mcps-sdk-js
Version:
MCPS JavaScript SDK
112 lines • 4.04 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());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.WsClient = void 0;
const types = require("../types");
const EventEmitter = require("events");
const Websocket = require("isomorphic-ws");
const errors_1 = require("../errors");
/**
* MCPS Websocket Client
* @since v0.17
*/
class WsClient {
constructor(url) {
this.url = url;
this.eventEmitter = new EventEmitter();
}
/**
* Initialize ws client
* @since v0.17
*/
connect() {
this.ws = new Websocket(this.url + '/websocket');
if (!this.ws) {
throw new errors_1.SdkError('Websocket client not initialized'); // Should not happen
}
this.ws.onopen = () => {
console.log('Websocket connected');
this.eventEmitter.emit('open');
};
this.ws.onclose = () => {
console.log('Websocket disconnected');
this.eventEmitter.emit('close');
};
this.ws.onmessage = (resp) => {
const data = JSON.parse(resp.data.toString());
if (!data.id) {
this.eventEmitter.emit('error', 'Unexpected response: ' + JSON.stringify(data));
}
// Route the data to the specified subscriber based on the request ID
this.eventEmitter.emit(data.id, data.error, data.result);
};
this.ws.onerror = (err) => {
console.log('Websocket error');
this.eventEmitter.emit('error', err);
};
}
/**
* Disconnect from server
* @since v0.17
*/
disconnect() {
return __awaiter(this, void 0, void 0, function* () {
return new Promise(reslove => {
// Unsubscribe all from server
const id = 'unsubscribe_all';
this.send(types.RpcMethods.UnsubscribeAll, id);
this.eventEmitter.on(id, error => {
if (error) {
throw new errors_1.SdkError(error.message);
}
if (!this.ws) {
throw new errors_1.SdkError('Websocket client not initialized'); // Should not happen
}
// Remove all listeners
this.eventEmitter.removeAllListeners();
// Destroy ws instance
this.ws.terminate();
reslove();
});
});
});
}
/**
* Check if the ws client is connected or not
* @since v0.17
*/
isReady() {
var _a;
return ((_a = this.ws) === null || _a === void 0 ? void 0 : _a.readyState) === 1;
}
/**
* Send subscription to tendermint
* @param method The tendermint rpc method
* @param id The request id which is the same as the incoming response
* @param query The tendermint query string
* @since v0.17
*/
send(method, id, query) {
if (!this.ws) {
throw new errors_1.SdkError('Websocket client not initialized'); // Should not happen
}
this.ws.send(JSON.stringify({
jsonrpc: '2.0',
method,
id,
params: {
query,
},
}));
}
}
exports.WsClient = WsClient;
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