# Run the _testcapi module tests (tests for the Python/C API):  by defn,
# these are all functions _testcapi exports whose name begins with 'test_'.

import os
import pickle
import random
import re
import subprocess
import sys
import sysconfig
import textwrap
import time
import unittest
from test import support
from test.support import MISSING_C_DOCSTRINGS
from test.support.script_helper import assert_python_failure, assert_python_ok
try:
    import _posixsubprocess
except ImportError:
    _posixsubprocess = None
try:
    import threading
except ImportError:
    threading = None
# Skip this test if the _testcapi module isn't available.
_testcapi = support.import_module('_testcapi')

# Were we compiled --with-pydebug or with #define Py_DEBUG?
Py_DEBUG = hasattr(sys, 'gettotalrefcount')

skips = []
if support.check_impl_detail(pypy=True):
    skips += [
        'test_lazy_hash_inheritance',
        'test_capsule',
    ]

def testfunction(self):
    """some doc"""
    return self

class InstanceMethod:
    id = _testcapi.instancemethod(id)
    testfunction = _testcapi.instancemethod(testfunction)

class CAPITest(unittest.TestCase):

    def test_instancemethod(self):
        inst = InstanceMethod()
        self.assertEqual(id(inst), inst.id())
        self.assertTrue(inst.testfunction() is inst)
        self.assertEqual(inst.testfunction.__doc__, testfunction.__doc__)
        self.assertEqual(InstanceMethod.testfunction.__doc__, testfunction.__doc__)

        InstanceMethod.testfunction.attribute = "test"
        self.assertEqual(testfunction.attribute, "test")
        self.assertRaises(AttributeError, setattr, inst.testfunction, "attribute", "test")

    @unittest.skipIf(support.check_impl_detail(pypy=True),
                    "doesn't crash on PyPy")
    @unittest.skipUnless(threading, 'Threading required for this test.')
    def test_no_FatalError_infinite_loop(self):
        with support.SuppressCrashReport():
            p = subprocess.Popen([sys.executable, "-c",
                                  'import _testcapi;'
                                  '_testcapi.crash_no_current_thread()'],
                                 stdout=subprocess.PIPE,
                                 stderr=subprocess.PIPE)
        (out, err) = p.communicate()
        self.assertEqual(out, b'')
        # This used to cause an infinite loop.
        self.assertTrue(err.rstrip().startswith(
                         b'Fatal Python error:'
                         b' PyThreadState_Get: no current thread'))

    def test_memoryview_from_NULL_pointer(self):
        self.assertRaises(ValueError, _testcapi.make_memoryview_from_NULL_pointer)

    def test_exc_info(self):
        raised_exception = ValueError("5")
        new_exc = TypeError("TEST")
        try:
            raise raised_exception
        except ValueError as e:
            tb = e.__traceback__
            orig_sys_exc_info = sys.exc_info()
            orig_exc_info = _testcapi.set_exc_info(new_exc.__class__, new_exc, None)
            new_sys_exc_info = sys.exc_info()
            new_exc_info = _testcapi.set_exc_info(*orig_exc_info)
            reset_sys_exc_info = sys.exc_info()

            self.assertEqual(orig_exc_info[1], e)

            self.assertSequenceEqual(orig_exc_info, (raised_exception.__class__, raised_exception, tb))
            self.assertSequenceEqual(orig_sys_exc_info, orig_exc_info)
            self.assertSequenceEqual(reset_sys_exc_info, orig_exc_info)
            self.assertSequenceEqual(new_exc_info, (new_exc.__class__, new_exc, None))
            self.assertSequenceEqual(new_sys_exc_info, new_exc_info)
        else:
            self.assertTrue(False)

