[SDK] Fix GetLogger with empty library name (#2398)

CHANGELOG.md

@@ -25,6 +25,8 @@ Increment the:
   [#2385](https://github.com/open-telemetry/opentelemetry-cpp/pull/2385)
 * [API] Add a new AddLink() operation to Span
   [#2380](https://github.com/open-telemetry/opentelemetry-cpp/pull/2380)
+* [SDK] Fix GetLogger with empty library
+  name[#2398](https://github.com/open-telemetry/opentelemetry-cpp/pull/2398)
 
 Important changes:
 

sdk/src/logs/logger_provider.cc

@@ -57,6 +57,12 @@ nostd::shared_ptr<opentelemetry::logs::Logger> LoggerProvider::GetLogger(
     nostd::string_view schema_url,
     const opentelemetry::common::KeyValueIterable &attributes) noexcept
 {
+  // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/data-model.md#field-instrumentationscope
+  if (library_name.empty())
+  {
+    library_name = logger_name;
+  }
+
   // Ensure only one thread can read/write from the map of loggers
   std::lock_guard<std::mutex> lock_guard{lock_};
 
@@ -84,18 +90,9 @@ nostd::shared_ptr<opentelemetry::logs::Logger> LoggerProvider::GetLogger(
   }
   */
 
-  // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/data-model.md#field-instrumentationscope
-  std::unique_ptr<instrumentationscope::InstrumentationScope> lib;
-  if (library_name.empty())
-  {
-    lib = instrumentationscope::InstrumentationScope::Create(logger_name, library_version,
-                                                             schema_url, attributes);
-  }
-  else
-  {
-    lib = instrumentationscope::InstrumentationScope::Create(library_name, library_version,
-                                                             schema_url, attributes);
-  }
+  std::unique_ptr<instrumentationscope::InstrumentationScope> lib =
+      instrumentationscope::InstrumentationScope::Create(library_name, library_version, schema_url,
+                                                         attributes);
 
   loggers_.push_back(std::shared_ptr<opentelemetry::sdk::logs::Logger>(
       new Logger(logger_name, context_, std::move(lib))));

sdk/test/logs/logger_provider_sdk_test.cc

@@ -111,6 +111,20 @@ TEST(LoggerProviderSDK, EventLoggerProviderFactory)
   auto event_logger = elp->CreateEventLogger(logger1, "otel-cpp.test");
 }
 
+TEST(LoggerPviderSDK, LoggerEquityCheck)
+{
+  auto lp = std::shared_ptr<logs_api::LoggerProvider>(new LoggerProvider());
+  nostd::string_view schema_url{"https://opentelemetry.io/schemas/1.11.0"};
+
+  auto logger1 = lp->GetLogger("logger1", "opentelelemtry_library", "", schema_url);
+  auto logger2 = lp->GetLogger("logger1", "opentelelemtry_library", "", schema_url);
+  EXPECT_EQ(logger1, logger2);
+
+  auto logger3         = lp->GetLogger("logger3");
+  auto another_logger3 = lp->GetLogger("logger3");
+  EXPECT_EQ(logger3, another_logger3);
+}
+
 class DummyLogRecordable final : public opentelemetry::sdk::logs::Recordable
 {
 public: