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use std::any::Any;
use std::cell::RefCell;
use std::collections::HashMap;
use std::error::Error;
use std::fmt::{Debug, Display, Formatter};
use std::ops::Not;
use std::rc::Rc;
use std::thread;
use std::thread::JoinHandle;
use std::time::{Duration, SystemTime};
use crossbeam_channel::{bounded, unbounded, Sender};
pub use crossbeam_channel::{Receiver, RecvError, RecvTimeoutError, TryRecvError};
use rtlola_frontend::mir::{InputReference, OutputReference, RtLolaMir, Type};
#[cfg(feature = "serde")]
use serde::Serialize;
use crate::config::{Config, ExecutionMode};
use crate::configuration::time::{init_start_time, OutputTimeRepresentation, RelativeFloat, TimeRepresentation};
use crate::evaluator::{Evaluator, EvaluatorData};
use crate::monitor::{Incremental, Input, RawVerdict, Tracer, VerdictRepresentation, Verdicts};
use crate::schedule::schedule_manager::ScheduleManager;
use crate::schedule::DynamicSchedule;
use crate::Monitor;
#[cfg_attr(feature = "serde", derive(Serialize))]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum VerdictKind {
Timed,
Event,
}
#[derive(Debug, Clone, Copy)]
pub enum QueueLength {
Unbounded,
Bounded(usize),
}
impl QueueLength {
fn to_queue<T>(self) -> (Sender<T>, Receiver<T>) {
match self {
QueueLength::Unbounded => unbounded(),
QueueLength::Bounded(cap) => bounded(cap),
}
}
}
#[derive(Debug)]
pub enum QueueError {
SourceError(Box<dyn Error + Send>),
ThreadPanic(String),
ThreadSendError(Box<dyn Any + Send>),
MultipleStart,
EventBeforeStart,
}
impl Display for QueueError {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
QueueError::SourceError(e) => write!(f, "Event Source error: {}", e),
QueueError::ThreadPanic(reason) => write!(f, "Worker thread hung up: {}", reason),
QueueError::ThreadSendError(msg) => write!(f, "Failed to send message: {:?}", msg),
QueueError::MultipleStart => write!(f, "Multiple start commands sent"),
QueueError::EventBeforeStart => write!(f, "Received an event before a start was called"),
}
}
}
impl Error for QueueError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
QueueError::SourceError(e) => Some(e.as_ref()),
QueueError::ThreadPanic(_) => None,
QueueError::ThreadSendError(_) => None,
QueueError::MultipleStart => None,
QueueError::EventBeforeStart => None,
}
}
}
#[cfg_attr(feature = "serde", derive(Serialize))]
#[derive(Debug, Clone)]
pub struct QueuedVerdict<Verdict: VerdictRepresentation, VerdictTime: OutputTimeRepresentation> {
pub kind: VerdictKind,
pub ts: VerdictTime::InnerTime,
pub verdict: Verdict,
}
#[allow(missing_debug_implementations)]
pub struct QueuedMonitor<Source, SourceTime, Verdict = Incremental, VerdictTime = RelativeFloat>
where
Source: Input,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation + 'static,
{
ir: RtLolaMir,
worker: Option<JoinHandle<Result<(), QueueError>>>,
input: Sender<WorkItem<Source, SourceTime>>,
output: Receiver<QueuedVerdict<Verdict, VerdictTime>>,
}
impl<Source, SourceTime, Verdict, VerdictTime> QueuedMonitor<Source, SourceTime, Verdict, VerdictTime>
where
Source: Input + 'static,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation,
{
pub fn bounded_setup(
config: Config<SourceTime, VerdictTime>,
setup_data: Source::CreationData,
input_queue_bound: QueueLength,
output_queue_bound: QueueLength,
) -> QueuedMonitor<Source, SourceTime, Verdict, VerdictTime> {
let config_clone = config.clone();
let input_map = config
.ir
.inputs
.iter()
.map(|i| (i.name.clone(), i.reference.in_ix()))
.collect();
let (input_send, input_rcv) = input_queue_bound.to_queue();
let (output_send, output_rcv) = output_queue_bound.to_queue();
let worker = match config.mode {
ExecutionMode::Offline => {
thread::spawn(move || {
Self::runner::<OfflineWorker<Source, SourceTime, Verdict, VerdictTime>>(
config_clone,
input_map,
setup_data,
input_rcv,
output_send,
)
})
},
ExecutionMode::Online => {
thread::spawn(move || {
Self::runner::<OnlineWorker<Source, SourceTime, Verdict, VerdictTime>>(
config_clone,
input_map,
setup_data,
input_rcv,
output_send,
)
})
},
};
QueuedMonitor {
ir: config.ir,
worker: Some(worker),
input: input_send,
output: output_rcv,
}
}
pub fn setup(
config: Config<SourceTime, VerdictTime>,
setup_data: Source::CreationData,
) -> QueuedMonitor<Source, SourceTime, Verdict, VerdictTime> {
Self::bounded_setup(config, setup_data, QueueLength::Unbounded, QueueLength::Unbounded)
}
fn runner<W: Worker<Source, SourceTime, Verdict, VerdictTime>>(
config: Config<SourceTime, VerdictTime>,
input_names: HashMap<String, InputReference>,
setup_data: Source::CreationData,
input: Receiver<WorkItem<Source, SourceTime>>,
output: Sender<QueuedVerdict<Verdict, VerdictTime>>,
) -> Result<(), QueueError> {
let mut worker = W::setup(config, input_names, setup_data, input.clone(), output)?;
worker.wait_for_start(&input)?;
drop(input);
worker.init()?;
worker.process()?;
Ok(())
}
fn worker_alive(&mut self) -> Result<(), QueueError> {
if self.worker.is_some() {
return if self.worker.as_ref().unwrap().is_finished() {
let worker = self.worker.take().unwrap();
worker.join().map_err(|e| QueueError::ThreadPanic(format!("{:?}", e)))?
} else {
Ok(())
};
} else {
Err(QueueError::ThreadPanic("Worker thread died.".to_string()))
}
}
pub fn start(&mut self) -> Result<(), QueueError> {
self.worker_alive()?;
self.input
.send(WorkItem::Start)
.map_err(|msg| QueueError::ThreadSendError(Box::new(msg.0)))
}
pub fn output_queue(&self) -> Receiver<QueuedVerdict<Verdict, VerdictTime>> {
self.output.clone()
}
pub fn accept_event(&mut self, ev: Source::Record, ts: SourceTime::InnerTime) -> Result<(), QueueError> {
self.worker_alive()?;
self.input
.send(WorkItem::Event(ev, ts))
.map_err(|msg| QueueError::ThreadSendError(Box::new(msg.0)))
}
pub fn end(self) -> Result<(), QueueError> {
let QueuedMonitor { worker, input, .. } = self;
drop(input);
if let Some(worker) = worker {
worker.join().map_err(|e| QueueError::ThreadPanic(format!("{:?}", e)))?
