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from select import select
import pytest
import psycopg
from psycopg import pq
from psycopg.generators import execute
def execute_wait(pgconn):
return psycopg.waiting.wait(execute(pgconn), pgconn.socket)
def test_send_query(pgconn):
# This test shows how to process an async query in all its glory
pgconn.nonblocking = 1
# Long query to make sure we have to wait on send
pgconn.send_query(
b"/* %s */ select 'x' as f from pg_sleep(0.01); select 1 as foo;"
% (b"x" * 1_000_000)
)
# send loop
waited_on_send = 0
while True:
f = pgconn.flush()
if f == 0:
break
waited_on_send += 1
rl, wl, xl = select([pgconn.socket], [pgconn.socket], [])
assert not (rl and wl)
if wl:
continue # call flush again()
if rl:
pgconn.consume_input()
continue
# TODO: this check is not reliable, it fails on travis sometimes
# assert waited_on_send
# read loop
results = []
while True:
pgconn.consume_input()
if pgconn.is_busy():
select([pgconn.socket], [], [])
continue
res = pgconn.get_result()
if res is None:
break
assert res.status == pq.ExecStatus.TUPLES_OK
results.append(res)
assert len(results) == 2
assert results[0].nfields == 1
assert results[0].fname(0) == b"f"
assert results[0].get_value(0, 0) == b"x"
assert results[1].nfields == 1
assert results[1].fname(0) == b"foo"
assert results[1].get_value(0, 0) == b"1"
def test_send_query_compact_test(pgconn):
# Like the above test but use psycopg facilities for compactness
pgconn.send_query(
b"/* %s */ select 'x' as f from pg_sleep(0.01); select 1 as foo;"
% (b"x" * 1_000_000)
)
results = execute_wait(pgconn)
assert len(results) == 2
assert results[0].nfields == 1
assert results[0].fname(0) == b"f"
assert results[0].get_value(0, 0) == b"x"
assert results[1].nfields == 1
assert results[1].fname(0) == b"foo"
assert results[1].get_value(0, 0) == b"1"
pgconn.finish()
with pytest.raises(psycopg.OperationalError):
pgconn.send_query(b"select 1")
def test_single_row_mode(pgconn):
pgconn.send_query(b"select generate_series(1,2)")
pgconn.set_single_row_mode()
results = execute_wait(pgconn)
assert len(results) == 3
res = results[0]
assert res.status == pq.ExecStatus.SINGLE_TUPLE
assert res.ntuples == 1
assert res.get_value(0, 0) == b"1"
res = results[1]
assert res.status == pq.ExecStatus.SINGLE_TUPLE
assert res.ntuples == 1
assert res.get_value(0, 0) == b"2"
res = results[2]
assert res.status == pq.ExecStatus.TUPLES_OK
assert res.ntuples == 0
def test_send_query_params(pgconn):
pgconn.send_query_params(b"select $1::int + $2", [b"5", b"3"])
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.TUPLES_OK
assert res.get_value(0, 0) == b"8"
pgconn.finish()
with pytest.raises(psycopg.OperationalError):
pgconn.send_query_params(b"select $1", [b"1"])
def test_send_prepare(pgconn):
pgconn.send_prepare(b"prep", b"select $1::int + $2::int")
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
pgconn.send_query_prepared(b"prep", [b"3", b"5"])
(res,) = execute_wait(pgconn)
assert res.get_value(0, 0) == b"8"
pgconn.finish()
with pytest.raises(psycopg.OperationalError):
pgconn.send_prepare(b"prep", b"select $1::int + $2::int")
with pytest.raises(psycopg.OperationalError):
pgconn.send_query_prepared(b"prep", [b"3", b"5"])
def test_send_prepare_types(pgconn):
pgconn.send_prepare(b"prep", b"select $1 + $2", [23, 23])
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
pgconn.send_query_prepared(b"prep", [b"3", b"5"])
(res,) = execute_wait(pgconn)
assert res.get_value(0, 0) == b"8"
def test_send_prepared_binary_in(pgconn):
val = b"foo\00bar"
pgconn.send_prepare(b"", b"select length($1::bytea), length($2::bytea)")
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
pgconn.send_query_prepared(b"", [val, val], param_formats=[0, 1])
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.TUPLES_OK
assert res.get_value(0, 0) == b"3"
assert res.get_value(0, 1) == b"7"
with pytest.raises(ValueError):
pgconn.exec_params(b"select $1::bytea", [val], param_formats=[1, 1])
@pytest.mark.parametrize("fmt, out", [(0, b"\\x666f6f00626172"), (1, b"foo\00bar")])
def test_send_prepared_binary_out(pgconn, fmt, out):
val = b"foo\00bar"
pgconn.send_prepare(b"", b"select $1::bytea")
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
pgconn.send_query_prepared(b"", [val], param_formats=[1], result_format=fmt)
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.TUPLES_OK
assert res.get_value(0, 0) == out
def test_send_describe_prepared(pgconn):
pgconn.send_prepare(b"prep", b"select $1::int8 + $2::int8 as fld")
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
pgconn.send_describe_prepared(b"prep")
(res,) = execute_wait(pgconn)
assert res.nfields == 1
assert res.ntuples == 0
assert res.fname(0) == b"fld"
assert res.ftype(0) == 20
pgconn.finish()
with pytest.raises(psycopg.OperationalError):
pgconn.send_describe_prepared(b"prep")
@pytest.mark.crdb_skip("server-side cursor")
def test_send_describe_portal(pgconn):
res = pgconn.exec_(
b"""
begin;
declare cur cursor for select * from generate_series(1,10) foo;
"""
)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
pgconn.send_describe_portal(b"cur")
(res,) = execute_wait(pgconn)
assert res.status == pq.ExecStatus.COMMAND_OK, res.error_message
assert res.nfields == 1
assert res.fname(0) == b"foo"
pgconn.finish()
with pytest.raises(psycopg.OperationalError):
pgconn.send_describe_portal(b"cur")
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