Updates to inline TODO notes + Small optimization on element_size check

src/client/dbps_api_client.cpp

@@ -28,8 +28,10 @@ using namespace dbps::external;
 using namespace dbps::enum_utils;
 
 // Generate a simple unique reference ID using timestamp
-// TODO: Potentially not-unique if concurrent calls are made on the same millisecond.
-//       Can use atomic counters but may not be an issue to justify the complexity.
+
+// Potential improvement:
+// - Potentially not-unique if concurrent calls are made on the same millisecond.
+// - Can use atomic counters but may not be an issue to justify the complexity.
 std::string GenerateReferenceId() {
     auto now = std::chrono::system_clock::now();
     auto timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(

src/common/dbpa_remote.cpp

@@ -341,7 +341,7 @@ std::unique_ptr<DecryptionResult> RemoteDataBatchProtectionAgent::Decrypt(span<c
     );
 
     // Validate that response fields match request fields
-    // TODO: Add validation for encoding when these are expanded beyond PLAIN.
+    // Potential improvement: Add validation for encoding when these are expanded beyond PLAIN.
     if (response.Success()) {
         const auto& response_attrs = response.GetResponseAttributes();
 
@@ -452,7 +452,7 @@ std::shared_ptr<HttpClientBase> RemoteDataBatchProtectionAgent::InstantiateHttpC
     // get the client for the given server_url_ with configured number of worker threads
     std::size_t num_worker_threads = ExtractNumWorkerThreads(*config_json_opt);
 
-    // TODO: Split credentials config file key and credentials file from connection config.
+    // Potential improvement: Split credentials config file key and credentials file from connection config.
     HttpClientBase::ClientCredentials credentials = ExtractClientCredentials(*config_json_opt);
 
     std::shared_ptr<HttpClientBase> http_client =
@@ -549,7 +549,7 @@ HttplibPoolRegistry::PoolConfig RemoteDataBatchProtectionAgent::ExtractPoolConfi
     pool_config.write_timeout = std::chrono::seconds(
         get_int_or_default(config_json, "connection_pool.write_timeout_seconds", HttplibPoolRegistry::kDefaultWriteTimeout_s.count()));
 
-    //TODO: find a better way to log this.
+    //Potential improvement: find a better way to log this.
     // Log the configured pool values for observability
     std::cerr << "INFO: RemoteDataBatchProtectionAgent::init() - HTTP pool config {"
     << " max_pool_size=" << pool_config.max_pool_size

src/common/dbpa_remote.h

@@ -104,8 +104,10 @@ class DBPS_EXPORT RemoteDataBatchProtectionAgent : public DataBatchProtectionAge
     // Constructor with HTTP client passed. Creates API_client immediately on the contructor.
     explicit RemoteDataBatchProtectionAgent(std::shared_ptr<HttpClientBase> http_client);
 
-    // TODO: Split credentials config file key and credentials file from connection config.
-    //   Currently these live on the same file, but should be separate as they may have different access permissions.
+    // Potential improvement:
+    // - Split credentials config file key and credentials file from connection config.
+    // - Currently these live on the same file, but should be separate as they may have different access permissions.
+
     // Configuration map keys
     inline static const std::string k_connection_config_key_ = "connection_config_file_path";
 

src/common/json_request.cpp

@@ -143,8 +143,9 @@ std::string EncodeBase64Safe(const std::vector<uint8_t>& data) {
     }
 }
 
+// Potential improvement: Unify usage of nlohmann or crow json for parsing and dumping.
+
 // Allow strings or nested structures in the JSON payload for authentication credentials.
-// TODO(Issue #205): Unify usage of nlohmann or crow json for parsing and dumping.
 std::optional<std::string> TokenRequest::ParseWithError(const std::string& request_body) {
     credential_values_.clear();
 

src/processing/parquet_utils.cpp

@@ -239,6 +239,7 @@ int CalculateLevelBytesLength(tcb::span<const uint8_t> raw,
         int32_t def_level_length = std::get<int32_t>(encoding_attribs.at("page_v2_definition_levels_byte_length"));
         int32_t rep_level_length = std::get<int32_t>(encoding_attribs.at("page_v2_repetition_levels_byte_length"));
         total_level_bytes = def_level_length + rep_level_length;
+
     } else if (page_type == "DATA_PAGE_V1") {
         // Check that encoding types are RLE (instead of BIT_PACKED which is deprecated)
         const std::string& rep_encoding = std::get<std::string>(encoding_attribs.at("page_v1_repetition_level_encoding"));
@@ -301,7 +302,7 @@ LevelAndValueBytes DecompressAndSplit(
     auto page_type = std::get<std::string>(encoding_attributes.at("page_type"));
 