} else {
Ok(())
}
}
pub fn ir(&self) -> &RtLolaMir {
&self.ir
}
pub fn name_for_input(&self, id: InputReference) -> &str {
self.ir.inputs[id].name.as_str()
}
pub fn name_for_output(&self, id: OutputReference) -> &str {
self.ir.outputs[id].name.as_str()
}
pub fn trigger_message(&self, id: usize) -> &str {
self.ir.triggers[id].message.as_str()
}
pub fn trigger_stream_index(&self, id: usize) -> usize {
self.ir.triggers[id].reference.out_ix()
}
pub fn number_of_input_streams(&self) -> usize {
self.ir.inputs.len()
}
pub fn number_of_output_streams(&self) -> usize {
self.ir.outputs.len()
}
pub fn number_of_triggers(&self) -> usize {
self.ir.triggers.len()
}
pub fn type_of_input(&self, id: InputReference) -> &Type {
&self.ir.inputs[id].ty
}
pub fn type_of_output(&self, id: OutputReference) -> &Type {
&self.ir.outputs[id].ty
}
pub fn extend_rate_of_output(&self, id: OutputReference) -> Option<Duration> {
self.ir
.time_driven
.iter()
.find(|time_driven_stream| time_driven_stream.reference.out_ix() == id)
.map(|time_driven_stream| time_driven_stream.period_in_duration())
}
}
enum WorkItem<Source: Input, SourceTime: TimeRepresentation> {
Start,
Event(Source::Record, SourceTime::InnerTime),
}
trait Worker<Source, SourceTime, Verdict, VerdictTime>: Sized
where
Source: Input,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation + 'static,
{
fn setup(
config: Config<SourceTime, VerdictTime>,
input_names: HashMap<String, InputReference>,
setup_data: Source::CreationData,
input: Receiver<WorkItem<Source, SourceTime>>,
output: Sender<QueuedVerdict<Verdict, VerdictTime>>,
) -> Result<Self, QueueError>;
fn wait_for_start(&mut self, input: &Receiver<WorkItem<Source, SourceTime>>) -> Result<(), QueueError> {
match input.recv() {
Ok(WorkItem::Start) => Ok(()),
Ok(WorkItem::Event(_, _)) => Err(QueueError::EventBeforeStart),
Err(_) => Ok(()),
}
}
fn init(&mut self) -> Result<(), QueueError>;
fn process(&mut self) -> Result<(), QueueError>;
fn try_send(
output: &Sender<QueuedVerdict<Verdict, VerdictTime>>,
verdict: Option<QueuedVerdict<Verdict, VerdictTime>>,
) -> Result<(), QueueError> {
if let Some(verdict) = verdict {
output
.send(verdict)
.map_err(|e| QueueError::ThreadSendError(Box::new(e.0)))
} else {
Ok(())
}
}
}
struct OnlineWorker<Source, SourceTime, Verdict, VerdictTime>
where
Source: Input,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation + 'static,
{
source: Source,
source_time: SourceTime,
output_time: Option<VerdictTime>,
start_time: Option<SystemTime>,
schedule_manager: ScheduleManager,
evaluator: Evaluator,
input: Receiver<WorkItem<Source, SourceTime>>,
output: Sender<QueuedVerdict<Verdict, VerdictTime>>,
}
impl<
Source: Input,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation,
> Worker<Source, SourceTime, Verdict, VerdictTime> for OnlineWorker<Source, SourceTime, Verdict, VerdictTime>
{
fn setup(
config: Config<SourceTime, VerdictTime>,
input_names: HashMap<String, InputReference>,
setup_data: Source::CreationData,
input: Receiver<WorkItem<Source, SourceTime>>,
output: Sender<QueuedVerdict<Verdict, VerdictTime>>,
) -> Result<Self, QueueError> {
let source_time = config.input_time_representation;
let source = Source::new(input_names, setup_data).map_err(|e| QueueError::SourceError(Box::new(e)))?;
let dyn_schedule = Rc::new(RefCell::new(DynamicSchedule::new()));
