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TopK.h
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TopK.h
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/**
* Copyright 2021 Pieter du Preez <pdupreez@gmail.com>
*
* Licensed 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.
**/
#ifndef REDIS_PLUS_PLUS_TOP_K_H
#define REDIS_PLUS_PLUS_TOP_K_H
#include "RedisBloom.h"
namespace redis::module {
template <typename RedisInstance>
class TopK : public RedisBloom<RedisInstance>
{
public:
explicit TopK(RedisInstance& redis) : RedisBloom<RedisInstance>(redis, "TOPK") {}
// The following is an implementation of:
// https://oss.redislabs.com/redisbloom/TopK_Commands/
bool reserve(const sw::redis::StringView &key,
long long topk,
long long width = default_width,
long long depth = default_depth,
double decay = default_decay) {
auto result = RedisBloom<RedisInstance>::_redis.template
command<std::string>("TOPK.RESERVE", key, topk, width, depth, decay);
return result == "OK";
}
template <typename Input, typename Output>
void add(const sw::redis::StringView &key, Input first, Input last, Output output) {
static const std::string cmd = "TOPK.ADD";
sw::redis::range_check(cmd.c_str(), first, last);
std::vector<sw::redis::StringView> args = { cmd, key };
std::for_each(first, last, [&args](auto &s){ args.push_back(s); });
RedisBloom<RedisInstance>::_redis.command(args.begin(), args.end(), output);
}
template <typename Input>
void incrby(const sw::redis::StringView &key,
Input first,
Input last) {
static const std::string cmd = "TOPK.INCRBY";
sw::redis::range_check(cmd.c_str(), first, last);
std::vector<std::string> args = { cmd.data(), key.data() };
std::for_each(first, last, [&args](auto &p){
args.push_back(p.first);
args.push_back(std::to_string(p.second));
});
RedisBloom<RedisInstance>::_redis.command(args.begin(), args.end());
}
template <typename Input, typename Output>
void incrby(const sw::redis::StringView &key,
Input first,
Input last,
Output output) {
static const std::string cmd = "TOPK.INCRBY";
sw::redis::range_check(cmd.c_str(), first, last);
std::vector<std::string> args = { cmd.data(), key.data() };
std::for_each(first, last, [&args](auto &p){
args.push_back(p.first);
args.push_back(std::to_string(p.second));
});
RedisBloom<RedisInstance>::_redis.command(args.begin(), args.end(), output);
}
template <typename Input, typename Output>
void query(const sw::redis::StringView &key, Input first, Input last, Output output) {
static const std::string cmd = "TOPK.QUERY";
sw::redis::range_check(cmd.c_str(), first, last);
std::vector<sw::redis::StringView> args = { cmd, key };
std::for_each(first, last, [&args](auto &s){ args.push_back(s); });
RedisBloom<RedisInstance>::_redis.command(args.begin(), args.end(), output);
}
template <typename Input, typename Output>
void count(const sw::redis::StringView &key, Input first, Input last, Output output) {
static const std::string cmd = "TOPK.COUNT";
sw::redis::range_check(cmd.c_str(), first, last);
std::vector<sw::redis::StringView> args = { cmd, key };
std::for_each(first, last, [&args](auto &s){ args.push_back(s); });
RedisBloom<RedisInstance>::_redis.command(args.begin(), args.end(), output);
}
template <typename Output>
void list(const sw::redis::StringView &key, Output output) {
static const std::string cmd = "TOPK.LIST";
std::vector<sw::redis::StringView> args = { cmd, key };
RedisBloom<RedisInstance>::_redis.command(args.begin(), args.end(), output);
}
// The decay needs to be converted,
template <typename Output>
void info(const sw::redis::StringView &key, Output &output) {
auto reply = RedisBloom<RedisInstance>::_redis.command("TOPK.INFO", key);
if (reply == nullptr) {
throw sw::redis::ProtoError("Null reply");
}
for (std::size_t idx = 0; idx<reply->elements;) {
auto *sub_reply_key = reply->element[idx++];
if (sub_reply_key == nullptr || !sw::redis::reply::is_status(*sub_reply_key)) {
throw sw::redis::ProtoError("Null array element.key reply");
}
auto *sub_reply = reply->element[idx++];
if (sub_reply == nullptr) {
throw sw::redis::ProtoError("Null array element.val reply");
}
else if (sw::redis::reply::is_integer(*sub_reply)) {
output.insert(std::pair<std::string, double>
(std::string(sub_reply_key->str),
double(sub_reply->integer)));
}
else if (sw::redis::reply::is_string(*sub_reply)) {
output.insert(std::pair<std::string, double>
(std::string(sub_reply_key->str),
std::stod(sub_reply->str)));
}
else {
throw sw::redis::ProtoError("Wrong array element reply type " + std::to_string(sub_reply->type));
}
}
}
private:
constexpr static const long long default_width = 8;
constexpr static const long long default_depth = 7;
constexpr static const double default_decay = 0.9;
};
} // namespace
#endif