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rocksdb/options/options_helper.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "options/options_helper.h"
#include <cassert>
#include <cctype>
#include <cstdlib>
#include <unordered_set>
#include <vector>
#include "options/cf_options.h"
#include "options/db_options.h"
#include "rocksdb/cache.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/convenience.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/flush_block_policy.h"
#include "rocksdb/memtablerep.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/options.h"
#include "rocksdb/rate_limiter.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/table.h"
#include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/options_type.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
Status ValidateOptions(const DBOptions& db_opts,
const ColumnFamilyOptions& cf_opts) {
Status s;
#ifndef ROCKSDB_LITE
auto db_cfg = DBOptionsAsConfigurable(db_opts);
auto cf_cfg = CFOptionsAsConfigurable(cf_opts);
s = db_cfg->ValidateOptions(db_opts, cf_opts);
if (s.ok()) s = cf_cfg->ValidateOptions(db_opts, cf_opts);
#else
s = cf_opts.table_factory->ValidateOptions(db_opts, cf_opts);
#endif
return s;
}
DBOptions BuildDBOptions(const ImmutableDBOptions& immutable_db_options,
const MutableDBOptions& mutable_db_options) {
DBOptions options;
options.create_if_missing = immutable_db_options.create_if_missing;
options.create_missing_column_families =
immutable_db_options.create_missing_column_families;
options.error_if_exists = immutable_db_options.error_if_exists;
options.paranoid_checks = immutable_db_options.paranoid_checks;
options.env = immutable_db_options.env;
options.rate_limiter = immutable_db_options.rate_limiter;
options.sst_file_manager = immutable_db_options.sst_file_manager;
options.info_log = immutable_db_options.info_log;
options.info_log_level = immutable_db_options.info_log_level;
options.max_open_files = mutable_db_options.max_open_files;
options.max_file_opening_threads =
immutable_db_options.max_file_opening_threads;
options.max_total_wal_size = mutable_db_options.max_total_wal_size;
options.statistics = immutable_db_options.statistics;
options.use_fsync = immutable_db_options.use_fsync;
options.db_paths = immutable_db_options.db_paths;
options.db_log_dir = immutable_db_options.db_log_dir;
options.wal_dir = immutable_db_options.wal_dir;
options.delete_obsolete_files_period_micros =
mutable_db_options.delete_obsolete_files_period_micros;
options.max_background_jobs = mutable_db_options.max_background_jobs;
options.base_background_compactions =
mutable_db_options.base_background_compactions;
options.max_background_compactions =
mutable_db_options.max_background_compactions;
options.bytes_per_sync = mutable_db_options.bytes_per_sync;
options.wal_bytes_per_sync = mutable_db_options.wal_bytes_per_sync;
options.strict_bytes_per_sync = mutable_db_options.strict_bytes_per_sync;
options.max_subcompactions = mutable_db_options.max_subcompactions;
options.max_background_flushes = mutable_db_options.max_background_flushes;
options.max_log_file_size = immutable_db_options.max_log_file_size;
options.log_file_time_to_roll = immutable_db_options.log_file_time_to_roll;
options.keep_log_file_num = immutable_db_options.keep_log_file_num;
options.recycle_log_file_num = immutable_db_options.recycle_log_file_num;
options.max_manifest_file_size = immutable_db_options.max_manifest_file_size;
options.table_cache_numshardbits =
immutable_db_options.table_cache_numshardbits;
options.WAL_ttl_seconds = immutable_db_options.wal_ttl_seconds;
options.WAL_size_limit_MB = immutable_db_options.wal_size_limit_mb;
options.manifest_preallocation_size =
immutable_db_options.manifest_preallocation_size;
options.allow_mmap_reads = immutable_db_options.allow_mmap_reads;
options.allow_mmap_writes = immutable_db_options.allow_mmap_writes;
options.use_direct_reads = immutable_db_options.use_direct_reads;
options.use_direct_io_for_flush_and_compaction =
immutable_db_options.use_direct_io_for_flush_and_compaction;
options.allow_fallocate = immutable_db_options.allow_fallocate;
options.is_fd_close_on_exec = immutable_db_options.is_fd_close_on_exec;
options.stats_dump_period_sec = mutable_db_options.stats_dump_period_sec;
options.stats_persist_period_sec =
mutable_db_options.stats_persist_period_sec;
options.persist_stats_to_disk = immutable_db_options.persist_stats_to_disk;
options.stats_history_buffer_size =
mutable_db_options.stats_history_buffer_size;
options.advise_random_on_open = immutable_db_options.advise_random_on_open;
options.db_write_buffer_size = immutable_db_options.db_write_buffer_size;
options.write_buffer_manager = immutable_db_options.write_buffer_manager;
options.access_hint_on_compaction_start =
immutable_db_options.access_hint_on_compaction_start;
options.new_table_reader_for_compaction_inputs =
immutable_db_options.new_table_reader_for_compaction_inputs;
options.compaction_readahead_size =
mutable_db_options.compaction_readahead_size;
options.random_access_max_buffer_size =
immutable_db_options.random_access_max_buffer_size;
options.writable_file_max_buffer_size =
mutable_db_options.writable_file_max_buffer_size;
options.use_adaptive_mutex = immutable_db_options.use_adaptive_mutex;
options.listeners = immutable_db_options.listeners;
options.enable_thread_tracking = immutable_db_options.enable_thread_tracking;
options.delayed_write_rate = mutable_db_options.delayed_write_rate;
options.enable_pipelined_write = immutable_db_options.enable_pipelined_write;
options.unordered_write = immutable_db_options.unordered_write;
options.allow_concurrent_memtable_write =
immutable_db_options.allow_concurrent_memtable_write;
options.enable_write_thread_adaptive_yield =
immutable_db_options.enable_write_thread_adaptive_yield;
options.max_write_batch_group_size_bytes =
immutable_db_options.max_write_batch_group_size_bytes;
options.write_thread_max_yield_usec =
immutable_db_options.write_thread_max_yield_usec;
options.write_thread_slow_yield_usec =