    @unittest.skipUnless(_posixsubprocess, '_posixsubprocess required for this test.')
    def test_seq_bytes_to_charp_array(self):
        # Issue #15732: crash in _PySequence_BytesToCharpArray()
        class Z(object):
            def __len__(self):
                return 1
        self.assertRaises(TypeError, _posixsubprocess.fork_exec,
                          1,Z(),3,(1, 2),5,6,7,8,9,10,11,12,13,14,15,16,17)
        # Issue #15736: overflow in _PySequence_BytesToCharpArray()
        class Z(object):
            def __len__(self):
                return sys.maxsize
            def __getitem__(self, i):
                return b'x'
        self.assertRaises(MemoryError, _posixsubprocess.fork_exec,
                          1,Z(),3,(1, 2),5,6,7,8,9,10,11,12,13,14,15,16,17)

    @unittest.skipUnless(_posixsubprocess, '_posixsubprocess required for this test.')
    def test_subprocess_fork_exec(self):
        class Z(object):
            def __len__(self):
                return 1

        # Issue #15738: crash in subprocess_fork_exec()
        self.assertRaises(TypeError, _posixsubprocess.fork_exec,
                          Z(),[b'1'],3,(1, 2),5,6,7,8,9,10,11,12,13,14,15,16,17)

    @unittest.skipIf(MISSING_C_DOCSTRINGS,
                     "Signature information for builtins requires docstrings")
    def test_docstring_signature_parsing(self):

        self.assertEqual(_testcapi.no_docstring.__doc__, None)
        self.assertEqual(_testcapi.no_docstring.__text_signature__, None)

        self.assertEqual(_testcapi.docstring_empty.__doc__, None)
        self.assertEqual(_testcapi.docstring_empty.__text_signature__, None)

        self.assertEqual(_testcapi.docstring_no_signature.__doc__,
            "This docstring has no signature.")
        self.assertEqual(_testcapi.docstring_no_signature.__text_signature__, None)

        self.assertEqual(_testcapi.docstring_with_invalid_signature.__doc__,
            "docstring_with_invalid_signature($module, /, boo)\n"
            "\n"
            "This docstring has an invalid signature."
            )
        self.assertEqual(_testcapi.docstring_with_invalid_signature.__text_signature__, None)

        self.assertEqual(_testcapi.docstring_with_invalid_signature2.__doc__,
            "docstring_with_invalid_signature2($module, /, boo)\n"
            "\n"
            "--\n"
            "\n"
            "This docstring also has an invalid signature."
            )
        self.assertEqual(_testcapi.docstring_with_invalid_signature2.__text_signature__, None)

        self.assertEqual(_testcapi.docstring_with_signature.__doc__,
            "This docstring has a valid signature.")
        self.assertEqual(_testcapi.docstring_with_signature.__text_signature__, "($module, /, sig)")

        self.assertEqual(_testcapi.docstring_with_signature_but_no_doc.__doc__, None)
        self.assertEqual(_testcapi.docstring_with_signature_but_no_doc.__text_signature__,
            "($module, /, sig)")

        self.assertEqual(_testcapi.docstring_with_signature_and_extra_newlines.__doc__,
            "\nThis docstring has a valid signature and some extra newlines.")
        self.assertEqual(_testcapi.docstring_with_signature_and_extra_newlines.__text_signature__,
            "($module, /, parameter)")

    def test_c_type_with_matrix_multiplication(self):
        M = _testcapi.matmulType
        m1 = M()
        m2 = M()
        self.assertEqual(m1 @ m2, ("matmul", m1, m2))
        self.assertEqual(m1 @ 42, ("matmul", m1, 42))
        self.assertEqual(42 @ m1, ("matmul", 42, m1))
        o = m1
        o @= m2
        self.assertEqual(o, ("imatmul", m1, m2))
        o = m1
        o @= 42
        self.assertEqual(o, ("imatmul", m1, 42))
        o = 42
        o @= m1
        self.assertEqual(o, ("matmul", 42, m1))

    def test_return_null_without_error(self):
        # Issue #23571: A function must not return NULL without setting an
        # error
        if Py_DEBUG:
            code = textwrap.dedent("""
                import _testcapi
                from test import support

