def poll(self):
if self.status == consts.STATUS_SETUP:
self.status = consts.STATUS_CONNECTING
return consts.POLL_WRITE
if self.status == consts.STATUS_CONNECTING:
res = self._poll_connecting()
if res == consts.POLL_OK and self._async:
return self._poll_setup_async()
return res
if self.status in (consts.STATUS_READY, consts.STATUS_BEGIN,
consts.STATUS_PREPARED):
res = self._poll_query()
if res == consts.POLL_OK and self._async and self._async_cursor:
# Get the cursor object from the weakref
curs = self._async_cursor()
if curs is None:
util.pq_clear_async(self._pgconn)
raise exceptions.InterfaceError(
"the asynchronous cursor has disappeared")
libpq.PQclear(curs._pgres)
curs._pgres = util.pq_get_last_result(self._pgconn)
try:
curs._pq_fetch()
finally:
self._async_cursor = None
return res
return consts.POLL_ERROR
def _execute_green(self, query):
"""Execute version for green threads"""
if self._async_cursor:
raise exceptions.ProgrammingError(
"a single async query can be executed on the same connection")
self._async_cursor = True
if not libpq.PQsendQuery(self._pgconn, query):
self._async_cursor = None
return
self._async_status = consts.ASYNC_WRITE
try:
_green_callback(self)
return util.pq_get_last_result(self._pgconn)
except:
util.pq_clear_async(self._pgconn)
raise
finally:
self._async_cursor = None
self._async_status = consts.ASYNC_DONE
def _pq_fetch_copy_out(self):
is_text = isinstance(self._copyfile, TextIOBase)
pgconn = self._conn._pgconn
while True:
buf = libpq.pointer(libpq.c_char_p())
length = libpq.PQgetCopyData(pgconn, buf, 0)
if length > 0:
value = buf.contents.value
if is_text:
value = typecasts.parse_unicode(value, length, self)
libpq.PQfreemem(buf.contents)
if value is None:
return
self._copyfile.write(value)
elif length == -2:
raise self._conn._create_exception()
else:
break
self._clear_pgres()
util.pq_clear_async(pgconn)
def _pq_fetch_copy_in(self):
pgconn = self._conn._pgconn
size = self._copysize
error = 0
while True:
data = self._copyfile.read(size)
if isinstance(self._copyfile, TextIOBase):
data = data.encode(self._conn._py_enc)
if not data:
break
res = libpq.PQputCopyData(pgconn, data, len(data))
if res <= 0:
error = 2
break
errmsg = None
if error == 2:
errmsg = 'error in PQputCopyData() call'
libpq.PQputCopyEnd(pgconn, errmsg)
self._clear_pgres()
util.pq_clear_async(pgconn)
def _pq_fetch_copy_out(self):
is_text = isinstance(self._copyfile, TextIOBase)
pgconn = self._conn._pgconn
while True:
buf = libpq.pointer(libpq.c_char_p())
length = libpq.PQgetCopyData(pgconn, buf, 0)
if length > 0:
value = buf.contents.value
if is_text:
value = typecasts.parse_unicode(value, length, self)
libpq.PQfreemem(buf.contents)
if value is None:
return
self._copyfile.write(value)
elif length == -2:
raise self._conn._create_exception()
else:
break
self._clear_pgres()
util.pq_clear_async(pgconn)
def _pq_fetch_copy_in(self):
pgconn = self._conn._pgconn
size = self._copysize
error = 0
while True:
data = self._copyfile.read(size)
if isinstance(self._copyfile, TextIOBase):
data = data.encode(self._conn._py_enc)
if not data:
break
res = libpq.PQputCopyData(pgconn, data, len(data))
if res <= 0:
error = 2
break
errmsg = None
if error == 2:
errmsg = 'error in PQputCopyData() call'
libpq.PQputCopyEnd(pgconn, errmsg)
self._clear_pgres()
util.pq_clear_async(pgconn)
