cerebro 1.1.7

A blazing-fast AI memory layer that enables teams of specialized agents to collaborate through a shared cognitive architecture.
Documentation 
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use crate::traits::{CerebroError, KVStore, Result};
use async_trait::async_trait;
use std::collections::HashMap;
use std::sync::{Arc, RwLock};

/// A fast, in-memory Key-Value store for Working Memory and immediate state.
#[derive(Clone, Default)]
pub struct MemoryKVStore {
    data: Arc<RwLock<HashMap<String, String>>>,
}

impl MemoryKVStore {
    pub fn new() -> Self {
        Self {
            data: Arc::new(RwLock::new(HashMap::new())),
        }
    }
}

#[async_trait]
impl KVStore for MemoryKVStore {
    async fn set(&self, key: &str, value: &str) -> Result<()> {
        let mut store = self
            .data
            .write()
            .map_err(|_| CerebroError::StorageError("Lock poisoned".into()))?;
        store.insert(key.to_string(), value.to_string());
        Ok(())
    }

    async fn get(&self, key: &str) -> Result<Option<String>> {
        let store = self
            .data
            .read()
            .map_err(|_| CerebroError::StorageError("Lock poisoned".into()))?;
        Ok(store.get(key).cloned())
    }
}

/// An Event-Sourced Key-Value store that enables "Time-Traveling Memory".
/// Instead of overwriting values, it appends changes to a timeline.
#[derive(Clone, Default)]
pub struct EventSourcedKVStore {
    timeline: Arc<RwLock<Vec<(String, String)>>>,
}

impl EventSourcedKVStore {
    pub fn new() -> Self {
        Self {
            timeline: Arc::new(RwLock::new(Vec::new())),
        }
    }

    /// Fork the state at a specific point in time (step index) to simulate actions.
    pub async fn get_state_at_step(&self, step: usize) -> Result<HashMap<String, String>> {
        let timeline = self
            .timeline
            .read()
            .map_err(|_| CerebroError::StorageError("Lock poisoned".into()))?;
        let mut state = HashMap::new();
        for (k, v) in timeline.iter().take(step) {
            state.insert(k.clone(), v.clone());
        }
        Ok(state)
    }
}

#[async_trait]
impl KVStore for EventSourcedKVStore {
    async fn set(&self, key: &str, value: &str) -> Result<()> {
        let mut timeline = self
            .timeline
            .write()
            .map_err(|_| CerebroError::StorageError("Lock poisoned".into()))?;
        timeline.push((key.to_string(), value.to_string()));
        Ok(())
    }

    async fn get(&self, key: &str) -> Result<Option<String>> {
        let timeline = self
            .timeline
            .read()
            .map_err(|_| CerebroError::StorageError("Lock poisoned".into()))?;
        for (k, v) in timeline.iter().rev() {
            if k == key {
                return Ok(Some(v.clone()));
            }
        }
        Ok(None)
    }
}

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

    #[tokio::test]
    async fn test_set_and_get() {
        let store = MemoryKVStore::new();
        store.set("session_id", "12345").await.unwrap();

        let val = store.get("session_id").await.unwrap();
        assert_eq!(val, Some("12345".to_string()));

        let empty = store.get("missing").await.unwrap();
        assert_eq!(empty, None);
    }
}