Fix global log handle symbols when using dlopen (#1420)

.gitattributes

@@ -41,3 +41,7 @@ LICENSE*                text
 ## git files
 .gitignore              text eol=lf
 .gitattributes          text eol=lf
+
+## bazel files
+WORKSPACE               text eol=lf
+BUILD                   text eol=lf

exporters/jaeger/BUILD

@@ -180,6 +180,7 @@ cc_library(
     tags = ["jaeger"],
     deps = [
         ":jaeger_exporter",
+        "//sdk/src/common:global_log_handler",
     ],
 )
 

sdk/include/opentelemetry/sdk/common/global_log_handler.h

@@ -55,7 +55,7 @@ inline std::string LevelToString(LogLevel level)
 class LogHandler
 {
 public:
-  virtual ~LogHandler() = default;
+  virtual ~LogHandler();
 
   virtual void Handle(LogLevel level,
                       const char *file,
@@ -71,22 +71,7 @@ class DefaultLogHandler : public LogHandler
               const char *file,
               int line,
               const char *msg,
-              const sdk::common::AttributeMap &attributes) noexcept override
-  {
-    std::stringstream output_s;
-    output_s << "[" << LevelToString(level) << "] ";
-    if (file != nullptr)
-    {
-      output_s << "File: " << file << ":" << line;
-    }
-    if (msg != nullptr)
-    {
-      output_s << msg;
-    }
-    output_s << std::endl;
-    // TBD - print attributes
-    std::cout << output_s.str();  // thread safe.
-  }
+              const sdk::common::AttributeMap &attributes) noexcept override;
 };
 
 class NoopLogHandler : public LogHandler
@@ -96,10 +81,7 @@ class NoopLogHandler : public LogHandler
               const char *file,
               int line,
               const char *msg,
-              const sdk::common::AttributeMap &error_attributes) noexcept override
-  {
-    // ignore the log message
-  }
+              const sdk::common::AttributeMap &error_attributes) noexcept override;
 };
 
 /**
@@ -113,7 +95,7 @@ class GlobalLogHandler
    *
    * By default, a default LogHandler is returned.
    */
-  static const nostd::shared_ptr<LogHandler> &GetLogHandler() noexcept
+  static inline const nostd::shared_ptr<LogHandler> &GetLogHandler() noexcept
   {
     return GetHandlerAndLevel().first;
   }
@@ -123,7 +105,7 @@ class GlobalLogHandler
    * This should be called once at the start of application before creating any Provider
    * instance.
    */
-  static void SetLogHandler(nostd::shared_ptr<LogHandler> eh) noexcept
+  static inline void SetLogHandler(nostd::shared_ptr<LogHandler> eh) noexcept
   {
     GetHandlerAndLevel().first = eh;
   }
@@ -133,22 +115,17 @@ class GlobalLogHandler
    *
    * By default, a default log level is returned.
    */
-  static LogLevel GetLogLevel() noexcept { return GetHandlerAndLevel().second; }
+  static inline LogLevel GetLogLevel() noexcept { return GetHandlerAndLevel().second; }
 
   /**
    * Changes the singleton Log level.
    * This should be called once at the start of application before creating any Provider
    * instance.
    */
-  static void SetLogLevel(LogLevel level) noexcept { GetHandlerAndLevel().second = level; }
+  static inline void SetLogLevel(LogLevel level) noexcept { GetHandlerAndLevel().second = level; }
 
 private:
-  static std::pair<nostd::shared_ptr<LogHandler>, LogLevel> &GetHandlerAndLevel() noexcept
-  {
-    static std::pair<nostd::shared_ptr<LogHandler>, LogLevel> handler_and_level{
-        nostd::shared_ptr<LogHandler>(new DefaultLogHandler), LogLevel::Warning};
-    return handler_and_level;
-  }
+  static std::pair<nostd::shared_ptr<LogHandler>, LogLevel> &GetHandlerAndLevel() noexcept;
 };
 
 }  // namespace internal_log

sdk/src/common/BUILD

@@ -27,6 +27,18 @@ cc_library(
     include_prefix = "src/common",
     deps = [
         "//api",
+        "//sdk:headers",
         "//sdk/src/common/platform:fork",
     ],
 )
+
+cc_library(
+    name = "global_log_handler",
+    srcs = [
+        "global_log_handler.cc",
+    ],
+    deps = [
+        "//api",
+        "//sdk:headers",
+    ],
+)

sdk/src/common/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(COMMON_SRCS random.cc core.cc)
+set(COMMON_SRCS random.cc core.cc global_log_handler.cc)
 if(WIN32)
   list(APPEND COMMON_SRCS platform/fork_windows.cc)
 else()

sdk/src/common/global_log_handler.cc

@@ -0,0 +1,57 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#include "opentelemetry/sdk/common/global_log_handler.h"
+
+#include <cstring>
+#include <random>
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace sdk
+{
+namespace common
+{
+namespace internal_log
+{
+
+LogHandler::~LogHandler() {}
+
+void DefaultLogHandler::Handle(LogLevel level,
+                               const char *file,
+                               int line,
+                               const char *msg,
+                               const sdk::common::AttributeMap &attributes) noexcept
+{
+  std::stringstream output_s;
+  output_s << "[" << LevelToString(level) << "] ";
+  if (file != nullptr)
+  {
+    output_s << "File: " << file << ":" << line;
+  }
+  if (msg != nullptr)
+  {
+    output_s << msg;
+  }
+  output_s << std::endl;
+  // TBD - print attributes
+  std::cout << output_s.str();  // thread safe.
+}
+
+void NoopLogHandler::Handle(LogLevel,
+                            const char *,
+                            int,
+                            const char *,
+                            const sdk::common::AttributeMap &) noexcept
+{}
+
+std::pair<nostd::shared_ptr<LogHandler>, LogLevel> &GlobalLogHandler::GetHandlerAndLevel() noexcept
+{
+  static std::pair<nostd::shared_ptr<LogHandler>, LogLevel> handler_and_level{
+      nostd::shared_ptr<LogHandler>(new DefaultLogHandler), LogLevel::Warning};
+  return handler_and_level;
+}
+
+}  // namespace internal_log
+}  // namespace common
+}  // namespace sdk
+OPENTELEMETRY_END_NAMESPACE

sdk/src/logs/BUILD

@@ -22,6 +22,7 @@ cc_library(
     deps = [
         "//api",
         "//sdk:headers",
+        "//sdk/src/common:global_log_handler",
         "//sdk/src/resource",
     ],
 )

sdk/src/metrics/BUILD

@@ -22,6 +22,7 @@ cc_library(
     deps = [
         "//api",
         "//sdk:headers",
+        "//sdk/src/common:global_log_handler",
         "//sdk/src/resource",
     ],
 )

sdk/src/trace/BUILD

@@ -22,6 +22,7 @@ cc_library(
     deps = [
         "//api",
         "//sdk:headers",
+        "//sdk/src/common:global_log_handler",
         "//sdk/src/common:random",
         "//sdk/src/resource",
     ],

sdk/test/common/BUILD

@@ -124,6 +124,7 @@ cc_test(
     deps = [
         "//api",
         "//sdk:headers",
+        "//sdk/src/common:global_log_handler",
         "@com_google_googletest//:gtest_main",
     ],
 )