Logger.cpp

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/*
 * Copyright 2019 OmniSci, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

bool g_enable_debug_timer{false};

#ifndef __CUDACC__

#include "Logger.h"
#include "StringTransform.h"

#include <boost/algorithm/string.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sinks.hpp>
#include <boost/log/sources/global_logger_storage.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/sources/severity_feature.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/log/utility/setup.hpp>
#include <boost/phoenix.hpp>
#include <boost/variant.hpp>

#include <atomic>
#include <cstdlib>
#include <iostream>
#include <mutex>
#include <regex>

namespace logger {

namespace attr = boost::log::attributes;
namespace expr = boost::log::expressions;
namespace keywords = boost::log::keywords;
namespace sinks = boost::log::sinks;
namespace sources = boost::log::sources;
namespace po = boost::program_options;

BOOST_LOG_ATTRIBUTE_KEYWORD(process_id, "ProcessID", attr::current_process_id::value_type)
BOOST_LOG_ATTRIBUTE_KEYWORD(channel, "Channel", Channel)
BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", Severity)

BOOST_LOG_GLOBAL_LOGGER_DEFAULT(gChannelLogger, ChannelLogger)
BOOST_LOG_GLOBAL_LOGGER_DEFAULT(gSeverityLogger, SeverityLogger)

// Return last component of path
std::string filename(char const* path) {
  return boost::filesystem::path(path).filename().string();
}

LogOptions::LogOptions(char const* argv0) : options_("Logging") {
  // Log file base_name matches name of program.
  std::string const base_name =
      argv0 == nullptr ? std::string("omnisci_server") : filename(argv0);
  file_name_pattern_ = base_name + file_name_pattern_;
  symlink_ = base_name + symlink_;
  std::string const channels = join(ChannelNames, " ");
  // Filter out DEBUG[1-4] severities from --help options
  std::string severities;
  for (auto const& name : SeverityNames) {
    if (!boost::algorithm::starts_with(name, "DEBUG")) {
      (severities += (severities.empty() ? "" : " ")) += name;
    }
  }
  options_.add_options()(
      "log-directory",
      po::value<boost::filesystem::path>(&log_dir_)->default_value(log_dir_),
      "Logging directory. May be relative to data directory, or absolute.");
  options_.add_options()(
      "log-file-name",
      po::value<std::string>(&file_name_pattern_)->default_value(file_name_pattern_),
      "Log file name relative to log-directory.");
  options_.add_options()("log-symlink",
                         po::value<std::string>(&symlink_)->default_value(symlink_),
                         "Symlink to active log.");
  options_.add_options()("log-severity",
                         po::value<Severity>(&severity_)->default_value(severity_),
                         ("Log to file severity level: " + severities).c_str());
  options_.add_options()(
      "log-severity-clog",
      po::value<Severity>(&severity_clog_)->default_value(severity_clog_),
      ("Log to console severity level: " + severities).c_str());
  options_.add_options()("log-channels",
                         po::value<Channels>(&channels_)->default_value(channels_),
                         ("Log channel debug info: " + channels).c_str());
  options_.add_options()("log-auto-flush",
                         po::value<bool>(&auto_flush_)->default_value(auto_flush_),
                         "Flush logging buffer to file after each message.");
  options_.add_options()("log-max-files",
                         po::value<size_t>(&max_files_)->default_value(max_files_),
                         "Maximum number of log files to keep.");
  options_.add_options()(
      "log-min-free-space",
      po::value<size_t>(&min_free_space_)->default_value(20 << 20),
      "Minimum number of bytes left on device before oldest log files are deleted.");
  options_.add_options()("log-rotate-daily",
                         po::value<bool>(&rotate_daily_)->default_value(true),
                         "Start new log files at midnight.");
  options_.add_options()("log-rotation-size",
                         po::value<size_t>(&rotation_size_)->default_value(10 << 20),
                         "Maximum file size in bytes before new log files are started.");
}

boost::filesystem::path LogOptions::full_log_dir() const {
  return log_dir_.has_root_directory() ? log_dir_ : base_path_ / log_dir_;
}

po::options_description const& LogOptions::get_options() const {
  return options_;
}

// Typical usage calls either get_options() or parse_command_line() but not both.
void LogOptions::parse_command_line(int argc, char const* const* argv) {
  po::variables_map vm;
  po::store(
      po::command_line_parser(argc, argv).options(options_).allow_unregistered().run(),
      vm);
  po::notify(vm);  // Sets LogOptions member variables.
}

