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# Copyright 2015 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 'grpc'
require 'timeout'
include Timeout
include GRPC::Core
# A test message
class EchoMsg
def self.marshal(_o)
''
end
def self.unmarshal(_o)
EchoMsg.new
end
end
# A test service with an echo implementation.
class EchoService
include GRPC::GenericService
rpc :an_rpc, EchoMsg, EchoMsg
attr_reader :received_md
def initialize(**kw)
@trailing_metadata = kw
@received_md = []
end
def an_rpc(req, call)
GRPC.logger.info('echo service received a request')
call.output_metadata.update(@trailing_metadata)
@received_md << call.metadata unless call.metadata.nil?
req
end
end
EchoStub = EchoService.rpc_stub_class
def start_server(port = 0)
@srv = GRPC::RpcServer.new(pool_size: 1)
server_port = @srv.add_http2_port("localhost:#{port}", :this_port_is_insecure)
@srv.handle(EchoService)
@server_thd = Thread.new { @srv.run }
@srv.wait_till_running
server_port
end
def stop_server
expect(@srv.stopped?).to be(false)
@srv.stop
@server_thd.join
expect(@srv.stopped?).to be(true)
end
describe 'channel connection behavior' do
it 'the client channel handles temporary loss of a transport' do
port = start_server
stub = EchoStub.new("localhost:#{port}", :this_channel_is_insecure)
req = EchoMsg.new
expect(stub.an_rpc(req)).to be_a(EchoMsg)
stop_server
sleep 1
# TODO(apolcyn) grabbing the same port might fail, is this stable enough?
start_server(port)
expect(stub.an_rpc(req)).to be_a(EchoMsg)
stop_server
end
it 'observably connects and reconnects to transient server' \
' when using the channel state API' do
port = start_server
ch = GRPC::Core::Channel.new("localhost:#{port}", {},
:this_channel_is_insecure)
expect(ch.connectivity_state).to be(GRPC::Core::ConnectivityStates::IDLE)
state = ch.connectivity_state(true)
count = 0
while count < 20 && state != GRPC::Core::ConnectivityStates::READY
ch.watch_connectivity_state(state, Time.now + 60)
state = ch.connectivity_state(true)
count += 1
end
expect(state).to be(GRPC::Core::ConnectivityStates::READY)
stop_server
state = ch.connectivity_state
count = 0
while count < 20 && state == GRPC::Core::ConnectivityStates::READY
ch.watch_connectivity_state(state, Time.now + 60)
state = ch.connectivity_state
count += 1
end
expect(state).to_not be(GRPC::Core::ConnectivityStates::READY)
start_server(port)
state = ch.connectivity_state(true)
count = 0
while count < 20 && state != GRPC::Core::ConnectivityStates::READY
ch.watch_connectivity_state(state, Time.now + 60)
state = ch.connectivity_state(true)
count += 1
end
expect(state).to be(GRPC::Core::ConnectivityStates::READY)
stop_server
end
it 'concurrent watches on the same channel' do
timeout(180) do
port = start_server
ch = GRPC::Core::Channel.new("localhost:#{port}", {},
:this_channel_is_insecure)
stop_server
thds = []
50.times do
thds << Thread.new do
while ch.connectivity_state(true) != ConnectivityStates::READY
ch.watch_connectivity_state(
ConnectivityStates::READY, Time.now + 60)
break
end
end
end
sleep 0.01
start_server(port)
thds.each(&:join)
stop_server
end
end
end
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