Initial checkin of gRPC to third_party/

third_party/grpc/src/ruby/spec/generic/rpc_server_spec.rb

Index: third_party/grpc/src/ruby/spec/generic/rpc_server_spec.rb
diff --git a/third_party/grpc/src/ruby/spec/generic/rpc_server_spec.rb b/third_party/grpc/src/ruby/spec/generic/rpc_server_spec.rb
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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'
+
+def load_test_certs
+  test_root = File.join(File.dirname(File.dirname(__FILE__)), 'testdata')
+  files = ['ca.pem', 'server1.key', 'server1.pem']
+  files.map { |f| File.open(File.join(test_root, f)).read }
+end
+
+def check_md(wanted_md, received_md)
+  wanted_md.zip(received_md).each do |w, r|
+    w.each do |key, value|
+      expect(r[key]).to eq(value)
+    end
+  end
+end
+
+# A test message
+class EchoMsg
+  def self.marshal(_o)
+    ''
+  end
+
+  def self.unmarshal(_o)
+    EchoMsg.new
+  end
+end
+
+# A test service with no methods.
+class EmptyService
+  include GRPC::GenericService
+end
+
+# A test service without an implementation.
+class NoRpcImplementation
+  include GRPC::GenericService
+  rpc :an_rpc, EchoMsg, EchoMsg
+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
+
+# A test service with an implementation that fails with BadStatus
+class FailingService
+  include GRPC::GenericService
+  rpc :an_rpc, EchoMsg, EchoMsg
+  attr_reader :details, :code, :md
+
+  def initialize(_default_var = 'ignored')
+    @details = 'app error'
+    @code = 101
+    @md = { failed_method: 'an_rpc' }
+  end
+
+  def an_rpc(_req, _call)
+    fail GRPC::BadStatus.new(@code, @details, **@md)
+  end
+end
+
+FailingStub = FailingService.rpc_stub_class
+
+# A slow test service.
+class SlowService
+  include GRPC::GenericService
+  rpc :an_rpc, EchoMsg, EchoMsg
+  attr_reader :received_md, :delay
+
+  def initialize(_default_var = 'ignored')
+    @delay = 0.25
+    @received_md = []
+  end
+
+  def an_rpc(req, call)
+    GRPC.logger.info("starting a slow #{@delay} rpc")
+    sleep @delay
+    @received_md << call.metadata unless call.metadata.nil?
+    req  # send back the req as the response
+  end
+end
+
+SlowStub = SlowService.rpc_stub_class
+
+describe GRPC::RpcServer do
+  RpcServer = GRPC::RpcServer
+  StatusCodes = GRPC::Core::StatusCodes
+
+  before(:each) do
+    @method = 'an_rpc_method'
+    @pass = 0
+    @fail = 1
+    @noop = proc { |x| x }
+
+    @server_queue = GRPC::Core::CompletionQueue.new
+    server_host = '0.0.0.0:0'
+    @server = GRPC::Core::Server.new(@server_queue, nil)
+    server_port = @server.add_http2_port(server_host, :this_port_is_insecure)
+    @host = "localhost:#{server_port}"
+    @ch = GRPC::Core::Channel.new(@host, nil, :this_channel_is_insecure)
+  end
+
+  describe '#new' do
+    it 'can be created with just some args' do
+      opts = { a_channel_arg: 'an_arg' }
+      blk = proc do
+        RpcServer.new(**opts)
+      end
+      expect(&blk).not_to raise_error
+    end
+
+    it 'can be created with a default deadline' do
+      opts = { a_channel_arg: 'an_arg', deadline: 5 }
+      blk = proc do
+        RpcServer.new(**opts)
+      end
+      expect(&blk).not_to raise_error
+    end
+
+    it 'can be created with a completion queue override' do
+      opts = {
+        a_channel_arg: 'an_arg',
+        completion_queue_override: @server_queue
+      }
+      blk = proc do
+        RpcServer.new(**opts)
+      end
+      expect(&blk).not_to raise_error
+    end
+
+    it 'cannot be created with a bad completion queue override' do
+      blk = proc do
+        opts = {
+          a_channel_arg: 'an_arg',
+          completion_queue_override: Object.new
+        }
+        RpcServer.new(**opts)
+      end
+      expect(&blk).to raise_error
+    end
+
