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Retry DNS resolution on failure (#1762) 

Otherwise, a transient DNS failure makes the node hang.
This commit is contained in:
teor 2021-02-18 07:09:02 +10:00 committed by GitHub
parent 86169f6412
commit 579bd4a368
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1 changed files with 20 additions and 14 deletions
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34
zebra-network/src/config.rs
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@ -38,21 +38,27 @@ impl Config {
/// If DNS resolution fails or times out for all peers, returns an empty list.
async fn parse_peers(peers: &HashSet<String>) -> HashSet<SocketAddr> {
use futures::stream::StreamExt;
let peer_addresses = peers
.iter()
.map(|s| Config::resolve_host(s))
.collect::<futures::stream::FuturesUnordered<_>>()
.concat()
.await;
if peer_addresses.is_empty() {
tracing::warn!(
?peers,
?peer_addresses,
"empty peer list after DNS resolution"
);
};
peer_addresses
loop {
let peer_addresses = peers
.iter()
.map(|s| Config::resolve_host(s))
.collect::<futures::stream::FuturesUnordered<_>>()
.concat()
.await;
if peer_addresses.is_empty() {
tracing::info!(
?peers,
?peer_addresses,
"empty peer list after DNS resolution, retrying after {} seconds",
crate::constants::DNS_LOOKUP_TIMEOUT.as_secs()
);
tokio::time::sleep(crate::constants::DNS_LOOKUP_TIMEOUT).await;
} else {
return peer_addresses;
}
}
}
/// Get the initial seed peers based on the configured network.