praxis-proxy-core 0.1.0

Configuration, error types, and server factory for Praxis
Documentation 
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// SPDX-License-Identifier: LGPL-3.0-only
// Copyright (c) 2024 Shane Utt

//! Endpoint count and weight validation for clusters.

use super::MAX_ENDPOINTS;
use crate::{config::Cluster, errors::ProxyError};

// -----------------------------------------------------------------------------
// Endpoint Validation
// -----------------------------------------------------------------------------

/// Validate endpoint count and per-endpoint weights for a single cluster.
pub(super) fn validate_endpoints(cluster: &Cluster) -> Result<(), ProxyError> {
    if cluster.endpoints.is_empty() {
        return Err(ProxyError::Config(format!(
            "cluster '{}' has no endpoints",
            cluster.name
        )));
    }
    if cluster.endpoints.len() > MAX_ENDPOINTS {
        return Err(ProxyError::Config(format!(
            "cluster '{}' has too many endpoints ({}, max {MAX_ENDPOINTS})",
            cluster.name,
            cluster.endpoints.len()
        )));
    }
    for ep in &cluster.endpoints {
        if ep.weight() == 0 {
            return Err(ProxyError::Config(format!(
                "cluster '{}': endpoint '{}' has weight 0 (must be >= 1)",
                cluster.name,
                ep.address()
            )));
        }
    }
    Ok(())
}

// -----------------------------------------------------------------------------
// Tests
// -----------------------------------------------------------------------------

#[cfg(test)]
mod tests {
    use super::super::validate_clusters;
    use crate::config::{Cluster, Config, InsecureOptions};

    #[test]
    fn reject_empty_endpoints() {
        let clusters = vec![Cluster::with_defaults("empty", vec![])];
        let err = validate_clusters(&clusters, &InsecureOptions::default()).unwrap_err();
        assert!(err.to_string().contains("cluster 'empty' has no endpoints"));
    }

    #[test]
    fn validate_clusters_rejects_empty_endpoints() {
        let clusters = vec![Cluster::with_defaults("empty", vec![])];
        let err = validate_clusters(&clusters, &InsecureOptions::default()).unwrap_err();
        assert!(err.to_string().contains("has no endpoints"));
    }

    #[test]
    fn reject_zero_weight_endpoint() {
        let yaml = r#"
listeners:
  - name: web
    address: "0.0.0.0:80"
    filter_chains: [main]
filter_chains:
  - name: main
    filters:
      - filter: static_response
        status: 200
clusters:
  - name: "backend"
    endpoints:
      - address: "10.0.0.1:80"
        weight: 0
"#;
        let err = Config::from_yaml(yaml).unwrap_err();
        assert!(err.to_string().contains("weight 0"), "got: {err}");
    }
}