// Must be called before init() to take effect.
void LogOptions::set_base_path(std::string const& base_path) {
  base_path_ = base_path;
}

template <typename TAG>
std::string replace_braces(std::string const& str, TAG const tag) {
  constexpr std::regex::flag_type flags = std::regex::ECMAScript | std::regex::optimize;
  static std::regex const regex(R"(\{SEVERITY\})", flags);
  if /*constexpr*/ (std::is_same<TAG, Channel>::value) {
    return std::regex_replace(str, regex, ChannelNames[tag]);
  } else {
    return std::regex_replace(str, regex, SeverityNames[tag]);
  }
}

// Print decimal value for process_id (14620) instead of hex (0x0000391c)
boost::log::attributes::current_process_id::value_type::native_type get_native_process_id(
    boost::log::value_ref<boost::log::attributes::current_process_id::value_type,
                          tag::process_id> const& pid) {
  return pid ? pid->native_id() : 0;
}

template <typename SINK>
sinks::text_file_backend::open_handler_type create_or_replace_symlink(
    boost::weak_ptr<SINK> weak_ptr,
    std::string&& symlink) {
  namespace fs = boost::filesystem;
  return [weak_ptr,
          symlink = std::move(symlink)](sinks::text_file_backend::stream_type& stream) {
    if (boost::shared_ptr<SINK> sink = weak_ptr.lock()) {
      boost::system::error_code ec;
      fs::path const& file_name = sink->locked_backend()->get_current_file_name();
      fs::path const symlink_path = file_name.parent_path() / symlink;
      fs::remove(symlink_path, ec);
      if (ec) {
        stream << filename(__FILE__) << ':' << __LINE__ << ' ' << ec.message() << '\n';
      }
      fs::create_symlink(file_name.filename(), symlink_path, ec);
      if (ec) {
        stream << filename(__FILE__) << ':' << __LINE__ << ' ' << ec.message() << '\n';
      }
    }
  };
}

boost::log::formatting_ostream& operator<<(
    boost::log::formatting_ostream& strm,
    boost::log::to_log_manip<Channel, tag::channel> const& manip) {
  return strm << ChannelSymbols[manip.get()];
}

boost::log::formatting_ostream& operator<<(
    boost::log::formatting_ostream& strm,
    boost::log::to_log_manip<Severity, tag::severity> const& manip) {
  return strm << SeveritySymbols[manip.get()];
}

template <typename TAG, typename SINK>
void set_formatter(SINK& sink) {
  if /*constexpr*/ (std::is_same<TAG, Channel>::value) {
    sink->set_formatter(
        expr::stream << expr::format_date_time<boost::posix_time::ptime>(
                            "TimeStamp", "%Y-%m-%dT%H:%M:%S.%f")
                     << ' ' << channel << ' '
                     << boost::phoenix::bind(&get_native_process_id, process_id.or_none())
                     << ' ' << expr::smessage);
  } else {
    sink->set_formatter(
        expr::stream << expr::format_date_time<boost::posix_time::ptime>(
                            "TimeStamp", "%Y-%m-%dT%H:%M:%S.%f")
                     << ' ' << severity << ' '
                     << boost::phoenix::bind(&get_native_process_id, process_id.or_none())
                     << ' ' << expr::smessage);
  }
}

template <typename FILE_SINK, typename TAG>
boost::shared_ptr<FILE_SINK> make_sink(LogOptions const& log_opts,
                                       boost::filesystem::path const& full_log_dir,
                                       TAG const tag) {
  auto sink = boost::make_shared<FILE_SINK>(
      keywords::file_name =
          full_log_dir / replace_braces(log_opts.file_name_pattern_, tag),
      keywords::auto_flush = log_opts.auto_flush_,
      keywords::rotation_size = log_opts.rotation_size_);
  if /*constexpr*/ (std::is_same<TAG, Channel>::value) {
    sink->set_filter(channel == static_cast<Channel>(tag));
    set_formatter<Channel>(sink);
  } else {
    // INFO sink logs all other levels. Other sinks only log at their level or higher.
    Severity const min_filter_level = static_cast<Severity>(tag) == Severity::INFO
                                          ? log_opts.severity_
                                          : static_cast<Severity>(tag);
    sink->set_filter(min_filter_level <= severity);
    set_formatter<Severity>(sink);
  }
  typename FILE_SINK::locked_backend_ptr backend = sink->locked_backend();
  if (log_opts.rotate_daily_) {
    backend->set_time_based_rotation(sinks::file::rotation_at_time_point(0, 0, 0));
  }
  backend->set_file_collector(
      sinks::file::make_collector(keywords::target = full_log_dir,
                                  keywords::max_files = log_opts.max_files_,
                                  keywords::min_free_space = log_opts.min_free_space_));
  backend->set_open_handler(create_or_replace_symlink(
      boost::weak_ptr<FILE_SINK>(sink), replace_braces(log_opts.symlink_, tag)));
  backend->scan_for_files();
  return sink;
}

