1#!/usr/bin/env ruby 2# 3# Copyright 2016 gRPC authors. 4# 5# Licensed under the Apache License, Version 2.0 (the "License"); 6# you may not use this file except in compliance with the License. 7# You may obtain a copy of the License at 8# 9# http://www.apache.org/licenses/LICENSE-2.0 10# 11# Unless required by applicable law or agreed to in writing, software 12# distributed under the License is distributed on an "AS IS" BASIS, 13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14# See the License for the specific language governing permissions and 15# limitations under the License. 16 17ENV['GRPC_ENABLE_FORK_SUPPORT'] = "1" 18fail "forking only supported on linux" unless RUBY_PLATFORM =~ /linux/ 19 20this_dir = File.expand_path(File.dirname(__FILE__)) 21protos_lib_dir = File.join(this_dir, 'lib') 22grpc_lib_dir = File.join(File.dirname(this_dir), 'lib') 23$LOAD_PATH.unshift(grpc_lib_dir) unless $LOAD_PATH.include?(grpc_lib_dir) 24$LOAD_PATH.unshift(protos_lib_dir) unless $LOAD_PATH.include?(protos_lib_dir) 25$LOAD_PATH.unshift(this_dir) unless $LOAD_PATH.include?(this_dir) 26 27require 'grpc' 28require 'end2end_common' 29 30def do_rpc(stub) 31 stub.echo(Echo::EchoRequest.new(request: 'hello'), deadline: Time.now + 300) 32end 33 34def run_client(stub) 35 do_rpc(stub) 36 with_logging("parent: GRPC.prefork") { GRPC.prefork } 37 pid = fork do 38 with_logging("child1: GRPC.postfork_child") { GRPC.postfork_child } 39 with_logging("child1: first post-fork RPC") { do_rpc(stub) } 40 with_logging("child1: GRPC.prefork") { GRPC.prefork } 41 pid2 = fork do 42 with_logging("child2: GRPC.postfork_child") { GRPC.postfork_child } 43 with_logging("child2: first post-fork RPC") { do_rpc(stub) } 44 with_logging("child2: second post-fork RPC") { do_rpc(stub) } 45 STDERR.puts "child2: done" 46 end 47 with_logging("child1: GRPC.postfork_parent") { GRPC.postfork_parent } 48 with_logging("child1: second post-fork RPC") { do_rpc(stub) } 49 Process.wait(pid2) 50 STDERR.puts "child1: done" 51 end 52 with_logging("parent: GRPC.postfork_parent") { GRPC.postfork_parent } 53 with_logging("parent: first post-fork RPC") { do_rpc(stub) } 54 with_logging("parent: second post-fork RPC") { do_rpc(stub) } 55 Process.wait pid 56 STDERR.puts "parent: done" 57end 58 59def main 60 this_dir = File.expand_path(File.dirname(__FILE__)) 61 echo_server_path = File.join(this_dir, 'echo_server.rb') 62 to_child_r, _to_child_w = IO.pipe 63 to_parent_r, to_parent_w = IO.pipe 64 # Note gRPC has not yet been initialized, otherwise we would need to call prefork 65 # before spawn and postfork_parent after. 66 # TODO(apolcyn): consider redirecting server's stderr to a file 67 Process.spawn(RbConfig.ruby, echo_server_path, in: to_child_r, out: to_parent_w, err: "server_log") 68 to_child_r.close 69 to_parent_w.close 70 child_port = to_parent_r.gets.strip 71 STDERR.puts "server running on port: #{child_port}" 72 stub = Echo::EchoServer::Stub.new("localhost:#{child_port}", :this_channel_is_insecure) 73 2.times do 74 run_client(stub) 75 end 76end 77 78main 79