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# Copyright 2017 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.
require_relative 'interceptor_registry'
# GRPC contains the General RPC module.
module GRPC
##
# Base class for interception in GRPC
#
class Interceptor
##
# @param [Hash] options A hash of options that will be used
# by the interceptor. This is an EXPERIMENTAL API.
#
def initialize(options = {})
@options = options || {}
end
end
##
# ClientInterceptor allows for wrapping outbound gRPC client stub requests.
# This is an EXPERIMENTAL API.
#
class ClientInterceptor < Interceptor
##
# Intercept a unary request response call
#
# @param [Object] request
# @param [GRPC::ActiveCall] call
# @param [Method] method
# @param [Hash] metadata
#
def request_response(request: nil, call: nil, method: nil, metadata: nil)
GRPC.logger.debug "Intercepting request response method #{method}" \
" for request #{request} with call #{call} and metadata: #{metadata}"
yield
end
##
# Intercept a client streaming call
#
# @param [Enumerable] requests
# @param [GRPC::ActiveCall] call
# @param [Method] method
# @param [Hash] metadata
#
def client_streamer(requests: nil, call: nil, method: nil, metadata: nil)
GRPC.logger.debug "Intercepting client streamer method #{method}" \
" for requests #{requests} with call #{call} and metadata: #{metadata}"
yield
end
##
# Intercept a server streaming call
#
# @param [Object] request
# @param [GRPC::ActiveCall] call
# @param [Method] method
# @param [Hash] metadata
#
def server_streamer(request: nil, call: nil, method: nil, metadata: nil)
GRPC.logger.debug "Intercepting server streamer method #{method}" \
" for request #{request} with call #{call} and metadata: #{metadata}"
yield
end
##
# Intercept a BiDi streaming call
#
# @param [Enumerable] requests
# @param [GRPC::ActiveCall] call
# @param [Method] method
# @param [Hash] metadata
#
def bidi_streamer(requests: nil, call: nil, method: nil, metadata: nil)
GRPC.logger.debug "Intercepting bidi streamer method #{method}" \
" for requests #{requests} with call #{call} and metadata: #{metadata}"
yield
end
end
##
# ServerInterceptor allows for wrapping gRPC server execution handling.
# This is an EXPERIMENTAL API.
#
class ServerInterceptor < Interceptor
##
# Intercept a unary request response call.
#
# @param [Object] request
# @param [GRPC::ActiveCall::SingleReqView] call
# @param [Method] method
#
def request_response(request: nil, call: nil, method: nil)
GRPC.logger.debug "Intercepting request response method #{method}" \
" for request #{request} with call #{call}"
yield
end
##
# Intercept a client streaming call
#
# @param [GRPC::ActiveCall::MultiReqView] call
# @param [Method] method
#
def client_streamer(call: nil, method: nil)
GRPC.logger.debug "Intercepting client streamer method #{method}" \
" with call #{call}"
yield
end
##
# Intercept a server streaming call
#
# @param [Object] request
# @param [GRPC::ActiveCall::SingleReqView] call
# @param [Method] method
#
def server_streamer(request: nil, call: nil, method: nil)
GRPC.logger.debug "Intercepting server streamer method #{method}" \
" for request #{request} with call #{call}"
yield
end
##
# Intercept a BiDi streaming call
#
# @param [Enumerable<Object>] requests
# @param [GRPC::ActiveCall::MultiReqView] call
# @param [Method] method
#
def bidi_streamer(requests: nil, call: nil, method: nil)
GRPC.logger.debug "Intercepting bidi streamer method #{method}" \
" for requests #{requests} with call #{call}"
yield
end
end
##
# Represents the context in which an interceptor runs. Used to provide an
# injectable mechanism for handling interception. This is an EXPERIMENTAL API.
#
class InterceptionContext
##
# @param [Array<GRPC::Interceptor>]
#
def initialize(interceptors = [])
@interceptors = interceptors.dup
end
##
# Intercept the call and fire out to interceptors in a FIFO execution.
# This is an EXPERIMENTAL API.
#
# @param [Symbol] type The request type
# @param [Hash] args The arguments for the call
#
def intercept!(type, args = {})
return yield if @interceptors.none?
i = @interceptors.pop
return yield unless i
i.send(type, args) do
if @interceptors.any?
intercept!(type, args) do
yield
end
else
yield
end
end
end
end
end
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