github-mcp 0.1.0

// GitHub v3 REST API MCP server — generated by mcpify. Do not hand-edit.

use std::collections::HashMap;
use std::sync::Mutex;
use std::time::{Duration, Instant};

struct CacheEntry<T> {
    value: T,
    expires_at: Instant,
}

/// Simple TTL cache backing repeated `search`/`get` lookups.
pub struct QueryCache<T> {
    max_size: usize,
    ttl: Duration,
    store: Mutex<HashMap<String, CacheEntry<T>>>,
}

impl<T: Clone> QueryCache<T> {
    pub fn new(max_size: usize, ttl: Duration) -> Self {
        Self {
            max_size,
            ttl,
            store: Mutex::new(HashMap::new()),
        }
    }

    pub fn get(&self, key: &str) -> Option<T> {
        let mut store = self.store.lock().unwrap();
        let entry = store.get(key)?;
        if Instant::now() > entry.expires_at {
            store.remove(key);
            return None;
        }
        Some(entry.value.clone())
    }

    pub fn set(&self, key: String, value: T) {
        let mut store = self.store.lock().unwrap();
        if store.len() >= self.max_size
            && !store.contains_key(&key)
            && let Some(oldest_key) = store.keys().next().cloned()
        {
            store.remove(&oldest_key);
        }
        store.insert(
            key,
            CacheEntry {
                value,
                expires_at: Instant::now() + self.ttl,
            },
        );
    }

    pub fn clear(&self) {
        self.store.lock().unwrap().clear();
    }
}

impl<T: Clone> Default for QueryCache<T> {
    fn default() -> Self {
        Self::new(500, Duration::from_secs(60))
    }
}

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

    #[test]
    fn returns_a_previously_set_value() {
        let cache: QueryCache<String> = QueryCache::new(10, Duration::from_secs(60));
        cache.set("key".to_string(), "value".to_string());
        assert_eq!(cache.get("key"), Some("value".to_string()));
    }

    #[test]
    fn expires_entries_past_their_ttl() {
        let cache: QueryCache<String> = QueryCache::new(10, Duration::from_millis(1));
        cache.set("key".to_string(), "value".to_string());
        std::thread::sleep(Duration::from_millis(10));
        assert_eq!(cache.get("key"), None);
    }

    #[test]
    fn evicts_when_full() {
        let cache: QueryCache<String> = QueryCache::new(1, Duration::from_secs(60));
        cache.set("a".to_string(), "1".to_string());
        cache.set("b".to_string(), "2".to_string());
        // Exactly one of the two entries should remain — which one is
        // unspecified (no LRU ordering, mirrors the TS `QueryCache`'s
        // `Map` insertion-order eviction only incidentally, not by
        // contract), but the store must not have grown past `max_size`.
        let remaining = [cache.get("a"), cache.get("b")]
            .into_iter()
            .flatten()
            .count();
        assert_eq!(remaining, 1);
    }
}