# Copyright (C) 2009, 2010 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for smart server request infrastructure (breezy.bzr.smart.request)."""

import threading

from breezy import errors, transport
from breezy.bzr.bzrdir import BzrDir
from breezy.bzr.smart import request
from breezy.tests import TestCase, TestCaseWithMemoryTransport


class NoBodyRequest(request.SmartServerRequest):
    """A request that does not implement do_body."""

    def do(self):
        return request.SuccessfulSmartServerResponse(("ok",))


class DoErrorRequest(request.SmartServerRequest):
    """A request that raises an error from self.do()."""

    def do(self):
        raise transport.NoSuchFile("xyzzy")


class DoUnexpectedErrorRequest(request.SmartServerRequest):
    """A request that encounters a generic error in self.do()."""

    def do(self):
        {}[1]


class ChunkErrorRequest(request.SmartServerRequest):
    """A request that raises an error from self.do_chunk()."""

    def do(self):
        """No-op."""
        pass

    def do_chunk(self, bytes):
        raise transport.NoSuchFile("xyzzy")


class EndErrorRequest(request.SmartServerRequest):
    """A request that raises an error from self.do_end()."""

    def do(self):
        """No-op."""
        pass

    def do_chunk(self, bytes):
        """No-op."""
        pass

    def do_end(self):
        raise transport.NoSuchFile("xyzzy")


class CheckJailRequest(request.SmartServerRequest):
    def __init__(self, *args):
        request.SmartServerRequest.__init__(self, *args)
        self.jail_transports_log = []

    def do(self):
        self.jail_transports_log.append(request.jail_info.transports)

    def do_chunk(self, bytes):
        self.jail_transports_log.append(request.jail_info.transports)

    def do_end(self):
        self.jail_transports_log.append(request.jail_info.transports)


class TestErrors(TestCase):
    def test_disabled_method(self):
        error = request.DisabledMethod("class name")
        self.assertEqualDiff(
            "The smart server method 'class name' is disabled.", str(error)
        )


class TestSmartRequest(TestCase):
    def test_request_class_without_do_body(self):
        """If a request has no body data, and the request's implementation does
        not override do_body, then no exception is raised.
        """
        # Create a SmartServerRequestHandler with a SmartServerRequest subclass
        # that does not implement do_body.
        handler = request.SmartServerRequestHandler(None, {b"foo": NoBodyRequest}, "/")
        # Emulate a request with no body (i.e. just args).
        handler.args_received((b"foo",))
        handler.end_received()
        # Request done, no exception was raised.

    def test_only_request_code_is_jailed(self):
        transport = "dummy transport"
        handler = request.SmartServerRequestHandler(
            transport, {b"foo": CheckJailRequest}, "/"
        )
        handler.args_received((b"foo",))
        self.assertEqual(None, request.jail_info.transports)
        handler.accept_body(b"bytes")
        self.assertEqual(None, request.jail_info.transports)
        handler.end_received()
        self.assertEqual(None, request.jail_info.transports)
        self.assertEqual([[transport]] * 3, handler._command.jail_transports_log)

    def test_all_registered_requests_are_safety_qualified(self):
        unclassified_requests = []
        allowed_info = ("read", "idem", "mutate", "semivfs", "semi", "stream")
        for key in request.request_handlers.keys():
            info = request.request_handlers.get_info(key)
            if info is None or info not in allowed_info:
                unclassified_requests.append(key)
        if unclassified_requests:
            self.fail(
                "These requests were not categorized as safe/unsafe"
                " to retry: {}".format(unclassified_requests)
            )


class TestSmartRequestHandlerErrorTranslation(TestCase):
    """Tests that SmartServerRequestHandler will translate exceptions raised by
    a SmartServerRequest into FailedSmartServerResponses.
    """

    def assertNoResponse(self, handler):
        self.assertEqual(None, handler.response)

    def assertResponseIsTranslatedError(self, handler):
        expected_translation = (b"NoSuchFile", b"xyzzy")
        self.assertEqual(
            request.FailedSmartServerResponse(expected_translation), handler.response
        )

    def test_error_translation_from_args_received(self):
        handler = request.SmartServerRequestHandler(None, {b"foo": DoErrorRequest}, "/")
        handler.args_received((b"foo",))
        self.assertResponseIsTranslatedError(handler)

    def test_error_translation_from_chunk_received(self):
        handler = request.SmartServerRequestHandler(
            None, {b"foo": ChunkErrorRequest}, "/"
        )
        handler.args_received((b"foo",))
        self.assertNoResponse(handler)
        handler.accept_body(b"bytes")
        self.assertResponseIsTranslatedError(handler)