let eval_data = EvaluatorData::new(config.ir.clone(), dyn_schedule.clone());
let schedule_manager = ScheduleManager::setup(config.ir.clone(), dyn_schedule)
.expect("Error computing schedule for time-driven streams");
let evaluator = eval_data.into_evaluator();
Ok(OnlineWorker {
source,
source_time,
output_time: None,
start_time: config.start_time,
schedule_manager,
evaluator,
input,
output,
})
}
fn init(&mut self) -> Result<(), QueueError> {
init_start_time::<SourceTime>(self.start_time);
self.output_time.replace(VerdictTime::default());
Ok(())
}
fn process(&mut self) -> Result<(), QueueError> {
let output_time = self.output_time.as_mut().expect("Init to be executed before process");
loop {
let next_deadline = self.schedule_manager.get_next_due();
let item = if let Some(due) = next_deadline {
self.input.recv_timeout(due)
} else {
self.input.recv().map_err(|_| RecvTimeoutError::Disconnected)
};
let verdict = match item {
Ok(WorkItem::Event(e, ts)) => {
let e = self
.source
.get_event(e)
.map_err(|e| QueueError::SourceError(Box::new(e)))?;
let ts = self.source_time.convert_from(ts);
let mut tracer = Verdict::Tracing::default();
tracer.eval_start();
self.evaluator.eval_event(&e, ts, &mut tracer);
tracer.eval_end();
let verdict = Verdict::create_with_trace(RawVerdict::from(&self.evaluator), tracer);
verdict.is_empty().not().then_some(QueuedVerdict {
kind: VerdictKind::Event,
ts: output_time.convert_into(ts),
verdict,
})
},
Err(RecvTimeoutError::Timeout) => {
let mut tracer = Verdict::Tracing::default();
tracer.eval_start();
let due = next_deadline.expect("timeout to only happen for a deadline.");
let deadline = self.schedule_manager.get_next_deadline(due);
self.evaluator.eval_time_driven_tasks(deadline, due, &mut tracer);
tracer.eval_end();
let verdict = Verdict::create_with_trace(RawVerdict::from(&self.evaluator), tracer);
verdict.is_empty().not().then_some(QueuedVerdict {
kind: VerdictKind::Timed,
ts: output_time.convert_into(due),
verdict,
})
},
Err(RecvTimeoutError::Disconnected) => {
return Ok(());
},
Ok(WorkItem::Start) => {
return Err(QueueError::MultipleStart);
},
};
Self::try_send(&self.output, verdict)?;
}
}
}
struct OfflineWorker<Source, SourceTime, Verdict, VerdictTime>
where
Source: Input,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation + 'static,
{
config: Config<SourceTime, VerdictTime>,
setup_data: Source::CreationData,
monitor: Option<Monitor<Source, SourceTime, Verdict, VerdictTime>>,
input: Receiver<WorkItem<Source, SourceTime>>,
output: Sender<QueuedVerdict<Verdict, VerdictTime>>,
}
impl<
Source: Input,
SourceTime: TimeRepresentation,
Verdict: VerdictRepresentation,
VerdictTime: OutputTimeRepresentation,
> Worker<Source, SourceTime, Verdict, VerdictTime> for OfflineWorker<Source, SourceTime, Verdict, VerdictTime>
{
fn setup(
config: Config<SourceTime, VerdictTime>,
_input_names: HashMap<String, InputReference>,
setup_data: Source::CreationData,
input: Receiver<WorkItem<Source, SourceTime>>,
output: Sender<QueuedVerdict<Verdict, VerdictTime>>,
) -> Result<Self, QueueError> {
Ok(OfflineWorker {
config,
setup_data,
monitor: None,
input,
output,
})
}
fn init(&mut self) -> Result<(), QueueError> {
let monitor: Monitor<Source, SourceTime, Verdict, VerdictTime> =
Monitor::setup(self.config.clone(), self.setup_data.clone())
.map_err(|e| QueueError::SourceError(Box::new(e)))?;