                with support.SuppressCrashReport():
                    _testcapi.return_null_without_error()
            """)
            rc, out, err = assert_python_failure('-c', code)
            self.assertRegex(err.replace(b'\r', b''),
                             br'Fatal Python error: a function returned NULL '
                                br'without setting an error\n'
                             br'SystemError: <built-in function '
                                 br'return_null_without_error> returned NULL '
                                 br'without setting an error\n'
                             br'\n'
                             br'Current thread.*:\n'
                             br'  File .*", line 6 in <module>')
        else:
            with self.assertRaises(SystemError) as cm:
                _testcapi.return_null_without_error()
            # PyPy change: different message
            self.assertRegex(str(cm.exception),
                'Function returned a NULL result without setting an exception')

    def test_return_result_with_error(self):
        # Issue #23571: A function must not return a result with an error set
        if Py_DEBUG:
            code = textwrap.dedent("""
                import _testcapi
                from test import support

                with support.SuppressCrashReport():
                    _testcapi.return_result_with_error()
            """)
            rc, out, err = assert_python_failure('-c', code)
            self.assertRegex(err.replace(b'\r', b''),
                             br'Fatal Python error: a function returned a '
                                br'result with an error set\n'
                             br'ValueError\n'
                             br'\n'
                             br'The above exception was the direct cause '
                                br'of the following exception:\n'
                             br'\n'
                             br'SystemError: <built-in '
                                br'function return_result_with_error> '
                                br'returned a result with an error set\n'
                             br'\n'
                             br'Current thread.*:\n'
                             br'  File .*, line 6 in <module>')
        else:
            with self.assertRaises(SystemError) as cm:
                _testcapi.return_result_with_error()
            # PyPy change: different message
            self.assertRegex(str(cm.exception),
                'An exception was set, but function returned a value')

    def test_buildvalue_N(self):
        _testcapi.test_buildvalue_N()

    @support.cpython_only
    def test_set_nomemory(self):
        code = """if 1:
            import _testcapi

            class C(): pass

            # The first loop tests both functions and that remove_mem_hooks()
            # can be called twice in a row. The second loop checks a call to
            # set_nomemory() after a call to remove_mem_hooks(). The third
            # loop checks the start and stop arguments of set_nomemory().
            for outer_cnt in range(1, 4):
                start = 10 * outer_cnt
                for j in range(100):
                    if j == 0:
                        if outer_cnt != 3:
                            _testcapi.set_nomemory(start)
                        else:
                            _testcapi.set_nomemory(start, start + 1)
                    try:
                        C()
                    except MemoryError as e:
                        if outer_cnt != 3:
                            _testcapi.remove_mem_hooks()
                        print('MemoryError', outer_cnt, j)
                        _testcapi.remove_mem_hooks()
                        break
        """
        rc, out, err = assert_python_ok('-c', code)
        self.assertIn(b'MemoryError 1 10', out)
        self.assertIn(b'MemoryError 2 20', out)
        self.assertIn(b'MemoryError 3 30', out)


@unittest.skipIf(support.check_impl_detail(pypy=True),
                 'Py_AddPendingCall not currently supported.')
@unittest.skipUnless(threading, 'Threading required for this test.')
class TestPendingCalls(unittest.TestCase):

    def pendingcalls_submit(self, l, n):
        def callback():
            #this function can be interrupted by thread switching so let's
            #use an atomic operation
            l.append(None)

        for i in range(n):
            time.sleep(random.random()*0.02) #0.01 secs on average
            #try submitting callback until successful.
            #rely on regular interrupt to flush queue if we are
            #unsuccessful.
            while True:
                if _testcapi._pending_threadfunc(callback):
                    break;

    def pendingcalls_wait(self, l, n, context = None):
        #now, stick around until l[0] has grown to 10
        count = 0;
        while len(l) != n:
            #this busy loop is where we expect to be interrupted to
            #run our callbacks.  Note that callbacks are only run on the
            #main thread
            if False and support.verbose:
                print("(%i)"%(len(l),),)
            for i in range(1000):
                a = i*i
            if context and not context.event.is_set():
                continue
            count += 1
            self.assertTrue(count < 10000,
                "timeout waiting for %i callbacks, got %i"%(n, len(l)))
        if False and support.verbose:
            print("(%i)"%(len(l),))

    def test_pendingcalls_threaded(self):

