summaryrefslogtreecommitdiffstats
path: root/src/common/logging/backend.cpp
blob: f1c9ed6c4d20afd1e6bb136b7f56e10b83837236 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <atomic>
#include <chrono>
#include <climits>
#include <exception>
#include <stop_token>
#include <thread>
#include <vector>

#include <fmt/format.h>

#ifdef _WIN32
#include <windows.h> // For OutputDebugStringW
#endif

#include "common/fs/file.h"
#include "common/fs/fs.h"
#include "common/fs/fs_paths.h"
#include "common/fs/path_util.h"
#include "common/literals.h"
#include "common/thread.h"

#include "common/logging/backend.h"
#include "common/logging/log.h"
#include "common/logging/log_entry.h"
#include "common/logging/text_formatter.h"
#include "common/settings.h"
#ifdef _WIN32
#include "common/string_util.h"
#endif
#include "common/threadsafe_queue.h"

namespace Common::Log {

namespace {

/**
 * Interface for logging backends.
 */
class Backend {
public:
    virtual ~Backend() = default;

    virtual void Write(const Entry& entry) = 0;

    virtual void EnableForStacktrace() = 0;

    virtual void Flush() = 0;
};

/**
 * Backend that writes to stderr and with color
 */
class ColorConsoleBackend final : public Backend {
public:
    explicit ColorConsoleBackend() = default;

    ~ColorConsoleBackend() override = default;

    void Write(const Entry& entry) override {
        if (enabled.load(std::memory_order_relaxed)) {
            PrintColoredMessage(entry);
        }
    }

    void Flush() override {
        // stderr shouldn't be buffered
    }

    void EnableForStacktrace() override {
        enabled = true;
    }

    void SetEnabled(bool enabled_) {
        enabled = enabled_;
    }

private:
    std::atomic_bool enabled{false};
};

/**
 * Backend that writes to a file passed into the constructor
 */
class FileBackend final : public Backend {
public:
    explicit FileBackend(const std::filesystem::path& filename) {
        auto old_filename = filename;
        old_filename += ".old.txt";

        // Existence checks are done within the functions themselves.
        // We don't particularly care if these succeed or not.
        static_cast<void>(FS::RemoveFile(old_filename));
        static_cast<void>(FS::RenameFile(filename, old_filename));

        file = std::make_unique<FS::IOFile>(filename, FS::FileAccessMode::Write,
                                            FS::FileType::TextFile);
    }

    ~FileBackend() override = default;

    void Write(const Entry& entry) override {
        if (!enabled) {
            return;
        }

        bytes_written += file->WriteString(FormatLogMessage(entry).append(1, '\n'));

        using namespace Common::Literals;
        // Prevent logs from exceeding a set maximum size in the event that log entries are spammed.
        const auto write_limit = Settings::values.extended_logging ? 1_GiB : 100_MiB;
        const bool write_limit_exceeded = bytes_written > write_limit;
        if (entry.log_level >= Level::Error || write_limit_exceeded) {
            if (write_limit_exceeded) {
                // Stop writing after the write limit is exceeded.
                // Don't close the file so we can print a stacktrace if necessary
                enabled = false;
            }
            file->Flush();
        }
    }

    void Flush() override {
        file->Flush();
    }

    void EnableForStacktrace() override {
        enabled = true;
        bytes_written = 0;
    }

private:
    std::unique_ptr<FS::IOFile> file;
    bool enabled = true;
    std::size_t bytes_written = 0;
};

/**
 * Backend that writes to Visual Studio's output window
 */
class DebuggerBackend final : public Backend {
public:
    explicit DebuggerBackend() = default;

    ~DebuggerBackend() override = default;

    void Write(const Entry& entry) override {
#ifdef _WIN32
        ::OutputDebugStringW(UTF8ToUTF16W(FormatLogMessage(entry).append(1, '\n')).c_str());
#endif
    }

    void Flush() override {}

    void EnableForStacktrace() override {}
};

bool initialization_in_progress_suppress_logging = true;

