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use std::str::FromStr;
use std::time::Duration;
use thiserror::Error;
#[derive(Debug, Error)]
pub enum InvalidLatencyMatrix {
#[error(
"invalid line dimension: line {line} had dimension {dimension} but expected {expected}"
)]
InvalidLineDimension {
line: usize,
dimension: usize,
expected: usize,
},
#[error("invalid latency value '{value}': {error}")]
InvalidLatencyValue { value: String, error: String },
}
pub enum TimeUnit {
Seconds,
Milliseconds,
}
#[derive(Debug, Clone)]
pub struct LatencyMatrix {
dimension: usize,
latencies: Vec<Duration>,
}
impl LatencyMatrix {
fn new(dimension: usize, latencies: Vec<Duration>) -> Self {
assert_eq!(dimension * dimension, latencies.len());
Self {
dimension,
latencies,
}
}
pub fn latency(&self, row: usize, col: usize) -> Duration {
self.latencies[self.dimension * row + col]
}
pub fn dimension(&self) -> usize {
self.dimension
}
pub fn parse(content: &str, unit: TimeUnit) -> Result<Self, InvalidLatencyMatrix> {
let mut dimension = None;
let mut latencies = Vec::default();
for (line_idx, line) in content.lines().enumerate() {
let line = line.trim();
if line.is_empty() {
continue;
}
let mut current_dimension = 0;
for component in line.split_whitespace() {
current_dimension += 1;
let component_value = match component.parse::<f64>() {
Ok(value) => value,
Err(err) => {
return Err(InvalidLatencyMatrix::InvalidLatencyValue {
value: component.to_string(),
error: err.to_string(),
});
}
};
latencies.push(Duration::from_secs_f64(match unit {
TimeUnit::Seconds => component_value,
TimeUnit::Milliseconds => component_value / 1000.0,
}));
}
match dimension {
Some(dimension) => {
if current_dimension != dimension {
return Err(InvalidLatencyMatrix::InvalidLineDimension {
line: line_idx,
dimension: current_dimension,
expected: dimension,
});
}
}
None => dimension = Some(current_dimension),
}
}
Ok(Self::new(dimension.unwrap_or(0), latencies))
}
}
impl FromStr for LatencyMatrix {
type Err = InvalidLatencyMatrix;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::parse(s, TimeUnit::Milliseconds)
}
}
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