self.monitor.replace(monitor);
Ok(())
}
fn process(&mut self) -> Result<(), QueueError> {
let monitor = self.monitor.as_mut().expect("Init to be called before process");
let mut last_event = None;
let mut done = false;
while !done {
let timed = match self.input.recv() {
Ok(WorkItem::Event(e, ts)) => {
last_event.replace(ts.clone());
let Verdicts { timed, event, ts } = monitor
.accept_event(e, ts)
.map_err(|e| QueueError::SourceError(Box::new(e)))?;
if !event.is_empty() {
let verdict = QueuedVerdict {
kind: VerdictKind::Event,
ts: ts.clone(),
verdict: event,
};
Self::try_send(&self.output, Some(verdict))?;
}
timed
},
Err(_) => {
done = true;
if let Some(last_event) = last_event.as_ref() {
monitor.accept_time(last_event.clone())
} else {
return Ok(());
}
},
Ok(WorkItem::Start) => {
return Err(QueueError::MultipleStart);
},
};
for (ts, v) in timed {
let verdict = QueuedVerdict {
kind: VerdictKind::Timed,
ts,
verdict: v,
};
Self::try_send(&self.output, Some(verdict))?;
}
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use std::time::{Duration, Instant};
use crate::api::monitor::Change;
use crate::monitor::{Event, EventInput, Incremental, Total, VerdictRepresentation};
use crate::queued::{QueuedVerdict, VerdictKind};
use crate::time::RelativeFloat;
use crate::{ConfigBuilder, QueuedMonitor, Value};
fn setup<V: VerdictRepresentation>(
spec: &str,
) -> (
Instant,
QueuedMonitor<EventInput<Event>, RelativeFloat, V, RelativeFloat>,
) {
let monitor = ConfigBuilder::new()
.spec_str(spec)
.offline::<RelativeFloat>()
.event_input::<Event>()
.with_verdict::<V>()
.queued_monitor();
(Instant::now(), monitor)
}
fn sort_total(res: Total) -> Total {
let Total { inputs, mut outputs } = res;
outputs.iter_mut().for_each(|s| s.sort());
Total { inputs, outputs }
}
fn sort_incremental(mut res: Incremental) -> Incremental {
res.iter_mut().for_each(|(_, changes)| changes.sort());
res
}
#[test]
fn test_const_output_literals() {
let (start, mut monitor) = setup::<Total>(
r#"
input i_0: UInt8
output o_0: Bool @i_0 := true
output o_1: UInt8 @i_0 := 3
output o_2: Int8 @i_0 := -5
output o_3: Float32 @i_0 := -123.456
output o_4: String @i_0 := "foobar"
"#,
);
let queue = monitor.output_queue();
monitor.start().expect("Failed to start monitor");
let v = Value::Unsigned(3);
let timeout = Duration::from_millis(500);
monitor
.accept_event(vec![v.clone()], start.elapsed())
.expect("Failed to accept event");
let res = queue.recv_timeout(timeout).unwrap();
assert!(res.kind == VerdictKind::Event);
let res = res.verdict;
assert_eq!(res.inputs[0], Some(v));
assert_eq!(res.outputs[0][0], (None, Some(Value::Bool(true))));
assert_eq!(res.outputs[1][0], (None, Some(Value::Unsigned(3))));
assert_eq!(res.outputs[2][0], (None, Some(Value::Signed(-5))));
assert_eq!(res.outputs[3][0], (None, Some(Value::new_float(-123.456))));
assert_eq!(res.outputs[4][0], (None, Some(Value::Str("foobar".into()))));
}
#[test]
fn test_count_window() {
let (_, mut monitor) =
setup::<Incremental>("input a: UInt16\noutput b: UInt16 @0.25Hz := a.aggregate(over: 40s, using: #)");
let timeout = Duration::from_millis(500);
let output = monitor.output_queue();
monitor.start().expect("Failed to start monitor");
let n = 25;
let mut time = Duration::from_secs(45);
monitor
.accept_event(vec![Value::Unsigned(1)], time)
.expect("Failed to accept event");
