feat(logging): setup min log level, log dir and set file mode to log files

Author: lotem

src/rime/setup.cc

@@ -33,10 +33,20 @@ RIME_API void LoadModules(const char* module_names[]) {
   }
 }
 
-RIME_API void SetupLogging(const char* app_name) {
+RIME_API void SetupLogging(const char* app_name, int min_log_level, const char* log_dir) {
 #ifdef RIME_ENABLE_LOGGING
+  FLAGS_minloglevel = min_log_level;
+  if (log_dir) {
+    FLAGS_log_dir = log_dir;
+  }
+  // Do not allow other users to read/write log files created by current process.
+  FLAGS_logfile_mode = 0600;
   google::InitGoogleLogging(app_name);
 #endif  // RIME_ENABLE_LOGGING
 }
 
+RIME_API void SetupLogging(const char* app_name) {
+  SetupLogging(app_name, 0, NULL);
+}
+
 }  // namespace rime

src/rime/setup.h

@@ -17,6 +17,7 @@ extern const char* kLegacyModules[];
 
 RIME_API void LoadModules(const char* module_names[]);
 
+RIME_API void SetupLogging(const char* app_name, int min_log_level, const char* log_dir);
 RIME_API void SetupLogging(const char* app_name);
 
 }  // namespace rime

src/rime_api.cc

@@ -68,7 +68,7 @@ RIME_API void RimeSetup(RimeTraits *traits) {
 
   setup_deployer(traits);
   if (PROVIDED(traits, app_name)) {
-    SetupLogging(traits->app_name);
+    SetupLogging(traits->app_name, traits->min_log_level, traits->log_dir);
   }
 }
 

src/rime_api.h

@@ -77,6 +77,16 @@ typedef struct rime_traits_t {
 
   //! A list of modules to load before initializing
   const char** modules;
+  // v1.6
+  /*! Minimal level of logged messages.
+   *  Value is passed to Glog library using FLAGS_minloglevel variable.
+   *  0 = INFO (default), 1 = WARNING, 2 = ERROR, 3 = FATAL
+   */
+  int min_log_level;
+  /*! Directory of log files.
+   *  Value is passed to Glog library using FLAGS_log_dir variable.
+   */
+  const char* log_dir;
 } RimeTraits;
 
 typedef struct {