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"""Implementation of gRPC Python interceptors."""
import collections
import grpc
from grpc_opentracing import grpcext
class _UnaryClientInfo(
collections.namedtuple('_UnaryClientInfo',
('full_method', 'timeout',))):
pass
class _StreamClientInfo(
collections.namedtuple('_StreamClientInfo', (
'full_method', 'is_client_stream', 'is_server_stream', 'timeout'))):
pass
class _InterceptorUnaryUnaryMultiCallable(grpc.UnaryUnaryMultiCallable):
def __init__(self, method, base_callable, interceptor):
self._method = method
self._base_callable = base_callable
self._interceptor = interceptor
def __call__(self, request, timeout=None, metadata=None, credentials=None):
def invoker(request, metadata):
return self._base_callable(request, timeout, metadata, credentials)
client_info = _UnaryClientInfo(self._method, timeout)
return self._interceptor.intercept_unary(request, metadata, client_info,
invoker)
def with_call(self, request, timeout=None, metadata=None, credentials=None):
def invoker(request, metadata):
return self._base_callable.with_call(request, timeout, metadata,
credentials)
client_info = _UnaryClientInfo(self._method, timeout)
return self._interceptor.intercept_unary(request, metadata, client_info,
invoker)
def future(self, request, timeout=None, metadata=None, credentials=None):
def invoker(request, metadata):
return self._base_callable.future(request, timeout, metadata,
credentials)
client_info = _UnaryClientInfo(self._method, timeout)
return self._interceptor.intercept_unary(request, metadata, client_info,
invoker)
class _InterceptorUnaryStreamMultiCallable(grpc.UnaryStreamMultiCallable):
def __init__(self, method, base_callable, interceptor):
self._method = method
self._base_callable = base_callable
self._interceptor = interceptor
def __call__(self, request, timeout=None, metadata=None, credentials=None):
def invoker(request, metadata):
return self._base_callable(request, timeout, metadata, credentials)
client_info = _StreamClientInfo(self._method, False, True, timeout)
return self._interceptor.intercept_stream(request, metadata,
client_info, invoker)
class _InterceptorStreamUnaryMultiCallable(grpc.StreamUnaryMultiCallable):
def __init__(self, method, base_callable, interceptor):
self._method = method
self._base_callable = base_callable
self._interceptor = interceptor
def __call__(self,
request_iterator,
timeout=None,
metadata=None,
credentials=None):
def invoker(request_iterator, metadata):
return self._base_callable(request_iterator, timeout, metadata,
credentials)
client_info = _StreamClientInfo(self._method, True, False, timeout)
return self._interceptor.intercept_stream(request_iterator, metadata,
client_info, invoker)
def with_call(self,
request_iterator,
timeout=None,
metadata=None,
credentials=None):
def invoker(request_iterator, metadata):
return self._base_callable.with_call(request_iterator, timeout,
metadata, credentials)
client_info = _StreamClientInfo(self._method, True, False, timeout)
return self._interceptor.intercept_stream(request_iterator, metadata,
client_info, invoker)
def future(self,
request_iterator,
timeout=None,
metadata=None,
credentials=None):
def invoker(request_iterator, metadata):
return self._base_callable.future(request_iterator, timeout,
metadata, credentials)
client_info = _StreamClientInfo(self._method, True, False, timeout)
return self._interceptor.intercept_stream(request_iterator, metadata,
client_info, invoker)
class _InterceptorStreamStreamMultiCallable(grpc.StreamStreamMultiCallable):
def __init__(self, method, base_callable, interceptor):
self._method = method
self._base_callable = base_callable
self._interceptor = interceptor
def __call__(self,
request_iterator,
timeout=None,
metadata=None,
credentials=None):
def invoker(request_iterator, metadata):
return self._base_callable(request_iterator, timeout, metadata,
credentials)
client_info = _StreamClientInfo(self._method, True, True, timeout)
return self._interceptor.intercept_stream(request_iterator, metadata,
client_info, invoker)
class _InterceptorChannel(grpc.Channel):
def __init__(self, channel, interceptor):
self._channel = channel
self._interceptor = interceptor
def subscribe(self, *args, **kwargs):
self._channel.subscribe(*args, **kwargs)
def unsubscribe(self, *args, **kwargs):
self._channel.unsubscribe(*args, **kwargs)
def unary_unary(self,
method,
request_serializer=None,
response_deserializer=None):
base_callable = self._channel.unary_unary(method, request_serializer,
response_deserializer)
if isinstance(self._interceptor, grpcext.UnaryClientInterceptor):
return _InterceptorUnaryUnaryMultiCallable(method, base_callable,
self._interceptor)
else:
return base_callable
def unary_stream(self,
method,
request_serializer=None,
response_deserializer=None):
base_callable = self._channel.unary_stream(method, request_serializer,
response_deserializer)
if isinstance(self._interceptor, grpcext.StreamClientInterceptor):
return _InterceptorUnaryStreamMultiCallable(method, base_callable,
self._interceptor)
else:
return base_callable
def stream_unary(self,
method,
request_serializer=None,
response_deserializer=None):
base_callable = self._channel.stream_unary(method, request_serializer,
