@parity/api/lib/transport/jsonRpcBase.js

The Parity Promise-based API library for interfacing with Ethereum over RPC

"use strict";
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity.
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 (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
var JsonRpcEncoder = require('./jsonRpcEncoder');
var Logging = require('../subscriptions').Logging;
var JsonRpcBase = /** @class */ (function (_super) {
    __extends(JsonRpcBase, _super);
    function JsonRpcBase() {
        var _this = _super.call(this) || this;
        _this._debug = false;
        _this._connected = false;
        _this._middlewareList = Promise.resolve([]);
        return _this;
    }
    JsonRpcBase.prototype.addMiddleware = function (Middleware) {
        var _this = this;
        this._middlewareList = Promise
            .all([
            Middleware,
            this._middlewareList
        ])
            .then(function (_a) {
            var Middleware = _a[0], middlewareList = _a[1];
            // Do nothing if `handlerPromise` resolves to a null-y value.
            if (!Middleware) {
                return middlewareList;
            }
            // don't mutate the original array
            return middlewareList.concat([new Middleware(_this)]);
        });
    };
    JsonRpcBase.prototype._wrapSuccessResult = function (result) {
        return {
            id: this._id,
            jsonrpc: '2.0',
            result: result
        };
    };
    JsonRpcBase.prototype._wrapErrorResult = function (error) {
        return {
            id: this._id,
            jsonrpc: '2.0',
            error: {
                code: error.code,
                message: error.text
            }
        };
    };
    JsonRpcBase.prototype.execute = function (method, params) {
        var _this = this;
        return this._middlewareList.then(function (middlewareList) {
            for (var _i = 0, middlewareList_1 = middlewareList; _i < middlewareList_1.length; _i++) {
                var middleware = middlewareList_1[_i];
                var res = middleware.handle(method, params);
                if (res != null) {
                    return Promise
                        .resolve(res)
                        .then(function (res) {
                        var result = _this._wrapSuccessResult(res);
                        var json = _this.encode(method, params);
                        Logging.send(method, params, { json: json, result: result });
                        return res;
                    });
                }
            }
            return _this._execute(method, params);
        });
    };
    JsonRpcBase.prototype._execute = function () {
        throw new Error('Missing implementation of JsonRpcBase#_execute');
    };
    JsonRpcBase.prototype._setConnected = function () {
        if (!this._connected) {
            this._connected = true;
            this.emit('open');
        }
    };
    JsonRpcBase.prototype._setDisconnected = function () {
        if (this._connected) {
            this._connected = false;
            this.emit('close');
        }
    };
    Object.defineProperty(JsonRpcBase.prototype, "isDebug", {
        get: function () {
            return this._debug;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(JsonRpcBase.prototype, "isConnected", {
        get: function () {
            return this._connected;
        },
        enumerable: true,
        configurable: true
    });
    JsonRpcBase.prototype.setDebug = function (flag) {
        this._debug = flag;
    };
    JsonRpcBase.prototype.error = function (error) {
        if (this.isDebug) {
            console.error(error);
        }
    };
    JsonRpcBase.prototype.log = function (log) {
        if (this.isDebug) {
            console.log(log);
        }
    };
    return JsonRpcBase;
}(JsonRpcEncoder));
module.exports = JsonRpcBase;