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

//! Shorthand routing rules.

use std::{collections::HashMap, sync::Arc};

use serde::{Deserialize, Serialize};

// -----------------------------------------------------------------------------
// Route
// -----------------------------------------------------------------------------

/// A routing rule mapping requests to a cluster.
///
/// ```
/// use praxis_core::config::Route;
///
/// let route: Route = serde_yaml::from_str(
///     r#"
/// path_prefix: "/api"
/// cluster: backend
/// "#,
/// )
/// .unwrap();
/// assert_eq!(route.path_prefix, "/api");
/// assert_eq!(&*route.cluster, "backend");
/// assert!(route.host.is_none());
/// assert!(route.headers.is_none());
/// ```
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct Route {
    /// Path prefix to match. The longest matching prefix wins.
    pub path_prefix: String,

    /// Host to match. If set, the route only applies to this host.
    #[serde(default)]
    pub host: Option<String>,

    /// Request headers to match. All specified headers must be present
    /// with matching values (AND semantics, case-sensitive).
    #[serde(default)]
    pub headers: Option<HashMap<String, String>>,

    /// Name of the cluster to route matched requests to.
    pub cluster: Arc<str>,
}

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

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn parse_route_without_host() {
        let yaml = r#"
path_prefix: "/api"
cluster: "backend"
"#;
        let route: Route = serde_yaml::from_str(yaml).unwrap();
        assert_eq!(route.path_prefix, "/api", "path_prefix mismatch");
        assert_eq!(&*route.cluster, "backend", "cluster mismatch");
        assert!(route.host.is_none(), "host should be None when omitted");
    }

    #[test]
    fn parse_route_with_headers() {
        let yaml = r#"
path_prefix: "/"
cluster: "backend"
headers:
  x-model: "claude-sonnet-4-5"
  x-version: "v1"
"#;
        let route: Route = serde_yaml::from_str(yaml).unwrap();
        let headers = route.headers.unwrap();
        assert_eq!(headers.len(), 2, "should have 2 header constraints");
        assert_eq!(
            headers.get("x-model").unwrap(),
            "claude-sonnet-4-5",
            "x-model header mismatch"
        );
        assert_eq!(headers.get("x-version").unwrap(), "v1", "x-version header mismatch");
    }

    #[test]
    fn parse_route_with_host() {
        let yaml = r#"
path_prefix: "/"
host: "api.example.com"
cluster: "api"
"#;
        let route: Route = serde_yaml::from_str(yaml).unwrap();
        assert_eq!(route.host.as_deref(), Some("api.example.com"), "host should be parsed");
    }
}