| /* |
| * Copyright (C) 2016 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 |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef _RESOLVER_STATS_H_ |
| #define _RESOLVER_STATS_H_ |
| |
| #include <time.h> |
| |
| namespace android { |
| namespace net { |
| |
| struct ResolverStats { |
| // Offsets into the per-server resolver stats as encoded in vector<int32_t> stats of |
| // getResolverInfo() of Netd's binder interface. The stats are based on data reported by |
| // android_net_res_stats_get_info_for_net(), the usability is calculated by applying |
| // android_net_res_stats_get_usable_servers() to this data. |
| enum ResolverStatsOffsets { |
| STATS_SUCCESSES = 0, // # successes counted for this server |
| STATS_ERRORS, // # errors |
| STATS_TIMEOUTS, // # timeouts |
| STATS_INTERNAL_ERRORS, // # internal errors |
| STATS_RTT_AVG, // average round-trip-time |
| STATS_LAST_SAMPLE_TIME, // time in s when the last sample was recorded |
| STATS_USABLE, // whether the server is considered usable |
| STATS_COUNT // total count of integers in the per-server data |
| }; |
| |
| int successes{-1}; |
| int errors{-1}; |
| int timeouts{-1}; |
| int internal_errors{-1}; |
| int rtt_avg{-1}; |
| time_t last_sample_time{0}; |
| bool usable{false}; |
| |
| // Serialize the resolver stats to the end of |out|. |
| void encode(std::vector<int32_t>* out) const; |
| |
| // Read the serialized resolverstats starting at |in[ofs]|. |
| ssize_t decode(const std::vector<int32_t>& in, ssize_t ofs); |
| |
| // Serialize the contents of |stats| and append them to the end of |out|. Multiple arrays |
| // can be written to the same output vector in sequence, however, the corresponding call |
| // to decodeAll() will return the combined contents in one vector. |
| static void encodeAll(const std::vector<ResolverStats>& stats, std::vector<int32_t>* out); |
| |
| // Decodes the serialized ResolverStats from |in| and appends them to stats. |
| static bool decodeAll(const std::vector<int32_t>& in, std::vector<ResolverStats>* stats); |
| }; |
| |
| inline void ResolverStats::encode(std::vector<int32_t>* out) const { |
| size_t ofs = out->size(); |
| out->resize(ofs + STATS_COUNT); |
| int32_t* cur = &(*out)[ofs]; |
| cur[STATS_SUCCESSES] = successes; |
| cur[STATS_ERRORS] = errors; |
| cur[STATS_TIMEOUTS] = timeouts; |
| cur[STATS_INTERNAL_ERRORS] = internal_errors; |
| cur[STATS_RTT_AVG] = rtt_avg; |
| cur[STATS_LAST_SAMPLE_TIME] = last_sample_time; |
| cur[STATS_USABLE] = usable; |
| } |
| |
| // Read the serialized resolverstats starting at |in[ofs]|. |
| inline ssize_t ResolverStats::decode(const std::vector<int32_t>& in, ssize_t ofs) { |
| if (ofs < 0 || static_cast<size_t>(ofs) + STATS_COUNT > in.size()) { |
| return -1; |
| } |
| const int32_t* cur = &in[ofs]; |
| successes = cur[STATS_SUCCESSES]; |
| errors = cur[STATS_ERRORS]; |
| timeouts = cur[STATS_TIMEOUTS]; |
| internal_errors = cur[STATS_INTERNAL_ERRORS]; |
| rtt_avg = cur[STATS_RTT_AVG]; |
| last_sample_time = cur[STATS_LAST_SAMPLE_TIME]; |
| usable = cur[STATS_USABLE]; |
| return ofs + STATS_COUNT; |
| } |
| |
| inline void ResolverStats::encodeAll(const std::vector<ResolverStats>& stats, |
| std::vector<int32_t>* out) { |
| for (const auto& s : stats) { |
| s.encode(out); |
| } |
| } |
| |
| // TODO: Replace with a better representation, e.g. a Parcelable. |
| inline bool ResolverStats::decodeAll(const std::vector<int32_t>& in, |
| std::vector<ResolverStats>* stats) { |
| ssize_t size = in.size(); |
| if (size % STATS_COUNT) { |
| return false; |
| } |
| stats->resize(size / STATS_COUNT); |
| ssize_t ofs = 0; |
| for (auto& s : *stats) { |
| ofs = s.decode(in, ofs); |
| if (ofs < 0) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| } // namespace net |
| } // namespace android |
| |
| #endif /* _RESOLVER_STATS_H_ */ |