immutable_db_options.write_thread_slow_yield_usec;
options.skip_stats_update_on_db_open =
immutable_db_options.skip_stats_update_on_db_open;
options.skip_checking_sst_file_sizes_on_db_open =
immutable_db_options.skip_checking_sst_file_sizes_on_db_open;
options.wal_recovery_mode = immutable_db_options.wal_recovery_mode;
options.allow_2pc = immutable_db_options.allow_2pc;
options.row_cache = immutable_db_options.row_cache;
#ifndef ROCKSDB_LITE
options.wal_filter = immutable_db_options.wal_filter;
#endif // ROCKSDB_LITE
options.fail_if_options_file_error =
immutable_db_options.fail_if_options_file_error;
options.dump_malloc_stats = immutable_db_options.dump_malloc_stats;
options.avoid_flush_during_recovery =
immutable_db_options.avoid_flush_during_recovery;
options.avoid_flush_during_shutdown =
mutable_db_options.avoid_flush_during_shutdown;
options.allow_ingest_behind =
immutable_db_options.allow_ingest_behind;
options.preserve_deletes =
immutable_db_options.preserve_deletes;
options.two_write_queues = immutable_db_options.two_write_queues;
options.manual_wal_flush = immutable_db_options.manual_wal_flush;
options.atomic_flush = immutable_db_options.atomic_flush;
options.avoid_unnecessary_blocking_io =
immutable_db_options.avoid_unnecessary_blocking_io;
options.log_readahead_size = immutable_db_options.log_readahead_size;
options.file_checksum_gen_factory =
immutable_db_options.file_checksum_gen_factory;
options.best_efforts_recovery = immutable_db_options.best_efforts_recovery;
options.max_bgerror_resume_count =
immutable_db_options.max_bgerror_resume_count;
options.bgerror_resume_retry_interval =
immutable_db_options.bgerror_resume_retry_interval;
return options;
}
ColumnFamilyOptions BuildColumnFamilyOptions(
const ColumnFamilyOptions& options,
const MutableCFOptions& mutable_cf_options) {
ColumnFamilyOptions cf_opts(options);
// Memtable related options
cf_opts.write_buffer_size = mutable_cf_options.write_buffer_size;
cf_opts.max_write_buffer_number = mutable_cf_options.max_write_buffer_number;
cf_opts.arena_block_size = mutable_cf_options.arena_block_size;
cf_opts.memtable_prefix_bloom_size_ratio =
mutable_cf_options.memtable_prefix_bloom_size_ratio;
cf_opts.memtable_whole_key_filtering =
mutable_cf_options.memtable_whole_key_filtering;
cf_opts.memtable_huge_page_size = mutable_cf_options.memtable_huge_page_size;
cf_opts.max_successive_merges = mutable_cf_options.max_successive_merges;
cf_opts.inplace_update_num_locks =
mutable_cf_options.inplace_update_num_locks;
cf_opts.prefix_extractor = mutable_cf_options.prefix_extractor;
// Compaction related options
cf_opts.disable_auto_compactions =
mutable_cf_options.disable_auto_compactions;
cf_opts.soft_pending_compaction_bytes_limit =
mutable_cf_options.soft_pending_compaction_bytes_limit;
cf_opts.hard_pending_compaction_bytes_limit =
mutable_cf_options.hard_pending_compaction_bytes_limit;
cf_opts.level0_file_num_compaction_trigger =
mutable_cf_options.level0_file_num_compaction_trigger;
cf_opts.level0_slowdown_writes_trigger =
mutable_cf_options.level0_slowdown_writes_trigger;
cf_opts.level0_stop_writes_trigger =
mutable_cf_options.level0_stop_writes_trigger;
cf_opts.max_compaction_bytes = mutable_cf_options.max_compaction_bytes;
cf_opts.target_file_size_base = mutable_cf_options.target_file_size_base;
cf_opts.target_file_size_multiplier =
mutable_cf_options.target_file_size_multiplier;
cf_opts.max_bytes_for_level_base =
mutable_cf_options.max_bytes_for_level_base;
cf_opts.max_bytes_for_level_multiplier =
mutable_cf_options.max_bytes_for_level_multiplier;
cf_opts.ttl = mutable_cf_options.ttl;
cf_opts.periodic_compaction_seconds =
mutable_cf_options.periodic_compaction_seconds;
cf_opts.max_bytes_for_level_multiplier_additional.clear();
for (auto value :
mutable_cf_options.max_bytes_for_level_multiplier_additional) {
cf_opts.max_bytes_for_level_multiplier_additional.emplace_back(value);
}
cf_opts.compaction_options_fifo = mutable_cf_options.compaction_options_fifo;
cf_opts.compaction_options_universal =
mutable_cf_options.compaction_options_universal;
// Blob file related options
cf_opts.enable_blob_files = mutable_cf_options.enable_blob_files;
cf_opts.min_blob_size = mutable_cf_options.min_blob_size;
cf_opts.blob_file_size = mutable_cf_options.blob_file_size;
cf_opts.blob_compression_type = mutable_cf_options.blob_compression_type;
// Misc options
cf_opts.max_sequential_skip_in_iterations =
mutable_cf_options.max_sequential_skip_in_iterations;
cf_opts.check_flush_compaction_key_order =
mutable_cf_options.check_flush_compaction_key_order;
cf_opts.paranoid_file_checks = mutable_cf_options.paranoid_file_checks;
cf_opts.report_bg_io_stats = mutable_cf_options.report_bg_io_stats;
cf_opts.compression = mutable_cf_options.compression;
cf_opts.compression_opts = mutable_cf_options.compression_opts;
cf_opts.bottommost_compression = mutable_cf_options.bottommost_compression;
cf_opts.bottommost_compression_opts =
mutable_cf_options.bottommost_compression_opts;
cf_opts.sample_for_compression = mutable_cf_options.sample_for_compression;
cf_opts.table_factory = options.table_factory;
// TODO(yhchiang): find some way to handle the following derived options
// * max_file_size
return cf_opts;
}
std::map<CompactionStyle, std::string>
OptionsHelper::compaction_style_to_string = {
{kCompactionStyleLevel, "kCompactionStyleLevel"},
{kCompactionStyleUniversal, "kCompactionStyleUniversal"},
{kCompactionStyleFIFO, "kCompactionStyleFIFO"},
{kCompactionStyleNone, "kCompactionStyleNone"}};
std::map<CompactionPri, std::string> OptionsHelper::compaction_pri_to_string = {
{kByCompensatedSize, "kByCompensatedSize"},
{kOldestLargestSeqFirst, "kOldestLargestSeqFirst"},
{kOldestSmallestSeqFirst, "kOldestSmallestSeqFirst"},
{kMinOverlappingRatio, "kMinOverlappingRatio"}};
std::map<CompactionStopStyle, std::string>
OptionsHelper::compaction_stop_style_to_string = {
{kCompactionStopStyleSimilarSize, "kCompactionStopStyleSimilarSize"},
{kCompactionStopStyleTotalSize, "kCompactionStopStyleTotalSize"}};