// Pointer to function to optionally call on LOG(FATAL).
std::atomic<FatalFunc> g_fatal_func{nullptr};
std::once_flag g_fatal_func_flag;

using ClogSync = sinks::synchronous_sink<sinks::text_ostream_backend>;
using FileSync = sinks::synchronous_sink<sinks::text_file_backend>;

template <typename CONSOLE_SINK>
boost::shared_ptr<CONSOLE_SINK> make_sink(LogOptions const& log_opts) {
  auto sink = boost::make_shared<CONSOLE_SINK>();
  boost::shared_ptr<std::ostream> clog(&std::clog, boost::null_deleter());
  sink->locked_backend()->add_stream(clog);
  sink->set_filter(log_opts.severity_clog_ <= severity);
  set_formatter<Severity>(sink);
  return sink;
}

// Locking/atomicity not needed for g_any_active_channels or g_min_active_severity
// as they are modifed by init() once.
bool g_any_active_channels{false};
Severity g_min_active_severity{Severity::FATAL};

void init(LogOptions const& log_opts) {
  boost::shared_ptr<boost::log::core> core = boost::log::core::get();
  // boost::log::add_common_attributes(); // LineID TimeStamp ProcessID ThreadID
  core->add_global_attribute("TimeStamp", attr::local_clock());
  core->add_global_attribute("ProcessID", attr::current_process_id());
  if (0 < log_opts.max_files_) {
    boost::filesystem::path const full_log_dir = log_opts.full_log_dir();
    bool const log_dir_was_created = boost::filesystem::create_directory(full_log_dir);
    // Don't create separate log sinks for anything less than Severity::INFO.
    Severity const min_sink_level = std::max(Severity::INFO, log_opts.severity_);
    for (int i = min_sink_level; i < Severity::_NSEVERITIES; ++i) {
      Severity const level = static_cast<Severity>(i);
      core->add_sink(make_sink<FileSync>(log_opts, full_log_dir, level));
    }
    g_min_active_severity = std::min(g_min_active_severity, log_opts.severity_);
    if (log_dir_was_created) {
      LOG(INFO) << "Log directory(" << full_log_dir.native() << ") created.";
    }
    for (auto const channel : log_opts.channels_) {
      core->add_sink(make_sink<FileSync>(log_opts, full_log_dir, channel));
    }
    g_any_active_channels = !log_opts.channels_.empty();
  }
  core->add_sink(make_sink<ClogSync>(log_opts));
  g_min_active_severity = std::min(g_min_active_severity, log_opts.severity_clog_);
}

void set_once_fatal_func(FatalFunc fatal_func) {
  if (g_fatal_func.exchange(fatal_func)) {
    throw std::runtime_error(
        "logger::set_once_fatal_func() should not be called more than once.");
  }
}

void shutdown() {
  boost::log::core::get()->remove_all_sinks();
}

// Used by boost::program_options when parsing enum Channel.
std::istream& operator>>(std::istream& in, Channels& channels) {
  std::string line;
  std::getline(in, line);
  std::regex const rex(R"(\w+)");
  using TokenItr = std::regex_token_iterator<std::string::iterator>;
  TokenItr const end;
  for (TokenItr tok(line.begin(), line.end(), rex); tok != end; ++tok) {
    auto itr = std::find(ChannelNames.cbegin(), ChannelNames.cend(), *tok);
    if (itr == ChannelNames.cend()) {
      in.setstate(std::ios_base::failbit);
      break;
    } else {
      channels.emplace(static_cast<Channel>(itr - ChannelNames.cbegin()));
    }
  }
  return in;
}

// Used by boost::program_options when stringifying Channels.
std::ostream& operator<<(std::ostream& out, Channels const& channels) {
  int i = 0;
  for (auto const channel : channels) {
    out << (i++ ? " " : "") << ChannelNames.at(channel);
  }
  return out;
}

