@parity/light.js
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A high-level reactive JS library optimized for light clients
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JavaScript
;
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity.
//
// SPDX-License-Identifier: MIT
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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) : new P(function (resolve) { resolve(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 };
}
};
var _this = this;
Object.defineProperty(exports, "__esModule", { value: true });
var createPubsubObservable_1 = require("./createPubsubObservable");
var isObservable_1 = require("../../utils/isObservable");
var mockApi_1 = require("../../utils/testHelpers/mockApi");
var api_1 = require("../../api");
var sleep_1 = require("../../utils/testHelpers/sleep");
// Nota: 'it' blocks are run sequentially. However, there is no guarantee as to
// the execution order of the rest of the body of the 'describe' blocks.
it('should return an Observable', function () {
api_1.setApi(mockApi_1.resolveApi());
expect(isObservable_1.default(createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber'))).toBe(true);
});
it('should fire an event when pubsub publishes', function (done) {
api_1.setApi(mockApi_1.resolveApi());
createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber').subscribe(function (data) {
expect(data).toBe('foo');
done();
});
});
it('should fire an error when pubsub errors', function (done) {
api_1.setApi(mockApi_1.rejectApi());
createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber').subscribe(undefined, function (err) {
expect(err).toEqual(new Error('bar'));
done();
});
});
it('should fire an event when polling pubsub publishes', function (done) {
api_1.setApi(mockApi_1.resolveApi('foo', false));
createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber').subscribe(function (data) {
expect(data).toBe('foo');
done();
});
});
it('should fire an error when polling pubsub errors', function (done) {
api_1.setApi(mockApi_1.rejectApi(new Error('bar'), false));
createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber').subscribe(undefined, function (err) {
expect(err).toEqual(new Error('bar'));
done();
});
});
it('should fire an error when polling pubsub errors', function (done) {
api_1.setApi(mockApi_1.rejectApi(new Error('bar'), false));
createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber').subscribe(undefined, function (err) {
expect(err).toEqual(new Error('bar'));
done();
});
});
describe('should manage polling sparingly', function () {
var called = 0;
var initial$ = createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber');
var copy$ = createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber');
var sub1received = [];
var sub2Received = [];
var sub1;
var sub2;
it('should defer polling subscription', function () { return __awaiter(_this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, sleep_1.default(50)];
case 1:
_a.sent();
expect(called).toBe(0);
return [2 /*return*/];
}
});
}); });
it('should emit values and re-emit previous value on observable subscription', function () { return __awaiter(_this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
api_1.setApi(mockApi_1.resolveApi(function () {
return called++;
}, false));
sub1 = initial$.subscribe(function (i) {
sub1received.push(i);
});
return [4 /*yield*/, sleep_1.default(createPubsubObservable_1.POLL_INTERVAL - 5)];
case 1:
_a.sent();
sub2 = copy$.subscribe(function (i) {
sub2Received.push(i);
});
return [4 /*yield*/, sleep_1.default(10)];
case 2:
_a.sent();
expect(sub1received).toEqual([0, 1]);
expect(sub2Received).toEqual([0, 1]);
return [2 /*return*/];
}
});
}); });
it('should unsubscribe', function () { return __awaiter(_this, void 0, void 0, function () {
var previousCalled;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
sub1.unsubscribe();
sub2.unsubscribe();
return [4 /*yield*/, sleep_1.default(createPubsubObservable_1.UNSUB_DELAY)];
case 1:
_a.sent();
previousCalled = called;
return [4 /*yield*/, sleep_1.default(createPubsubObservable_1.POLL_INTERVAL + 5)];
case 2:
_a.sent();
expect(called).toBe(previousCalled);
return [2 /*return*/];
}
});
}); });
});
describe('should manage pubsub connection sparingly', function () {
var blockNumber = 10442873;
var api = {
isPubSub: true,
pubsub: {
eth: {
blockNumber: function (next) { return __awaiter(_this, void 0, void 0, function () {
return __generator(this, function (_a) {
// eslint-disable-next-line @typescript-eslint/no-use-before-define
expect(subscription).not.toBeUndefined();
next(null, blockNumber++);
return [2 /*return*/, 5];
});
}); }
},
unsubscribe: function (_subscriptionId) { }
}
};
var pubsubUnsubSpy = jest.spyOn(api.pubsub, 'unsubscribe');
var obs;
var subscription;
it('should defer pubsub subscription', function (done) { return __awaiter(_this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
obs = createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber');
return [4 /*yield*/, sleep_1.default(500)];
case 1:
_a.sent();
api_1.setApi(api);
subscription = obs.subscribe(function (n) {
expect(n).toBe(10442873);
done();
});
return [2 /*return*/];
}
});
}); });
it('should delay pubsub unsubscription', function () { return __awaiter(_this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
subscription.unsubscribe();
return [4 /*yield*/, sleep_1.default(createPubsubObservable_1.UNSUB_DELAY - 5)];
case 1:
_a.sent();
expect(pubsubUnsubSpy).toHaveBeenCalledTimes(0);
return [4 /*yield*/, sleep_1.default(10)];
case 2:
_a.sent();
expect(pubsubUnsubSpy).toHaveBeenCalled();
return [2 /*return*/];
}
});
}); });
it('should re-emit previous value on observable subscription', function () { return __awaiter(_this, void 0, void 0, function () {
var values;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
values = [];
subscription = obs.subscribe(function (x) { return values.push(x); });
return [4 /*yield*/, sleep_1.default(5)];
case 1:
_a.sent();
expect(values).toEqual([10442873, 10442874]);
return [2 /*return*/];
}
});
}); });
it('should re-use the same pubsub when used twice', function () { return __awaiter(_this, void 0, void 0, function () {
var obs2, values;
return __generator(this, function (_a) {
obs2 = createPubsubObservable_1.default('eth_blockNumber', 'eth_blockNumber');
values = [];
obs2.subscribe(function (x) { return values.push(x); });
expect(values).toEqual([10442874]);
return [2 /*return*/];
});
}); });
});