        #do every callback on a separate thread
        n = 32 #total callbacks
        threads = []
        class foo(object):pass
        context = foo()
        context.l = []
        context.n = 2 #submits per thread
        context.nThreads = n // context.n
        context.nFinished = 0
        context.lock = threading.Lock()
        context.event = threading.Event()

        threads = [threading.Thread(target=self.pendingcalls_thread,
                                    args=(context,))
                   for i in range(context.nThreads)]
        with support.start_threads(threads):
            self.pendingcalls_wait(context.l, n, context)

    def pendingcalls_thread(self, context):
        try:
            self.pendingcalls_submit(context.l, context.n)
        finally:
            with context.lock:
                context.nFinished += 1
                nFinished = context.nFinished
                if False and support.verbose:
                    print("finished threads: ", nFinished)
            if nFinished == context.nThreads:
                context.event.set()

    def test_pendingcalls_non_threaded(self):
        #again, just using the main thread, likely they will all be dispatched at
        #once.  It is ok to ask for too many, because we loop until we find a slot.
        #the loop can be interrupted to dispatch.
        #there are only 32 dispatch slots, so we go for twice that!
        l = []
        n = 64
        self.pendingcalls_submit(l, n)
        self.pendingcalls_wait(l, n)


@unittest.skipIf(support.check_impl_detail(pypy=True),
                "subinterpreters not implemented on PyPy")
class SubinterpreterTest(unittest.TestCase):

    def test_subinterps(self):
        import builtins
        r, w = os.pipe()
        code = """if 1:
            import sys, builtins, pickle
            with open({:d}, "wb") as f:
                pickle.dump(id(sys.modules), f)
                pickle.dump(id(builtins), f)
            """.format(w)
        with open(r, "rb") as f:
            ret = support.run_in_subinterp(code)
            self.assertEqual(ret, 0)
            self.assertNotEqual(pickle.load(f), id(sys.modules))
            self.assertNotEqual(pickle.load(f), id(builtins))


class EmbeddingTests(unittest.TestCase):
    def setUp(self):
        here = os.path.abspath(__file__)
        basepath = os.path.dirname(os.path.dirname(os.path.dirname(here)))
        exename = "_testembed"
        if sys.platform.startswith("win"):
            ext = ("_d" if "_d" in sys.executable else "") + ".exe"
            exename += ext
            exepath = os.path.dirname(sys.executable)
        else:
            exepath = os.path.join(basepath, "Programs")
        self.test_exe = exe = os.path.join(exepath, exename)
        if not os.path.exists(exe):
            self.skipTest("%r doesn't exist" % exe)
        # This is needed otherwise we get a fatal error:
        # "Py_Initialize: Unable to get the locale encoding
        # LookupError: no codec search functions registered: can't find encoding"
        self.oldcwd = os.getcwd()
        os.chdir(basepath)

    def tearDown(self):
        os.chdir(self.oldcwd)

    def run_embedded_interpreter(self, *args, env=None):
        """Runs a test in the embedded interpreter"""
        cmd = [self.test_exe]
        cmd.extend(args)
        if env is not None and sys.platform == 'win32':
            # Windows requires at least the SYSTEMROOT environment variable to
            # start Python.
            env = env.copy()
            env['SYSTEMROOT'] = os.environ['SYSTEMROOT']

