Implement cancelling by section from MQTT

src/mqtt/request/mod.rs

@@ -1,11 +1,12 @@
 use crate::{model::Sections, section_runner::SectionRunner};
 
+use futures_util::ready;
 use futures_util::FutureExt;
 use num_derive::FromPrimitive;
 use serde::{Deserialize, Serialize};
-use std::{fmt, future::Future, pin::Pin};
+use std::{fmt, future::Future, pin::Pin, task::Poll};
 
-mod run_section;
+mod sections;
 
 pub struct RequestContext {
     pub sections: Sections,
@@ -14,8 +15,6 @@ pub struct RequestContext {
 
 type BoxFuture<Output> = Pin<Box<dyn Future<Output = Output>>>;
 
-pub type ResponseValue = serde_json::Value;
-
 #[derive(Copy, Clone, Debug, PartialEq, Eq, FromPrimitive)]
 #[repr(u16)]
 pub enum ErrorCode {
@@ -156,17 +155,69 @@ impl RequestError {
     }
 }
 
-type RequestResult = Result<ResponseValue, RequestError>;
-type RequestFuture = BoxFuture<RequestResult>;
+#[derive(Debug, Serialize, Deserialize)]
+struct ResponseMessage(#[serde(rename = "message")] String);
+
+impl ResponseMessage {
+    fn new<M>(message: M) -> Self
+    where
+        M: ToString,
+    {
+        ResponseMessage(message.to_string())
+    }
+}
+
+impl From<String> for ResponseMessage {
+    fn from(message: String) -> Self {
+        ResponseMessage(message)
+    }
+}
+
+pub type ResponseValue = serde_json::Value;
+
+type RequestResult<Ok = ResponseValue> = Result<Ok, RequestError>;
+type RequestFuture<Ok = ResponseValue> = BoxFuture<RequestResult<Ok>>;
 
 trait IRequest {
-    fn exec(&mut self, ctx: &mut RequestContext) -> RequestFuture;
+    type Response: Serialize;
+
+    fn exec(&mut self, ctx: &mut RequestContext) -> RequestFuture<Self::Response>;
+
+    fn exec_erased(&mut self, ctx: &mut RequestContext) -> RequestFuture
+    where
+        Self::Response: 'static,
+    {
+        // TODO: figure out how to get rid of this nested box
+        Box::pin(ErasedRequestFuture(self.exec(ctx)))
+    }
+}
+
+struct ErasedRequestFuture<Response>(RequestFuture<Response>)
+where
+    Response: Serialize;
+
+impl<Response> Future for ErasedRequestFuture<Response>
+where
+    Response: Serialize,
+{
+    type Output = RequestResult;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
+        use eyre::WrapErr;
+        let response = ready!(self.as_mut().0.poll_unpin(cx));
+        Poll::Ready(response.and_then(|res| {
+            serde_json::to_value(res)
+                .wrap_err("could not serialize response")
+                .map_err(RequestError::from)
+        }))
+    }
 }
 
 #[derive(Debug, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase", tag = "type")]
 pub enum Request {
-    RunSection(run_section::RequestData),
+    RunSection(sections::RunSectionRequest),
+    CancelSection(sections::CancelSectionRequest),
 }
 
 #[derive(Debug, Deserialize, Serialize)]
@@ -192,9 +243,12 @@ impl From<RequestError> for Response {
 }
 
 impl IRequest for Request {
-    fn exec(&mut self, ctx: &mut RequestContext) -> BoxFuture<RequestResult> {
+    type Response = ResponseValue;
+
+    fn exec(&mut self, ctx: &mut RequestContext) -> RequestFuture {
         match self {
-            Request::RunSection(req) => req.exec(ctx),
+            Request::RunSection(req) => req.exec_erased(ctx),
+            Request::CancelSection(req) => req.exec_erased(ctx),
         }
     }
 }

