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Refactoring MQTT architecture

This commit is contained in:
Ryan Summers 2021-05-04 13:13:44 +02:00
parent bc4fbc0e1c
commit 5c4ba78dd1
5 changed files with 86 additions and 158 deletions
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2
src/bin/dual-iir.rs
View File

@ -168,7 +168,7 @@ const APP: () = {
let settings = c.resources.mqtt.settings();
// Update the IIR channels.
c.resources.settings.lock(|current| *current = settings);
c.resources.settings.lock(|current| *current = *settings);
// Update AFEs
c.resources.afes.0.set_gain(settings.afe[0]);

2
src/bin/lockin-external.rs
View File

@ -215,7 +215,7 @@ const APP: () = {
c.resources.afes.0.set_gain(settings.afe[0]);
c.resources.afes.1.set_gain(settings.afe[1]);
c.resources.settings.lock(|current| *current = settings);
c.resources.settings.lock(|current| *current = *settings);
}
#[task(binds = ETH, priority = 1)]

67
src/net/messages.rs
View File

@ -6,10 +6,7 @@ use core::fmt::Write;
#[derive(Debug, Copy, Clone)]
pub enum SettingsResponseCode {
NoError = 0,
NoTopic = 1,
InvalidPrefix = 2,
UnknownTopic = 3,
UpdateFailure = 4,
MiniconfError = 1,
}
/// Represents a generic MQTT message.
@ -70,55 +67,25 @@ impl<'a> MqttMessage<'a> {
}
}
impl SettingsResponse {
/// Construct a settings response upon successful settings update.
///
/// # Args
/// * `path` - The path of the setting that was updated.
pub fn update_success(path: &str) -> Self {
let mut msg: String<consts::U64> = String::new();
if write!(&mut msg, "{} updated", path).is_err() {
msg = String::from("Latest update succeeded");
}
impl From<Result<(), miniconf::Error>> for SettingsResponse {
fn from(result: Result<(), miniconf::Error>) -> Self {
match result {
Ok(_) => Self {
msg: String::from("OK"),
code: SettingsResponseCode::NoError as u8,
},
Self {
msg,
code: SettingsResponseCode::NoError as u8,
}
}
Err(error) => {
let mut msg = String::new();
if write!(&mut msg, "{:?}", error).is_err() {
msg = String::from("Miniconf Error");
}
/// Construct a response when a settings update failed.
///
/// # Args
/// * `path` - The settings path that configuration failed for.
/// * `err` - The settings update error that occurred.
pub fn update_failure(path: &str, err: miniconf::Error) -> Self {
let mut msg: String<consts::U64> = String::new();
if write!(&mut msg, "{} update failed: {:?}", path, err).is_err() {
if write!(&mut msg, "Latest update failed: {:?}", err).is_err() {
msg = String::from("Latest update failed");
Self {
code: SettingsResponseCode::MiniconfError as u8,
msg,
}
}
}
Self {
msg,
code: SettingsResponseCode::UpdateFailure as u8,
}
}
/// Construct a response from a custom response code.
///
/// # Args
/// * `code` - The response code to provide.
pub fn code(code: SettingsResponseCode) -> Self {
let mut msg: String<consts::U64> = String::new();
// Note(unwrap): All code debug names shall fit in the 64 byte string.
write!(&mut msg, "{:?}", code).unwrap();
Self {
code: code as u8,
msg,
}
}
}

2
src/net/mod.rs
View File

@ -11,7 +11,7 @@ use core::fmt::Write;
mod messages;
mod mqtt_interface;
use messages::{MqttMessage, SettingsResponse, SettingsResponseCode};
use messages::{MqttMessage, SettingsResponse};
pub use mqtt_interface::MqttInterface;
/// Potential actions for firmware to take.

