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#!/usr/bin/env ruby
# Copyright 2016 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 './end2end_common'
# Service that sleeps for a long time upon receiving an 'echo request'
# Also, this calls it's callback upon receiving an RPC as a method
# of synchronization/waiting for the child to start.
class SleepingEchoServerImpl < Echo::EchoServer::Service
def initialize(received_rpc_callback)
@received_rpc_callback = received_rpc_callback
end
def echo(echo_req, _)
@received_rpc_callback.call
# sleep forever to get the client stuck waiting
sleep
Echo::EchoReply.new(response: echo_req.request)
end
end
def main
STDERR.puts 'start server'
client_started = false
client_started_mu = Mutex.new
client_started_cv = ConditionVariable.new
received_rpc_callback = proc do
client_started_mu.synchronize do
client_started = true
client_started_cv.signal
end
end
service_impl = SleepingEchoServerImpl.new(received_rpc_callback)
# RPCs against the server will all be hanging, so kill thread
# pool workers immediately rather than after waiting for a second.
rpc_server_args = { poll_period: 0, pool_keep_alive: 0 }
server_runner = ServerRunner.new(service_impl, rpc_server_args: rpc_server_args)
server_port = server_runner.run
STDERR.puts 'start client'
_, client_pid = start_client('killed_client_thread_client.rb',
server_port)
client_started_mu.synchronize do
client_started_cv.wait(client_started_mu) until client_started
end
# SIGTERM the child process now that it's
# in the middle of an RPC (happening on a non-main thread)
Process.kill('SIGTERM', client_pid)
STDERR.puts 'sent shutdown'
begin
Timeout.timeout(10) do
Process.wait(client_pid)
end
rescue Timeout::Error
STDERR.puts "timeout wait for client pid #{client_pid}"
Process.kill('SIGKILL', client_pid)
Process.wait(client_pid)
STDERR.puts 'killed client child'
raise 'Timed out waiting for client process. ' \
'It likely hangs when killed while in the middle of an rpc'
end
client_exit_code = $CHILD_STATUS
if client_exit_code.termsig != 15 # SIGTERM
fail 'expected client exit from SIGTERM ' \
"but got child status: #{client_exit_code}"
end
server_runner.stop
end
main
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