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import { IRequest } from "../../../server/request";
import { DataType } from "../../data/data-type";
import { Database } from "../../data/database";
import { DatabaseValue } from "../../data/database-value";
import { RedisToken } from "../../protocol/redis-token";
import { IRespCommand } from "../resp-command";
/**
* ### Available since 2.0.0.
* ### ZRANK key member
* Returns the rank of member in the sorted set stored at key, with the scores ordered
* from low to high. The rank (or index) is 0-based, which means that the member with
* the lowest score has rank 0.
*
* Use (not implemented ZRevRankCommand | ZREVRANK) to get the rank of an element with the scores
* ordered from high to low.
*
* ### Return value
* If member exists in the sorted set, Integer reply: the rank of member.
*
* If member does not exist in the sorted set or key does not exist, Bulk string reply: nil.
*
* ### Examples
* ```
* redis> ZADD myzset 1 "one"
* (integer) 1
* redis> ZADD myzset 2 "two"
* (integer) 1
* redis> ZADD myzset 3 "three"
* (integer) 1
* redis> ZRANK myzset "three"
* (integer) 2
* redis> ZRANK myzset "four"
* (nil)
* redis>
* ```
*/
export class ZRankCommand extends IRespCommand {
public DbDataType = DataType.ZSET
public maxParams = 2
public minParams = 2
public name = "zrank"
private logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
const key: string = request.getParam(0),
member: string = request.getParam(1);
this.logger.debug(`Getting zrank for member ${member} of key ${key}`);
const dbValue: DatabaseValue = db.get(key);
if (!dbValue) {
this.logger.debug(`Key ${key} not found`);
return RedisToken.nullString();
}
if (dbValue.getSortedSet().has(member)) {
const result: number = dbValue.getSortedSet().rank(member);
return RedisToken.integer(result);
}
this.logger.debug(`Member ${member} not found in key ${key}`);
return RedisToken.nullString();
}
}
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