mirror of
https://github.com/zerotier/ZeroTierOne.git
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138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
/**************************************************************************
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Copyright (c) 2017 sewenew
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*************************************************************************/
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#ifndef SEWENEW_REDISPLUSPLUS_SHARDS_POOL_H
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#define SEWENEW_REDISPLUSPLUS_SHARDS_POOL_H
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#include <cassert>
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#include <unordered_map>
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#include <string>
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#include <random>
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#include <memory>
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#include "reply.h"
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#include "connection_pool.h"
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#include "shards.h"
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namespace sw {
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namespace redis {
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using ConnectionPoolSPtr = std::shared_ptr<ConnectionPool>;
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class GuardedConnection {
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public:
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GuardedConnection(const ConnectionPoolSPtr &pool) : _pool(pool),
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_connection(_pool->fetch()) {
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assert(!_connection.broken());
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}
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GuardedConnection(const GuardedConnection &) = delete;
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GuardedConnection& operator=(const GuardedConnection &) = delete;
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GuardedConnection(GuardedConnection &&) = default;
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GuardedConnection& operator=(GuardedConnection &&) = default;
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~GuardedConnection() {
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_pool->release(std::move(_connection));
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}
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Connection& connection() {
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return _connection;
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}
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private:
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ConnectionPoolSPtr _pool;
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Connection _connection;
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};
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class ShardsPool {
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public:
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ShardsPool() = default;
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ShardsPool(const ShardsPool &that) = delete;
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ShardsPool& operator=(const ShardsPool &that) = delete;
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ShardsPool(ShardsPool &&that);
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ShardsPool& operator=(ShardsPool &&that);
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~ShardsPool() = default;
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ShardsPool(const ConnectionPoolOptions &pool_opts,
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const ConnectionOptions &connection_opts);
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// Fetch a connection by key.
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GuardedConnection fetch(const StringView &key);
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// Randomly pick a connection.
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GuardedConnection fetch();
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// Fetch a connection by node.
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GuardedConnection fetch(const Node &node);
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void update();
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ConnectionOptions connection_options(const StringView &key);
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ConnectionOptions connection_options();
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private:
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void _move(ShardsPool &&that);
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void _init_pool(const Shards &shards);
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Shards _cluster_slots(Connection &connection) const;
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ReplyUPtr _cluster_slots_command(Connection &connection) const;
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Shards _parse_reply(redisReply &reply) const;
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std::pair<SlotRange, Node> _parse_slot_info(redisReply &reply) const;
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// Get slot by key.
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std::size_t _slot(const StringView &key) const;
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// Randomly pick a slot.
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std::size_t _slot() const;
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ConnectionPoolSPtr& _get_pool(Slot slot);
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GuardedConnection _fetch(Slot slot);
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ConnectionOptions _connection_options(Slot slot);
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using NodeMap = std::unordered_map<Node, ConnectionPoolSPtr, NodeHash>;
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NodeMap::iterator _add_node(const Node &node);
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ConnectionPoolOptions _pool_opts;
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ConnectionOptions _connection_opts;
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Shards _shards;
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NodeMap _pools;
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std::mutex _mutex;
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static const std::size_t SHARDS = 16383;
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};
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}
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}
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#endif // end SEWENEW_REDISPLUSPLUS_SHARDS_POOL_H
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