rpc-websocketserver
Version:
Simple rpc websocket server, wrapping the very popular 'ws' library. Register your RPCs with convenient decorators.
142 lines • 7.01 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 utils_1 = require("../utils");
var constants_1 = require("../constants");
/**
* Minimalist message handler
*
* - Incoming messages must be of type string or Buffer
* - After reading the string or Buffer, the RPC must be an object
* - The object must have the "method" key
* - The value of the "method" field must be of type string
* - The object can have the "params" key (it can also be omitted)
* <br/>
*
* @implements {MessageHandler}
*
* @example Valid message with positional parameters
* {
* "method": "sum",
* "params": [1, 2]
* }
* @example Valid message with named parameters
* {
* "method": "sum",
* "params": { "b": 1, "a": 2 }
* }
* @example Valid message with named parameters omitted
* {
* "method": "sum"
* }
*/
var SimpleMessageHandler = /** @class */ (function () {
function SimpleMessageHandler() {
}
/**
* Handles an incoming message
*
* @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
*/
SimpleMessageHandler.prototype.handle = function (message, registeredMethods) {
var handlerResult = { error: true, data: undefined, func: constants_1.NOOP, args: [] };
try {
var request = utils_1.validateAndParseMessage(message, Error);
utils_1.assertValidRequest(request, Error);
var method = utils_1.validateMethod(request.method, registeredMethods, Error);
handlerResult.args = utils_1.validateParams(request === null || request === void 0 ? void 0 : request.params, method.params, Error);
handlerResult.func = method.func;
handlerResult.error = false;
}
catch (err) {
handlerResult.data = err.message;
}
return handlerResult;
};
/**
* Function to process handler result. Should call rpc and return data to be sent to clients
*
* @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>}
*/
SimpleMessageHandler.prototype.process = function (context, handlerResult) {
return __awaiter(this, void 0, void 0, function () {
var error, data, func, args, response, err_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
error = handlerResult.error, data = handlerResult.data, func = handlerResult.func, args = handlerResult.args;
if (!!error) return [3 /*break*/, 5];
_a.label = 1;
case 1:
_a.trys.push([1, 3, , 4]);
return [4 /*yield*/, func.call.apply(func, __spreadArrays([context], args))];
case 2:
response = _a.sent();
return [3 /*break*/, 4];
case 3:
err_1 = _a.sent();
console.log(err_1);
response = 'Internal server error';
return [3 /*break*/, 4];
case 4: return [3 /*break*/, 6];
case 5:
response = data;
_a.label = 6;
case 6:
if (response && typeof response !== 'string')
response = JSON.stringify(response);
return [2 /*return*/, response];
}
});
});
};
return SimpleMessageHandler;
}());
exports.default = SimpleMessageHandler;
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