include the otel header-only part directly for ease of use

2025-12-23 10:30:30 -08:00 · 2025-07-11 13:12:13 -07:00 · 2025-07-11 13:12:13 -07:00 · 7f835b414a
commit 7f835b414a
parent 8895ad182f
241 changed files with 49967 additions and 3 deletions
--- a/ext/opentelemetry-cpp-api-only/include/opentelemetry/plugin/hook.h
+++ b/ext/opentelemetry-cpp-api-only/include/opentelemetry/plugin/hook.h
@ -0,0 +1,51 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "opentelemetry/nostd/unique_ptr.h"
+#include "opentelemetry/version.h"
+
+#ifdef _WIN32
+
+/**
+ * Cross-platform helper macro to declare the symbol used to load an OpenTelemetry implementation
+ * as a plugin.
+ *
+ * Note: The symbols use weak linkage so as to support using an OpenTelemetry both as a regular
+ * library and a dynamically loaded plugin. The weak linkage allows for multiple implementations to
+ * be linked in without getting multiple definition errors.
+ */
+#  define OPENTELEMETRY_DEFINE_PLUGIN_HOOK(X)                                   \
+    extern "C" {                                                                \
+    extern __declspec(dllexport) opentelemetry::plugin::OpenTelemetryHook const \
+        OpenTelemetryMakeFactoryImpl;                                           \
+                                                                                \
+    __declspec(selectany) opentelemetry::plugin::OpenTelemetryHook const        \
+        OpenTelemetryMakeFactoryImpl = X;                                       \
+    }  // extern "C"
+
+#else
+
+#  define OPENTELEMETRY_DEFINE_PLUGIN_HOOK(X)                                                      \
+    extern "C" {                                                                                   \
+    __attribute((                                                                                  \
+        weak)) extern opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl; \
+                                                                                                   \
+    opentelemetry::plugin::OpenTelemetryHook const OpenTelemetryMakeFactoryImpl = X;               \
+    }  // extern "C"
+
+#endif
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace plugin
+{
+
+struct LoaderInfo;
+class FactoryImpl;
+
+using OpenTelemetryHook =
+    nostd::unique_ptr<Factory::FactoryImpl> (*)(const LoaderInfo &loader_info,
+                                                nostd::unique_ptr<char[]> &error_message);
+}  // namespace plugin
+OPENTELEMETRY_END_NAMESPACE