Google IOT Core get device Nodejs client getClient initialization return value problem

[radianceltd]

Hello, I have configured the service credential JSON, and import it under the project main file. The data read by this API is always empty. I do n’t know where I wrote the problem. What I want to achieve is through the new Google v1-client.projects.locations.registries.devices.list to get the API, but one encountered this problem, the following is my code：

const getClient = (res) => {
    // the getClient method looks for the GCLOUD_PROJECT and GOOGLE_APPLICATION_CREDENTIALS
    // environment variables if serviceAccountJson is not passed in
    const authClient =  google.auth.getClient({
        keyFilename: 'riltmw025tool-2019-296a54b9be.json',
        scopes: ['https://www.googleapis.com/auth/cloud-platform'],
    });

    const discoveryUrl = `${DISCOVERY_API}?version=${API_VERSION}`;

    google.options({
        auth: authClient,
    });

    try {
        res.send(google.discoverAPI(discoveryUrl));
        return google.discoverAPI(discoveryUrl);
    } catch (err) {
        console.error('Error during API discovery.', err);
    }
};

//List all devices in the specified registry
const registry_list_Device = async (
    client,
    registryId,
    projectId,
    cloudRegion,
    res
) => {
    const parentName = `projects/${projectId}/locations/${cloudRegion}`;
    const registryName = `${parentName}/registries/${registryId}`;

    const request = {
        parent: registryName,
    };
    res.send(client);
    try {

        const {data} = await client.projects.locations.registries.devices.list(
            request
        );

        res.status(200).send(data);
        console.log('Current devices in registry:', data['devices']);
    } catch (err) {
        res.status(402).send(err);
        console.error('Could not list devices', err);
    }
}

[radianceltd]

When I read the client API, Getclient returned to me like this, I don't know how to call const {data} = await client.projects.locations.registries.devices.list (request); the data data

[fhinkel]

@hongalex Could you have a look at this IoT issue? Thanks

[radianceltd]

@hongalex Can you help me see my problem

[hongalex]

I think the main issue here is that google.discoverAPI(discoveryUrl) is an async call that returns a Promise rather than a value. Therefore, your res.send call doesn't actually send the actual client. Try using await google.discoverAPI(discoveryUrl) in your getClient function. This means that getClient will have to marked async as well.

Since this isn't an issue with the samples themselves, I'm marking this issue as closed. If you continue to experience issues, I recommend bringing your question to one of the forums described here: https://cloud.google.com/support/docs/community

Many members of the GCP community---including Google employees and other experts---help out on those forums.

[radianceltd]

@hongalex Thank you for your answer. Like you described, google.discoverAPI (discoveryUrl) returns an object. Promise, I did n’t understand what this data is, but I passed const client = getClient ('riltmw025tool-2019-21396a54b9be.json'); passed it to the Google API I need to call, such as: listDevicesForGateway, then this client value Passed to listDevicesForGateway as the client, always accessing client.projects.locations.registries.devices.list returns no data

[radianceltd]

exports.ymqtthelloa = async (req,res) => {

    const cloudRegion = 'us-central1';
    const gatewayId = 'my-region';
    const projectId = 'riltmw025tool';
    const registryId = 'my-registry-006s';

    const client = getClient('riltmw025tool-2019-21396a54b9be.json');
    listDevicesForGateway(client, projectId, cloudRegion, registryId, gatewayId);
    console.log("异步读取lo: " + client);
}

const getClient = async (serviceAccountJson,res) => {
    // the getClient method looks for the GCLOUD_PROJECT and GOOGLE_APPLICATION_CREDENTIALS
    // environment variables if serviceAccountJson is not passed in
    const authClient = await google.auth.getClient({
        keyFilename: serviceAccountJson,
        scopes: ['https://www.googleapis.com/auth/cloud-platform'],
    });
   // console.log("11"+authClient.toString());
    const discoveryUrl = 'https://cloudiot.googleapis.com/v1/projects/riltmw025tool-2019/locations/us-central1/registries/my-registry/devices';
   // console.log("22"+discoveryUrl.toString());
    google.options({
        auth: authClient,
    });

    try {
        console.log("33"+google.discoverAPI(discoveryUrl));
        return google.discoverAPI(discoveryUrl);
    } catch (err) {
        console.log("402"+err);
        console.error('Error during API discovery.', err);
    }
};

const listDevicesForGateway = async (
    client,
    projectId,
    cloudRegion,
    registryId,
    gatewayId
) => {
    const parentName = `projects/${projectId}/locations/${cloudRegion}/registries/${registryId}`;
    const request = {
        parent: parentName,
        'gatewayListOptions.associationsGatewayId': gatewayId,
    };

    let devices;
    try {
        const {data} = await client.projects.locations.registries.devices.list(
            request
        );
        devices = data.devices;
    } catch (err) {
        console.error('Could not list devices', err);
        return;
    }

    console.log('Current devices bound to gateway: ', gatewayId);
    if (devices && devices.length > 0) {
        devices.forEach(device => {
            console.log(`\tDevice: ${device.numId} : ${device.id}`);
        });
    } else {
        console.log('No devices bound to this gateway.');
    }
    // [END iot_list_devices_for_gateway]
};

Why does client.projects.locations.registries.devices.list not return data?