        p = subprocess.Popen(cmd,
                             stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE,
                             universal_newlines=True,
                             env=env)
        (out, err) = p.communicate()
        self.assertEqual(p.returncode, 0,
                         "bad returncode %d, stderr is %r" %
                         (p.returncode, err))
        return out, err

    def test_repeated_init_and_subinterpreters(self):
        # This is just a "don't crash" test
        out, err = self.run_embedded_interpreter('repeated_init_and_subinterpreters')
        if support.verbose:
            print()
            print(out)
            print(err)

    def test_forced_io_encoding(self):
        # Checks forced configuration of embedded interpreter IO streams
        env = dict(os.environ, PYTHONIOENCODING="utf-8:surrogateescape")
        out, err = self.run_embedded_interpreter("forced_io_encoding", env=env)
        if support.verbose:
            print()
            print(out)
            print(err)
        expected_stream_encoding = "utf-8"
        expected_errors = "surrogateescape"
        expected_output = '\n'.join([
        "--- Use defaults ---",
        "Expected encoding: default",
        "Expected errors: default",
        "stdin: {in_encoding}:{errors}",
        "stdout: {out_encoding}:{errors}",
        "stderr: {out_encoding}:backslashreplace",
        "--- Set errors only ---",
        "Expected encoding: default",
        "Expected errors: ignore",
        "stdin: {in_encoding}:ignore",
        "stdout: {out_encoding}:ignore",
        "stderr: {out_encoding}:backslashreplace",
        "--- Set encoding only ---",
        "Expected encoding: latin-1",
        "Expected errors: default",
        "stdin: latin-1:{errors}",
        "stdout: latin-1:{errors}",
        "stderr: latin-1:backslashreplace",
        "--- Set encoding and errors ---",
        "Expected encoding: latin-1",
        "Expected errors: replace",
        "stdin: latin-1:replace",
        "stdout: latin-1:replace",
        "stderr: latin-1:backslashreplace"])
        expected_output = expected_output.format(
                                in_encoding=expected_stream_encoding,
                                out_encoding=expected_stream_encoding,
                                errors=expected_errors)
        # This is useful if we ever trip over odd platform behaviour
        self.maxDiff = None
        self.assertEqual(out.strip(), expected_output)

    def test_pre_initialization_api(self):
        """
        Checks the few parts of the C-API that work before the runtine
        is initialized (via Py_Initialize()).
        """
        env = dict(os.environ, PYTHONPATH=os.pathsep.join(sys.path))
        out, err = self.run_embedded_interpreter("pre_initialization_api", env=env)
        self.assertEqual(out, '')
        self.assertEqual(err, '')


@unittest.skipIf(support.check_impl_detail(pypy=True),
                 'Not currently supported under PyPy')
@unittest.skipUnless(threading, 'Threading required for this test.')
class TestThreadState(unittest.TestCase):

    @support.reap_threads
    def test_thread_state(self):
        # some extra thread-state tests driven via _testcapi
        def target():
            idents = []

            def callback():
                idents.append(threading.get_ident())

            _testcapi._test_thread_state(callback)
            a = b = callback
            time.sleep(1)
            # Check our main thread is in the list exactly 3 times.
            self.assertEqual(idents.count(threading.get_ident()), 3,
                             "Couldn't find main thread correctly in the list")

        target()
        t = threading.Thread(target=target)
        t.start()
        t.join()


class Test_testcapi(unittest.TestCase):
    locals().update((name, getattr(_testcapi, name))
                    for name in dir(_testcapi)
                    if name.startswith('test_') and name not in skips and not name.endswith('_code'))


class PyMemDebugTests(unittest.TestCase):
    PYTHONMALLOC = 'debug'
    # '0x04c06e0' or '04C06E0'
    PTR_REGEX = r'(?:0x)?[0-9a-fA-F]+'

    def check(self, code):
        with support.SuppressCrashReport():
            out = assert_python_failure('-c', code,
                                        PYTHONMALLOC=self.PYTHONMALLOC)
        stderr = out.err
        return stderr.decode('ascii', 'replace')

