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Welcome!

prefect-slack is a collection of prebuilt Prefect tasks and blocks that can be used to quickly send Slack messages in your Prefect flows.

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Getting started

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Prerequisites

A Slack account with permissions to create a Slack app and install it in your workspace.

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Installation

The following command will install a version of prefect-slack compatible with your installed version of prefect. If you don’t already have prefect installed, it will install the newest version of prefect as well. 
pip install "prefect[slack]"
Upgrade to the latest versions of prefect and prefect-slack: 
pip install -U "prefect[slack]"

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Slack setup

To use tasks in the package, create a Slack app and install it in your Slack workspace. You can create a Slack app by navigating to the apps page for your Slack account and selecting ‘Create New App’. For tasks that require a Bot user OAuth token, you can get a token for your app by navigating to your app’s OAuth & Permissions page. For tasks that require a Webhook URL, you can generate a new Webhook URL by navigating to you apps Incoming Webhooks page. Slack’s Basic app setup guide provides additional details on setting up a Slack app.

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Write and run a flow

import asyncio
from prefect import flow
from prefect.context import get_run_context
from prefect_slack import SlackCredentials
from prefect_slack.messages import send_chat_message

@flow
def example_send_message_flow():
   context = get_run_context()

   # Run other tasks or flows here

   token = "xoxb-your-bot-token-here"
   asyncio.run(
        send_chat_message(
            slack_credentials=SlackCredentials(token),
            channel="#prefect",
            text=f"Flow run {context.flow_run.name} completed :tada:"
        )
    )

if __name__ == "__main__":
    example_send_message_flow()

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Resources

Refer to the prefect-slack SDK documentation to explore all the capabilities of the prefect-slack library. For further assistance developing with Slack, consult the Slack documentation.

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Comparing SlackWebhook blocks

Prefect includes a built-in SlackWebhook block in prefect.blocks.notifications that requires no extra dependencies. The two blocks have different capabilities:
BlockBlock type slugBackendFeatures
prefect.blocks.notifications.SlackWebhookslack-webhookApprisenotify_type, allow_private_urls, Slack GovCloud support
prefect_slack.SlackWebhookslack-incoming-webhookSlack SDKget_client() for advanced SDK access
These are separate block types with different slugs, so a block created with one class cannot be loaded with the other.