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# Copyright 2015-2016, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
require 'grpc/grpc'
# GRPC contains the General RPC module.
module GRPC
# RpcDesc is a Descriptor of an RPC method.
class RpcDesc < Struct.new(:name, :input, :output, :marshal_method,
:unmarshal_method)
include Core::StatusCodes
# Used to wrap a message class to indicate that it needs to be streamed.
class Stream
attr_accessor :type
def initialize(type)
@type = type
end
end
# @return [Proc] { |instance| marshalled(instance) }
def marshal_proc
proc { |o| o.class.method(marshal_method).call(o).to_s }
end
# @param [:input, :output] target determines whether to produce the an
# unmarshal Proc for the rpc input parameter or
# its output parameter
#
# @return [Proc] An unmarshal proc { |marshalled(instance)| instance }
def unmarshal_proc(target)
fail ArgumentError unless [:input, :output].include?(target)
unmarshal_class = method(target).call
unmarshal_class = unmarshal_class.type if unmarshal_class.is_a? Stream
proc { |o| unmarshal_class.method(unmarshal_method).call(o) }
end
def run_server_method(active_call, mth)
# While a server method is running, it might be cancelled, its deadline
# might be reached, the handler could throw an unknown error, or a
# well-behaved handler could throw a StatusError.
if request_response?
req = active_call.remote_read
resp = mth.call(req, active_call.single_req_view)
active_call.remote_send(resp)
elsif client_streamer?
resp = mth.call(active_call.multi_req_view)
active_call.remote_send(resp)
elsif server_streamer?
req = active_call.remote_read
replys = mth.call(req, active_call.single_req_view)
replys.each { |r| active_call.remote_send(r) }
else # is a bidi_stream
active_call.run_server_bidi(mth)
end
send_status(active_call, OK, 'OK', **active_call.output_metadata)
rescue BadStatus => e
# this is raised by handlers that want GRPC to send an application error
# code and detail message and some additional app-specific metadata.
GRPC.logger.debug("app err:#{active_call}, status:#{e.code}:#{e.details}")
send_status(active_call, e.code, e.details, **e.metadata)
rescue Core::CallError => e
# This is raised by GRPC internals but should rarely, if ever happen.
# Log it, but don't notify the other endpoint..
GRPC.logger.warn("failed call: #{active_call}\n#{e}")
rescue Core::OutOfTime
# This is raised when active_call#method.call exceeeds the deadline
# event. Send a status of deadline exceeded
GRPC.logger.warn("late call: #{active_call}")
send_status(active_call, DEADLINE_EXCEEDED, 'late')
rescue StandardError => e
# This will usuaally be an unhandled error in the handling code.
# Send back a UNKNOWN status to the client
GRPC.logger.warn("failed handler: #{active_call}; sending status:UNKNOWN")
GRPC.logger.warn(e)
send_status(active_call, UNKNOWN, 'no reason given')
end
def assert_arity_matches(mth)
if request_response? || server_streamer?
if mth.arity != 2
fail arity_error(mth, 2, "should be #{mth.name}(req, call)")
end
else
if mth.arity != 1
fail arity_error(mth, 1, "should be #{mth.name}(call)")
end
end
end
def request_response?
!input.is_a?(Stream) && !output.is_a?(Stream)
end
def client_streamer?
input.is_a?(Stream) && !output.is_a?(Stream)
end
def server_streamer?
!input.is_a?(Stream) && output.is_a?(Stream)
end
def bidi_streamer?
input.is_a?(Stream) && output.is_a?(Stream)
end
def arity_error(mth, want, msg)
"##{mth.name}: bad arg count; got:#{mth.arity}, want:#{want}, #{msg}"
end
def send_status(active_client, code, details, **kw)
details = 'Not sure why' if details.nil?
GRPC.logger.debug("Sending status #{code}:#{details}")
active_client.send_status(code, details, code == OK, **kw)
rescue StandardError => e
GRPC.logger.warn("Could not send status #{code}:#{details}")
GRPC.logger.warn(e)
end
end
end
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