App engine

app-engine.md

Querying google datasstore

const datastore = require('@google-cloud/datastore')({
      projectId: 'captureappprod',
      keyFilename: '/path/to/key.json' // key optained from App engine / IAM admin / service accounts
});
function deviceCount(start, count=0) {
    const batchSize = 300;
    const query = datastore.createQuery('Device') // Device is the 'kind'
        .limit(batchSize)
        .filter('app', '=', 'groove'); // key = value you are searching for
    if (start) {
        query.start(start);
    }

    datastore.runQuery(query)
        .then(queryResult => {
            console.log(`Getting ${batchSize} devices cursor: ` + start);
            const devices = queryResult[0];
            count += devices.length;
            const info = queryResult[1];
            if (info.moreResults != datastore.NO_MORE_RESULTS) {
                deviceCount(info.endCursor, count + devices.length); // recursivly get more from the last cursor pointer
            }
            console.log(info.endCursor, count);
        });
}
deviceCount();