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//
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// Created by Ziyang Hu on 2022/7/3.
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//
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#ifndef COZOROCKS_DB_H
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#define COZOROCKS_DB_H
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#include <utility>
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#include "iostream"
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#include "common.h"
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#include "tx.h"
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#include "slice.h"
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struct SnapshotBridge {
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const Snapshot *snapshot;
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DB *db;
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explicit SnapshotBridge(const Snapshot *snapshot_, DB *db_) : snapshot(snapshot_), db(db_) {}
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~SnapshotBridge() {
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db->ReleaseSnapshot(snapshot);
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// printf("released snapshot\n");
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}
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};
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struct SstFileWriterBridge {
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SstFileWriter inner;
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SstFileWriterBridge(EnvOptions eopts, Options opts) : inner(eopts, opts) {
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}
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inline void finish(RocksDbStatus &status) {
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write_status(inner.Finish(), status);
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}
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inline void put(RustBytes key, RustBytes val, RocksDbStatus &status) {
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write_status(inner.Put(convert_slice(key), convert_slice(val)), status);
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}
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};
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struct RocksDbBridge {
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unique_ptr<Comparator> pri_comparator;
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unique_ptr<Comparator> snd_comparator;
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unique_ptr<TransactionDB> db;
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vector<ColumnFamilyHandle *> cf_handles;
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bool destroy_on_exit;
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string db_path;
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inline unique_ptr<SstFileWriterBridge> get_sst_writer(rust::Str path, size_t idx, RocksDbStatus &status) const {
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DB *db_ = get_base_db();
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auto cf = cf_handles[idx];
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Options options_ = db_->GetOptions(cf);
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auto sst_file_writer = std::make_unique<SstFileWriterBridge>(EnvOptions(), options_);
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string path_(path);
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write_status(sst_file_writer->inner.Open(path_), status);
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return sst_file_writer;
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}
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inline void ingest_sst(rust::Str path, size_t idx, RocksDbStatus &status) const {
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IngestExternalFileOptions ifo;
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DB *db_ = get_base_db();
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string path_(path);
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auto cf = cf_handles[idx];
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write_status(db_->IngestExternalFile(cf, {std::move(path_)}, ifo), status);
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}
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[[nodiscard]] inline const string &get_db_path() const {
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return db_path;
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}
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[[nodiscard]] inline unique_ptr<TxBridge> transact() const {
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auto ret = make_unique<TxBridge>(&*this->db, cf_handles);
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return ret;
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}
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inline void del_range(RustBytes start, RustBytes end, size_t idx, RocksDbStatus &status) const {
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WriteBatch batch;
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auto cf = cf_handles[idx];
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auto s = batch.DeleteRange(cf, convert_slice(start), convert_slice(end));
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if (!s.ok()) {
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write_status(s, status);
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return;
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}
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WriteOptions w_opts;
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TransactionDBWriteOptimizations optimizations;
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optimizations.skip_concurrency_control = true;
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optimizations.skip_duplicate_key_check = true;
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auto s2 = db->Write(w_opts, optimizations, &batch);
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write_status(s2, status);
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}
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void compact_range(RustBytes start, RustBytes end, size_t idx, RocksDbStatus &status) const {
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CompactRangeOptions options;
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auto cf = cf_handles[idx];
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auto start_s = convert_slice(start);
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auto end_s = convert_slice(end);
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auto s = db->CompactRange(options, cf, &start_s, &end_s);
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write_status(s, status);
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}
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DB *get_base_db() const {
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return db->GetBaseDB();
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}
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~RocksDbBridge();
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};
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//typedef int8_t (*CmpFn)(RustBytes a, RustBytes b);
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typedef rust::Fn<std::int8_t(rust::Slice<const std::uint8_t>, rust::Slice<const std::uint8_t>)> RustComparatorFn;
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class RustComparator : public Comparator {
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public:
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inline RustComparator(string name_, bool can_different_bytes_be_equal_, RustComparatorFn f) :
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name(std::move(name_)),
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ext_cmp(f),
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can_different_bytes_be_equal(can_different_bytes_be_equal_) {
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}
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[[nodiscard]] inline int Compare(const Slice &a, const Slice &b) const override {
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return ext_cmp(convert_slice_back(a), convert_slice_back(b));
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}
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[[nodiscard]] inline const char *Name() const override {
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return name.c_str();
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}
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[[nodiscard]] inline bool CanKeysWithDifferentByteContentsBeEqual() const override {
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return can_different_bytes_be_equal;
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}
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inline void FindShortestSeparator(string *, const Slice &) const override {}
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inline void FindShortSuccessor(string *) const override {}
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string name;
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RustComparatorFn ext_cmp;
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bool can_different_bytes_be_equal;
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};
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shared_ptr<RocksDbBridge>
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open_db(const DbOpts &opts, RocksDbStatus &status, bool use_cmp, RustComparatorFn pri_cmp_impl,
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RustComparatorFn snd_cmp_impl);
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#endif //COZOROCKS_DB_H
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