     // On DATA_PAGE_V1, the whole payload is compressed.
-    // So the split of level and value byte requires to
+    // So the split of level and value byte requires to:
     // (1) decompress the whole payload, (2) calculate length of level bytes, (3) split into level and value bytes.
     if (page_type == "DATA_PAGE_V1") {
         auto decompressed_bytes = Decompress(plaintext, compression);
@@ -330,7 +331,7 @@ LevelAndValueBytes DecompressAndSplit(
     }
 
     // On DATA_PAGE_V2, only the value bytes are compressed.
-    // So the split of level and value byte requires to
+    // So the split of level and value byte requires to:
     // (1) calculate length of level bytes, (2) split into level, (3) decompress only the value bytes.
     if (page_type == "DATA_PAGE_V2") {
         int leading_bytes_to_strip = CalculateLevelBytesLength(

src/processing/typed_buffer.h

@@ -96,8 +96,8 @@ class ByteBuffer {
 
     // Attribute for the number of elements in the buffer (a const)
     // - `num_elements_` is a const and passed during construction of both read-only and write buffers.
-    // - It indicates the expected number of elements in the buffer payload declared upfront.
-    // - This is treated as an invariant, so if the payload count mismatches, exceptions are thrown.
+    // - It indicates the expected number of elements in the buffer payload.
+    // - This is treated as an invariant. If the actual payload count mismatches, exceptions are thrown.
     const size_t num_elements_;
 
     // Variables for element span iterator.
@@ -155,7 +155,7 @@ ByteBuffer<Codec>::ByteBuffer(
     Codec codec)
     : elements_span_(elements_span),
       elements_span_size_(elements_span.size()),
-      // `num_elements_` is the expected number of elements in the buffer declared upfront.
+      // `num_elements_` is the expected number of elements in the buffer.
       // - if the actual payload count mismatches, exceptions are thrown.
       num_elements_(num_elements),
       codec_(std::move(codec)),
@@ -206,15 +206,12 @@ inline void ByteBuffer<Codec>::InitializeFromSpan() const {
     // Fixed-size layout has implicit offsets from index * element_size.
     // We validate shape and derive element count. No need to store offsets.
     if constexpr (is_fixed_sized) {
-        if (element_size_ <= 0) {
-            throw InvalidInputException("Invalid fixed-size buffer: element_size must be greater than zero");
-        }
         if ((readable_size % element_size_) != 0) {
             throw InvalidInputException("Malformed fixed-size buffer: buffer does not align with element_size");
         }
 
         // Check if the num_elements passed at contruction time coincides with the calculated from the payload size.
-        // This is a division of integer values, however it results in a correct integer result because of the modulo guard above.
+        // Although this is a division of integers, the result is an integer (no remainder) because of the modulo guard above.
         const size_t num_elements_on_payload = readable_size / element_size_;
         if (num_elements_on_payload != num_elements_) {
             throw InvalidInputException("Malformed fixed-size buffer: num_elements on payload != num_elements_ expected.");
@@ -454,10 +451,6 @@ template <class Codec>
 inline void ByteBuffer<Codec>::InitializeForWriteBuffer(size_t variable_size_reserved_bytes_hint) {
     // Fixed-size elements
     if constexpr (is_fixed_sized) {
-        if (element_size_ <= 0) {
-            throw InvalidInputException("Invalid fixed-size buffer: element_size must be greater than zero");
-        }
-
         // write_buffer can be allocated to precise size since the element size and number of elements are known.
         // We initialize it to 0s to have random-ish access during writes.
         const size_t fixed_size_total_bytes = prefix_size_ + (num_elements_ * element_size_);

src/server/dbps_api_server.cpp

@@ -55,8 +55,11 @@ int main(int argc, char* argv[]) {
     // Initialize credentials file path and JWT secret key with parsed command line options
     std::optional<std::string> credentials_file_path = std::nullopt;
     std::string jwt_secret_key = "default-secret-key-overwritten-by-command-line";
-    // TODO: Flip allow_missing_credentials=False when instructions are updated with the cmdline flags to run the server.
+
+    // `allow_missing_credentials` is set to true to allow a missing credentials file to be used.
+    // This is useful for development and testing purposes, but should be set to false in production.
     bool allow_missing_credentials = true;
+
     try {
         cxxopts::Options options("dbps_api_server", "Data Batch Protection Service API Server");
         options.add_options()