CLI tool for updating Route53 DNS for an ASG.

17 files changed, 2790 insertions, 0 deletions

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..5aa5cd3
--- /dev/null
+++ b/.envrc
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diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7f1c428
--- /dev/null
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index 0000000..b789bb1
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2e2abd5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "aws-autoscaling-dns"
+version = "0.1.0-dev"
+
+authors = ["owen@grimoire.ca"]
+readme = "README.md"
+license = "All rights reserved"
+description = "Automatically synch an AWS autoscaling group with a Route53 DNS entry"
+edition = "2021"
+
+publish = false
+
+[dependencies]
+anyhow = "1.0.75"
+aws-config = "0.56.1"
+aws-sdk-autoscaling = "0.33.0"
+aws-sdk-ec2 = "0.33.1"
+aws-sdk-route53 = "0.33.1"
+aws-types = "0.56.1"
+clap = { version = "4.4.6", features = ["derive"] }
+futures = "0.3.28"
+tokio = { version = "1.33.0", features = ["full"] }
+tokio-stream = "0.1.14"
+trust-dns-proto = "0.23.0"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..92c92ea
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# AWS Autoscaling DNS CLI
+
+See `--help` output for details.
diff --git a/src/apply.rs b/src/apply.rs
new file mode 100644
index 0000000..86e92b4
--- /dev/null
+++ b/src/apply.rs
@@ -0,0 +1,87 @@
+use aws_sdk_route53::types::{Change, ChangeAction, ChangeBatch, ResourceRecordSet};
+
+use crate::result::Result;
+use crate::route53::Route53;
+
+pub enum ApplyMode {
+    DryRun,
+    Apply,
+}
+
+impl ApplyMode {
+    pub async fn apply<C, R, I>(
+        &self,
+        aws_context: &C,
+        zone_id: &str,
+        remove_records: R,
+        insert_records: I,
+    ) -> Result<()>
+    where
+        C: Route53,
+        R: IntoIterator<Item = ResourceRecordSet>,
+        I: IntoIterator<Item = ResourceRecordSet>,
+    {
+        match self {
+            ApplyMode::DryRun => dry_run(zone_id, remove_records, insert_records).await,
+            ApplyMode::Apply => apply(aws_context, zone_id, remove_records, insert_records).await,
+        }
+    }
+}
+
+async fn dry_run<R, I>(zone_id: &str, remove_records: R, insert_records: I) -> Result<()>
+where
+    R: IntoIterator<Item = ResourceRecordSet>,
+    I: IntoIterator<Item = ResourceRecordSet>,
+{
+    let remove_records: Vec<_> = remove_records.into_iter().collect();
+    let insert_records: Vec<_> = insert_records.into_iter().collect();
+
+    println!("ZONE: {}", zone_id);
+    println!("REMOVE: {:#?}", remove_records);
+    println!("INSERT: {:#?}", insert_records);
+
+    Ok(())
+}
+
+async fn apply<C, R, I>(
+    aws_context: &C,
+    zone_id: &str,
+    remove_records: R,
+    insert_records: I,
+) -> Result<()>
+where
+    C: Route53,
+    R: IntoIterator<Item = ResourceRecordSet>,
+    I: IntoIterator<Item = ResourceRecordSet>,
+{
+    let mut change_batch = ChangeBatch::builder();
+    for remove_record in remove_records {
+        let change = Change::builder()
+            .action(ChangeAction::Delete)
+            .resource_record_set(remove_record)
+            .build();
+        change_batch = change_batch.changes(change);
+    }
+    for insert_record in insert_records {
+        let change = Change::builder()
+            .action(ChangeAction::Create)
+            .resource_record_set(insert_record)
+            .build();
+        change_batch = change_batch.changes(change);
+    }
+    let change_batch = change_batch.build();
+
+    if let Some(changes) = change_batch.changes() {
+        if !changes.is_empty() {
+            aws_context
+                .route53()
+                .change_resource_record_sets()
+                .hosted_zone_id(zone_id)