std::unordered_map<std::string, ChecksumType>
OptionsHelper::checksum_type_string_map = {{"kNoChecksum", kNoChecksum},
{"kCRC32c", kCRC32c},
{"kxxHash", kxxHash},
{"kxxHash64", kxxHash64}};
std::unordered_map<std::string, CompressionType>
OptionsHelper::compression_type_string_map = {
{"kNoCompression", kNoCompression},
{"kSnappyCompression", kSnappyCompression},
{"kZlibCompression", kZlibCompression},
{"kBZip2Compression", kBZip2Compression},
{"kLZ4Compression", kLZ4Compression},
{"kLZ4HCCompression", kLZ4HCCompression},
{"kXpressCompression", kXpressCompression},
{"kZSTD", kZSTD},
{"kZSTDNotFinalCompression", kZSTDNotFinalCompression},
{"kDisableCompressionOption", kDisableCompressionOption}};
std::vector<CompressionType> GetSupportedCompressions() {
std::vector<CompressionType> supported_compressions;
for (const auto& comp_to_name : OptionsHelper::compression_type_string_map) {
CompressionType t = comp_to_name.second;
if (t != kDisableCompressionOption && CompressionTypeSupported(t)) {
supported_compressions.push_back(t);
}
}
return supported_compressions;
}
#ifndef ROCKSDB_LITE
bool ParseSliceTransformHelper(
const std::string& kFixedPrefixName, const std::string& kCappedPrefixName,
const std::string& value,
std::shared_ptr<const SliceTransform>* slice_transform) {
const char* no_op_name = "rocksdb.Noop";
size_t no_op_length = strlen(no_op_name);
auto& pe_value = value;
if (pe_value.size() > kFixedPrefixName.size() &&
pe_value.compare(0, kFixedPrefixName.size(), kFixedPrefixName) == 0) {
int prefix_length = ParseInt(trim(value.substr(kFixedPrefixName.size())));
slice_transform->reset(NewFixedPrefixTransform(prefix_length));
} else if (pe_value.size() > kCappedPrefixName.size() &&
pe_value.compare(0, kCappedPrefixName.size(), kCappedPrefixName) ==
0) {
int prefix_length =
ParseInt(trim(pe_value.substr(kCappedPrefixName.size())));
slice_transform->reset(NewCappedPrefixTransform(prefix_length));
} else if (pe_value.size() == no_op_length &&
pe_value.compare(0, no_op_length, no_op_name) == 0) {
const SliceTransform* no_op_transform = NewNoopTransform();
slice_transform->reset(no_op_transform);
} else if (value == kNullptrString) {
slice_transform->reset();
} else {
return false;
}
return true;
}
bool ParseSliceTransform(
const std::string& value,
std::shared_ptr<const SliceTransform>* slice_transform) {
// While we normally don't convert the string representation of a
// pointer-typed option into its instance, here we do so for backward
// compatibility as we allow this action in SetOption().
// TODO(yhchiang): A possible better place for these serialization /
// deserialization is inside the class definition of pointer-typed
// option itself, but this requires a bigger change of public API.
bool result =
ParseSliceTransformHelper("fixed:", "capped:", value, slice_transform);
if (result) {
return result;
}
result = ParseSliceTransformHelper(
"rocksdb.FixedPrefix.", "rocksdb.CappedPrefix.", value, slice_transform);
if (result) {
return result;
}
// TODO(yhchiang): we can further support other default
// SliceTransforms here.
return false;
}
static bool ParseOptionHelper(char* opt_address, const OptionType& opt_type,
const std::string& value) {
switch (opt_type) {
case OptionType::kBoolean:
*reinterpret_cast<bool*>(opt_address) = ParseBoolean("", value);
break;
case OptionType::kInt:
*reinterpret_cast<int*>(opt_address) = ParseInt(value);
break;
case OptionType::kInt32T:
*reinterpret_cast<int32_t*>(opt_address) = ParseInt32(value);
break;
case OptionType::kInt64T:
PutUnaligned(reinterpret_cast<int64_t*>(opt_address), ParseInt64(value));
break;
case OptionType::kUInt:
*reinterpret_cast<unsigned int*>(opt_address) = ParseUint32(value);
break;
case OptionType::kUInt32T:
*reinterpret_cast<uint32_t*>(opt_address) = ParseUint32(value);
break;
case OptionType::kUInt64T:
PutUnaligned(reinterpret_cast<uint64_t*>(opt_address), ParseUint64(value));
break;
case OptionType::kSizeT:
PutUnaligned(reinterpret_cast<size_t*>(opt_address), ParseSizeT(value));
break;
case OptionType::kString:
*reinterpret_cast<std::string*>(opt_address) = value;
break;
case OptionType::kDouble:
*reinterpret_cast<double*>(opt_address) = ParseDouble(value);
break;
case OptionType::kCompactionStyle:
return ParseEnum<CompactionStyle>(
compaction_style_string_map, value,
reinterpret_cast<CompactionStyle*>(opt_address));
case OptionType::kCompactionPri:
return ParseEnum<CompactionPri>(
compaction_pri_string_map, value,
reinterpret_cast<CompactionPri*>(opt_address));
case OptionType::kCompressionType:
return ParseEnum<CompressionType>(
compression_type_string_map, value,
reinterpret_cast<CompressionType*>(opt_address));
case OptionType::kSliceTransform:
return ParseSliceTransform(
value, reinterpret_cast<std::shared_ptr<const SliceTransform>*>(
opt_address));
case OptionType::kChecksumType:
return ParseEnum<ChecksumType>(
checksum_type_string_map, value,
reinterpret_cast<ChecksumType*>(opt_address));
case OptionType::kEncodingType:
return ParseEnum<EncodingType>(
encoding_type_string_map, value,
reinterpret_cast<EncodingType*>(opt_address));
case OptionType::kCompactionStopStyle:
return ParseEnum<CompactionStopStyle>(
compaction_stop_style_string_map, value,
reinterpret_cast<CompactionStopStyle*>(opt_address));
default:
return false;
}
return true;
}
bool SerializeSingleOptionHelper(const char* opt_address,
const OptionType opt_type,
std::string* value) {
assert(value);
switch (opt_type) {
case OptionType::kBoolean:
*value = *(reinterpret_cast<const bool*>(opt_address)) ? "true" : "false";
break;
case OptionType::kInt:
*value = ToString(*(reinterpret_cast<const int*>(opt_address)));
break;
case OptionType::kInt32T:
*value = ToString(*(reinterpret_cast<const int32_t*>(opt_address)));
break;
case OptionType::kInt64T:
{
int64_t v;
GetUnaligned(reinterpret_cast<const int64_t*>(opt_address), &v);
*value = ToString(v);
}
break;
case OptionType::kUInt:
*value = ToString(*(reinterpret_cast<const unsigned int*>(opt_address)));
break;
case OptionType::kUInt32T:
*value = ToString(*(reinterpret_cast<const uint32_t*>(opt_address)));
