render-lab-tasks-slack

Slack messaging for Render Workflows. Initial subset: slack.postMessage. The other TypeScript Slack tasks and inbound webhook adapter are not yet ported.

This distribution is not yet on PyPI. From this repository:

uv pip install ./packages/tasks-slack

from render import TaskContext, Workflows
from render_lab_tasks_slack.tasks import app as slack_app, post_message

app = Workflows.from_workflows(slack_app)


@app.task(name="example.notify")
async def notify(ctx: TaskContext):
    return await ctx.run(post_message, {"text": "Hello from Python"})

Call app.start() from the workflow entry point. .tasks also exports post_message_impl(ctx, input, deps=...) for testing and re-registration under your own task name. Inject SlackDeps with fake SlackPort/SlackWebPort objects.

Contract

Input requires text and supports title, context, markdown, blocks, attachments, channel, and username. Explicit blocks (including an empty list) override generated blocks. Titles, context, and markdown generate Block Kit; double-star markdown bold becomes Slack single-star bold.

Delivery matches the TypeScript task:

  1. A channel plus SLACK_BOT_TOKEN uses chat.postMessage and returns {delivered: true, channel, ts}. This route sends text and blocks; legacy attachments and username are webhook-only, matching the TS implementation.
  2. Otherwise SLACK_WEBHOOK_URL is used. Its destination is fixed by Slack; the input channel is informational and is not sent in the webhook payload.
  3. Without a usable webhook, print the fallback text and return delivered: false. A bot token without a channel does not select the Web API route.

Absent optional result fields are omitted rather than serialized as null.

Environment

Variable Required Purpose
SLACK_WEBHOOK_URL No Incoming webhook destination
SLACK_BOT_TOKEN No Bot token for posting to an explicit channel

Credentials are read at execution time. HTTPX has a 30-second timeout and no automatic retries. Render retries failures up to four times with a 1000 ms base delay and 2x backoff. Slack Web API ok: false responses raise even with HTTP 200. Slack posts are not exactly-once: a retry after an uncertain delivery can duplicate a message. Webhook exceptions omit the credential-bearing URL.

Project links

Data verified by PyPI on Sep 4, 2026
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  • Released:
Newer release available (0.1.1)

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GitHub Statistics

Data verified by PyPI on Sep 4, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
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Requires

Python >=3.12

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