Using Cloud Functions

Using Cloud Functions

Cloud Functions is a serverless compute service that allows you to run code without provisioning or managing servers. You can create a Cloud Function that is triggered when a new file is uploaded to GCP storage. The Cloud Function can then check the file's timestamp to see if it is delayed. If the file is delayed, the Cloud Function can send an alert notification to you or your team.

Here are the steps to create a Cloud Function to alert on ETL inbound file delay:

1. Go to the Cloud Functions console.
2. Click the Create Function button.
3. Give your function a name and select a trigger. In this case, the trigger should be Storage - Object created.
4. Select the GCP storage bucket where your ETL inbound files are stored.
5. Click the Next button.
6. Write a function that checks the file's timestamp and sends an alert notification if the file is delayed.
7. Click the Deploy button.

Once your Cloud Function is deployed, it will be triggered whenever a new file is uploaded to the specified GCP storage bucket. The Cloud Function will then check the file's timestamp to see if it is delayed. If the file is delayed, the Cloud Function will send an alert notification to you or your team.

Cloud Functions can detect the event that a file does not arrive at all. You can use a Cloud Function to schedule a job to check for the presence of a file in a GCP storage bucket at a specific time. If the file is not present, the Cloud Function can send an alert notification.

Here are the steps to create a Cloud Function to detect the event that a file does not arrive at all:

1. Go to the Cloud Functions console.
2. Click the Create Function button.
3. Give your function a name and select a trigger. In this case, the trigger should be Schedule - On a schedule.
4. Select the frequency at which you want the Cloud Function to run. For example, you could select every hour or every day.
5. Click the Next button.
6. Write a function that checks for the presence of the file in the GCP storage bucket.
7. If the file is not present, send an alert notification.
8. Click the Deploy button.

Once your Cloud Function is deployed, it will run on the schedule that you specified. If the file is not present in the GCP storage bucket, the Cloud Function will send an alert notification.

Here is an example of a Cloud Function that checks for the presence of a file in a GCP storage bucket and sends an alert notification if the file is not present:

Python

import datetime
from google.cloud import storage

def check_for_file(bucket_name, file_name):
  """Checks for the presence of a file in a GCP storage bucket.

  Args:
    bucket_name: The name of the GCP storage bucket.
    file_name: The name of the file to check for.

  Returns:
    True if the file is present, False otherwise.
  """

  storage_client = storage.Client()
  bucket = storage_client.bucket(bucket_name)
  blob = bucket.blob(file_name)

  return blob.exists()

def send_alert(message):
  """Sends an alert notification.

  Args:
    message: The message of the alert notification.
  """

  # TODO: Implement this function to send an alert notification to your preferred notification service.

  pass

def main(event, context):
  """The main function of the Cloud Function.

  Args:
    event: The event that triggered the Cloud Function.
    context: The context of the Cloud Function.
  """

  bucket_name = "my-bucket"
  file_name = "my-file.csv"

  if not check_for_file(bucket_name, file_name):
    send_alert("File {} is missing from bucket {}.".format(file_name, bucket_name))

if __name__ == "__main__":
  main(None, None)

Use code with caution. Learn more

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This is just a simple example, and you may need to modify it to meet your specific needs. For example, you may need to change the frequency of the schedule or the way that the alert notification is sent.