summaryrefslogtreecommitdiffstats
path: root/src/common/logging/backend.cpp
blob: 04bc3128f5acc758a817ffed03e061f0809445e2 (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
314
315
316
317
318
319
320
321
322
323
324
325
326
327
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <atomic>
#include <chrono>
#include <climits>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <thread>
#include <vector>
#ifdef _WIN32
#include <share.h>   // For _SH_DENYWR
#include <windows.h> // For OutputDebugStringW
#else
#define _SH_DENYWR 0
#endif
#include "common/assert.h"
#include "common/logging/backend.h"
#include "common/logging/log.h"
#include "common/logging/text_formatter.h"
#include "common/string_util.h"
#include "common/threadsafe_queue.h"

namespace Log {

/**
 * Static state as a singleton.
 */
class Impl {
public:
    static Impl& Instance() {
        static Impl backend;
        return backend;
    }

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

    void PushEntry(Class log_class, Level log_level, const char* filename, unsigned int line_num,
                   const char* function, std::string message) {
        message_queue.Push(
            CreateEntry(log_class, log_level, filename, line_num, function, std::move(message)));
    }

    void AddBackend(std::unique_ptr<Backend> backend) {
        std::lock_guard lock{writing_mutex};
        backends.push_back(std::move(backend));
    }

    void RemoveBackend(std::string_view backend_name) {
        std::lock_guard lock{writing_mutex};
        const auto it =
            std::remove_if(backends.begin(), backends.end(),
                           [&backend_name](const auto& i) { return backend_name == i->GetName(); });
        backends.erase(it, backends.end());
    }

    const Filter& GetGlobalFilter() const {
        return filter;
    }

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

    Backend* GetBackend(std::string_view backend_name) {
        const auto it =
            std::find_if(backends.begin(), backends.end(),
                         [&backend_name](const auto& i) { return backend_name == i->GetName(); });
        if (it == backends.end())
            return nullptr;
        return it->get();
    }

private:
    Impl() {
        backend_thread = std::thread([&] {
            Entry entry;
            auto write_logs = [&](Entry& e) {
                std::lock_guard lock{writing_mutex};
                for (const auto& backend : backends) {
                    backend->Write(e);
                }
            };
            while (true) {
                entry = message_queue.PopWait();
                if (entry.final_entry) {
                    break;
                }
                write_logs(entry);
            }

            // 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.
            const int MAX_LOGS_TO_WRITE = filter.IsDebug() ? INT_MAX : 100;
            int logs_written = 0;
            while (logs_written++ < MAX_LOGS_TO_WRITE && message_queue.Pop(entry)) {
                write_logs(entry);
            }
        });
    }

    ~Impl() {
        Entry entry;
        entry.final_entry = true;
        message_queue.Push(entry);
        backend_thread.join();
    }

    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::steady_clock;

        Entry entry;
        entry.timestamp =
            duration_cast<std::chrono::microseconds>(steady_clock::now() - time_origin);
        entry.log_class = log_class;
        entry.log_level = log_level;
        entry.filename = filename;
        entry.line_num = line_nr;
        entry.function = function;
        entry.message = std::move(message);

        return entry;
    }

    std::mutex writing_mutex;
    std::thread backend_thread;
    std::vector<std::unique_ptr<Backend>> backends;
    Common::MPSCQueue<Log::Entry> message_queue;
    Filter filter;
    std::chrono::steady_clock::time_point time_origin{std::chrono::steady_clock::now()};
};

void ConsoleBackend::Write(const Entry& entry) {
    PrintMessage(entry);
}

void ColorConsoleBackend::Write(const Entry& entry) {
    PrintColoredMessage(entry);
}

// _SH_DENYWR allows read only access to the file for other programs.
// It is #defined to 0 on other platforms
FileBackend::FileBackend(const std::string& filename)
    : file(filename, "w", _SH_DENYWR), bytes_written(0) {}

void FileBackend::Write(const Entry& entry) {
    // prevent logs from going over the maximum size (in case its spamming and the user doesn't
    // know)
    constexpr std::size_t MAX_BYTES_WRITTEN = 50 * 1024L * 1024L;
    if (!file.IsOpen() || bytes_written > MAX_BYTES_WRITTEN) {
        return;
    }
    bytes_written += file.WriteString(FormatLogMessage(entry).append(1, '\n'));
    if (entry.log_level >= Level::Error) {
        file.Flush();
    }
}

