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194 lines
6.9 KiB
C++
194 lines
6.9 KiB
C++
/**
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* Copyright (c) 2015, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file time-extension-functions.cc
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*/
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#include "config.h"
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#include <string.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <string>
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#include <unordered_map>
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#include "base/date_time_scanner.hh"
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#include "base/lrucache.hpp"
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#include "sql_util.hh"
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#include "relative_time.hh"
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#include "vtab_module.hh"
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using namespace std;
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static lnav::sqlite::text_buffer timeslice(sqlite3_value *time_in, nonstd::optional<const char *> slice_in_opt)
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{
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thread_local date_time_scanner dts;
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thread_local struct {
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std::string c_slice_str;
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relative_time c_rel_time;
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} cache;
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const auto slice_in = string_fragment(slice_in_opt.value_or("15m"));
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if (slice_in.empty()) {
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throw sqlite_func_error("no time slice value given");
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}
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if (slice_in != cache.c_slice_str.c_str()) {
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auto parse_res = relative_time::from_str(slice_in.data());
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if (parse_res.isErr()) {
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throw sqlite_func_error("unable to parse time slice value: {} -- {}",
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slice_in, parse_res.unwrapErr().pe_msg);
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}
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cache.c_rel_time = parse_res.unwrap();
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if (cache.c_rel_time.empty()) {
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throw sqlite_func_error("could not determine a time slice from: {}",
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slice_in);
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}
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if (cache.c_rel_time.is_absolute()) {
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throw sqlite_func_error("absolute time slices are not valid");
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}
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cache.c_slice_str = slice_in.to_string();
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}
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int64_t us, remainder;
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struct timeval tv;
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switch (sqlite3_value_type(time_in)) {
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case SQLITE3_TEXT: {
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const char *time_in_str = reinterpret_cast<const char *>(sqlite3_value_text(
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time_in));
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struct exttm tm;
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if (dts.scan(time_in_str, strlen(time_in_str), nullptr, &tm, tv, false) == nullptr) {
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dts.unlock();
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if (dts.scan(time_in_str, strlen(time_in_str), nullptr, &tm, tv, false) == nullptr) {
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throw sqlite_func_error("unable to parse time value -- {}",
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time_in_str);
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}
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}
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us = tv.tv_sec * 1000000LL + tv.tv_usec;
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break;
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}
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case SQLITE_INTEGER: {
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auto msecs = sqlite3_value_int64(time_in);
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us = msecs * 1000LL;
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break;
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}
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}
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remainder = us % cache.c_rel_time.to_microseconds();
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us -= remainder;
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tv.tv_sec = us / (1000LL * 1000LL);
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tv.tv_usec = us % (1000LL * 1000LL);
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auto ts = lnav::sqlite::text_buffer::alloc(64);
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ts.tb_length = sql_strftime(ts.tb_value, ts.tb_length, tv);
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return ts;
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}
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static
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nonstd::optional<double> sql_timediff(const char *time1, const char *time2)
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{
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struct timeval tv1, tv2, retval;
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date_time_scanner dts1, dts2;
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auto parse_res1 = relative_time::from_str(time1, -1);
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if (parse_res1.isOk()) {
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tv1 = parse_res1.unwrap().add_now().to_timeval();
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} else if (!dts1.convert_to_timeval(time1, -1, nullptr, tv1)) {
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return nonstd::nullopt;
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}
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auto parse_res2 = relative_time::from_str(time2, -1);
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if (parse_res2.isOk()) {
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tv2 = parse_res2.unwrap().add_now().to_timeval();
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} else if (!dts2.convert_to_timeval(time2, -1, nullptr, tv2)) {
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return nonstd::nullopt;
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}
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timersub(&tv1, &tv2, &retval);
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return (double) retval.tv_sec + (double) retval.tv_usec / 1000000.0;
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}
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int time_extension_functions(struct FuncDef **basic_funcs,
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struct FuncDefAgg **agg_funcs)
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{
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static struct FuncDef time_funcs[] = {
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sqlite_func_adapter<decltype(×lice), timeslice>::builder(
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help_text("timeslice",
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"Return the start of the slice of time that the given timestamp falls in.")
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.sql_function()
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.with_parameter({"time", "The timestamp to get the time slice for."})
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.with_parameter({"slice", "The size of the time slices"})
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.with_tags({"datetime"})
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.with_example({
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"To get the timestamp rounded down to the start of the ten minute slice",
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"SELECT timeslice('2017-01-01T05:05:00', '10m')"
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})
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.with_example({
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"To group log messages into five minute buckets and count them",
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"SELECT timeslice(log_time_msecs, '5m') AS slice, count(*) FROM lnav_example_log GROUP BY slice"
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})
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),
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sqlite_func_adapter<decltype(&sql_timediff), sql_timediff>::builder(
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help_text("timediff",
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"Compute the difference between two timestamps in seconds")
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.sql_function()
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.with_parameter({"time1", "The first timestamp"})
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.with_parameter({"time2", "The timestamp to subtract from the first"})
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.with_tags({"datetime"})
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.with_example({
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"To get the difference between two timestamps",
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"SELECT timediff('2017-02-03T04:05:06', '2017-02-03T04:05:00')"
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})
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.with_example({
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"To get the difference between relative timestamps",
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"SELECT timediff('today', 'yesterday')"
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})
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),
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{ nullptr }
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};
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*basic_funcs = time_funcs;
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*agg_funcs = nullptr;
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return SQLITE_OK;
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}
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