    def test_error_translation_from_end_received(self):
        handler = request.SmartServerRequestHandler(
            None, {b"foo": EndErrorRequest}, "/"
        )
        handler.args_received((b"foo",))
        self.assertNoResponse(handler)
        handler.end_received()
        self.assertResponseIsTranslatedError(handler)

    def test_unexpected_error_translation(self):
        handler = request.SmartServerRequestHandler(
            None, {b"foo": DoUnexpectedErrorRequest}, "/"
        )
        handler.args_received((b"foo",))
        self.assertEqual(
            request.FailedSmartServerResponse((b"error", b"KeyError", b"1")),
            handler.response,
        )


class TestRequestHanderErrorTranslation(TestCase):
    """Tests for breezy.bzr.smart.request._translate_error."""

    def assertTranslationEqual(self, expected_tuple, error):
        self.assertEqual(expected_tuple, request._translate_error(error))

    def test_NoSuchFile(self):
        self.assertTranslationEqual(
            (b"NoSuchFile", b"path"), transport.NoSuchFile("path")
        )

    def test_LockContention(self):
        # For now, LockContentions are always transmitted with no details.
        # Eventually they should include a relpath or url or something else to
        # identify which lock is busy.
        self.assertTranslationEqual(
            (b"LockContention",), errors.LockContention("lock", "msg")
        )

    def test_TokenMismatch(self):
        self.assertTranslationEqual(
            (b"TokenMismatch", b"some-token", b"actual-token"),
            errors.TokenMismatch(b"some-token", b"actual-token"),
        )

    def test_MemoryError(self):
        self.assertTranslationEqual((b"MemoryError",), MemoryError())

    def test_GhostRevisionsHaveNoRevno(self):
        self.assertTranslationEqual(
            (b"GhostRevisionsHaveNoRevno", b"revid1", b"revid2"),
            errors.GhostRevisionsHaveNoRevno(b"revid1", b"revid2"),
        )

    def test_generic_Exception(self):
        self.assertTranslationEqual((b"error", b"Exception", b""), Exception())

    def test_generic_BzrError(self):
        self.assertTranslationEqual(
            (b"error", b"BzrError", b"some text"), errors.BzrError(msg="some text")
        )

    def test_generic_zlib_error(self):
        from zlib import error

        msg = "Error -3 while decompressing data: incorrect data check"
        self.assertTranslationEqual(
            (b"error", b"zlib.error", msg.encode("utf-8")), error(msg)
        )


class TestRequestJail(TestCaseWithMemoryTransport):
    def test_jail(self):
        transport = self.get_transport("blah")
        req = request.SmartServerRequest(transport)
        self.assertEqual(None, request.jail_info.transports)
        req.setup_jail()
        self.assertEqual([transport], request.jail_info.transports)
        req.teardown_jail()
        self.assertEqual(None, request.jail_info.transports)


class TestJailHook(TestCaseWithMemoryTransport):
    def setUp(self):
        super().setUp()

        def clear_jail_info():
            request.jail_info.transports = None

        self.addCleanup(clear_jail_info)

    def test_jail_hook(self):
        request.jail_info.transports = None
        _pre_open_hook = request._pre_open_hook
        # Any transport is fine if jail_info.transports is None
        t = self.get_transport("foo")
        _pre_open_hook(t)
        # A transport in jail_info.transports is allowed
        request.jail_info.transports = [t]
        _pre_open_hook(t)
        # A child of a transport in jail_info is allowed
        _pre_open_hook(t.clone("child"))
        # A parent is not allowed
        self.assertRaises(errors.JailBreak, _pre_open_hook, t.clone(".."))
        # A completely unrelated transport is not allowed
        self.assertRaises(
            errors.JailBreak,
            _pre_open_hook,
            transport.get_transport_from_url("http://host/"),
        )

    def test_open_bzrdir_in_non_main_thread(self):
        """Opening a bzrdir in a non-main thread should work ok.

        This makes sure that the globally-installed
        breezy.bzr.smart.request._pre_open_hook, which uses a threading.local(),
        works in a newly created thread.
        """
        bzrdir = self.make_controldir(".")
        transport = bzrdir.root_transport
        thread_result = []

        def t():
            BzrDir.open_from_transport(transport)
            thread_result.append("ok")

        thread = threading.Thread(target=t)
        thread.start()
        thread.join()
        self.assertEqual(["ok"], thread_result)
