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import { IRequest } from "../../../server/request";
import { Database } from "../../data/database";
import { DatabaseValue } from "../../data/database-value";
import { RedisToken } from "../../protocol/redis-token";
import { IRespCommand } from "../resp-command";
/**
* ### Available since 1.0.0.
* ### TTL key
*
* Returns the remaining time to live of a key that has a timeout. This introspection capability
* allows a Redis client to check how many seconds a given key will continue to be part of the
* dataset.
*
* In Redis 2.6 or older the command returns -1 if the key does not exist or if the key exist but
* has no associated expire.
*
* Starting with Redis 2.8 the return value in case of error changed:
* - The command returns -2 if the key does not exist.
* - The command returns -1 if the key exists but has no associated expire.
*
* **unit-redis-ness** implementes the post 2.8 pattern
*
* See also the PTTL command that returns the same information with milliseconds resolution
* (Only available in Redis 2.6 or greater).
* ### Return value
* Integer reply: TTL in seconds, or a negative value in order to signal an error (see the
* description above).
* ### Examples
* ```
* redis> SET mykey "Hello"
* "OK"
* redis> EXPIRE mykey 10
* (integer) 1
* redis> TTL mykey
* (integer) 10
* redis>
* ```
*/
export class TtlCommand extends IRespCommand {
public maxParams = 1
public minParams = 1
public name = "ttl"
private logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
let ttl: number = -2;
const key: string = request.getParam(0);
this.logger.debug(`Getting dbValue ${key}`);
const dbKey: DatabaseValue = db.get(key);
if (dbKey) {
ttl = dbKey.timeToLiveSeconds(new Date().getTime());
}
return RedisToken.integer(ttl);
}
}
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