| 1 | import { |
| 2 | ProcedureName, |
| 3 | type ProtocolResponse, |
| 4 | type RequestPayload, |
| 5 | type ResponsePayload, |
| 6 | ResponseStatus, |
| 7 | } from '@/types' |
| 8 | import config from '@/assets/config' |
| 9 | |
| 10 | type ResponseHandler = { |
| 11 | procedureName: ProcedureName |
| 12 | resolve: (value: ResponsePayload | PromiseLike<ResponsePayload>) => void |
| 13 | reject: (reason?: unknown) => void |
| 14 | } |
| 15 | |
| 16 | export class UIClient { |
| 17 | private static instance: UIClient | null = null |
| 18 | |
| 19 | private ws!: WebSocket |
| 20 | private responseHandlers: Map<string, ResponseHandler> |
| 21 | |
| 22 | private constructor() { |
| 23 | this.openWS() |
| 24 | this.responseHandlers = new Map<string, ResponseHandler>() |
| 25 | } |
| 26 | |
| 27 | public static getInstance() { |
| 28 | if (UIClient.instance === null) { |
| 29 | UIClient.instance = new UIClient() |
| 30 | } |
| 31 | return UIClient.instance |
| 32 | } |
| 33 | |
| 34 | public registerWSonOpenListener(listener: (event: Event) => void) { |
| 35 | this.ws.addEventListener('open', listener) |
| 36 | } |
| 37 | |
| 38 | public async startSimulator(): Promise<ResponsePayload> { |
| 39 | return this.sendRequest(ProcedureName.START_SIMULATOR, {}) |
| 40 | } |
| 41 | |
| 42 | public async stopSimulator(): Promise<ResponsePayload> { |
| 43 | return this.sendRequest(ProcedureName.STOP_SIMULATOR, {}) |
| 44 | } |
| 45 | |
| 46 | public async listChargingStations(): Promise<ResponsePayload> { |
| 47 | return this.sendRequest(ProcedureName.LIST_CHARGING_STATIONS, {}) |
| 48 | } |
| 49 | |
| 50 | public async startChargingStation(hashId: string): Promise<ResponsePayload> { |
| 51 | return this.sendRequest(ProcedureName.START_CHARGING_STATION, { hashIds: [hashId] }) |
| 52 | } |
| 53 | |
| 54 | public async stopChargingStation(hashId: string): Promise<ResponsePayload> { |
| 55 | return this.sendRequest(ProcedureName.STOP_CHARGING_STATION, { hashIds: [hashId] }) |
| 56 | } |
| 57 | |
| 58 | public async openConnection(hashId: string): Promise<ResponsePayload> { |
| 59 | return this.sendRequest(ProcedureName.OPEN_CONNECTION, { |
| 60 | hashIds: [hashId], |
| 61 | }) |
| 62 | } |
| 63 | |
| 64 | public async closeConnection(hashId: string): Promise<ResponsePayload> { |
| 65 | return this.sendRequest(ProcedureName.CLOSE_CONNECTION, { |
| 66 | hashIds: [hashId], |
| 67 | }) |
| 68 | } |
| 69 | |
| 70 | public async startTransaction( |
| 71 | hashId: string, |
| 72 | connectorId: number, |
| 73 | idTag: string | undefined |
| 74 | ): Promise<ResponsePayload> { |
| 75 | return this.sendRequest(ProcedureName.START_TRANSACTION, { |
| 76 | hashIds: [hashId], |
| 77 | connectorId, |
| 78 | idTag, |
| 79 | }) |
| 80 | } |
| 81 | |
| 82 | public async stopTransaction( |
| 83 | hashId: string, |
| 84 | transactionId: number | undefined |
| 85 | ): Promise<ResponsePayload> { |
| 86 | return this.sendRequest(ProcedureName.STOP_TRANSACTION, { |
| 87 | hashIds: [hashId], |
| 88 | transactionId, |
| 89 | }) |
| 90 | } |
| 91 | |
| 92 | public async startAutomaticTransactionGenerator( |
| 93 | hashId: string, |
| 94 | connectorId: number |
| 95 | ): Promise<ResponsePayload> { |
| 96 | return this.sendRequest(ProcedureName.START_AUTOMATIC_TRANSACTION_GENERATOR, { |
| 97 | hashIds: [hashId], |
| 98 | connectorIds: [connectorId], |
| 99 | }) |
| 100 | } |
| 101 | |
| 102 | public async stopAutomaticTransactionGenerator( |
| 103 | hashId: string, |
| 104 | connectorId: number |
| 105 | ): Promise<ResponsePayload> { |
