nghttpx: Add mruby env.server_addr and env.tls_used attributes

doc/nghttpx.h2r

@@ -265,13 +265,25 @@ respectively.
 
     .. rb:attr_reader:: remote_addr
 
-        Return IP address of a remote client.
+        Return IP address of a remote client.  If connection is made
+        via UNIX domain socket, this returns the string "localhost".
+
+    .. rb:attr_reader:: server_addr
+
+        Return address of server that accepted the connection.  This
+	is a string which specified in :option:`--frontend` option,
+	excluding port number, and not a resolved IP address.  For
+	UNIX domain socket, this is a path to UNIX domain socket.
 
     .. rb:attr_reader:: server_port
 
         Return port number of the server frontend which accepted the
         connection from client.
 
+    .. rb:attr_reader:: tls_used
+
+        Return true if TLS is used on the connection.
+
 .. rb:class:: Request
 
     Object to represent request from client.  The modification to

src/shrpx_mruby_module_env.cc

@@ -104,6 +104,29 @@ mrb_value env_get_server_port(mrb_state *mrb, mrb_value self) {
 }
 } // namespace
 
+namespace {
+mrb_value env_get_server_addr(mrb_state *mrb, mrb_value self) {
+  auto data = static_cast<MRubyAssocData *>(mrb->ud);
+  auto downstream = data->downstream;
+  auto upstream = downstream->get_upstream();
+  auto handler = upstream->get_client_handler();
+  auto faddr = handler->get_upstream_addr();
+
+  return mrb_str_new(mrb, faddr->host.c_str(), faddr->host.size());
+}
+} // namespace
+
+namespace {
+mrb_value env_get_tls_used(mrb_state *mrb, mrb_value self) {
+  auto data = static_cast<MRubyAssocData *>(mrb->ud);
+  auto downstream = data->downstream;
+  auto upstream = downstream->get_upstream();
+  auto handler = upstream->get_client_handler();
+
+  return handler->get_ssl() ? mrb_true_value() : mrb_false_value();
+}
+} // namespace
+
 void init_env_class(mrb_state *mrb, RClass *module) {
   auto env_class =
       mrb_define_class_under(mrb, module, "Env", mrb->object_class);
@@ -115,8 +138,12 @@ void init_env_class(mrb_state *mrb, RClass *module) {
   mrb_define_method(mrb, env_class, "phase", env_get_phase, MRB_ARGS_NONE());
   mrb_define_method(mrb, env_class, "remote_addr", env_get_remote_addr,
                     MRB_ARGS_NONE());
+  mrb_define_method(mrb, env_class, "server_addr", env_get_server_addr,
+                    MRB_ARGS_NONE());
   mrb_define_method(mrb, env_class, "server_port", env_get_server_port,
                     MRB_ARGS_NONE());
+  mrb_define_method(mrb, env_class, "tls_used", env_get_tls_used,
+                    MRB_ARGS_NONE());
 }
 
 } // namespace mruby