Can't access Datastore through Google Cloud function using node.js

Question

Whenever I run the function it will just run until it crashes stating the error is unknown. I feel it may be something to do with the version of the datastore dependency in my package.json file

package.json

{
  "name": "sample-http",
  "version": "0.0.1",
  "dependencies": {
    "@google-cloud/datastore": "5.1.0"
  }
}

index.js

/**
 * Responds to any HTTP request.
 *
 * @param {!express:Request} req HTTP request context.
 * @param {!express:Response} res HTTP response context.
 */

// Requested from front end
var date = "2002-09-13";
var limit = "10";

exports.checkRecords = async (req, res) => {
  // Search for date in Datastore
    const {Datastore} = require('@google-cloud/datastore');
    const datastore = new Datastore({
        projectId: '...',
        keyFilename: '...'
    });

    const taskKey = datastore.key('headline');
    const [entity] = await datastore.get(taskKey);

    if(entity != null){
      res.status(200).send("contains");
    }
    else{
      res.status(200).send("null");
    }
};

I've resorted to simply seeing if the entity is null because nothing else seems to be working

DazWilkin · Accepted Answer · 2020-03-31 16:53:23Z

2

I think you're missing the Kind in the get

I created a Dog Kind and added Freddie to it and can:

var date = "2002-09-13";
var limit = "10";

exports.checkRecords = async (req, res) => {
    const { Datastore } = require("@google-cloud/datastore");
    const datastore = new Datastore();
    const taskKey = datastore.key(["Dog", "Freddie"]);
    const [entity] = await datastore.get(taskKey);

    if (entity != null) {
        res.status(200).send("contains");
    }
    else {
        res.status(200).send("null");
    }
};

NB If your Datastore is in the same project, you can use Application Default Credentials to simplify the auth, i.e. const datastore = new Datastore();

answered Mar 31, 2020 at 16:53

DazWilkin

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3 Comments

Geeda Over a year ago

Thank you! Such a simple fix. Using the default Datastore constructor. I was treating the function like an external one and therefore thought it had to authenticate through the Datastore constructor but that's not required given everything is already in the same project

DazWilkin Over a year ago

Another optimization is to pull the require and the constructor out into the global scope. Cloud Functions doesn't create a new instance of your code every invocation and this will reuse.

DazWilkin Over a year ago

See: medium.com/@DazWilkin/cloud-functions-global-scope-7450a5f08038

marian.vladoi · Accepted Answer · 2020-03-31 17:01:48Z

1

Can you try:

var date = "2002-09-13";
var limit = "10";

exports.checkRecords = async (req, res) => {
  // Search for date in Datastore
    const {Datastore} = require('@google-cloud/datastore');
    const datastore = new Datastore({
        projectId: '...',
        keyFilename: '...'
    });

    // The kind of the entity
    const kind = 'Task';

    // The name/ID of the entity
    const name = 'sampletask1';

    // The Cloud Datastore key for the new entity
    const taskKey = datastore.key([kind, name]);
    const [entity] = await datastore.get(taskKey);

    if(entity != null){
      res.status(200).send("contains");
    }
    else{
      res.status(200).send("null");
    }
};

answered Mar 31, 2020 at 17:01

marian.vladoi

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