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Merge branch 'feature/mqtt-rework' into feature/telemetry

This commit is contained in:
Ryan Summers 2021-05-04 18:19:38 +02:00
parent b35250efbf a3ff8aae75
commit 5767973548
6 changed files with 150 additions and 200 deletions
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72
miniconf.py
View File

@ -10,6 +10,7 @@ import asyncio
import json
import logging
import sys
import uuid
from gmqtt import Client as MqttClient
@ -33,28 +34,52 @@ class Miniconf:
client: A connected MQTT5 client.
prefix: The MQTT toptic prefix of the device to control.
"""
self.uuid = uuid.uuid1(prefix)
self.request_id = 0
self.client = client
self.prefix = prefix
self.inflight = {}
self.client.on_message = self._handle_response
self.client.subscribe(f'{prefix}/response/#')
def _handle_response(self, _client, topic, payload, *_args, **_kwargs):
def _handle_response(self, _client, _topic, payload, _qos, properties):
"""Callback function for when messages are received over MQTT.
Args:
_client: The MQTT client.
topic: The topic that the message was received on.
_topic: The topic that the message was received on.
payload: The payload of the message.
_qos: The quality-of-service level of the received packet
properties: A dictionary of properties associated with the message.
"""
if topic not in self.inflight:
# TODO use correlation_data to distinguish clients and requests
logger.warning('Unexpected response on topic: %s', topic)
# Extract corrleation data from the properties
try:
correlation_data = json.loads(properties['correlation_data'])
except (json.decoder.JSONDecodeError, KeyError):
logger.warning('Ignoring message with invalid correlation data')
return
# Validate the correlation data.
try:
if correlation_data['id'] != self.uuid.hex:
logger.info('Ignoring correlation data for different ID')
return
pid = correlation_data['pid']
except KeyError:
logger.warning('Ignoring unknown correlation data: %s', correlation_data)
return
if pid not in self.inflight:
logger.warning('Unexpected pid: %s', pid)
return
try:
response = json.loads(payload)
self.inflight[topic].set_result((response['code'], response['msg']))
del self.inflight[topic]
self.inflight[pid].set_result((response['code'], response['msg']))
del self.inflight[pid]
except json.decoder.JSONDecodeError:
logger.warning('Invalid response format: %s', payload)
async def command(self, path, value):
"""Write the provided data to the specified path.
@ -69,21 +94,30 @@ class Miniconf:
"""
setting_topic = f'{self.prefix}/settings/{path}'
response_topic = f'{self.prefix}/response/{path}'
if response_topic in self.inflight:
# TODO use correlation_data to distinguish clients and requests
raise NotImplementedError(
'Only one in-flight message per topic is supported')
# Assign a unique identifier to this update request.
pid = self.request_id
self.request_id += 1
assert pid not in self.inflight, 'Invalid PID encountered'
correlation_data = json.dumps({
'id': self.uuid.hex,
'pid': pid,
})
value = json.dumps(value)
logger.info('Sending %s to "%s"', value, setting_topic)
fut = asyncio.get_running_loop().create_future()
self.inflight[response_topic] = fut
self.inflight[pid] = fut
self.client.publish(setting_topic, payload=value, qos=0, retain=True,
response_topic=response_topic)
response_topic=response_topic,
correlation_data=correlation_data)
return await fut
def main():
""" Main program entry point. """
parser = argparse.ArgumentParser(
description='Miniconf command line interface.',
formatter_class=argparse.RawDescriptionHelpFormatter,
@ -110,15 +144,13 @@ def main():
async def configure_settings():
interface = await Miniconf.create(args.prefix, args.broker)
failures = 0
for kv in args.settings:
path, value = kv.split("=", 1)
for key_value in args.settings:
path, value = key_value.split("=", 1)
code, response = await interface.command(path, json.loads(value))
print(response)
print(f'{path}: {response}')
if code != 0:
failures += 1
return failures
return code
return 0
sys.exit(loop.run_until_complete(configure_settings()))

2
src/bin/dual-iir.rs
View File

@ -185,7 +185,7 @@ const APP: () = {
fn settings_update(mut c: settings_update::Context) {
// Update the IIR channels.
let settings = c.resources.mqtt.settings();
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.rs
View File

@ -231,7 +231,7 @@ 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(priority = 1, resources=[mqtt, digital_inputs, settings, telemetry], schedule=[telemetry])]

57
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");
}
Self {
msg,
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,
}
}
},
/// 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");
}
Err(error) => {
let mut msg = String::new();
if write!(&mut msg, "{:?}", error).is_err() {
msg = String::from("Miniconf Error");
}
Self {
code: SettingsResponseCode::MiniconfError as u8,
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;
mod telemetry;

177
src/net/mqtt_interface.rs
View File

@ -2,27 +2,23 @@ use crate::hardware::{
design_parameters::MQTT_BROKER, CycleCounter, EthernetPhy, NetworkStack,
};
use core::{cell::RefCell, 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 +40,22 @@ 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::from(prefix);
response_topic.push_str("/log").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::from(prefix);
settings_prefix.push_str("/settings").unwrap();
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 +68,7 @@ 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) => {
@ -88,18 +79,19 @@ where
// If the PHY indicates there's no more ethernet link, reset the DHCP server in the network
// stack.
if self.phy.poll_link() == false {
match self.phy.poll_link() {
true => self.network_was_reset = false,
// Only reset the network stack once per link reconnection. This prevents us from
// sending an excessive number of DHCP requests.
if !self.network_was_reset {
false if !self.network_was_reset => {
self.network_was_reset = true;
self.mqtt.borrow_mut().network_stack.handle_link_reset();
}
} else {
self.network_was_reset = false;
self.mqtt.network_stack.handle_link_reset();
}
_ => {},
};
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 +109,61 @@ 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);
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,
// TODO: When Minimq supports more QoS levels, this should be increased to
// ensure that the client has received it at least once.
minimq::QoS::AtMostOnce,
&response.properties,
)
.ok();
update = settings_update;
},
) {
}) {
// If settings updated,
Ok(_) => {
if update {
@ -170,75 +189,7 @@ 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)
}
/// Publish telemetry to the default telemetry topic.
///
/// # Note
/// Telemetry is transmitted in a "best-effort" manner. There is no guarantee it will be
/// transmitted.
///
/// # Args
/// * `telemetry` - The telemetry message to transmit.
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();
}
/// Get a copy of the current settings.
pub fn settings(&self) -> S {
self.settings.borrow().clone()
pub fn settings(&self) -> &S {
&self.settings
}
}