Merge pull request #2888 from tbetbetbe/grpc-ruby-user-null-for-default-host

Use null for default host

src/ruby/ext/grpc/rb_channel.c

@@ -203,7 +203,10 @@ static VALUE grpc_rb_channel_create_call(VALUE self, VALUE cqueue, VALUE method,
   grpc_channel *ch = NULL;
   grpc_completion_queue *cq = NULL;
   char *method_chars = StringValueCStr(method);
-  char *host_chars = StringValueCStr(host);
+  char *host_chars = NULL;
+  if (host != Qnil) {
+    host_chars = StringValueCStr(host);
+  }
 
   cq = grpc_rb_get_wrapped_completion_queue(cqueue);
   TypedData_Get_Struct(self, grpc_rb_channel, &grpc_channel_data_type, wrapper);

src/ruby/lib/grpc/generic/client_stub.rb

@@ -410,7 +410,7 @@ module GRPC
     # @param timeout [TimeConst]
     def new_active_call(method, marshal, unmarshal, timeout = nil)
       deadline = from_relative_time(timeout.nil? ? @timeout : timeout)
-      call = @ch.create_call(@queue, method, @host, deadline)
+      call = @ch.create_call(@queue, method, nil, deadline)
       ActiveCall.new(call, @queue, marshal, unmarshal, deadline, started: false)
     end
   end

src/ruby/spec/call_spec.rb

@@ -137,7 +137,7 @@ describe GRPC::Core::Call do
   end
 
   def make_test_call
-    @ch.create_call(client_queue, 'dummy_method', 'dummy_host', deadline)
+    @ch.create_call(client_queue, 'dummy_method', nil, deadline)
   end
 
   def deadline

src/ruby/spec/channel_spec.rb

@@ -117,7 +117,7 @@ describe GRPC::Core::Channel do
       deadline = Time.now + 5
 
       blk = proc do
-        ch.create_call(cq, 'dummy_method', 'dummy_host', deadline)
+        ch.create_call(cq, 'dummy_method', nil, deadline)
       end
       expect(&blk).to_not raise_error
     end
@@ -128,7 +128,7 @@ describe GRPC::Core::Channel do
 
       deadline = Time.now + 5
       blk = proc do
-        ch.create_call(cq, 'dummy_method', 'dummy_host', deadline)
+        ch.create_call(cq, 'dummy_method', nil, deadline)
       end
       expect(&blk).to raise_error(RuntimeError)
     end

src/ruby/spec/client_server_spec.rb

@@ -61,7 +61,7 @@ shared_context 'setup: tags' do
   end
 
   def new_client_call
-    @ch.create_call(@client_queue, '/method', 'foo.test.google.fr', deadline)
+    @ch.create_call(@client_queue, '/method', nil, deadline)
   end
 end
 

src/ruby/spec/generic/active_call_spec.rb

@@ -338,7 +338,7 @@ describe GRPC::ActiveCall do
   end
 
   def make_test_call
-    @ch.create_call(@client_queue, '/method', 'a.dummy.host', deadline)
+    @ch.create_call(@client_queue, '/method', nil, deadline)
   end
 
   def deadline