78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
//
|
|
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
#pragma once
|
|
|
|
#include "td/utils/common.h"
|
|
#include "td/utils/logging.h"
|
|
#include "td/utils/Slice.h"
|
|
|
|
#include <atomic>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
|
|
namespace td {
|
|
template <int buffer_size = 32 * (1 << 10)>
|
|
class MemoryLog : public LogInterface {
|
|
static constexpr size_t MAX_OUTPUT_SIZE = buffer_size / 16 < (8 << 10) ? buffer_size / 16 : (8 << 10);
|
|
|
|
public:
|
|
MemoryLog() {
|
|
std::memset(buffer_, ' ', sizeof(buffer_));
|
|
}
|
|
|
|
void append(CSlice new_slice, int log_level) override {
|
|
Slice slice = new_slice;
|
|
slice.truncate(MAX_OUTPUT_SIZE);
|
|
while (!slice.empty() && slice.back() == '\n') {
|
|
slice.remove_suffix(1);
|
|
}
|
|
size_t slice_size = slice.size();
|
|
CHECK(slice_size * 3 < buffer_size);
|
|
size_t pad_size = ((slice_size + 15) & ~15) - slice_size;
|
|
constexpr size_t magic_size = 16;
|
|
uint32 total_size = static_cast<uint32>(slice_size + pad_size + magic_size);
|
|
uint32 real_pos = pos_.fetch_add(total_size, std::memory_order_relaxed);
|
|
CHECK((total_size & 15) == 0);
|
|
|
|
uint32 start_pos = real_pos & (buffer_size - 1);
|
|
uint32 end_pos = start_pos + total_size;
|
|
if (likely(end_pos <= buffer_size)) {
|
|
std::memcpy(&buffer_[start_pos + magic_size], slice.data(), slice_size);
|
|
std::memcpy(&buffer_[start_pos + magic_size + slice_size], " ", pad_size);
|
|
} else {
|
|
size_t first = buffer_size - start_pos - magic_size;
|
|
size_t second = slice_size - first;
|
|
std::memcpy(&buffer_[start_pos + magic_size], slice.data(), first);
|
|
std::memcpy(&buffer_[0], slice.data() + first, second);
|
|
std::memcpy(&buffer_[second], " ", pad_size);
|
|
}
|
|
|
|
CHECK((start_pos & 15) == 0);
|
|
CHECK(start_pos <= buffer_size - magic_size);
|
|
buffer_[start_pos] = '\n';
|
|
size_t printed = std::snprintf(&buffer_[start_pos + 1], magic_size - 1, "LOG:%08x: ", real_pos);
|
|
CHECK(printed == magic_size - 2);
|
|
buffer_[start_pos + magic_size - 1] = ' ';
|
|
}
|
|
|
|
void rotate() override {
|
|
}
|
|
|
|
Slice get_buffer() const {
|
|
return Slice(buffer_, sizeof(buffer_));
|
|
}
|
|
|
|
size_t get_pos() const {
|
|
return pos_ & (buffer_size - 1);
|
|
}
|
|
|
|
private:
|
|
char buffer_[buffer_size];
|
|
std::atomic<uint32> pos_;
|
|
};
|
|
} // namespace td
|