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use tokio::task::JoinHandle; |
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use tracing::info; |
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use pom::alerts::Alerter; |
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use pom::checks::dns; |
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use pom::config::Config; |
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use pom::db; |
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use super::{CheckInterval, configured_targets}; |
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pub(crate) fn spawn_dns_tasks( |
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config: &Config, |
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pool: &sqlx::SqlitePool, |
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cancel: &tokio_util::sync::CancellationToken, |
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alerter: Option<&Alerter>, |
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) -> Vec<JoinHandle<()>> { |
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let dns_interval_secs = config.serve.dns_check_interval_secs; |
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let mut handles = Vec::new(); |
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|
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for (name, target_config) in configured_targets(config) { |
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if target_config.dns.is_empty() { |
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continue; |
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} |
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let dns_records = target_config.dns.clone(); |
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let label = target_config.label.clone(); |
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let pool = pool.clone(); |
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let alerter = alerter.cloned(); |
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let cancel = cancel.clone(); |
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let n = dns_records.len(); |
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|
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info!("{name}: DNS check every {dns_interval_secs}s ({n} records)"); |
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|
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handles.push(tokio::spawn(async move { |
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let expected_dns_keys: Vec<(String, String)> = dns_records |
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.iter() |
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.map(|d| (d.name.clone(), d.record_type.to_string())) |
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.collect(); |
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match db::prune_stale_dns(&pool, &name, &expected_dns_keys).await { |
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Ok(0) => {} |
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Ok(n) => info!("{name}: pruned {n} stale DNS check rows"), |
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Err(e) => tracing::error!("{name}: failed to prune stale DNS: {e}"), |
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} |
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|
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let mut ticks = CheckInterval::new(dns_interval_secs, cancel); |
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let mut prev_mismatched: std::collections::HashSet<( |
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String, |
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pom::types::DnsRecordType, |
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)> = std::collections::HashSet::new(); |
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|
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while ticks.next().await { |
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let results = dns::check_dns(&name, &dns_records).await; |
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|
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for result in &results { |
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if let Err(e) = db::insert_dns_check(&pool, result).await { |
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tracing::error!( |
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"{}: failed to store DNS check for {} {}: {e}", |
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name, |
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result.name, |
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result.record_type |
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); |
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} |
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} |
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|
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let current_mismatched: std::collections::HashSet<( |
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String, |
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pom::types::DnsRecordType, |
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)> = results |
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.iter() |
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.filter(|r| !r.matches) |
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.map(|r| (r.name.clone(), r.record_type)) |
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.collect(); |
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|
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let ok_count = results.iter().filter(|r| r.matches).count(); |
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info!("{name}: DNS {ok_count}/{n} match"); |
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|
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if let Some(ref alerter) = alerter { |
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|
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let new_mismatches: Vec<&pom::types::DnsCheckResult> = results |
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.iter() |
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.filter(|r| { |
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!r.matches |
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&& !prev_mismatched.contains(&(r.name.clone(), r.record_type)) |
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}) |
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.collect(); |
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if !new_mismatches.is_empty() { |
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let owned: Vec<pom::types::DnsCheckResult> = |
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new_mismatches.into_iter().cloned().collect(); |
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alerter.send_dns_mismatch_alert(&name, &label, &owned).await; |
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} |
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|
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|
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if !prev_mismatched.is_empty() && current_mismatched.is_empty() { |
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alerter.send_dns_recovery_alert(&name, &label).await; |
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} |
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} |
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|
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prev_mismatched = current_mismatched; |
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} |
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})); |
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} |
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|
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handles |
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} |
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|