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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 | 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.
* ### LSET key index element
* Sets the list element at index to element. For more information on the index argument,
* see {@link resp/command/list/lindex-command.LIndexCommand | LINDEX}.
*
* **unit-redisness-test** follows the observed behavior of Redis - if the key does not exist
* then we return 'ERR no such key'
*
* An error is returned for out of range indexes.
*
* ###Return value
* Simple string reply
*/
export class LSetCommand extends IRespCommand {
public DbDataType = DataType.LIST
public maxParams = 3
public minParams = 3
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.`);
return RedisToken.error("ERR no such key");
}
// Validate the index exists. Positive index from ZERO, Negative index from .length
const index: string = request.getParam(1);
this.logger.debug(`Validating list index ${index}`);
if (isNaN(Number(index)) || Math.abs(Number(index)) >= list.getList().length) {
this.logger.debug(`Index ${index} is invalid for ${key}`);
return RedisToken.error("ERR value is not an integer or out of range");
}
const value: string = request.getParam(2);
this.logger.debug(`Setting element ${index} of key ${key} to ${value}`);
list.getList().splice(
Number(index),
1,
value
);
db.put(
key,
list
);
return RedisToken.responseOk();
}
}
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