+                .change_batch(change_batch)
+                .send()
+                .await?;
+        }
+    }
+
+    Ok(())
+}
diff --git a/src/autoscaling.rs b/src/autoscaling.rs
new file mode 100644
index 0000000..6c96279
--- /dev/null
+++ b/src/autoscaling.rs
@@ -0,0 +1,34 @@
+use anyhow::anyhow;
+use aws_sdk_autoscaling as autoscaling;
+use aws_sdk_autoscaling::types::AutoScalingGroup;
+
+use crate::result::Result;
+use crate::single::Single;
+
+pub trait AutoScaling {
+    fn autoscaling(&self) -> &autoscaling::Client;
+}
+
+pub async fn asg_by_name<C>(aws_context: &C, name: &str) -> Result<AutoScalingGroup>
+where
+    C: AutoScaling,
+{
+    let asg_resp = aws_context
+        .autoscaling()
+        .describe_auto_scaling_groups()
+        .auto_scaling_group_names(name)
+        .send()
+        .await?;
+
+    let auto_scaling_groups = asg_resp.auto_scaling_groups().unwrap_or(&[]);
+    let auto_scaling_group = auto_scaling_groups
+        .iter()
+        .map(ToOwned::to_owned)
+        .single()
+        .ok_or(anyhow!(
+            "No unique autoscaling group found with name: {}",
+            name
+        ))?;
+
+    Ok(auto_scaling_group)
+}
diff --git a/src/aws_context.rs b/src/aws_context.rs
new file mode 100644
index 0000000..2eff941
--- /dev/null
+++ b/src/aws_context.rs
@@ -0,0 +1,48 @@
+use aws_sdk_autoscaling as asg;
+use aws_sdk_ec2 as ec2;
+use aws_sdk_route53 as route53;
+use aws_types::SdkConfig;
+
+use crate::autoscaling::AutoScaling;
+use crate::ec2::Ec2;
+use crate::route53::Route53;
+
+pub struct AwsContext {
+    asg: asg::Client,
+    ec2: ec2::Client,
+    route53: route53::Client,
+}
+
+impl AwsContext {
+    pub async fn from_env() -> Self {
+        let config = aws_config::from_env().load().await;
+
+        Self::new(&config)
+    }
+
+    fn new(config: &SdkConfig) -> Self {
+        Self {
+            asg: asg::Client::new(config),
+            ec2: ec2::Client::new(config),
+            route53: route53::Client::new(config),
+        }
+    }
+}
+
+impl AutoScaling for AwsContext {
+    fn autoscaling(&self) -> &asg::Client {
+        &self.asg
+    }
+}
+
+impl Ec2 for AwsContext {
+    fn ec2(&self) -> &ec2::Client {
+        &self.ec2
+    }
+}
+
+impl Route53 for AwsContext {
+    fn route53(&self) -> &route53::Client {
+        &self.route53
+    }
+}
diff --git a/src/bin/aws-autoscaling-dns/main.rs b/src/bin/aws-autoscaling-dns/main.rs
new file mode 100644
index 0000000..739f0c8
--- /dev/null
+++ b/src/bin/aws-autoscaling-dns/main.rs
@@ -0,0 +1,68 @@
+use std::fmt::Debug;
+
+use clap::Parser;
+use trust_dns_proto::rr::Name;
+
+use aws_autoscaling_dns::apply::ApplyMode;
+use aws_autoscaling_dns::aws_context::AwsContext;
+use aws_autoscaling_dns::converge::named_asg_changes;
+use aws_autoscaling_dns::result::Result;
+
+/// Synchronize a DNS entry with an autoscaling group's running instances.
+///
+/// The given DNS name's A and AAAA records in Route53 will be rewritten to exactly
+/// match the list of pending and in-service EC2 instances in the specified
+/// autoscaling group. Records of other types (including CNAMEs) will not be
+/// modified, so this can be used alongside DNS ACME verification, SPF, and other
+/// DNS applications.
+#[derive(Parser, Debug)]
+struct Args {
+    /// The name of the autoscaling group to synchronize.
+    #[arg(long)]
+    autoscaling_group: String,
+
+    /// The DNS domain name to synchronize. The most specific Route53 zone that
+    /// contains this name will be modified.
+    #[arg(long)]
+    dns_name: Name,
+
+    /// The TTL (in seconds) for newly-created records.
+    #[arg(long, default_value_t = 300)]
+    dns_ttl: i64,
+
+    /// Print the affected zone ID and pending changes, without applying them (default).
