# Copyright 2016 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Test of RPCs made against gRPC Python's application-layer API."""

import unittest
import logging

import grpc

from tests.unit.framework.common import test_constants

_SERIALIZE_REQUEST = lambda bytestring: bytestring * 2
_DESERIALIZE_REQUEST = lambda bytestring: bytestring[len(bytestring) // 2:]
_SERIALIZE_RESPONSE = lambda bytestring: bytestring * 3
_DESERIALIZE_RESPONSE = lambda bytestring: bytestring[:len(bytestring) // 3]

_UNARY_UNARY = '/test/UnaryUnary'
_UNARY_STREAM = '/test/UnaryStream'
_STREAM_UNARY = '/test/StreamUnary'
_STREAM_STREAM = '/test/StreamStream'


def _unary_unary_multi_callable(channel):
    return channel.unary_unary(_UNARY_UNARY)


def _unary_stream_multi_callable(channel):
    return channel.unary_stream(_UNARY_STREAM,
                                request_serializer=_SERIALIZE_REQUEST,
                                response_deserializer=_DESERIALIZE_RESPONSE)


def _stream_unary_multi_callable(channel):
    return channel.stream_unary(_STREAM_UNARY,
                                request_serializer=_SERIALIZE_REQUEST,
                                response_deserializer=_DESERIALIZE_RESPONSE)


def _stream_stream_multi_callable(channel):
    return channel.stream_stream(_STREAM_STREAM)


class InvalidMetadataTest(unittest.TestCase):

    def setUp(self):
        self._channel = grpc.insecure_channel('localhost:8080')
        self._unary_unary = _unary_unary_multi_callable(self._channel)
        self._unary_stream = _unary_stream_multi_callable(self._channel)
        self._stream_unary = _stream_unary_multi_callable(self._channel)
        self._stream_stream = _stream_stream_multi_callable(self._channel)

    def tearDown(self):
        self._channel.close()

    def testUnaryRequestBlockingUnaryResponse(self):
        request = b'\x07\x08'
        metadata = (('InVaLiD', 'UnaryRequestBlockingUnaryResponse'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._unary_unary(request, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testUnaryRequestBlockingUnaryResponseWithCall(self):
        request = b'\x07\x08'
        metadata = (('InVaLiD', 'UnaryRequestBlockingUnaryResponseWithCall'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._unary_unary.with_call(request, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testUnaryRequestFutureUnaryResponse(self):
        request = b'\x07\x08'
        metadata = (('InVaLiD', 'UnaryRequestFutureUnaryResponse'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._unary_unary.future(request, metadata=metadata)

    def testUnaryRequestStreamResponse(self):
        request = b'\x37\x58'
        metadata = (('InVaLiD', 'UnaryRequestStreamResponse'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._unary_stream(request, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testStreamRequestBlockingUnaryResponse(self):
        request_iterator = (
            b'\x07\x08' for _ in range(test_constants.STREAM_LENGTH))
        metadata = (('InVaLiD', 'StreamRequestBlockingUnaryResponse'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._stream_unary(request_iterator, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testStreamRequestBlockingUnaryResponseWithCall(self):
        request_iterator = (
            b'\x07\x08' for _ in range(test_constants.STREAM_LENGTH))
        metadata = (('InVaLiD', 'StreamRequestBlockingUnaryResponseWithCall'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        multi_callable = _stream_unary_multi_callable(self._channel)
        with self.assertRaises(ValueError) as exception_context:
            multi_callable.with_call(request_iterator, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testStreamRequestFutureUnaryResponse(self):
        request_iterator = (
            b'\x07\x08' for _ in range(test_constants.STREAM_LENGTH))
        metadata = (('InVaLiD', 'StreamRequestFutureUnaryResponse'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._stream_unary.future(request_iterator, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testStreamRequestStreamResponse(self):
        request_iterator = (
            b'\x07\x08' for _ in range(test_constants.STREAM_LENGTH))
        metadata = (('InVaLiD', 'StreamRequestStreamResponse'),)
        expected_error_details = "metadata was invalid: %s" % metadata
        with self.assertRaises(ValueError) as exception_context:
            self._stream_stream(request_iterator, metadata=metadata)
        self.assertIn(expected_error_details, str(exception_context.exception))

    def testInvalidMetadata(self):
        self.assertRaises(TypeError, self._unary_unary, b'', metadata=42)


if __name__ == '__main__':
    logging.basicConfig()
    unittest.main(verbosity=2)
