mirror of https://github.com/tstack/lnav
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
155 lines
4.9 KiB
C++
155 lines
4.9 KiB
C++
/**
|
|
* 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 "date/tz.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{};
|
|
}
|
|
|
|
struct lock_state {
|
|
int ls_fmt_index{-1};
|
|
int ls_fmt_len{-1};
|
|
};
|
|
|
|
/**
|
|
* Unlock this scanner so that the format is rediscovered.
|
|
*/
|
|
lock_state unlock()
|
|
{
|
|
auto retval = lock_state{this->dts_fmt_lock, this->dts_fmt_len};
|
|
|
|
this->dts_fmt_lock = -1;
|
|
this->dts_fmt_len = -1;
|
|
return retval;
|
|
}
|
|
|
|
void relock(const lock_state& ls)
|
|
{
|
|
this->dts_fmt_lock = ls.ls_fmt_index;
|
|
this->dts_fmt_len = ls.ls_fmt_len;
|
|
}
|
|
|
|
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};
|
|
bool dts_zoned_to_local{true};
|
|
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};
|
|
const date::time_zone* dts_default_zone{nullptr};
|
|
|
|
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
|