fix(canopy): renew the client certificate on a timer

src/bin/operator.rs

@@ -44,6 +44,9 @@ const DEFAULT_METRICS_ADDR: &str = "[::]:8080";
 const DEFAULT_METRICS_PORT: u16 = 8080;
 const DEFAULT_BROKER_ADDR: &str = "[::]:9091";
 const DEFAULT_CANOPY_RECONCILE_INTERVAL_SECS: u64 = 30;
+/// The client certificate bestool mints at construction lives six days, so the
+/// operator re-mints well inside that.
+const CANOPY_CERT_RENEW_INTERVAL: Duration = Duration::from_secs(24 * 60 * 60);
 const CONFIGMAP_NAME: &str = "postgres-restore-operator-config";
 
 /// Annotate the operator's own pod with the running version.
@@ -442,6 +445,24 @@ async fn main() -> anyhow::Result<()> {
 			register_capabilities(register_ctx).await;
 		});
 
+		let renew_ctx = ctx.clone();
+		tokio::spawn(async move {
+			let mut interval = tokio::time::interval(CANOPY_CERT_RENEW_INTERVAL);
+			interval.tick().await;
+			loop {
+				interval.tick().await;
+				let Some(canopy) = renew_ctx.canopy.as_ref() else {
+					break;
+				};
+				match canopy.renew().await {
+					Ok(()) => info!("renewed the canopy client certificate"),
+					Err(error) => {
+						warn!(error = %error, "renewing the canopy client certificate failed");
+					}
+				}
+			}
+		});
+
 		let interval_secs = std::env::var("CANOPY_RECONCILE_INTERVAL_SECS")
 			.ok()
 			.and_then(|v| v.parse::<u64>().ok())

src/canopy.rs

@@ -148,6 +148,17 @@ impl Client {
 		Ok(Some(Self { inner }))
 	}
 
+	/// Mint a fresh client certificate from the device key. The certificate the
+	/// client builds at construction is short-lived, so a process outliving it
+	/// authenticates with an expired one and canopy's edge rejects every call.
+	pub async fn renew(&self) -> Result<()> {
+		self.inner
+			.transport()
+			.renew()
+			.await
+			.map_err(|err| Error::Canopy(format!("renew: {err}")))
+	}
+
 	/// Register the intent descriptors this consumer supports. Replaces the
 	/// registered set wholesale (per canopy's semantics). Each descriptor
 	/// carries the intent name, the canopy semantics it opts into, and its