json-rpc-utils
Version:
JSON-RPC 2.0 client and server utilities
161 lines (160 loc) • 7.86 kB
JavaScript
;
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
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 };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.JSONRPCServer = void 0;
var models_1 = require("./models");
var DefaultErrorCode = 0;
var createMethodNotFoundResponse = function (id) {
return models_1.createJSONRPCErrorResponse(id, models_1.JSONRPCErrorCode.MethodNotFound, "Method not found");
};
var JSONRPCServer = /** @class */ (function () {
function JSONRPCServer(options) {
if (options === void 0) { options = {}; }
this.options = options;
this.nameToMethodDictionary = {};
this.logger = options.logger || null;
}
/**
* Adds a new method to be invoked by remote JSON-RPC clients.
*/
JSONRPCServer.prototype.addMethod = function (name, method) {
var _a;
this.nameToMethodDictionary = __assign(__assign({}, this.nameToMethodDictionary), (_a = {}, _a[name] = this.toJSONRPCMethod(method), _a));
};
/**
* Processes an incoming JSON-RPC request.
*
* Returns an object suitable for JSON serialization with a response if the request merits a response, and returns null if no response is required. Nulls like this happen for JSON-RPC notifications.
*/
JSONRPCServer.prototype.process = function (request, ServerContext) {
var _a;
return __awaiter(this, void 0, void 0, function () {
var message, method, isNotification, response;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (!models_1.isJSONRPCRequest(request)) {
message = "Received an invalid JSON-RPC request";
(_a = this.logger) === null || _a === void 0 ? void 0 : _a.warn(message, request);
throw new Error(message);
}
method = this.nameToMethodDictionary[request.method];
isNotification = typeof request.id === "undefined";
if (!method) {
return [2 /*return*/, isNotification ? null : createMethodNotFoundResponse(request.id)];
}
return [4 /*yield*/, this.callMethod(method, request, ServerContext)];
case 1:
response = _b.sent();
return [2 /*return*/, isNotification ? null : response];
}
});
});
};
JSONRPCServer.prototype.toJSONRPCMethod = function (method) {
var _this = this;
return function (request, ServerContext) { return __awaiter(_this, void 0, void 0, function () {
var result, error_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 2, , 3]);
return [4 /*yield*/, method(request.params, ServerContext)];
case 1:
result = _a.sent();
return [2 /*return*/, mapResultToJSONRPCResponse(request.id, result)];
case 2:
error_1 = _a.sent();
return [2 /*return*/, this.handleErrorAndCreateResponse(request.id, error_1)];
case 3: return [2 /*return*/];
}
});
}); };
};
JSONRPCServer.prototype.callMethod = function (method, request, ServerContext) {
return __awaiter(this, void 0, void 0, function () {
var error_2;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 2, , 3]);
return [4 /*yield*/, method(request, ServerContext)];
case 1: return [2 /*return*/, _a.sent()];
case 2:
error_2 = _a.sent();
return [2 /*return*/, this.handleErrorAndCreateResponse(request.id, error_2)];
case 3: return [2 /*return*/];
}
});
});
};
JSONRPCServer.prototype.handleErrorAndCreateResponse = function (id, error) {
this.options.onError && this.options.onError(error, id);
if (id !== undefined) {
return models_1.createJSONRPCErrorResponse(id, DefaultErrorCode, (error && error.message) || "An unexpected error occurred", this.options.getErrorData ? this.options.getErrorData(error) : undefined);
}
else {
return null;
}
};
return JSONRPCServer;
}());
exports.JSONRPCServer = JSONRPCServer;
var mapResultToJSONRPCResponse = function (id, result) {
if (id !== undefined) {
return {
jsonrpc: models_1.JSONRPCProtocol,
id: id,
result: result === undefined ? null : result,
};
}
else {
return null;
}
};