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-rw-r--r--src/autodiscovery.rs110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/autodiscovery.rs b/src/autodiscovery.rs
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+++ b/src/autodiscovery.rs
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+//! Fetch autodiscoverd IP addresses stored by Diplonat into Consul
+
+use std::collections::HashMap;
+use std::net::{Ipv4Addr, Ipv6Addr};
+use std::sync::Arc;
+use std::time::{Duration, SystemTime};
+
+use anyhow::{anyhow, bail, Result};
+use regex::Regex;
+use serde::{Deserialize, Serialize};
+use tokio::{select, sync::watch};
+use tracing::*;
+
+use df_consul::*;
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct DiplonatAutodiscoveryResult<A> {
+ pub timestamp: u64,
+ pub address: Option<A>,
+}
+
+#[derive(Default, Debug)]
+pub struct AutodiscoveredAddresses {
+ pub ipv4: HashMap<String, DiplonatAutodiscoveryResult<Ipv4Addr>>,
+ pub ipv6: HashMap<String, DiplonatAutodiscoveryResult<Ipv6Addr>>,
+}
+
+pub fn watch_autodiscovered_ips(
+ consul: Consul,
+ mut must_exit: watch::Receiver<bool>,
+) -> watch::Receiver<Arc<AutodiscoveredAddresses>> {
+ let (tx, rx) = watch::channel(Arc::new(AutodiscoveredAddresses::default()));
+
+ tokio::spawn(async move {
+ let mut last_index = None;
+ let re = Regex::new(r".*autodiscovery/(\w+)/(\w+)$").unwrap();
+
+ while !*must_exit.borrow() {
+ let r = select! {
+ _ = must_exit.changed() => continue,
+ r = consul.kv_get_prefix("diplonat/autodiscovery/", last_index) => r,
+ };
+
+ let entries = match r {
+ Err(e) => {
+ warn!("Error fetching diplonat autodiscovery consul prefix: {}", e);
+ tokio::time::sleep(Duration::from_secs(30)).await;
+ continue;
+ }
+ Ok(r) => {
+ last_index = Some(r.index());
+ r.into_inner()
+ }
+ };
+
+ let mut addresses = AutodiscoveredAddresses::default();
+
+ for (k, v) in entries {
+ if let Err(e) = parse_autodiscovered_address(&re, &mut addresses, &k, &v) {
+ warn!(
+ "Invalid k/v pair in diplonat autodiscovery results: {} = {} ({})",
+ k,
+ std::str::from_utf8(&v).unwrap_or("<???>"),
+ e
+ );
+ }
+ }
+
+ if tx.send(Arc::new(addresses)).is_err() {
+ info!("Autodiscovered addresses watcher terminating");
+ }
+ }
+ });
+
+ rx
+}
+
+fn parse_autodiscovered_address(
+ re: &Regex,
+ addresses: &mut AutodiscoveredAddresses,
+ k: &str,
+ v: &[u8],
+) -> Result<()> {
+ let caps = re.captures(k).ok_or(anyhow!("key does not match regex"))?;
+
+ if let (Some(family), Some(node)) = (caps.get(1), caps.get(2)) {
+ match family.as_str() {
+ "ipv4" => {
+ let r: DiplonatAutodiscoveryResult<Ipv4Addr> = serde_json::from_slice(v)?;
+ addresses.ipv4.insert(node.as_str().to_string(), r);
+ }
+ "ipv6" => {
+ let r: DiplonatAutodiscoveryResult<Ipv6Addr> = serde_json::from_slice(v)?;
+ addresses.ipv6.insert(node.as_str().to_string(), r);
+ }
+ _ => bail!("invalid address family {}", family.as_str()),
+ }
+ } else {
+ bail!("invalid regex captures {:?}", caps);
+ }
+
+ Ok(())
+}
+
+pub fn timestamp() -> u64 {
+ SystemTime::now()
+ .duration_since(SystemTime::UNIX_EPOCH)
+ .expect("clock error")
+ .as_secs()
+}