src/mqtt/request/run_section.rs

@@ -1,43 +0,0 @@
-use super::*;
-use crate::{model::SectionId, section_runner::SectionRunHandle};
-use eyre::WrapErr;
-use serde::{Deserialize, Serialize};
-use std::time::Duration;
-
-#[derive(Debug, Deserialize, Serialize)]
-#[serde(rename_all = "camelCase")]
-pub struct RequestData {
-    pub section_id: SectionId,
-    #[serde(with = "crate::serde::duration")]
-    pub duration: Duration,
-}
-
-#[derive(Debug, Deserialize, Serialize)]
-#[serde(rename_all = "camelCase")]
-pub struct ResponseData {
-    pub message: String,
-    pub run_id: SectionRunHandle,
-}
-
-impl IRequest for RequestData {
-    fn exec(&mut self, ctx: &mut RequestContext) -> RequestFuture {
-        let mut section_runner = ctx.section_runner.clone();
-        let section = ctx.sections.get(&self.section_id).cloned();
-        let duration = self.duration;
-        Box::pin(async move {
-            let section = section.ok_or_else(|| {
-                RequestError::with_name(ErrorCode::NotFound, "section not found", "section")
-            })?;
-            let handle = section_runner
-                .queue_run(section.clone(), duration)
-                .await
-                .wrap_err("could not queue run")?;
-            let res = ResponseData {
-                message: format!("running section '{}' for {:?}", &section.name, duration),
-                run_id: handle,
-            };
-            let res_value = serde_json::to_value(res).wrap_err("could not serialize response")?;
-            Ok(res_value)
-        })
-    }
-}

src/mqtt/request/sections.rs

@@ -0,0 +1,87 @@
+use super::*;
+use crate::{model::SectionRef, section_runner::SectionRunHandle};
+use eyre::WrapErr;
+use serde::{Deserialize, Serialize};
+use std::time::Duration;
+
+#[derive(Copy, Clone, Debug, Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct SectionId(pub crate::model::SectionId);
+
+impl SectionId {
+    fn get_section(self, sections: &Sections) -> Result<SectionRef, RequestError> {
+        sections.get(&self.0).cloned().ok_or_else(|| {
+            RequestError::with_name(ErrorCode::NotFound, "section not found", "section")
+        })
+    }
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RunSectionRequest {
+    pub section_id: SectionId,
+    #[serde(with = "crate::serde::duration")]
+    pub duration: Duration,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RunSectionResponse {
+    pub message: String,
+    pub run_id: SectionRunHandle,
+}
+
+impl IRequest for RunSectionRequest {
+    type Response = RunSectionResponse;
+    fn exec(&mut self, ctx: &mut RequestContext) -> RequestFuture<Self::Response> {
+        let mut section_runner = ctx.section_runner.clone();
+        let section = self.section_id.get_section(&ctx.sections);
+        let duration = self.duration;
+        Box::pin(async move {
+            let section = section?;
+            let handle = section_runner
+                .queue_run(section.clone(), duration)
+                .await
+                .wrap_err("could not queue run")?;
+            Ok(RunSectionResponse {
+                message: format!("running section '{}' for {:?}", &section.name, duration),
+                run_id: handle,
+            })
+        })
+    }
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CancelSectionRequest {
+    pub section_id: SectionId,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CancelSectionResponse {
+    pub message: String,
+    pub cancelled: usize,
+}
+
+impl IRequest for CancelSectionRequest {
+    type Response = CancelSectionResponse;
+    fn exec(&mut self, ctx: &mut RequestContext) -> RequestFuture<Self::Response> {
+        let mut section_runner = ctx.section_runner.clone();
+        let section = self.section_id.get_section(&ctx.sections);
+        Box::pin(async move {
+            let section = section?;
+            let cancelled = section_runner
+                .cancel_by_section(section.id)
+                .await
+                .wrap_err("could not cancel section")?;
+            Ok(CancelSectionResponse {
+                message: format!(
+                    "cancelled {} runs for section '{}'",
+                    cancelled, section.name
+                ),
+                cancelled,
+            })
+        })
+    }
+}

src/section_runner.rs

@@ -1,4 +1,4 @@
-use crate::model::SectionRef;
+use crate::model::{SectionId, SectionRef};
 use crate::section_interface::SectionInterface;
 use actix::{
     Actor, ActorContext, Addr, AsyncContext, Handler, Message, MessageResult, SpawnHandle,
@@ -20,8 +20,7 @@ use tokio::{
 };
 use tracing::{debug, trace, warn};
 
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-#[derive(serde::Deserialize, serde::Serialize)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, serde::Deserialize, serde::Serialize)]
 pub struct SectionRunHandle(i32);
 
 impl SectionRunHandle {
@@ -177,19 +176,24 @@ impl SectionRunnerInner {
         }
     }
 