break;
case OptionType::kUInt64T:
{
uint64_t v;
GetUnaligned(reinterpret_cast<const uint64_t*>(opt_address), &v);
*value = ToString(v);
}
break;
case OptionType::kSizeT:
{
size_t v;
GetUnaligned(reinterpret_cast<const size_t*>(opt_address), &v);
*value = ToString(v);
}
break;
case OptionType::kDouble:
*value = ToString(*(reinterpret_cast<const double*>(opt_address)));
break;
case OptionType::kString:
*value = EscapeOptionString(
*(reinterpret_cast<const std::string*>(opt_address)));
break;
case OptionType::kCompactionStyle:
return SerializeEnum<CompactionStyle>(
compaction_style_string_map,
*(reinterpret_cast<const CompactionStyle*>(opt_address)), value);
case OptionType::kCompactionPri:
return SerializeEnum<CompactionPri>(
compaction_pri_string_map,
*(reinterpret_cast<const CompactionPri*>(opt_address)), value);
case OptionType::kCompressionType:
return SerializeEnum<CompressionType>(
compression_type_string_map,
*(reinterpret_cast<const CompressionType*>(opt_address)), value);
case OptionType::kSliceTransform: {
const auto* slice_transform_ptr =
reinterpret_cast<const std::shared_ptr<const SliceTransform>*>(
opt_address);
*value = slice_transform_ptr->get() ? slice_transform_ptr->get()->Name()
: kNullptrString;
break;
}
case OptionType::kComparator: {
// it's a const pointer of const Comparator*
const auto* ptr = reinterpret_cast<const Comparator* const*>(opt_address);
// Since the user-specified comparator will be wrapped by
// InternalKeyComparator, we should persist the user-specified one
// instead of InternalKeyComparator.
if (*ptr == nullptr) {
*value = kNullptrString;
} else {
const Comparator* root_comp = (*ptr)->GetRootComparator();
if (root_comp == nullptr) {
root_comp = (*ptr);
}
*value = root_comp->Name();
}
break;
}
case OptionType::kCompactionFilter: {
// it's a const pointer of const CompactionFilter*
const auto* ptr =
reinterpret_cast<const CompactionFilter* const*>(opt_address);
*value = *ptr ? (*ptr)->Name() : kNullptrString;
break;
}
case OptionType::kCompactionFilterFactory: {
const auto* ptr =
reinterpret_cast<const std::shared_ptr<CompactionFilterFactory>*>(
opt_address);
*value = ptr->get() ? ptr->get()->Name() : kNullptrString;
break;
}
case OptionType::kMemTableRepFactory: {
const auto* ptr =
reinterpret_cast<const std::shared_ptr<MemTableRepFactory>*>(
opt_address);
*value = ptr->get() ? ptr->get()->Name() : kNullptrString;
break;
}
case OptionType::kMergeOperator: {
const auto* ptr =
reinterpret_cast<const std::shared_ptr<MergeOperator>*>(opt_address);
*value = ptr->get() ? ptr->get()->Name() : kNullptrString;
break;
}
case OptionType::kFilterPolicy: {
const auto* ptr =
reinterpret_cast<const std::shared_ptr<FilterPolicy>*>(opt_address);
*value = ptr->get() ? ptr->get()->Name() : kNullptrString;
break;
}
case OptionType::kChecksumType:
return SerializeEnum<ChecksumType>(
checksum_type_string_map,
*reinterpret_cast<const ChecksumType*>(opt_address), value);
case OptionType::kFlushBlockPolicyFactory: {
const auto* ptr =
reinterpret_cast<const std::shared_ptr<FlushBlockPolicyFactory>*>(
opt_address);
*value = ptr->get() ? ptr->get()->Name() : kNullptrString;
break;
}
case OptionType::kEncodingType:
return SerializeEnum<EncodingType>(
encoding_type_string_map,
*reinterpret_cast<const EncodingType*>(opt_address), value);
case OptionType::kCompactionStopStyle:
return SerializeEnum<CompactionStopStyle>(
compaction_stop_style_string_map,
*reinterpret_cast<const CompactionStopStyle*>(opt_address), value);
default:
return false;
}
return true;
}
template <typename T>
Status ConfigureFromMap(
const ConfigOptions& config_options,
const std::unordered_map<std::string, std::string>& opt_map,
const std::string& option_name, Configurable* config, T* new_opts) {
Status s = config->ConfigureFromMap(config_options, opt_map);
if (s.ok()) {
*new_opts = *(config->GetOptions<T>(option_name));
}
return s;
}
Status GetMutableOptionsFromStrings(
const MutableCFOptions& base_options,
const std::unordered_map<std::string, std::string>& options_map,
Logger* /*info_log*/, MutableCFOptions* new_options) {
assert(new_options);
*new_options = base_options;
ConfigOptions config_options;
const auto config = CFOptionsAsConfigurable(base_options);
return ConfigureFromMap<MutableCFOptions>(config_options, options_map,
MutableCFOptions::kName(),
config.get(), new_options);
}
Status GetMutableDBOptionsFromStrings(
const MutableDBOptions& base_options,
const std::unordered_map<std::string, std::string>& options_map,
MutableDBOptions* new_options) {
assert(new_options);
*new_options = base_options;
ConfigOptions config_options;
auto config = DBOptionsAsConfigurable(base_options);
return ConfigureFromMap<MutableDBOptions>(config_options, options_map,
MutableDBOptions::kName(),
config.get(), new_options);
}
Status StringToMap(const std::string& opts_str,
std::unordered_map<std::string, std::string>* opts_map) {
assert(opts_map);
// Example:
// opts_str = "write_buffer_size=1024;max_write_buffer_number=2;"
// "nested_opt={opt1=1;opt2=2};max_bytes_for_level_base=100"
size_t pos = 0;
std::string opts = trim(opts_str);
// If the input string starts and ends with "{...}", strip off the brackets
while (opts.size() > 2 && opts[0] == '{' && opts[opts.size() - 1] == '}') {
opts = trim(opts.substr(1, opts.size() - 2));
}
while (pos < opts.size()) {
size_t eq_pos = opts.find('=', pos);
if (eq_pos == std::string::npos) {
return Status::InvalidArgument("Mismatched key value pair, '=' expected");
}
std::string key = trim(opts.substr(pos, eq_pos - pos));
if (key.empty()) {
return Status::InvalidArgument("Empty key found");
}
std::string value;
Status s = OptionTypeInfo::NextToken(opts, ';', eq_pos + 1, &pos, &value);
if (!s.ok()) {
return s;
} else {
(*opts_map)[key] = value;
if (pos == std::string::npos) {
break;
} else {
pos++;
}
}
}
return Status::OK();
}
Status GetStringFromMutableDBOptions(const ConfigOptions& config_options,
const MutableDBOptions& mutable_opts,
std::string* opt_string) {
