fix an issue that node sockets can be duplicated

common/util_algorithm.hh

@@ -7,14 +7,17 @@
 namespace nf7::util {
 
 template <typename T>
-inline void Uniq(std::vector<T>& v) noexcept {
+inline size_t Uniq(std::vector<T>& v) noexcept {
+  size_t n = 0;
   for (auto itr = v.begin(); itr < v.end();) {
     if (v.end() != std::find(itr+1, v.end(), *itr)) {
       itr = v.erase(itr);
+      ++n;
     } else {
       ++itr;
     }
   }
+  return n;
 }
 
 }  // namespace nf7::util

file/luajit_inline_node.cc

@@ -267,6 +267,14 @@ try {
   auto new_inputs  = yaml["inputs"] .as<std::vector<std::string>>();
   auto new_outputs = yaml["outputs"].as<std::vector<std::string>>();
   auto new_script  = yaml["script"].as<std::string>();
+
+  if (nf7::util::Uniq(new_inputs) > 0) {
+    throw nf7::Exception {"duplicated inputs"};
+  }
+  if (nf7::util::Uniq(new_outputs) > 0) {
+    throw nf7::Exception {"duplicated outputs"};
+  }
+
   inputs  = std::move(new_inputs);
   outputs = std::move(new_outputs);
   script  = std::move(new_script);

file/luajit_node.cc

@@ -35,6 +35,7 @@
 #include "common/nfile_watcher.hh"
 #include "common/node.hh"
 #include "common/ptr_selector.hh"
+#include "common/util_algorithm.hh"
 #include "common/yas_std_filesystem.hh"
 
 
@@ -232,10 +233,16 @@ nf7::Future<std::shared_ptr<LuaNode::Meta>> LuaNode::Build() noexcept {
 
       lua_getfield(L, 1, "inputs");
       nf7::luajit::ToStringList(L, ret->inputs, -1);
+      if (nf7::util::Uniq(ret->inputs) > 0) {
+        throw nf7::Exception {"duplicated inputs"};
+      }
       lua_pop(L, 1);
 
       lua_getfield(L, 1, "outputs");
       nf7::luajit::ToStringList(L, ret->outputs, -1);
+      if (nf7::util::Uniq(ret->outputs)) {
+        throw nf7::Exception {"duplicated outputs"};
+      }
       lua_pop(L, 1);
 
       lua_getfield(L, 1, "lambda");