Source code for airflow.contrib.hooks.slack_webhook_hook

# -*- coding: utf-8 -*-
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#
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})