auto config = DBOptionsAsConfigurable(mutable_opts);
return config->GetOptionString(config_options, opt_string);
}
Status GetStringFromDBOptions(std::string* opt_string,
const DBOptions& db_options,
const std::string& delimiter) {
ConfigOptions config_options;
config_options.delimiter = delimiter;
return GetStringFromDBOptions(config_options, db_options, opt_string);
}
Status GetStringFromDBOptions(const ConfigOptions& config_options,
const DBOptions& db_options,
std::string* opt_string) {
assert(opt_string);
opt_string->clear();
auto config = DBOptionsAsConfigurable(db_options);
return config->GetOptionString(config_options, opt_string);
}
Status GetStringFromMutableCFOptions(const ConfigOptions& config_options,
const MutableCFOptions& mutable_opts,
std::string* opt_string) {
assert(opt_string);
opt_string->clear();
const auto config = CFOptionsAsConfigurable(mutable_opts);
return config->GetOptionString(config_options, opt_string);
}
Status GetStringFromColumnFamilyOptions(std::string* opt_string,
const ColumnFamilyOptions& cf_options,
const std::string& delimiter) {
ConfigOptions config_options;
config_options.delimiter = delimiter;
return GetStringFromColumnFamilyOptions(config_options, cf_options,
opt_string);
}
Status GetStringFromColumnFamilyOptions(const ConfigOptions& config_options,
const ColumnFamilyOptions& cf_options,
std::string* opt_string) {
const auto config = CFOptionsAsConfigurable(cf_options);
return config->GetOptionString(config_options, opt_string);
}
Status GetStringFromCompressionType(std::string* compression_str,
CompressionType compression_type) {
bool ok = SerializeEnum<CompressionType>(compression_type_string_map,
compression_type, compression_str);
if (ok) {
return Status::OK();
} else {
return Status::InvalidArgument("Invalid compression types");
}
}
Status GetColumnFamilyOptionsFromMap(
const ColumnFamilyOptions& base_options,
const std::unordered_map<std::string, std::string>& opts_map,
ColumnFamilyOptions* new_options, bool input_strings_escaped,
bool ignore_unknown_options) {
ConfigOptions config_options;
config_options.ignore_unknown_options = ignore_unknown_options;
config_options.input_strings_escaped = input_strings_escaped;
return GetColumnFamilyOptionsFromMap(config_options, base_options, opts_map,
new_options);
}
Status GetColumnFamilyOptionsFromMap(
const ConfigOptions& config_options,
const ColumnFamilyOptions& base_options,
const std::unordered_map<std::string, std::string>& opts_map,
ColumnFamilyOptions* new_options) {
assert(new_options);
*new_options = base_options;
const auto config = CFOptionsAsConfigurable(base_options);
return ConfigureFromMap<ColumnFamilyOptions>(config_options, opts_map,
OptionsHelper::kCFOptionsName,
config.get(), new_options);
}
Status GetColumnFamilyOptionsFromString(
const ColumnFamilyOptions& base_options,
const std::string& opts_str,
ColumnFamilyOptions* new_options) {
ConfigOptions config_options;
config_options.input_strings_escaped = false;
config_options.ignore_unknown_options = false;
return GetColumnFamilyOptionsFromString(config_options, base_options,
opts_str, new_options);
}
Status GetColumnFamilyOptionsFromString(const ConfigOptions& config_options,
const ColumnFamilyOptions& base_options,
const std::string& opts_str,
ColumnFamilyOptions* new_options) {
std::unordered_map<std::string, std::string> opts_map;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
*new_options = base_options;
return s;
}
return GetColumnFamilyOptionsFromMap(config_options, base_options, opts_map,
new_options);
}
Status GetDBOptionsFromMap(
const DBOptions& base_options,
const std::unordered_map<std::string, std::string>& opts_map,
DBOptions* new_options, bool input_strings_escaped,
bool ignore_unknown_options) {
ConfigOptions config_options;
config_options.input_strings_escaped = input_strings_escaped;
config_options.ignore_unknown_options = ignore_unknown_options;
return GetDBOptionsFromMap(config_options, base_options, opts_map,
new_options);
}
Status GetDBOptionsFromMap(
const ConfigOptions& config_options, const DBOptions& base_options,
const std::unordered_map<std::string, std::string>& opts_map,
DBOptions* new_options) {
assert(new_options);
*new_options = base_options;
auto config = DBOptionsAsConfigurable(base_options);
return ConfigureFromMap<DBOptions>(config_options, opts_map,
OptionsHelper::kDBOptionsName,
config.get(), new_options);
}
Status GetDBOptionsFromString(const DBOptions& base_options,
const std::string& opts_str,
DBOptions* new_options) {
ConfigOptions config_options;
config_options.input_strings_escaped = false;
config_options.ignore_unknown_options = false;
return GetDBOptionsFromString(config_options, base_options, opts_str,
new_options);
}
Status GetDBOptionsFromString(const ConfigOptions& config_options,
const DBOptions& base_options,
const std::string& opts_str,
DBOptions* new_options) {
std::unordered_map<std::string, std::string> opts_map;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
*new_options = base_options;
return s;
}
return GetDBOptionsFromMap(config_options, base_options, opts_map,
new_options);
}
Status GetOptionsFromString(const Options& base_options,
const std::string& opts_str, Options* new_options) {
ConfigOptions config_options;
config_options.input_strings_escaped = false;
config_options.ignore_unknown_options = false;
return GetOptionsFromString(config_options, base_options, opts_str,
new_options);
}
Status GetOptionsFromString(const ConfigOptions& config_options,
const Options& base_options,
const std::string& opts_str, Options* new_options) {
ColumnFamilyOptions new_cf_options;
std::unordered_map<std::string, std::string> unused_opts;
std::unordered_map<std::string, std::string> opts_map;
*new_options = base_options;
Status s = StringToMap(opts_str, &opts_map);
if (!s.ok()) {
return s;
}
auto config = DBOptionsAsConfigurable(base_options);
s = config->ConfigureFromMap(config_options, opts_map, &unused_opts);
if (s.ok()) {
DBOptions* new_db_options =
config->GetOptions<DBOptions>(OptionsHelper::kDBOptionsName);
if (!unused_opts.empty()) {
