84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "util/dns_cache.h"
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#include "service/backend_options.h"
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#include "util/network_util.h"
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namespace doris {
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DNSCache::DNSCache() {
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refresh_thread = std::thread(&DNSCache::_refresh_cache, this);
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}
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DNSCache::~DNSCache() {
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stop_refresh = true;
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if (refresh_thread.joinable()) {
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refresh_thread.join();
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}
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}
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Status DNSCache::get(const std::string& hostname, std::string* ip) {
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{
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std::shared_lock<std::shared_mutex> lock(mutex);
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auto it = cache.find(hostname);
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if (it != cache.end()) {
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*ip = it->second;
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return Status::OK();
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}
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}
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// Update if not found
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RETURN_IF_ERROR(_update(hostname));
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{
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std::shared_lock<std::shared_mutex> lock(mutex);
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*ip = cache[hostname];
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return Status::OK();
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}
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}
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Status DNSCache::_update(const std::string& hostname) {
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std::string real_ip = "";
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RETURN_IF_ERROR(hostname_to_ip(hostname, real_ip, BackendOptions::is_bind_ipv6()));
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std::unique_lock<std::shared_mutex> lock(mutex);
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auto it = cache.find(hostname);
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if (it == cache.end() || it->second != real_ip) {
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cache[hostname] = real_ip;
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LOG(INFO) << "update hostname " << hostname << "'s ip to " << real_ip;
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}
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return Status::OK();
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}
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void DNSCache::_refresh_cache() {
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while (!stop_refresh) {
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// refresh every 1 min
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std::this_thread::sleep_for(std::chrono::minutes(1));
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std::unordered_set<std::string> keys;
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{
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std::shared_lock<std::shared_mutex> lock(mutex);
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std::transform(cache.begin(), cache.end(), std::inserter(keys, keys.end()),
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[](const auto& pair) { return pair.first; });
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}
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Status st;
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for (auto& key : keys) {
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st = _update(key);
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}
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}
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}
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} // end of namespace doris
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