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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "log_message.h"
#include "exceptions.h"
#include <locale>
#include <sstream>
#include <iostream>
namespace ns_log {
namespace {
std::locale clocale("C");
[[noreturn]] void
bad_tab(const char *tab_name, std::string_view log_line)
{
std::ostringstream os;
os << "Bad " << tab_name << " tab: " << log_line;
throw BadLogLineException(os.str());
}
std::string_view::size_type
find_tab(std::string_view log_line, const char *tab_name, std::string_view::size_type field_pos, bool allowEmpty)
{
auto tab_pos = log_line.find('\t', field_pos);
if (tab_pos == std::string_view::npos || (tab_pos == field_pos && !allowEmpty)) {
bad_tab(tab_name, log_line);
}
return tab_pos;
}
int64_t
parse_time_subfield(std::string time_subfield, const std::string &time_field)
{
std::istringstream subfield_stream(time_subfield);
subfield_stream.imbue(clocale);
int64_t result = 0;
subfield_stream >> result;
if (!subfield_stream.eof()) {
std::ostringstream os;
os << "Bad time field: " << time_field;
throw BadLogLineException(os.str());
}
return result;
}
int64_t
parse_time_field(std::string time_field)
{
auto dotPos = time_field.find('.');
int64_t log_time = parse_time_subfield(time_field.substr(0, dotPos), time_field) * 1000000000;
if (dotPos != std::string::npos) {
log_time += parse_time_subfield((time_field.substr(dotPos + 1) + "000000000").substr(0, 9), time_field);
}
return log_time;
}
struct PidFieldParser
{
int32_t _process_id;
int32_t _thread_id;
PidFieldParser(std::string pid_field);
};
PidFieldParser::PidFieldParser(std::string pid_field)
: _process_id(0),
_thread_id(0)
{
std::istringstream pid_stream(pid_field);
pid_stream.imbue(clocale);
pid_stream >> _process_id;
bool badField = false;
if (!pid_stream.eof() && pid_stream.good() && pid_stream.peek() == '/') {
pid_stream.get();
if (pid_stream.eof()) {
badField = true;
} else {
pid_stream >> _thread_id;
}
}
if (!pid_stream.eof() || pid_stream.fail() || pid_stream.bad() || badField) {
std::ostringstream os;
os << "Bad pid field: " << pid_field;
throw BadLogLineException(os.str());
}
}
}
LogMessage::LogMessage()
: _time_nanos(0),
_hostname(),
_process_id(0),
_thread_id(0),
_service(),
_component(),
_level(Logger::LogLevel::NUM_LOGLEVELS),
_payload()
{
}
LogMessage::LogMessage(int64_t time_nanos_in,
const std::string& hostname_in,
int32_t process_id_in,
int32_t thread_id_in,
const std::string& service_in,
const std::string& component_in,
Logger::LogLevel level_in,
const std::string& payload_in)
: _time_nanos(time_nanos_in),
_hostname(hostname_in),
_process_id(process_id_in),
_thread_id(thread_id_in),
_service(service_in),
_component(component_in),
_level(level_in),
_payload(payload_in)
{
}
LogMessage::LogMessage(LogMessage &&) noexcept = default;
LogMessage & LogMessage::operator=(LogMessage &&) noexcept = default;
LogMessage::~LogMessage() = default;
/*
* Parse log line to populate log message class. The parsing is based on
* LegacyForwarder in logd.
*/
void
LogMessage::parse_log_line(std::string_view log_line)
{
// time
auto tab_pos = find_tab(log_line, "1st", 0, false);
_time_nanos = parse_time_field(std::string(log_line.substr(0, tab_pos)));
// hostname
auto field_pos = tab_pos + 1;
tab_pos = find_tab(log_line, "2nd", field_pos, true);
_hostname = log_line.substr(field_pos, tab_pos - field_pos);
// pid
field_pos = tab_pos + 1;
tab_pos = find_tab(log_line, "3rd", field_pos, false);
PidFieldParser pid_field_parser(std::string(log_line.substr(field_pos, tab_pos - field_pos)));
_process_id = pid_field_parser._process_id;
_thread_id = pid_field_parser._thread_id;
// service
field_pos = tab_pos + 1;
tab_pos = find_tab(log_line, "4th", field_pos, true);
_service = log_line.substr(field_pos, tab_pos - field_pos);
// component
field_pos = tab_pos + 1;
tab_pos = find_tab(log_line, "5th", field_pos, false);
_component = log_line.substr(field_pos, tab_pos -field_pos);
// level
field_pos = tab_pos + 1;
tab_pos = find_tab(log_line, "6th", field_pos, false);
std::string level_string(log_line.substr(field_pos, tab_pos - field_pos));
_level = Logger::parseLevel(level_string.c_str());
_payload = log_line.substr(tab_pos + 1);
}
}
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