Add compile-time flag

Author: chusitoo

CMakeLists.txt

@@ -215,6 +215,8 @@ option(
   "Whether to include gzip compression for the OTLP http exporter in the SDK"
   OFF)
 
+option(WITH_CURL_LOGGING "Whether to enable select CURL verbosity in OTel logs" OFF)
+
 option(WITH_ZIPKIN "Whether to include the Zipkin exporter in the SDK" OFF)
 
 option(WITH_PROMETHEUS "Whether to include the Prometheus Client in the SDK"

ext/src/http/client/curl/CMakeLists.txt

@@ -24,6 +24,11 @@ else()
     PRIVATE ${CURL_LIBRARIES})
 endif()
 
+if(WITH_CURL_LOGGING)
+  target_compile_definitions(opentelemetry_http_client_curl
+                             PRIVATE ENABLE_CURL_LOGGING)
+endif()
+
 if(WITH_OTLP_HTTP_COMPRESSION)
   if(TARGET ZLIB::ZLIB)
     target_link_libraries(

ext/src/http/client/curl/http_operation_curl.cc

@@ -633,6 +633,12 @@ int HttpOperation::CurlLoggerCallback(const CURL * /* handle */,
 
 CURLcode HttpOperation::Setup()
 {
+#ifdef ENABLE_CURL_LOGGING
+  static constexpr auto kEnableCurlLogging = true;
+#else
+  static constexpr auto kEnableCurlLogging = false;
+#endif  // ENABLE_CURL_LOGGING
+
   if (!curl_resource_.easy_handle)
   {
     return CURLE_FAILED_INIT;
@@ -643,7 +649,7 @@ CURLcode HttpOperation::Setup()
   curl_error_message_[0] = '\0';
   curl_easy_setopt(curl_resource_.easy_handle, CURLOPT_ERRORBUFFER, curl_error_message_);
 
-  rc = SetCurlLongOption(CURLOPT_VERBOSE, static_cast<long>(needs_to_log_));
+  rc = SetCurlLongOption(CURLOPT_VERBOSE, static_cast<long>(needs_to_log_ || kEnableCurlLogging));
   if (rc != CURLE_OK)
   {
     return rc;