122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
/*
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* Copyright (C) 2016 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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#ifndef _RESOLVER_STATS_H_
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#define _RESOLVER_STATS_H_
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#include <time.h>
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namespace android {
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namespace net {
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struct ResolverStats {
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// Offsets into the per-server resolver stats as encoded in vector<int32_t> stats of
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// getResolverInfo() of Netd's binder interface. The stats are based on data reported by
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// android_net_res_stats_get_info_for_net(), the usability is calculated by applying
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// android_net_res_stats_get_usable_servers() to this data.
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enum ResolverStatsOffsets {
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STATS_SUCCESSES = 0, // # successes counted for this server
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STATS_ERRORS, // # errors
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STATS_TIMEOUTS, // # timeouts
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STATS_INTERNAL_ERRORS, // # internal errors
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STATS_RTT_AVG, // average round-trip-time
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STATS_LAST_SAMPLE_TIME, // time in s when the last sample was recorded
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STATS_USABLE, // whether the server is considered usable
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STATS_COUNT // total count of integers in the per-server data
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};
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int successes{-1};
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int errors{-1};
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int timeouts{-1};
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int internal_errors{-1};
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int rtt_avg{-1};
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time_t last_sample_time{0};
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bool usable{false};
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// Serialize the resolver stats to the end of |out|.
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void encode(std::vector<int32_t>* out) const;
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// Read the serialized resolverstats starting at |in[ofs]|.
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ssize_t decode(const std::vector<int32_t>& in, ssize_t ofs);
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// Serialize the contents of |stats| and append them to the end of |out|. Multiple arrays
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// can be written to the same output vector in sequence, however, the corresponding call
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// to decodeAll() will return the combined contents in one vector.
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static void encodeAll(const std::vector<ResolverStats>& stats, std::vector<int32_t>* out);
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// Decodes the serialized ResolverStats from |in| and appends them to stats.
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static bool decodeAll(const std::vector<int32_t>& in, std::vector<ResolverStats>* stats);
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};
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inline void ResolverStats::encode(std::vector<int32_t>* out) const {
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size_t ofs = out->size();
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out->resize(ofs + STATS_COUNT);
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int32_t* cur = &(*out)[ofs];
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cur[STATS_SUCCESSES] = successes;
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cur[STATS_ERRORS] = errors;
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cur[STATS_TIMEOUTS] = timeouts;
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cur[STATS_INTERNAL_ERRORS] = internal_errors;
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cur[STATS_RTT_AVG] = rtt_avg;
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cur[STATS_LAST_SAMPLE_TIME] = last_sample_time;
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cur[STATS_USABLE] = usable;
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}
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// Read the serialized resolverstats starting at |in[ofs]|.
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inline ssize_t ResolverStats::decode(const std::vector<int32_t>& in, ssize_t ofs) {
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if (ofs < 0 || static_cast<size_t>(ofs) + STATS_COUNT > in.size()) {
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return -1;
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}
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const int32_t* cur = &in[ofs];
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successes = cur[STATS_SUCCESSES];
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errors = cur[STATS_ERRORS];
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timeouts = cur[STATS_TIMEOUTS];
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internal_errors = cur[STATS_INTERNAL_ERRORS];
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rtt_avg = cur[STATS_RTT_AVG];
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last_sample_time = cur[STATS_LAST_SAMPLE_TIME];
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usable = cur[STATS_USABLE];
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return ofs + STATS_COUNT;
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}
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inline void ResolverStats::encodeAll(const std::vector<ResolverStats>& stats,
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std::vector<int32_t>* out) {
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for (const auto& s : stats) {
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s.encode(out);
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}
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}
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// TODO: Replace with a better representation, e.g. a Parcelable.
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inline bool ResolverStats::decodeAll(const std::vector<int32_t>& in,
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std::vector<ResolverStats>* stats) {
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ssize_t size = in.size();
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if (size % STATS_COUNT) {
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return false;
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}
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stats->resize(size / STATS_COUNT);
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ssize_t ofs = 0;
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for (auto& s : *stats) {
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ofs = s.decode(in, ofs);
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if (ofs < 0) {
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return false;
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}
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}
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return true;
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}
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} // namespace net
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} // namespace android
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#endif /* _RESOLVER_STATS_H_ */
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