Extend network response with diagnostics

Implement request diagnostics for NetworkCurl.
Add response timings for a request, it includes timings for:
* queue time
* dns resolution time
* connect + ssl handshake time
* send, wait, receive time
* total time taken

Relates-To: OCMAM-418

Signed-off-by: Mykhailo Kuchma <ext-mykhailo.kuchma@here.com>

Author: mykhailo-kuchma

olp-cpp-sdk-core/include/olp/core/http/NetworkResponse.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2020 HERE Europe B.V.
+ * Copyright (C) 2019-2025 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,8 +24,39 @@
 #include <olp/core/CoreApi.h>
 #include <olp/core/http/NetworkTypes.h>
 
+#include <array>
+#include <bitset>
+#include <boost/optional/optional.hpp>
+#include <chrono>
+
 namespace olp {
 namespace http {
+
+/**
+ * @brief Network request timings.
+ */
+struct Diagnostics {
+  using MicroSeconds = std::chrono::duration<uint32_t, std::micro>;
+
+  enum Timings {
+    Queue = 0,      // Delay until the request is processed
+    NameLookup,     // Time taken for DNS name lookup
+    Connect,        // Time taken to establish connection
+    SSL_Handshake,  // Time taken to establish a secured connection
+    Send,           // Time taken to send the request
+    Wait,           // Time delay until server starts responding
+    Receive,        // Time taken to receive the response
+    Total,          // Total time taken for reqeust
+    Count
+  };
+
+  /// Timing values
+  std::array<MicroSeconds, Count> timings{};
+
+  /// Availability flag, specify which timing is available
+  std::bitset<Count> available_timings{};
+};
+
 /**
  * @brief A network response abstraction for the HTTP request.
  */
@@ -126,6 +157,22 @@ class CORE_API NetworkResponse final {
    */
   NetworkResponse& WithBytesDownloaded(uint64_t bytes_downloaded);
 
+  /**
+   * @brief Gets the optional diagnostics if set.
+   *
+   * @return Diagnostic values.
+   */
+  const boost::optional<Diagnostics>& GetDiagnostics() const;
+
+  /**
+   * @brief Sets the request diagnostics.
+   *
+   * @param diagnostics Diagnostics values.
+   *
+   * @return A reference to *this.
+   */
+  NetworkResponse& WithDiagnostics(Diagnostics diagnostics);
+
  private:
   /// The associated request ID.
   RequestId request_id_{0};
@@ -134,9 +181,11 @@ class CORE_API NetworkResponse final {
   /// The human-readable error message if the associated request failed.
   std::string error_;
   /// The number of bytes uploaded during the network request.
-  uint64_t bytes_uploaded_;
+  uint64_t bytes_uploaded_{0};
   /// The number of bytes downloaded during the network request.
-  uint64_t bytes_downloaded_;
+  uint64_t bytes_downloaded_{0};
+  /// Diagnostics
+  boost::optional<Diagnostics> diagnostics_;
 };
 
 }  // namespace http

olp-cpp-sdk-core/src/http/NetworkResponse.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2020 HERE Europe B.V.
+ * Copyright (C) 2019-2025 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -65,5 +65,14 @@ NetworkResponse& NetworkResponse::WithBytesDownloaded(
   return *this;
 }
 
+NetworkResponse& NetworkResponse::WithDiagnostics(Diagnostics diagnostics) {
+  diagnostics_ = diagnostics;
+  return *this;
+}
+
+const boost::optional<Diagnostics>& NetworkResponse::GetDiagnostics() const {
+  return diagnostics_;
+}
+
 }  // namespace http
 }  // namespace olp

olp-cpp-sdk-core/src/http/curl/NetworkCurl.cpp

@@ -348,6 +348,41 @@ void SetupDns(CURL* curl_handle, const std::vector<std::string>& dns_servers) {
 #endif
 }
 
+Diagnostics GetDiagnostics(CURL* handle) {
+  Diagnostics diagnostics;
+
+  const std::pair<Diagnostics::Timings, CURLINFO> available_timings[] = {
+#if CURL_AT_LEAST_VERSION(8, 6, 0)
+    {Diagnostics::Queue, CURLINFO_QUEUE_TIME_T},
+#endif
+    {Diagnostics::NameLookup, CURLINFO_NAMELOOKUP_TIME_T},
+    {Diagnostics::Connect, CURLINFO_CONNECT_TIME_T},
+    {Diagnostics::SSL_Handshake, CURLINFO_APPCONNECT_TIME_T},
+    {Diagnostics::Send, CURLINFO_PRETRANSFER_TIME_T},
+#if CURL_AT_LEAST_VERSION(8, 10, 0)
+    {Diagnostics::Wait, CURLINFO_POSTTRANSFER_TIME_T},
+#endif
+    {Diagnostics::Receive, CURLINFO_STARTTRANSFER_TIME_T},
+    {Diagnostics::Total, CURLINFO_TOTAL_TIME_T}
+  };
+
+  curl_off_t last_time_point{0};
+
+  for (const auto& available_timing : available_timings) {
+    curl_off_t time_point_us = 0;
+    if (curl_easy_getinfo(handle, available_timing.second, &time_point_us) ==
+            CURLE_OK &&
+        time_point_us > 0) {
+      diagnostics.timings[available_timing.first] =
+          Diagnostics::MicroSeconds(time_point_us - last_time_point);
+      diagnostics.available_timings.set(available_timing.first);
+      last_time_point = time_point_us;
+    }
+  }
+
+  return diagnostics;
+}
+
 }  // anonymous namespace
 
 NetworkCurl::NetworkCurl(NetworkInitializationSettings settings)
@@ -1004,7 +1039,8 @@ void NetworkCurl::CompleteMessage(CURL* curl_handle, CURLcode result) {
   auto response = NetworkResponse()
                       .WithRequestId(request_handle->id)
                       .WithBytesDownloaded(download_bytes)
-                      .WithBytesUploaded(upload_bytes);
+                      .WithBytesUploaded(upload_bytes)
+                      .WithDiagnostics(GetDiagnostics(curl_handle));
 
   if (request_handle->is_cancelled) {
     response.WithStatus(static_cast<int>(ErrorCode::CANCELLED_ERROR))
@@ -1199,7 +1235,9 @@ void NetworkCurl::Run() {
                     .WithStatus(static_cast<int>(ErrorCode::IO_ERROR))
                     .WithError("CURL error")
                     .WithBytesDownloaded(download_bytes)
-                    .WithBytesUploaded(upload_bytes);
+                    .WithBytesUploaded(upload_bytes)
+                    .WithDiagnostics(GetDiagnostics(curl_handle));
+
             callback(response);
             lock.lock();
           }