    @unittest.skipIf(support.check_impl_detail(pypy=True),
        "PyMem debugging not implemented on PyPy")
    def test_buffer_overflow(self):
        out = self.check('import _testcapi; _testcapi.pymem_buffer_overflow()')
        regex = (r"Debug memory block at address p={ptr}: API 'm'\n"
                 r"    16 bytes originally requested\n"
                 r"    The [0-9] pad bytes at p-[0-9] are FORBIDDENBYTE, as expected.\n"
                 r"    The [0-9] pad bytes at tail={ptr} are not all FORBIDDENBYTE \(0x[0-9a-f]{{2}}\):\n"
                 r"        at tail\+0: 0x78 \*\*\* OUCH\n"
                 r"        at tail\+1: 0xfb\n"
                 r"        at tail\+2: 0xfb\n"
                 r"        .*\n"
                 r"    The block was made by call #[0-9]+ to debug malloc/realloc.\n"
                 r"    Data at p: cb cb cb .*\n"
                 r"\n"
                 r"Enable tracemalloc to get the memory block allocation traceback\n"
                 r"\n"
                 r"Fatal Python error: bad trailing pad byte")
        regex = regex.format(ptr=self.PTR_REGEX)
        regex = re.compile(regex, flags=re.DOTALL)
        self.assertRegex(out, regex)

    @unittest.skipIf(support.check_impl_detail(pypy=True),
        "PyMem debugging not implemented on PyPy")
    def test_api_misuse(self):
        out = self.check('import _testcapi; _testcapi.pymem_api_misuse()')
        regex = (r"Debug memory block at address p={ptr}: API 'm'\n"
                 r"    16 bytes originally requested\n"
                 r"    The [0-9] pad bytes at p-[0-9] are FORBIDDENBYTE, as expected.\n"
                 r"    The [0-9] pad bytes at tail={ptr} are FORBIDDENBYTE, as expected.\n"
                 r"    The block was made by call #[0-9]+ to debug malloc/realloc.\n"
                 r"    Data at p: cb cb cb .*\n"
                 r"\n"
                 r"Enable tracemalloc to get the memory block allocation traceback\n"
                 r"\n"
                 r"Fatal Python error: bad ID: Allocated using API 'm', verified using API 'r'\n")
        regex = regex.format(ptr=self.PTR_REGEX)
        self.assertRegex(out, regex)

    @unittest.skipUnless(threading, 'Test requires a GIL (multithreading)')
    def check_malloc_without_gil(self, code):
        out = self.check(code)
        expected = ('Fatal Python error: Python memory allocator called '
                    'without holding the GIL')
        self.assertIn(expected, out)

    @support.cpython_only
    def test_pymem_malloc_without_gil(self):
        # Debug hooks must raise an error if PyMem_Malloc() is called
        # without holding the GIL
        code = 'import _testcapi; _testcapi.pymem_malloc_without_gil()'
        self.check_malloc_without_gil(code)

    @support.cpython_only
    def test_pyobject_malloc_without_gil(self):
        # Debug hooks must raise an error if PyObject_Malloc() is called
        # without holding the GIL
        code = 'import _testcapi; _testcapi.pyobject_malloc_without_gil()'
        self.check_malloc_without_gil(code)


class PyMemMallocDebugTests(PyMemDebugTests):
    PYTHONMALLOC = 'malloc_debug'


@unittest.skipUnless(sysconfig.get_config_var('WITH_PYMALLOC') == 1,
                     'need pymalloc')
class PyMemPymallocDebugTests(PyMemDebugTests):
    PYTHONMALLOC = 'pymalloc_debug'


@unittest.skipUnless(Py_DEBUG, 'need Py_DEBUG')
class PyMemDefaultTests(PyMemDebugTests):
    # test default allocator of Python compiled in debug mode
    PYTHONMALLOC = ''


if __name__ == "__main__":
    unittest.main()
