| 1 | import { JsonType } from '@/type/JsonType'; |
| 2 | import { |
| 3 | ProcedureName, |
| 4 | ProtocolResponse, |
| 5 | ResponsePayload, |
| 6 | ResponseStatus, |
| 7 | } from '@/type/UIProtocol'; |
| 8 | import Utils from './Utils'; |
| 9 | import config from '@/assets/config'; |
| 10 | import { v4 as uuidv4 } from 'uuid'; |
| 11 | |
| 12 | type ResponseHandler = { |
| 13 | resolve: (value: ResponsePayload | PromiseLike<ResponsePayload>) => void; |
| 14 | reject: (reason?: any) => void; |
| 15 | procedureName: ProcedureName; |
| 16 | }; |
| 17 | |
| 18 | export default class UIClient { |
| 19 | private static _instance: UIClient | null = null; |
| 20 | |
| 21 | private _ws: WebSocket; |
| 22 | private _responseHandlers: Map<string, ResponseHandler>; |
| 23 | |
| 24 | private constructor() { |
| 25 | this._ws = new WebSocket( |
| 26 | `ws://${config.emobility.host}:${config.emobility.port}`, |
| 27 | config.emobility.protocol |
| 28 | ); |
| 29 | |
| 30 | this._responseHandlers = new Map<string, ResponseHandler>(); |
| 31 | |
| 32 | this._ws.onmessage = this.responseHandler.bind(this); |
| 33 | } |
| 34 | |
| 35 | public static get instance() { |
| 36 | if (UIClient._instance === null) { |
| 37 | UIClient._instance = new UIClient(); |
| 38 | } |
| 39 | return UIClient._instance; |
| 40 | } |
| 41 | |
| 42 | public onOpen(listener: (this: WebSocket, ev: Event) => void) { |
| 43 | this._ws.addEventListener('open', listener); |
| 44 | } |
| 45 | |
| 46 | public async listChargingStations(): Promise<ResponsePayload> { |
| 47 | console.debug('listChargingStations'); |
| 48 | |
| 49 | return this.sendRequest(ProcedureName.LIST_CHARGING_STATIONS, {}); |
| 50 | } |
| 51 | |
| 52 | public async startTransaction( |
| 53 | hashId: string, |
| 54 | connectorId: number, |
| 55 | idTag: string |
| 56 | ): Promise<ResponsePayload> { |
| 57 | console.debug('startTransaction'); |
| 58 | |
| 59 | return this.sendRequest(ProcedureName.START_TRANSACTION, { |
| 60 | hashId, |
| 61 | connectorId, |
| 62 | idTag, |
| 63 | }); |
| 64 | } |
| 65 | |
| 66 | public async stopTransaction(hashId: string, transactionId: number): Promise<ResponsePayload> { |
| 67 | console.debug('stopTransaction'); |
| 68 | |
| 69 | return this.sendRequest(ProcedureName.STOP_TRANSACTION, { |
| 70 | hashId, |
| 71 | transactionId, |
| 72 | }); |
| 73 | } |
| 74 | |
| 75 | private setResponseHandler( |
| 76 | id: string, |
| 77 | resolve: (value: ResponsePayload | PromiseLike<ResponsePayload>) => void, |
| 78 | reject: (reason?: any) => void, |
| 79 | procedureName: ProcedureName |
| 80 | ): void { |
| 81 | this._responseHandlers.set(id, { resolve, reject, procedureName }); |
| 82 | } |
| 83 | |
| 84 | private getResponseHandler(id: string): ResponseHandler | undefined { |
| 85 | return this._responseHandlers.get(id); |
| 86 | } |
| 87 | |
| 88 | private async sendRequest(command: ProcedureName, data: JsonType): Promise<ResponsePayload> { |
| 89 | let uuid: string; |
| 90 | return Utils.promiseWithTimeout( |
| 91 | new Promise((resolve, reject) => { |
| 92 | uuid = uuidv4(); |
| 93 | const msg = JSON.stringify([uuid, command, data]); |
| 94 | |
| 95 | if (this._ws.readyState === this._ws.OPEN) { |
| 96 | console.debug(`Send request ${command} message: `, msg); |
| 97 | this._ws.send(msg); |
| 98 | } else { |
| 99 | throw new Error(`Send request ${command} message: connection not opened`); |
| 100 | } |
| 101 | |
| 102 | this.setResponseHandler(uuid, resolve, reject, command); |
| 103 | }), |
| 104 | 60 * 1000, |
| 105 | Error(`Send request ${command} message timeout`), |
| 106 | () => { |
| 107 | this._responseHandlers.delete(uuid); |
| 108 | } |
| 109 | ); |
| 110 | } |
| 111 | |
| 112 | private responseHandler(messageEvent: MessageEvent<string>): void { |
| 113 | const data = JSON.parse(messageEvent.data) as ProtocolResponse; |
| 114 | |
| 115 | if (Array.isArray(data) === false) { |
| 116 | throw new Error('Response not an array: ' + JSON.stringify(data, null, 2)); |
| 117 | } |
| 118 | |
| 119 | const [uuid, response] = data; |
| 120 | |
| 121 | if (this._responseHandlers.has(uuid) === true) { |
| 122 | switch (response.status) { |
| 123 | case ResponseStatus.SUCCESS: |
| 124 | this.getResponseHandler(uuid)?.resolve(response); |
| 125 | break; |
| 126 | case ResponseStatus.FAILURE: |
| 127 | this.getResponseHandler(uuid)?.reject(response); |
| 128 | break; |
| 129 | default: |
| 130 | throw new Error(`Response status not supported: ${response.status}`); |
| 131 | } |
| 132 | } else { |
| 133 | throw new Error('Not a response to a request: ' + JSON.stringify(data, null, 2)); |
| 134 | } |
| 135 | } |
| 136 | } |