Actuator draft that is actually implementable

Cargo.toml

@@ -32,7 +32,8 @@ uuid = { version = "0.8", features = ["serde", "v4"] }
 
 clap = "2.33"
 
-#rsasl = "0.1"
+# TODO update this if bindgen breaks (again)
+rsasl = "0.1.2"
 
 # rumqtt needs tokio which I'm trying to get away from
 paho-mqtt = { git = "https://github.com/dequbed/paho.mqtt.rust.git", branch = "master", features = ["build_bindgen"] }
@@ -42,5 +43,7 @@ paho-mqtt = { git = "https://github.com/dequbed/paho.mqtt.rust.git", branch = "m
 libc = "0.2"
 lmdb-rkv = "0.14"
 
+async-trait = "0.1"
+
 [build-dependencies]
 capnpc = "0.13"

src/config.rs

@@ -24,6 +24,7 @@ pub struct Config {
     pub passdb: PathBuf,
     pub(crate) access: Access,
     pub listen: Box<[Listen]>,
+    pub mqtt_url: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -56,6 +57,7 @@ impl Default for Config {
                     address: "::1".to_string(),
                     port: Some(DEFAULT_PORT)
             }]),
+            mqtt_url: "127.0.0.1:1883".to_string(),
         }
     }
 }

src/error.rs

@@ -7,6 +7,8 @@ use rsasl::SaslError;
 // SpawnError is a somewhat ambigous name, `use as` to make it futures::SpawnError instead.
 use futures::task as futures;
 
+use paho_mqtt::errors as mqtt;
+
 #[derive(Debug)]
 pub enum Error {
     TomlDe(toml::de::Error),
@@ -19,6 +21,7 @@ pub enum Error {
     FlexbuffersDe(flexbuffers::DeserializationError),
     FlexbuffersSer(flexbuffers::SerializationError),
     FuturesSpawn(futures::SpawnError),
+    MQTT(mqtt::Error),
 }
 
 impl fmt::Display for Error {
@@ -54,6 +57,9 @@ impl fmt::Display for Error {
             Error::FuturesSpawn(e) => {
                 write!(f, "Future could not be spawned: {}", e)
             },
+            Error::MQTT(e) => {
+                write!(f, "Paho MQTT encountered an error: {}", e)
+            },
         }
     }
 }
@@ -118,4 +124,10 @@ impl From<futures::SpawnError> for Error {
     }
 }
 
+impl From<mqtt::Error> for Error {
+    fn from(e: mqtt::Error) -> Error {
+        Error::MQTT(e)
+    }
+}
+
 pub(crate) type Result<T> = std::result::Result<T, Error>;

src/main.rs

@@ -4,6 +4,9 @@ extern crate slog;
 #[macro_use]
 extern crate capnp_rpc;
 
+#[macro_use]
+extern crate async_trait;
+
 mod auth;
 mod access;
 mod modules;
@@ -38,6 +41,8 @@ use lmdb::Transaction;
 
 use error::Error;
 
+use registries::Registries;
+
 const LMDB_MAX_DB: u32 = 16;
 
 // Returning a `Result` from `main` allows us to use the `?` shorthand.
@@ -222,7 +227,8 @@ fn main() -> Result<(), Error> {
     // FIXME: implement notification so the modules can shut down cleanly instead of being killed
     // without warning.
     let modlog = log.clone();
-    match modules::init(modlog.new(o!("system" => "modules")), &config, &pool) {
+    let regs = Registries::new();
+    match modules::init(modlog.new(o!("system" => "modules")), &config, &local_spawn, regs) {
         Ok(()) => {}
         Err(e) => {
             error!(modlog, "Module startup failed: {}", e);

src/modules.rs

@@ -10,15 +10,16 @@ use slog::Logger;
 mod shelly;
 
 use futures::prelude::*;
-use futures::task::Spawn;
+use futures::task::LocalSpawn;
 
 use crate::config::Config;
 use crate::error::Result;
+use crate::registries::Registries;
 
 // spawner is a type that allows 'tasks' to be spawned on it, running them to completion.
-pub fn init<S: Spawn>(log: Logger, config: &Config, spawner: &S) -> Result<()> {
-    let f = Box::new(shelly::init(log.clone(), config.clone()));
-    spawner.spawn_obj(f.into())?;
+pub fn init<S: LocalSpawn>(log: Logger, config: &Config, spawner: &S, registries: Registries) -> Result<()> {
+    let f = Box::new(shelly::run(log.clone(), config.clone(), registries.clone()));
+    spawner.spawn_local_obj(f.into())?;
 
     Ok(())
 }

src/modules/shelly.rs

@@ -1,10 +1,30 @@
 use slog::Logger;
+
 use crate::config::Config;
+use crate::registries::{Registries, Actuator, ActBox};
+use crate::error::Result;
 
-use crate::registries::Actuator;
+use std::pin::Pin;
+use futures::prelude::*;
+use futures::ready;
+use futures::task::{Poll, Context};
 