// Used by boost::program_options when parsing enum Severity.
std::istream& operator>>(std::istream& in, Severity& sev) {
  std::string token;
  in >> token;
  auto itr = std::find(SeverityNames.cbegin(), SeverityNames.cend(), token);
  if (itr == SeverityNames.cend()) {
    in.setstate(std::ios_base::failbit);
  } else {
    sev = static_cast<Severity>(itr - SeverityNames.cbegin());
  }
  return in;
}

// Used by boost::program_options when stringifying enum Severity.
std::ostream& operator<<(std::ostream& out, Severity const& sev) {
  return out << SeverityNames.at(sev);
}

Logger::Logger(Channel channel)
    : is_channel_(true)
    , enum_value_(channel)
    , record_(std::make_unique<boost::log::record>(
          gChannelLogger::get().open_record(boost::log::keywords::channel = channel))) {
  if (*record_) {
    stream_ = std::make_unique<boost::log::record_ostream>(*record_);
  }
}

Logger::Logger(Severity severity)
    : is_channel_(false)
    , enum_value_(severity)
    , record_(std::make_unique<boost::log::record>(gSeverityLogger::get().open_record(
          boost::log::keywords::severity = severity))) {
  if (*record_) {
    stream_ = std::make_unique<boost::log::record_ostream>(*record_);
  }
}

Logger::~Logger() {
  if (stream_) {
    if (is_channel_) {
      gChannelLogger::get().push_record(boost::move(stream_->get_record()));
    } else {
      gSeverityLogger::get().push_record(boost::move(stream_->get_record()));
    }
  }
  if (!is_channel_ && static_cast<Severity>(enum_value_) == Severity::FATAL) {
    if (FatalFunc fatal_func = g_fatal_func.load()) {
      // set_once_fatal_func() prevents race condition.
      // Exceptions thrown by (*fatal_func)() are propagated here.
      std::call_once(g_fatal_func_flag, *fatal_func);
    }
    abort();
  }
}

Logger::operator bool() const {
  return static_cast<bool>(stream_);
}

boost::log::record_ostream& Logger::stream(char const* file, int line) {
  return *stream_ << filename(file) << ':' << line << ' ';
}

// DebugTimer-related classes and functions.

using Clock = std::chrono::steady_clock;

class DurationTree;

class Duration {
  DurationTree* const duration_tree_;
  Clock::time_point const start_;
  Clock::time_point stop_;

 public:
  int const depth_;
  Severity const severity_;
  char const* const file_;
  int const line_;
  char const* const name_;

  Duration(DurationTree* duration_tree,
           int depth,
           Severity severity,
           char const* file,
           int line,
           char const* name)
      : duration_tree_(duration_tree)
      , start_(Clock::now())
      , depth_(depth)
      , severity_(severity)
      , file_(file)
      , line_(line)
      , name_(name) {}
  bool stop();
  template <typename Units = std::chrono::milliseconds>
  typename Units::rep value() const {
    return std::chrono::duration_cast<Units>(stop_ - start_).count();
  }
};

using DurationTreeNode = boost::variant<Duration, DurationTree&>;

class DurationTree {
  std::deque<DurationTreeNode> durations_;
  int current_depth_;  //< Depth of next DurationTreeNode.

 public:
  int const depth_;  //< Depth of tree within parent tree, 0 for base tree.
  std::thread::id const thread_id_;
  DurationTree(std::thread::id thread_id, int start_depth)
      // Add +1 to current_depth_ for non-base DurationTrees for extra indentation.
      : current_depth_(start_depth + (start_depth == 0 ? 0 : 1))
      , depth_(start_depth)
      , thread_id_(thread_id) {}
  void pushDurationTree(DurationTree& duration_tree) {
    durations_.emplace_back(duration_tree);
  }
  const Duration& baseDuration() const {
    CHECK(!durations_.empty());
    return boost::get<Duration>(durations_.front());
  }
  int currentDepth() const { return current_depth_; }
  void decrementDepth() { --current_depth_; }
  std::deque<DurationTreeNode> const& durations() const { return durations_; }
  template <typename... Ts>
  Duration* newDuration(Ts&&... args) {
    durations_.emplace_back(Duration(this, current_depth_++, std::forward<Ts>(args)...));
    return boost::get<Duration>(&durations_.back());
  }
};

bool Duration::stop() {
  stop_ = Clock::now();
  duration_tree_->decrementDepth();
  return depth_ == 0;
}

using DurationTreeMap =
    std::unordered_map<std::thread::id, std::unique_ptr<DurationTree>>;

std::mutex gDurationTreeMapMutex;
DurationTreeMap gDurationTreeMap;

