Function eval_vector_selector

nodedb/src/control/promql/evaluator/selector.rs:11–46

(
    ctx: &EvalContext,
    name: Option<&str>,
    matchers: &[super::super::label::LabelMatcher],
    offset: Option<Duration>,
)

use super::EvalContext;

pub fn eval_vector_selector(
    ctx: &EvalContext,
    name: Option<&str>,
    matchers: &[super::super::label::LabelMatcher],
    offset: Option<Duration>,
) -> Result<Value, PromqlError> {
    let eval_ts = ctx.timestamp_ms - offset.map_or(0, |d| d.ms());
    let min_ts = eval_ts - ctx.lookback_ms;

    let mut result = Vec::new();
    for series in &ctx.series {
        if let Some(n) = name
            && series.metric_name() != n
        {
            continue;
        }
        if !matches_all(matchers, &series.labels) {
            continue;
        }

        let sample = series
            .samples
            .iter()
            .rev()
            .find(|s| s.timestamp_ms >= min_ts && s.timestamp_ms <= eval_ts);

        if let Some(s) = sample {
            result.push(InstantSample {
                labels: series.labels.clone(),
                value: s.value,
                timestamp_ms: eval_ts,
            });
        }
    }
    Ok(Value::Vector(result))
}

pub fn eval_matrix_selector(
    ctx: &EvalContext,