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#!/usr/bin/env python
import os
import shutil
import tempfile
import unittest
import warnings
import psycopg2
import psycopg2.extensions
import tests
class LargeObjectTests(unittest.TestCase):
def setUp(self):
self.conn = psycopg2.connect(tests.dsn)
self.lo_oid = None
self.tmpdir = None
def tearDown(self):
if self.tmpdir:
shutil.rmtree(self.tmpdir, ignore_errors=True)
if self.lo_oid is not None:
self.conn.rollback()
try:
lo = self.conn.lobject(self.lo_oid, "n")
except psycopg2.OperationalError:
pass
else:
lo.unlink()
self.conn.close()
def test_create(self):
lo = self.conn.lobject()
self.assertNotEqual(lo, None)
self.assertEqual(lo.mode, "w")
def test_open_non_existent(self):
# By creating then removing a large object, we get an Oid that
# should be unused.
lo = self.conn.lobject()
lo.unlink()
self.assertRaises(psycopg2.OperationalError, self.conn.lobject, lo.oid)
def test_open_existing(self):
lo = self.conn.lobject()
lo2 = self.conn.lobject(lo.oid)
self.assertNotEqual(lo2, None)
self.assertEqual(lo2.oid, lo.oid)
self.assertEqual(lo2.mode, "r")
def test_open_for_write(self):
lo = self.conn.lobject()
lo2 = self.conn.lobject(lo.oid, "w")
self.assertEqual(lo2.mode, "w")
lo2.write("some data")
def test_open_mode_n(self):
# Openning an object in mode "n" gives us a closed lobject.
lo = self.conn.lobject()
lo.close()
lo2 = self.conn.lobject(lo.oid, "n")
self.assertEqual(lo2.oid, lo.oid)
self.assertEqual(lo2.closed, True)
def test_create_with_oid(self):
# Create and delete a large object to get an unused Oid.
lo = self.conn.lobject()
oid = lo.oid
lo.unlink()
lo = self.conn.lobject(0, "w", oid)
self.assertEqual(lo.oid, oid)
def test_create_with_existing_oid(self):
lo = self.conn.lobject()
lo.close()
self.assertRaises(psycopg2.OperationalError,
self.conn.lobject, 0, "w", lo.oid)
def test_import(self):
self.tmpdir = tempfile.mkdtemp()
filename = os.path.join(self.tmpdir, "data.txt")
fp = open(filename, "wb")
fp.write("some data")
fp.close()
lo = self.conn.lobject(0, "r", 0, filename)
self.assertEqual(lo.read(), "some data")
def test_close(self):
lo = self.conn.lobject()
self.assertEqual(lo.closed, False)
lo.close()
self.assertEqual(lo.closed, True)
def test_write(self):
lo = self.conn.lobject()
self.assertEqual(lo.write("some data"), len("some data"))
def test_write_large(self):
lo = self.conn.lobject()
data = "data" * 1000000
self.assertEqual(lo.write(data), len(data))
def test_read(self):
lo = self.conn.lobject()
length = lo.write("some data")
lo.close()
lo = self.conn.lobject(lo.oid)
self.assertEqual(lo.read(4), "some")
self.assertEqual(lo.read(), " data")
def test_read_large(self):
lo = self.conn.lobject()
data = "data" * 1000000
length = lo.write("some"+data)
lo.close()
lo = self.conn.lobject(lo.oid)
self.assertEqual(lo.read(4), "some")
self.assertEqual(lo.read(), data)
def test_seek_tell(self):
lo = self.conn.lobject()
length = lo.write("some data")
self.assertEqual(lo.tell(), length)
lo.close()
lo = self.conn.lobject(lo.oid)
self.assertEqual(lo.seek(5, 0), 5)
self.assertEqual(lo.tell(), 5)
self.assertEqual(lo.read(), "data")
# SEEK_CUR: relative current location
lo.seek(5)
self.assertEqual(lo.seek(2, 1), 7)
self.assertEqual(lo.tell(), 7)
self.assertEqual(lo.read(), "ta")
# SEEK_END: relative to end of file
self.assertEqual(lo.seek(-2, 2), length - 2)
self.assertEqual(lo.read(), "ta")
def test_unlink(self):
lo = self.conn.lobject()
lo.unlink()
