"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.JsonRpcEngine = void 0;
const safe_event_emitter_1 = __importDefault(require("@metamask/safe-event-emitter"));
const eth_rpc_errors_1 = require("eth-rpc-errors");
/**
* A JSON-RPC request and response processor.
* Give it a stack of middleware, pass it requests, and get back responses.
*/
class JsonRpcEngine extends safe_event_emitter_1.default {
constructor() {
super();
this._middleware = [];
}
/**
* Add a middleware function to the engine's middleware stack.
*
* @param middleware - The middleware function to add.
*/
push(middleware) {
this._middleware.push(middleware);
}
handle(req, cb) {
if (cb && typeof cb !== 'function') {
throw new Error('"callback" must be a function if provided.');
}
if (Array.isArray(req)) {
if (cb) {
return this._handleBatch(req, cb);
}
return this._handleBatch(req);
}
if (cb) {
return this._handle(req, cb);
}
return this._promiseHandle(req);
}
/**
* Returns this engine as a middleware function that can be pushed to other
* engines.
*
* @returns This engine as a middleware function.
*/
asMiddleware() {
return async (req, res, next, end) => {
try {
const [middlewareError, isComplete, returnHandlers,] = await JsonRpcEngine._runAllMiddleware(req, res, this._middleware);
if (isComplete) {
await JsonRpcEngine._runReturnHandlers(returnHandlers);
return end(middlewareError);
}
return next(async (handlerCallback) => {
try {
await JsonRpcEngine._runReturnHandlers(returnHandlers);
}
catch (error) {
return handlerCallback(error);
}
return handlerCallback();
});
}
catch (error) {
return end(error);
}
};
}
async _handleBatch(reqs, cb) {
// The order here is important
try {
// 2. Wait for all requests to finish, or throw on some kind of fatal
// error
const responses = await Promise.all(
// 1. Begin executing each request in the order received
reqs.map(this._promiseHandle.bind(this)));
// 3. Return batch response
if (cb) {
return cb(null, responses);
}
return responses;
}
catch (error) {
if (cb) {
return cb(error);
}
throw error;
}
}
/**
* A promise-wrapped _handle.
*/
_promiseHandle(req) {
return new Promise((resolve) => {
this._handle(req, (_err, res) => {
// There will always be a response, and it will always have any error
// that is caught and propagated.
resolve(res);
});
});
}
/**
* Ensures that the request object is valid, processes it, and passes any
* error and the response object to the given callback.
*
* Does not reject.
*/
async _handle(callerReq, cb) {
if (!callerReq ||
Array.isArray(callerReq) ||
typeof callerReq !== 'object') {
const error = new eth_rpc_errors_1.EthereumRpcError(eth_rpc_errors_1.errorCodes.rpc.invalidRequest, `Requests must be plain objects. Received: ${typeof callerReq}`, { request: callerReq });
return cb(error, { id: undefined, jsonrpc: '2.0', error });
}
if (typeof callerReq.method !== 'string') {
const error = new eth_rpc_errors_1.EthereumRpcError(eth_rpc_errors_1.errorCodes.rpc.invalidRequest, `Must specify a string method. Received: ${typeof callerReq.method}`, { request: callerReq });
return cb(error, { id: callerReq.id, jsonrpc: '2.0', error });
}
const req = Object.assign({}, callerReq);
const res = {
id: req.id,
jsonrpc: req.jsonrpc,
};
let error = null;
try {
await this._processRequest(req, res);
}
catch (_error) {
// A request handler error, a re-thrown middleware error, or something
// unexpected.
error = _error;
}
if (error) {
// Ensure no result is present on an errored response
delete res.result;
if (!res.error) {
res.error = eth_rpc_errors_1.serializeError(error);
}
}
return cb(error, res);
}
/**
* For the given request and response, runs all middleware and their return
* handlers, if any, and ensures that internal request processing semantics
* are satisfied.
*/
async _processRequest(req, res) {
const [error, isComplete, returnHandlers,] = await JsonRpcEngine._runAllMiddleware(req, res, this._middleware);
// Throw if "end" was not called, or if the response has neither a result
// nor an error.
JsonRpcEngine._checkForCompletion(req, res, isComplete);
// The return handlers should run even if an error was encountered during
// middleware processing.
await JsonRpcEngine._runReturnHandlers(returnHandlers);
// Now we re-throw the middleware processing error, if any, to catch it
// further up the call chain.
if (error) {
throw error;
}
}
/**
* Serially executes the given stack of middleware.
*
* @returns An array of any error encountered during middleware execution,
* a boolean indicating whether the request was completed, and an array of
* middleware-defined return handlers.
*/
static async _runAllMiddleware(req, res, middlewareStack) {
const returnHandlers = [];
let error = null;
let isComplete = false;
// Go down stack of middleware, call and collect optional returnHandlers
for (const middleware of middlewareStack) {
[error, isComplete] = await JsonRpcEngine._runMiddleware(req, res, middleware, returnHandlers);
if (isComplete) {
break;
}
}
return [error, isComplete, returnHandlers.reverse()];
}
/**
* Runs an individual middleware.
*
* @returns An array of any error encountered during middleware exection,
* and a boolean indicating whether the request should end.
*/
static _runMiddleware(req, res, middleware, returnHandlers) {
return new Promise((resolve) => {
const end = (err) => {
const error = err || res.error;
if (error) {
res.error = eth_rpc_errors_1.serializeError(error);
}
// True indicates that the request should end
resolve([error, true]);
};
const next = (returnHandler) => {
if (res.error) {
end(res.error);
}
else {
if (returnHandler) {
if (typeof returnHandler !== 'function') {
end(new eth_rpc_errors_1.EthereumRpcError(eth_rpc_errors_1.errorCodes.rpc.internal, `JsonRpcEngine: "next" return handlers must be functions. ` +
`Received "${typeof returnHandler}" for request:\n${jsonify(req)}`, { request: req }));
}
returnHandlers.push(returnHandler);
}
// False indicates that the request should not end
resolve([null, false]);
}
};
try {
middleware(req, res, next, end);
}
catch (error) {
end(error);
}
});
}
/**
* Serially executes array of return handlers. The request and response are
* assumed to be in their scope.
*/
static async _runReturnHandlers(handlers) {
for (const handler of handlers) {
await new Promise((resolve, reject) => {
handler((err) => (err ? reject(err) : resolve()));
});
}
}
/**
* Throws an error if the response has neither a result nor an error, or if
* the "isComplete" flag is falsy.
*/
static _checkForCompletion(req, res, isComplete) {
if (!('result' in res) && !('error' in res)) {
throw new eth_rpc_errors_1.EthereumRpcError(eth_rpc_errors_1.errorCodes.rpc.internal, `JsonRpcEngine: Response has no error or result for request:\n${jsonify(req)}`, { request: req });
}
if (!isComplete) {
throw new eth_rpc_errors_1.EthereumRpcError(eth_rpc_errors_1.errorCodes.rpc.internal, `JsonRpcEngine: Nothing ended request:\n${jsonify(req)}`, { request: req });
}
}
}
exports.JsonRpcEngine = JsonRpcEngine;
function jsonify(request) {
return JSON.stringify(request, null, 2);
}
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