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use std::sync::Arc;
use structopt::StructOpt;
use tokio::select;
use tokio::sync::watch;
use tracing::*;
mod dns_config;
mod dns_updater;
mod provider;
#[derive(StructOpt, Debug)]
#[structopt(name = "d53")]
pub struct Opt {
/// Address of consul server
#[structopt(
long = "consul-addr",
env = "D53_CONSUL_HOST",
default_value = "http://127.0.0.1:8500"
)]
pub consul_addr: String,
/// CA certificate for Consul server with TLS
#[structopt(long = "consul-ca-cert", env = "D53_CONSUL_CA_CERT")]
pub consul_ca_cert: Option<String>,
/// Skip TLS verification for Consul
#[structopt(long = "consul-tls-skip-verify", env = "D53_CONSUL_TLS_SKIP_VERIFY")]
pub consul_tls_skip_verify: bool,
/// Client certificate for Consul server with TLS
#[structopt(long = "consul-client-cert", env = "D53_CONSUL_CLIENT_CERT")]
pub consul_client_cert: Option<String>,
/// Client key for Consul server with TLS
#[structopt(long = "consul-client-key", env = "D53_CONSUL_CLIENT_KEY")]
pub consul_client_key: Option<String>,
/// DNS provider
#[structopt(long = "providers", env = "D53_PROVIDERS")]
pub providers: String,
/// Allowed domains
#[structopt(long = "allowed-domains", env = "D53_ALLOWED_DOMAINS")]
pub allowed_domains: String,
/// API key for Gandi DNS provider
#[structopt(long = "gandi-api-key", env = "D53_GANDI_API_KEY")]
pub gandi_api_key: Option<String>,
}
pub struct DomainProvider {
pub domain: String,
pub provider: Box<dyn provider::DnsProvider>,
}
#[tokio::main]
async fn main() {
if std::env::var("RUST_LOG").is_err() {
std::env::set_var("RUST_LOG", "tricot=info")
}
tracing_subscriber::fmt()
.with_writer(std::io::stderr)
.with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
.init();
// Abort on panic (same behavior as in Go)
std::panic::set_hook(Box::new(|panic_info| {
error!("{}", panic_info.to_string());
std::process::abort();
}));
let opt = Opt::from_args();
info!("Starting D53");
let (exit_signal, _) = watch_ctrl_c();
let consul_config = df_consul::Config {
addr: opt.consul_addr.clone(),
ca_cert: opt.consul_ca_cert.clone(),
tls_skip_verify: opt.consul_tls_skip_verify,
client_cert: opt.consul_client_cert.clone(),
client_key: opt.consul_client_key.clone(),
};
let consul = df_consul::Consul::new(consul_config, "").expect("Cannot build Consul");
let mut domain_providers = vec![];
for pstr in opt.providers.as_str().split(',') {
let (domain, provider) = pstr.split_once(':')
.expect("Invalid provider syntax, expected: <domain_name>:<provider>[,<domain_name>:<provider>[,...]]");
let provider: Box<dyn provider::DnsProvider> = match provider {
"gandi" => Box::new(
provider::gandi::GandiProvider::new(&opt).expect("Cannot initialize Gandi provier"),
),
p => panic!("Unsupported DNS provider: {}", p),
};
domain_providers.push(DomainProvider {
domain: domain.to_string(),
provider,
});
}
if domain_providers.is_empty() {
panic!("No domain providers were specified.");
}
let allowed_domains = opt
.allowed_domains
.split(',')
.map(ToString::to_string)
.collect::<Vec<_>>();
let rx_dns_config = dns_config::spawn_dns_config_task(&consul, exit_signal.clone());
let updater_task = tokio::spawn(dns_updater::dns_updater_task(
rx_dns_config.clone(),
domain_providers,
allowed_domains,
exit_signal.clone(),
));
let dump_task = tokio::spawn(dump_config_on_change(rx_dns_config, exit_signal));
updater_task.await.expect("Tokio task await failure");
dump_task.await.expect("Tokio task await failure");
}
async fn dump_config_on_change(
mut rx_dns_config: watch::Receiver<Arc<dns_config::DnsConfig>>,
mut must_exit: watch::Receiver<bool>,
) {
let mut prev_dns_config = Arc::new(dns_config::DnsConfig::default());
while !*must_exit.borrow() {
select!(
c = rx_dns_config.changed() => {
if c.is_err() {
break;
}
}
_ = must_exit.changed() => continue,
);
let new_dns_config = rx_dns_config.borrow_and_update().clone();
if new_dns_config != prev_dns_config {
println!("---- DNS CONFIGURATION ----");
for (k, v) in rx_dns_config.borrow().entries.iter() {
println!(" {} {}", k, v);
}
println!();
}
prev_dns_config = new_dns_config;
}
}
/// Creates a watch that contains `false`, and that changes
/// to `true` when a Ctrl+C signal is received.
pub fn watch_ctrl_c() -> (watch::Receiver<bool>, Arc<watch::Sender<bool>>) {
let (send_cancel, watch_cancel) = watch::channel(false);
let send_cancel = Arc::new(send_cancel);
let send_cancel_2 = send_cancel.clone();
tokio::spawn(async move {
tokio::signal::ctrl_c()
.await
.expect("failed to install CTRL+C signal handler");
info!("Received CTRL+C, shutting down.");
send_cancel.send(true).unwrap();
});
(watch_cancel, send_cancel_2)
}
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