1 /*
2 * Copyright 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "log.h"
18
19 #include <fmt/color.h>
20 #include <fmt/core.h>
21
22 #include <array>
23 #include <chrono>
24 #include <cstdio>
25 #include <cstdlib>
26 #include <cstring>
27 #include <ctime>
28 #include <optional>
29
30 namespace rootcanal::log {
31
32 // Enable flag for log styling.
33 static bool enable_log_color = true;
34
SetLogColorEnable(bool enable)35 void SetLogColorEnable(bool enable) { enable_log_color = enable; }
36
37 static std::array<char, 5> verbosity_tag = {'D', 'I', 'W', 'E', 'F'};
38
39 static std::array<fmt::text_style, 5> text_style = {
40 fmt::fg(fmt::color::dim_gray),
41 fmt::fg(fmt::color::floral_white),
42 fmt::emphasis::bold | fmt::fg(fmt::color::yellow),
43 fmt::emphasis::bold | fmt::fg(fmt::color::orange_red),
44 fmt::emphasis::bold | fmt::fg(fmt::color::red),
45 };
46
47 static std::array<fmt::color, 16> text_color = {
48 fmt::color::cadet_blue, fmt::color::aquamarine, fmt::color::indian_red,
49 fmt::color::blue_violet, fmt::color::chartreuse, fmt::color::medium_sea_green,
50 fmt::color::deep_pink, fmt::color::medium_orchid, fmt::color::green_yellow,
51 fmt::color::dark_orange, fmt::color::golden_rod, fmt::color::medium_slate_blue,
52 fmt::color::coral, fmt::color::lemon_chiffon, fmt::color::wheat,
53 fmt::color::turquoise,
54 };
55
VLog(Verbosity verb,char const * file,int line,std::optional<int> instance,char const * format,fmt::format_args args)56 void VLog(Verbosity verb, char const* file, int line, std::optional<int> instance,
57 char const* format, fmt::format_args args) {
58 // Generate the time label.
59 auto now = std::chrono::system_clock::now();
60 auto now_ms = std::chrono::time_point_cast<std::chrono::milliseconds>(now);
61 auto now_t = std::chrono::system_clock::to_time_t(now);
62 char time_str[19]; // "mm-dd_HH:MM:SS.mmm\0" is 19 byte long
63 auto n = std::strftime(time_str, sizeof(time_str), "%m-%d %H:%M:%S", std::localtime(&now_t));
64 snprintf(time_str + n, sizeof(time_str) - n, ".%03u",
65 static_cast<unsigned int>(now_ms.time_since_epoch().count() % 1000));
66
67 // Generate the file label.
68 char delimiter = '/';
69 char const* file_name = ::strrchr(file, delimiter);
70 file_name = file_name == nullptr ? file : file_name + 1;
71 char file_str[40]; // file:line limited to 40 characters
72 snprintf(file_str, sizeof(file_str), "%.35s:%d", file_name, line);
73
74 fmt::print("root-canal {} {} {:<35.35} ", verbosity_tag[verb], time_str, file_str);
75
76 if (instance.has_value() && enable_log_color) {
77 fmt::color instance_color = text_color[*instance % text_color.size()];
78 fmt::print(fmt::bg(instance_color) | fmt::fg(fmt::color::black), " {:>2} ", *instance);
79 fmt::print(" ");
80 } else if (instance.has_value()) {
81 fmt::print(" {:>2} ", *instance);
82 } else {
83 fmt::print(" ");
84 }
85
86 if (enable_log_color) {
87 fmt::text_style style = text_style[verb];
88 fmt::vprint(stdout, style, format, args);
89 } else {
90 fmt::vprint(stdout, format, args);
91 }
92
93 fmt::print("\n");
94
95 if (verb == Verbosity::kFatal) {
96 std::abort();
97 }
98 }
99
100 } // namespace rootcanal::log
101