| 106 | return this.sendRequest(ProcedureName.STOP_AUTOMATIC_TRANSACTION_GENERATOR, { |
| 107 | hashIds: [hashId], |
| 108 | connectorIds: [connectorId], |
| 109 | }) |
| 110 | } |
| 111 | |
| 112 | private openWS(): void { |
| 113 | this.ws = new WebSocket( |
| 114 | `ws://${config.uiServer.host}:${config.uiServer.port}`, |
| 115 | config.uiServer.protocol |
| 116 | ) |
| 117 | this.ws.onmessage = this.responseHandler.bind(this) |
| 118 | this.ws.onerror = (errorEvent) => { |
| 119 | console.error('WebSocket error: ', errorEvent) |
| 120 | } |
| 121 | this.ws.onclose = (closeEvent) => { |
| 122 | console.info('WebSocket closed: ', closeEvent) |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | private setResponseHandler( |
| 127 | id: string, |
| 128 | procedureName: ProcedureName, |
| 129 | resolve: (value: ResponsePayload | PromiseLike<ResponsePayload>) => void, |
| 130 | reject: (reason?: unknown) => void |
| 131 | ): void { |
| 132 | this.responseHandlers.set(id, { procedureName, resolve, reject }) |
| 133 | } |
| 134 | |
| 135 | private getResponseHandler(id: string): ResponseHandler | undefined { |
| 136 | return this.responseHandlers.get(id) |
| 137 | } |
| 138 | |
| 139 | private deleteResponseHandler(id: string): boolean { |
| 140 | return this.responseHandlers.delete(id) |
| 141 | } |
| 142 | |
| 143 | private async sendRequest( |
| 144 | command: ProcedureName, |
| 145 | data: RequestPayload |
| 146 | ): Promise<ResponsePayload> { |
| 147 | return new Promise<ResponsePayload>((resolve, reject) => { |
| 148 | if (this.ws.readyState !== WebSocket.OPEN) { |
| 149 | this.openWS() |
| 150 | } |
| 151 | if (this.ws.readyState === WebSocket.OPEN) { |
| 152 | const uuid = crypto.randomUUID() |
| 153 | const msg = JSON.stringify([uuid, command, data]) |
| 154 | const sendTimeout = setTimeout(() => { |
| 155 | this.deleteResponseHandler(uuid) |
| 156 | return reject(new Error(`Send request '${command}' message timeout`)) |
| 157 | }, 60 * 1000) |
| 158 | try { |
| 159 | this.ws.send(msg) |
| 160 | this.setResponseHandler(uuid, command, resolve, reject) |
| 161 | } catch (error) { |
| 162 | this.deleteResponseHandler(uuid) |
| 163 | reject(error) |
| 164 | } finally { |
| 165 | clearTimeout(sendTimeout) |
| 166 | } |
| 167 | } else { |
| 168 | throw new Error(`Send request '${command}' message: connection not opened`) |
| 169 | } |
| 170 | }) |
| 171 | } |
| 172 | |
| 173 | private responseHandler(messageEvent: MessageEvent<string>): void { |
| 174 | const response = JSON.parse(messageEvent.data) as ProtocolResponse |
| 175 | |
| 176 | if (Array.isArray(response) === false) { |
| 177 | throw new Error(`Response not an array: ${JSON.stringify(response, undefined, 2)}`) |
| 178 | } |
| 179 | |
| 180 | const [uuid, responsePayload] = response |
| 181 | |
| 182 | if (this.responseHandlers.has(uuid) === true) { |
| 183 | const { procedureName, resolve, reject } = this.getResponseHandler(uuid)! |
| 184 | switch (responsePayload.status) { |
| 185 | case ResponseStatus.SUCCESS: |
| 186 | resolve(responsePayload) |
| 187 | break |
| 188 | case ResponseStatus.FAILURE: |
| 189 | reject(responsePayload) |
| 190 | break |
| 191 | default: |
| 192 | console.error( |
| 193 | `Response status for procedure '${procedureName}' not supported: '${responsePayload.status}'` |
| 194 | ) |
| 195 | } |
| 196 | this.deleteResponseHandler(uuid) |
| 197 | } else { |
| 198 | throw new Error(`Not a response to a request: ${JSON.stringify(response, undefined, 2)}`) |
| 199 | } |
| 200 | } |
| 201 | } |