py_curs;
error:
pq_clear_async(self);
return NULL;
}
/* conn_poll - Main polling switch
*
* The function is called in all the states and connection types and invokes
@ -1056,12 +1085,13 @@ conn_poll(connectionObject *self)
switch (self->status) {
case CONN_STATUS_SETUP:
Dprintf("conn_poll: status -> CONN_STATUS_CONNECTING");
Dprintf("conn_poll: status -> CONN_STATUS_SETUP");
self->status = CONN_STATUS_CONNECTING;
res = PSYCO_POLL_WRITE;
break;
case CONN_STATUS_CONNECTING:
Dprintf("conn_poll: status -> CONN_STATUS_CONNECTING");
res = _conn_poll_connecting(self);
if (res == PSYCO_POLL_OK && self->async) {
res = _conn_poll_setup_async(self);
@ -1069,37 +1099,26 @@ conn_poll(connectionObject *self)
break;
case CONN_STATUS_DATESTYLE:
Dprintf("conn_poll: status -> CONN_STATUS_DATESTYLE");
res = _conn_poll_setup_async(self);
break;
case CONN_STATUS_READY:
case CONN_STATUS_BEGIN:
case CONN_STATUS_PREPARED:
Dprintf("conn_poll: status -> CONN_STATUS_*");
res = _conn_poll_query(self);
if (res == PSYCO_POLL_OK && self->async && self->async_cursor) {
if (res == PSYCO_POLL_OK && self->async) {
cursorObject *curs;
/* An async query has just finished: parse the tuple in the
* target cursor. */
cursorObject *curs;
PyObject *py_curs;
if (!(py_curs = PyWeakref_GetObject(self->async_cursor))) {
/* It shouldn't happen but consider it to avoid dereferencing
* a null pointer below. */
pq_clear_async(self);
PyErr_SetString(PyExc_SystemError,
"got null dereferencing cursor weakref");
res = PSYCO_POLL_ERROR;
break;
}
if (Py_None == py_curs) {
pq_clear_async(self);
PyErr_SetString(InterfaceError,
"the asynchronous cursor has disappeared");
if (!(curs = _conn_get_async_cursor(self))) {
res = PSYCO_POLL_ERROR;
break;
}
curs = (cursorObject *)py_curs;
CLEARPGRES(curs->pgres);
curs->pgres = pq_get_last_result(self);
@ -1111,6 +1130,7 @@ conn_poll(connectionObject *self)
}
/* We have finished with our async_cursor */
Py_DECREF(curs);
Py_CLEAR(self->async_cursor);
}
break;
@ -1120,6 +1140,7 @@ conn_poll(connectionObject *self)
res = PSYCO_POLL_ERROR;
}
Dprintf("conn_poll: returning %d", res);
return res;
}