+    it 'cannot be created with invalid ServerCredentials' do
+      blk = proc do
+        opts = {
+          a_channel_arg: 'an_arg',
+          creds: Object.new
+        }
+        RpcServer.new(**opts)
+      end
+      expect(&blk).to raise_error
+    end
+
+    it 'can be created with a server override' do
+      opts = { a_channel_arg: 'an_arg', server_override: @server }
+      blk = proc do
+        RpcServer.new(**opts)
+      end
+      expect(&blk).not_to raise_error
+    end
+
+    it 'cannot be created with a bad server override' do
+      blk = proc do
+        opts = {
+          a_channel_arg: 'an_arg',
+          server_override: Object.new
+        }
+        RpcServer.new(**opts)
+      end
+      expect(&blk).to raise_error
+    end
+  end
+
+  describe '#stopped?' do
+    before(:each) do
+      opts = { a_channel_arg: 'an_arg', poll_period: 1.5 }
+      @srv = RpcServer.new(**opts)
+    end
+
+    it 'starts out false' do
+      expect(@srv.stopped?).to be(false)
+    end
+
+    it 'stays false after the server starts running', server: true do
+      @srv.handle(EchoService)
+      t = Thread.new { @srv.run }
+      @srv.wait_till_running
+      expect(@srv.stopped?).to be(false)
+      @srv.stop
+      t.join
+    end
+
+    it 'is true after a running server is stopped', server: true do
+      @srv.handle(EchoService)
+      t = Thread.new { @srv.run }
+      @srv.wait_till_running
+      @srv.stop
+      t.join
+      expect(@srv.stopped?).to be(true)
+    end
+  end
+
+  describe '#running?' do
+    it 'starts out false' do
+      opts = { a_channel_arg: 'an_arg', server_override: @server }
+      r = RpcServer.new(**opts)
+      expect(r.running?).to be(false)
+    end
+
+    it 'is false if run is called with no services registered', server: true do
+      opts = {
+        a_channel_arg: 'an_arg',
+        poll_period: 2,
+        server_override: @server
+      }
+      r = RpcServer.new(**opts)
+      expect { r.run }.to raise_error(RuntimeError)
+    end
+
+    it 'is true after run is called with a registered service' do
+      opts = {
+        a_channel_arg: 'an_arg',
+        poll_period: 2.5,
+        server_override: @server
+      }
+      r = RpcServer.new(**opts)
+      r.handle(EchoService)
+      t = Thread.new { r.run }
+      r.wait_till_running
+      expect(r.running?).to be(true)
+      r.stop
+      t.join
+    end
+  end
+
+  describe '#handle' do
+    before(:each) do
+      @opts = { a_channel_arg: 'an_arg', poll_period: 1 }
+      @srv = RpcServer.new(**@opts)
+    end
+
+    it 'raises if #run has already been called' do
+      @srv.handle(EchoService)
+      t = Thread.new { @srv.run }
+      @srv.wait_till_running
+      expect { @srv.handle(EchoService) }.to raise_error
+      @srv.stop
+      t.join
+    end
+
+    it 'raises if the server has been run and stopped' do
+      @srv.handle(EchoService)
+      t = Thread.new { @srv.run }
+      @srv.wait_till_running
+      @srv.stop
+      t.join
+      expect { @srv.handle(EchoService) }.to raise_error
+    end
+
+    it 'raises if the service does not include GenericService ' do
+      expect { @srv.handle(Object) }.to raise_error
+    end
+
+    it 'raises if the service does not declare any rpc methods' do
+      expect { @srv.handle(EmptyService) }.to raise_error
+    end
+
+    it 'raises if the service does not define its rpc methods' do
+      expect { @srv.handle(NoRpcImplementation) }.to raise_error
+    end
+
+    it 'raises if a handler method is already registered' do
+      @srv.handle(EchoService)
+      expect { r.handle(EchoService) }.to raise_error
+    end
+  end
+
+  describe '#run' do
+    let(:client_opts) { { channel_override: @ch } }
+    let(:marshal) { EchoService.rpc_descs[:an_rpc].marshal_proc }