-pub async fn init(log: Logger, config: Config) {
-    info!(log, "This is where shelly support would start up, IF IT WAS IMPLEMENTED");
+use paho_mqtt as mqtt;
+
+// TODO: Late config parsing. Right now the config is validated at the very startup in its
+// entirety. This works reasonably enough for this static modules here but if we do dynamic loading
+// via dlopen(), lua API, python API etc it will not.
+pub async fn run(log: Logger, config: Config, registries: Registries) {
+    let shelly_r = Shelly::new(config).await;
+    if let Err(e) = shelly_r {
+        error!(log, "Shelly module errored: {}", e);
+        return;
+    }
+
+    let r = registries.actuators.register(
+        "shelly".to_string(), 
+        shelly_r.unwrap()
+    ).await;
 }
 
 /// An actuator for all Shellies connected listening on one MQTT broker
@@ -12,9 +32,31 @@ pub async fn init(log: Logger, config: Config) {
 /// This actuator can power toggle an arbitrariy named shelly on the broker it is connected to. If
 /// you need to toggle shellies on multiple brokers you need multiple instanced of this actuator.
 struct Shelly {
-    
+    client: mqtt::AsyncClient,
 }
 
+impl Shelly {
+    pub async fn new(config: Config) -> Result<ActBox> {
+        let client = mqtt::AsyncClient::new(config.mqtt_url)?;
+
+        client.connect(mqtt::ConnectOptions::new()).await?;
+
+        Ok(Box::new(Shelly { client }) as ActBox)
+    }
+}
+
+
+#[async_trait]
 impl Actuator for Shelly {
+    async fn power_on(&mut self, name: String) {
+        let topic = "";
+        let msg = mqtt::Message::new(topic, "1", 0);
+        self.client.publish(msg).map(|_| ()).await
+    }
 
+    async fn power_off(&mut self, name: String) {
+        let topic = "";
+        let msg = mqtt::Message::new(topic, "0", 0);
+        self.client.publish(msg).map(|_| ()).await
+    }
 }

src/registries.rs

@@ -1,6 +1,6 @@
 mod actuators;
 
-pub use actuators::Actuator;
+pub use actuators::{Actuator, ActBox};
 
 #[derive(Clone)]
 /// BFFH registries
@@ -8,5 +8,13 @@ pub use actuators::Actuator;
 /// This struct is only a reference to the underlying registries - cloning it will generate a new
 /// reference, not clone the registries
 pub struct Registries {
-    actuators: actuators::Actuators,
+    pub actuators: actuators::Actuators,
+}
+
+impl Registries {
+    pub fn new() -> Self {
+        Registries {
+            actuators: actuators::Actuators::new()
+        }
+    }
 }

src/registries/actuators.rs

@@ -10,10 +10,9 @@ pub struct Actuators {
     inner: Arc<RwLock<Inner>>,
 }
 
-type ActBox = Box<dyn Actuator
-            < PowerOnFut = Future<Output = ()>
-            , PowerOffFut = Future<Output = ()>
-            >>;
+unsafe impl Send for Actuators { }
+
+pub type ActBox = Box<dyn Actuator>;
 
 type Inner = HashMap<String, ActBox>;
 
@@ -32,47 +31,23 @@ impl Actuators {
 }
 
 
+#[async_trait]
 pub trait Actuator {
     // TODO: Is it smarter to pass a (reference to?) a machine instead of 'name'? Do we need to
     // pass basically arbitrary parameters to the Actuator?
-    type PowerOnFut: Future<Output = ()>;
-    fn power_on(&mut self, name: String) -> Self::PowerOnFut;
-
-    type PowerOffFut: Future<Output = ()>;
-    fn power_off(&mut self, name: String) -> Self::PowerOffFut;
+    async fn power_on(&mut self, name: String);
+    async fn power_off(&mut self, name: String);
 }
 
 // This is merely a proof that Actuator *can* be implemented on a finite, known type. Yay for type
 // systems with halting problems.
 struct Dummy;
+#[async_trait]
 impl Actuator for Dummy {
-    type PowerOnFut = DummyPowerOnFut;
-    type PowerOffFut = DummyPowerOffFut;
-
-    fn power_on(&mut self) -> DummyPowerOnFut {
-        DummyPowerOnFut
+    async fn power_on(&mut self, _name: String) {
+        return
     }
-    fn power_off(&mut self) -> DummyPowerOffFut {
-        DummyPowerOffFut
-    }
-}
-
-use std::pin::Pin;
-use futures::task::{Poll, Context};
-
-struct DummyPowerOnFut;
-impl Future for DummyPowerOnFut {
-    type Output = ();
-
-    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
-        Poll::Ready(())
-    }
-}
-struct DummyPowerOffFut;
-impl Future for DummyPowerOffFut {
-    type Output = ();
-
-    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
-        Poll::Ready(())
+    async fn power_off(&mut self, _name: String) {
+        return
     }
 }