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icinga2/lib/icinga/legacytimeperiod.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "icinga/legacytimeperiod.hpp"
#include "base/function.hpp"
#include "base/convert.hpp"
#include "base/exception.hpp"
#include "base/objectlock.hpp"
#include "base/logger.hpp"
#include "base/debug.hpp"
#include "base/utility.hpp"
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
using namespace icinga;
REGISTER_SCRIPTFUNCTION_NS(Internal, LegacyTimePeriod, &LegacyTimePeriod::ScriptFunc, "tp:begin:end");
bool LegacyTimePeriod::IsInTimeRange(tm *begin, tm *end, int stride, tm *reference)
{
time_t tsbegin, tsend, tsref;
tsbegin = mktime(begin);
tsend = mktime(end);
tsref = mktime(reference);
if (tsref < tsbegin || tsref > tsend)
return false;
int daynumber = (tsref - tsbegin) / (24 * 60 * 60);
if (stride > 1 && daynumber % stride == 0)
return false;
return true;
}
void LegacyTimePeriod::FindNthWeekday(int wday, int n, tm *reference)
{
int dir, seen = 0;
if (n > 0) {
dir = 1;
} else {
n *= -1;
dir = -1;
/* Negative days are relative to the next month. */
reference->tm_mon++;
}
ASSERT(n > 0);
reference->tm_mday = 1;
for (;;) {
mktime(reference);
if (reference->tm_wday == wday) {
seen++;
if (seen == n)
return;
}
reference->tm_mday += dir;
}
}
int LegacyTimePeriod::WeekdayFromString(const String& daydef)
{
if (daydef == "sunday")
return 0;
else if (daydef == "monday")
return 1;
else if (daydef == "tuesday")
return 2;
else if (daydef == "wednesday")
return 3;
else if (daydef == "thursday")
return 4;
else if (daydef == "friday")
return 5;
else if (daydef == "saturday")
return 6;
else
return -1;
}
int LegacyTimePeriod::MonthFromString(const String& monthdef)
{
if (monthdef == "january")
return 0;
else if (monthdef == "february")
return 1;
else if (monthdef == "march")
return 2;
else if (monthdef == "april")
return 3;
else if (monthdef == "may")
return 4;
else if (monthdef == "june")
return 5;
else if (monthdef == "july")
return 6;
else if (monthdef == "august")
return 7;
else if (monthdef == "september")
return 8;
else if (monthdef == "october")
return 9;
else if (monthdef == "november")
return 10;
else if (monthdef == "december")
return 11;
else
return -1;
}
void LegacyTimePeriod::ParseTimeSpec(const String& timespec, tm *begin, tm *end, tm *reference)
{
/* Let mktime() figure out whether we're in DST or not. */
reference->tm_isdst = -1;
/* YYYY-MM-DD */
if (timespec.GetLength() == 10 && timespec[4] == '-' && timespec[7] == '-') {
int year = Convert::ToLong(timespec.SubStr(0, 4));
int month = Convert::ToLong(timespec.SubStr(5, 2));
int day = Convert::ToLong(timespec.SubStr(8, 2));
if (month < 1 || month > 12)
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid month in time specification: " + timespec));
if (day < 1 || day > 31)
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid day in time specification: " + timespec));
if (begin) {
*begin = *reference;
begin->tm_year = year - 1900;
begin->tm_mon = month - 1;
begin->tm_mday = day;
begin->tm_hour = 0;
begin->tm_min = 0;
begin->tm_sec = 0;
}
if (end) {
*end = *reference;
end->tm_year = year - 1900;
end->tm_mon = month - 1;
end->tm_mday = day;
end->tm_hour = 24;
end->tm_min = 0;
end->tm_sec = 0;
}
return;
}
std::vector<String> tokens;
boost::algorithm::split(tokens, timespec, boost::is_any_of(" "));
int mon = -1;
if (tokens.size() > 1 && (tokens[0] == "day" || (mon = MonthFromString(tokens[0])) != -1)) {
if (mon == -1)
