Webhooks

Setting up and sending notifications via webhooks (Slack, Discord, Microsoft Teams, Google Chat) — an extension of the raw REST call pattern.

Webhooks are an extension of the raw REST call pattern — instead of you constructing the target URL/body yourself for a general REST/Telegram/Pushover endpoint, the destination service (Slack, Discord, Microsoft Teams, Google Chat) hands you a pre-built URL that you rest post to directly.

Setting up Webhooks

Webhooks are user-defined HTTP callbacks that enable real-time communication between web applications; they are the simplest and fastest way to send messages into third-party applications as it simply uses a REST (post) request as opposed to needing to develop a full application for messaging.

Steps

  1. Go to https://api.slack.com/apps/.
  2. Under Create, create an app from manifest.
  3. Select the preferred channel.
  4. Press continue / next till the end.
  5. Select Incoming Webhooks.
  6. Enable Webhooks.
  7. At the bottom, add Webhook to the workspace.
  8. Select which channel in Slack to send messages to.
  9. When done, you should see a webhook URL. This will be used as part of your REST request in AnyLog.

Generated URL (example format — yours will have your own workspace and webhook IDs):

https://hooks.slack.com/services/[team_id]/[webhook_id]/[token]

Send Notifications via AnyLog

Slack Webhooks

AnyLog allows sending cURL requests via the rest command. Since Webhooks are essentially URLs to send messages into a system, we’ll be using the rest command to send notifications from AnyLog into Slack.

  1. Create webhook URL as a variable 
    webhook_url = "https://hooks.slack.com/services/[team_id]/[webhook_id]/[token]"
  2. get percentage of CPU used and current timestamp 
    cpu_percent = get node info cpu_percent
date_time = python "datetime.datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f')"
  3. Create payload 
    text_msg = !date_time + "  CPU usage: " + !cpu_percent
payload = json {"text": !text_msg}
  4. Publish information to Slack via REST 
    rest post where url = !webhook_url and body = !payload and headers = {"Content-Type": "application/json"}

Once sent, an output would appear in the proper Slack channel

Note: Google Chat, Discord and Microsoft Teams use content for the payload key as opposed to text.