feat: add --dlog= option

docs/internal-api.md

@@ -6,6 +6,16 @@ These flags and variables are for LWNode.js core development usage only. Do not
 
 ### Flags
 
+#### `--dlog=<DLOG Tag>`
+
+If the `--dlog` flag is specified on Tizen, LWNode prints logs via `DLOG` when
+running from an embedder or the terminal. `DLOG_TAG` must be given, and is used
+as the output TAG for loggers like `console.log()`.
+
+```shell
+--dlog=JS_APP
+```
+
 #### `--internal-log`
 
 If the `--internal-log` flag is specified or the `LWNODE_INTERNAL_LOG` environment variable is set to 1, LWNode will print internal logs in release build.

src/api/engine.cc

@@ -373,6 +373,29 @@ void Engine::initialize() {
     registerGCEventListeners();
   }
 
+#if defined(HOST_TIZEN)
+  if (EscargotShim::Global::flags()->isOn(
+          EscargotShim::Flag::Type::DlogOutput)) {
+    Flag* flag = EscargotShim::Global::flags()->getFlag(
+        EscargotShim::Flag::Type::DlogOutput);
+
+    std::string user_tag = flag->getValue();
+    if (!user_tag.empty()) {
+      LogKind::user()->tag = user_tag;
+    }
+
+    LogOption::setDefaultOutputInstantiator([]() {
+      static thread_local std::shared_ptr<Logger::Output> s_loggerOutput;
+      if (s_loggerOutput == nullptr) {
+        s_loggerOutput = std::static_pointer_cast<Logger::Output>(
+            std::make_shared<DlogOut>());
+      }
+      return s_loggerOutput;
+    });
+    LWNODE_DEV_LOG("DEV_LOG: OK");
+  }
+#endif
+
   mainThreadId_ = std::this_thread::get_id();
 }
 

src/api/utils/logger/flags.cc

@@ -46,6 +46,7 @@ void Flags::initFlags() {
   addFlag<FlagWithNegativeValues>("--trace-call=", Flag::Type::TraceCall, true);
   addFlag<Flag>("--internal-log", Flag::Type::InternalLog);
   addFlag<Flag>("--start-debug-server", Flag::Type::DebugServer);
+  addFlag<FlagWithValues>("--dlog=", Flag::Type::DlogOutput, true);
 }
 
 bool Flag::isPrefixOf(const std::string& name) {
@@ -92,7 +93,8 @@ void Flags::add(const std::string& userOption) {
   add(flag);
 
   if (flag->type() == Flag::Type::TraceCall ||
-      flag->type() == Flag::Type::UnhandledRejections) {
+      flag->type() == Flag::Type::UnhandledRejections ||
+      flag->type() == Flag::Type::DlogOutput) {
     std::string optionValues = userOption.substr(userOption.find_first_of('=') +
                                                  1);  // +1 for skipping '='
     auto tokens = strSplit(optionValues, ',');

src/api/utils/logger/flags.h

@@ -49,6 +49,7 @@ class Flag {
     InternalLog,
     LWNodeOther,
     DebugServer,
+    DlogOutput,
   };
 
   Flag(const std::string& name, Type type, bool useAsPrefix = false)
@@ -61,6 +62,7 @@ class Flag {
 
   virtual void addValue(const std::string& value){};
   virtual bool hasValue(const std::string& value) { return false; }
+  virtual std::string getValue() { return ""; }
 
   virtual void addNegativeValue(const std::string& value) {}
   virtual bool hasNegativeValue(const std::string& value) { return false; }
@@ -85,6 +87,14 @@ class FlagWithValues : public Flag {
     return values_.find(value) != values_.end();
   }
 
+  virtual std::string getValue() override {
+    if (!values_.empty()) {
+      auto iter = values_.begin();
+      return *iter;
+    }
+    return "";
+  }
+
  private:
   std::set<std::string> values_;
 };
@@ -131,13 +141,13 @@ class LWNODE_EXPORT Flags {
   std::set<Flag*, FlagComparator> get() { return flags_; };
   void set(std::set<Flag*, FlagComparator> flags) { flags_ = flags; }
 
+  Flag* getFlag(Flag::Type type);
+
  private:
   void initFlags();
   Flag* findFlagObject(const std::string& name);
   Flag* findFlagObject(Flag::Type type);
 
-  Flag* getFlag(Flag::Type type);
-
   template <class T>
   void addFlag(const char* name, Flag::Type type, bool useAsPrefix = false) {
     validFlags_.push_back(std::make_unique<T>(name, type, useAsPrefix));