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"""Tests Face interface compliance of the gRPC Python Beta API."""

import threading
import unittest

from grpc.beta import implementations
from grpc.beta import interfaces
from grpc.framework.common import cardinality
from grpc.framework.interfaces.face import utilities
from tests.unit import resources
from tests.unit.beta import test_utilities
from tests.unit.framework.common import test_constants

_SERVER_HOST_OVERRIDE = 'foo.test.google.fr'

_PER_RPC_CREDENTIALS_METADATA_KEY = b'my-call-credentials-metadata-key'
_PER_RPC_CREDENTIALS_METADATA_VALUE = b'my-call-credentials-metadata-value'

_GROUP = 'group'
_UNARY_UNARY = 'unary-unary'
_UNARY_STREAM = 'unary-stream'
_STREAM_UNARY = 'stream-unary'
_STREAM_STREAM = 'stream-stream'

_REQUEST = b'abc'
_RESPONSE = b'123'


class _Servicer(object):

  def __init__(self):
    self._condition = threading.Condition()
    self._peer = None
    self._serviced = False

  def unary_unary(self, request, context):
    with self._condition:
      self._request = request
      self._peer = context.protocol_context().peer()
      self._invocation_metadata = context.invocation_metadata()
      context.protocol_context().disable_next_response_compression()
      self._serviced = True
      self._condition.notify_all()
      return _RESPONSE

  def unary_stream(self, request, context):
    with self._condition:
      self._request = request
      self._peer = context.protocol_context().peer()
      self._invocation_metadata = context.invocation_metadata()
      context.protocol_context().disable_next_response_compression()
      self._serviced = True
      self._condition.notify_all()
      return
      yield

  def stream_unary(self, request_iterator, context):
    for request in request_iterator:
      self._request = request
    with self._condition:
      self._peer = context.protocol_context().peer()
      self._invocation_metadata = context.invocation_metadata()
      context.protocol_context().disable_next_response_compression()
      self._serviced = True
      self._condition.notify_all()
      return _RESPONSE

  def stream_stream(self, request_iterator, context):
    for request in request_iterator:
      with self._condition:
        self._peer = context.protocol_context().peer()
        context.protocol_context().disable_next_response_compression()
        yield _RESPONSE
    with self._condition:
      self._invocation_metadata = context.invocation_metadata()
      self._serviced = True
      self._condition.notify_all()

  def peer(self):
    with self._condition:
      return self._peer

  def block_until_serviced(self):
    with self._condition:
      while not self._serviced:
        self._condition.wait()


class _BlockingIterator(object):

  def __init__(self, upstream):
    self._condition = threading.Condition()
    self._upstream = upstream
    self._allowed = []

  def __iter__(self):
    return self

  def __next__(self):
    return self.next()

  def next(self):
    with self._condition:
      while True:
        if self._allowed is None:
          raise StopIteration()
        elif self._allowed:
          return self._allowed.pop(0)
        else:
          self._condition.wait()

  def allow(self):
    with self._condition:
      try:
        self._allowed.append(next(self._upstream))
      except StopIteration:
        self._allowed = None
      self._condition.notify_all()


def _metadata_plugin(context, callback):
  callback([(_PER_RPC_CREDENTIALS_METADATA_KEY,
             _PER_RPC_CREDENTIALS_METADATA_VALUE)], None)


class BetaFeaturesTest(unittest.TestCase):

  def setUp(self):
    self._servicer = _Servicer()
    method_implementations = {
        (_GROUP, _UNARY_UNARY):
            utilities.unary_unary_inline(self._servicer.unary_unary),
        (_GROUP, _UNARY_STREAM):
            utilities.unary_stream_inline(self._servicer.unary_stream),
        (_GROUP, _STREAM_UNARY):
            utilities.stream_unary_inline(self._servicer.stream_unary),
        (_GROUP, _STREAM_STREAM):
            utilities.stream_stream_inline(self._servicer.stream_stream),
    }

