printf has already a way to pad spaces. If we use it, we can avoid accidentally adding extra logs because we did srslte::logmap::get("MAC") instead of srslte::logmap::get("MAC ")

lib/include/srslte/common/logmap.h

@@ -60,8 +60,6 @@ private:
 
 class logmap : public singleton_t<logmap>
 {
-  static const size_t servicename_minimum_length = 4;
-
 public:
   // Access to log map by servicename. If servicename does not exist, create a new log_filter with default cfg
   // Access to the map is protected by a mutex

lib/include/srslte/common/test_common.h

@@ -159,16 +159,16 @@ public:
   {
     std::unique_ptr<Log> l{new Log{std::forward<Args>(args)...}};
     // store previous log, and register the newly created one
-    prev_log    = srslte::logmap::get_instance()->deregister_log(l->get_service_name());
+    prev_log    = srslte::logmap::deregister_log(l->get_service_name());
     current_log = l.get();
-    srslte::logmap::get_instance()->register_log(std::move(l));
+    srslte::logmap::register_log(std::move(l));
   }
   scoped_log(scoped_log<Log>&&) noexcept = default;
   ~scoped_log()
   {
-    srslte::logmap::get_instance()->deregister_log(current_log->get_service_name());
+    srslte::logmap::deregister_log(current_log->get_service_name());
     if (prev_log != nullptr) {
-      srslte::logmap::get_instance()->register_log(std::move(prev_log));
+      srslte::logmap::register_log(std::move(prev_log));
     }
   }
 

lib/src/common/log_filter.cc

@@ -65,6 +65,11 @@ log_filter::log_filter(std::string layer, logger* logger_, bool tti) : log()
 
 void log_filter::init(std::string layer, logger* logger_, bool tti)
 {
+  // strip trailing white spaces
+  size_t last_char_pos = layer.find_last_not_of(' ');
+  if (last_char_pos != layer.size() - 1) {
+    layer.erase(last_char_pos + 1, layer.size());
+  }
   service_name = std::move(layer);
   logger_h     = logger_;
   do_tti       = tti;
@@ -99,7 +104,7 @@ void log_filter::all_log(srslte::LOG_LEVEL_ENUM level,
 
       snprintf(log_str->str(),
                log_str->get_buffer_size(),
-               "%s [%s] %s %s%s%s%s%s",
+               "%s [%-4s] %s %s%s%s%s%s",
                buffer_time,
                get_service_name().c_str(),
                log_level_text_short[level],

lib/src/common/logmap.cc

@@ -40,9 +40,10 @@ logmap::logmap() : logger_stdout_val(new logger_stdout{})
 log_ref SRSLTE_EXPORT logmap::get(std::string servicename)
 {
   logmap* pool = get_instance();
-  if (servicename.size() < servicename_minimum_length) {
-    // pad right of string with spaces
-    servicename.insert(servicename.end(), servicename_minimum_length - servicename.length(), ' ');
+  // strip trailing white spaces
+  size_t last_char_pos = servicename.find_last_not_of(' ');
+  if (last_char_pos != servicename.size() - 1) {
+    servicename.erase(last_char_pos + 1, servicename.size());
   }
   return pool->get_impl(std::move(servicename));
 }

lib/test/common/log_filter_test.cc

@@ -166,6 +166,21 @@ int test_log_singleton()
   return SRSLTE_SUCCESS;
 }
 
+int test_log_ref()
+{
+  // Check if trailing whitespaces are correctly removed
+  srslte::log_ref t1_log{"T1"};
+  TESTASSERT(t1_log->get_service_name() == "T1");
+  TESTASSERT(t1_log.get() == srslte::logmap::get("T1").get());
+  TESTASSERT(t1_log.get() == srslte::logmap::get("T1  ").get());
+  {
+    scoped_log<srslte::nullsink_log> null_log{"T2"};
+    TESTASSERT(null_log->get_service_name() == "T2");
+  }
+
+  return SRSLTE_SUCCESS;
+}
+
 int full_test()
 {
   bool        result;
@@ -191,6 +206,7 @@ int main(int argc, char** argv)
   TESTASSERT(basic_hex_test() == SRSLTE_SUCCESS);
   TESTASSERT(full_test() == SRSLTE_SUCCESS);
   TESTASSERT(test_log_singleton() == SRSLTE_SUCCESS);
+  TESTASSERT(test_log_ref() == SRSLTE_SUCCESS);
 
   return SRSLTE_SUCCESS;
 }

srsue/hdr/stack/ue_stack_lte.h

@@ -149,14 +149,14 @@ private:
 
   // UE stack logging
   srslte::logger* logger = nullptr;
-  srslte::log_ref stack_log; ///< our own log filter
-  srslte::log_ref mac_log;
-  srslte::log_ref rlc_log;
-  srslte::log_ref pdcp_log;
-  srslte::log_ref rrc_log;
-  srslte::log_ref usim_log;
-  srslte::log_ref nas_log;
-  srslte::log_ref pool_log;
+  srslte::log_ref stack_log{"STCK"}; ///< our own log filter
+  srslte::log_ref mac_log{"MAC"};
+  srslte::log_ref rlc_log{"RLC"};
+  srslte::log_ref pdcp_log{"PDCP"};
+  srslte::log_ref rrc_log{"RRC"};
+  srslte::log_ref usim_log{"USIM"};
+  srslte::log_ref nas_log{"NAS"};
+  srslte::log_ref pool_log{"POOL"};
 
   // stack components
   srsue::mac                 mac;

srsue/src/stack/ue_stack_lte.cc

@@ -35,14 +35,6 @@ ue_stack_lte::ue_stack_lte() :
   running(false),
   args(),
   logger(nullptr),
-  stack_log("STCK"),
-  pool_log("POOL"),
-  mac_log("MAC "),
-  rlc_log("RLC "),
-  pdcp_log("PDCP"),
-  rrc_log("RRC "),
-  usim_log("USIM"),
-  nas_log("NAS "),
   usim(nullptr),
   phy(nullptr),
   rlc(rlc_log.get()),
@@ -96,11 +88,11 @@ int ue_stack_lte::init(const stack_args_t& args_, srslte::logger* logger_)
 
   // init own log
   stack_log->set_level(srslte::LOG_LEVEL_INFO);
-  pool_log->set_level(srslte::LOG_LEVEL_ERROR);
+  pool_log->set_level(srslte::LOG_LEVEL_WARNING);
   byte_buffer_pool::get_instance()->set_log(pool_log.get());
 
   // init layer logs
-  srslte::logmap::register_log(std::unique_ptr<srslte::log>{new srslte::log_filter{"MAC ", logger, true}});
+  srslte::logmap::register_log(std::unique_ptr<srslte::log>{new srslte::log_filter{"MAC", logger, true}});
   mac_log->set_level(args.log.mac_level);
   mac_log->set_hex_limit(args.log.mac_hex_limit);
   rlc_log->set_level(args.log.rlc_level);