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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 | 1x 1x 1x 1x 1x 4x 4x 4x 4x 4x | import { Logger } from "../../../logger";
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 1.0.0.
* ### LINDEX key index
* Returns the element at index index in the list stored at key. The index is zero-based,
* so 0 means the first element, 1 the second element and so on. Negative indices can be used
* to designate elements starting at the tail of the list. Here, -1 means the last element,
* -2 means the penultimate and so forth.
*
* When the value at key is not a list, an error is returned.
*
* ### Return value
* Bulk string reply: the requested element, or nil when index is out of range.
*/
export class LIndexCommand extends IRespCommand {
public DbDataType = DataType.LIST
public maxParams = 2
public minParams = 2
public name = "lindex"
private logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
const key: string = request.getParam(0),
list: DatabaseValue = db.get(key);
this.logger.debug(`Getting list "${key}"`);
if (!list) {
this.logger.debug(`LIST ${key} does not exist. Returning NIL`);
return RedisToken.nullString();
}
const index: string = request.getParam(1);
if (isNaN(Number(index)) || Number(index) !== parseInt(
index,
10
)) {
return RedisToken.error("ERR value is not an integer or out of range");
}
const len: number = Number(index) < 0 && Math.abs(Number(index)) < list.getList().length
? list.getList().length + 1 + Number(index)
: Number(index) + 1,
value: any = list.getList().slice(
Number(index),
len
);
this.logger.debug(
`Returning element "${value}", "%s"`,
typeof value
);
return RedisToken.string(value);
}
}
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