redis-rank
Version:
Manage real-time leaderboards using Redis
71 lines (70 loc) • 2.71 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
if (typeof b !== "function" && b !== null)
throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
var stream_1 = require("stream");
/**
* A readable stream that iterates all entries in a leaderboard in batches
*
* Note that the stream guarantees to traverse all entries only if there
* are no updates during retrival
*/
var ExportStream = /** @class */ (function (_super) {
__extends(ExportStream, _super);
function ExportStream(options) {
var _this = _super.call(this, __assign(__assign({}, options), { objectMode: true })) || this;
_this.options = options;
_this._Index = 1;
_this._Done = false;
return _this;
}
ExportStream.prototype._read = function () {
var _this = this;
if (this._Done) {
this.push(null);
return;
}
this.options.leaderboard.list(this._Index, this._Index + this.options.batchSize - 1).then(function (entries) {
if (entries.length < _this.options.batchSize) {
// finished
_this._Done = true;
if (entries.length === 0) {
_this.push(null);
return;
}
}
_this._Index += _this.options.batchSize;
_this.push(entries);
}).catch(function (err) { return _this.emit('error', err); });
};
ExportStream.prototype._destroy = function (_error, callback) {
this._Done = true;
callback();
};
return ExportStream;
}(stream_1.Readable));
exports.default = ExportStream;