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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| * | ||
| */ | ||
|
|
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| #include <types/redis_hyperloglog.h> | ||
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| #include <algorithm> | ||
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| #include "commander.h" | ||
| #include "commands/command_parser.h" | ||
| #include "server/redis_reply.h" | ||
| #include "server/server.h" | ||
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| namespace redis { | ||
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| /// PFADD key [element [element ...]] | ||
| /// Complexity: O(1) for each element added. | ||
| class CommandPfAdd final : public Commander { | ||
| public: | ||
| Status Execute(Server *srv, Connection *conn, std::string *output) override { | ||
| redis::HyperLogLog hll(srv->storage, conn->GetNamespace()); | ||
| std::vector<uint64_t> hashes(args_.size() - 1); | ||
| for (size_t i = 1; i < args_.size(); i++) { | ||
| hashes[i - 1] = redis::HyperLogLog::HllHash(args_[i]); | ||
| } | ||
| uint64_t ret{}; | ||
| auto s = hll.Add(args_[0], hashes, &ret); | ||
| if (!s.ok() && !s.IsNotFound()) { | ||
| return {Status::RedisExecErr, s.ToString()}; | ||
| } | ||
| *output = redis::Integer(ret); | ||
| return Status::OK(); | ||
| } | ||
| }; | ||
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| /// PFCOUNT key [key ...] | ||
| /// Complexity: O(1) with a very small average constant time when called with a single key. | ||
| /// O(N) with N being the number of keys, and much bigger constant times, | ||
| /// when called with multiple keys. | ||
| class CommandPfCount final : public Commander { | ||
| Status Execute(Server *srv, Connection *conn, std::string *output) override { | ||
| redis::HyperLogLog hll(srv->storage, conn->GetNamespace()); | ||
| uint64_t ret{}; | ||
| rocksdb::Status s; | ||
| if (args_.size() > 1) { | ||
| std::vector<Slice> keys(args_.begin(), args_.end()); | ||
| s = hll.CountMultiple(keys, &ret); | ||
| } else { | ||
| s = hll.Count(args_[0], &ret); | ||
| } | ||
| if (!s.ok() && !s.IsNotFound()) { | ||
| return {Status::RedisExecErr, s.ToString()}; | ||
| } | ||
| if (s.IsNotFound()) { | ||
| ret = 0; | ||
| } | ||
| *output = redis::Integer(ret); | ||
| return Status::OK(); | ||
| } | ||
| }; | ||
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| /// PFMERGE destkey [sourcekey [sourcekey ...]] | ||
| /// | ||
| /// complexity: O(N) to merge N HyperLogLogs, but with high constant times. | ||
| class CommandPfMerge final : public Commander { | ||
| Status Execute(Server *srv, Connection *conn, std::string *output) override { | ||
| redis::HyperLogLog hll(srv->storage, conn->GetNamespace()); | ||
| std::vector<std::string> keys(args_.begin() + 1, args_.end()); | ||
| std::vector<Slice> src_user_keys; | ||
| src_user_keys.reserve(args_.size() - 1); | ||
| for (size_t i = 1; i < args_.size(); i++) { | ||
| src_user_keys.emplace_back(args_[i]); | ||
| } | ||
| auto s = hll.Merge(/*dest_user_key=*/args_[0], src_user_keys); | ||
| if (!s.ok() && !s.IsNotFound()) { | ||
| return {Status::RedisExecErr, s.ToString()}; | ||
| } | ||
| *output = redis::SimpleString("OK"); | ||
| return Status::OK(); | ||
| } | ||
| }; | ||
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| REDIS_REGISTER_COMMANDS(MakeCmdAttr<CommandPfAdd>("pfadd", -2, "write", 1, 1, 1), | ||
| MakeCmdAttr<CommandPfCount>("pfcount", -2, "read-only", 1, -1, 1), | ||
| MakeCmdAttr<CommandPfMerge>("pfmerge", -2, "write", 1, -1, 1), ); | ||
|
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| } // namespace redis |
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