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+[package] +name = "mqtt2vl" +version = "0.1.0" +edition = "2021" + +[dependencies] +chrono = { version = "0.4.40", default-features = false, features = ["std", "now", "serde"] } +futures = "0.3.31" +paho-mqtt = { version = "0.13.2", default-features = false, features = ["ssl"] } +reqwest = { version = "0.12.15", default-features = false, features = ["http2", "stream", "native-tls", "json"] } +serde = { version = "1.0.219", features = ["derive"] } +serde_json = "1.0.140" +thiserror = "2.0.12" +tokio = { version = "1.44.2", features = ["rt", "macros", "rt-multi-thread", "signal"] } +tokio-stream = { version = "0.1.17", default-features = false, features = ["sync"] } +toml = "0.8.22" +tracing = "0.1.41" +tracing-subscriber = { version = "0.3.19", features = ["env-filter"] } diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 0000000..a1ffd27 --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1 @@ +max_width = 79 diff --git a/src/backoff.rs b/src/backoff.rs new file mode 100644 index 0000000..bb97a1a --- /dev/null +++ b/src/backoff.rs @@ -0,0 +1,47 @@ +use std::iter::Iterator; +use std::time::Duration; + +use tracing::warn; + +pub struct Backoff { + duration: Duration, + max: Duration, + min: Duration, +} + +impl Default for Backoff { + fn default() -> Self { + let min = Duration::from_millis(250); + let max = Duration::from_secs(300); + let duration = min; + Self { duration, max, min } + } +} + +impl Iterator for Backoff { + type Item = Duration; + + fn next(&mut self) -> Option { + let duration = self.duration; + self.duration = std::cmp::min(self.duration * 2, self.max); + Some(duration) + } +} + +impl Backoff { + pub fn reset(&mut self) { + self.duration = self.min; + } + + pub async fn sleep(&mut self) { + warn!( + "Retrying in {}", + if self.duration.as_secs() < 1 { + format!("{} ms", self.duration.as_millis()) + } else { + format!("{} seconds", self.duration.as_secs()) + } + ); + tokio::time::sleep(self.next().unwrap()).await; + } +} diff --git a/src/config.rs b/src/config.rs new file mode 100644 index 0000000..8b4447e --- /dev/null +++ b/src/config.rs @@ -0,0 +1,72 @@ +use std::path::{Path, PathBuf}; + +use serde::Deserialize; + +#[derive(Debug, Deserialize)] +pub struct HttpConfiguration { + pub url: String, +} + +#[derive(Debug, Deserialize)] +pub struct MqttConfiguration { + pub url: String, + #[serde(default = "default_mqtt_client_id")] + pub client_id: String, + pub ca_file: Option, + pub client_cert: Option, + pub client_key: Option, + pub username: Option, + pub password: Option, + pub password_file: Option, + pub topics: Vec, +} + +#[derive(Debug, Deserialize)] +pub struct Configuration { + pub mqtt: MqttConfiguration, + pub http: HttpConfiguration, +} + +impl Default for Configuration { + fn default() -> Self { + Configuration { + mqtt: MqttConfiguration { + url: "mqtt://127.0.0.1:1883".into(), + topics: vec!["/debug".into()], + client_id: default_mqtt_client_id(), + ca_file: None, + client_cert: None, + client_key: None, + username: None, + password: None, + password_file: None, + }, + http: HttpConfiguration { + url: "http://127.0.0.1:9428/insert/jsonline?_stream_fields=topic" + .into(), + }, + } + } +} + +impl Configuration { + pub fn from_file>( + path: P, + ) -> Result { + let content = std::fs::read_to_string(path)?; + Ok(toml::from_str(&content)?) + } +} + +fn default_mqtt_client_id() -> String { + env!("CARGO_PKG_NAME").into() +} + +#[derive(Debug, thiserror::Error)] +pub enum ConfigurationError { + #[error("Error reading file: {0}")] + Io(#[from] std::io::Error), + + #[error("Error parsing TOML: {0}")] + Toml(#[from] toml::de::Error), +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..cd20dcf --- /dev/null +++ b/src/main.rs @@ -0,0 +1,228 @@ +mod backoff; +mod config; +mod mqtt; +mod relay; + +use std::sync::Arc; +use std::time::Duration; + +use chrono::{DateTime, FixedOffset, Utc}; +use futures::stream::StreamExt; +use serde::Serialize; +use tokio::signal::unix::SignalKind; +use tokio::sync::mpsc::{self, UnboundedReceiver, UnboundedSender}; +use tokio::sync::Notify; +use tokio::task::JoinHandle; +use tracing::{debug, error, info, warn}; + +use backoff::Backoff; +use config::Configuration; +use mqtt::MqttClient; + +static USER_AGENT: &str = + concat!(env!("CARGO_PKG_NAME"), "/", env!