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use crate::session::session::Session;
use crate::session::session::SessionDirection;
use crate::session::session::SessionState;
use crate::utils::utils::reverse_flow_id;
use chrono::Utc;
use std::cell::RefCell;
use std::collections::HashMap;
use std::rc::Rc;
/******************************************************************************
* Struct
******************************************************************************/
pub struct SessionManager {
sessions: HashMap<String, Rc<RefCell<Session>>>,
}
/******************************************************************************
* API
******************************************************************************/
impl SessionManager {
pub fn new(capacity: usize) -> SessionManager {
SessionManager {
sessions: HashMap::with_capacity(capacity),
}
}
pub fn update(&mut self, session_id: String) -> Rc<RefCell<Session>> {
let result = self.get_session(&session_id);
if result.is_none() {
// New Session
let mut new_session = Session::new(session_id.clone());
new_session.update_session_current_dir(SessionDirection::C2S);
let rc_new_session = Rc::new(RefCell::new(new_session));
self.insert_session(session_id.clone(), rc_new_session.clone());
rc_new_session
} else {
// Update Session
let rc_old_session = result.unwrap();
rc_old_session
.borrow_mut()
.set_session_state(SessionState::Active);
rc_old_session.borrow_mut().update_session_last_ts();
rc_old_session.borrow_mut().update_session_expire_ts();
// Update Session Direction
if rc_old_session.borrow().get_session_id() == session_id {
rc_old_session
.borrow_mut()
.update_session_current_dir(SessionDirection::C2S);
} else {
rc_old_session
.borrow_mut()
.update_session_current_dir(SessionDirection::S2C);
}
rc_old_session
}
}
pub fn get_session(&self, session_id: &String) -> Option<Rc<RefCell<Session>>> {
let result = self.sessions.get(session_id).map(|session| session.clone());
if result.is_some() {
return result;
}
let reversed_id = reverse_flow_id(session_id);
self.sessions
.get(reversed_id.as_str())
.map(|session| session.clone())
}
pub fn insert_session(&mut self, session_id: String, session: Rc<RefCell<Session>>) {
self.sessions.insert(session_id, session);
}
pub fn remove_session(&mut self, session_id: &str) -> Option<Rc<RefCell<Session>>> {
let result = self.sessions.remove(session_id);
if result.is_some() {
return result;
}
let reversed_id = reverse_flow_id(&session_id.to_string());
self.sessions.remove(reversed_id.as_str())
}
pub fn expire_oldest_session(&mut self) -> Option<Rc<RefCell<Session>>> {
let mut oldest_session: Option<Rc<RefCell<Session>>> = None;
let mut oldest_session_expire_ts = Utc::now().timestamp();
for (_, session) in &self.sessions {
let session_expire_ts = session.borrow().get_session_expire_ts();
if session_expire_ts < oldest_session_expire_ts {
oldest_session = Some(session.clone());
oldest_session_expire_ts = session_expire_ts;
}
}
if oldest_session.is_some() {
let oldest_session_id = oldest_session.clone().unwrap().borrow().get_session_id();
oldest_session
.clone()
.unwrap()
.borrow_mut()
.set_session_state(SessionState::Expired);
oldest_session
.clone()
.unwrap()
.borrow_mut()
.set_session_end_ts(oldest_session_expire_ts);
self.remove_session(&oldest_session_id);
}
oldest_session
}
}
/******************************************************************************
* TEST
******************************************************************************/
#[cfg(test)]
mod tests {
use super::SessionManager;
use crate::session::session::Session;
use std::cell::RefCell;
use std::rc::Rc;
#[test]
fn test_session_manager() {
let session_id = "192.168.0.1->192.168.0.2;UDP->UDP;2345->80;".to_string();
let reversed_id = "192.168.0.2->192.168.0.1;UDP->UDP;80->2345;".to_string();
let session = Rc::new(RefCell::new(Session::new(session_id.clone())));
// Create Session Manager
let mut session_mgr = SessionManager::new(1024);
// Search Session
assert_eq!(session_mgr.get_session(&session_id).is_none(), true);
// Insert Session
session_mgr.insert_session(session_id.clone(), session);
// Update Session
assert_eq!(session_mgr.get_session(&session_id).is_some(), true);
assert_eq!(session_mgr.get_session(&reversed_id).is_some(), true);
// Delete session
assert_eq!(session_mgr.remove_session(&reversed_id).is_some(), true);
// Research Session
assert_eq!(session_mgr.get_session(&session_id).is_none(), true);
assert_eq!(session_mgr.get_session(&reversed_id).is_none(), true);
}
}
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