tyler/proxmox-backup
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

src/tools/systemd/parse_time.rs: move parser into separate file

Browse Source
This commit is contained in:
Dietmar Maurer
2020-05-16 06:53:15 +02:00
parent 2ee6b3fdb9
commit e05b637c73
3 changed files with 336 additions and 328 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/tools/systemd.rs
View File

@ -1,3 +1,5 @@
pub mod time;
pub mod types;
pub mod config;
mod parse_time;
pub mod time;

332
src/tools/systemd/parse_time.rs Normal file
View File

@ -0,0 +1,332 @@
use std::collections::HashMap;
use anyhow::{bail, Error};
use lazy_static::lazy_static;
use super::time::*;
use nom::{
error::{context, ParseError, VerboseError},
bytes::complete::{tag, take_while1},
combinator::{map_res, all_consuming, opt, recognize},
sequence::{pair, preceded, tuple},
character::complete::{alpha1, space0, digit1},
multi::separated_nonempty_list,
};
type IResult<I, O, E = VerboseError<I>> = Result<(I, O), nom::Err<E>>;
fn parse_error<'a>(i: &'a str, context: &'static str) -> nom::Err<VerboseError<&'a str>> {
let err = VerboseError { errors: Vec::new() };
let err =VerboseError::add_context(i, context, err);
nom::Err::Error(err)
}
lazy_static! {
pub static ref TIME_SPAN_UNITS: HashMap<&'static str, f64> = {
let mut map = HashMap::new();
let second = 1.0;
map.insert("seconds", second);
map.insert("second", second);
map.insert("sec", second);
map.insert("s", second);
let msec = second / 1000.0;
map.insert("msec", msec);
map.insert("ms", msec);
let usec = msec / 1000.0;
map.insert("usec", usec);
map.insert("us", usec);
map.insert("µs", usec);
let nsec = usec / 1000.0;
map.insert("nsec", nsec);
map.insert("ns", nsec);
let minute = second * 60.0;
map.insert("minutes", minute);
map.insert("minute", minute);
map.insert("min", minute);
map.insert("m", minute);
let hour = minute * 60.0;
map.insert("hours", hour);
map.insert("hour", hour);
map.insert("hr", hour);
map.insert("h", hour);
let day = hour * 24.0 ;
map.insert("days", day);
map.insert("day", day);
map.insert("d", day);
let week = day * 7.0;
map.insert("weeks", week);
map.insert("week", week);
map.insert("w", week);
let month = 30.44 * day;
map.insert("months", month);
map.insert("month", month);
map.insert("M", month);
let year = 365.25 * day;
map.insert("years", year);
map.insert("year", year);
map.insert("y", year);
map
};
}
fn parse_u32(i: &str) -> IResult<&str, u32> {
map_res(recognize(digit1), str::parse)(i)
}
fn parse_u64(i: &str) -> IResult<&str, u64> {
map_res(recognize(digit1), str::parse)(i)
}
fn parse_weekday(i: &str) -> IResult<&str, WeekDays, VerboseError<&str>> {
let (i, text) = alpha1(i)?;
match text.to_ascii_lowercase().as_str() {
"monday" | "mon" => Ok((i, WeekDays::MONDAY)),
"tuesday" | "tue" => Ok((i, WeekDays::TUESDAY)),
"wednesday" | "wed" => Ok((i, WeekDays::WEDNESDAY)),
"thursday" | "thu" => Ok((i, WeekDays::THURSDAY)),
"friday" | "fri" => Ok((i, WeekDays::FRIDAY)),
"saturday" | "sat" => Ok((i, WeekDays::SATURDAY)),
"sunday" | "sun" => Ok((i, WeekDays::SUNDAY)),
_ => return Err(parse_error(text, "weekday")),