+    #[arg(long, conflicts_with = "apply")]
+    dry_run: bool,
+
+    /// Apply the changes to Route53.
+    #[arg(long)]
+    apply: bool,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let args = Args::parse();
+    let name = args.autoscaling_group;
+
+    let aws_context = AwsContext::from_env().await;
+
+    let apply_mode = if args.dry_run {
+        ApplyMode::DryRun
+    } else if args.apply {
+        ApplyMode::Apply
+    } else {
+        ApplyMode::DryRun
+    };
+
+    let changes = named_asg_changes(&aws_context, &name, &args.dns_name, args.dns_ttl).await?;
+    apply_mode
+        .apply(
+            &aws_context,
+            &changes.zone_id,
+            changes.remove,
+            changes.insert,
+        )
+        .await?;
+
+    Ok(())
+}
diff --git a/src/converge.rs b/src/converge.rs
new file mode 100644
index 0000000..073e9e6
--- /dev/null
+++ b/src/converge.rs
@@ -0,0 +1,85 @@
+use std::fmt::Debug;
+
+use anyhow::anyhow;
+use aws_sdk_autoscaling::types::AutoScalingGroup;
+use aws_sdk_route53::types::ResourceRecordSet;
+use futures::try_join;
+use trust_dns_proto::rr::Name;
+
+use crate::autoscaling::{asg_by_name, AutoScaling};
+use crate::dns::AutoScalingGroupConfig;
+use crate::ec2::{instance_recordsets, Ec2};
+use crate::hashable::Hashable;
+use crate::result::Result;
+use crate::route53::{zone_for_domain, zone_suffix_recordsets, Route53};
+
+#[derive(Debug)]
+pub struct Changes<T> {
+    pub zone_id: String,
+    pub remove: T,
+    pub insert: T,
+}
+
+async fn changes<C>(
+    aws_context: &C,
+    auto_scaling_group: &AutoScalingGroup,
+    dns_name: &Name,
+    dns_ttl: i64,
+) -> Result<Changes<impl IntoIterator<Item = ResourceRecordSet> + Debug>>
+where
+    C: Ec2 + Route53,
+{
+    let AutoScalingGroupConfig {
+        name: asg_name,
+        live_instance_ids,
+    } = AutoScalingGroupConfig::try_from(auto_scaling_group)?;
+
+    let zone = zone_for_domain(dns_name, aws_context).await?;
+    let zone_id = zone
+        .id()
+        .ok_or(anyhow!("No ID for hosted zone for name: {}", dns_name))?;
+
+    let (intended_records, actual_records) = try_join!(
+        instance_recordsets(
+            &asg_name,
+            dns_name,
+            dns_ttl,
+            &live_instance_ids,
+            aws_context
+        ),
+        zone_suffix_recordsets(dns_name, zone_id, aws_context),
+    )?;
+
+    let remove_records = actual_records.difference(&intended_records);
+    let insert_records = intended_records.difference(&actual_records);
+
+    let remove_records = remove_records.map(Hashable::as_ref);
+    let insert_records = insert_records.map(Hashable::as_ref);
+
+    let remove_records = remove_records.map(ToOwned::to_owned);
+    let insert_records = insert_records.map(ToOwned::to_owned);
+
+    let remove_records: Vec<_> = remove_records.collect();
+    let insert_records: Vec<_> = insert_records.collect();
+
+    Ok(Changes {
+        zone_id: zone_id.into(),
+        remove: remove_records,
+        insert: insert_records,
+    })
+}
+
+pub async fn named_asg_changes<C>(
+    aws_context: &C,
+    name: &str,
+    dns_name: &Name,
+    dns_ttl: i64,
+) -> Result<Changes<impl IntoIterator<Item = ResourceRecordSet> + Debug>>
+where
+    C: AutoScaling + Ec2 + Route53,
+{
+    let auto_scaling_group = asg_by_name(aws_context, name).await?;
+
+    let changes = changes(aws_context, &auto_scaling_group, dns_name, dns_ttl).await?;
+    Ok(changes)
+}
diff --git a/src/dns.rs b/src/dns.rs
new file mode 100644
index 0000000..13e3650
--- /dev/null
+++ b/src/dns.rs
@@ -0,0 +1,75 @@
+use std::convert::TryFrom;
+use std::fmt::Debug;
+
+use anyhow::anyhow;
+use aws_sdk_autoscaling::types::{AutoScalingGroup, Instance, LifecycleState};
+use trust_dns_proto::rr::Name;
+
+use crate::result::{Error, Result};
+
+#[derive(Debug)]
+pub struct AutoScalingGroupConfig {
+    pub name: String,
+    pub live_instance_ids: Vec<String>,
+}
+
+impl AutoScalingGroupConfig {
+    fn live_instance_ids<'a>(instances: impl IntoIterator<Item = &'a Instance>) -> Vec<String> {
+        instances
+            .into_iter()
+            .filter(|instance| match instance.lifecycle_state() {
+                // See <https://docs.aws.amazon.com/autoscaling/ec2/userguide/AutoScalingGroupLifecycle.html>
+                //
+                // Include pending instances so that they can obtain certs, etc.
