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use crate::util::*;
use std::fmt;
/// A time series selector that is gradually built from a metric name and/or
/// a set of label matchers.
#[derive(Debug, Clone, PartialEq)]
pub struct Selector<'a> {
pub(crate) labels: Vec<Label<'a>>,
}
impl<'a> Default for Selector<'a> {
fn default() -> Self {
Self::new()
}
}
impl<'a> Selector<'a> {
/// Create a new instance of [Selector].
pub fn new() -> Self {
Selector { labels: vec![] }
}
/// Select a metric name for this [Selector].
///
/// ```rust
/// use prometheus_http_query::Selector;
///
/// let select = Selector::new().metric("http_requests_total");
///
/// // This is equal to:
/// let other_select = Selector::new().eq("__name__", "http_requests_total");
///
/// assert_eq!(select, other_select);
/// ```
pub fn metric(mut self, metric: &'a str) -> Self
where
Self: Sized,
{
self.labels.push(Label::Equal(("__name__", metric)));
self
}
/// Append a label matcher to the set of matchers of [Selector] that
/// selects labels that match the provided string.<br>
/// PromQL equivalent: `http_requests_total{job="apiserver"}`
///
/// ```rust
/// use prometheus_http_query::Selector;
///
/// let select = Selector::new()
/// .metric("http_requests_total")
/// .eq("job", "apiserver")
/// .to_string();
///
/// let expected = r#"{__name__="http_requests_total",job="apiserver"}"#.to_string();
///
/// assert_eq!(select, expected);
/// ```
pub fn eq(mut self, label: &'a str, value: &'a str) -> Self
where
Self: Sized,
{
self.labels.push(Label::Equal((label, value)));
self
}
/// Append a label matcher to the set of matchers of [Selector] that
/// selects labels that do not match the provided string.<br>
/// PromQL equivalent: `http_requests_total{job!="apiserver"}`
///
/// ```rust
/// use prometheus_http_query::Selector;
///
/// let select = Selector::new()
/// .metric("http_requests_total")
/// .ne("job", "apiserver")
/// .to_string();
///
/// let expected = r#"{__name__="http_requests_total",job!="apiserver"}"#.to_string();
///
/// assert_eq!(select, expected);
/// ```
pub fn ne(mut self, label: &'a str, value: &'a str) -> Self
where
Self: Sized,
{
self.labels.push(Label::NotEqual((label, value)));
self
}
/// Append a label matcher to the set of matchers of [Selector] that
/// selects labels that regex-match the provided string.
/// PromQL equivalent: `http_requests_total{job=~"apiserver"}`
///
/// ```rust
/// use prometheus_http_query::Selector;
///
/// let select = Selector::new()
/// .metric("http_requests_total")
/// .regex_eq("job", "apiserver")
/// .to_string();
///
/// let expected = r#"{__name__="http_requests_total",job=~"apiserver"}"#.to_string();
///
/// assert_eq!(select, expected);
/// ```
pub fn regex_eq(mut self, label: &'a str, value: &'a str) -> Self
where
Self: Sized,
{
self.labels.push(Label::RegexEqual((label, value)));
self
}
/// Append a label matcher to the set of matchers of [Selector] that
/// selects labels that do not regex-match the provided string.<br>
/// PromQL equivalent: `http_requests_total{job!~"apiserver"}`
///
/// ```rust
/// use prometheus_http_query::Selector;
///
/// let select = Selector::new()
/// .metric("http_requests_total")
/// .regex_ne("job", "apiserver")
/// .to_string();
///
/// let expected = r#"{__name__="http_requests_total",job!~"apiserver"}"#.to_string();
///
/// assert_eq!(select, expected);
/// ```
pub fn regex_ne(mut self, label: &'a str, value: &'a str) -> Self
where
Self: Sized,
{
self.labels.push(Label::RegexNotEqual((label, value)));
self
}
}
impl<'a> fmt::Display for Selector<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
let matchers = self
.labels
.iter()
.map(|l| l.to_string())
.collect::<Vec<String>>();
write!(f, "{{{}}}", matchers.as_slice().join(","))
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::util::Label;
#[test]
fn test_selector_display_impl() {
let s = Selector {
labels: vec![
Label::Equal(("__name__", "http_requests_total")),
Label::Equal(("handler", "/api/comments")),
Label::RegexEqual(("job", ".*server")),
Label::RegexNotEqual(("status", "4..")),
Label::NotEqual(("env", "test")),
],
};
let result = String::from("{__name__=\"http_requests_total\",handler=\"/api/comments\",job=~\".*server\",status!~\"4..\",env!=\"test\"}");
assert_eq!(s.to_string(), result);
}
}