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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";
interface IParameters {
ifExists: boolean;
ifNotExists: boolean;
ttl: number | null;
}
/**
* Available (in this form) since v2.6.12
*
* Set key to hold the string value.
* If key already holds a value, it is overwritten,
* regardless of its type.
*
* Any previous time to live associated with the key is discarded on successful SET operation.
*
* EX seconds -- Set the specified expire time, in seconds.
* PX milliseconds -- Set the specified expire time, in milliseconds.
* NX -- Only set the key if it does not already exist.
* XX -- Only set the key if it already exist.
*
* RETURNS:
* Simple string reply:
* OK if SET was executed correctly.
* Null reply: a Null Bulk Reply is returned if the SET operation was not performed
* because the user specified the NX or XX option but the condition was not met.
*
* Note that XX or NX can be specified multiple times without change in behavior
*/
export class SetCommand extends IRespCommand {
public dbDataType = DataType.STRING
public maxParams = 6
public minParams = 2
public name = "set"
private logger: Logger = new Logger(module.id);
public execSync(request: IRequest, db: Database): RedisToken {
this.logger.debug(
`${request.getCommand()}.execute(%s)`,
...request.getParams()
);
try {
const parameters: IParameters = this.parse(request),
key: string = request.getParam(0).toString();
this.logger.debug(
`Creating key ${key} with parameters %s`,
`${parameters}`
);
const value: DatabaseValue = this.parseValue(
request,
parameters
),
savedValue = this.saveValue(
db,
parameters,
key,
value
);
return savedValue && savedValue.toString() === value.toString()
? RedisToken.responseOk()
: RedisToken.nullString();
} catch (ex: any) {
this.logger.warn(
`Exception processing request SET ${request.getParams()}`,
ex
);
return RedisToken.error(ex.message);
}
}
private parse(request: IRequest): IParameters {
const parameters: IParameters = {
"ifExists": false,
"ifNotExists": false,
"ttl": null
};
if (request.getLength() > 2) {
for (let i = 2; i < request.getLength(); i++) {
const option: string = request.getParam(i);
if (this.match(
"EX",
option
)) {
if (parameters.ttl != null) {
throw new Error("ERR syntax error");
}
parameters.ttl = this.parseTtl(
request,
++i
) * 1000;
} else if (this.match(
"PX",
option
)) {
if (parameters.ttl != null) {
throw new Error("ERR syntax error");
}
parameters.ttl = this.parseTtl(
request,
++i
);
} else if (this.match(
"NX",
option
)) {
if (parameters.ifExists) {
throw new Error("ERR syntax error");
}
parameters.ifNotExists = true;
} else if (this.match(
"XX",
option
)) {
if (parameters.ifNotExists) {
throw new Error("ERR syntax error");
}
parameters.ifExists = true;
} else {
throw new Error("ERR syntax error");
}
}
}
return parameters;
}
private match(str: string, option: string): boolean {
return str.toLowerCase() === option.toString().toLowerCase();
}
private parseTtl(request: IRequest, i: number): number {
const ttlOption: string = request.getParam(i),
value: number = parseInt(
ttlOption.toString(),
10
);
if (value < 1) {
throw new Error("ERR invalid expire time in set");
}
return value;
}
private parseValue(request: IRequest, parameters: IParameters): DatabaseValue {
const value: DatabaseValue = new DatabaseValue(
DataType.STRING,
request.getParam(1).toString(),
parameters.ttl
? new Date().getTime() + parameters.ttl
: undefined
);
return value;
}
private saveValue(db: Database, params: IParameters, key: string, value: DatabaseValue): DatabaseValue {
let savedValue: DatabaseValue;
if (params.ifExists) {
savedValue = db.putIfPresent(
key,
value
);
} else if (params.ifNotExists) {
savedValue = db.putIfAbsent(
key,
value
);
} else {
this.logger.debug(`Setting ${util.inspect(key)} to ${util.inspect(value)}`);
savedValue = db.put(
key,
value
);
this.logger.debug(`Returning ${util.inspect(savedValue)}`);
}
return savedValue;
}
}
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