}
}
fn parse_weekdays_range(i: &str) -> IResult<&str, WeekDays> {
let (i, startday) = parse_weekday(i)?;
let generate_range = |start, end| {
let mut res = 0;
let mut pos = start;
loop {
res |= pos;
if pos >= end { break; }
pos = pos << 1;
}
WeekDays::from_bits(res).unwrap()
};
if let (i, Some((_, endday))) = opt(pair(tag(".."),parse_weekday))(i)? {
let start = startday.bits();
let end = endday.bits();
if start > end {
let set1 = generate_range(start, WeekDays::SUNDAY.bits());
let set2 = generate_range(WeekDays::MONDAY.bits(), end);
Ok((i, set1 | set2))
} else {
Ok((i, generate_range(start, end)))
}
} else {
Ok((i, startday))
}
}
fn parse_date_time_comp(i: &str) -> IResult<&str, DateTimeValue> {
let (i, value) = parse_u32(i)?;
if let (i, Some(end)) = opt(preceded(tag(".."), parse_u32))(i)? {
return Ok((i, DateTimeValue::Range(value, end)))
}
if i.starts_with("/") {
let i = &i[1..];
let (i, repeat) = parse_u32(i)?;
Ok((i, DateTimeValue::Repeated(value, repeat)))
} else {
Ok((i, DateTimeValue::Single(value)))
}
}
fn parse_date_time_comp_list(i: &str) -> IResult<&str, Vec<DateTimeValue>> {
if i.starts_with("*") {
return Ok((&i[1..], Vec::new()));
}
separated_nonempty_list(tag(","), parse_date_time_comp)(i)
}
fn parse_time_spec(i: &str) -> IResult<&str, (Vec<DateTimeValue>, Vec<DateTimeValue>, Vec<DateTimeValue>)> {
let (i, (hour, minute, opt_second)) = tuple((
parse_date_time_comp_list,
preceded(tag(":"), parse_date_time_comp_list),
opt(preceded(tag(":"), parse_date_time_comp_list)),
))(i)?;
if let Some(second) = opt_second {
Ok((i, (hour, minute, second)))
} else {
Ok((i, (hour, minute, vec![DateTimeValue::Single(0)])))
}
}
pub fn parse_calendar_event(i: &str) -> Result<CalendarEvent, Error> {
match all_consuming(parse_calendar_event_incomplete)(i) {
Err(err) => bail!("unable to parse calendar event: {}", err),
Ok((_, ce)) => Ok(ce),
}
}
fn parse_calendar_event_incomplete(mut i: &str) -> IResult<&str, CalendarEvent> {
let mut has_dayspec = false;
let mut has_timespec = false;
let has_datespec = false;
let mut event = CalendarEvent::default();
if i.starts_with(|c: char| char::is_ascii_alphabetic(&c)) {
match i {
"minutely" => {
return Ok(("", CalendarEvent {
second: vec![DateTimeValue::Single(0)],
..Default::default()
}));
}
"hourly" => {
return Ok(("", CalendarEvent {
minute: vec![DateTimeValue::Single(0)],
second: vec![DateTimeValue::Single(0)],
..Default::default()
}));
}
"daily" => {
return Ok(("", CalendarEvent {
hour: vec![DateTimeValue::Single(0)],
minute: vec![DateTimeValue::Single(0)],
second: vec![DateTimeValue::Single(0)],
..Default::default()
}));
}
"monthly" | "weekly" | "yearly" | "quarterly" | "semiannually" => {
unimplemented!();
}
_ => { /* continue */ }
}
let (n, range_list) = context(
"weekday range list",
separated_nonempty_list(tag(","), parse_weekdays_range)
)(i)?;
has_dayspec = true;
i = space0(n)?.0;
for range in range_list { event.days.insert(range); }
}
// todo: support date specs
if let (n, Some((hour, minute, second))) = opt(parse_time_spec)(i)? {
event.hour = hour;
event.minute = minute;
event.second = second;
