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use std::collections::HashMap;
use std::sync::Arc;
use crate::server::database::PvDatabase;
use crate::types::EpicsValue;
use tokio::sync::watch;
use tokio::task::JoinHandle;
use super::error::{AutosaveError, AutosaveResult};
use super::save_file;
use super::save_set::{
RestoreResult, SaveSet, SaveSetConfig, SaveSetStatus, SaveStrategy, TriggerMode,
};
/// Builder for constructing an AutosaveManager.
pub struct AutosaveBuilder {
save_sets: Vec<SaveSetConfig>,
global_macros: HashMap<String, String>,
status_prefix: Option<String>,
}
impl AutosaveBuilder {
pub fn new() -> Self {
Self {
save_sets: Vec::new(),
global_macros: HashMap::new(),
status_prefix: None,
}
}
pub fn add_set(mut self, config: SaveSetConfig) -> Self {
self.save_sets.push(config);
self
}
pub fn macros(mut self, macros: HashMap<String, String>) -> Self {
self.global_macros = macros;
self
}
pub fn status_prefix(mut self, prefix: &str) -> Self {
self.status_prefix = Some(prefix.to_string());
self
}
pub async fn build(self) -> AutosaveResult<AutosaveManager> {
let mut sets = Vec::new();
for mut cfg in self.save_sets {
// Merge global macros (config overrides globals)
for (k, v) in &self.global_macros {
cfg.macros.entry(k.clone()).or_insert_with(|| v.clone());
}
let save_set = SaveSet::new(cfg).await?;
sets.push((Arc::new(save_set), Arc::new(tokio::sync::Mutex::new(()))));
}
let (shutdown_tx, _) = watch::channel(false);
Ok(AutosaveManager {
sets,
status_prefix: self.status_prefix,
shutdown: shutdown_tx,
})
}
}
/// Manages multiple save sets with task orchestration.
pub struct AutosaveManager {
sets: Vec<(Arc<SaveSet>, Arc<tokio::sync::Mutex<()>>)>,
status_prefix: Option<String>,
shutdown: watch::Sender<bool>,
}
impl AutosaveManager {
/// Restore all save sets. Returns results per set.
pub async fn restore_all(
&self,
db: &PvDatabase,
) -> Vec<(String, AutosaveResult<RestoreResult>)> {
let mut results = Vec::new();
for (set, _lock) in &self.sets {
let name = set.config().name.clone();
let result = set.restore_once(db).await;
results.push((name, result));
}
results
}
/// Start all periodic/triggered/onchange tasks. Returns a join handle.
pub fn start(self: Arc<Self>, db: Arc<PvDatabase>) -> JoinHandle<()> {
tokio::spawn(async move {
let mut handles = Vec::new();
for (set, lock) in &self.sets {
let mut shutdown_rx = self.shutdown.subscribe();
let set = set.clone();
let lock = lock.clone();
let db = db.clone();
let status_prefix = self.status_prefix.clone();
let handle = match set.config().strategy.clone() {
SaveStrategy::Periodic { interval } => {
tokio::spawn(async move {
let mut ticker = tokio::time::interval(interval);
ticker.tick().await; // first tick is immediate, skip it
loop {
tokio::select! {
_ = ticker.tick() => {
let _guard = lock.lock().await;
let result = set.save_once(&db).await;
if let Some(ref prefix) = status_prefix {
update_status_pvs(&db, prefix, &set, &result).await;
}
}
_ = shutdown_rx.changed() => {
if *shutdown_rx.borrow() {
break;
}
}
}
}
})
}
SaveStrategy::Triggered {
trigger_pv,
mode,
poll_interval,
} => {
tokio::spawn(async move {
let mut ticker = tokio::time::interval(poll_interval);
let mut last_value: Option<String> = None;
let mut armed = true; // For NonZero: armed when last was 0
loop {
tokio::select! {
_ = ticker.tick() => {
let current = db.get_pv(&trigger_pv).await.ok();
let current_str = current.as_ref().map(|v| v.to_string());
let should_save = match mode {
TriggerMode::AnyChange => {
let changed = last_value.as_ref() != current_str.as_ref()
&& last_value.is_some();
last_value = current_str;
changed
}
TriggerMode::NonZero => {
let is_nonzero = current.as_ref()
.and_then(|v| v.to_f64())
.map_or(false, |v| v != 0.0);
if !is_nonzero {
armed = true;
last_value = current_str;
false
} else if armed && last_value.is_some() {
armed = false;
last_value = current_str;
true
} else {
last_value = current_str;
false
}
}
};
if should_save {
