Google cloud functions - cannot read property 'getApplicationDefault' - google-cloud-functions

Question

I have deployed a cloud function to invoke a dataflow pipeline template and trying to trigger the function by placing the file in cloud storage bucket.
As node.js prerequisite I have done,
npm init
npm install --save googleapis
Index.js
const google = require('googleapis');
exports.goWithTheDataFlow = function(event, callback) {
const file = event.data;
google.auth.getApplicationDefault(function (err, authClient, projectId) {
if (err) {
throw err;
}
console.log(projectId);
if (authClient.createScopedRequired && authClient.createScopedRequired()) {
authClient = authClient.createScoped([
'https://www.googleapis.com/auth/cloud-platform',
'https://www.googleapis.com/auth/userinfo.email'
]);
}
const dataflow = google.dataflow({ version: 'v1b3', auth: authClient });
console.log(`gs://${file.bucket}/${file.name}`);
dataflow.projects.templates.create({
projectId: projectId,
resource: {
parameters: {
inputFile: `gs://${file.bucket}/${file.name}`
},
jobName: 'cloud-fn-dataflow-test',
gcsPath: 'gs://jaison/templates/ApacheBeamTemplate'
}
}, function(err, response) {
if (err) {
console.error("problem running dataflow template, error was: ", err);
}
console.log("Dataflow template response: ", response);
callback();
});
});
callback();
};
Command used to deploy cloud function:
gcloud beta functions deploy goWithTheDataFlow --stage-bucket cf100stage --trigger-bucket cf100
Dataflow(Apache beam):
I was able to execute the dataflow template from console and below is the path of the template,
'gs://jaison/templates/ApacheBeamTemplate'
Function crashes with below error:
TypeError: Cannot read property 'getApplicationDefault' of undefined
at exports.goWithTheDataFlow (/user_code/index.js:11:17) at
/var/tmp/worker/worker.js:695:16 at /var/tmp/worker/worker.js:660:9 at
_combinedTickCallback (internal/process/next_tick.js:73:7) at process._tickDomainCallback (internal/process/next_tick.js:128:9)
Looks like I am missing libraries. Not sure how to fix this. Please help.

Answer 1

My cloud function works with below changes,
1.Setting up GOOGLE_APPLICATION_CREDENTIALS to service account json file
export GOOGLE_APPLICATION_CREDENTIALS="/path/of/svc/json/file.json"
2.index.js
var {google} = require('googleapis');
exports.TriggerBeam = (event, callback) => {
const file = event.data;
const context = event.context;
console.log(`Event ${context.eventId}`);
console.log(` Event Type: ${context.eventType}`);
console.log(` Bucket: ${file.bucket}`);
console.log(` File: ${file.name}`);
console.log(` Metageneration: ${file.metageneration}`);
console.log(` Created: ${file.timeCreated}`);
console.log(` Updated: ${file.updated}`);
google.auth.getApplicationDefault(function (err, authClient, projectId) {
if (err) {
throw err;
}
console.log(projectId);
const dataflow = google.dataflow({ version: 'v1b3', auth: authClient });
console.log(`gs://${file.bucket}/${file.name}`);
dataflow.projects.templates.create({
projectId: projectId,
resource: {
parameters: {
inputFile: `gs://${file.bucket}/${file.name}`
},
jobName: 'cloud-fn-beam-test',
gcsPath: 'gs://jaison/templates/ApacheBeamTemplate'
}
}, function(err, response) {
if (err) {
console.error("problem running dataflow template, error was: ", err);
}
console.log("Dataflow template response: ", response);
callback();
});
});
callback();
};