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+[dependencies] +backoff = { version = "0.4.0", features = ["tokio"] } +bytes = "1.10.1" +config = "0.15.9" +env_logger = "0.11.6" +itertools = "0.14.0" +json = "0.12.4" +log = "0.4.26" +metrics = "0.24.1" +metrics-exporter-prometheus = "0.16.2" +metrics-util = "0.19.0" +regex = "1.11.1" +rumqttc = "0.24.0" +serde = { version = "1.0.218", features = ["derive"] } +serde_regex = "1.1.0" +tokio = { version = "1.44.0", features = ["net", "rt-multi-thread"] } +tokio-util = { version = "0.7.13", features = ["codec"] } diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..991dbb0 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,317 @@ +use backoff::{backoff::Backoff, ExponentialBackoff}; +use config::Config; +use core::str; +use itertools::Itertools; +use json::JsonValue; +use log::{debug, error, info, warn}; +use metrics::gauge; +use metrics_exporter_prometheus::PrometheusBuilder; +use metrics_util::{ + registry::{AtomicStorage, GenerationalAtomicStorage, Registry}, + MetricKindMask, +}; +use regex::Regex; +use rumqttc::{ + tokio_rustls::client, + AsyncClient, + Event::{self, Incoming}, + MqttOptions, Packet, Publish, QoS, +}; +use serde::Deserialize; +use std::{collections::HashMap, error::Error, iter::repeat, process::exit, time::Duration}; +use tokio::{join, net::TcpStream}; + +struct ConfigDefaults; +impl ConfigDefaults { + fn address() -> String { + "localhost".to_owned() + } + fn port() -> u16 { + 1883 + } + fn topic() -> Vec { + vec!["#".to_owned()] + } + fn keepalive() -> u64 { + 60 + } + fn client_id() -> String { + "mqtt-exporter-rs".to_owned() + } + fn expose_client_id() -> bool { + true + } + fn zwave_topic_prefix() -> String { + "zwave/".to_owned() + } +} + +#[derive(Debug, Deserialize)] +struct AppConfig { + #[serde(default = "ConfigDefaults::address")] + address: String, + #[serde(default = "ConfigDefaults::port")] + port: u16, + #[serde(default = "ConfigDefaults::topic")] + topic: Vec, + #[serde(default = "ConfigDefaults::keepalive")] + keepalive: u64, + #[serde(default)] + username: Option, + #[serde(default)] + password: Option, + #[serde(default = "ConfigDefaults::client_id")] + client_id: String, + #[serde(default = "ConfigDefaults::expose_client_id")] + expose_client_id: bool, + #[serde(default)] + ignored_topics: Vec, + #[serde(with = "serde_regex", default)] + ignored_topics_re: Option, + #[serde(default = "ConfigDefaults::zwave_topic_prefix")] + zwave_topic_prefix: String, +} +struct App { + config: AppConfig, +} + +impl App { + fn parse_number(v: &str) -> Option { + if let Ok(num) = v.parse::() { + Some(num) + } else if v.eq_ignore_ascii_case("on") + || v.eq_ignore_ascii_case("true") + || v.eq_ignore_ascii_case("online") + { + Some(1.0) + } else if v.eq_ignore_ascii_case("off") + || v.eq_ignore_ascii_case("false") + || v.eq_ignore_ascii_case("offline") + { + Some(0.0) + } else { + None + } + } + + fn parse_metric(value: &JsonValue) -> Option { + match value { + JsonValue::Null => None, + JsonValue::Boolean(v) => { + if *v { + Some(1.0) + } else { + Some(0.0) + } + } + JsonValue::Number(v) => Some((*v).into()), + JsonValue::Short(v) => Self::parse_number(v.as_str()), + JsonValue::String(v) => Self::parse_number(v.as_str()), + _ => None, + } + } + + fn parse_metrics( + &self, + mut data: JsonValue, + topic: &str, + original_topic: &str, + prefix: &str, + labels: &Option>, + ) { + match data { + JsonValue::Array(_) => { + for (metric, child) in data.members_mut().enumerate() { + let metric = metric.to_string(); + self.parse_metrics( + child.take(), + topic, + original_topic, + &format!("{prefix}{metric}_"), + labels, + ) + } + } + JsonValue::Object(_) => { + for (metric, child) in data.entries_mut() { + self.parse_metrics( + child.take(), + topic, + original_topic, + &format!("{prefix}_{metric}"), + labels, + ) + } + } + _ => { + if let Some(v) = Self::parse_metric(&data) { + debug!("prometheus metric: {prefix} value: {v}"); + let mut labels = if let Some(labels) = labels { + labels.clone() + } else { + Vec::new() + }; + labels.push(("topic".to_owned(), topic.to_owned())); + let owned_pfx = prefix.to_owned(); + let gauge = gauge!