1 // Copyright 2024 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #include "pw_log/rate_limited.h" 16 17 namespace pw::log::internal { 18 Poll(chrono::SystemClock::duration min_interval_between_logs)19RateLimiter::PollResult RateLimiter::Poll( 20 chrono::SystemClock::duration min_interval_between_logs) { 21 PollResult result({ 22 .count = 0, 23 .logs_per_s = 0, 24 }); 25 const chrono::SystemClock::time_point now = chrono::SystemClock::now(); 26 const chrono::SystemClock::duration elapsed = now - last_timestamp_; 27 28 if (count_ < std::numeric_limits<uint16_t>::max()) { 29 count_++; 30 } 31 32 if (last_timestamp_.time_since_epoch().count() != 0 && 33 elapsed < min_interval_between_logs) { 34 return result; 35 } 36 37 // Add half to round not floor. 38 uint16_t elapsed_ms = 39 std::chrono::duration_cast<std::chrono::milliseconds>(elapsed).count(); 40 if (elapsed_ms != 0) { 41 result.logs_per_s = (count_ * 1000 + 500) / elapsed_ms; 42 } 43 result.count = count_; 44 45 last_timestamp_ = now; 46 count_ = 0; 47 48 return result; 49 } 50 51 } // namespace pw::log::internal