let res: Vec<_> = (0..11).map(|_| output.recv_timeout(timeout).unwrap()).collect();
assert!(output.is_empty());
assert!(res.iter().all(|v| v.kind == VerdictKind::Timed));
assert!(res.iter().all(|QueuedVerdict { ts, verdict, .. }| {
ts.as_secs() % 4 == 0 && verdict[0].0 == 0 && verdict[0].1[0] == Change::Value(None, Value::Unsigned(0))
}));
for v in 2..=n {
time += Duration::from_secs(1);
monitor
.accept_event(vec![Value::Unsigned(v)], time)
.expect("Failed to accept event");
if (v - 1) % 4 == 0 {
let res = output.recv_timeout(timeout).unwrap();
assert_eq!(res.kind, VerdictKind::Timed);
assert_eq!(res.verdict[0].1[0], Change::Value(None, Value::Unsigned(v - 1)));
} else {
assert!(output.is_empty());
}
}
}
#[test]
fn test_spawn_eventbased() {
let (_, mut monitor) = setup::<Total>(
"input a: Int32\n\
input b: Int32\n\
output c(x: Int32) spawn with a eval with x + a\n\
output d := b",
);
let timeout = Duration::from_millis(500);
let output = monitor.output_queue();
monitor.start().expect("Failed to start monitor");
monitor
.accept_event(vec![Value::Signed(15), Value::None], Duration::from_secs(1))
.expect("Failed to accept event");
let res = output.recv_timeout(timeout).unwrap();
let expected = Total {
inputs: vec![Some(Value::Signed(15)), None],
outputs: vec![
vec![(Some(vec![Value::Signed(15)]), Some(Value::Signed(30)))],
vec![(None, None)],
],
};
assert_eq!(res.kind, VerdictKind::Event);
assert_eq!(sort_total(res.verdict), sort_total(expected));
monitor
.accept_event(vec![Value::Signed(20), Value::Signed(7)], Duration::from_secs(2))
.expect("Failed to accept event");
let res = output.recv_timeout(timeout).unwrap();
let expected = Total {
inputs: vec![Some(Value::Signed(20)), Some(Value::Signed(7))],
outputs: vec![
vec![
(Some(vec![Value::Signed(15)]), Some(Value::Signed(35))),
(Some(vec![Value::Signed(20)]), Some(Value::Signed(40))),
],
vec![(None, Some(Value::Signed(7)))],
],
};
assert_eq!(res.kind, VerdictKind::Event);
assert_eq!(sort_total(res.verdict), sort_total(expected));
monitor
.accept_event(vec![Value::None, Value::Signed(42)], Duration::from_secs(3))
.expect("Failed to accept event");
let res = output.recv_timeout(timeout).unwrap();
let expected = Total {
inputs: vec![Some(Value::Signed(20)), Some(Value::Signed(42))],
outputs: vec![
vec![
(Some(vec![Value::Signed(15)]), Some(Value::Signed(35))),
(Some(vec![Value::Signed(20)]), Some(Value::Signed(40))),
],
vec![(None, Some(Value::Signed(42)))],
],
};
assert_eq!(res.kind, VerdictKind::Event);
assert_eq!(sort_total(res.verdict), sort_total(expected));
}
#[test]
fn test_eval_close() {
let (_, mut monitor) = setup::<Incremental>(
"input a: Int32\n\
output c(x: Int32)\n\
spawn with a \n\
close @a when true\n\
eval with x + a",
);
let timeout = Duration::from_millis(500);
let output = monitor.output_queue();
monitor.start().expect("Failed to start monitor");
monitor
.accept_event(vec![Value::Signed(15)], Duration::from_secs(1))
.expect("Failed to accept event");
let res = output.recv_timeout(timeout).unwrap();
let mut expected = vec![
Change::Spawn(vec![Value::Signed(15)]),
Change::Value(Some(vec![Value::Signed(15)]), Value::Signed(30)),
Change::Close(vec![Value::Signed(15)]),
];
expected.sort();
assert_eq!(res.kind, VerdictKind::Event);
assert_eq!(res.verdict[0].0, 0);
assert_eq!(sort_incremental(res.verdict)[0].1, expected);
}
}