dce-mango
Version:
Harvard DCE's Non-relational DB Wrapper.
73 lines • 3.3 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.PollingError = void 0;
// Import from NodeJS
const timers = __importStar(require("timers/promises"));
class PollingError extends Error {
constructor(message) {
super(message);
this.name = 'PollingError';
// See SO post: https://stackoverflow.com/a/48342359
// restore prototype chain
const actualProto = new.target.prototype;
Object.setPrototypeOf(this, actualProto);
}
}
exports.PollingError = PollingError;
/**
* Function for polling a given resource.
* @author Benedikt Arnarsson
* @param opts.callResource the function for calling the external resource
* @param opts.validateResult validate that we got the result we want from the resource
* @param opts.waitForMS time between calls to the resource (in milliseconds)
* @param opts.maxAttempts the maximum number of attempts (defaults to 'infinity')
*/
const pollResource = (opts) => __awaiter(void 0, void 0, void 0, function* () {
const { callResource, validateResult, waitForMS, timeOut, } = opts;
for (let t = 0; t <= timeOut; t += waitForMS) {
const result = yield callResource();
if (validateResult(result)) {
return result;
}
yield timers.setTimeout(waitForMS);
}
// FIXME: better error message?
throw new PollingError(`Exceeded timeout of ${timeOut}.
With wait interval of ${waitForMS}.
With polling function:
${callResource.toString()}`);
});
exports.default = pollResource;
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