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/* c8 ignore start */
/**
* The generators epoch timestamp in milliseconds.
*
* Defaults to "1st of January, 2000, 00:00".
*
* @type {number}
*/
/* c8 ignore end */
static EPOCH: number = Date.UTC(1970, 0, 1).valueOf();
/* c8 ignore start */
/**
* The id of the shard running this generator.
*
* Defaults to "1".
*
* @type {number}
*/
/* c8 ignore end */
static SHARD_ID: number = 1;
/* c8 ignore start */
/**
* The sequence of the current running generator.
*
* Defaults to "1".
*
* @type {number}
*/
/* c8 ignore end */
static SEQUENCE: number = 1;
/* c8 ignore start */
/**
* Generates a single snowflake.
* @param {Date|number} [timestamp = Date.now] - Timestamp to generate from
* @returns {bigint}
*/
/* c8 ignore end */
static generate({
timestamp = Date.now(),
shard_id = Snowflake.SHARD_ID,
}: {
timestamp?: Date | number;
shard_id?: number;
} = {}): string {
if (timestamp instanceof Date) timestamp = timestamp.valueOf();
else timestamp = new Date(timestamp).valueOf();
// tslint:disable:no-bitwise
let result = (BigInt(timestamp) - BigInt(Snowflake.EPOCH)) << BigInt(22);
result = result | (BigInt(shard_id % 1024) << BigInt(12));
result = result | BigInt(Snowflake.SEQUENCE++ % 4096);
// tslint:enable:no-bitwise
return result.toString();
}
/**
* Deconstruct a snowflake to its values using the `Generator.epoch`.
* @param {SnowflakeResolvable|SnowflakeResolvable[]} snowflake - Snowflake(s) to deconstruct
* @returns {DeconstructedSnowflake|DeconstructedSnowflake[]}
*/
static parse(snowflake: SnowflakeResolvable): DeconstructedSnowflake {
const binary = Snowflake.binary(snowflake);
return {
timestamp: Snowflake.extractBits(snowflake, 1, 41),
shard_id: Snowflake.extractBits(snowflake, 42, 10),
sequence: Snowflake.extractBits(snowflake, 52),
binary,
};
}
static isValid(snowflake: string) {
if (!/^[\d]{19}$/.test(snowflake)) {
return false;
}
try {
Snowflake.parse(snowflake);
return true;
} catch (e) {
return false;
}
}
/**
* Extract bits and their values from a snowflake.
* @param {SnowflakeResolvable} snowflake - Snowflake to extract from
* @param {number|bigint} shift - Number of bits to shift before extracting
* @param {number|bigint} length - Number of bits to extract before stopping
* @returns {bigint}
*/
static extractBits(
snowflake: SnowflakeResolvable,
start: number,
length?: number
): number {
return parseInt(
length
? Snowflake.binary(snowflake).substring(start, start + length)
: Snowflake.binary(snowflake).substring(start),
2
);
}
/**
* Transform a snowflake into its 64Bit binary string.
* @param {SnowflakeResolvable} snowflake - Snowflake to transform
* @returns {string}
* @private
*/
static binary(snowflake: SnowflakeResolvable): string {
const cached64BitZeros =
"0000000000000000000000000000000000000000000000000000000000000000";
const binValue = BigInt(snowflake).toString(2);
return binValue.length < 64
? cached64BitZeros.substring(0, 64 - binValue.length) + binValue
: binValue;
}
}
/**
* Resolvable value types for a valid Snowflake.
* * string
* * number
* * bigint
* @type {SnowflakeResolvable}
*/
type SnowflakeResolvable = string;
/**
* Interface of a Snowflake after `Generator.deconstruct()`.
* @property {bigint} snowflake - Snowflake deconstructed from
* @property {bigint} timestamp - The timestamp the snowflake was generated
* @property {bigint} shard_id - The shard_id used when generating
* @property {bigint} increment - The increment of this snowflake
* @property {string} binary - The 64Bit snowflake binary string
* @interface DeconstructedSnowflake
*/
interface DeconstructedSnowflake {
timestamp: number;
shard_id: number;
sequence: number;
binary: string;
}
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