+                Some(LifecycleState::Pending) => true,
+                Some(LifecycleState::PendingWait) => true,
+                Some(LifecycleState::PendingProceed) => true,
+                Some(LifecycleState::InService) => true,
+                _ => false,
+            })
+            .flat_map(|instance| instance.instance_id())
+            .map(ToOwned::to_owned)
+            .collect()
+    }
+}
+
+impl TryFrom<&AutoScalingGroup> for AutoScalingGroupConfig {
+    type Error = Error;
+
+    fn try_from(autoscaling_group: &AutoScalingGroup) -> Result<Self> {
+        let name = autoscaling_group
+            .auto_scaling_group_name()
+            .ok_or(anyhow!("Autoscaling group returned from AWS with no name"))?
+            .to_owned();
+
+        let instances = autoscaling_group.instances().unwrap_or(&[]);
+
+        let live_instance_ids = Self::live_instance_ids(instances);
+
+        Ok(Self {
+            name,
+            live_instance_ids,
+        })
+    }
+}
+
+pub fn suffixes(mut name: Name) -> Vec<Name> {
+    let mut names = Vec::new();
+
+    loop {
+        names.push(name.clone());
+        if name.is_root() {
+            break;
+        } else {
+            name = name.base_name();
+        }
+    }
+
+    names
+}
+
+pub fn absolute(name: Name) -> Result<Name> {
+    let root = &Name::root();
+    let absolute = name.append_name(root)?;
+    Ok(absolute)
+}
diff --git a/src/ec2.rs b/src/ec2.rs
new file mode 100644
index 0000000..28169e7
--- /dev/null
+++ b/src/ec2.rs
@@ -0,0 +1,83 @@
+use std::collections::HashSet;
+
+use aws_sdk_ec2 as ec2;
+use aws_sdk_ec2::types::Filter;
+use aws_sdk_route53::types::{ResourceRecordSet, RrType};
+use tokio_stream::StreamExt;
+use trust_dns_proto::rr::Name;
+
+use crate::dns::absolute;
+use crate::hashable::Hashable;
+use crate::result::Result;
+use crate::route53::recordset;
+
+pub trait Ec2 {
+    fn ec2(&self) -> &ec2::Client;
+}
+
+pub async fn instance_recordsets<C>(
+    asg_name: &str,
+    dns_suffix: &Name,
+    dns_ttl: i64,
+    live_instance_ids: &[String],
+    aws_context: &C,
+) -> Result<HashSet<Hashable<ResourceRecordSet>>>
+where
+    C: Ec2,
+{
+    // If there's nothing running, then (a) we don't need to ask AWS about
+    // running instances, and (b) we can't anyways as the API call requires at
+    // least one instance ID. Abort here.
