rpc-websocketserver
Version:
Simple rpc websocket server, wrapping the very popular 'ws' library. Register your RPCs with convenient decorators.
136 lines • 7.42 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 };
}
};
var __spreadArrays = (this && this.__spreadArrays) || function () {
for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
for (var r = Array(s), k = 0, i = 0; i < il; i++)
for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
r[k] = a[j];
return r;
};
Object.defineProperty(exports, "__esModule", { value: true });
var constants_1 = require("../constants");
var utils_1 = require("../utils");
var utils_2 = require("../json-rpc-2/utils");
var errors_1 = require("../json-rpc-2/errors");
/**
* JSON RPC 2 conform message handler
*
* @implements {MessageHandler}
*/
var JSONRPC2MessageHandler = /** @class */ (function () {
function JSONRPC2MessageHandler() {
}
/**
* Handles an incoming message conforming to the JSON RPC 2 protocol
*
* @param message {string | Buffer} - message to be parsed, validated and evaluated
* @param registeredMethods {Map<string, Method>} - registered namespace methods
* @returns {HandlerResult} - result object to be processed
*/
JSONRPC2MessageHandler.prototype.handle = function (message, registeredMethods) {
var res = {
error: true,
data: {},
func: constants_1.NOOP,
args: [],
};
try {
var request = utils_1.validateAndParseMessage(message, errors_1.ParseError);
utils_2.assertValidJSONRPC2Request(request, errors_1.InvalidRequest);
if (Object(request).hasOwnProperty('id'))
res.data.requestId = request.id;
var method = utils_1.validateMethod(request.method, registeredMethods, errors_1.InvalidMethod);
res.func = method.func;
res.args = utils_1.validateParams(request === null || request === void 0 ? void 0 : request.params, method.params, errors_1.InvalidParams);
res.error = false;
}
catch (err) {
// set json rpc 2 error as res
res.data.errorDetails = err === null || err === void 0 ? void 0 : err.object;
}
return res;
};
/**
* Function to process handler result. Should call rpc and return a JSON RPC 2 conform response
*
* @param context {any} - context of the calling class to properly handle 'this' in the function call
* @param handlerResult {HandlerResult} - handler result from same message handler
* @returns {Promise<WebSocket.Data | undefined>}
*/
JSONRPC2MessageHandler.prototype.process = function (context, handlerResult) {
var _a;
return __awaiter(this, void 0, void 0, function () {
var error, data, func, args, isNotification, requestId, jsonRpc2Response, executionResult, err_1;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
error = handlerResult.error, data = handlerResult.data, func = handlerResult.func, args = handlerResult.args;
isNotification = !data.hasOwnProperty('requestId');
requestId = (_a = handlerResult.data.requestId) !== null && _a !== void 0 ? _a : null;
if (!!error) return [3 /*break*/, 5];
_b.label = 1;
case 1:
_b.trys.push([1, 3, , 4]);
return [4 /*yield*/, func.call.apply(func, __spreadArrays([context], args))];
case 2:
executionResult = _b.sent();
// only build response if request wasn't a notification
if (!isNotification)
jsonRpc2Response = utils_2.buildResponse(false, requestId, executionResult);
return [3 /*break*/, 4];
case 3:
err_1 = _b.sent();
// catch internal server error on execution failure + build json rpc 2 response
jsonRpc2Response = utils_2.buildResponse(true, requestId, new errors_1.InternalError().object);
return [3 /*break*/, 4];
case 4: return [3 /*break*/, 6];
case 5:
jsonRpc2Response = utils_2.buildResponse(true, requestId, data.errorDetails);
_b.label = 6;
case 6:
if (jsonRpc2Response)
jsonRpc2Response = JSON.stringify(jsonRpc2Response);
return [2 /*return*/, jsonRpc2Response];
}
});
});
};
return JSONRPC2MessageHandler;
}());
exports.default = JSONRPC2MessageHandler;
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