169 lines
4.9 KiB
Rust
169 lines
4.9 KiB
Rust
use std::collections::{HashMap, HashSet};
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use std::fmt;
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use std::sync::Arc;
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use std::time::Duration;
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use tokio::{select, sync::watch};
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use tracing::*;
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use df_consul::*;
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const IPV4_TARGET_METADATA_TAG: &str = "public_ipv4";
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const IPV6_TARGET_METADATA_TAG: &str = "public_ipv6";
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const CNAME_TARGET_METADATA_TAG: &str = "cname_target";
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// ---- Extract DNS config from Consul catalog ----
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#[derive(Debug, Eq, PartialEq, Default)]
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pub struct DnsConfig {
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pub entries: HashMap<DnsEntryKey, DnsEntryValue>,
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}
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#[derive(Clone, Debug, Hash, PartialEq, Eq)]
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pub struct DnsEntryKey {
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pub dns_path: String,
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pub record_type: DnsRecordType,
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}
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#[derive(Debug, PartialEq, Eq)]
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pub struct DnsEntryValue {
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pub targets: HashSet<String>,
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}
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#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
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#[allow(clippy::upper_case_acronyms)]
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pub enum DnsRecordType {
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A,
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AAAA,
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CNAME,
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}
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impl DnsConfig {
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pub fn new() -> Self {
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Self {
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entries: HashMap::new(),
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}
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}
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fn add(&mut self, k: DnsEntryKey, v: DnsEntryValue) {
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if let Some(ent) = self.entries.get_mut(&k) {
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ent.targets.extend(v.targets);
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} else {
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self.entries.insert(k, v);
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}
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}
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}
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fn parse_d53_tag(tag: &str, node: &catalog::Node) -> Option<(DnsEntryKey, DnsEntryValue)> {
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let splits = tag.split(' ').collect::<Vec<_>>();
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if splits.len() != 2 {
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return None;
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}
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let (record_type, targets) = match splits[0] {
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"d53-a" => match node.meta.get(IPV4_TARGET_METADATA_TAG) {
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Some(tgt) => (DnsRecordType::A, [tgt.to_string()].into_iter().collect()),
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None => {
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warn!("Got d53-a tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, IPV4_TARGET_METADATA_TAG);
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return None;
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}
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},
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"d53-aaaa" => match node.meta.get(IPV6_TARGET_METADATA_TAG) {
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Some(tgt) => (DnsRecordType::AAAA, [tgt.to_string()].into_iter().collect()),
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None => {
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warn!("Got d53-aaaa tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, IPV6_TARGET_METADATA_TAG);
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return None;
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}
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},
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"d53-cname" => match node.meta.get(CNAME_TARGET_METADATA_TAG) {
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Some(tgt) => (
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DnsRecordType::CNAME,
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[tgt.to_string()].into_iter().collect(),
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),
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None => {
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warn!("Got d53-cname tag `{}` but node {} does not have a {} metadata value. Tag is ignored.", tag, node.node, CNAME_TARGET_METADATA_TAG);
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return None;
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}
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},
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_ => return None,
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};
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Some((
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DnsEntryKey {
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dns_path: splits[1].to_string(),
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record_type,
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},
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DnsEntryValue { targets },
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))
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}
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pub fn spawn_dns_config_task(
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consul: &Consul,
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mut must_exit: watch::Receiver<bool>,
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) -> watch::Receiver<Arc<DnsConfig>> {
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let (tx, rx) = watch::channel(Arc::new(DnsConfig::new()));
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let mut catalog_rx = consul.watch_all_service_health(Duration::from_secs(60));
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tokio::spawn(async move {
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while !*must_exit.borrow() {
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select! {
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_ = catalog_rx.changed() => (),
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_ = must_exit.changed() => continue,
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};
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let services = catalog_rx.borrow_and_update();
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let mut dns_config = DnsConfig::new();
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for (_svc, nodes) in services.iter() {
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for node in nodes.iter() {
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// Do not take into account backends if any have status critical
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if node.checks.iter().any(|x| x.status == "critical") {
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continue;
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}
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for tag in node.service.tags.iter() {
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if let Some((k, v)) = parse_d53_tag(tag, &node.node) {
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dns_config.add(k, v);
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}
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}
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}
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}
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tx.send(Arc::new(dns_config)).expect("Internal error");
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}
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});
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rx
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}
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// ---- Display impls ----
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impl std::fmt::Display for DnsRecordType {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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DnsRecordType::A => write!(f, "A"),
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DnsRecordType::AAAA => write!(f, "AAAA"),
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DnsRecordType::CNAME => write!(f, "CNAME"),
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}
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}
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}
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impl std::fmt::Display for DnsEntryKey {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{} IN {}", self.dns_path, self.record_type)
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}
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}
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impl std::fmt::Display for DnsEntryValue {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "[")?;
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for (i, tgt) in self.targets.iter().enumerate() {
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if i > 0 {
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write!(f, " ")?;
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}
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write!(f, "{}", tgt)?;
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}
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write!(f, "]")
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}
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}
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