    cardinalities = {
        _UNARY_UNARY: cardinality.Cardinality.UNARY_UNARY,
        _UNARY_STREAM: cardinality.Cardinality.UNARY_STREAM,
        _STREAM_UNARY: cardinality.Cardinality.STREAM_UNARY,
        _STREAM_STREAM: cardinality.Cardinality.STREAM_STREAM,
    }

    server_options = implementations.server_options(
        thread_pool_size=test_constants.POOL_SIZE)
    self._server = implementations.server(
        method_implementations, options=server_options)
    server_credentials = implementations.ssl_server_credentials(
        [(resources.private_key(), resources.certificate_chain(),),])
    port = self._server.add_secure_port('[::]:0', server_credentials)
    self._server.start()
    self._channel_credentials = implementations.ssl_channel_credentials(
        resources.test_root_certificates())
    self._call_credentials = implementations.metadata_call_credentials(
        _metadata_plugin)
    channel = test_utilities.not_really_secure_channel(
        'localhost', port, self._channel_credentials, _SERVER_HOST_OVERRIDE)
    stub_options = implementations.stub_options(
        thread_pool_size=test_constants.POOL_SIZE)
    self._dynamic_stub = implementations.dynamic_stub(
        channel, _GROUP, cardinalities, options=stub_options)

  def tearDown(self):
    self._dynamic_stub = None
    self._server.stop(test_constants.SHORT_TIMEOUT).wait()

  def test_unary_unary(self):
    call_options = interfaces.grpc_call_options(
        disable_compression=True, credentials=self._call_credentials)
    response = getattr(self._dynamic_stub, _UNARY_UNARY)(
        _REQUEST, test_constants.LONG_TIMEOUT, protocol_options=call_options)
    self.assertEqual(_RESPONSE, response)
    self.assertIsNotNone(self._servicer.peer())
    invocation_metadata = [(metadatum.key, metadatum.value) for metadatum in
                           self._servicer._invocation_metadata]
    self.assertIn(
        (_PER_RPC_CREDENTIALS_METADATA_KEY,
         _PER_RPC_CREDENTIALS_METADATA_VALUE),
        invocation_metadata)

  def test_unary_stream(self):
    call_options = interfaces.grpc_call_options(
        disable_compression=True, credentials=self._call_credentials)
    response_iterator = getattr(self._dynamic_stub, _UNARY_STREAM)(
        _REQUEST, test_constants.LONG_TIMEOUT, protocol_options=call_options)
    self._servicer.block_until_serviced()
    self.assertIsNotNone(self._servicer.peer())
    invocation_metadata = [(metadatum.key, metadatum.value) for metadatum in
                           self._servicer._invocation_metadata]
    self.assertIn(
        (_PER_RPC_CREDENTIALS_METADATA_KEY,
         _PER_RPC_CREDENTIALS_METADATA_VALUE),
        invocation_metadata)

  def test_stream_unary(self):
    call_options = interfaces.grpc_call_options(
        credentials=self._call_credentials)
    request_iterator = _BlockingIterator(iter((_REQUEST,)))
    response_future = getattr(self._dynamic_stub, _STREAM_UNARY).future(
        request_iterator, test_constants.LONG_TIMEOUT,
        protocol_options=call_options)
    response_future.protocol_context().disable_next_request_compression()
    request_iterator.allow()
    response_future.protocol_context().disable_next_request_compression()
    request_iterator.allow()
    self._servicer.block_until_serviced()
    self.assertIsNotNone(self._servicer.peer())
    self.assertEqual(_RESPONSE, response_future.result())
    invocation_metadata = [(metadatum.key, metadatum.value) for metadatum in
                           self._servicer._invocation_metadata]
    self.assertIn(
        (_PER_RPC_CREDENTIALS_METADATA_KEY,
         _PER_RPC_CREDENTIALS_METADATA_VALUE),
        invocation_metadata)

