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use std::cmp;
use std::time::Duration;
use log::*;
use tokio::sync::watch;
use tokio::time::delay_for;
use anyhow::Result;
use serde::{Serialize, Deserialize};
use serde_lexpr::{from_str,error};
use crate::messages;
use crate::consul;
#[derive(Serialize, Deserialize, Debug)]
pub enum DiplonatParameter {
tcp_port(Vec<u16>),
udp_port(Vec<u16>)
}
#[derive(Serialize, Deserialize, Debug)]
pub enum DiplonatConsul {
diplonat(Vec<DiplonatParameter>)
}
pub struct ConsulActor {
pub rx_open_ports: watch::Receiver<messages::PublicExposedPorts>,
consul: consul::Consul,
node: String,
retries: u32,
tx_open_ports: watch::Sender<messages::PublicExposedPorts>
}
fn retry_to_time(retries: u32, max_time: Duration) -> Duration {
// 1.2^x seems to be a good value to exponentially increase time at a good pace
// eg. 1.2^32 = 341 seconds ~= 5 minutes - ie. after 32 retries we wait 5 minutes
return Duration::from_secs(cmp::min(max_time.as_secs(), 1.2f64.powf(retries as f64) as u64))
}
fn to_parameters(catalog: &consul::CatalogNode) -> Vec<DiplonatConsul> {
let mut r = Vec::new();
for (_, service_info) in &catalog.Services {
for tag in &service_info.Tags {
let diplo_conf: error::Result<DiplonatConsul> = from_str(tag);
match diplo_conf {
Ok(conf) => r.push(conf),
Err(e) => debug!("Failed to parse entry {}. {}", tag, e),
};
}
}
return r;
}
fn to_open_ports(params: &Vec<DiplonatConsul>) -> messages::PublicExposedPorts {
let mut op = messages::PublicExposedPorts {
tcp_ports: Vec::new(),
udp_ports: Vec::new()
};
for conf in params {
let DiplonatConsul::diplonat(c) = conf;
for parameter in c {
match parameter {
DiplonatParameter::tcp_port(p) => op.tcp_ports.extend(p),
DiplonatParameter::udp_port(p) => op.udp_ports.extend(p),
};
}
}
return op;
}
impl ConsulActor {
pub fn new(url: &str, node: &str) -> Self {
let (tx, rx) = watch::channel(messages::PublicExposedPorts{
tcp_ports: Vec::new(),
udp_ports: Vec::new()
});
return Self {
consul: consul::Consul::new(url),
rx_open_ports: rx,
tx_open_ports: tx,
node: node.to_string(),
retries: 0,
};
}
pub async fn listen(&mut self) -> Result<()> {
loop {
let catalog = match self.consul.watch_node(&self.node).await {
Ok(c) => c,
Err(e) => {
self.consul.watch_node_reset();
self.retries = cmp::min(std::u32::MAX - 1, self.retries) + 1;
let will_retry_in = retry_to_time(self.retries, Duration::from_secs(600));
error!("Failed to query consul. Will retry in {}s. {}", will_retry_in.as_secs(), e);
delay_for(will_retry_in).await;
continue;
}
};
self.retries = 0;
let msg = to_open_ports(&to_parameters(&catalog));
debug!("Extracted configuration: {:#?}", msg);
self.tx_open_ports.broadcast(msg)?;
}
}
}
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