| /** @file |
| |
| Implementation of nexthop consistent hash selections strategies. |
| |
| @section license License |
| |
| 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. |
| */ |
| |
| #pragma once |
| |
| #include <map> |
| #include <vector> |
| #include "NextHopSelectionStrategy.h" |
| |
| enum NHHashKeyType { |
| NH_URL_HASH_KEY = 0, |
| NH_HOSTNAME_HASH_KEY, |
| NH_PATH_HASH_KEY, // default, consistent hash uses the request url path |
| NH_PATH_QUERY_HASH_KEY, |
| NH_PATH_FRAGMENT_HASH_KEY, |
| NH_CACHE_HASH_KEY |
| }; |
| |
| class NextHopConsistentHash : public NextHopSelectionStrategy |
| { |
| std::vector<std::shared_ptr<ATSConsistentHash>> rings; |
| |
| uint64_t getHashKey(uint64_t sm_id, HttpRequestData *hrdata, ATSHash64 *h); |
| |
| public: |
| NHHashKeyType hash_key = NH_PATH_HASH_KEY; |
| |
| NextHopConsistentHash() = delete; |
| NextHopConsistentHash(const std::string_view name, const NHPolicyType &policy) : NextHopSelectionStrategy(name, policy) {} |
| ~NextHopConsistentHash(); |
| bool Init(const YAML::Node &n); |
| void findNextHop(TSHttpTxn txnp, void *ih = nullptr, time_t now = 0) override; |
| }; |