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Google Cloud Function triggered by Pub/Sub message being sent on certain topic.

This function is simple example of cloud function with Pub/Sub trigger type which send message to Slack channel on behalf of the user(Bot). User will be defined by user token from Slack.

We will use test slack channel test-webshop-cf to test how this function works.

Runtime: Node.js

Guidebook to run this function

  1. Clone this repo
git clone git@github.com:lemon57/cloud-function-pubsub-slack-msg.git
  1. Define Slack user SLACK_TOKEN and SLACK_CHANNEL_ID in .env file.
    You can find user SLACK_TOKEN -> Slack user toke.
    And SLACK_CHANNEL_ID you can find in description of the channel in Slack.
  2. Deploy this function to GC. Wait a few min ☕
gcloud functions deploy <CF_NAME> \
     --trigger-resource <PUB_SUB_TOPIC_NAME> \
     --trigger-event google.pubsub.topic.publish \
     --region=<REGION_NAME> \
     --runtime=<CF_RUNTIME>

Replace PUB_SUB_TOPIC_NAME by your topic name. Define your own.
Replace REGION_NAME by region of current project.
Replace CF_RUNTIME by actual runtime, in our case is nodejs16

  1. Check that the function deployed successfully: by command or through GCC UI.
gcloud functions describe <CF_NAME> --region=<REGION_NAME>
  1. Invoke function directly by command:
gcloud functions call <CF_NAME> --data '{"data":"R29vZ2xlIGNsb3VkIGZ1bmN0aW9uIHdvcmtzaG9w"}'

This string R29vZ2xlIGNsb3VkIGZ1bmN0aW9uIHdvcmtzaG9w base64 encoded. To use your specific message and make it base64 encoded you can use this resource base64encode

or by sending message to certain topic by command:

gcloud pubsub topics publish projects/<PROJECT_NAME>/topics/<TOPIC_NAME> --message Hello

Replace PROJECT_NAME by our current boozt project name. Replace TOPIC_NAME by topic name which you find by following command:

gcloud pubsub topics list | grep <KEY_WORD_FROM_TOPIC_NAME>

Replace KEY_WORD_FROM_TOPIC_NAME by topic name which you just recently created when deploy the function.

  1. Check the logs:
gcloud functions logs read --execution-id=<EXECUTION-ID> --region=<REGION_NAME>

Take EXECUTION_ID from the output after executing these commands: gcloud functions call or gcloud pubsub topics publish.

  1. Check slack channel test-webshop-cf

Enjoy 🎆