text: // Copyright (c) 2016-2020, The Monero Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
  
  #include <boost/filesystem.hpp>
  #include "gtest/gtest.h"
  #include "contrib/epee/include/file_io_utils.h"
  #include "contrib/epee/include/misc_log_ex.h"
  
  static std::string log_filename;
  
  static void init()
  {
    boost::filesystem::path p = boost::filesystem::temp_directory_path() / boost::filesystem::unique_path();
    log_filename = p.string();
    mlog_configure(log_filename, false, 0);
  }
  
  static void cleanup()
  {
    // windows does not let files be deleted if still in use, so leave droppings there
  #ifndef _WIN32
    boost::filesystem::remove(log_filename);
  #endif
  }
  
  static size_t nlines(const std::string &str)
  {
    size_t n = 0;
    for (const char *ptr = str.c_str(); *ptr; ++ptr)
      if (*ptr == '\n')
        ++n;
    return n;
  }
  
  static bool load_log_to_string(const std::string &filename, std::string &str)
  {
    if (!epee::file_io_utils::load_file_to_string(filename, str))
      return false;
    for (const char *ptr = str.c_str(); *ptr; ++ptr)
    {
      if (*ptr == '\n')
      {
        std::string prefix = std::string(str.c_str(), ptr - str.c_str());
        if (prefix.find("New log categories:") != std::string::npos)
        {
          str = std::string(ptr + 1, strlen(ptr + 1));
          break;
        }
      }
    }
    return true;
  }
  
  static void log()
  {
    MFATAL("fatal");
    MERROR("error");
    MWARNING("warning");
    MINFO("info");
    MDEBUG("debug");
    MTRACE("trace");
  
    MCINFO("a.b.c.d", "a.b.c.d");
    MCINFO("a.b.c.e", "a.b.c.e");
    MCINFO("global", "global");
    MCINFO("x.y.z", "x.y.z");
    MCINFO("y.y.z", "y.y.z");
    MCINFO("x.y.x", "x.y.x");
  }
  
  TEST(logging, no_logs)
  {
    init();
    mlog_set_categories("");
    log();
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(str == "");
    cleanup();
  }
  
  TEST(logging, default)
  {
    init();
    log();
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(str.find("global") != std::string::npos);
    ASSERT_TRUE(str.find("fatal") != std::string::npos);
    ASSERT_TRUE(str.find("error") != std::string::npos);
    ASSERT_TRUE(str.find("debug") == std::string::npos);
    ASSERT_TRUE(str.find("trace") == std::string::npos);
    cleanup();
  }
  
  TEST(logging, all)
  {
    init();
    mlog_set_categories("*:TRACE");
    log();
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(str.find("global") != std::string::npos);
    ASSERT_TRUE(str.find("fatal") != std::string::npos);
    ASSERT_TRUE(str.find("error") != std::string::npos);
    ASSERT_TRUE(str.find("debug") != std::string::npos);
    ASSERT_TRUE(str.find("trace") != std::string::npos);
    cleanup();
  }
  
  TEST(logging, glob_suffix)
  {
    init();
    mlog_set_categories("x.y*:TRACE");
    log();
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(str.find("global") == std::string::npos);
    ASSERT_TRUE(str.find("x.y.z") != std::string::npos);
    ASSERT_TRUE(str.find("x.y.x") != std::string::npos);
    ASSERT_TRUE(str.find("y.y.z") == std::string::npos);
    cleanup();
  }
  
  TEST(logging, glob_prefix)
  {
    init();
    mlog_set_categories("*y.z:TRACE");
    log();
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(str.find("global") == std::string::npos);
    ASSERT_TRUE(str.find("x.y.z") != std::string::npos);
    ASSERT_TRUE(str.find("x.y.x") == std::string::npos);
    ASSERT_TRUE(str.find("y.y.z") != std::string::npos);
    cleanup();
  }
  
  TEST(logging, last_precedence)
  {
    init();
    mlog_set_categories("gobal:FATAL,glo*:DEBUG");
    log();
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(nlines(str) == 1);
    ASSERT_TRUE(str.find("global") != std::string::npos);
    ASSERT_TRUE(str.find("x.y.z") == std::string::npos);
    ASSERT_TRUE(str.find("x.y.x") == std::string::npos);
    ASSERT_TRUE(str.find("y.y.z") == std::string::npos);
    cleanup();
  }
  
  TEST(logging, multiline)
  {
    init();
    mlog_set_categories("global:INFO");
    MGINFO("first\nsecond\nthird");
    std::string str;
    ASSERT_TRUE(load_log_to_string(log_filename, str));
    ASSERT_TRUE(nlines(str) == 3);
    ASSERT_TRUE(str.find("global") != std::string::npos);
    ASSERT_TRUE(str.find("first") != std::string::npos);
    ASSERT_TRUE(str.find("second") != std::string::npos);
    ASSERT_TRUE(str.find("third") != std::string::npos);
    ASSERT_TRUE(str.find("first\nsecond") == std::string::npos);
    ASSERT_TRUE(str.find("second\nthird") == std::string::npos);
    cleanup();
  }
  
  