@tangany/waas
Version:
node.js SDK for Tangany Wallet as a Service API
101 lines • 6.75 kB
JavaScript
;
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());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.poll = void 0;
var errors_1 = require("../errors");
/**
* Executes the passed function until the defined result occurs or the timeout is exceeded.
* @param fn - Function that executes the polling logic (for example, an API call)
* @param validationFn - Function that defines which result of a polling call should lead to the end of polling
* @param description - Summary of the polling activity for the error message on timeout (e.g. "request 12345")
* @param timeout - Limit value after which polling is aborted (in ms)
* @param pollingInterval - Delay between the individual polling calls (in ms)
*/
function poll(fn, validationFn, description, timeout, pollingInterval) {
return __awaiter(this, void 0, void 0, function () {
var _this = this;
return __generator(this, function (_a) {
// We need a timeout that stops polling when the defined threshold is exceeded. Thus there must be a callback in which
// a TimeoutError is to be thrown. So it is not enough that async methods automatically create a promise based on
// the return and throw statements. A throw in such a callback would not reject the promise and instead lead to an unhandled rejection.
// Therefore we create our own promise and consciously call resolve/reject.
return [2 /*return*/, new Promise(function (resolve, reject) { return __awaiter(_this, void 0, void 0, function () {
var globalTimeout, intervalTimer;
var _this = this;
return __generator(this, function (_a) {
globalTimeout = setTimeout(function () {
// If the global timeout expires before the expected result has been obtained by polling, it is very important
// to clear the polling interval manually. Otherwise the process will not terminate.
clearInterval(intervalTimer);
return reject(new errors_1.TimeoutError("Timeout when retrieving information for ".concat(description)));
}, timeout);
intervalTimer = setInterval(function () { return __awaiter(_this, void 0, void 0, function () {
var response, e_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 2, , 3]);
return [4 /*yield*/, fn()];
case 1:
response = _a.sent();
if (validationFn(response)) {
// If the global timeout has not been exceeded, it must be cleared manually to prevent a non-terminating process.
clearTimeout(globalTimeout);
// Despite the return statement, it seems that the interval must also be clarified manually to avoid further iterations.
clearInterval(intervalTimer);
return [2 /*return*/, resolve(response)];
}
return [3 /*break*/, 3];
case 2:
e_1 = _a.sent();
// clear all timers before rejecting
clearTimeout(globalTimeout);
clearInterval(intervalTimer);
return [2 /*return*/, reject(e_1)];
case 3: return [2 /*return*/];
}
});
}); }, pollingInterval);
return [2 /*return*/];
});
}); })];
});
});
}
exports.poll = poll;
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