[CODE HEALTH] fix clang-tidy cppcoreguidelines-pro-type-const-cast warnings

examples/http/server.cc

@@ -51,9 +51,7 @@ class RequestHandler : public HTTP_SERVER_NS::HttpRequestCallback
     std::string span_name = request.uri;
 
     // extract context from http header
-    std::map<std::string, std::string> &request_headers =
-        const_cast<std::map<std::string, std::string> &>(request.headers);
-    const HttpTextMapCarrier<std::map<std::string, std::string>> carrier(request_headers);
+    const HttpTextMapCarrier<std::map<std::string, std::string>> carrier(request.headers);
     auto prop        = context::propagation::GlobalTextMapPropagator::GetGlobalPropagator();
     auto current_ctx = context::RuntimeContext::GetCurrent();
     auto new_context = prop->Extract(carrier, current_ctx);

examples/http/tracer_common.h

@@ -29,7 +29,7 @@ template <typename T>
 class HttpTextMapCarrier : public opentelemetry::context::propagation::TextMapCarrier
 {
 public:
-  HttpTextMapCarrier(T &headers) : headers_(headers) {}
+  HttpTextMapCarrier(const T &headers) : headers_(headers) {}
   HttpTextMapCarrier() = default;
   opentelemetry::nostd::string_view Get(
       opentelemetry::nostd::string_view key) const noexcept override

ext/include/opentelemetry/ext/http/client/curl/http_operation_curl.h

@@ -290,12 +290,11 @@ class HttpOperation
   inline CURL *GetCurlEasyHandle() noexcept { return curl_resource_.easy_handle; }
 
 private:
-  CURLcode SetCurlPtrOption(CURLoption option, void *value);
+  CURLcode SetCurlPtrOption(CURLoption option, const void *value);
 
   CURLcode SetCurlStrOption(CURLoption option, const char *str)
   {
-    void *ptr = const_cast<char *>(str);
-    return SetCurlPtrOption(option, ptr);
+    return SetCurlPtrOption(option, str);
   }
 
   CURLcode SetCurlBlobOption(CURLoption option, struct curl_blob *blob)

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

@@ -721,7 +721,7 @@ const char *HttpOperation::GetCurlErrorMessage(CURLcode code)
   return message;
 }
 
-CURLcode HttpOperation::SetCurlPtrOption(CURLoption option, void *value)
+CURLcode HttpOperation::SetCurlPtrOption(CURLoption option, const void *value)
 {
   /*
     curl_easy_setopt() is a macro with variadic arguments, type unsafe.
@@ -912,6 +912,7 @@ CURLcode HttpOperation::Setup()
 
       struct curl_blob stblob
       {};
+      // NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
       stblob.data  = const_cast<char *>(data);
       stblob.len   = data_len;
       stblob.flags = CURL_BLOB_COPY;
@@ -954,6 +955,7 @@ CURLcode HttpOperation::Setup()
 
       struct curl_blob stblob
       {};
+      // NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
       stblob.data  = const_cast<char *>(data);
       stblob.len   = data_len;
       stblob.flags = CURL_BLOB_COPY;
@@ -1002,6 +1004,7 @@ CURLcode HttpOperation::Setup()
 
       struct curl_blob stblob
       {};
+      // NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast)
       stblob.data  = const_cast<char *>(data);
       stblob.len   = data_len;
       stblob.flags = CURL_BLOB_COPY;

ext/test/w3c_tracecontext_http_test_server/main.cc

@@ -203,7 +203,7 @@ int main(int argc, char *argv[])
 
         for (auto &part : body)
         {
-          auto headers_2 = const_cast<std::map<std::string, std::string> &>(req.headers);
+          auto headers_2 = req.headers;
 
           const TextMapCarrierTest carrier(headers_2);
           auto current_ctx = context::RuntimeContext::GetCurrent();

sdk/include/opentelemetry/sdk/common/circular_buffer.h

@@ -38,10 +38,7 @@ class CircularBuffer
    *
    * Note: This method must only be called from the consumer thread.
    */
-  CircularBufferRange<const AtomicUniquePtr<T>> Peek() const noexcept
-  {
-    return const_cast<CircularBuffer *>(this)->PeekImpl();
-  }
+  CircularBufferRange<const AtomicUniquePtr<T>> Peek() const noexcept { return PeekImpl(); }
 
   /**
    * Consume elements from the circular buffer's tail.
@@ -172,7 +169,7 @@ class CircularBuffer
   std::atomic<uint64_t> head_{0};
   std::atomic<uint64_t> tail_{0};
 
-  CircularBufferRange<AtomicUniquePtr<T>> PeekImpl() noexcept
+  CircularBufferRange<AtomicUniquePtr<T>> PeekImpl() const noexcept
   {
     uint64_t tail_index = tail_ % capacity_;
     uint64_t head_index = head_ % capacity_;