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use eva_common::prelude::*;
use parking_lot::Mutex;
use std::collections::HashMap;
use std::collections::hash_map::Entry;
use uuid::Uuid;
/// Action termination helper for EVA ICS controller services
pub struct Actt {
pending_by_oid: HashMap<OID, Mutex<HashMap<Uuid, PendingAction>>>,
pending_by_uuid: Mutex<HashMap<Uuid, PendingAction>>,
}
impl Actt {
/// Initialize a new helper object
///
/// All OIDS, managed by the controller must be provided
pub fn new(oids: &[&OID]) -> Self {
let mut pending_by_oid = HashMap::new();
for oid in oids {
pending_by_oid.insert((*oid).clone(), <_>::default());
}
Self {
pending_by_oid,
pending_by_uuid: <_>::default(),
}
}
/// Register additional OID
#[inline]
pub fn register(&mut self, oid: &OID) {
self.pending_by_oid.insert(oid.clone(), <_>::default());
}
/// Unregister OID on-the-flow
#[inline]
pub fn unregister(&mut self, oid: &OID) {
self.pending_by_oid.remove(oid);
}
/// Append new action to the helper
///
/// # Panics
///
/// Will panic if the internal mutexes are poisoned
pub fn append(&self, oid: &OID, uuid: Uuid) -> EResult<()> {
if let Some(actions) = self.pending_by_oid.get(oid) {
let mut a = actions.lock();
let mut a_uuid = self.pending_by_uuid.lock();
if let Entry::Vacant(o) = a.entry(uuid) {
o.insert(PendingAction::new());
a_uuid.insert(uuid, PendingAction::new());
Ok(())
} else {
Err(Error::core("duplicate action UUID"))
}
} else {
Err(Error::core(format!(
"{} is not in PENDING_ACTIONS map",
oid
)))
}
}
/// Remove action from the helper
///
/// If action was appended, it MUST be always removed either by RPC function (if failed to send
/// the action to handler) or by the handler
///
/// The handler checks the returned boolean and marks action canceled in case of false
///
/// After removing, the action no longer can be terminated
///
/// # Panics
///
/// Will panic if the internal mutexes are poisoned
pub fn remove(&self, oid: &OID, uuid: &Uuid) -> EResult<bool> {
if let Some(actions) = self.pending_by_oid.get(oid) {
let mut a = actions.lock();
let mut a_uuid = self.pending_by_uuid.lock();
if let Some(v) = a.remove(uuid) {
if let Some(v_u) = a_uuid.remove(uuid) {
Ok(v.is_active() && v_u.is_active())
} else {
Ok(v.is_active())
}
} else {
Err(Error::not_found("action not found in PENDING_ACTIONS map"))
}
} else {
Err(Error::core(format!(
"{} is not in PENDING_ACTIONS map",
oid
)))
}
}
/// The handler can check is the action active during its execution
///
/// # Panics
///
/// Will panic if the internal mutexes are poisoned
pub fn is_active(&self, oid: &OID, uuid: &Uuid) -> EResult<bool> {
if let Some(actions) = self.pending_by_oid.get(oid) {
let a = actions.lock();
let a_uuid = self.pending_by_uuid.lock();
if let Some(v) = a.get(uuid) {
if let Some(v_u) = a_uuid.get(uuid) {
Ok(v.is_active() && v_u.is_active())
} else {
Ok(v.is_active())
}
} else {
Err(Error::not_found("action not found in PENDING_ACTIONS map"))
}
} else {
Err(Error::core(format!(
"{} is not in PENDING_ACTIONS map",
oid
)))
}
}
/// Mark the action terminated by uuid
///
/// # Panics
///
/// Will panic if the internal mutexes are poisoned
pub fn mark_terminated(&self, uuid: &Uuid) -> EResult<()> {
let mut a_uuid = self.pending_by_uuid.lock();
if let Some(v_u) = a_uuid.get_mut(uuid) {
v_u.cancel();
Ok(())
} else {
Err(Error::not_found(format!("action {} not found", uuid)))
}
}
/// Mark all actions pending for OID terminated
///
/// # Panics
///
/// Will panic if the internal mutexes are poisoned
pub fn mark_killed(&self, oid: &OID) -> EResult<()> {
if let Some(actions) = self.pending_by_oid.get(oid) {
for a in actions.lock().values_mut() {
a.cancel();
}
Ok(())
} else {
Err(Error::core(format!(
"{} is not in PENDING_ACTIONS map",
oid
)))
}
}
}
struct PendingAction {
active: bool,
}
impl PendingAction {
#[inline]
fn new() -> Self {
Self { active: true }
}
#[inline]
fn is_active(&self) -> bool {
self.active
}
#[inline]
fn cancel(&mut self) {
self.active = false;
}
}