feat: add data migration for dns entries

src/data_migration/dns.rs

@@ -0,0 +1,55 @@
+use crate::data_migration::DataMigration;
+use crate::dns::{BasicRecord, DnsServer};
+use crate::settings::Settings;
+use anyhow::Result;
+use lnvps_db::LNVpsDb;
+use std::future::Future;
+use std::pin::Pin;
+use std::sync::Arc;
+
+pub struct DnsDataMigration {
+    db: Arc<dyn LNVpsDb>,
+    dns: Arc<dyn DnsServer>,
+}
+
+impl DnsDataMigration {
+    pub fn new(db: Arc<dyn LNVpsDb>, settings: &Settings) -> Option<Self> {
+        let dns = settings.get_dns().ok().flatten()?;
+        Some(Self { db, dns })
+    }
+}
+
+impl DataMigration for DnsDataMigration {
+    fn migrate(&self) -> Pin<Box<dyn Future<Output = Result<()>> + Send>> {
+        let db = self.db.clone();
+        let dns = self.dns.clone();
+        Box::pin(async move {
+            let vms = db.list_vms().await?;
+
+            for vm in vms {
+                let mut ips = db.list_vm_ip_assignments(vm.id).await?;
+                for mut ip in &mut ips {
+                    let mut did_change = false;
+                    if ip.dns_forward.is_none() {
+                        let rec = BasicRecord::forward(&ip)?;
+                        let r = dns.add_record(&rec).await?;
+                        ip.dns_forward = Some(r.name);
+                        ip.dns_forward_ref = r.id;
+                        did_change = true;
+                    }
+                    if ip.dns_reverse.is_none() {
+                        let rec = BasicRecord::reverse(&ip)?;
+                        let r = dns.add_record(&rec).await?;
+                        ip.dns_reverse = Some(r.name);
+                        ip.dns_reverse_ref = r.id;
+                        did_change = true;
+                    }
+                    if did_change {
+                        db.update_vm_ip_assignment(ip).await?;
+                    }
+                }
+            }
+            Ok(())
+        })
+    }
+}