has_timespec = true;
i = n;
} else {
event.hour = vec![DateTimeValue::Single(0)];
event.minute = vec![DateTimeValue::Single(0)];
event.second = vec![DateTimeValue::Single(0)];
}
if !(has_dayspec || has_timespec || has_datespec) {
return Err(parse_error(i, "date or time specification"));
}
Ok((i, event))
}
fn parse_time_unit(i: &str) -> IResult<&str, &str> {
let (n, text) = take_while1(|c: char| char::is_ascii_alphabetic(&c) || c == 'µ')(i)?;
if TIME_SPAN_UNITS.contains_key(&text) {
Ok((n, text))
} else {
Err(parse_error(text, "time unit"))
}
}
pub fn parse_time_span(i: &str) -> Result<TimeSpan, Error> {
match all_consuming(parse_time_span_incomplete)(i) {
Err(err) => bail!("unable to parse time span: {}", err),
Ok((_, ts)) => Ok(ts),
}
}
fn parse_time_span_incomplete(mut i: &str) -> IResult<&str, TimeSpan> {
let mut ts = TimeSpan::default();
loop {
i = space0(i)?.0;
if i.is_empty() { break; }
let (n, num) = parse_u64(i)?;
i = space0(n)?.0;
if let (n, Some(unit)) = opt(parse_time_unit)(i)? {
i = n;
match unit {
"seconds" | "second" | "sec" | "s" => {
ts.seconds += num;
}
"msec" | "ms" => {
ts.msec += num;
}
"usec" | "us" | "µs" => {
ts.usec += num;
}
"nsec" | "ns" => {
ts.nsec += num;
}
"minutes" | "minute" | "min" | "m" => {
ts.minutes += num;
}
"hours" | "hour" | "hr" | "h" => {
ts.hours += num;
}
"days" | "day" | "d" => {
ts.days += num;
}
"weeks" | "week" | "w" => {
ts.weeks += num;
}
"months" | "month" | "M" => {
ts.months += num;
}
"years" | "year" | "y" => {
ts.years += num;
}
_ => return Err(parse_error(unit, "internal error")),
}
} else {
ts.seconds += num;
}
}
Ok((i, ts))
}

328
src/tools/systemd/time.rs
View File

@ -1,27 +1,9 @@
use std::collections::HashMap;
use anyhow::{bail, Error};
use lazy_static::lazy_static;
use bitflags::bitflags;
use proxmox::tools::time::*;
use nom::{
error::{context, ParseError, VerboseError},
bytes::complete::{tag, take_while1},
combinator::{map_res, all_consuming, opt, recognize},
sequence::{pair, preceded, tuple},
character::complete::{alpha1, space0, digit1},
multi::separated_nonempty_list,
};
type IResult<I, O, E = VerboseError<I>> = Result<(I, O), nom::Err<E>>;
fn parse_error<'a>(i: &'a str, context: &'static str) -> nom::Err<VerboseError<&'a str>> {
let err = VerboseError { errors: Vec::new() };
let err =VerboseError::add_context(i, context, err);
nom::Err::Error(err)
}
use super::parse_time::*;
bitflags!{
#[derive(Default)]
@ -118,74 +100,6 @@ pub struct CalendarEvent {
pub hour: Vec<DateTimeValue>,
}
lazy_static! {
pub static ref TIME_SPAN_UNITS: HashMap<&'static str, f64> = {
let mut map = HashMap::new();
let second = 1.0;
map.insert("seconds", second);
map.insert("second", second);
map.insert("sec", second);
map.insert("s", second);
let msec = second / 1000.0;
map.insert("msec", msec);
map.insert("ms", msec);
let usec = msec / 1000.0;
map.insert("usec", usec);
map.insert("us", usec);
map.insert("µs", usec);
let nsec = usec / 1000.0;
map.insert("nsec", nsec);
map.insert("ns", nsec);
let minute = second * 60.0;
map.insert("minutes", minute);
map.insert("minute", minute);