  def test_stream_stream(self):
    call_options = interfaces.grpc_call_options(
        credentials=self._call_credentials)
    request_iterator = _BlockingIterator(iter((_REQUEST,)))
    response_iterator = getattr(self._dynamic_stub, _STREAM_STREAM)(
        request_iterator, test_constants.SHORT_TIMEOUT,
        protocol_options=call_options)
    response_iterator.protocol_context().disable_next_request_compression()
    request_iterator.allow()
    response = next(response_iterator)
    response_iterator.protocol_context().disable_next_request_compression()
    request_iterator.allow()
    self._servicer.block_until_serviced()
    self.assertIsNotNone(self._servicer.peer())
    self.assertEqual(_RESPONSE, response)
    invocation_metadata = [(metadatum.key, metadatum.value) for metadatum in
                           self._servicer._invocation_metadata]
    self.assertIn(
        (_PER_RPC_CREDENTIALS_METADATA_KEY,
         _PER_RPC_CREDENTIALS_METADATA_VALUE),
        invocation_metadata)


class ContextManagementAndLifecycleTest(unittest.TestCase):

  def setUp(self):
    self._servicer = _Servicer()
    self._method_implementations = {
        (_GROUP, _UNARY_UNARY):
            utilities.unary_unary_inline(self._servicer.unary_unary),
        (_GROUP, _UNARY_STREAM):
            utilities.unary_stream_inline(self._servicer.unary_stream),
        (_GROUP, _STREAM_UNARY):
            utilities.stream_unary_inline(self._servicer.stream_unary),
        (_GROUP, _STREAM_STREAM):
            utilities.stream_stream_inline(self._servicer.stream_stream),
    }

    self._cardinalities = {
        _UNARY_UNARY: cardinality.Cardinality.UNARY_UNARY,
        _UNARY_STREAM: cardinality.Cardinality.UNARY_STREAM,
        _STREAM_UNARY: cardinality.Cardinality.STREAM_UNARY,
        _STREAM_STREAM: cardinality.Cardinality.STREAM_STREAM,
    }

    self._server_options = implementations.server_options(
        thread_pool_size=test_constants.POOL_SIZE)
    self._server_credentials = implementations.ssl_server_credentials(
        [(resources.private_key(), resources.certificate_chain(),),])
    self._channel_credentials = implementations.ssl_channel_credentials(
        resources.test_root_certificates())
    self._stub_options = implementations.stub_options(
        thread_pool_size=test_constants.POOL_SIZE)

  def test_stub_context(self):
    server = implementations.server(
        self._method_implementations, options=self._server_options)
    port = server.add_secure_port('[::]:0', self._server_credentials)
    server.start()

    channel = test_utilities.not_really_secure_channel(
        'localhost', port, self._channel_credentials, _SERVER_HOST_OVERRIDE)
    dynamic_stub = implementations.dynamic_stub(
        channel, _GROUP, self._cardinalities, options=self._stub_options)
    for _ in range(100):
      with dynamic_stub:
        pass
    for _ in range(10):
      with dynamic_stub:
        call_options = interfaces.grpc_call_options(
            disable_compression=True)
        response = getattr(dynamic_stub, _UNARY_UNARY)(
            _REQUEST, test_constants.LONG_TIMEOUT,
            protocol_options=call_options)
        self.assertEqual(_RESPONSE, response)
        self.assertIsNotNone(self._servicer.peer())

    server.stop(test_constants.SHORT_TIMEOUT).wait()

  def test_server_lifecycle(self):
    for _ in range(100):
      server = implementations.server(
          self._method_implementations, options=self._server_options)
      port = server.add_secure_port('[::]:0', self._server_credentials)
      server.start()
      server.stop(test_constants.SHORT_TIMEOUT).wait()
    for _ in range(100):
      server = implementations.server(
          self._method_implementations, options=self._server_options)
      server.add_secure_port('[::]:0', self._server_credentials)
      server.add_insecure_port('[::]:0')
      with server:
        server.stop(test_constants.SHORT_TIMEOUT)
      server.stop(test_constants.SHORT_TIMEOUT)


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