("CARGO_PKG_VERSION")); + +#[derive(Debug, Serialize)] +struct LogRecord { + #[serde(rename = "_time")] + time: DateTime, + #[serde(rename = "_msg")] + message: String, + topic: String, +} + +impl TryFrom for LogRecord { + type Error = std::str::Utf8Error; + + fn try_from(m: paho_mqtt::Message) -> Result { + let message = std::str::from_utf8(m.payload())?.to_string(); + Ok(Self { + time: Utc::now().into(), + message, + topic: m.topic().to_string(), + }) + } +} + +async fn run_sender( + client: reqwest::Client, + url: &str, + chan: UnboundedReceiver, + notify: &Notify, +) { + let mut backoff = Backoff::default(); + let relay = relay::Relay::from(chan); + loop { + if relay.closed().await { + break; + } + let req = client + .post(url) + .header(reqwest::header::ACCEPT, "application/json") + .header(reqwest::header::CONTENT_LENGTH, "0"); + debug!("Checking HTTP connection"); + tokio::select! { + _ = notify.notified() => break, + r = req.send() => { + if let Err(e) = r { + error!("Error in HTTP request: {}", e); + tokio::select! { + _ = notify.notified() => break, + _ = backoff.sleep() => (), + } + continue; + } + backoff.reset(); + debug!("HTTP connection successful"); + } + } + let (stream, handle) = relay.new_stream(); + let stream = stream + .map(|v| serde_json::to_string(&v).map(|v| format!("{}\n", v))); + let body = reqwest::Body::wrap_stream(stream); + let req = client + .post(url) + .header(reqwest::header::CONTENT_TYPE, "application/stream+json") + .body(body); + info!("Starting HTTP sender stream"); + if let Err(e) = req.send().await { + error!("HTTP request error: {}", e); + if let Err(e) = handle.await { + error!("Error in sender: {}", e); + } + } else { + break; + } + } + info!("Channel closed, stopping HTTP sender"); +} + +async fn run_subscriber( + mut client: MqttClient, + tx: UnboundedSender, + notify: &Notify, +) { + let mut stream = client.stream().await; + + tokio::select! { + _ = notify.notified() => return, + _ = client.reconnect() => (), + }; + + loop { + tokio::select! { + _ = notify.notified() => { + info!("Stopping MQTT subscriber"); + break; + } + msg = stream.next() => { + let Some(Some(msg)) = msg else { + error!("Lost connection to MQTT broker, reconnecting"); + client.reconnect().await; + continue; + }; + if msg.retained() { + debug!("Ignoring retained message on topic {}", msg.topic()); + continue; + } + match LogRecord::try_from(msg) { + Ok(m) => { + if let Err(e) = tx.send(m) { + error!("mpsc channel error: {}", e); + break; + } + } + Err(e) => { + warn!("Ignoring non-UTF8 payload: {}", e); + } + } + } + } + } +} + +async fn start_sender( + config: &Configuration, + chan: UnboundedReceiver, + notify: Arc, +) -> Result, reqwest::Error> { + let client = reqwest::Client::builder() + .tcp_keepalive(Duration::from_secs(10)) + .user_agent(USER_AGENT) + .build()?; + let url = config.http.url.clone(); + Ok(tokio::spawn(async move { + run_sender(client, &url, chan, ¬ify).await + })) +} + +async fn start_subscriber( + config: &Configuration, + tx: UnboundedSender, + notify: Arc, +) -> Result, mqtt::MqttClientError> { + let client = MqttClient::new(config)?; + Ok(tokio::spawn(async move { + run_subscriber(client, tx, ¬ify).await + })) +} + +async fn wait_signal() -> Result<(), std::io::Error> { + let mut sigterm = tokio::signal::unix::signal(SignalKind::terminate())?; + let mut sigint = tokio::signal::unix::signal(SignalKind::interrupt())?; + tokio::select! { + _ = sigterm.recv() => debug!("Got signal SIGTERM"), + _ = sigint.recv() => debug!("Got signal SIGINT"), + }; + Ok(()) +} + +#[tokio::main] +async fn main() { + tracing_subscriber::fmt() + .with_env_filter(tracing_subscriber::EnvFilter::from_default_env()) + .with_writer(std::io::stderr) + .init(); + + let config = if let Some(arg) = std::env::args().nth(1) { + match Configuration::from_file(arg) { + Ok(c) => c, + Err(e) => { + error!("Failed to load configuration: {}", e); + std::process::exit(1); + } + } + } else { + Configuration::default() + }; + + let notify = Arc::new(Notify::new()); + let (tx, rx) = mpsc::unbounded_channel(); + let mqtt_task = match start_subscriber(&config, tx, notify.clone()).await { + Ok(h) => h, + Err(e) => { + error!("Failed to start MQTT subscriber: {}", e); + std::process::exit(1); + } + }; + let http_task = match start_sender(&config, rx, notify.clone()).await { + Ok(h) => h, + Err(e) => { + error!("Failed to start HTTP sender: {}", e); + std::process::exit(1); + } + }; + let mut rc = 0; + if let Err(e) = wait_signal().await { + error!