171
src/net/mqtt_interface.rs
View File

@ -2,27 +2,25 @@ use crate::hardware::{
design_parameters::MQTT_BROKER, CycleCounter, EthernetPhy, NetworkStack,
};
use core::{cell::RefCell, fmt::Write};
use core::fmt::Write;
use heapless::{consts, String};
use serde::Serialize;
use super::{Action, MqttMessage, SettingsResponse, SettingsResponseCode};
use super::{Action, MqttMessage, SettingsResponse};
/// MQTT settings interface.
pub struct MqttInterface<S>
where
S: miniconf::Miniconf + Default + Clone,
{
telemetry_topic: String<consts::U128>,
default_response_topic: String<consts::U128>,
mqtt: RefCell<minimq::MqttClient<minimq::consts::U256, NetworkStack>>,
settings: RefCell<S>,
mqtt: minimq::MqttClient<minimq::consts::U256, NetworkStack>,
settings: S,
clock: CycleCounter,
phy: EthernetPhy,
network_was_reset: bool,
subscribed: bool,
id: String<consts::U64>,
settings_prefix: String<consts::U64>,
}
impl<S> MqttInterface<S>
@ -44,23 +42,24 @@ where
phy: EthernetPhy,
clock: CycleCounter,
) -> Self {
let mqtt_client =
let mqtt =
minimq::MqttClient::new(MQTT_BROKER.into(), client_id, stack)
.unwrap();
let mut telemetry_topic: String<consts::U128> = String::new();
write!(&mut telemetry_topic, "{}/telemetry", prefix).unwrap();
let mut response_topic: String<consts::U128> = String::new();
write!(&mut response_topic, "{}/log", prefix).unwrap();
let mut settings_prefix: String<consts::U64> = String::new();
write!(&mut settings_prefix, "{}/settings", prefix).unwrap();
// Ensure we have two remaining spaces
Self {
mqtt: RefCell::new(mqtt_client),
settings: RefCell::new(S::default()),
id: String::from(prefix),
mqtt,
settings: S::default(),
settings_prefix,
clock,
phy,
telemetry_topic,
default_response_topic: response_topic,
network_was_reset: false,
subscribed: false,
@ -73,11 +72,7 @@ where
/// An option containing an action that should be completed as a result of network servicing.
pub fn update(&mut self) -> Option<Action> {
// First, service the network stack to process any inbound and outbound traffic.
let sleep = match self
.mqtt
.borrow_mut()
.network_stack
.poll(self.clock.current_ms())
let sleep = match self.mqtt.network_stack.poll(self.clock.current_ms())
{
Ok(updated) => !updated,
Err(err) => {
@ -93,13 +88,13 @@ where
// sending an excessive number of DHCP requests.
if !self.network_was_reset {
self.network_was_reset = true;
self.mqtt.borrow_mut().network_stack.handle_link_reset();
self.mqtt.network_stack.handle_link_reset();
}
} else {
self.network_was_reset = false;
}
let mqtt_connected = match self.mqtt.borrow_mut().is_connected() {
let mqtt_connected = match self.mqtt.is_connected() {
Ok(connected) => connected,
Err(minimq::Error::Network(
smoltcp_nal::NetworkError::NoIpAddress,
@ -117,34 +112,59 @@ where
// If we're no longer subscribed to the settings topic, but we are connected to the broker,
// resubscribe.
if !self.subscribed && mqtt_connected {
let mut settings_topic: String<consts::U128> = String::new();
write!(&mut settings_topic, "{}/settings/#", self.id.as_str())
.unwrap();
// Note(unwrap): We construct a string with two more characters than the prefix
// strucutre, so we are guaranteed to have space for storage.
let mut settings_topic: String<consts::U66> =
String::from(self.settings_prefix.as_str());
settings_topic.push_str("/#").unwrap();
self.mqtt
.borrow_mut()
.subscribe(&settings_topic, &[])
.unwrap();
self.mqtt.subscribe(&settings_topic, &[]).unwrap();
self.subscribed = true;
}
// Handle any MQTT traffic.
let settings = &mut self.settings;
let mqtt = &mut self.mqtt;
let prefix = self.settings_prefix.as_str();
let default_response_topic = self.default_response_topic.as_str();
let mut update = false;
match self.mqtt.borrow_mut().poll(
|client, topic, message, properties| {
let (response, settings_update) =
self.route_message(topic, message, properties);
client
.publish(
response.topic,
&response.message,
minimq::QoS::AtMostOnce,
&response.properties,
)
.ok();
update = settings_update;
},
) {
match mqtt.poll(|client, topic, message, properties| {
let path = match topic.strip_prefix(prefix) {
// For paths, we do not want to include the leading slash.
Some(path) => {
if path.len() > 0 {
&path[1..]
} else {
path
}
}
None => {
info!("Unexpected MQTT topic: {}", topic);
return;
}
};
let message: SettingsResponse = settings
.string_set(path.split('/').peekable(), message)
.and_then(|_| {
update = true;
Ok(())
})
.into();
let response =
MqttMessage::new(properties, default_response_topic, &message);
client
.publish(
response.topic,
&response.message,
minimq::QoS::AtMostOnce,
&response.properties,
)
.ok();
}) {
// If settings updated,
Ok(_) => {
if update {
@ -170,66 +190,7 @@ where
}
}
fn route_message<'a, 'me: 'a>(
&'me self,
topic: &str,
message: &[u8],
properties: &[minimq::Property<'a>],
) -> (MqttMessage<'a>, bool) {
let mut update = false;
let response_msg =
if let Some(path) = topic.strip_prefix(self.id.as_str()) {
let mut parts = path[1..].split('/');
match parts.next() {
Some("settings") => {
match self
.settings
.borrow_mut()
.string_set(parts.peekable(), message)
{
Ok(_) => {
update = true;
SettingsResponse::update_success(path)
}
Err(error) => {
SettingsResponse::update_failure(path, error)
}
}
}
Some(_) => SettingsResponse::code(
SettingsResponseCode::UnknownTopic,
),
_ => SettingsResponse::code(SettingsResponseCode::NoTopic),
}
} else {
SettingsResponse::code(SettingsResponseCode::InvalidPrefix)
};
let response = MqttMessage::new(
properties,
&self.default_response_topic,
&response_msg,
);
(response, update)
}
pub fn publish_telemetry(&mut self, telemetry: &impl Serialize) {
let telemetry =
miniconf::serde_json_core::to_string::<consts::U256, _>(telemetry)
.unwrap();
self.mqtt
.borrow_mut()
.publish(
&self.telemetry_topic,
telemetry.as_bytes(),
minimq::QoS::AtMostOnce,
&[],
)
.ok();
}
pub fn settings(&self) -> S {
self.settings.borrow().clone()
pub fn settings(&self) -> &S {
&self.settings
}
}