Mike Yu | e655b1d | 2019-08-28 17:49:59 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #pragma once |
| 19 | |
| 20 | #include <chrono> |
| 21 | #include <deque> |
| 22 | #include <map> |
| 23 | #include <vector> |
| 24 | |
| 25 | #include <android-base/thread_annotations.h> |
| 26 | #include <netdutils/DumpWriter.h> |
| 27 | #include <netdutils/InternetAddresses.h> |
| 28 | |
| 29 | #include "ResolverStats.h" |
| 30 | #include "stats.pb.h" |
| 31 | |
| 32 | namespace android::net { |
| 33 | |
| 34 | // The overall information of a StatsRecords. |
| 35 | struct StatsData { |
| 36 | StatsData(const netdutils::IPSockAddr& ipSockAddr) : serverSockAddr(ipSockAddr) { |
| 37 | lastUpdate = std::chrono::steady_clock::now(); |
| 38 | }; |
| 39 | |
| 40 | // Server socket address. |
| 41 | netdutils::IPSockAddr serverSockAddr; |
| 42 | |
| 43 | // The most recent number of records being accumulated. |
| 44 | int total = 0; |
| 45 | |
| 46 | // The map used to store the number of each rcode. |
| 47 | std::map<int, int> rcodeCounts; |
| 48 | |
| 49 | // The aggregated RTT in microseconds. |
| 50 | // For DNS-over-TCP, it includes TCP handshake. |
| 51 | // For DNS-over-TLS, it might include TCP handshake plus SSL handshake. |
| 52 | std::chrono::microseconds latencyUs = {}; |
| 53 | |
| 54 | // The last update timestamp. |
| 55 | std::chrono::time_point<std::chrono::steady_clock> lastUpdate; |
| 56 | |
| 57 | std::string toString() const; |
| 58 | |
| 59 | // For testing. |
| 60 | bool operator==(const StatsData& o) const; |
| 61 | friend std::ostream& operator<<(std::ostream& os, const StatsData& data) { |
| 62 | return os << data.toString(); |
| 63 | } |
| 64 | }; |
| 65 | |
| 66 | // A circular buffer based class used to store the statistics for a server with a protocol. |
| 67 | class StatsRecords { |
| 68 | public: |
| 69 | struct Record { |
| 70 | int rcode; |
| 71 | std::chrono::microseconds latencyUs; |
| 72 | }; |
| 73 | |
| 74 | StatsRecords(const netdutils::IPSockAddr& ipSockAddr, size_t size); |
| 75 | |
| 76 | void push(const Record& record); |
| 77 | |
| 78 | const StatsData& getStatsData() const { return mStatsData; } |
| 79 | |
| 80 | private: |
| 81 | void updateStatsData(const Record& record, const bool add); |
| 82 | |
| 83 | std::deque<Record> mRecords; |
| 84 | size_t mCapacity; |
| 85 | StatsData mStatsData; |
| 86 | }; |
| 87 | |
| 88 | // DnsStats class manages the statistics of DNS servers per netId. |
| 89 | // The class itself is not thread-safe. |
| 90 | class DnsStats { |
| 91 | public: |
| 92 | using ServerStatsMap = std::map<netdutils::IPSockAddr, StatsRecords>; |
| 93 | |
| 94 | // Add |servers| to the map, and remove no-longer-used servers. |
| 95 | // Return true if they are successfully added; otherwise, return false. |
| 96 | bool setServers(const std::vector<netdutils::IPSockAddr>& servers, Protocol protocol); |
| 97 | |
| 98 | // Return true if |record| is successfully added into |server|'s stats; otherwise, return false. |
| 99 | bool addStats(const netdutils::IPSockAddr& server, const DnsQueryEvent& record); |
| 100 | |
| 101 | void dump(netdutils::DumpWriter& dw); |
| 102 | |
| 103 | // For testing. |
| 104 | std::vector<StatsData> getStats(Protocol protocol) const; |
| 105 | |
| 106 | // TODO: Compatible support for getResolverInfo(). |
| 107 | // TODO: Support getSortedServers(). |
| 108 | |
Mike Yu | 61d118e | 2019-12-23 21:08:19 +0800 | [diff] [blame] | 109 | static constexpr size_t kLogSize = 128; |
| 110 | |
Mike Yu | e655b1d | 2019-08-28 17:49:59 +0800 | [diff] [blame] | 111 | private: |
| 112 | std::map<Protocol, ServerStatsMap> mStats; |
Mike Yu | e655b1d | 2019-08-28 17:49:59 +0800 | [diff] [blame] | 113 | }; |
| 114 | |
| 115 | } // namespace android::net |