Implement publishing program next run

sprinklers_actors/src/program_runner.rs

@@ -20,6 +20,7 @@ pub enum ProgramEvent {
     RunStart(ProgramRef),
     RunFinish(ProgramRef),
     RunCancel(ProgramRef),
+    NextRun(ProgramRef, chrono::DateTime<chrono::Local>),
 }
 
 pub type ProgramEventRecv = broadcast::Receiver<ProgramEvent>;
@@ -136,7 +137,7 @@ impl ProgramRunnerInner {
 
     fn update_schedules(&mut self, ctx: &mut actix::Context<ProgramRunnerActor>) {
         let mut scheduled_run_queue = DelayQueue::with_capacity(self.programs.len());
-        for (_, prog) in &self.programs {
+        for (_, prog) in self.programs.clone() {
             if !prog.enabled {
                 continue;
             }
@@ -148,6 +149,7 @@ impl ProgramRunnerInner {
             let delay = (next_run - ref_time).to_std().unwrap();
             trace!("will run program in {:?}", delay);
             scheduled_run_queue.insert(prog.clone(), delay);
+            self.send_event(ProgramEvent::NextRun(prog, next_run));
         }
         let fut = actix::fut::wrap_stream(scheduled_run_queue)
             .map(|item, act: &mut ProgramRunnerActor, ctx| act.handle_scheduled_run(item, ctx))

sprinklers_mqtt/src/lib.rs

@@ -154,6 +154,17 @@ impl MqttInterface {
             .wrap_err("failed to publish program running")
     }
 
+    pub async fn publish_program_next_run(
+        &mut self,
+        program_id: ProgramId,
+        next_run: chrono::DateTime<chrono::Local>,
+    ) -> eyre::Result<()> {
+        let payload = next_run.to_rfc3339();
+        self.publish_data(self.topics.program_next_run(program_id), &payload)
+            .await
+            .wrap_err("failed to publish program next run")
+    }
+
     pub async fn publish_section_runner(&mut self, sr_state: &SecRunnerState) -> eyre::Result<()> {
         let json: SecRunnerStateJson = sr_state.into();
         self.publish_data(self.topics.section_runner(), &json)

sprinklers_mqtt/src/topics.rs

@@ -44,6 +44,11 @@ where
         format!("{}/programs/{}/running", self.prefix.as_ref(), program_id)
     }
 
+    pub fn program_next_run(&self, program_id: ProgramId) -> String {
+        // TODO: reconcile naming convention
+        format!("{}/programs/{}/nextRun", self.prefix.as_ref(), program_id)
+    }
+
     pub fn section_runner(&self) -> String {
         format!("{}/section_runner", self.prefix.as_ref())
     }

sprinklers_mqtt/src/update_listener.rs

@@ -7,7 +7,6 @@ use sprinklers_actors::{
 use actix::{fut::wrap_future, Actor, ActorContext, Addr, AsyncContext, Handler, StreamHandler};
 use futures_util::TryFutureExt;
 use sprinklers_core::model::Programs;
-use std::sync::Arc;
 use tokio::sync::{broadcast, watch};
 use tracing::{trace, warn};
 
@@ -85,18 +84,38 @@ impl StreamHandler<Result<ProgramEvent, broadcast::RecvError>> for UpdateListene
                 return;
             }
         };
-        let (program_id, running) = match event {
-            ProgramEvent::RunStart(prog) => (prog.id, true),
-            ProgramEvent::RunFinish(prog) | ProgramEvent::RunCancel(prog) => (prog.id, false),
-        };
         let mut mqtt_interface = self.mqtt_interface.clone();
         let fut = async move {
+            enum Publish {
+                Running(bool),
+                NextRun(chrono::DateTime<chrono::Local>),
+            }
+
+            let (program_id, publish) = match event {
+                ProgramEvent::RunStart(prog) => (prog.id, Publish::Running(true)),
+                ProgramEvent::RunFinish(prog) | ProgramEvent::RunCancel(prog) => {
+                    (prog.id, Publish::Running(false))
+                }
+                ProgramEvent::NextRun(prog, next_run) => (prog.id, Publish::NextRun(next_run)),
+            };
+            match publish {
+                Publish::Running(running) => {
                     if let Err(err) = mqtt_interface
                         .publish_program_running(program_id, running)
                         .await
                     {
                         warn!("could not publish program running: {}", err);
                     }
+                }
+                Publish::NextRun(next_run) => {
+                    if let Err(err) = mqtt_interface
+                        .publish_program_next_run(program_id, next_run)
+                        .await
+                    {
+                        warn!("could not publish program next run: {}", err);
+                    }
+                }
+            }
         };
         ctx.spawn(wrap_future(fut));
     }

sprinklers_rs/src/main.rs

@@ -39,8 +39,6 @@ async fn main() -> Result<()> {
 
     let state_manager = crate::state_manager::StateManagerThread::start(db_conn);
 
-    program_runner.listen_programs(state_manager.get_programs());
-
     let mqtt_options = mqtt::Options {
         broker_host: "localhost".into(),
         broker_port: 1883,
@@ -62,6 +60,9 @@ async fn main() -> Result<()> {
     update_listener.listen_programs(state_manager.get_programs());
     update_listener.listen_program_events(program_runner.subscribe().await?);
 
+    // Only listen to programs now so above subscriptions get events
+    program_runner.listen_programs(state_manager.get_programs());
+
     program_runner.update_sections(sections.clone()).await?;
     // TODO: update listener should probably do this
     mqtt_interface.publish_sections(&sections).await?;