response_deserializer)
if isinstance(self._interceptor, grpcext.StreamClientInterceptor):
return _InterceptorStreamUnaryMultiCallable(method, base_callable,
self._interceptor)
else:
return base_callable
def stream_stream(self,
method,
request_serializer=None,
response_deserializer=None):
base_callable = self._channel.stream_stream(method, request_serializer,
response_deserializer)
if isinstance(self._interceptor, grpcext.StreamClientInterceptor):
return _InterceptorStreamStreamMultiCallable(method, base_callable,
self._interceptor)
else:
return base_callable
def intercept_channel(channel, *interceptors):
result = channel
for interceptor in interceptors:
if not isinstance(interceptor, grpcext.UnaryClientInterceptor) and \
not isinstance(interceptor, grpcext.StreamClientInterceptor):
raise TypeError('interceptor must be either a '
'grpcext.UnaryClientInterceptor or a '
'grpcext.StreamClientInterceptor')
result = _InterceptorChannel(result, interceptor)
return result
class _UnaryServerInfo(
collections.namedtuple('_UnaryServerInfo', ('full_method',))):
pass
class _StreamServerInfo(
collections.namedtuple('_StreamServerInfo', (
'full_method', 'is_client_stream', 'is_server_stream'))):
pass
class _InterceptorRpcMethodHandler(grpc.RpcMethodHandler):
def __init__(self, rpc_method_handler, method, interceptor):
self._rpc_method_handler = rpc_method_handler
self._method = method
self._interceptor = interceptor
@property
def request_streaming(self):
return self._rpc_method_handler.request_streaming
@property
def response_streaming(self):
return self._rpc_method_handler.response_streaming
@property
def request_deserializer(self):
return self._rpc_method_handler.request_deserializer
@property
def response_serializer(self):
return self._rpc_method_handler.response_serializer
@property
def unary_unary(self):
if not isinstance(self._interceptor, grpcext.UnaryServerInterceptor):
return self._rpc_method_handler.unary_unary
def adaptation(request, servicer_context):
def handler(request, servicer_context):
return self._rpc_method_handler.unary_unary(request,
servicer_context)
return self._interceptor.intercept_unary(
request, servicer_context,
_UnaryServerInfo(self._method), handler)
return adaptation
@property
def unary_stream(self):
if not isinstance(self._interceptor, grpcext.StreamServerInterceptor):
return self._rpc_method_handler.unary_stream
def adaptation(request, servicer_context):
def handler(request, servicer_context):
return self._rpc_method_handler.unary_stream(request,
servicer_context)
return self._interceptor.intercept_stream(
request, servicer_context,
_StreamServerInfo(self._method, False, True), handler)
return adaptation
@property
def stream_unary(self):
if not isinstance(self._interceptor, grpcext.StreamServerInterceptor):
return self._rpc_method_handler.stream_unary
def adaptation(request_iterator, servicer_context):
def handler(request_iterator, servicer_context):
return self._rpc_method_handler.stream_unary(request_iterator,
servicer_context)
return self._interceptor.intercept_stream(
request_iterator, servicer_context,
_StreamServerInfo(self._method, True, False), handler)
return adaptation
@property
def stream_stream(self):
if not isinstance(self._interceptor, grpcext.StreamServerInterceptor):
return self._rpc_method_handler.stream_stream
def adaptation(request_iterator, servicer_context):
def handler(request_iterator, servicer_context):
return self._rpc_method_handler.stream_stream(request_iterator,
servicer_context)
return self._interceptor.intercept_stream(
request_iterator, servicer_context,
_StreamServerInfo(self._method, True, True), handler)
return adaptation
class _InterceptorGenericRpcHandler(grpc.GenericRpcHandler):
def __init__(self, generic_rpc_handler, interceptor):
self.generic_rpc_handler = generic_rpc_handler
self._interceptor = interceptor
def service(self, handler_call_details):
result = self.generic_rpc_handler.service(handler_call_details)
if result:
result = _InterceptorRpcMethodHandler(
result, handler_call_details.method, self._interceptor)
return result
class _InterceptorServer(grpc.Server):
def __init__(self, server, interceptor):
self._server = server
self._interceptor = interceptor
def add_generic_rpc_handlers(self, generic_rpc_handlers):
generic_rpc_handlers = [
_InterceptorGenericRpcHandler(generic_rpc_handler,
self._interceptor)
for generic_rpc_handler in generic_rpc_handlers
]
return self._server.add_generic_rpc_handlers(generic_rpc_handlers)
def add_insecure_port(self, *args, **kwargs):
return self._server.add_insecure_port(*args, **kwargs)
def add_secure_port(self, *args, **kwargs):
return self._server.add_secure_port(*args, **kwargs)
def start(self, *args, **kwargs):
return self._server.start(*args, **kwargs)
def stop(self, *args, **kwargs):
return self._server.stop(*args, **kwargs)
def intercept_server(server, *interceptors):
result = server
for interceptor in interceptors:
if not isinstance(interceptor, grpcext.UnaryServerInterceptor) and \
not isinstance(interceptor, grpcext.StreamServerInterceptor):
raise TypeError('interceptor must be either a '
'grpcext.UnaryServerInterceptor or a '
'grpcext.StreamServerInterceptor')
result = _InterceptorServer(result, interceptor)
return result
|
