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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | 1x 1x 1x 1x 4x 4x 4x 4x | import { Logger } from "../../../logger";
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.
* ### RENAMENX key newkey
*
* Renames key to newkey if newkey does not yet exist. It returns an error when key does not exist.
*
* In Cluster mode, both key and newkey must be in the same hash slot, meaning that in practice only
* keys that have the same hash tag can be reliably renamed in cluster.
*
* ### History
* <= 3.2.0: Before Redis 3.2.0, an error is returned if source and destination names are the same.
* ### Return value
* Integer reply, specifically:
*
* 1 if key was renamed to newkey.
* 0 if newkey already exists.
* ### Examples
* ```
* redis> SET mykey "Hello"
* "OK"
* redis> SET myotherkey "World"
* "OK"
* redis> RENAMENX mykey myotherkey
* (integer) 0
* redis> GET myotherkey
* "World"
* redis>
* ```
*/
export class RenameNxCommand extends IRespCommand {
public maxParams = 2
public minParams = 2
public name = "renamenx"
private logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
const oldKey: string = request.getParam(0),
newKey: string = request.getParam(1),
dbValue: DatabaseValue = db.get(oldKey);
if (!dbValue) {
this.logger.debug(`Key ${oldKey} does not exist`);
return RedisToken.error("ERR no such key");
} else if (db.exists(newKey)) {
this.logger.debug(`Key ${newKey} already exists`);
return RedisToken.integer(0);
}
db.rename(
oldKey,
newKey
);
this.logger.debug(`Renamed ${oldKey} to ${newKey}`);
return RedisToken.integer(1);
}
}
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