+    if live_instance_ids.is_empty() {
+        return Ok(HashSet::new());
+    }
+
+    let asg_filter = Filter::builder()
+        .name("tag:aws:autoscaling:groupName")
+        .values(asg_name)
+        .build();
+
+    let mut apex_ip4 = HashSet::new();
+    let mut apex_ip6 = HashSet::new();
+
+    let mut instances_paginator = aws_context
+        .ec2()
+        .describe_instances()
+        .set_instance_ids(Some(live_instance_ids.to_owned()))
+        .filters(asg_filter)
+        .into_paginator()
+        .items()
+        .send();
+
+    while let Some(reservation) = instances_paginator.try_next().await? {
+        let instances = reservation.instances().unwrap_or(&[]);
+        for instance in instances {
+            // Mild abuse of the fact that optional values are also iterable
+            apex_ip4.extend(instance.public_ip_address().map(String::from));
+
+            let instance_interfaces = instance.network_interfaces().unwrap_or(&[]);
+            let instance_ip6: Vec<_> = instance_interfaces
+                .iter()
+                .flat_map(|interface| interface.ipv6_addresses().unwrap_or(&[]))
+                // Flatmap here to drop the None values, unwrap the Some values
+                .flat_map(|ipv6| ipv6.ipv6_address())
+                .map(String::from)
+                .collect();
+
+            apex_ip6.extend(instance_ip6.iter().map(ToOwned::to_owned).map(String::from));
+        }
+    }
+
+    let apex_hostname = absolute(dns_suffix.clone())?;
+    let apex_hostname = apex_hostname.to_ascii();
+
+    let mut asg_recordsets = HashSet::new();
+    if !apex_ip4.is_empty() {
+        asg_recordsets.insert(recordset(&apex_hostname, dns_ttl, RrType::A, apex_ip4).into());
+    }
+    if !apex_ip6.is_empty() {
+        asg_recordsets.insert(recordset(&apex_hostname, dns_ttl, RrType::Aaaa, apex_ip6).into());
+    }
+
+    Ok(asg_recordsets)
+}
diff --git a/src/hashable.rs b/src/hashable.rs
new file mode 100644
index 0000000..22bcdd3
--- /dev/null
+++ b/src/hashable.rs
@@ -0,0 +1,37 @@
+use std::fmt::Debug;
+use std::hash::{Hash, Hasher};
+
+use aws_sdk_route53::types::ResourceRecordSet;
+
+pub trait SimpleHash {
+    fn hash<H: Hasher>(&self, state: &mut H);
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct Hashable<T>(T);
+
+impl<T> AsRef<T> for Hashable<T> {
+    fn as_ref(&self) -> &T {
+        &self.0
+    }
+}
+
+impl<T> Eq for Hashable<T> where Hashable<T>: PartialEq {}
+
+impl<T: SimpleHash> Hash for Hashable<T> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.0.hash(state)
+    }
+}
+
+impl<T> From<T> for Hashable<T> {
+    fn from(value: T) -> Self {
+        Self(value)
+    }
+}
+
+impl SimpleHash for ResourceRecordSet {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.name().hash(state)
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ccfa2ac
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,10 @@
+pub mod apply;
+mod autoscaling;
+pub mod aws_context;
+pub mod converge;
+mod dns;
+mod ec2;
+mod hashable;
+pub mod result;
+mod route53;
+mod single;
diff --git a/src/result.rs b/src/result.rs
new file mode 100644
index 0000000..7c607c5
--- /dev/null
+++ b/src/result.rs
@@ -0,0 +1,4 @@
+use anyhow;
+
+pub type Error = anyhow::Error;
+pub type Result<T> = std::result::Result<T, Error>;
diff --git a/src/route53.rs b/src/route53.rs
new file mode 100644
index 0000000..22e4126
--- /dev/null
+++ b/src/route53.rs
@@ -0,0 +1,143 @@
+use std::collections::HashSet;
+use std::str::FromStr;
+
+use anyhow::anyhow;
+use aws_sdk_route53 as route53;
+use aws_sdk_route53::types::{HostedZone, ResourceRecord, ResourceRecordSet, RrType};
+use trust_dns_proto::rr::Name;
+
+use crate::dns::suffixes;
+use crate::hashable::Hashable;
+use crate::result::Result;
+
+pub trait Route53 {
+    fn route53(&self) -> &route53::Client;
+}
+
+pub async fn zone_for_domain<C>(name: &Name, aws_context: &C) -> Result<HostedZone>
+where
+    C: Route53,
+{
+    let names = suffixes(name.clone());
+
+    // Outer pagination loop needs to be pulled out to a trait - this is some hot nonsense.