(owned_pfx, &labels); + gauge.set(v); + } + } + } + } + + fn topic_filter(&self, topic: &str) -> bool { + !self + .config + .ignored_topics + .iter() + .any(|pfx| topic.starts_with(pfx)) + && !self + .config + .ignored_topics_re + .as_ref() + .is_some_and(|re| re.is_match(topic)) + } + + fn deserialize_payload(payload: &[u8]) -> Result> { + Ok(json::parse(str::from_utf8(payload)?)?) + } + + fn handle_event(&self, event: &Event) { + match event { + Event::Incoming(Packet::Publish(notification)) => self.handle_publish(notification), + Event::Outgoing(_) => {} + e => debug!("Unhandled event: {:?}", e), + } + } + + fn handle_publish(&self, event: &Publish) { + match Self::deserialize_payload(&event.payload) { + Ok(parsed) => self.update_metrics(&event.topic, parsed), + Err(e) => error!("Error deserializing JSON payload: {:?}", e), + } + } + + fn update_metrics(&self, raw_topic: &str, mut data: JsonValue) { + if !&self.topic_filter(raw_topic) { + return; + } + let mut topic = raw_topic.replace('/', "_"); + + if topic.starts_with(&self.config.zwave_topic_prefix) { + (topic, data) = Self::normalize_zwave2mqtt(&topic, data); + } + + self.parse_metrics(data, &topic, &topic, "mqtt", &None); + } + + fn normalize_zwave2mqtt(topic: &str, mut data: JsonValue) -> (String, JsonValue) { + if topic.contains("node_info") || !topic.contains("endpoint_") { + return (topic.to_owned(), JsonValue::Null); + } + if !data.is_object() || !data.contains("value") { + return (topic.to_owned(), JsonValue::Null); + } + let parts = topic.split('/').collect_vec(); + if let Some((properties_index, _)) = parts + .iter() + .enumerate() + .find(|(_, v)| v.starts_with("endpoint_")) + { + let parts = topic.split('/').collect_vec(); + let topic = parts[..properties_index] + .iter() + .map(|s| s.to_lowercase()) + .join("/"); + let properties = parts[properties_index..] + .iter() + .map(|s| s.to_lowercase()) + .join("_"); + let mut value = JsonValue::new_object(); + value.insert(&properties, data.remove("value")).unwrap(); + + return (topic, value); + } else { + error!("Unable to find propreties index topic: {topic:?} value: {data:?}"); + return (topic.to_owned(), JsonValue::Null); + } + } + + async fn connection_task(self) { + let mut opts = MqttOptions::new( + &self.config.client_id, + &self.config.address, + self.config.port, + ); + opts.set_keep_alive(Duration::from_secs(self.config.keepalive)) + .set_max_packet_size(150000, 150000); + + if let (Some(username), Some(password)) = (&self.config.username, &self.config.password) { + opts.set_credentials(username, password); + } + + let (client, mut eventloop) = AsyncClient::new(opts, 10); + + for topic in &self.config.topic { + client.subscribe(topic, QoS::AtLeastOnce).await.unwrap(); + } + + let mut bo = backoff::ExponentialBackoff::default(); + + loop { + match eventloop.poll().await { + Ok(event) => { + bo.reset(); + self.handle_event(&event) + } + Err(e) => { + error!("Connection error: {}", e); + let delay = bo.next_backoff(); + match delay { + Some(delay) => { + debug!("Backing off for {}s", delay.as_secs_f32()); + tokio::time::sleep(delay).await + } + None => { + error!("Connection timed out, giving up"); + exit(-1) + } + } + } + } + } + } + async fn prom_task(&self) { + let builder = PrometheusBuilder::new() + .idle_timeout(MetricKindMask::ALL, Some(Duration::from_secs(300))); + let builder = if self.config.expose_client_id { + builder.add_global_label("client_id", &self.config.client_id) + } else { + builder + }; + builder.install().unwrap(); + } +} + +#[tokio::main] +async fn main() { + env_logger::init(); + + let config = Config::builder() + .add_source( + config::Environment::with_prefix("MQTT") + .try_parsing(true) + .list_separator(",") + .with_list_parse_key("topic") + .with_list_parse_key("ignored_topics"), + ) + .build() + .unwrap(); + let app_config = config.try_deserialize().unwrap(); + info!("Loaded config: {app_config:?}"); + + let app = App { config: app_config }; + app.prom_task().await; + let task = tokio::spawn(app.connection_task()); + task.await.unwrap(); +}