s = GetColumnFamilyOptionsFromMap(config_options, base_options,
unused_opts, &new_cf_options);
if (s.ok()) {
*new_options = Options(*new_db_options, new_cf_options);
}
} else {
*new_options = Options(*new_db_options, base_options);
}
}
return s;
}
std::unordered_map<std::string, EncodingType>
OptionsHelper::encoding_type_string_map = {{"kPlain", kPlain},
{"kPrefix", kPrefix}};
std::unordered_map<std::string, CompactionStyle>
OptionsHelper::compaction_style_string_map = {
{"kCompactionStyleLevel", kCompactionStyleLevel},
{"kCompactionStyleUniversal", kCompactionStyleUniversal},
{"kCompactionStyleFIFO", kCompactionStyleFIFO},
{"kCompactionStyleNone", kCompactionStyleNone}};
std::unordered_map<std::string, CompactionPri>
OptionsHelper::compaction_pri_string_map = {
{"kByCompensatedSize", kByCompensatedSize},
{"kOldestLargestSeqFirst", kOldestLargestSeqFirst},
{"kOldestSmallestSeqFirst", kOldestSmallestSeqFirst},
{"kMinOverlappingRatio", kMinOverlappingRatio}};
std::unordered_map<std::string, CompactionStopStyle>
OptionsHelper::compaction_stop_style_string_map = {
{"kCompactionStopStyleSimilarSize", kCompactionStopStyleSimilarSize},
{"kCompactionStopStyleTotalSize", kCompactionStopStyleTotalSize}};
Status OptionTypeInfo::NextToken(const std::string& opts, char delimiter,
size_t pos, size_t* end, std::string* token) {
while (pos < opts.size() && isspace(opts[pos])) {
++pos;
}
// Empty value at the end
if (pos >= opts.size()) {
*token = "";
*end = std::string::npos;
return Status::OK();
} else if (opts[pos] == '{') {
int count = 1;
size_t brace_pos = pos + 1;
while (brace_pos < opts.size()) {
if (opts[brace_pos] == '{') {
++count;
} else if (opts[brace_pos] == '}') {
--count;
if (count == 0) {
break;
}
}
++brace_pos;
}
// found the matching closing brace
if (count == 0) {
*token = trim(opts.substr(pos + 1, brace_pos - pos - 1));
// skip all whitespace and move to the next delimiter
// brace_pos points to the next position after the matching '}'
pos = brace_pos + 1;
while (pos < opts.size() && isspace(opts[pos])) {
++pos;
}
if (pos < opts.size() && opts[pos] != delimiter) {
return Status::InvalidArgument("Unexpected chars after nested options");
}
*end = pos;
} else {
return Status::InvalidArgument(
"Mismatched curly braces for nested options");
}
} else {
*end = opts.find(delimiter, pos);
if (*end == std::string::npos) {
// It either ends with a trailing semi-colon or the last key-value pair
*token = trim(opts.substr(pos));
} else {
*token = trim(opts.substr(pos, *end - pos));
}
}
return Status::OK();
}
Status OptionTypeInfo::Parse(const ConfigOptions& config_options,
const std::string& opt_name,
const std::string& value, void* opt_ptr) const {
if (IsDeprecated()) {
return Status::OK();
}
try {
char* opt_addr = reinterpret_cast<char*>(opt_ptr) + offset_;
const std::string& opt_value = config_options.input_strings_escaped
? UnescapeOptionString(value)
: value;
if (opt_addr == nullptr) {
return Status::NotFound("Could not find option", opt_name);
} else if (parse_func_ != nullptr) {
ConfigOptions copy = config_options;
copy.invoke_prepare_options = false;
return parse_func_(copy, opt_name, opt_value, opt_addr);
} else if (ParseOptionHelper(opt_addr, type_, opt_value)) {
return Status::OK();
} else if (IsConfigurable()) {
// The option is <config>.<name>
Configurable* config = AsRawPointer<Configurable>(opt_ptr);
if (opt_value.empty()) {
return Status::OK();
} else if (config == nullptr) {
return Status::NotFound("Could not find configurable: ", opt_name);
} else {
ConfigOptions copy = config_options;
copy.ignore_unknown_options = false;
copy.invoke_prepare_options = false;
if (opt_value.find("=") != std::string::npos) {
return config->ConfigureFromString(copy, opt_value);
} else {
return config->ConfigureOption(copy, opt_name, opt_value);
}
}
} else if (IsByName()) {
return Status::NotSupported("Deserializing the option " + opt_name +
" is not supported");
} else {
return Status::InvalidArgument("Error parsing:", opt_name);
}
} catch (std::exception& e) {
return Status::InvalidArgument("Error parsing " + opt_name + ":" +
std::string(e.what()));
}
}
Status OptionTypeInfo::ParseStruct(
const ConfigOptions& config_options, const std::string& struct_name,
const std::unordered_map<std::string, OptionTypeInfo>* struct_map,
const std::string& opt_name, const std::string& opt_value, char* opt_addr) {
assert(struct_map);
Status status;
if (opt_name == struct_name || EndsWith(opt_name, "." + struct_name)) {
// This option represents the entire struct
std::unordered_map<std::string, std::string> opt_map;
status = StringToMap(opt_value, &opt_map);
for (const auto& map_iter : opt_map) {
if (!status.ok()) {
break;
}
const auto iter = struct_map->find(map_iter.first);
if (iter != struct_map->end()) {
status = iter->second.Parse(config_options, map_iter.first,
map_iter.second, opt_addr);
} else {
status = Status::InvalidArgument("Unrecognized option",
struct_name + "." + map_iter.first);
}
}
} else if (StartsWith(opt_name, struct_name + ".")) {
// This option represents a nested field in the struct (e.g, struct.field)
std::string elem_name;
const auto opt_info =
Find(opt_name.substr(struct_name.size() + 1), *struct_map, &elem_name);
if (opt_info != nullptr) {
status = opt_info->Parse(config_options, elem_name, opt_value, opt_addr);
} else {
status = Status::InvalidArgument("Unrecognized option", opt_name);
}
} else {
// This option represents a field in the struct (e.g. field)
std::string elem_name;
const auto opt_info = Find(opt_name, *struct_map, &elem_name);
if (opt_info != nullptr) {
status = opt_info->Parse(config_options, elem_name, opt_value, opt_addr);
} else {
status = Status::InvalidArgument("Unrecognized option",
struct_name + "." + opt_name);
}
}
return status;
}
Status OptionTypeInfo::Serialize(const ConfigOptions& config_options,
const std::string& opt_name,
const void* const opt_ptr,
std::string* opt_value) const {
// If the option is no longer used in rocksdb and marked as deprecated,
// we skip it in the serialization.
