blob: 40dad94e66b335c6f9f6e4bd51faac90b54cc429 [file] [log] [blame]
* Copyright (C) 2019 The Android Open Source Project
* Licensed 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#pragma once
#include <chrono>
#include <deque>
#include <map>
#include <vector>
#include <android-base/thread_annotations.h>
#include <netdutils/DumpWriter.h>
#include <netdutils/InternetAddresses.h>
#include "ResolverStats.h"
#include "stats.pb.h"
namespace android::net {
// The overall information of a StatsRecords.
struct StatsData {
StatsData(const netdutils::IPSockAddr& ipSockAddr) : serverSockAddr(ipSockAddr) {
lastUpdate = std::chrono::steady_clock::now();
// Server socket address.
netdutils::IPSockAddr serverSockAddr;
// The most recent number of records being accumulated.
int total = 0;
// The map used to store the number of each rcode.
std::map<int, int> rcodeCounts;
// The aggregated RTT in microseconds.
// For DNS-over-TCP, it includes TCP handshake.
// For DNS-over-TLS, it might include TCP handshake plus SSL handshake.
std::chrono::microseconds latencyUs = {};
// The last update timestamp.
std::chrono::time_point<std::chrono::steady_clock> lastUpdate;
std::string toString() const;
// For testing.
bool operator==(const StatsData& o) const;
friend std::ostream& operator<<(std::ostream& os, const StatsData& data) {
return os << data.toString();
// A circular buffer based class used to store the statistics for a server with a protocol.
class StatsRecords {
struct Record {
int rcode;
std::chrono::microseconds latencyUs;
StatsRecords(const netdutils::IPSockAddr& ipSockAddr, size_t size);
void push(const Record& record);
const StatsData& getStatsData() const { return mStatsData; }
void updateStatsData(const Record& record, const bool add);
std::deque<Record> mRecords;
size_t mCapacity;
StatsData mStatsData;
// DnsStats class manages the statistics of DNS servers per netId.
// The class itself is not thread-safe.
class DnsStats {
using ServerStatsMap = std::map<netdutils::IPSockAddr, StatsRecords>;
// Add |servers| to the map, and remove no-longer-used servers.
// Return true if they are successfully added; otherwise, return false.
bool setServers(const std::vector<netdutils::IPSockAddr>& servers, Protocol protocol);
// Return true if |record| is successfully added into |server|'s stats; otherwise, return false.
bool addStats(const netdutils::IPSockAddr& server, const DnsQueryEvent& record);
void dump(netdutils::DumpWriter& dw);
// For testing.
std::vector<StatsData> getStats(Protocol protocol) const;
// TODO: Compatible support for getResolverInfo().
// TODO: Support getSortedServers().
static constexpr size_t kLogSize = 128;
std::map<Protocol, ServerStatsMap> mStats;
} // namespace android::net