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add support for nanocpus (fixes issue #18) #19

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Aug 27, 2024
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add support for nanocpus (fixes issue #18) #19

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50 changes: 50 additions & 0 deletions src/parser.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,8 @@ fn parse_suffix(input: &str) -> IResult<&str, (Format, Scale)> {
tag("Ti"),
tag("Pi"),
tag("Ei"),
tag("n"),
tag("u"),
tag("m"),
tag("k"),
tag("M"),
Expand All @@ -114,6 +116,8 @@ fn parse_suffix(input: &str) -> IResult<&str, (Format, Scale)> {
"Pi" => (Format::BinarySI, Scale::Peta),
"Ei" => (Format::BinarySI, Scale::Exa),
//
"n" => (Format::DecimalSI, Scale::Nano),
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"u" => (Format::DecimalSI, Scale::Micro),
"m" => (Format::DecimalSI, Scale::Milli),
"" => (Format::DecimalSI, Scale::One),
"k" => (Format::DecimalSI, Scale::Kilo),
Expand Down Expand Up @@ -202,6 +206,32 @@ mod tests {
assert_eq!(quantity.to_string(), "0".to_owned());
}

#[test]
fn test_nano_quantity() {
let quantity = parse_quantity_string("100000000n");
assert!(quantity.is_ok());

let quantity = quantity.unwrap().1;
assert_eq!(quantity.value, Decimal::new(100000000, 0));
assert_eq!(quantity.scale, Scale::Nano);
assert_eq!(quantity.format, Format::DecimalSI);

assert_eq!(quantity.to_string(), "100000000n");
}

#[test]
fn test_micro_quantity() {
let quantity = parse_quantity_string("100000u");
assert!(quantity.is_ok());

let quantity = quantity.unwrap().1;
assert_eq!(quantity.value, Decimal::new(100000, 0));
assert_eq!(quantity.scale, Scale::Micro);
assert_eq!(quantity.format, Format::DecimalSI);

assert_eq!(quantity.to_string(), "100000u");
}

#[test]
fn test_milli_quantity() {
let quantity = parse_quantity_string("100m");
Expand Down Expand Up @@ -245,6 +275,26 @@ mod tests {
assert_eq!(q3.to_string(), "2049Ki");
}

#[test]
fn test_quantity_addition_binary_si_mixed_scales_2() {
let q1 = parse_quantity_string("50m").unwrap().1;
let q2 = parse_quantity_string("50000000n").unwrap().1;

let q3 = q1 + q2;

assert_eq!(q3.to_string(), "100000000n");
}

#[test]
fn test_quantity_addition_binary_si_mixed_scales_3() {
let q1 = parse_quantity_string("1.5u").unwrap().1;
let q2 = parse_quantity_string("500n").unwrap().1;

let q3 = q1 + q2;

assert_eq!(q3.to_string(), "2000n");
}

#[test]
fn test_quantity_addition_binary_si_decimal_exponent() {
let q1 = parse_quantity_string("12Mi").unwrap().1;
Expand Down
6 changes: 6 additions & 0 deletions src/scale.rs
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Expand Up @@ -2,6 +2,8 @@
/// scales are omitted for mathematical simplicity.
#[derive(PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Default)]
pub(crate) enum Scale {
Nano,
Micro,
Milli,
#[default]
One,
Expand All @@ -25,6 +27,8 @@ impl From<&Scale> for i32 {
fn from(value: &Scale) -> Self {
// https://en.wikipedia.org/wiki/Kilobyte
match value {
Scale::Nano => -3,
Scale::Micro => -2,
Scale::Milli => -1,
Scale::One => 0,
Scale::Kilo => 1,
Expand All @@ -42,6 +46,8 @@ impl TryFrom<i32> for Scale {

fn try_from(value: i32) -> Result<Self, Self::Error> {
match value {
-3 => Ok(Scale::Nano),
-2 => Ok(Scale::Micro),
-1 => Ok(Scale::Milli),
0 => Ok(Scale::One),
1 => Ok(Scale::Kilo),
Expand Down
4 changes: 4 additions & 0 deletions src/utils.rs
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Expand Up @@ -4,6 +4,8 @@ use crate::{format::Format, scale::Scale};
pub(crate) fn scale_format_to_string(scale: &Scale, format: &Format) -> String {
match format {
Format::BinarySI => match scale {
Scale::Nano => "n".to_owned(),
Scale::Micro => "u".to_owned(),
Comment on lines +7 to +8
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Ah, like Milli, I suppose these should be "", given they aren't applicable?

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That's a good question.
I'll have to look into the kube source and how they are handling it.

In the current implementation in this crate, I assumed that Milli would be the smallest unit, and then I "upgraded" it to a simple decimal. However, considering there are smaller denominations, this might need to be changed, and the smaller units should be returned. (Or add modulo logic so that if the value modulo 1000 is 0, the next higher unit is used, and the number is divided by 1000).

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But this should not block this PR from getting merged, as from a mathematical point of view, the results are correct.

Scale::Milli => "".to_owned(),
Scale::One => "".to_owned(),
Scale::Kilo => "Ki".to_owned(),
Expand All @@ -14,6 +16,8 @@ pub(crate) fn scale_format_to_string(scale: &Scale, format: &Format) -> String {
Scale::Exa => "Ei".to_owned(),
},
Format::DecimalSI => match scale {
Scale::Nano => "n".to_owned(),
Scale::Micro => "u".to_owned(),
Scale::Milli => "m".to_owned(),
Scale::One => "".to_owned(),
Scale::Kilo => "k".to_owned(),
Expand Down