+    let(:unmarshal) { EchoService.rpc_descs[:an_rpc].unmarshal_proc(:output) }
+
+    context 'with no connect_metadata' do
+      before(:each) do
+        server_opts = {
+          server_override: @server,
+          completion_queue_override: @server_queue,
+          poll_period: 1
+        }
+        @srv = RpcServer.new(**server_opts)
+      end
+
+      it 'should return NOT_FOUND status on unknown methods', server: true do
+        @srv.handle(EchoService)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        blk = proc do
+          cq = GRPC::Core::CompletionQueue.new
+          stub = GRPC::ClientStub.new(@host, cq, :this_channel_is_insecure,
+                                      **client_opts)
+          stub.request_response('/unknown', req, marshal, unmarshal)
+        end
+        expect(&blk).to raise_error GRPC::BadStatus
+        @srv.stop
+        t.join
+      end
+
+      it 'should handle multiple sequential requests', server: true do
+        @srv.handle(EchoService)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        n = 5  # arbitrary
+        stub = EchoStub.new(@host, :this_channel_is_insecure, **client_opts)
+        n.times { expect(stub.an_rpc(req)).to be_a(EchoMsg) }
+        @srv.stop
+        t.join
+      end
+
+      it 'should receive metadata sent as rpc keyword args', server: true do
+        service = EchoService.new
+        @srv.handle(service)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        stub = EchoStub.new(@host, :this_channel_is_insecure, **client_opts)
+        expect(stub.an_rpc(req, k1: 'v1', k2: 'v2')).to be_a(EchoMsg)
+        wanted_md = [{ 'k1' => 'v1', 'k2' => 'v2' }]
+        check_md(wanted_md, service.received_md)
+        @srv.stop
+        t.join
+      end
+
+      it 'should receive metadata if a deadline is specified', server: true do
+        service = SlowService.new
+        @srv.handle(service)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        stub = SlowStub.new(@host, :this_channel_is_insecure, **client_opts)
+        timeout = service.delay + 1.0 # wait for long enough
+        resp = stub.an_rpc(req, timeout: timeout, k1: 'v1', k2: 'v2')
+        expect(resp).to be_a(EchoMsg)
+        wanted_md = [{ 'k1' => 'v1', 'k2' => 'v2' }]
+        check_md(wanted_md, service.received_md)
+        @srv.stop
+        t.join
+      end
+
+      it 'should handle cancellation correctly', server: true do
+        service = SlowService.new
+        @srv.handle(service)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        stub = SlowStub.new(@host, :this_channel_is_insecure, **client_opts)
+        op = stub.an_rpc(req, k1: 'v1', k2: 'v2', return_op: true)
+        Thread.new do  # cancel the call
+          sleep 0.1
+          op.cancel
+        end
+        expect { op.execute }.to raise_error GRPC::Cancelled
+        @srv.stop
+        t.join
+      end
+
+      it 'should handle multiple parallel requests', server: true do
+        @srv.handle(EchoService)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req, q = EchoMsg.new, Queue.new
+        n = 5  # arbitrary
+        threads = [t]
+        n.times do
+          threads << Thread.new do
+            stub = EchoStub.new(@host, :this_channel_is_insecure, **client_opts)
+            q << stub.an_rpc(req)
+          end
+        end
+        n.times { expect(q.pop).to be_a(EchoMsg) }
+        @srv.stop
+        threads.each(&:join)
+      end
+
+      it 'should return UNAVAILABLE on too many jobs', server: true do
+        opts = {
+          a_channel_arg: 'an_arg',
+          server_override: @server,
+          completion_queue_override: @server_queue,
+          pool_size: 1,
+          poll_period: 1,
+          max_waiting_requests: 0
+        }
