core-clp: Add support for decompressing a specific file split from a clp archive into one or more IR files.

components/core/CMakeLists.txt

@@ -332,9 +332,12 @@ set(SOURCE_FILES_unitTest
         src/clp/GlobalSQLiteMetadataDB.hpp
         src/clp/Grep.cpp
         src/clp/Grep.hpp
+        src/clp/ir/constants.hpp
         src/clp/ir/LogEvent.hpp
         src/clp/ir/LogEventDeserializer.cpp
         src/clp/ir/LogEventDeserializer.hpp
+        src/clp/ir/LogEventSerializer.cpp
+        src/clp/ir/LogEventSerializer.hpp
         src/clp/ir/parsing.cpp
         src/clp/ir/parsing.hpp
         src/clp/ir/parsing.inc

components/core/src/clp/clp/CMakeLists.txt

@@ -36,9 +36,12 @@ set(
         ../GlobalMySQLMetadataDB.hpp
         ../GlobalSQLiteMetadataDB.cpp
         ../GlobalSQLiteMetadataDB.hpp
+        ../ir/constants.hpp
         ../ir/LogEvent.hpp
         ../ir/LogEventDeserializer.cpp
         ../ir/LogEventDeserializer.hpp
+        ../ir/LogEventSerializer.cpp
+        ../ir/LogEventSerializer.hpp
         ../ir/parsing.cpp
         ../ir/parsing.hpp
         ../ir/parsing.inc

components/core/src/clp/clp/FileDecompressor.cpp

@@ -1,13 +1,59 @@
 #include "FileDecompressor.hpp"
 
+#include <boost/filesystem.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <boost/filesystem/path.hpp>
 
-#include "../spdlog_with_specializations.hpp"
+#include "../ir/constants.hpp"
+#include "../ir/LogEventSerializer.hpp"
+#include "../ir/utils.hpp"
 
+using clp::ir::four_byte_encoded_variable_t;
+using clp::ir::LogEventSerializer;
 using std::string;
 
 namespace clp::clp {
+namespace {
+/**
+ * Renames a temporary IR file and moves it to the output directory.
+ *
+ * The new name uses the following format:
+ * <orig_file_id>_<begin_message_ix>_<end_message_ix>.clp.zst
+ * @param temp_ir
+ * @param output_directory
+ * @param orig_file_id
+ * @param begin_message_ix
+ * @param end_message_ix
+ * @return Whether the IR file is successfully renamed.
+ */
+bool rename_ir_file(
+        boost::filesystem::path const& temp_ir_path,
+        boost::filesystem::path const& output_directory,
+        string const& file_orig_id,
+        size_t begin_message_ix,
+        size_t end_message_ix
+) {
+    auto ir_file_name = file_orig_id;
+    ir_file_name += "_" + std::to_string(begin_message_ix);
+    ir_file_name += "_" + std::to_string(end_message_ix);
+    ir_file_name += ir::cIrFileExtension;
+
+    auto const renamed_ir_path = output_directory / ir_file_name;
+    try {
+        boost::filesystem::rename(temp_ir_path, renamed_ir_path);
+    } catch (boost::filesystem::filesystem_error const& e) {
+        SPDLOG_ERROR(
+                "Failed to rename from {} to {}. Error: {}",
+                temp_ir_path.c_str(),
+                renamed_ir_path.c_str(),
+                e.what()
+        );
+        return false;
+    }
+    return true;
+}
+}  // namespace
+
 bool FileDecompressor::decompress_file(
         streaming_archive::MetadataDB::FileIterator const& file_metadata_ix,
         string const& output_dir,
@@ -76,4 +122,125 @@ bool FileDecompressor::decompress_file(
 
