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/**
* Copyright (c) 2020, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Timothy Stack 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 REGENTS 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 REGENTS 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.
*
* @file date_time_scanner.hh
*/
#ifndef lnav_date_time_scanner_hh
#define lnav_date_time_scanner_hh
#include <ctime>
#include <string>
#include <sys/types.h>
#include "time_util.hh"
/**
* Scans a timestamp string to discover the date-time format using the custom
* ptimec parser. Once a format is found, it is locked in so that the next
* time a timestamp needs to be scanned, the format does not have to be
* rediscovered. The discovered date-time format can also be used to convert
* an exttm struct to a string using the ftime() method.
*/
struct date_time_scanner {
date_time_scanner() { this->clear(); }
void clear()
{
this->dts_base_time = 0;
this->dts_base_tm = exttm{};
this->dts_fmt_lock = -1;
this->dts_fmt_len = -1;
this->dts_last_tv = timeval{};
this->dts_last_tm = exttm{};
}
/**
* Unlock this scanner so that the format is rediscovered.
*/
void unlock()
{
this->dts_fmt_lock = -1;
this->dts_fmt_len = -1;
}
void set_base_time(time_t base_time, const tm& local_tm);
/**
* Convert a timestamp to local time.
*
* Calling localtime_r is slow since it wants to lookup the timezone on
* every call, so we cache the result and only call it again if the
* requested time falls outside of a fifteen minute range.
*/
void to_localtime(time_t t, struct exttm& tm_out);
bool dts_keep_base_tz{false};
bool dts_local_time{false};
time_t dts_base_time{0};
struct exttm dts_base_tm;
int dts_fmt_lock{-1};
int dts_fmt_len{-1};
struct exttm dts_last_tm {};
struct timeval dts_last_tv {};
time_t dts_local_offset_cache{0};
time_t dts_local_offset_valid{0};
time_t dts_local_offset_expiry{0};
static const int EXPIRE_TIME = 15 * 60;
const char* scan(const char* time_src,
size_t time_len,
const char* const time_fmt[],
struct exttm* tm_out,
struct timeval& tv_out,
bool convert_local = true);
size_t ftime(char* dst,
size_t len,
const char* const time_fmt[],
const struct exttm& tm) const;
bool convert_to_timeval(const char* time_src,
ssize_t time_len,
const char* const time_fmt[],
struct timeval& tv_out)
{
struct exttm tm;
if (time_len == -1) {
time_len = strlen(time_src);
}
if (this->scan(time_src, time_len, time_fmt, &tm, tv_out) != nullptr) {
return true;
}
return false;
}
bool convert_to_timeval(const std::string& time_src, struct timeval& tv_out)
{
struct exttm tm;
if (this->scan(time_src.c_str(), time_src.size(), nullptr, &tm, tv_out)
!= nullptr)
{
return true;
}
return false;
}
};
#endif
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