| 1 | import type { JsonType } from '@/types/JsonType'; |
| 2 | import { ProcedureName, ResponseStatus } from '@/types/UIProtocol'; |
| 3 | import type { ProtocolResponse, ResponsePayload } from '@/types/UIProtocol'; |
| 4 | |
| 5 | import Utils from './Utils'; |
| 6 | import config from '@/assets/config'; |
| 7 | import { v4 as uuidv4 } from 'uuid'; |
| 8 | |
| 9 | type ResponseHandler = { |
| 10 | procedureName: ProcedureName; |
| 11 | resolve: (value: ResponsePayload | PromiseLike<ResponsePayload>) => void; |
| 12 | reject: (reason?: any) => void; |
| 13 | }; |
| 14 | |
| 15 | export default class UIClient { |
| 16 | private static _instance: UIClient | null = null; |
| 17 | |
| 18 | private _ws!: WebSocket; |
| 19 | private _responseHandlers: Map<string, ResponseHandler>; |
| 20 | |
| 21 | private constructor() { |
| 22 | this.openWS(); |
| 23 | this._responseHandlers = new Map<string, ResponseHandler>(); |
| 24 | } |
| 25 | |
| 26 | public static getInstance() { |
| 27 | if (UIClient._instance === null) { |
| 28 | UIClient._instance = new UIClient(); |
| 29 | } |
| 30 | return UIClient._instance; |
| 31 | } |
| 32 | |
| 33 | public registerWSonOpenListener(listener: (this: WebSocket, ev: Event) => void) { |
| 34 | this._ws.addEventListener('open', listener); |
| 35 | } |
| 36 | |
| 37 | public async startSimulator(): Promise<ResponsePayload> { |
| 38 | return this.sendRequest(ProcedureName.START_SIMULATOR, {}); |
| 39 | } |
| 40 | |
| 41 | public async stopSimulator(): Promise<ResponsePayload> { |
| 42 | return this.sendRequest(ProcedureName.STOP_SIMULATOR, {}); |
| 43 | } |
| 44 | |
| 45 | public async listChargingStations(): Promise<ResponsePayload> { |
| 46 | return this.sendRequest(ProcedureName.LIST_CHARGING_STATIONS, {}); |
| 47 | } |
| 48 | |
| 49 | public async startChargingStation(hashId: string): Promise<ResponsePayload> { |
| 50 | return this.sendRequest(ProcedureName.START_CHARGING_STATION, { hashId }); |
| 51 | } |
| 52 | |
| 53 | public async stopChargingStation(hashId: string): Promise<ResponsePayload> { |
| 54 | return this.sendRequest(ProcedureName.STOP_CHARGING_STATION, { hashId }); |
| 55 | } |
| 56 | |
| 57 | public async openConnection(hashId: string): Promise<ResponsePayload> { |
| 58 | return this.sendRequest(ProcedureName.OPEN_CONNECTION, { |
| 59 | hashId, |
| 60 | }); |
| 61 | } |
| 62 | |
| 63 | public async closeConnection(hashId: string): Promise<ResponsePayload> { |
| 64 | return this.sendRequest(ProcedureName.CLOSE_CONNECTION, { |
| 65 | hashId, |
| 66 | }); |
| 67 | } |
| 68 | |
| 69 | public async startTransaction( |
| 70 | hashId: string, |
| 71 | connectorId: number, |
| 72 | idTag: string | undefined |
| 73 | ): Promise<ResponsePayload> { |
| 74 | return this.sendRequest(ProcedureName.START_TRANSACTION, { |
| 75 | hashId, |
| 76 | connectorId, |
| 77 | idTag, |
| 78 | }); |
| 79 | } |
| 80 | |
| 81 | public async stopTransaction( |
| 82 | hashId: string, |
| 83 | transactionId: number | undefined |
| 84 | ): Promise<ResponsePayload> { |
| 85 | return this.sendRequest(ProcedureName.STOP_TRANSACTION, { |
| 86 | hashId, |
| 87 | transactionId, |
| 88 | }); |
| 89 | } |
| 90 | |
| 91 | private openWS(): void { |
| 92 | this._ws = new WebSocket( |
| 93 | `ws://${config.emobility.host}:${config.emobility.port}`, |
| 94 | config.emobility.protocol |
| 95 | ); |
| 96 | this._ws.onmessage = this.responseHandler.bind(this); |
| 97 | this._ws.onerror = (error) => { |
| 98 | console.error('WebSocket error: ', error); |
| 99 | }; |
| 100 | } |
| 101 | |
| 102 | private setResponseHandler( |
| 103 | id: string, |
| 104 | procedureName: ProcedureName, |
| 105 | resolve: (value: ResponsePayload | PromiseLike<ResponsePayload>) => void, |
| 106 | reject: (reason?: any) => void |
| 107 | ): void { |
| 108 | this._responseHandlers.set(id, { resolve, reject, procedureName }); |
| 109 | } |
| 110 | |
| 111 | private getResponseHandler(id: string): ResponseHandler | undefined { |
| 112 | return this._responseHandlers.get(id); |
| 113 | } |
| 114 | |
| 115 | private deleteResponseHandler(id: string): boolean { |
| 116 | return this._responseHandlers.delete(id); |
| 117 | } |
| 118 | |
| 119 | private async sendRequest(command: ProcedureName, data: JsonType): Promise<ResponsePayload> { |
| 120 | let uuid: string; |
| 121 | return Utils.promiseWithTimeout( |
| 122 | new Promise((resolve, reject) => { |
| 123 | uuid = uuidv4(); |
| 124 | const msg = JSON.stringify([uuid, command, data]); |
| 125 | |
| 126 | if (this._ws.readyState !== WebSocket.OPEN) { |
| 127 | this.openWS(); |
| 128 | } |
| 129 | if (this._ws.readyState === WebSocket.OPEN) { |
| 130 | this._ws.send(msg); |
| 131 | } else { |
| 132 | throw new Error(`Send request ${command} message: connection not opened`); |
| 133 | } |
| 134 | |
| 135 | this.setResponseHandler(uuid, command, resolve, reject); |
| 136 | }), |
| 137 | 60 * 1000, |
| 138 | Error(`Send request ${command} message timeout`), |
| 139 | () => { |
| 140 | this._responseHandlers.delete(uuid); |
| 141 | } |
| 142 | ); |
| 143 | } |
| 144 | |
| 145 | private responseHandler(messageEvent: MessageEvent<string>): void { |
| 146 | const data = JSON.parse(messageEvent.data) as ProtocolResponse; |
| 147 | |
| 148 | if (Array.isArray(data) === false) { |
| 149 | throw new Error('Response not an array: ' + JSON.stringify(data, null, 2)); |
| 150 | } |
| 151 | |
| 152 | const [uuid, response] = data; |
| 153 | |
| 154 | if (this._responseHandlers.has(uuid) === true) { |
| 155 | switch (response.status) { |
| 156 | case ResponseStatus.SUCCESS: |
| 157 | this.getResponseHandler(uuid)?.resolve(response); |
| 158 | break; |
| 159 | case ResponseStatus.FAILURE: |
| 160 | this.getResponseHandler(uuid)?.reject(response); |
| 161 | break; |
| 162 | default: |
| 163 | console.error(`Response status not supported: ${response.status}`); |
| 164 | } |
| 165 | this.deleteResponseHandler(uuid); |
| 166 | } else { |
| 167 | throw new Error('Not a response to a request: ' + JSON.stringify(data, null, 2)); |
| 168 | } |
| 169 | } |
| 170 | } |