const char* opt_addr = reinterpret_cast<const char*>(opt_ptr) + offset_;
if (opt_addr == nullptr || IsDeprecated()) {
return Status::OK();
} else if (IsEnabled(OptionTypeFlags::kDontSerialize)) {
return Status::NotSupported("Cannot serialize option: ", opt_name);
} else if (serialize_func_ != nullptr) {
return serialize_func_(config_options, opt_name, opt_addr, opt_value);
} else if (SerializeSingleOptionHelper(opt_addr, type_, opt_value)) {
return Status::OK();
} else if (IsConfigurable()) {
const Configurable* config = AsRawPointer<Configurable>(opt_ptr);
if (config != nullptr) {
ConfigOptions embedded = config_options;
embedded.delimiter = ";";
*opt_value = config->ToString(embedded);
}
return Status::OK();
} else {
return Status::InvalidArgument("Cannot serialize option: ", opt_name);
}
}
Status OptionTypeInfo::SerializeStruct(
const ConfigOptions& config_options, const std::string& struct_name,
const std::unordered_map<std::string, OptionTypeInfo>* struct_map,
const std::string& opt_name, const char* opt_addr, std::string* value) {
assert(struct_map);
Status status;
if (EndsWith(opt_name, struct_name)) {
// We are going to write the struct as "{ prop1=value1; prop2=value2;}.
// Set the delimiter to ";" so that the everything will be on one line.
ConfigOptions embedded = config_options;
embedded.delimiter = ";";
// This option represents the entire struct
std::string result;
for (const auto& iter : *struct_map) {
std::string single;
const auto& opt_info = iter.second;
if (opt_info.ShouldSerialize()) {
status = opt_info.Serialize(embedded, iter.first, opt_addr, &single);
if (!status.ok()) {
return status;
} else {
result.append(iter.first + "=" + single + embedded.delimiter);
}
}
}
*value = "{" + result + "}";
} else if (StartsWith(opt_name, struct_name + ".")) {
// This option represents a nested field in the struct (e.g, struct.field)
std::string elem_name;
const auto opt_info =
Find(opt_name.substr(struct_name.size() + 1), *struct_map, &elem_name);
if (opt_info != nullptr) {
status = opt_info->Serialize(config_options, elem_name, opt_addr, value);
} else {
status = Status::InvalidArgument("Unrecognized option", opt_name);
}
} else {
// This option represents a field in the struct (e.g. field)
std::string elem_name;
const auto opt_info = Find(opt_name, *struct_map, &elem_name);
if (opt_info == nullptr) {
status = Status::InvalidArgument("Unrecognized option", opt_name);
} else if (opt_info->ShouldSerialize()) {
status = opt_info->Serialize(config_options, opt_name + "." + elem_name,
opt_addr, value);
}
}
return status;
}
template <typename T>
bool IsOptionEqual(const char* offset1, const char* offset2) {
return (*reinterpret_cast<const T*>(offset1) ==
*reinterpret_cast<const T*>(offset2));
}
static bool AreEqualDoubles(const double a, const double b) {
return (fabs(a - b) < 0.00001);
}
static bool AreOptionsEqual(OptionType type, const char* this_offset,
const char* that_offset) {
switch (type) {
case OptionType::kBoolean:
return IsOptionEqual<bool>(this_offset, that_offset);
case OptionType::kInt:
return IsOptionEqual<int>(this_offset, that_offset);
case OptionType::kUInt:
return IsOptionEqual<unsigned int>(this_offset, that_offset);
case OptionType::kInt32T:
return IsOptionEqual<int32_t>(this_offset, that_offset);
case OptionType::kInt64T: {
int64_t v1, v2;
GetUnaligned(reinterpret_cast<const int64_t*>(this_offset), &v1);
GetUnaligned(reinterpret_cast<const int64_t*>(that_offset), &v2);
return (v1 == v2);
}
case OptionType::kUInt32T:
return IsOptionEqual<uint32_t>(this_offset, that_offset);
case OptionType::kUInt64T: {
uint64_t v1, v2;
GetUnaligned(reinterpret_cast<const uint64_t*>(this_offset), &v1);
GetUnaligned(reinterpret_cast<const uint64_t*>(that_offset), &v2);
return (v1 == v2);
}
case OptionType::kSizeT: {
size_t v1, v2;
GetUnaligned(reinterpret_cast<const size_t*>(this_offset), &v1);
GetUnaligned(reinterpret_cast<const size_t*>(that_offset), &v2);
return (v1 == v2);
}
case OptionType::kString:
return IsOptionEqual<std::string>(this_offset, that_offset);
case OptionType::kDouble:
return AreEqualDoubles(*reinterpret_cast<const double*>(this_offset),
*reinterpret_cast<const double*>(that_offset));
case OptionType::kCompactionStyle:
return IsOptionEqual<CompactionStyle>(this_offset, that_offset);
case OptionType::kCompactionStopStyle:
return IsOptionEqual<CompactionStopStyle>(this_offset, that_offset);
case OptionType::kCompactionPri:
return IsOptionEqual<CompactionPri>(this_offset, that_offset);
case OptionType::kCompressionType:
return IsOptionEqual<CompressionType>(this_offset, that_offset);
case OptionType::kChecksumType:
return IsOptionEqual<ChecksumType>(this_offset, that_offset);
case OptionType::kEncodingType:
return IsOptionEqual<EncodingType>(this_offset, that_offset);
default:
return false;
} // End switch
}
bool OptionTypeInfo::AreEqual(const ConfigOptions& config_options,
const std::string& opt_name,
const void* const this_ptr,
const void* const that_ptr,
std::string* mismatch) const {
auto level = GetSanityLevel();
if (!config_options.IsCheckEnabled(level)) {
return true; // If the sanity level is not being checked, skip it
}
const auto this_addr = reinterpret_cast<const char*>(this_ptr) + offset_;
