delphirtl
Version:
RTL functions from Delphi
451 lines • 26.7 kB
JavaScript
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.CNoContent = exports.SParseError = exports.SMethodNotFound = exports.SInvalidRequest = exports.SInvalidParams = exports.SEntityParseFailed = exports.JSONRPCServer = exports.JSONRPCClient = exports.JSONRPC = exports.JSONRPCErrorException = exports.JSONRPCErrorCode = exports.isJSONRPCID = exports.createJSONRPCErrorResponse = exports.BaseJsonRpcServer = void 0;
const json_rpc_2_0_1 = require("json-rpc-2.0");
Object.defineProperty(exports, "createJSONRPCErrorResponse", { enumerable: true, get: function () { return json_rpc_2_0_1.createJSONRPCErrorResponse; } });
Object.defineProperty(exports, "isJSONRPCID", { enumerable: true, get: function () { return json_rpc_2_0_1.isJSONRPCID; } });
Object.defineProperty(exports, "JSONRPC", { enumerable: true, get: function () { return json_rpc_2_0_1.JSONRPC; } });
Object.defineProperty(exports, "JSONRPCClient", { enumerable: true, get: function () { return json_rpc_2_0_1.JSONRPCClient; } });
Object.defineProperty(exports, "JSONRPCErrorCode", { enumerable: true, get: function () { return json_rpc_2_0_1.JSONRPCErrorCode; } });
Object.defineProperty(exports, "JSONRPCErrorException", { enumerable: true, get: function () { return json_rpc_2_0_1.JSONRPCErrorException; } });
Object.defineProperty(exports, "JSONRPCServer", { enumerable: true, get: function () { return json_rpc_2_0_1.JSONRPCServer; } });
const express_1 = __importDefault(require("express"));
const http_terminator_1 = require("http-terminator");
const rtl_1 = require("./rtl");
/**
* Invalid params
*
* @type {"Invalid params"}
* @category Constants
*/
const SInvalidParams = "Invalid params";
exports.SInvalidParams = SInvalidParams;
/**
* Invalid request
*
* @type {"Invalid Request"}
* @category Constants
*/
const SInvalidRequest = "Invalid Request";
exports.SInvalidRequest = SInvalidRequest;
/**
* Method not found
*
* @type {"Method not found"}
* @category Constants
*/
const SMethodNotFound = "Method not found";
exports.SMethodNotFound = SMethodNotFound;
/**
* Parse error
*
* @type {"Parse error"}
* @category Constants
*/
const SParseError = "Parse error";
exports.SParseError = SParseError;
/**
* Entity parse failed
*
* @type {"entity.parse.failed"}
* @category Constants
*/
const SEntityParseFailed = "entity.parse.failed";
exports.SEntityParseFailed = SEntityParseFailed;
/**
* No content
*
* @type {204}
* @category Constants
*/
const CNoContent = 204;
exports.CNoContent = CNoContent;
/**
* Default port
*
* @type {8080}
* @category Constants
*/
const CDefaultPort = 8080;
/**
* String
*
* @type {"string"}
* @category Constants
*/
const CString = "string";
/**
* Powered by
*
* @type {"x-powered-by"}
* @category Constants
*/
const CXPoweredBy = "x-powered-by";
/**
* This is a JSON RPC server that conforms to the JSON RPC 2.0 spec as documented at https://www.jsonrpc.org/specification
*
* @class BaseJsonRpcServer
* @typedef {BaseJsonRpcServer}
* @category JSON RPC
*/
class BaseJsonRpcServer {
/**
* Constructs a BaseJsonRpcServer server and returns it.
* Listens on localhost:8080 by default, on both IPv4 and IPv6
* To listen only on IPv4, override onBeforeListening and call dns.setDefaultResultOrder('ipv4first');
* To listen only on IPv6, if both IPv4 and IPv6 is enabled, just pass "localhost" to the host parameter
*
* @param {string} [host="::"] The IP address/hostname to listen on
* @param {number} [port=CDefaultPort] The port number to listen on
* @returns {BaseJsonRpcServer} BaseJsonRpcServer
*/
constructor(host = "::", port = CDefaultPort) {
this.mListeningHost = host;
this.mListeningPort = port;
this.mJsonRpcServer = this.initJsonRpcServer();
this.mExpressServer = this.initExpress();
this.afterConstruction();
}
/**
* Adds all necessary JSON RPC methods to this.mJsonRpcServer
*/
addRPCMethods() {
const methods = this.implementedRPCMethods();
for (const method of methods) {
const name = method.name;
if (this.mJsonRpcServer.hasMethod(name)) {
continue;
}
const boundMethod = method.bind(this);
this.mJsonRpcServer.addMethod(name, boundMethod);
}
;
this.logListeningMethods(methods);
}
/**
* Allows descendants to do something after class construction
*
* @returns {void} void
*/
afterConstruction() {
}
/**
* Creates an Invalid Params JSON RPC Error exception, with the given message.