     return true;
 }
+
+bool FileDecompressor::decompress_to_ir(
+        streaming_archive::MetadataDB::FileIterator const& file_metadata_ix,
+        string const& output_dir,
+        string const& temp_output_dir,
+        streaming_archive::reader::Archive& archive_reader,
+        size_t ir_target_size
+) {
+    // Open encoded file
+    if (auto const error_code = archive_reader.open_file(m_encoded_file, file_metadata_ix);
+        ErrorCode_Success != error_code)
+    {
+        if (ErrorCode_errno == error_code) {
+            SPDLOG_ERROR("Failed to open encoded file, errno={}", errno);
+        } else {
+            SPDLOG_ERROR("Failed to open encoded file, error_code={}", error_code);
+        }
+        return false;
+    }
+
+    // Generate output directory
+    if (auto const error_code = create_directory_structure(output_dir, 0700);
+        ErrorCode_Success != error_code)
+    {
+        SPDLOG_ERROR(
+                "Failed to create directory structure {}, errno={}",
+                output_dir.c_str(),
+                errno
+        );
+        return false;
+    }
+
+    if (temp_output_dir != output_dir) {
+        // Generate temporary output directory
+        if (auto const error_code = create_directory_structure(temp_output_dir, 0700);
+            ErrorCode_Success != error_code)
+        {
+            SPDLOG_ERROR(
+                    "Failed to create directory structure {}, errno={}",
+                    temp_output_dir.c_str(),
+                    errno
+            );
+            return false;
+        }
+    }
+
+    boost::filesystem::path temp_ir_path{temp_output_dir};
+    auto temp_ir_file = m_encoded_file.get_id_as_string();
+    temp_ir_file += ir::cIrFileExtension;
+    temp_ir_path /= temp_ir_file;
+
+    auto const& file_orig_id = m_encoded_file.get_orig_file_id_as_string();
+    auto begin_message_ix = m_encoded_file.get_begin_message_ix();
+
+    LogEventSerializer<four_byte_encoded_variable_t> ir_serializer;
+    // Open output IR file
+    if (false == ir_serializer.open(temp_ir_path.string())) {
+        SPDLOG_ERROR("Failed to serialize preamble");
+        return false;
+    }
+
+    while (archive_reader.get_next_message(m_encoded_file, m_encoded_message)) {
+        if (false
+            == archive_reader
+                       .decompress_message_without_ts(m_encoded_message, m_decompressed_message))
+        {
+            SPDLOG_ERROR("Failed to decompress message");
+            return false;
+        }
+
+        if (ir_serializer.get_serialized_size() >= ir_target_size) {
+            ir_serializer.close();
+
+            auto const end_message_ix = begin_message_ix + ir_serializer.get_num_log_events();
+            if (false
+                == rename_ir_file(
+                        temp_ir_path,
+                        output_dir,
+                        file_orig_id,
+                        begin_message_ix,
+                        end_message_ix
+                ))
+            {
+                return false;
+            }
+            begin_message_ix = end_message_ix;
+
+            if (false == ir_serializer.open(temp_ir_path.string())) {
+                SPDLOG_ERROR("Failed to serialize preamble");
+                return false;
+            }
+        }
+
+        if (false
+            == ir_serializer.serialize_log_event(
+                    m_encoded_message.get_ts_in_milli(),
+                    m_decompressed_message
+            ))
+        {
+            SPDLOG_ERROR(
+                    "Failed to serialize log event: {} with ts {}",
+                    m_decompressed_message.c_str(),
+                    m_encoded_message.get_ts_in_milli()
+            );
+            return false;
+        }
+    }
+    auto const end_message_ix = begin_message_ix + ir_serializer.get_num_log_events();
+    ir_serializer.close();
+
+    // NOTE: We don't remove temp_output_dir because we don't know if it existed before this method
+    // was called.
+    if (false
+        == rename_ir_file(temp_ir_path, output_dir, file_orig_id, begin_message_ix, end_message_ix))
+    {
+        return false;
+    }
+
+    archive_reader.close_file(m_encoded_file);
+    return true;
+}
 }  // namespace clp::clp

components/core/src/clp/clp/FileDecompressor.hpp

@@ -1,6 +1,7 @@
 #ifndef CLP_CLP_FILEDECOMPRESSOR_HPP
 #define CLP_CLP_FILEDECOMPRESSOR_HPP
 
+#include <cstddef>
 #include <string>
 
 #include "../FileWriter.hpp"
@@ -24,6 +25,14 @@ class FileDecompressor {
             std::unordered_map<std::string, std::string>& temp_path_to_final_path
     );
 
+    bool decompress_to_ir(
+            streaming_archive::MetadataDB::FileIterator const& file_metadata_ix,
+            std::string const& output_dir,
+            std::string const& temp_output_dir,
+            streaming_archive::reader::Archive& archive_reader,
+            size_t ir_target_size
+    );
+
 private:
     // Variables
     FileWriter m_decompressed_file_writer;

