如何解决意图处理程序因错误而失败:未定义缓冲区
我已经使用本地配送SDK构建了Google Smart Home Action,如以下文章所述:
- https://developers.google.com/assistant/smarthome/develop/local
- https://github.com/actions-on-google/create-local-home-app
我使用UDP进行设备发现,我的Google nest Hub可以成功扫描和检测笔记本电脑上运行的虚拟设备,以及下载本地应用程序的JS。
我的本地家庭SDK的配置如下-Local Home SDK Configuration。
nest Hub执行我的应用处理程序的IDENTIFY意图时,我收到以下错误:
[smarthome.DeviceManager] Intent handler Failed with error: Buffer is not defined
[smarthome.DeviceManager] Got a rejected promise Buffer is not defined
这似乎是Node.JS错误,而不是本地SDK应用程序本身特有的错误。下面是我的本地应用程序的代码。
/// <reference types="@google/local-home-sdk" />
import App = smarthome.App;
import Constants = smarthome.Constants;
import DataFlow = smarthome.DataFlow;
import Execute = smarthome.Execute;
import Intents = smarthome.Intents;
import IntentFlow = smarthome.IntentFlow;
const SERVER_PORT = 3388;
interface ILightParams {
on?: boolean,brightness?: number
}
class LocalExecutionApp {
constructor(private readonly app: App) { }
identifyHandler(request: IntentFlow.IdentifyRequest):
Promise<IntentFlow.IdentifyResponse> {
console.log("IDENTIFY intent: " + JSON.stringify(request,null,2));
const scanData = request.inputs[0].payload.device.udpScanData;
console.log("SCANDATA: " + JSON.stringify(scanData));
if (!scanData) {
const err = new IntentFlow.HandlerError(request.requestId,'invalid_request','Invalid scan data');
return Promise.reject(err);
}
const localdeviceid = Buffer.from(scanData.data,'hex');
console.log("ScanData Local Device: " + localdeviceid);
const response: IntentFlow.IdentifyResponse = {
intent: Intents.IDENTIFY,requestId: request.requestId,payload: {
device: {
// id: localdeviceid.toString(),id: 'sample-device',verificationId: localdeviceid.toString(),}
}
};
console.log("IDENTIFY response: " + JSON.stringify(response,2));
return Promise.resolve(response);
}
executeHandler(request: IntentFlow.ExecuteRequest):
Promise<IntentFlow.ExecuteResponse> {
console.log("EXECUTE intent: " + JSON.stringify(request,2));
const command = request.inputs[0].payload.commands[0];
const execution = command.execution[0];
const response = new Execute.Response.Builder()
.setRequestId(request.requestId);
const promises: Promise<void>[] = command.devices.map((device) => {
console.log("Handling EXECUTE intent for device: " + JSON.stringify(device));
// Convert execution params to a string for the local device
const params = execution.params as ILightParams;
const payload = this.getDataForCommand(execution.command,params);
// Create a command to send over the local network
const radioCommand = new DataFlow.HttpRequestData();
radioCommand.requestId = request.requestId;
radioCommand.deviceid = device.id;
radioCommand.data = JSON.stringify(payload);
radioCommand.dataType = 'application/json';
radioCommand.port = SERVER_PORT;
radioCommand.method = Constants.HttpOperation.POST;
radioCommand.isSecure = false;
console.log("Sending HTTP request to the smart home device:",payload);
return this.app.getDeviceManager()
.send(radioCommand)
.then(() => {
const state = {online: true};
response.setSuccessstate(device.id,Object.assign(state,params));
console.log(`Command successfully sent to ${device.id}`);
})
.catch((e: IntentFlow.HandlerError) => {
e.errorCode = e.errorCode || 'invalid_request';
response.setErrorState(device.id,e.errorCode);
console.error('An error occurred sending the command',e.errorCode);
});
});
return Promise.all(promises)
.then(() => {
return response.build();
})
.catch((e) => {
const err = new IntentFlow.HandlerError(request.requestId,e.message);
return Promise.reject(err);
});
}
/**
* Convert execution request into a local device command
*/
getDataForCommand(command: string,params: ILightParams): unkNown {
switch (command) {
case 'action.devices.commands.OnOff':
return {
on: params.on ? true : false
};
default:
console.error('UnkNown command',command);
return {};
}
}
}
const localHomeSdk = new App('1.0.0');
const localApp = new LocalExecutionApp(localHomeSdk);
localHomeSdk
.onIdentify(localApp.identifyHandler.bind(localApp))
.onExecute(localApp.executeHandler.bind(localApp))
.listen()
.then(() => console.log('Ready'))
.catch((e: Error) => console.error(e));
任何对为什么会发生此错误的见解都将受到赞赏。
干杯。
解决方法
在评论中重新发布答案:
Buffer
不是浏览器环境中直接支持的类型。您可以尝试在网络浏览器的开发者控制台中运行类似x = new Buffer()
之类的内容来自己查看。
要支持Buffer
之类的类,可以使用Webpack之类的捆绑工具。在官方示例中,您可以看到example Webpack configuration。也可以使用其他捆绑工具,示例可以在official Local Home scaffolding tool中找到,也可以直接使用npm init
命令来调用。
npm init @google/local-home-app app/ --bundler webpack
npm init @google/local-home-app app/ --bundler rollup
npm init @google/local-home-app app/ --bundler parcel
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