blacklist with automatic garbage collector

lib/RedisData/RedisBlacklistStore.ts

@@ -11,14 +11,18 @@ import { Redis } from '../Redis';
 const logger = debug ('RedisBlacklistStore');
 
 export class RedisBlacklistStore extends Redis {
-  public async add (key: string): Promise<void> {
+  public async add (key: string, valid_until: Date): Promise<void> {
     const log = logger.extend ('set');
     log ('trying to add key %s to redis blacklist', key);
     if (!this.is_active) {
       log ('redis is inactive, skipping');
       return;
     }
-    await this.redis.sadd ('blacklist', key);
+    await this.redis.setex (
+      `blacklist_${key}`,
+      (valid_until.getTime () - Date.now ()) / 1000,
+      1
+    );
     log ('saved key');
   }
 
@@ -29,7 +33,7 @@ export class RedisBlacklistStore extends Redis {
       log ('redis is inactive, skipping');
       return;
     }
-    await this.redis.srem ('blacklist', key);
+    await this.redis.del (`blacklist_${key}`);
     log ('removed key');
   }
 
@@ -40,7 +44,7 @@ export class RedisBlacklistStore extends Redis {
       log ('redis is inactive, skipping');
       return false;
     }
-    const res = await this.redis.sismember ('blacklist', key) === 1;
+    const res = await this.redis.exists (`blacklist_${key}`) === 1;
     log ('found key %s', res);
     return res;
   }