components/core/src/clp/ir/LogEventSerializer.cpp

@@ -0,0 +1,160 @@
+#include "LogEventSerializer.hpp"
+
+#include <string>
+#include <string_view>
+
+#include <spdlog/spdlog.h>
+
+#include "../Defs.h"
+#include "../ErrorCode.hpp"
+#include "../ffi/ir_stream/encoding_methods.hpp"
+#include "../ffi/ir_stream/protocol_constants.hpp"
+#include "../ir/types.hpp"
+#include "../type_utils.hpp"
+
+using std::string;
+using std::string_view;
+
+namespace clp::ir {
+template <typename encoded_variable_t>
+LogEventSerializer<encoded_variable_t>::~LogEventSerializer() {
+    if (m_is_open) {
+        SPDLOG_ERROR("clp::ir::LogEventSerializer not closed before being destroyed - output maybe "
+                     "corrupted.");
+    }
+}
+
+template <typename encoded_variable_t>
+auto LogEventSerializer<encoded_variable_t>::open(string const& file_path) -> bool {
+    if (m_is_open) {
+        throw OperationFailed(ErrorCode_NotReady, __FILENAME__, __LINE__);
+    }
+
+    m_serialized_size = 0;
+    m_num_log_events = 0;
+    m_ir_buf.clear();
+
+    m_writer.open(file_path, FileWriter::OpenMode::CREATE_FOR_WRITING);
+    m_zstd_compressor.open(m_writer);
+
+    bool res{};
+    if constexpr (std::is_same_v<encoded_variable_t, four_byte_encoded_variable_t>) {
+        m_prev_event_timestamp = 0;
+        res = ffi::ir_stream::four_byte_encoding::serialize_preamble(
+                cTimestampPattern,
+                cTimestampPatternSyntax,
+                cTimezoneID,
+                m_prev_event_timestamp,
+                m_ir_buf
+        );
+    } else {
+        res = clp::ffi::ir_stream::eight_byte_encoding::serialize_preamble(
+                cTimestampPattern,
+                cTimestampPatternSyntax,
+                cTimezoneID,
+                m_ir_buf
+        );
+    }
+
+    if (false == res) {
+        close_writer();
+        return false;
+    }
+
+    m_is_open = true;
+
+    // Flush the preamble
+    flush();
+
+    return true;
+}
+
+template <typename encoded_variable_t>
+auto LogEventSerializer<encoded_variable_t>::flush() -> void {
+    if (false == m_is_open) {
+        throw OperationFailed(ErrorCode_NotInit, __FILENAME__, __LINE__);
+    }
+    m_zstd_compressor.write(
+            size_checked_pointer_cast<char const>(m_ir_buf.data()),
+            m_ir_buf.size()
+    );
+    m_ir_buf.clear();
+}
+
+template <typename encoded_variable_t>
+auto LogEventSerializer<encoded_variable_t>::close() -> void {
+    if (false == m_is_open) {
+        throw OperationFailed(ErrorCode_NotInit, __FILENAME__, __LINE__);
+    }
+    m_ir_buf.push_back(clp::ffi::ir_stream::cProtocol::Eof);
+    flush();
+    close_writer();
+    m_is_open = false;
+}
+
+template <typename encoded_variable_t>
+auto LogEventSerializer<encoded_variable_t>::serialize_log_event(
+        epoch_time_ms_t timestamp,
+        string_view message
+) -> bool {
+    if (false == m_is_open) {
+        throw OperationFailed(ErrorCode_NotInit, __FILENAME__, __LINE__);
+    }
+
+    string logtype;
+    bool res{};
+    auto const buf_size_before_serialization = m_ir_buf.size();
+    if constexpr (std::is_same_v<encoded_variable_t, eight_byte_encoded_variable_t>) {
+        res = clp::ffi::ir_stream::eight_byte_encoding::serialize_log_event(
+                timestamp,
+                message,
+                logtype,
+                m_ir_buf
+        );
+    } else {
+        auto const timestamp_delta = timestamp - m_prev_event_timestamp;
+        m_prev_event_timestamp = timestamp;
+        res = clp::ffi::ir_stream::four_byte_encoding::serialize_log_event(
+                timestamp_delta,
+                message,
+                logtype,
+                m_ir_buf
+        );
+    }
+    if (false == res) {
+        return false;
+    }
+    m_serialized_size += m_ir_buf.size() - buf_size_before_serialization;
+    ++m_num_log_events;
+    return true;
+}
+
+template <typename encoded_variable_t>
+auto LogEventSerializer<encoded_variable_t>::close_writer() -> void {
+    m_zstd_compressor.close();
+    m_writer.close();
+}
+
+// Explicitly declare template specializations so that we can define the template methods in this
+// file
+template LogEventSerializer<eight_byte_encoded_variable_t>::~LogEventSerializer();
+template LogEventSerializer<four_byte_encoded_variable_t>::~LogEventSerializer();
+template auto LogEventSerializer<eight_byte_encoded_variable_t>::open(string const& file_path
+) -> bool;
+template auto LogEventSerializer<four_byte_encoded_variable_t>::open(string const& file_path
+) -> bool;
+template auto LogEventSerializer<eight_byte_encoded_variable_t>::flush() -> void;
+template auto LogEventSerializer<four_byte_encoded_variable_t>::flush() -> void;
+template auto LogEventSerializer<eight_byte_encoded_variable_t>::close() -> void;
+template auto LogEventSerializer<four_byte_encoded_variable_t>::close() -> void;
+template auto LogEventSerializer<eight_byte_encoded_variable_t>::serialize_log_event(
+        epoch_time_ms_t timestamp,
+        string_view message
+) -> bool;
+template auto LogEventSerializer<four_byte_encoded_variable_t>::serialize_log_event(
+        epoch_time_ms_t timestamp,
+        string_view message
+) -> bool;
+template auto LogEventSerializer<eight_byte_encoded_variable_t>::close_writer() -> void;
+template auto LogEventSerializer<four_byte_encoded_variable_t>::close_writer() -> void;
+}  // namespace clp::ir