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STUN actor: try to avoid ip address flapping #21

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lx merged 4 commits from stun-keep-values into main 2024-01-16 15:05:01 +00:00
Conversation 0 Commits 4 Files changed 2 +42 -43
1 changed files with 42 additions and 43 deletions
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85
src/stun_actor.rs
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@ -9,11 +9,18 @@ use crate::config::{RuntimeConfigConsul, RuntimeConfigStun};
use crate::consul;
pub struct StunActor {
node: String,
consul: consul::Consul,
stun_server_v4: Option<SocketAddr>,
stun_server_v6: SocketAddr,
refresh_time: Duration,
autodiscovery_v4: StunAutodiscovery,
autodiscovery_v6: StunAutodiscovery,
}
pub struct StunAutodiscovery {
consul_key: String,
is_ipv4: bool,
stun_server: Option<SocketAddr>,
last_result: Option<AutodiscoverResult>,
}
#[derive(Serialize, Deserialize, Debug)]
@ -34,56 +41,64 @@ impl StunActor {
.unwrap_or(true));
assert!(stun_config.stun_server_v6.is_ipv6());
let autodiscovery_v4 = StunAutodiscovery {
consul_key: format!("diplonat/autodiscovery/ipv4/{}", node),
is_ipv4: true,
stun_server: stun_config.stun_server_v4,
last_result: None,
};
let autodiscovery_v6 = StunAutodiscovery {
consul_key: format!("diplonat/autodiscovery/ipv6/{}", node),
is_ipv4: false,
stun_server: Some(stun_config.stun_server_v6),
last_result: None,
};
Self {
consul: consul::Consul::new(consul_config),
node: node.to_string(),
stun_server_v4: stun_config.stun_server_v4,
stun_server_v6: stun_config.stun_server_v6,
autodiscovery_v4,
autodiscovery_v6,
refresh_time: stun_config.refresh_time,
}
}
pub async fn listen(&mut self) -> Result<()> {
loop {
let ipv4_result = match self.stun_server_v4 {
Some(stun_server_v4) => self.autodiscover_ip(stun_server_v4).await,
None => self.autodiscover_none_ipv4().await,
};
if let Err(e) = ipv4_result {
if let Err(e) = self.autodiscovery_v4.do_iteration(&self.consul).await {
error!("Unable to autodiscover IPv4 address: {}", e);
}
if let Err(e) = self.autodiscover_ip(self.stun_server_v6).await {
if let Err(e) = self.autodiscovery_v6.do_iteration(&self.consul).await {
error!("Unable to autodiscover IPv6 address: {}", e);
}
tokio::time::sleep(self.refresh_time).await;
}
}
}
async fn autodiscover_ip(&self, stun_server: SocketAddr) -> Result<()> {
let binding_ip = match stun_server.is_ipv4() {
impl StunAutodiscovery {
async fn do_iteration(&self, consul: &consul::Consul) -> Result<()> {
let binding_ip = match self.is_ipv4 {
true => IpAddr::V4(Ipv4Addr::UNSPECIFIED), // 0.0.0.0
false => IpAddr::V6(Ipv6Addr::UNSPECIFIED), // [::]
};
let binding_addr = SocketAddr::new(binding_ip, 0);
let discovered_addr = get_mapped_addr(stun_server, binding_addr)
.await?
.map(|x| x.ip());
let discovered_addr = match self.stun_server {
Some(stun_server) => {
assert_eq!(self.is_ipv4, stun_server.is_ipv4());
let consul_key = match stun_server.is_ipv4() {
true => {
debug!("Autodiscovered IPv4: {:?}", discovered_addr);
format!("diplonat/autodiscovery/ipv4/{}", self.node)
}
false => {
debug!("Autodiscovered IPv6: {:?}", discovered_addr);
format!("diplonat/autodiscovery/ipv6/{}", self.node)
get_mapped_addr(stun_server, binding_addr)
.await?
.map(|x| x.ip())
}
None => None,
};
self.consul
consul
.kv_put(
&consul_key,
&self.consul_key,
serde_json::to_vec(&AutodiscoverResult {
timestamp: timestamp(),
address: discovered_addr,
@ -93,22 +108,6 @@ impl StunActor {
Ok(())
}
async fn autodiscover_none_ipv4(&self) -> Result<()> {
let consul_key = format!("diplonat/autodiscovery/ipv4/{}", self.node);
self.consul
.kv_put(
&consul_key,
serde_json::to_vec(&AutodiscoverResult {
timestamp: timestamp(),
address: None,
})?,
)
.await?;
Ok(())
}
}
async fn get_mapped_addr(