-    fn cancel_run(&mut self, run: &mut Arc<SecRun>) {
+    fn cancel_run(&mut self, run: &mut Arc<SecRun>) -> bool {
         let run = Arc::make_mut(run);
         if run.is_running() {
             debug!(section_id = run.section.id, "cancelling running section");
             self.interface
                 .set_section_state(run.section.interface_id, false);
         }
-        run.state = SecRunState::Cancelled;
-        self.send_event(SectionEvent::RunCancel(
-            run.handle.clone(),
-            run.section.clone(),
-        ));
-        self.did_change = true;
+        if run.state != SecRunState::Cancelled {
+            run.state = SecRunState::Cancelled;
+            self.send_event(SectionEvent::RunCancel(
+                run.handle.clone(),
+                run.section.clone(),
+            ));
+            self.did_change = true;
+            true
+        } else {
+            false
+        }
     }
 
     fn pause_run(&mut self, run: &mut Arc<SecRun>) {
@@ -322,40 +326,78 @@ impl Handler<QueueRun> for SectionRunnerActor {
 }
 
 #[derive(Message, Debug, Clone)]
-#[rtype(result = "()")]
+#[rtype(result = "bool")]
 struct CancelRun(SectionRunHandle);
 
 impl Handler<CancelRun> for SectionRunnerActor {
-    type Result = ();
+    type Result = bool;
 
     fn handle(&mut self, msg: CancelRun, ctx: &mut Self::Context) -> Self::Result {
         let CancelRun(handle) = msg;
-        for run in self.state.run_queue.iter_mut() {
-            if run.handle != handle {
-                continue;
-            }
+        let mut cancelled = false;
+        for run in self
+            .state
+            .run_queue
+            .iter_mut()
+            .filter(|run| run.handle == handle)
+        {
             trace!(handle = handle.0, "cancelling run by handle");
-            self.inner.cancel_run(run);
+            cancelled = self.inner.cancel_run(run);
         }
         ctx.notify(Process);
+        cancelled
     }
 }
 
 #[derive(Message, Debug, Clone)]
-#[rtype(result = "()")]
+#[rtype(result = "usize")]
+struct CancelBySection(SectionId);
+
+impl Handler<CancelBySection> for SectionRunnerActor {
+    type Result = usize;
+
+    fn handle(&mut self, msg: CancelBySection, ctx: &mut Self::Context) -> Self::Result {
+        let CancelBySection(section_id) = msg;
+        let mut count = 0_usize;
+        for run in self
+            .state
+            .run_queue
+            .iter_mut()
+            .filter(|run| run.section.id == section_id)
+        {
+            trace!(
+                handle = run.handle.0,
+                section_id,
+                "cancelling run by section"
+            );
+            if self.inner.cancel_run(run) {
+                count += 1;
+            }
+        }
+        ctx.notify(Process);
+        count
+    }
+}
+
+#[derive(Message, Debug, Clone)]
+#[rtype(result = "usize")]
 struct CancelAll;
 
 impl Handler<CancelAll> for SectionRunnerActor {
-    type Result = ();
+    type Result = usize;
 
     fn handle(&mut self, _msg: CancelAll, ctx: &mut Self::Context) -> Self::Result {
         let mut old_runs = SecRunQueue::new();
         swap(&mut old_runs, &mut self.state.run_queue);
         trace!(count = old_runs.len(), "cancelling all runs");
+        let mut count = 0usize;
         for mut run in old_runs {
-            self.inner.cancel_run(&mut run);
+            if self.inner.cancel_run(&mut run) {
+                count += 1;
+            }
         }
         ctx.notify(Process);
+        count
     }
 }
 
@@ -517,11 +559,7 @@ impl SectionRunner {
         (QueueRun(handle.clone(), section, duration), handle)
     }
 
-    pub fn do_queue_run(
-        &mut self,
-        section: SectionRef,
-        duration: Duration,
-    ) -> SectionRunHandle {
+    pub fn do_queue_run(&mut self, section: SectionRef, duration: Duration) -> SectionRunHandle {
         let (queue_run, handle) = self.queue_run_inner(section, duration);
         self.addr.do_send(queue_run);
         handle
@@ -543,11 +581,20 @@ impl SectionRunner {
         self.addr.do_send(CancelRun(handle))
     }
 
-    pub fn cancel_run(&mut self, handle: SectionRunHandle) -> impl Future<Output = Result<()>> {
+    pub fn cancel_run(&mut self, handle: SectionRunHandle) -> impl Future<Output = Result<bool>> {
         self.addr.send(CancelRun(handle)).map_err(From::from)
     }
 
-    pub fn cancel_all(&mut self) -> impl Future<Output = Result<()>> {
+    pub fn cancel_by_section(
+        &mut self,
+        section_id: SectionId,
+    ) -> impl Future<Output = Result<usize>> {
+        self.addr
+            .send(CancelBySection(section_id))
+            .map_err(From::from)
+    }
+
+    pub fn cancel_all(&mut self) -> impl Future<Output = Result<usize>> {
         self.addr.send(CancelAll).map_err(From::from)
     }