("Error setting up signal handler: {}", e); + rc = 1; + } + notify.notify_waiters(); + if let Err(e) = mqtt_task.await { + debug!("Error in MQTT subscriber task: {}", e); + } + if let Err(e) = http_task.await { + debug!("Error in HTTP sender task: {}", e); + } + std::process::exit(rc); +} diff --git a/src/mqtt.rs b/src/mqtt.rs new file mode 100644 index 0000000..2158234 --- /dev/null +++ b/src/mqtt.rs @@ -0,0 +1,118 @@ +use std::path::PathBuf; +use std::sync::Arc; + +use paho_mqtt as mqtt; +use tokio::sync::Mutex; +use tracing::{debug, error, info}; + +use crate::backoff::Backoff; +use crate::config::Configuration; + +pub struct MqttClient { + url: String, + client: Arc>, + topics: Vec, + backoff: Backoff, + + ca_file: Option, + client_cert: Option, + client_key: Option, + username: Option, + password: Option, +} + +impl MqttClient { + pub fn new(config: &Configuration) -> Result { + let url = config.mqtt.url.clone(); + let ca_file = config.mqtt.ca_file.clone(); + let client_cert = config.mqtt.client_cert.clone(); + let client_key = config.mqtt.client_key.clone(); + let username = config.mqtt.username.clone(); + let password = if let Some(f) = &config.mqtt.password_file { + Some( + std::fs::read_to_string(f) + .map_err(MqttClientError::PasswordFile)? + .trim() + .to_owned(), + ) + } else { + config.mqtt.password.clone() + }; + let opts = mqtt::CreateOptionsBuilder::new() + .server_uri(&config.mqtt.url) + .client_id(&config.mqtt.client_id) + .finalize(); + let client = Arc::new(Mutex::new(mqtt::AsyncClient::new(opts)?)); + let topics = config.mqtt.topics.clone(); + let backoff = Backoff::default(); + Ok(Self { + url, + client, + topics, + backoff, + ca_file, + client_cert, + client_key, + username, + password, + }) + } + + pub async fn connect(&mut self) -> Result<(), mqtt::Error> { + let client = self.client.lock().await; + client.connect(self.conn_opts()?).await?; + info!("Successfully connected to MQTT broker"); + for topic in &self.topics { + debug!("Subscribing to topic: {}", topic); + client.subscribe(topic, 0).await?; + } + Ok(()) + } + + pub async fn reconnect(&mut self) { + while let Err(e) = self.connect().await { + error!("Reconnect failed: {}", e); + self.backoff.sleep().await; + } + self.backoff.reset(); + } + + pub async fn stream( + &mut self, + ) -> mqtt::AsyncReceiver> { + self.client.lock().await.get_stream(100) + } + + fn conn_opts(&self) -> Result { + let mut conn_opts = mqtt::ConnectOptionsBuilder::new(); + if self.url.starts_with("mqtts://") || self.url.starts_with("ssl://") { + let mut ssl_opts = mqtt::SslOptionsBuilder::new(); + ssl_opts.verify(true); + if let Some(ca_file) = &self.ca_file { + ssl_opts.trust_store(ca_file)?; + } + if let Some(client_cert) = &self.client_cert { + ssl_opts.key_store(client_cert)?; + } + if let Some(client_key) = &self.client_key { + ssl_opts.key_store(client_key)?; + } + let ssl_opts = ssl_opts.finalize(); + conn_opts.ssl_options(ssl_opts); + } + if let [Some(username), Some(password)] = + [&self.username, &self.password] + { + conn_opts.user_name(username).password(password); + } + Ok(conn_opts.finalize()) + } +} + +#[derive(Debug, thiserror::Error)] +pub enum MqttClientError { + #[error("MQTT client error: {0}")] + Mqtt(#[from] mqtt::Error), + #[error("Could not read password from file: {0}")] + PasswordFile(std::io::Error), +} diff --git a/src/relay.rs b/src/relay.rs new file mode 100644 index 0000000..77ccfe6 --- /dev/null +++ b/src/relay.rs @@ -0,0 +1,52 @@ +use std::sync::Arc; + +use tokio::sync::mpsc::{self, UnboundedReceiver}; +use tokio::sync::Mutex; +use tokio::task::JoinHandle; +use tokio_stream::wrappers::UnboundedReceiverStream; +use tracing::debug; + +pub struct Relay { + channel: Arc>>, +} + +impl From> for Relay { + fn from(channel: UnboundedReceiver) -> Self { + let channel = Arc::new(Mutex::new(channel)); + Self { channel } + } +} + +impl Relay { + pub async fn closed(&self) -> bool { + let chan = self.channel.lock().await; + chan.is_closed() + } + + pub fn new_stream(&self) -> (UnboundedReceiverStream, JoinHandle<()>) { + let (tx, rx) = mpsc::unbounded_channel(); + let h = tokio::spawn({ + let chan = self.channel.clone(); + async move { + let mut chan = chan.lock().await; + loop { + tokio::select! { + it = chan.recv() => { + if let Some(it) = it { + if tx.send(it).is_err() { + break; + } + } else { + debug!("Upstream channel closed"); + break + } + } + _ = tx.closed() => break, + }; + } + } + }); + + (UnboundedReceiverStream::new(rx), h) + } +}