| 1 | /* |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This source code is licensed under both the BSD-style license (found in the |
| 6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
| 7 | * in the COPYING file in the root directory of this source tree). |
| 8 | */ |
| 9 | #pragma once |
| 10 | |
| 11 | #include <cstdio> |
| 12 | #include <mutex> |
| 13 | |
| 14 | namespace pzstd { |
| 15 | |
| 16 | constexpr int kLogError = 1; |
| 17 | constexpr int kLogInfo = 2; |
| 18 | constexpr int kLogDebug = 3; |
| 19 | constexpr int kLogVerbose = 4; |
| 20 | |
| 21 | class Logger { |
| 22 | std::mutex mutex_; |
| 23 | FILE* out_; |
| 24 | const int level_; |
| 25 | |
| 26 | using Clock = std::chrono::system_clock; |
| 27 | Clock::time_point lastUpdate_; |
| 28 | std::chrono::milliseconds refreshRate_; |
| 29 | |
| 30 | public: |
| 31 | explicit Logger(int level, FILE* out = stderr) |
| 32 | : out_(out), level_(level), lastUpdate_(Clock::now()), |
| 33 | refreshRate_(150) {} |
| 34 | |
| 35 | |
| 36 | bool logsAt(int level) { |
| 37 | return level <= level_; |
| 38 | } |
| 39 | |
| 40 | template <typename... Args> |
| 41 | void operator()(int level, const char *fmt, Args... args) { |
| 42 | if (level > level_) { |
| 43 | return; |
| 44 | } |
| 45 | std::lock_guard<std::mutex> lock(mutex_); |
| 46 | std::fprintf(out_, fmt, args...); |
| 47 | } |
| 48 | |
| 49 | template <typename... Args> |
| 50 | void update(int level, const char *fmt, Args... args) { |
| 51 | if (level > level_) { |
| 52 | return; |
| 53 | } |
| 54 | std::lock_guard<std::mutex> lock(mutex_); |
| 55 | auto now = Clock::now(); |
| 56 | if (now - lastUpdate_ > refreshRate_) { |
| 57 | lastUpdate_ = now; |
| 58 | std::fprintf(out_, "\r"); |
| 59 | std::fprintf(out_, fmt, args...); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | void clear(int level) { |
| 64 | if (level > level_) { |
| 65 | return; |
| 66 | } |
| 67 | std::lock_guard<std::mutex> lock(mutex_); |
| 68 | std::fprintf(out_, "\r%79s\r", ""); |
| 69 | } |
| 70 | }; |
| 71 | |
| 72 | } |