* The caller must throw the return of this call.
*
* @returns {string} Invalid Params JSON RPC Error exception
*/
createInvalidParamsMessage(message, data) {
const error = new json_rpc_2_0_1.JSONRPCErrorException(message, json_rpc_2_0_1.JSONRPCErrorCode.InvalidParams, data);
return error;
}
/**
* Creates an Invalid Params JSON RPC Error exception, with the message as Invalid Params.
* The caller must throw the return of this call.
*
* @returns {string} Invalid Params JSON RPC Error exception
*/
createInvalidParams(data) {
const error = this.createInvalidParamsMessage(SInvalidParams, data);
return error;
}
/**
* Creates an Invalid Request JSON RPC Error response.
*
* @returns {string} Invalid Params JSON RPC response
*/
createInvalidRequestResponse(request) {
const response = (0, json_rpc_2_0_1.createJSONRPCErrorResponse)((0, json_rpc_2_0_1.isJSONRPCID)(request.id) ? request.id : null, json_rpc_2_0_1.JSONRPCErrorCode.InvalidRequest, SInvalidRequest);
return response;
}
/**
* Creates a Method not found JSON RPC Error response, with the message as Invalid Params.
* The caller must throw the return of this call.
*
* @returns {string} Invalid Request JSON RPC Error exception
*/
createMethodNotFoundResponse(request) {
const error = new json_rpc_2_0_1.JSONRPCErrorException(SMethodNotFound, json_rpc_2_0_1.JSONRPCErrorCode.MethodNotFound);
return error;
}
/**
* Creates an Invalid Request JSON RPC Error exception, with the message as Invalid Params.
* The caller must throw the return of this call.
*
* @returns {string} Invalid Request JSON RPC Error exception
*/
createInvalidRequest(data) {
const error = new json_rpc_2_0_1.JSONRPCErrorException(SInvalidRequest, json_rpc_2_0_1.JSONRPCErrorCode.InvalidRequest, data);
return error;
}
/**
* Calls this.onParseError
* If onParseError doesn't handle the error, doParseError will send a JSON RPC Error response
* if the error is a parsing error, or pass the error up to the next middleware to handle
*
* @returns {string} Invalid Request JSON RPC Error exception
*/
doParseError(err, req, res, next) {
let handled = false;
// creates a custom response with a send function
// if the send function is called, sets the handled flag
const response = {
send: (body) => {
handled = true;
res.send(body);
}
};
this.mResponse = undefined; // prevents mResponse from being used by overridden onParseError methods
this.onParseError(err, req, response);
// if this is not set, we'll know that onParseError didn't call it, so we should handle it
if (!handled) {
// this entity.parse.failed constant is used/sent by Express
if (err.type === SEntityParseFailed) {
const obj = (0, json_rpc_2_0_1.createJSONRPCErrorResponse)(null, json_rpc_2_0_1.JSONRPCErrorCode.ParseError, SParseError);
res.send(obj);
}
else {
next(err);
}
}
}
/**
* Handles a single or a batch JSON RPC request.
*
* @returns {void}
*/
async handleRequest(request, response) {
try {
const temp = request.body;
// checks that the request body fits a JSON RPC call
const isBatch = Array.isArray(temp);
if (isBatch && (temp.length === 0)) {
response.send(this.createInvalidRequestResponse(request));
return;
}
const jsonRpcResponse = await this.mJsonRpcServer.receive(request.body);
if (jsonRpcResponse) {
response.send(jsonRpcResponse);
}
else {
switch (isBatch) {
case false: {
if (typeof request.body.method != CString) {
response.send(this.createInvalidRequestResponse(request));
break;
}
response.sendStatus(CNoContent);
break;
}
case true: {
response.send({}); // empty response for a notification
}
}
}
}
catch (e) {
const error = (0, json_rpc_2_0_1.createJSONRPCErrorResponse)((0, json_rpc_2_0_1.isJSONRPCID)(request.body.id) ? request.body.id : null, json_rpc_2_0_1.JSONRPCErrorCode.InvalidRequest, SInvalidRequest);
response.send(error);
}
}
/**
* Returns RPC methods implemented by the server
* Override to return an array of RPC methods implemented.