# the object doesn't exist now, so we can't reopen it.
self.assertRaises(psycopg2.OperationalError, self.conn.lobject, lo.oid)
# And the object has been closed.
self.assertEquals(lo.closed, True)
def test_export(self):
lo = self.conn.lobject()
lo.write("some data")
self.tmpdir = tempfile.mkdtemp()
filename = os.path.join(self.tmpdir, "data.txt")
lo.export(filename)
self.assertTrue(os.path.exists(filename))
self.assertEqual(open(filename, "rb").read(), "some data")
def test_close_twice(self):
lo = self.conn.lobject()
lo.close()
lo.close()
def test_write_after_close(self):
lo = self.conn.lobject()
lo.close()
self.assertRaises(psycopg2.InterfaceError, lo.write, "some data")
def test_read_after_close(self):
lo = self.conn.lobject()
lo.close()
self.assertRaises(psycopg2.InterfaceError, lo.read, 5)
def test_seek_after_close(self):
lo = self.conn.lobject()
lo.close()
self.assertRaises(psycopg2.InterfaceError, lo.seek, 0)
def test_tell_after_close(self):
lo = self.conn.lobject()
lo.close()
self.assertRaises(psycopg2.InterfaceError, lo.tell)
def test_unlink_after_close(self):
lo = self.conn.lobject()
lo.close()
# Unlink works on closed files.
lo.unlink()
def test_export_after_close(self):
lo = self.conn.lobject()
lo.write("some data")
lo.close()
self.tmpdir = tempfile.mkdtemp()
filename = os.path.join(self.tmpdir, "data.txt")
lo.export(filename)
self.assertTrue(os.path.exists(filename))
self.assertEqual(open(filename, "rb").read(), "some data")
def test_close_after_commit(self):
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
# Closing outside of the transaction is okay.
lo.close()
def test_write_after_commit(self):
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
self.assertRaises(psycopg2.ProgrammingError, lo.write, "some data")
def test_read_after_commit(self):
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
self.assertRaises(psycopg2.ProgrammingError, lo.read, 5)
def test_seek_after_commit(self):
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
self.assertRaises(psycopg2.ProgrammingError, lo.seek, 0)
def test_tell_after_commit(self):
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
self.assertRaises(psycopg2.ProgrammingError, lo.tell)
def test_unlink_after_commit(self):
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
# Unlink of stale lobject is okay
lo.unlink()
def test_export_after_commit(self):
lo = self.conn.lobject()
lo.write("some data")
self.conn.commit()
self.tmpdir = tempfile.mkdtemp()
filename = os.path.join(self.tmpdir, "data.txt")
lo.export(filename)
self.assertTrue(os.path.exists(filename))
self.assertEqual(open(filename, "rb").read(), "some data")
class LargeObjectTruncateTests(LargeObjectTests):
skip = None
def setUp(self):
LargeObjectTests.setUp(self)
if self.skip is None:
self.skip = False
if self.conn.server_version < 80300:
warnings.warn("Large object truncate tests skipped, "
"the server does not support them")
self.skip = True
if not hasattr(psycopg2.extensions.lobject, 'truncate'):
warnings.warn("Large object truncate tests skipped, "
"psycopg2 has been built against an old library")
self.skip = True
def test_truncate(self):
if self.skip:
return
lo = self.conn.lobject()
lo.write("some data")
lo.close()
lo = self.conn.lobject(lo.oid, "w")
lo.truncate(4)
# seek position unchanged
self.assertEqual(lo.tell(), 0)
# data truncated
self.assertEqual(lo.read(), "some")
lo.truncate(6)
lo.seek(0)
# large object extended with zeroes
self.assertEqual(lo.read(), "some\x00\x00")
lo.truncate()
lo.seek(0)
# large object empty
self.assertEqual(lo.read(), "")
def test_truncate_after_close(self):
if self.skip:
return
lo = self.conn.lobject()
lo.close()
self.assertRaises(psycopg2.InterfaceError, lo.truncate)
def test_truncate_after_commit(self):
if self.skip:
return
lo = self.conn.lobject()
self.lo_oid = lo.oid
self.conn.commit()
self.assertRaises(psycopg2.ProgrammingError, lo.truncate)
def test_suite():
return unittest.TestLoader().loadTestsFromName(__name__)
if __name__ == "__main__":
unittest.main()
|