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

/// Macro listing all log classes. Code should define CLS and SUB as desired before invoking this.
#define ALL_LOG_CLASSES()                                                                          \
    CLS(Log)                                                                                       \
    CLS(Common)                                                                                    \
    SUB(Common, Filesystem)                                                                        \
    SUB(Common, Memory)                                                                            \
    CLS(Core)                                                                                      \
    SUB(Core, ARM)                                                                                 \
    SUB(Core, Timing)                                                                              \
    CLS(Config)                                                                                    \
    CLS(Debug)                                                                                     \
    SUB(Debug, Emulated)                                                                           \
    SUB(Debug, GPU)                                                                                \
    SUB(Debug, Breakpoint)                                                                         \
    SUB(Debug, GDBStub)                                                                            \
    CLS(Kernel)                                                                                    \
    SUB(Kernel, SVC)                                                                               \
    CLS(Service)                                                                                   \
    SUB(Service, ACC)                                                                              \
    SUB(Service, Audio)                                                                            \
    SUB(Service, AM)                                                                               \
    SUB(Service, AOC)                                                                              \
    SUB(Service, APM)                                                                              \
    SUB(Service, ARP)                                                                              \
    SUB(Service, BCAT)                                                                             \
    SUB(Service, BPC)                                                                              \
    SUB(Service, BTDRV)                                                                            \
    SUB(Service, BTM)                                                                              \
    SUB(Service, Capture)                                                                          \
    SUB(Service, ERPT)                                                                             \
    SUB(Service, ETicket)                                                                          \
    SUB(Service, EUPLD)                                                                            \
    SUB(Service, Fatal)                                                                            \
    SUB(Service, FGM)                                                                              \
    SUB(Service, Friend)                                                                           \
    SUB(Service, FS)                                                                               \
    SUB(Service, GRC)                                                                              \
    SUB(Service, HID)                                                                              \
    SUB(Service, IRS)                                                                              \
    SUB(Service, LBL)                                                                              \
    SUB(Service, LDN)                                                                              \
    SUB(Service, LDR)                                                                              \
    SUB(Service, LM)                                                                               \
    SUB(Service, Migration)                                                                        \
    SUB(Service, Mii)                                                                              \
    SUB(Service, MM)                                                                               \
    SUB(Service, NCM)                                                                              \
    SUB(Service, NFC)                                                                              \
    SUB(Service, NFP)                                                                              \
    SUB(Service, NIFM)                                                                             \
    SUB(Service, NIM)                                                                              \
    SUB(Service, NPNS)                                                                             \
    SUB(Service, NS)                                                                               \
    SUB(Service, NVDRV)                                                                            \
    SUB(Service, PCIE)                                                                             \
    SUB(Service, PCTL)                                                                             \
    SUB(Service, PCV)                                                                              \
    SUB(Service, PM)                                                                               \
    SUB(Service, PREPO)                                                                            \
    SUB(Service, PSC)                                                                              \
    SUB(Service, PSM)                                                                              \
    SUB(Service, SET)                                                                              \
    SUB(Service, SM)                                                                               \
    SUB(Service, SPL)                                                                              \
    SUB(Service, SSL)                                                                              \
    SUB(Service, TCAP)                                                                             \
    SUB(Service, Time)                                                                             \
    SUB(Service, USB)                                                                              \
    SUB(Service, VI)                                                                               \
    SUB(Service, WLAN)                                                                             \
    CLS(HW)                                                                                        \
    SUB(HW, Memory)                                                                                \
    SUB(HW, LCD)                                                                                   \
    SUB(HW, GPU)                                                                                   \
    SUB(HW, AES)                                                                                   \
    CLS(IPC)                                                                                       \
    CLS(Frontend)                                                                                  \
    CLS(Render)                                                                                    \
    SUB(Render, Software)                                                                          \
    SUB(Render, OpenGL)                                                                            \
    SUB(Render, Vulkan)                                                                            \
    CLS(Audio)                                                                                     \
    SUB(Audio, DSP)                                                                                \
    SUB(Audio, Sink)                                                                               \
    CLS(Input)                                                                                     \
    CLS(Network)                                                                                   \
    CLS(Loader)                                                                                    \
    CLS(CheatEngine)                                                                               \
    CLS(Crypto)                                                                                    \
    CLS(WebService)

// GetClassName is a macro defined by Windows.h, grrr...
const char* GetLogClassName(Class log_class) {
    switch (log_class) {
#define CLS(x)                                                                                     \
    case Class::x:                                                                                 \
        return #x;
#define SUB(x, y)                                                                                  \
    case Class::x##_##y:                                                                           \
        return #x "." #y;
        ALL_LOG_CLASSES()
#undef CLS
#undef SUB
    case Class::Count:
        break;
    }
    UNREACHABLE();
    return "Invalid";
}

const char* GetLevelName(Level log_level) {
#define LVL(x)                                                                                     \
    case Level::x:                                                                                 \
        return #x
    switch (log_level) {
        LVL(Trace);
        LVL(Debug);
        LVL(Info);
        LVL(Warning);
        LVL(Error);
        LVL(Critical);
    case Level::Count:
        break;
    }
#undef LVL
    UNREACHABLE();
    return "Invalid";
}

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

void AddBackend(std::unique_ptr<Backend> backend) {
    Impl::Instance().AddBackend(std::move(backend));
}

void RemoveBackend(std::string_view backend_name) {
    Impl::Instance().RemoveBackend(backend_name);
}

Backend* GetBackend(std::string_view backend_name) {
    return Impl::Instance().GetBackend(backend_name);
}

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) {
    auto& instance = Impl::Instance();
    const auto& filter = instance.GetGlobalFilter();
    if (!filter.CheckMessage(log_class, log_level))
        return;

    instance.PushEntry(log_class, log_level, filename, line_num, function,
                       fmt::vformat(format, args));
}
} // namespace Log