@parity/light.js/lib/frequency/blocks.js

A high-level reactive JS library optimized for light clients

"use strict";
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity.
//
// SPDX-License-Identifier: MIT
Object.defineProperty(exports, "__esModule", { value: true });
var operators_1 = require("rxjs/operators");
var memoizee = require("memoizee");
var api_1 = require("../api");
var createPubsubObservable_1 = require("./utils/createPubsubObservable");
var operators_2 = require("../utils/operators");
var health_1 = require("./health");
/**
 * Pure function version of {@link onEveryBlock$}.
 *
 * @ignore
 */
var onEveryBlockWithApi$ = memoizee(function (api, options) {
    return createPubsubObservable_1.default('eth_newHeads', 'eth_getBlockByNumber', options).pipe(operators_1.withLatestFrom(health_1.onSyncingChanged$(options).pipe(operators_1.startWith(false))), operators_1.filter(function (_a) {
        var _ = _a[0], isSyncing = _a[1];
        return isSyncing === false;
    }), operators_1.map(function (_a) {
        var blockNumber = _a[0];
        return blockNumber;
    }), operators_2.distinctValues());
}, { length: 1 } // Only memoize by api
);
/**
 * Observable that emits on every new block. Note: this FrequencyObservable
 * won't fire when the light client is syncing.
 *
 * @param options - Options to pass to {@link FrequencyObservable}.
 */
function onEveryBlock$(options) {
    var api = options && options.provider
        ? api_1.createApiFromProvider(options.provider)
        : api_1.getApi();
    return onEveryBlockWithApi$(api, options);
}
exports.onEveryBlock$ = onEveryBlock$;