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import json
from airflow.hooks.http_hook import HttpHook
from airflow.exceptions import AirflowException
[docs]class SlackWebhookHook(HttpHook):
"""
This hook allows you to post messages to Slack using incoming webhooks.
Takes both Slack webhook token directly and connection that has Slack webhook token.
If both supplied, http_conn_id will be used as base_url,
and webhook_token will be taken as endpoint, the relative path of the url.
Each Slack webhook token can be pre-configured to use a specific channel, username and
icon. You can override these defaults in this hook.
:param http_conn_id: connection that has Slack webhook token in the extra field
:type http_conn_id: str
:param webhook_token: Slack webhook token
:type webhook_token: str
:param message: The message you want to send on Slack
:type message: str
:param attachments: The attachments to send on Slack. Should be a list of
dictionaries representing Slack attachments.
:type attachments: list
:param channel: The channel the message should be posted to
:type channel: str
:param username: The username to post to slack with
:type username: str
:param icon_emoji: The emoji to use as icon for the user posting to Slack
:type icon_emoji: str
:param link_names: Whether or not to find and link channel and usernames in your
message
:type link_names: bool
:param proxy: Proxy to use to make the Slack webhook call
:type proxy: str
"""
def __init__(self,
http_conn_id=None,
webhook_token=None,
message="",
attachments=None,
channel=None,
username=None,
icon_emoji=None,
link_names=False,
proxy=None,
*args,
**kwargs
):
super(SlackWebhookHook, self).__init__(http_conn_id=http_conn_id, *args, **kwargs)
self.webhook_token = self._get_token(webhook_token, http_conn_id)
self.message = message
self.attachments = attachments
self.channel = channel
self.username = username
self.icon_emoji = icon_emoji
self.link_names = link_names
self.proxy = proxy
[docs] def _get_token(self, token, http_conn_id):
"""
Given either a manually set token or a conn_id, return the webhook_token to use
:param token: The manually provided token
:type token: str
:param http_conn_id: The conn_id provided
:type http_conn_id: str
:return: webhook_token (str) to use
"""
if token:
return token
elif http_conn_id:
conn = self.get_connection(http_conn_id)
extra = conn.extra_dejson
return extra.get('webhook_token', '')
else:
raise AirflowException('Cannot get token: No valid Slack '
'webhook token nor conn_id supplied')
[docs] def _build_slack_message(self):
"""
Construct the Slack message. All relevant parameters are combined here to a valid
Slack json message
:return: Slack message (str) to send
"""
cmd = {}
if self.channel:
cmd['channel'] = self.channel
if self.username:
cmd['username'] = self.username
if self.icon_emoji:
cmd['icon_emoji'] = self.icon_emoji
if self.link_names:
cmd['link_names'] = 1
if self.attachments:
cmd['attachments'] = self.attachments
cmd['text'] = self.message
return json.dumps(cmd)
[docs] def execute(self):
"""
Remote Popen (actually execute the slack webhook call)
"""
proxies = {}
if self.proxy:
# we only need https proxy for Slack, as the endpoint is https
proxies = {'https': self.proxy}
slack_message = self._build_slack_message()
self.run(endpoint=self.webhook_token,
data=slack_message,
headers={'Content-type': 'application/json'},
extra_options={'proxies': proxies})