6083bc79f8
Summary: Introducing blob_db::TTLExtractor to replace extract_ttl_fn. The TTL extractor can be use to extract TTL from keys insert with Put or WriteBatch. Change over existing extract_ttl_fn are: * If value is changed, it will be return via std::string* (rather than Slice*). With Slice* the new value has to be part of the existing value. With std::string* the limitation is removed. * It can optionally return TTL or expiration. Other changes in this PR: * replace `std::chrono::system_clock` with `Env::NowMicros` so that I can mock time in tests. * add several TTL tests. * other minor naming change. Closes https://github.com/facebook/rocksdb/pull/2659 Differential Revision: D5512627 Pulled By: yiwu-arbug fbshipit-source-id: 0dfcb00d74d060b8534c6130c808e4d5d0a54440
32 lines
1.0 KiB
C++
32 lines
1.0 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "ttl_extractor.h"
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#include "util/coding.h"
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namespace rocksdb {
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namespace blob_db {
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bool TTLExtractor::ExtractTTL(const Slice& /*key*/, const Slice& /*value*/,
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uint64_t* /*ttl*/, std::string* /*new_value*/,
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bool* /*value_changed*/) {
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return false;
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}
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bool TTLExtractor::ExtractExpiration(const Slice& key, const Slice& value,
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uint64_t now, uint64_t* expiration,
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std::string* new_value,
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bool* value_changed) {
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uint64_t ttl;
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bool has_ttl = ExtractTTL(key, value, &ttl, new_value, value_changed);
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if (has_ttl) {
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*expiration = now + ttl;
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}
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return has_ttl;
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}
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} // namespace blob_db
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} // namespace rocksdb
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