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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 | 1x 1x 1x 1x 1x 8x 8x 8x 8x 8x 4x 4x 4x 4x 4x 4x 4x 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.
* ### LPOP key
* Removes and returns the first element of the list stored at key.
*
* ### Return value
* Bulk string reply: the value of the first element, or nil when key does not exist.
*/
export class LPopCommand extends IRespCommand {
public DbDataType = DataType.LIST
public maxParams = 1
public minParams = 1
public name = "lpop"
protected logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken | Promise<RedisToken> {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
const key: string = request.getParam(0);
return this.process(
request,
db,
key
);
}
protected process(request: IRequest, db: Database, key: string): RedisToken {
const list: DatabaseValue = db.get(key);
this.logger.debug(`Getting list "${key}"`);
Iif (!list) {
this.logger.debug(`LIST ${key} does not exist. Returning NIL`);
return RedisToken.nullString();
}
this.logger.debug(
"BEFORE shift LIST is \"%j",
...list.getList()
);
const result: any = list.getList().shift();
Eif (list.getList().length > 0) {
db.put(
key,
list
);
} else {
db.remove(key);
}
this.logger.debug(`Returning element ${result}`);
return RedisToken.string(result);
}
}
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