/**
 * Static state as a singleton.
 */
class Impl {
public:
    static Impl& Instance() {
        if (!instance) {
            throw std::runtime_error("Using Logging instance before its initialization");
        }
        return *instance;
    }

    static void Initialize() {
        if (instance) {
            LOG_WARNING(Log, "Reinitializing logging backend");
            return;
        }
        using namespace Common::FS;
        const auto& log_dir = GetYuzuPath(YuzuPath::LogDir);
        void(CreateDir(log_dir));
        Filter filter;
        filter.ParseFilterString(Settings::values.log_filter.GetValue());
        instance = std::unique_ptr<Impl, decltype(&Deleter)>(new Impl(log_dir / LOG_FILE, filter),
                                                             Deleter);
        initialization_in_progress_suppress_logging = false;
    }

    static void Start() {
        instance->StartBackendThread();
    }

    Impl(const Impl&) = delete;
    Impl& operator=(const Impl&) = delete;

    Impl(Impl&&) = delete;
    Impl& operator=(Impl&&) = delete;

    void SetGlobalFilter(const Filter& f) {
        filter = f;
    }

    void SetColorConsoleBackendEnabled(bool enabled) {
        color_console_backend.SetEnabled(enabled);
    }

    void PushEntry(Class log_class, Level log_level, const char* filename, unsigned int line_num,
                   const char* function, std::string&& message) {
        if (!filter.CheckMessage(log_class, log_level))
            return;
        const Entry& entry =
            CreateEntry(log_class, log_level, filename, line_num, function, std::move(message));
        message_queue.Push(entry);
    }

private:
    Impl(const std::filesystem::path& file_backend_filename, const Filter& filter_)
        : filter{filter_}, file_backend{file_backend_filename} {}

    ~Impl() = default;

    void StartBackendThread() {
        backend_thread = std::jthread([this](std::stop_token stop_token) {
            Common::SetCurrentThreadName("yuzu:Log");
            Entry entry;
            const auto write_logs = [this, &entry]() {
                ForEachBackend([&entry](Backend& backend) { backend.Write(entry); });
            };
            while (!stop_token.stop_requested()) {
                entry = message_queue.PopWait(stop_token);
                if (entry.filename != nullptr) {
                    write_logs();
                }
            }
            // Drain the logging queue. Only writes out up to MAX_LOGS_TO_WRITE to prevent a
            // case where a system is repeatedly spamming logs even on close.
            int max_logs_to_write = filter.IsDebug() ? INT_MAX : 100;
            while (max_logs_to_write-- && message_queue.Pop(entry)) {
                write_logs();
            }
        });
    }

    Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
                      const char* function, std::string&& message) const {
        using std::chrono::duration_cast;
        using std::chrono::microseconds;
        using std::chrono::steady_clock;

        return {
            .timestamp = duration_cast<microseconds>(steady_clock::now() - time_origin),
            .log_class = log_class,
            .log_level = log_level,
            .filename = filename,
            .line_num = line_nr,
            .function = function,
            .message = std::move(message),
        };
    }

    void ForEachBackend(auto lambda) {
        lambda(static_cast<Backend&>(debugger_backend));
        lambda(static_cast<Backend&>(color_console_backend));
        lambda(static_cast<Backend&>(file_backend));
    }

    static void Deleter(Impl* ptr) {
        delete ptr;
    }

    static inline std::unique_ptr<Impl, decltype(&Deleter)> instance{nullptr, Deleter};

    Filter filter;
    DebuggerBackend debugger_backend{};
    ColorConsoleBackend color_console_backend{};
    FileBackend file_backend;

    std::jthread backend_thread;
    MPSCQueue<Entry, true> message_queue{};
    std::chrono::steady_clock::time_point time_origin{std::chrono::steady_clock::now()};
};
} // namespace

void Initialize() {
    Impl::Initialize();
}

void Start() {
    Impl::Start();
}

void DisableLoggingInTests() {
    initialization_in_progress_suppress_logging = true;
}

void SetGlobalFilter(const Filter& filter) {
    Impl::Instance().SetGlobalFilter(filter);
}

void SetColorConsoleBackendEnabled(bool enabled) {
    Impl::Instance().SetColorConsoleBackendEnabled(enabled);
}

void FmtLogMessageImpl(Class log_class, Level log_level, const char* filename,
                       unsigned int line_num, const char* function, const char* format,
                       const fmt::format_args& args) {
    if (!initialization_in_progress_suppress_logging) {
        Impl::Instance().PushEntry(log_class, log_level, filename, line_num, function,
                                   fmt::vformat(format, args));
    }
}
} // namespace Common::Log