const auto that_addr = reinterpret_cast<const char*>(that_ptr) + offset_;
if (this_addr == nullptr || that_addr == nullptr) {
if (this_addr == that_addr) {
return true;
}
} else if (equals_func_ != nullptr) {
if (equals_func_(config_options, opt_name, this_addr, that_addr,
mismatch)) {
return true;
}
} else if (AreOptionsEqual(type_, this_addr, that_addr)) {
return true;
} else if (IsConfigurable()) {
const auto* this_config = AsRawPointer<Configurable>(this_ptr);
const auto* that_config = AsRawPointer<Configurable>(that_ptr);
if (this_config == that_config) {
return true;
} else if (this_config != nullptr && that_config != nullptr) {
std::string bad_name;
bool matches;
if (level < config_options.sanity_level) {
ConfigOptions copy = config_options;
copy.sanity_level = level;
matches = this_config->AreEquivalent(copy, that_config, &bad_name);
} else {
matches =
this_config->AreEquivalent(config_options, that_config, &bad_name);
}
if (!matches) {
*mismatch = opt_name + "." + bad_name;
}
return matches;
}
}
if (mismatch->empty()) {
*mismatch = opt_name;
}
return false;
}
bool OptionTypeInfo::StructsAreEqual(
const ConfigOptions& config_options, const std::string& struct_name,
const std::unordered_map<std::string, OptionTypeInfo>* struct_map,
const std::string& opt_name, const char* this_addr, const char* that_addr,
std::string* mismatch) {
assert(struct_map);
bool matches = true;
std::string result;
if (EndsWith(opt_name, struct_name)) {
// This option represents the entire struct
for (const auto& iter : *struct_map) {
const auto& opt_info = iter.second;
matches = opt_info.AreEqual(config_options, iter.first, this_addr,
that_addr, &result);
if (!matches) {
*mismatch = struct_name + "." + result;
return false;
}
}
} else if (StartsWith(opt_name, struct_name + ".")) {
// This option represents a nested field in the struct (e.g, struct.field)
std::string elem_name;
const auto opt_info =
Find(opt_name.substr(struct_name.size() + 1), *struct_map, &elem_name);
assert(opt_info);
if (opt_info == nullptr) {
*mismatch = opt_name;
matches = false;
} else if (!opt_info->AreEqual(config_options, elem_name, this_addr,
that_addr, &result)) {
matches = false;
*mismatch = struct_name + "." + result;
}
} else {
// This option represents a field in the struct (e.g. field)
std::string elem_name;
const auto opt_info = Find(opt_name, *struct_map, &elem_name);
assert(opt_info);
if (opt_info == nullptr) {
*mismatch = struct_name + "." + opt_name;
matches = false;
} else if (!opt_info->AreEqual(config_options, elem_name, this_addr,
that_addr, &result)) {
matches = false;
*mismatch = struct_name + "." + result;
}
}
return matches;
}
bool MatchesOptionsTypeFromMap(
const ConfigOptions& config_options,
const std::unordered_map<std::string, OptionTypeInfo>& type_map,
const void* const this_ptr, const void* const that_ptr,
std::string* mismatch) {
for (auto& pair : type_map) {
// We skip checking deprecated variables as they might
// contain random values since they might not be initialized
if (config_options.IsCheckEnabled(pair.second.GetSanityLevel())) {
if (!pair.second.AreEqual(config_options, pair.first, this_ptr, that_ptr,
mismatch) &&
!pair.second.AreEqualByName(config_options, pair.first, this_ptr,
that_ptr)) {
return false;
}
}
}
return true;
}
bool OptionTypeInfo::AreEqualByName(const ConfigOptions& config_options,
const std::string& opt_name,
const void* const this_ptr,
const void* const that_ptr) const {
if (IsByName()) {
std::string that_value;
if (Serialize(config_options, opt_name, that_ptr, &that_value).ok()) {
return AreEqualByName(config_options, opt_name, this_ptr, that_value);
}
}
return false;
}
bool OptionTypeInfo::AreEqualByName(const ConfigOptions& config_options,
const std::string& opt_name,
const void* const opt_ptr,
const std::string& that_value) const {
std::string this_value;
if (!IsByName()) {
return false;
} else if (!Serialize(config_options, opt_name, opt_ptr, &this_value).ok()) {
return false;
} else if (IsEnabled(OptionVerificationType::kByNameAllowFromNull)) {
if (that_value == kNullptrString) {
return true;
}
} else if (IsEnabled(OptionVerificationType::kByNameAllowNull)) {
if (that_value == kNullptrString) {
return true;
}
}
return (this_value == that_value);
}
const OptionTypeInfo* OptionTypeInfo::Find(
const std::string& opt_name,
const std::unordered_map<std::string, OptionTypeInfo>& opt_map,
std::string* elem_name) {
const auto iter = opt_map.find(opt_name); // Look up the value in the map
if (iter != opt_map.end()) { // Found the option in the map
*elem_name = opt_name; // Return the name
return &(iter->second); // Return the contents of the iterator
} else {
auto idx = opt_name.find("."); // Look for a separator
if (idx > 0 && idx != std::string::npos) { // We found a separator
auto siter =
opt_map.find(opt_name.substr(0, idx)); // Look for the short name
if (siter != opt_map.end()) { // We found the short name
if (siter->second.IsStruct() || // If the object is a struct
siter->second.IsConfigurable()) { // or a Configurable
*elem_name = opt_name.substr(idx + 1); // Return the rest
return &(siter->second); // Return the contents of the iterator
}
}
}
}
return nullptr;
}
#endif // !ROCKSDB_LITE
} // namespace ROCKSDB_NAMESPACE
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