* @returns {SimpleJSONRPCMethod<void>[]} array of RPC methods implemented
*/
implementedRPCMethods() {
return [this.echo];
}
/**
* Initializes the Express server and returns it
*
* @returns {Express}
*/
initExpress() {
const result = (0, express_1.default)();
result.disable(CXPoweredBy); // removes the X-Powered-By header
result.use(express_1.default.json());
this.initParseErrorHandler(result);
result.post(this.listeningPath, async (request, response) => {
this.mResponse = response;
this.mRequest = request;
try {
await this.handleRequest(request, response);
}
finally {
// @ts-ignore
this.mRequest = undefined;
// @ts-ignore
this.mResponse = undefined;
}
});
return result;
}
/**
* Initializes the JSON RPC server and returns it
*
* @returns {JSONRPCServer}
*/
initJsonRpcServer() {
const result = new json_rpc_2_0_1.JSONRPCServer({ errorListener: this.JsonRpcErrorListener.bind(this) });
const checkRequest = (next, request, serverParams) => {
return this.onBeforeDispatchRequest(next, request, serverParams);
};
result.applyMiddleware(checkRequest);
return result;
}
/**
* Returns a JSON parse error during express.json parsing
*
* @returns {void}
*/
initParseErrorHandler(aExpress) {
const parseErrorHandler = (err, req, res, next) => {
this.doParseError(err, req, res, next);
};
aExpress.use(parseErrorHandler);
}
/**
* Error listener for JSON RPC, override to handle.
* Called when an error occurred during the JSON RPC method call.
* Do not throw an exception within this method
*
* @returns {void}
*/
JsonRpcErrorListener(message, data) {
}
/**
* Starts listening for RPC requests
*/
async listen(port) {
this.addRPCMethods();
switch (typeof port) {
case "undefined": {
port = this.mListeningPort;
break;
}
}
this.onBeforeListening();
this.mServer = this.mExpressServer.listen(port, this.mListeningHost, () => {
this.log(`Listening on port: ${port}`);
});
this.mHttpTerminator = (0, http_terminator_1.createHttpTerminator)({ server: this.mServer });
await this.waitForServerListening();
}
/**
* Returns the path on which to listen to requests for. Override to listen on another path.
*
* @returns {string} path on which to listen to requests for
*/
get listeningPath() {
return "/json-rpc/";
}
log(message, ...optionalParams) {
console.log(message, ...optionalParams);
}
/**
* Displays the JSON RPC methods being listened to
*/
logListeningMethods(methods) {
this.log("Listening for these JSON RPC methods:");
for (const method of methods) {
this.log(method.name);
}
}
/**
* Called before every valid JSON body is dispatched, this doesn't mean that the request is a valid JSON RPC call though.
* If the request is valid, the method should call next(request, serverParams) and return its result.
* If the request is invalid, it should throw an appropriate error.
*
* @returns {JSONRPCResponsePromise}
*/
onBeforeDispatchRequest(next, request, serverParams) {
switch (typeof request.method) {
case CString: {
return next(request, serverParams);
}
default: {
throw this.createInvalidRequestResponse(request);
}
}
}
/**
* This is called before the JSON RPC server starts listening on the port
* Override this, for example, to listen just on IPv4 by calling dns.setDefaultResultOrder('ipv4first');
*/
onBeforeListening() {
}
/**
* Called when there's a parsing error. The overridden method should create a JSON RPC Error response and
* send it using response.send(err_response)
* If the error is not handled, this class will return an error
*
* @returns {void}
*/
onParseError(err, request, response) {
}
/**
* Creates an Invalid Request JSON RPC Error exception and sends it.
*
* @returns {}
*/
sendInvalidRequest(data) {
const error = this.createInvalidRequest(data);
this.mResponse?.send(error);
}
/**
* Creates an Invalid Params JSON RPC Error exception and sends it.
*
* @returns {}
*/
sendInvalidParams(data) {
const error = this.createInvalidParams(data);
this.mResponse?.send(error);
}
/**
* Stops the RPC server. This can be called by a RPC call or by the app itself
*/
async stop() {
await this.stopListening();
this.log("Stop listening...");
}
async stopListening() {
await this.mHttpTerminator?.terminate();
this.mServer.close();
await this.waitForServerStopListening();
}
;
/**
* Waits for the server to starts listening before returning.
* Override to disable this
*/
async waitForServerListening() {
let listenAddr = null;
do {
listenAddr = this.mServer.address();
await (0, rtl_1.sleep)(100);
} while (listenAddr === null);
}
async waitForServerStopListening() {
let listenAddr = null;
do {
listenAddr = this.mServer.address();
if (listenAddr !== null) {
await (0, rtl_1.sleep)(100);
}
} while (listenAddr !== null);
}
echo(params) {
return params;
}
}
exports.BaseJsonRpcServer = BaseJsonRpcServer;
/*
Chee-Wee Chua,
Nov 2022,
Singapore
*/
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