feat: release 2.5.1

lib/session.ts

@@ -19,6 +19,15 @@ export type KuberSession = {
   };
 };
 
+let cachedSession:
+  | {
+      runtimePath: string;
+      persistentPath: string;
+      value: KuberSession | undefined;
+      expiresAt: number;
+    }
+  | undefined;
+
 function runtimeSessionPath(): string {
   const directory =
     process.env.XDG_RUNTIME_DIR ??
@@ -76,10 +85,26 @@ async function readSessionFile(
 }
 
 export async function readSession(): Promise<KuberSession | undefined> {
-  return (
-    (await readSessionFile(runtimeSessionPath())) ??
-    (await readSessionFile(persistentSessionPath()))
-  );
+  const runtimePath = runtimeSessionPath();
+  const persistentPath = persistentSessionPath();
+  if (
+    cachedSession?.runtimePath === runtimePath &&
+    cachedSession.persistentPath === persistentPath &&
+    (cachedSession.expiresAt === 0 || cachedSession.expiresAt > Date.now())
+  )
+    return cachedSession.value;
+
+  const value =
+    (await readSessionFile(runtimePath)) ??
+    (await readSessionFile(persistentPath));
+  cachedSession = {
+    runtimePath,
+    persistentPath,
+    value,
+    // Expiration is checked on every lookup, even while the file is memoized.
+    expiresAt: value ? Date.parse(value.expiresAt) : 0,
+  };
+  return value;
 }
 
 export async function writeSession(
@@ -97,6 +122,7 @@ export async function writeSession(
   await rename(temporaryPath, path);
   await chmod(path, 0o600);
   await rm(getSessionPath(!persistent), { force: true });
+  cachedSession = undefined;
   return path;
 }
 
@@ -106,4 +132,5 @@ export async function removeSessions(): Promise<void> {
       rm(path, { force: true }),
     ),
   );
+  cachedSession = undefined;
 }