map.insert("min", minute);
map.insert("m", minute);
let hour = minute * 60.0;
map.insert("hours", hour);
map.insert("hour", hour);
map.insert("hr", hour);
map.insert("h", hour);
let day = hour * 24.0 ;
map.insert("days", day);
map.insert("day", day);
map.insert("d", day);
let week = day * 7.0;
map.insert("weeks", week);
map.insert("week", week);
map.insert("w", week);
let month = 30.44 * day;
map.insert("months", month);
map.insert("month", month);
map.insert("M", month);
let year = 365.25 * day;
map.insert("years", year);
map.insert("year", year);
map.insert("y", year);
map
};
}
#[derive(Default)]
pub struct TimeSpan {
@ -223,246 +137,6 @@ impl From<TimeSpan> for f64 {
}
}
fn parse_u32(i: &str) -> IResult<&str, u32> {
map_res(recognize(digit1), str::parse)(i)
}
fn parse_u64(i: &str) -> IResult<&str, u64> {
map_res(recognize(digit1), str::parse)(i)
}
fn parse_weekday(i: &str) -> IResult<&str, WeekDays, VerboseError<&str>> {
let (i, text) = alpha1(i)?;
match text.to_ascii_lowercase().as_str() {
"monday" | "mon" => Ok((i, WeekDays::MONDAY)),
"tuesday" | "tue" => Ok((i, WeekDays::TUESDAY)),
"wednesday" | "wed" => Ok((i, WeekDays::WEDNESDAY)),
"thursday" | "thu" => Ok((i, WeekDays::THURSDAY)),
"friday" | "fri" => Ok((i, WeekDays::FRIDAY)),
"saturday" | "sat" => Ok((i, WeekDays::SATURDAY)),
"sunday" | "sun" => Ok((i, WeekDays::SUNDAY)),
_ => return Err(parse_error(text, "weekday")),
}
}
fn parse_weekdays_range(i: &str) -> IResult<&str, WeekDays> {
let (i, startday) = parse_weekday(i)?;
let generate_range = |start, end| {
let mut res = 0;
let mut pos = start;
loop {
res |= pos;
if pos >= end { break; }
pos = pos << 1;
}
WeekDays::from_bits(res).unwrap()
};
if let (i, Some((_, endday))) = opt(pair(tag(".."),parse_weekday))(i)? {
let start = startday.bits();
let end = endday.bits();
if start > end {
let set1 = generate_range(start, WeekDays::SUNDAY.bits());
let set2 = generate_range(WeekDays::MONDAY.bits(), end);
Ok((i, set1 | set2))
} else {
Ok((i, generate_range(start, end)))
}
} else {
Ok((i, startday))
}
}
fn parse_date_time_comp(i: &str) -> IResult<&str, DateTimeValue> {
let (i, value) = parse_u32(i)?;
if let (i, Some(end)) = opt(preceded(tag(".."), parse_u32))(i)? {
return Ok((i, DateTimeValue::Range(value, end)))
}
if i.starts_with("/") {
let i = &i[1..];
let (i, repeat) = parse_u32(i)?;
Ok((i, DateTimeValue::Repeated(value, repeat)))
} else {
Ok((i, DateTimeValue::Single(value)))
}
}
fn parse_date_time_comp_list(i: &str) -> IResult<&str, Vec<DateTimeValue>> {
if i.starts_with("*") {
return Ok((&i[1..], Vec::new()));
}
separated_nonempty_list(tag(","), parse_date_time_comp)(i)
}
fn parse_time_spec(i: &str) -> IResult<&str, (Vec<DateTimeValue>, Vec<DateTimeValue>, Vec<DateTimeValue>)> {
let (i, (hour, minute, opt_second)) = tuple((
parse_date_time_comp_list,
preceded(tag(":"), parse_date_time_comp_list),
opt(preceded(tag(":"), parse_date_time_comp_list)),
))(i)?;
if let Some(second) = opt_second {
Ok((i, (hour, minute, second)))
} else {
Ok((i, (hour, minute, vec![DateTimeValue::Single(0)])))
}
}
pub fn parse_calendar_event(i: &str) -> Result<CalendarEvent, Error> {
