72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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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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*
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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, 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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*/
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#pragma once
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#include <string>
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#include <vector>
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#include <netdutils/DumpWriter.h>
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#include "LockedQueue.h"
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namespace android::net {
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// This class stores query records in a locked ring buffer. It's thread-safe for concurrent access.
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class DnsQueryLog {
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public:
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static constexpr std::string_view DUMP_KEYWORD = "querylog";
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struct Record {
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Record(uint32_t netId, uid_t uid, pid_t pid, const std::string& hostname,
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const std::vector<std::string>& addrs, int timeTaken)
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: netId(netId),
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uid(uid),
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pid(pid),
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hostname(hostname),
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addrs(addrs),
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timeTaken(timeTaken) {}
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const uint32_t netId;
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const uid_t uid;
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const pid_t pid;
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const std::chrono::system_clock::time_point timestamp = std::chrono::system_clock::now();
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const std::string hostname;
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const std::vector<std::string> addrs;
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const int timeTaken;
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};
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// Allow the tests to set the capacity and the validaty time in milliseconds.
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DnsQueryLog(size_t size = kDefaultLogSize,
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std::chrono::milliseconds time = kDefaultValidityMinutes)
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: mQueue(size), mValidityTimeMs(time) {}
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void push(Record&& record);
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void dump(netdutils::DumpWriter& dw) const;
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private:
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LockedRingBuffer<Record> mQueue;
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const std::chrono::milliseconds mValidityTimeMs;
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// The capacity of the circular buffer.
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static constexpr size_t kDefaultLogSize = 200;
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// Limit to dump the queries within last |kDefaultValidityMinutes| minutes.
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static constexpr std::chrono::minutes kDefaultValidityMinutes{60};
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};
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} // namespace android::net
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