mon = reference->tm_mon;
int mday = Convert::ToLong(tokens[1]);
if (begin) {
*begin = *reference;
begin->tm_mon = mon;
begin->tm_mday = mday;
begin->tm_hour = 0;
begin->tm_min = 0;
begin->tm_sec = 0;
/* Negative days are relative to the next month. */
if (mday < 0) {
begin->tm_mday = mday * -1 - 1;
begin->tm_mon++;
}
}
if (end) {
*end = *reference;
end->tm_mon = mon;
end->tm_mday = mday;
end->tm_hour = 24;
end->tm_min = 0;
end->tm_sec = 0;
/* Negative days are relative to the next month. */
if (mday < 0) {
end->tm_mday = mday * -1 - 1;
end->tm_mon++;
}
}
return;
}
int wday;
if (tokens.size() >= 1 && (wday = WeekdayFromString(tokens[0])) != -1) {
tm myref = *reference;
if (tokens.size() > 2) {
mon = MonthFromString(tokens[2]);
if (mon == -1)
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid month in time specification: " + timespec));
myref.tm_mon = mon;
}
int n = 0;
if (tokens.size() > 1)
n = Convert::ToLong(tokens[1]);
if (begin) {
*begin = myref;
if (tokens.size() > 1)
FindNthWeekday(wday, n, begin);
else
begin->tm_mday += (7 - begin->tm_wday + wday) % 7;
begin->tm_hour = 0;
begin->tm_min = 0;
begin->tm_sec = 0;
}
if (end) {
*end = myref;
if (tokens.size() > 1)
FindNthWeekday(wday, n, end);
else
end->tm_mday += (7 - end->tm_wday + wday) % 7;
end->tm_hour = 0;
end->tm_min = 0;
end->tm_sec = 0;
end->tm_mday++;
}
return;
}
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid time specification: " + timespec));
}
void LegacyTimePeriod::ParseTimeRange(const String& timerange, tm *begin, tm *end, int *stride, tm *reference)
{
String def = timerange;
/* Figure out the stride. */
size_t pos = def.FindFirstOf('/');
if (pos != String::NPos) {
String strStride = def.SubStr(pos + 1).Trim();
*stride = Convert::ToLong(strStride);
/* Remove the stride parameter from the definition. */
def = def.SubStr(0, pos);
} else {
*stride = 1; /* User didn't specify anything, assume default. */
}
/* Figure out whether the user has specified two dates. */
pos = def.Find("- ");
if (pos != String::NPos) {
String first = def.SubStr(0, pos).Trim();
String second = def.SubStr(pos + 1).Trim();
ParseTimeSpec(first, begin, NULL, reference);
/* If the second definition starts with a number we need
* to add the first word from the first definition, e.g.:
* day 1 - 15 --> "day 15" */
bool is_number = true;
size_t xpos = second.FindFirstOf(' ');
String fword = second.SubStr(0, xpos);
try {
Convert::ToLong(fword);
} catch (...) {
is_number = false;
}
if (is_number) {
xpos = first.FindFirstOf(' ');
ASSERT(xpos != String::NPos);
second = first.SubStr(0, xpos + 1) + second;
}
ParseTimeSpec(second, NULL, end, reference);
} else {
ParseTimeSpec(def, begin, end, reference);
}
}
bool LegacyTimePeriod::IsInDayDefinition(const String& daydef, tm *reference)
{
tm begin, end;
int stride;
ParseTimeRange(daydef, &begin, &end, &stride, reference);
Log(LogDebug, "LegacyTimePeriod")
<< "ParseTimeRange: '" << daydef << "' => " << mktime(&begin)
<< " -> " << mktime(&end) << ", stride: " << stride;
return IsInTimeRange(&begin, &end, stride, reference);
}
void LegacyTimePeriod::ProcessTimeRangeRaw(const String& timerange, tm *reference, tm *begin, tm *end)
{
std::vector<String> times;
boost::algorithm::split(times, timerange, boost::is_any_of("-"));
if (times.size() != 2)
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid timerange: " + timerange));
std::vector<String> hd1, hd2;
boost::algorithm::split(hd1, times[0], boost::is_any_of(":"));
if (hd1.size() != 2)
