Add initial support for webhook notifications

bootstrap-daemon/pvcbootstrapd.yaml.sample

@@ -89,3 +89,27 @@ pvc:
         base: "base.yml"
         pvc: "pvc.yml"
         bootstrap: "bootstrap.yml"
+
+  # Notification webhook configs
+  # These enable sending notifications from the bootstrap to a JSON webhook, e.g. a chat system
+  # This feature is optional; if this block is missing or `enabled: false`, nothing here will be used.
+  notifications:
+    enabled: true
+    # The URI endpoint for notifications
+    uri: https://mattermost.domain.tld/hooks/asecretstring
+    # The action to use (usually "post")
+    action: post
+    # Icons to use for various status types; embedded in the message with `{icon}`
+    icons:
+      begin: "🤞"       # A task is beginning
+      success: "✅"     # A task succeeded
+      failure: "❌"     # A task failed
+    # The webhook body elements; this is specific to the webhook target, and is converted into raw
+    # JSON before sending.
+    # Two special variables are used: "{icon}" displays one of the above icons, and "{message}" displays
+    # the actual message coming from pvcbootstrapd.
+    body:
+      channel: "mychannel"
+      username: "pvcbootstrapd"
+      text: "@person {icon} {message}"
+

bootstrap-daemon/pvcbootstrapd.yaml.template

@@ -31,3 +31,16 @@ pvc:
         base: "base.yml"
         pvc: "pvc.yml"
         bootstrap: "bootstrap.yml"
+  notifications:
+    enabled: false
+    uri: https://mattermost.domain.tld/hooks/asecretstring
+    action: post
+    icons:
+      begin: "🤞"       # A task is beginning
+      success: "✅"     # A task succeeded
+      failure: "❌"     # A task failed
+    body:
+      channel: "mychannel"
+      username: "pvcbootstrapd"
+      text: "@person {icon} {message}"
+

bootstrap-daemon/pvcbootstrapd/Daemon.py

@@ -25,6 +25,7 @@ import signal
 
 from sys import argv
 
+import pvcbootstrapd.lib.notifications as notifications
 import pvcbootstrapd.lib.dnsmasq as dnsmasqd
 import pvcbootstrapd.lib.db as db
 import pvcbootstrapd.lib.git as git
@@ -237,6 +238,8 @@ def entrypoint():
     print("|----------------------------------------------------------|")
     print("")
 
+    notifications.send_webhook(config, "begin", "Starting up pvcbootstrapd")
+
     # Initialize the database
     db.init_database(config)
 

bootstrap-daemon/pvcbootstrapd/lib/notifications.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+
+# notifications.py - PVC Cluster Auto-bootstrap Notifications library
+# Part of the Parallel Virtual Cluster (PVC) system
+#
+#    Copyright (C) 2018-2021 Joshua M. Boniface <joshua@boniface.me>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, version 3.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+###############################################################################
+
+import json
+import requests
+
+from celery.utils.log import get_task_logger
+
+
+logger = get_task_logger(__name__)
+
+
+def send_webhook(config, status, message):
+    """
+    Send an notification webhook
+    """
+
+    if not config.get('notifications', None) or not config['notifications']['enabled']:
+        return
+
+    logger.debug(f"Sending notification to {config['notifications']['uri']}")
+
+    # Get the body data
+    data = json.dumps(config['notifications']['body']).format(
+        icon=config['notifications']['icons'][status],
+        message=message
+    )
+    headers = {"content-type": "application/json"}
+
+    # Craft up a Requests endpoint set for this
+    requests_actions = {
+        "get": requests.get,
+        "post": requests.post,
+        "put": requests.put,
+        "patch": requests.patch,
+        "delete": requests.delete,
+        "options": requests.options,
+    }
+    action = config['notifications']["action"]
+
+    result = requests_actions[action](config['notifications']["uri"], headers=headers, data=data)
+
+    logger.debug(f"Result: {result}")