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117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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*/
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#pragma once
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#include "td/utils/Status.h"
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#include "td/utils/logging.h"
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namespace td {
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class KeyValueReader {
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public:
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virtual ~KeyValueReader() = default;
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enum class GetStatus : int32 { Ok, NotFound };
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virtual Result<GetStatus> get(Slice key, std::string &value) = 0;
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virtual Result<size_t> count(Slice prefix) = 0;
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};
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class PrefixedKeyValueReader : public KeyValueReader {
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public:
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PrefixedKeyValueReader(std::shared_ptr<KeyValueReader> reader, Slice prefix)
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: reader_(std::move(reader)), prefix_(prefix.str()) {
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}
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Result<GetStatus> get(Slice key, std::string &value) override {
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return reader_->get(PSLICE() << prefix_ << key, value);
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}
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Result<size_t> count(Slice prefix) override {
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return reader_->count(PSLICE() << prefix_ << prefix);
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}
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private:
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std::shared_ptr<KeyValueReader> reader_;
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std::string prefix_;
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};
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class KeyValueUtils {
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public:
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};
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class KeyValue : public KeyValueReader {
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public:
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virtual Status set(Slice key, Slice value) = 0;
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virtual Status erase(Slice key) = 0;
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virtual Status begin_transaction() = 0;
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virtual Status commit_transaction() = 0;
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virtual Status abort_transaction() = 0;
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// Desctructor will abort transaction
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virtual std::unique_ptr<KeyValueReader> snapshot() = 0;
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virtual std::string stats() const {
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return "";
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}
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virtual Status flush() {
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return Status::OK();
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}
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};
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class PrefixedKeyValue : public KeyValue {
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public:
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PrefixedKeyValue(std::shared_ptr<KeyValue> kv, Slice prefix) : kv_(std::move(kv)), prefix_(prefix.str()) {
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}
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Result<GetStatus> get(Slice key, std::string &value) override {
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return kv_->get(PSLICE() << prefix_ << key, value);
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}
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Result<size_t> count(Slice prefix) override {
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return kv_->count(PSLICE() << prefix_ << prefix);
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}
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Status set(Slice key, Slice value) override {
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return kv_->set(PSLICE() << prefix_ << key, value);
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}
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Status erase(Slice key) override {
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return kv_->erase(PSLICE() << prefix_ << key);
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}
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Status begin_transaction() override {
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return kv_->begin_transaction();
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}
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Status commit_transaction() override {
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return kv_->commit_transaction();
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}
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Status abort_transaction() override {
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return kv_->abort_transaction();
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}
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// Desctructor will abort transaction
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std::unique_ptr<KeyValueReader> snapshot() override {
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return kv_->snapshot();
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}
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std::string stats() const override {
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return kv_->stats();
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}
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Status flush() override {
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return kv_->flush();
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}
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private:
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std::shared_ptr<KeyValue> kv_;
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std::string prefix_;
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};
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} // namespace td
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