let _guard = lock.lock().await;
let result = set.save_once(&db).await;
if let Some(ref prefix) = status_prefix {
update_status_pvs(&db, prefix, &set, &result).await;
}
}
}
_ = shutdown_rx.changed() => {
if *shutdown_rx.borrow() {
break;
}
}
}
}
})
}
SaveStrategy::OnChange {
min_interval,
float_epsilon,
} => tokio::spawn(async move {
let mut ticker = tokio::time::interval(min_interval);
let mut last_snapshot: HashMap<String, String> = HashMap::new();
loop {
tokio::select! {
_ = ticker.tick() => {
let pv_names = set.pv_names();
let mut current_snapshot = HashMap::new();
let mut changed = false;
for pv in &pv_names {
if let Ok(val) = db.get_pv(pv).await {
let val_str = save_file::value_to_save_str(&val);
if let Some(old_str) = last_snapshot.get(pv) {
if !values_equal_str(old_str, &val_str, float_epsilon) {
changed = true;
}
}
current_snapshot.insert(pv.clone(), val_str);
}
}
if changed && !last_snapshot.is_empty() {
let _guard = lock.lock().await;
let result = set.save_once(&db).await;
if let Some(ref prefix) = status_prefix {
update_status_pvs(&db, prefix, &set, &result).await;
}
}
last_snapshot = current_snapshot;
}
_ = shutdown_rx.changed() => {
if *shutdown_rx.borrow() {
break;
}
}
}
}
}),
SaveStrategy::Manual => {
// No background task for manual sets
continue;
}
};
handles.push(handle);
}
// Wait for all tasks to complete
for h in handles {
let _ = h.await;
}
})
}
/// Manual save for a specific set.
pub async fn manual_save(&self, set_name: &str, db: &PvDatabase) -> AutosaveResult<usize> {
let (set, lock) = self
.find_set(set_name)
.ok_or_else(|| AutosaveError::PvNotFound(format!("save set '{set_name}' not found")))?;
let _guard = lock.lock().await;
set.save_once(db).await
}
/// Manual restore for a specific set.
pub async fn manual_restore(
&self,
set_name: &str,
db: &PvDatabase,
) -> AutosaveResult<RestoreResult> {
let (set, _lock) = self
.find_set(set_name)
.ok_or_else(|| AutosaveError::PvNotFound(format!("save set '{set_name}' not found")))?;
set.restore_once(db).await
}
/// Get status of all save sets.
pub async fn status_all(&self) -> Vec<(String, SaveSetStatus)> {
let mut results = Vec::new();
for (set, _) in &self.sets {
results.push((set.config().name.clone(), set.status().await));
}
results
}
/// Send shutdown signal to all tasks.
pub fn shutdown(&self) {
let _ = self.shutdown.send(true);
}
/// Get the list of save set names.
pub fn set_names(&self) -> Vec<String> {
self.sets
.iter()
.map(|(s, _)| s.config().name.clone())
.collect()
}
/// Find a save set by name.
fn find_set(&self, name: &str) -> Option<(Arc<SaveSet>, Arc<tokio::sync::Mutex<()>>)> {
self.sets
.iter()
.find(|(s, _)| s.config().name == name)
.map(|(s, l)| (s.clone(), l.clone()))
}
/// Access sets for testing.
pub fn sets(&self) -> &[(Arc<SaveSet>, Arc<tokio::sync::Mutex<()>>)] {
&self.sets
}
}
/// Compare two stringified values with float epsilon tolerance.
fn values_equal_str(a: &str, b: &str, epsilon: f64) -> bool {
if a == b {
return true;
}
// Try numeric comparison with epsilon
if let (Ok(fa), Ok(fb)) = (a.parse::<f64>(), b.parse::<f64>()) {
return (fa - fb).abs() <= epsilon;
}
false
}
/// Update status PVs after a save cycle.
async fn update_status_pvs(
db: &PvDatabase,
prefix: &str,
set: &SaveSet,
result: &AutosaveResult<usize>,
) {
let set_name = &set.config().name;
let status_code = match result {
Ok(_) => 0i32,
Err(_) => 2i32,
};
let _ = db
.put_pv_no_process(
&format!("{prefix}SR_{set_name}_status"),
EpicsValue::Long(status_code),
)
.await;
if let Ok(count) = result {
let _ = db
.put_pv_no_process(
&format!("{prefix}SR_{set_name}_savedCount"),
EpicsValue::Long(*count as i32),
)
.await;
}
let _ = db
.put_pv_no_process(&format!("{prefix}SR_status"), EpicsValue::Long(status_code))
.await;
// Heartbeat
if let Ok(current) = db.get_pv(&format!("{prefix}SR_heartbeat")).await {
if let Some(v) = current.to_f64() {
let _ = db
.put_pv_no_process(
&format!("{prefix}SR_heartbeat"),
EpicsValue::Long(v as i32 + 1),
)
.await;
}
}
}