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leveldb: show non-default options during init

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Example output:
> Opened LevelDB successfully with options: options.compression=NoCompression, options.create_if_missing=true, options.max_file_size=33554432, options.paranoid_checks=true, options.write_buffer_size=524288, readoptions.fill_cache=false, readoptions.verify_checksums=true, writeoptions.sync=true
This commit is contained in:
Lőrinc 2025-01-12 18:14:26 +01:00
parent 35bf426e02
commit 8af25b011b
1 changed files with 44 additions and 1 deletions
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45
src/dbwrapper.cpp
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@ -28,9 +28,12 @@
#include <leveldb/slice.h>
#include <leveldb/status.h>
#include <leveldb/write_batch.h>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
static auto CharCast(const std::byte* data) { return reinterpret_cast<const char*>(data); }
@ -219,6 +222,46 @@ struct LevelDBContext {
leveldb::DB* pdb;
};
static std::string GetChangedOptions(const LevelDBContext& context)
{
std::map<std::string, std::string> current, defaults;
auto process_options{[&]<typename OPTION>(const OPTION& options, const OPTION& default_options, const std::string& prefix) {
auto add_options_to_map{[&](const OPTION& op, std::map<std::string, std::string>& map) {
auto ToString{[](const bool value) { return value ? "true" : "false"; }};
if constexpr (std::is_same_v<OPTION, leveldb::Options>) {
map[prefix + "create_if_missing"] = ToString(op.create_if_missing);
map[prefix + "error_if_exists"] = ToString(op.error_if_exists);
map[prefix + "paranoid_checks"] = ToString(op.paranoid_checks);
map[prefix + "write_buffer_size"] = util::ToString(op.write_buffer_size);
map[prefix + "max_open_files"] = util::ToString(op.max_open_files);
map[prefix + "block_size"] = util::ToString(op.block_size);
map[prefix + "max_file_size"] = util::ToString(op.max_file_size);
map[prefix + "compression"] = op.compression == leveldb::kNoCompression ? "NoCompression" : "SnappyCompression";
} else if constexpr (std::is_same_v<OPTION, leveldb::ReadOptions>) {
map[prefix + "verify_checksums"] = ToString(op.verify_checksums);
map[prefix + "fill_cache"] = ToString(op.fill_cache);
} else if constexpr (std::is_same_v<OPTION, leveldb::WriteOptions>) {
map[prefix + "sync"] = ToString(op.sync);
}
}};
add_options_to_map(options, current);
add_options_to_map(default_options, defaults);
}};
process_options(context.options, leveldb::Options(), "options.");
for (const auto& op : {&context.readoptions, &context.iteroptions}) process_options(*op, leveldb::ReadOptions(), "readoptions.");
for (const auto& op : {&context.writeoptions, &context.syncoptions}) process_options(*op, leveldb::WriteOptions(), "writeoptions.");
std::string result;
for (const auto& [key, current_value] : current) {
if (current_value != defaults[key]) {
if (result.size()) result += ", ";
result += key + "=" + current_value;
}
}
return result;
}
CDBWrapper::CDBWrapper(const DBParams& params)
: m_db_context{std::make_unique<LevelDBContext>()}, m_name{fs::PathToString(params.path.stem())}, m_path{params.path}, m_is_memory{params.memory_only}
{
@ -247,7 +290,7 @@ CDBWrapper::CDBWrapper(const DBParams& params)
// (see env_posix.cc and env_windows.cc).
leveldb::Status status = leveldb::DB::Open(DBContext().options, fs::PathToString(params.path), &DBContext().pdb);
HandleError(status);
LogPrintf("Opened LevelDB successfully\n");
LogInfo("Opened LevelDB successfully with options: %s", GetChangedOptions(DBContext()));
if (params.options.force_compact) {
LogPrintf("Starting database compaction of %s\n", fs::PathToString(params.path));