File: win_logger.cc

package info (click to toggle)
rocksdb 5.17.2-3
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 21,164 kB
  • sloc: cpp: 253,035; java: 24,114; perl: 5,769; python: 4,093; ansic: 4,092; sh: 3,861; makefile: 1,754; asm: 547; php: 254; xml: 30
file content (192 lines) | stat: -rw-r--r-- 5,320 bytes parent folder | download | duplicates (13)
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
//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// Logger implementation that can be shared by all environments
// where enough posix functionality is available.

#include "port/win/win_logger.h"
#include "port/win/io_win.h"

#include <algorithm>
#include <stdio.h>
#include <time.h>
#include <fcntl.h>
#include <atomic>

#include "rocksdb/env.h"

#include "monitoring/iostats_context_imp.h"
#include "port/sys_time.h"

namespace rocksdb {

namespace port {

WinLogger::WinLogger(uint64_t (*gettid)(), Env* env, HANDLE file,
                     const InfoLogLevel log_level)
    : Logger(log_level),
      file_(file),
      gettid_(gettid),
      log_size_(0),
      last_flush_micros_(0),
      env_(env),
      flush_pending_(false) {
  assert(file_ != NULL);
  assert(file_ != INVALID_HANDLE_VALUE);
}

void WinLogger::DebugWriter(const char* str, int len) {
  assert(file_ != INVALID_HANDLE_VALUE);
  DWORD bytesWritten = 0;
  BOOL ret = WriteFile(file_, str, len, &bytesWritten, NULL);
  if (ret == FALSE) {
    std::string errSz = GetWindowsErrSz(GetLastError());
    fprintf(stderr, errSz.c_str());
  }
}

WinLogger::~WinLogger() { 
  CloseInternal();
}

Status WinLogger::CloseImpl() {
  return CloseInternal();
}

Status WinLogger::CloseInternal() {
  Status s;
  if (INVALID_HANDLE_VALUE != file_) {
    BOOL ret = FlushFileBuffers(file_);
    if (ret == 0) {
      auto lastError = GetLastError();
      s = IOErrorFromWindowsError("Failed to flush LOG on Close() ", 
        lastError);
    }
    ret = CloseHandle(file_);
    // On error the return value is zero
    if (ret == 0 && s.ok()) {
      auto lastError = GetLastError();
      s = IOErrorFromWindowsError("Failed to flush LOG on Close() ", 
        lastError);
    }
    file_ = INVALID_HANDLE_VALUE;
    closed_ = true;
  }
  return s;
}

void WinLogger::Flush() {
  assert(file_ != INVALID_HANDLE_VALUE);
  if (flush_pending_) {
    flush_pending_ = false;
    // With Windows API writes go to OS buffers directly so no fflush needed
    // unlike with C runtime API. We don't flush all the way to disk
    // for perf reasons.
  }

  last_flush_micros_ = env_->NowMicros();
}

void WinLogger::Logv(const char* format, va_list ap) {
  IOSTATS_TIMER_GUARD(logger_nanos);
  assert(file_ != INVALID_HANDLE_VALUE);

  const uint64_t thread_id = (*gettid_)();

  // We try twice: the first time with a fixed-size stack allocated buffer,
  // and the second time with a much larger dynamically allocated buffer.
  char buffer[500];
  std::unique_ptr<char[]> largeBuffer;
  for (int iter = 0; iter < 2; ++iter) {
    char* base;
    int bufsize;
    if (iter == 0) {
      bufsize = sizeof(buffer);
      base = buffer;
    } else {
      bufsize = 30000;
      largeBuffer.reset(new char[bufsize]);
      base = largeBuffer.get();
    }

    char* p = base;
    char* limit = base + bufsize;

    struct timeval now_tv;
    gettimeofday(&now_tv, nullptr);
    const time_t seconds = now_tv.tv_sec;
    struct tm t;
    localtime_s(&t, &seconds);
    p += snprintf(p, limit - p, "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
                  t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour,
                  t.tm_min, t.tm_sec, static_cast<int>(now_tv.tv_usec),
                  static_cast<long long unsigned int>(thread_id));

    // Print the message
    if (p < limit) {
      va_list backup_ap;
      va_copy(backup_ap, ap);
      int done = vsnprintf(p, limit - p, format, backup_ap);
      if (done > 0) {
        p += done;
      } else {
        continue;
      }
      va_end(backup_ap);
    }

    // Truncate to available space if necessary
    if (p >= limit) {
      if (iter == 0) {
        continue;  // Try again with larger buffer
      } else {
        p = limit - 1;
      }
    }

    // Add newline if necessary
    if (p == base || p[-1] != '\n') {
      *p++ = '\n';
    }

    assert(p <= limit);
    const size_t write_size = p - base;

    DWORD bytesWritten = 0;
    BOOL ret = WriteFile(file_, base, static_cast<DWORD>(write_size),
      &bytesWritten, NULL);
    if (ret == FALSE) {
      std::string errSz = GetWindowsErrSz(GetLastError());
      fprintf(stderr, errSz.c_str());
    }

    flush_pending_ = true;
    assert((bytesWritten == write_size) || (ret == FALSE));
    if (bytesWritten > 0) {
      log_size_ += write_size;
    }

    uint64_t now_micros =
        static_cast<uint64_t>(now_tv.tv_sec) * 1000000 + now_tv.tv_usec;
    if (now_micros - last_flush_micros_ >= flush_every_seconds_ * 1000000) {
      flush_pending_ = false;
      // With Windows API writes go to OS buffers directly so no fflush needed
      // unlike with C runtime API. We don't flush all the way to disk
      // for perf reasons.
      last_flush_micros_ = now_micros;
    }
    break;
  }
}

size_t WinLogger::GetLogFileSize() const { return log_size_; }

}

}  // namespace rocksdb