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid time specification: " + times[0]));
boost::algorithm::split(hd2, times[1], boost::is_any_of(":"));
if (hd2.size() != 2)
BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid time specification: " + times[1]));
*begin = *reference;
begin->tm_sec = 0;
begin->tm_min = Convert::ToLong(hd1[1]);
begin->tm_hour = Convert::ToLong(hd1[0]);
*end = *reference;
end->tm_sec = 0;
end->tm_min = Convert::ToLong(hd2[1]);
end->tm_hour = Convert::ToLong(hd2[0]);
if (begin->tm_hour * 3600 + begin->tm_min * 60 + begin->tm_sec >=
end->tm_hour * 3600 + end->tm_min * 60 + end->tm_sec)
BOOST_THROW_EXCEPTION(std::invalid_argument("Time period segment ends before it begins"));
}
Dictionary::Ptr LegacyTimePeriod::ProcessTimeRange(const String& timestamp, tm *reference)
{
tm begin, end;
ProcessTimeRangeRaw(timestamp, reference, &begin, &end);
Dictionary::Ptr segment = new Dictionary();
segment->Set("begin", (long)mktime(&begin));
segment->Set("end", (long)mktime(&end));
return segment;
}
void LegacyTimePeriod::ProcessTimeRanges(const String& timeranges, tm *reference, const Array::Ptr& result)
{
std::vector<String> ranges;
boost::algorithm::split(ranges, timeranges, boost::is_any_of(","));
for (const String& range : ranges) {
Dictionary::Ptr segment = ProcessTimeRange(range, reference);
if (segment->Get("begin") >= segment->Get("end"))
continue;
result->Add(segment);
}
}
Dictionary::Ptr LegacyTimePeriod::FindNextSegment(const String& daydef, const String& timeranges, tm *reference)
{
tm begin, end, iter, ref;
time_t tsend, tsiter, tsref;
int stride;
for (int pass = 1; pass <= 2; pass++) {
if (pass == 1) {
ref = *reference;
} else {
ref = end;
ref.tm_mday++;
}
tsref = mktime(&ref);
ParseTimeRange(daydef, &begin, &end, &stride, &ref);
iter = begin;
tsend = mktime(&end);
do {
if (IsInTimeRange(&begin, &end, stride, &iter)) {
Array::Ptr segments = new Array();
ProcessTimeRanges(timeranges, &iter, segments);
Dictionary::Ptr bestSegment;
double bestBegin;
ObjectLock olock(segments);
for (const Dictionary::Ptr& segment : segments) {
double begin = segment->Get("begin");
if (begin < tsref)
continue;
if (!bestSegment || begin < bestBegin) {
bestSegment = segment;
bestBegin = begin;
}
}
if (bestSegment)
return bestSegment;
}
iter.tm_mday++;
iter.tm_hour = 0;
iter.tm_min = 0;
iter.tm_sec = 0;
tsiter = mktime(&iter);
} while (tsiter < tsend);
}
return Dictionary::Ptr();
}
Array::Ptr LegacyTimePeriod::ScriptFunc(const TimePeriod::Ptr& tp, double begin, double end)
{
Array::Ptr segments = new Array();
Dictionary::Ptr ranges = tp->GetRanges();
if (ranges) {
for (int i = 0; i <= (end - begin) / (24 * 60 * 60); i++) {
time_t refts = begin + i * 24 * 60 * 60;
tm reference = Utility::LocalTime(refts);
#ifdef I2_DEBUG
Log(LogDebug, "LegacyTimePeriod")
<< "Checking reference time " << refts;
#endif /* I2_DEBUG */
ObjectLock olock(ranges);
for (const Dictionary::Pair& kv : ranges) {
if (!IsInDayDefinition(kv.first, &reference)) {
#ifdef I2_DEBUG
Log(LogDebug, "LegacyTimePeriod")
<< "Not in day definition '" << kv.first << "'.";
#endif /* I2_DEBUG */
continue;
}
#ifdef I2_DEBUG
Log(LogDebug, "LegacyTimePeriod")
<< "In day definition '" << kv.first << "'.";
#endif /* I2_DEBUG */
ProcessTimeRanges(kv.second, &reference, segments);
}
}
}
Log(LogDebug, "LegacyTimePeriod")
<< "Legacy timeperiod update returned " << segments->GetLength() << " segments.";
return segments;
}
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