chrome/tools/crash_service/caps/logger_win.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <windows.h>
   6 #include <time.h>
   7
   8 #include "base/files/file_path.h"
   9 #include "base/strings/stringprintf.h"
  10 #include "chrome/tools/crash_service/caps/logger_win.h"
  11 #include "components/version_info/version_info_values.h"
  12
  13 namespace {
  14 // Every message has this structure:
  15 // <index>~ <tick_count> <message> ~\n"
  16 const char kMessageHeader[] = "%03d~ %08x %s ~\n";
  17
  18 // Do not re-order these messages. Only add at the end.
  19 const char* kMessages[] {
  20   "start pid(%lu) version(%s) time(%s)",                    // 0
  21   "exit pid(%lu) time(%s)",                                 // 1
  22   "instance found",                                         // 2
  23 };
  24
  25 bool WriteLogLine(HANDLE file, const std::string& txt) {
  26   if (txt.empty())
  27     return true;
  28   DWORD written;
  29   auto rc = ::WriteFile(file, txt.c_str(),
  30                         static_cast<DWORD>(txt.size()),
  31                         &written,
  32                         nullptr);
  33   return (rc == TRUE);
  34 }
  35
  36 // Uses |kMessages| at |index| above to write to disk a formatted log line.
  37 bool WriteFormattedLogLine(HANDLE file, size_t index, ...) {
  38   va_list ap;
  39   va_start(ap, index);
  40   auto fmt = base::StringPrintf(
  41       kMessageHeader, index, ::GetTickCount(), kMessages[index]);
  42   auto msg = base::StringPrintV(fmt.c_str(), ap);
  43   auto rc = WriteLogLine(file, msg.c_str());
  44   va_end(ap);
  45   return rc;
  46 }
  47
  48 // Returns the current time and date formatted in standard C style.
  49 std::string DateTime() {
  50   time_t current_time = 0;
  51   time(&current_time);
  52   struct tm local_time = {0};
  53   char time_buf[26] = {0};
  54   localtime_s(&local_time, &current_time);
  55   asctime_s(time_buf, &local_time);
  56   time_buf[24] = '\0';
  57   return time_buf;
  58 }
  59
  60 }  // namespace
  61
  62 namespace caps {
  63
  64 Logger::Logger(const base::FilePath& path) : file_(INVALID_HANDLE_VALUE) {
  65   auto logfile = path.Append(L"caps_log.txt");
  66   // Opening a file like so allows atomic appends, but can't be used
  67   // for anything else.
  68   DWORD kShareAll = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
  69   file_ = ::CreateFile(logfile.value().c_str(),
  70                        FILE_APPEND_DATA, kShareAll,
  71                        nullptr,
  72                        OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL,
  73                        nullptr);
  74   if (file_ == INVALID_HANDLE_VALUE)
  75     return;
  76   WriteFormattedLogLine(
  77       file_, 0, ::GetCurrentProcessId(), PRODUCT_VERSION, DateTime().c_str());
  78 }
  79
  80 Logger::~Logger() {
  81   if (file_ != INVALID_HANDLE_VALUE) {
  82     WriteFormattedLogLine(
  83         file_, 1, ::GetCurrentProcessId(), DateTime().c_str());
  84     ::CloseHandle(file_);
  85   }
  86 }
  87
  88 }  // namespace caps
  89