match all_consuming(parse_calendar_event_incomplete)(i) {
Err(err) => bail!("unable to parse calendar event: {}", err),
Ok((_, ce)) => Ok(ce),
}
}
fn parse_calendar_event_incomplete(mut i: &str) -> IResult<&str, CalendarEvent> {
let mut has_dayspec = false;
let mut has_timespec = false;
let has_datespec = false;
let mut event = CalendarEvent::default();
if i.starts_with(|c: char| char::is_ascii_alphabetic(&c)) {
match i {
"minutely" => {
return Ok(("", CalendarEvent {
second: vec![DateTimeValue::Single(0)],
..Default::default()
}));
}
"hourly" => {
return Ok(("", CalendarEvent {
minute: vec![DateTimeValue::Single(0)],
second: vec![DateTimeValue::Single(0)],
..Default::default()
}));
}
"daily" => {
return Ok(("", CalendarEvent {
hour: vec![DateTimeValue::Single(0)],
minute: vec![DateTimeValue::Single(0)],
second: vec![DateTimeValue::Single(0)],
..Default::default()
}));
}
"monthly" | "weekly" | "yearly" | "quarterly" | "semiannually" => {
unimplemented!();
}
_ => { /* continue */ }
}
let (n, range_list) = context(
"weekday range list",
separated_nonempty_list(tag(","), parse_weekdays_range)
)(i)?;
has_dayspec = true;
i = space0(n)?.0;
for range in range_list { event.days.insert(range); }
}
// todo: support date specs
if let (n, Some((hour, minute, second))) = opt(parse_time_spec)(i)? {
event.hour = hour;
event.minute = minute;
event.second = second;
has_timespec = true;
i = n;
} else {
event.hour = vec![DateTimeValue::Single(0)];
event.minute = vec![DateTimeValue::Single(0)];
event.second = vec![DateTimeValue::Single(0)];
}
if !(has_dayspec || has_timespec || has_datespec) {
return Err(parse_error(i, "date or time specification"));
}
Ok((i, event))
}
fn parse_time_unit(i: &str) -> IResult<&str, &str> {
let (n, text) = take_while1(|c: char| char::is_ascii_alphabetic(&c) || c == 'µ')(i)?;
if TIME_SPAN_UNITS.contains_key(&text) {
Ok((n, text))
} else {
Err(parse_error(text, "time unit"))
}
}
pub fn parse_time_span(i: &str) -> Result<TimeSpan, Error> {
match all_consuming(parse_time_span_incomplete)(i) {
Err(err) => bail!("unable to parse time span: {}", err),
Ok((_, ts)) => Ok(ts),
}
}
fn parse_time_span_incomplete(mut i: &str) -> IResult<&str, TimeSpan> {
let mut ts = TimeSpan::default();
loop {
i = space0(i)?.0;
if i.is_empty() { break; }
let (n, num) = parse_u64(i)?;
i = space0(n)?.0;
if let (n, Some(unit)) = opt(parse_time_unit)(i)? {
i = n;
match unit {
"seconds" | "second" | "sec" | "s" => {
ts.seconds += num;
}
"msec" | "ms" => {
ts.msec += num;
}
"usec" | "us" | "µs" => {
ts.usec += num;
}
"nsec" | "ns" => {
ts.nsec += num;
}
"minutes" | "minute" | "min" | "m" => {
ts.minutes += num;
}
"hours" | "hour" | "hr" | "h" => {
ts.hours += num;
}
"days" | "day" | "d" => {
ts.days += num;
}
"weeks" | "week" | "w" => {
ts.weeks += num;
}
"months" | "month" | "M" => {
ts.months += num;
}
"years" | "year" | "y" => {
ts.years += num;
}
_ => return Err(parse_error(unit, "internal error")),
}
} else {
ts.seconds += num;
}
}
Ok((i, ts))
}
pub fn verify_time_span<'a>(i: &'a str) -> Result<(), Error> {
parse_time_span(i)?;