template <typename... Ts>
Duration* newDuration(Severity severity, Ts&&... args) {
  if (g_enable_debug_timer) {
    auto const thread_id = std::this_thread::get_id();
    std::lock_guard<std::mutex> lock_guard(gDurationTreeMapMutex);
    auto& duration_tree_ptr = gDurationTreeMap[thread_id];
    if (!duration_tree_ptr) {
      duration_tree_ptr = std::make_unique<DurationTree>(thread_id, 0);
    }
    return duration_tree_ptr->newDuration(severity, std::forward<Ts>(args)...);
  }
  return nullptr;  // Inactive - don't measure or report timing.
}

std::ostream& operator<<(std::ostream& os, Duration const& duration) {
  return os << std::setw(2 * duration.depth_) << ' ' << duration.value() << "ms "
            << duration.name_ << ' ' << filename(duration.file_) << ':' << duration.line_;
}

std::ostream& operator<<(std::ostream& os, DurationTree const& duration_tree) {
  os << std::setw(2 * duration_tree.depth_) << ' ' << "New thread("
     << duration_tree.thread_id_ << ')';
  for (auto const& duration_tree_node : duration_tree.durations()) {
    os << '\n' << duration_tree_node;
  }
  return os << '\n'
            << std::setw(2 * duration_tree.depth_) << ' ' << "End thread("
            << duration_tree.thread_id_ << ')';
}

// Only called by logAndEraseDurationTree() on base tree
boost::log::record_ostream& operator<<(boost::log::record_ostream& os,
                                       DurationTreeMap::const_reference kv_pair) {
  auto itr = kv_pair.second->durations().cbegin();
  auto const end = kv_pair.second->durations().cend();
  auto const& base_duration = boost::get<Duration>(*itr);
  os << "DEBUG_TIMER thread_id(" << kv_pair.first << ")\n"
     << base_duration.value() << "ms total duration for " << base_duration.name_;
  for (++itr; itr != end; ++itr) {
    os << '\n' << *itr;
  }
  return os;
}

// Depth-first search and erase all DurationTrees. Not thread-safe.
struct EraseDurationTrees : boost::static_visitor<> {
  void operator()(DurationTreeMap::const_iterator const& itr) const {
    for (auto const& duration_tree_node : itr->second->durations()) {
      apply_visitor(*this, duration_tree_node);
    }
    gDurationTreeMap.erase(itr);
  }
  void operator()(Duration const&) const {}
  void operator()(DurationTree const& duration_tree) const {
    for (auto const& duration_tree_node : duration_tree.durations()) {
      apply_visitor(*this, duration_tree_node);
    }
    gDurationTreeMap.erase(duration_tree.thread_id_);
  }
};

void logAndEraseDurationTree(std::thread::id const thread_id) {
  std::lock_guard<std::mutex> lock_guard(gDurationTreeMapMutex);
  DurationTreeMap::const_iterator const itr = gDurationTreeMap.find(thread_id);
  CHECK(itr != gDurationTreeMap.cend());
  auto const& base_duration = itr->second->baseDuration();
  if (auto log = Logger(base_duration.severity_)) {
    log.stream(base_duration.file_, base_duration.line_) << *itr;
  }
  EraseDurationTrees const tree_trimmer;
  tree_trimmer(itr);
}

DebugTimer::DebugTimer(Severity severity, char const* file, int line, char const* name)
    : duration_(newDuration(severity, file, line, name)) {}

DebugTimer::~DebugTimer() {
  stop();
}

void DebugTimer::stop() {
  if (duration_) {
    if (duration_->stop()) {
      logAndEraseDurationTree(std::this_thread::get_id());
    }
    duration_ = nullptr;
  }
}

void debugTimerNewThread(std::thread::id parent_thread_id) {
  if (g_enable_debug_timer) {
    auto const thread_id = std::this_thread::get_id();
    if (thread_id != parent_thread_id) {
      std::lock_guard<std::mutex> lock_guard(gDurationTreeMapMutex);
      auto parent_itr = gDurationTreeMap.find(parent_thread_id);
      if (parent_itr != gDurationTreeMap.end()) {
        auto& duration_tree_ptr = gDurationTreeMap[thread_id];
        if (!duration_tree_ptr) {
          auto const current_depth = parent_itr->second->currentDepth();
          duration_tree_ptr =
              std::make_unique<DurationTree>(thread_id, current_depth + 1);
          parent_itr->second->pushDurationTree(*duration_tree_ptr);
        }
      }
    }
  }
}

}  // namespace logger

#endif  // #ifndef __CUDACC__