+    let mut zone = None;
+    let mut depth = None;
+    let mut zones_marker = None;
+    loop {
+        let zones_resp = aws_context
+            .route53()
+            .list_hosted_zones()
+            .set_marker(zones_marker)
+            .send()
+            .await?;
+
+        let zones = zones_resp.hosted_zones().unwrap_or(&[]);
+        for candidate_zone in zones.iter() {
+            let zone_name = match candidate_zone.name() {
+                None => continue,
+                Some(name) => name,
+            };
+            let zone_name = Name::from_str(zone_name)?;
+            let match_position = names.iter().position(|name| *name == zone_name);
+            match (depth, match_position) {
+                (None, Some(matched_depth)) => {
+                    zone = Some(candidate_zone.clone());
+                    depth = Some(matched_depth);
+                }
+                (Some(found_depth), Some(matched_depth)) => {
+                    if matched_depth < found_depth {
+                        zone = Some(candidate_zone.clone());
+                        depth = Some(matched_depth);
+                    }
+                }
+                (_, _) => {}
+            }
+        }
+
+        if zones_resp.is_truncated() {
+            zones_marker = zones_resp.next_marker().map(String::from);
+        } else {
+            break;
+        }
+    }
+
+    zone.ok_or(anyhow!("No Route53 zone found for DNS suffix: {}", name))
+}
+
+pub async fn zone_suffix_recordsets<C>(
+    dns_suffix: &Name,
+    zone_id: &str,
+    aws_context: &C,
+) -> Result<HashSet<Hashable<ResourceRecordSet>>>
+where
+    C: Route53,
+{
+    let mut suffix_records = HashSet::new();
+
+    let mut next_record_name = Some(dns_suffix.to_ascii());
+    let mut next_record_type = None;
+    let mut next_record_identifier = None;
+
+    loop {
+        let records_resp = aws_context
+            .route53()
+            .list_resource_record_sets()
+            .hosted_zone_id(zone_id)
+            .set_start_record_name(next_record_name)
+            .set_start_record_type(next_record_type)
+            .set_start_record_identifier(next_record_identifier)
+            .send()
+            .await?;
+
+        let recordsets = records_resp.resource_record_sets().unwrap_or(&[]);
+        for recordset in recordsets {
+            let recordset_name = recordset.name().ok_or(anyhow!(
+                "Record set with no name found in zone: {}",
+                zone_id
+            ))?;
+            let recordset_name = Name::from_str(recordset_name)?;
+            let recordset_names = suffixes(recordset_name);
+
+            if !recordset_names.iter().any(|name| name == dns_suffix) {
+                break;
+            }
+
+            suffix_records.insert(recordset.clone().into());
+        }
+
+        if records_resp.is_truncated() {
+            next_record_name = records_resp.next_record_name().map(String::from);
+            next_record_type = records_resp.next_record_type().map(Clone::clone);
+            next_record_identifier = records_resp.next_record_identifier().map(String::from);
+        } else {
+            break;
+        }
+    }
+
+    Ok(suffix_records)
+}
+
+pub fn recordset<I, S>(
+    apex_hostname: &str,
+    dns_ttl: i64,
+    rr_type: RrType,
+    addresses: I,
+) -> ResourceRecordSet
+where
+    I: IntoIterator<Item = S>,
+    S: Into<String>,
+{
+    let apex_ip4_records = addresses
+        .into_iter()
+        .map(|address| address.into())
+        .map(|address| ResourceRecord::builder().value(address).build())
+        .collect();
+
+    ResourceRecordSet::builder()
+        .name(apex_hostname)
+        .r#type(rr_type)
+        .ttl(dns_ttl)
+        .set_resource_records(Some(apex_ip4_records))
+        .build()
+}
diff --git a/src/single.rs b/src/single.rs
new file mode 100644
index 0000000..b3f0b18
--- /dev/null
+++ b/src/single.rs
@@ -0,0 +1,24 @@
+pub trait Single {
+    type Item;
+
+    fn single(self) -> Option<Self::Item>;
+}
+
+impl<T, I> Single for I
+where
+    I: IntoIterator<Item = T>,
+{
+    type Item = T;
+
+    fn single(self) -> Option<Self::Item> {
+        let mut iter = self.into_iter();
+
+        // There are three cases of interest:
+        //
+        // 1. `self` has zero items -> return None.
+        // 2. `self` has two or more items -> return None.
+        // 3. `self` has exactly one item -> return `iter.next()` unchanged, as
+        //    it holds that item.
+        iter.next().filter(|_| iter.next().is_none())
+    }
+}