+        alt_srv = RpcServer.new(**opts)
+        alt_srv.handle(SlowService)
+        t = Thread.new { alt_srv.run }
+        alt_srv.wait_till_running
+        req = EchoMsg.new
+        n = 5  # arbitrary, use as many to ensure the server pool is exceeded
+        threads = []
+        one_failed_as_unavailable = false
+        n.times do
+          threads << Thread.new do
+            stub = SlowStub.new(@host, :this_channel_is_insecure, **client_opts)
+            begin
+              stub.an_rpc(req)
+            rescue GRPC::BadStatus => e
+              one_failed_as_unavailable = e.code == StatusCodes::UNAVAILABLE
+            end
+          end
+        end
+        threads.each(&:join)
+        alt_srv.stop
+        t.join
+        expect(one_failed_as_unavailable).to be(true)
+      end
+    end
+
+    context 'with connect metadata' do
+      let(:test_md_proc) do
+        proc do |mth, md|
+          res = md.clone
+          res['method'] = mth
+          res['connect_k1'] = 'connect_v1'
+          res
+        end
+      end
+      before(:each) do
+        server_opts = {
+          server_override: @server,
+          completion_queue_override: @server_queue,
+          poll_period: 1,
+          connect_md_proc: test_md_proc
+        }
+        @srv = RpcServer.new(**server_opts)
+      end
+
+      it 'should send connect metadata to the client', server: true do
+        service = EchoService.new
+        @srv.handle(service)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        stub = EchoStub.new(@host, :this_channel_is_insecure, **client_opts)
+        op = stub.an_rpc(req, k1: 'v1', k2: 'v2', return_op: true)
+        expect(op.metadata).to be nil
+        expect(op.execute).to be_a(EchoMsg)
+        wanted_md = {
+          'k1' => 'v1',
+          'k2' => 'v2',
+          'method' => '/EchoService/an_rpc',
+          'connect_k1' => 'connect_v1'
+        }
+        wanted_md.each do |key, value|
+          expect(op.metadata[key]).to eq(value)
+        end
+        @srv.stop
+        t.join
+      end
+    end
+
+    context 'with trailing metadata' do
+      before(:each) do
+        server_opts = {
+          server_override: @server,
+          completion_queue_override: @server_queue,
+          poll_period: 1
+        }
+        @srv = RpcServer.new(**server_opts)
+      end
+
+      it 'should be added to BadStatus when requests fail', server: true do
+        service = FailingService.new
+        @srv.handle(service)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        stub = FailingStub.new(@host, :this_channel_is_insecure, **client_opts)
+        blk = proc { stub.an_rpc(req) }
+
+        # confirm it raise the expected error
+        expect(&blk).to raise_error GRPC::BadStatus
+
+        # call again and confirm exception contained the trailing metadata.
+        begin
+          blk.call
+        rescue GRPC::BadStatus => e
+          expect(e.code).to eq(service.code)
+          expect(e.details).to eq(service.details)
+          expect(e.metadata).to eq(service.md)
+        end
+        @srv.stop
+        t.join
+      end
+
+      it 'should be received by the client', server: true do
+        wanted_trailers = { 'k1' => 'out_v1', 'k2' => 'out_v2' }
+        service = EchoService.new(k1: 'out_v1', k2: 'out_v2')
+        @srv.handle(service)
+        t = Thread.new { @srv.run }
+        @srv.wait_till_running
+        req = EchoMsg.new
+        stub = EchoStub.new(@host, :this_channel_is_insecure, **client_opts)
+        op = stub.an_rpc(req, k1: 'v1', k2: 'v2', return_op: true)
+        expect(op.metadata).to be nil
+        expect(op.execute).to be_a(EchoMsg)
+        expect(op.metadata).to eq(wanted_trailers)
+        @srv.stop
+        t.join
+      end
+    end
+  end
+end