Async (#30)

- manual eventloop now replaced by asycn-await using the tokio runtime
- dns no longer blocks the event loop
- simplifies logic
- makes xdg-desktop-portal easier to integrate

src/dns.rs

@@ -1,20 +1,23 @@
 use anyhow::Result;
 use std::{error::Error, net::IpAddr};
 
-use trust_dns_resolver::Resolver;
+use trust_dns_resolver::TokioAsyncResolver;
 
 pub(crate) struct DnsResolver {
-    resolver: Resolver,
+    resolver: TokioAsyncResolver,
 }
 impl DnsResolver {
-    pub(crate) fn new() -> Result<Self> {
-        let resolver = Resolver::from_system_conf()?;
+    pub(crate) async fn new() -> Result<Self> {
+        let resolver = TokioAsyncResolver::tokio_from_system_conf()?;
         Ok(Self { resolver })
     }
 
-    pub(crate) fn resolve(&self, host: &str) -> Result<Vec<IpAddr>, Box<dyn Error>> {
+    pub(crate) async fn resolve(&self, host: &str) -> Result<Vec<IpAddr>, Box<dyn Error>> {
         log::info!("resolving {host} ...");
-        let response = self.resolver.lookup_ip(host)?;
+        let response = self.resolver.lookup_ip(host).await?;
+        for ip in response.iter() {
+            log::info!("{host}: adding ip {ip}");
+        }
         Ok(response.iter().collect())
     }
 }