Source code for dagster_slack.hooks

from typing import Callable, Optional

from dagster._core.definitions import failure_hook, success_hook
from dagster._core.execution.context.hook import HookContext


def _default_status_message(context: HookContext, status: str) -> str:
    return "Op {op_name} on job {pipeline_name} {status}!\nRun ID: {run_id}".format(
        op_name=context.op.name,
        pipeline_name=context.pipeline_name,
        run_id=context.run_id,
        status=status,
    )


def _default_failure_message(context: HookContext) -> str:
    return _default_status_message(context, status="failed")


def _default_success_message(context: HookContext) -> str:
    return _default_status_message(context, status="succeeded")


[docs]def slack_on_failure(
    channel: str,
    message_fn: Callable[[HookContext], str] = _default_failure_message,
    dagit_base_url: Optional[str] = None,
):
    """Create a hook on step failure events that will message the given Slack channel.

    Args:
        channel (str): The channel to send the message to (e.g. "#my_channel")
        message_fn (Optional(Callable[[HookContext], str])): Function which takes in the HookContext
            outputs the message you want to send.
        dagit_base_url: (Optional[str]): The base url of your Dagit instance. Specify this to allow
            messages to include deeplinks to the specific pipeline run that triggered the hook.

    Examples:
        .. code-block:: python

            @slack_on_failure("#foo", dagit_base_url="http://localhost:3000")
            @job(...)
            def my_job():
                pass

        .. code-block:: python

            def my_message_fn(context: HookContext) -> str:
                return f"Op {context.op} failed!"

            @op
            def an_op(context):
                pass

            @job(...)
            def my_job():
                an_op.with_hooks(hook_defs={slack_on_failure("#foo", my_message_fn)})

    """

    @failure_hook(required_resource_keys={"slack"})
    def _hook(context: HookContext):
        text = message_fn(context)
        if dagit_base_url:
            text += "\n<{base_url}/instance/runs/{run_id}|View in Dagit>".format(
                base_url=dagit_base_url, run_id=context.run_id
            )

        context.resources.slack.chat_postMessage(channel=channel, text=text)  # type: ignore

    return _hook


[docs]def slack_on_success(
    channel: str,
    message_fn: Callable[[HookContext], str] = _default_success_message,
    dagit_base_url: Optional[str] = None,
):
    """Create a hook on step success events that will message the given Slack channel.

    Args:
        channel (str): The channel to send the message to (e.g. "#my_channel")
        message_fn (Optional(Callable[[HookContext], str])): Function which takes in the HookContext
            outputs the message you want to send.
        dagit_base_url: (Optional[str]): The base url of your Dagit instance. Specify this to allow
            messages to include deeplinks to the specific pipeline run that triggered the hook.

    Examples:
        .. code-block:: python

            @slack_on_success("#foo", dagit_base_url="http://localhost:3000")
            @job(...)
            def my_job():
                pass

        .. code-block:: python

            def my_message_fn(context: HookContext) -> str:
                return f"Op {context.op} worked!"

            @op
            def an_op(context):
                pass

            @job(...)
            def my_job():
                an_op.with_hooks(hook_defs={slack_on_success("#foo", my_message_fn)})

    """

    @success_hook(required_resource_keys={"slack"})
    def _hook(context: HookContext):
        text = message_fn(context)
        if dagit_base_url:
            text += "\n<{base_url}/instance/runs/{run_id}|View in Dagit>".format(
                base_url=dagit_base_url, run_id=context.run_id
            )

        context.resources.slack.chat_postMessage(channel=channel, text=text)  # type: ignore

    return _hook