Finish implementing notification rules

core/lib/notify.py

@@ -0,0 +1,38 @@
+import requests
+
+from core.util import logs
+
+NTFY_URL = "https://ntfy.sh"
+
+log = logs.get_logger(__name__)
+
+
+# Actual function to send a message to a topic
+def raw_sendmsg(msg, title=None, priority=None, tags=None, url=None, topic=None):
+    if url is None:
+        url = NTFY_URL
+    headers = {"Title": "Fisk"}
+    if title:
+        headers["Title"] = title
+    if priority:
+        headers["Priority"] = priority
+    if tags:
+        headers["Tags"] = tags
+    requests.post(
+        f"{url}/{topic}",
+        data=msg,
+        headers=headers,
+    )
+
+
+# Sendmsg helper to send a message to a user's notification settings
+def sendmsg(user, *args, **kwargs):
+    notification_settings = user.get_notification_settings()
+
+    if notification_settings.ntfy_topic is None:
+        # No topic set, so don't send
+        return
+    else:
+        topic = notification_settings.ntfy_topic
+
+    raw_sendmsg(*args, **kwargs, url=notification_settings.ntfy_url, topic=topic)

core/lib/rules.py

@@ -1,12 +1,76 @@
-from core.db.storage import db
+from yaml import dump, load
-from yaml import load, dump
-from yaml.scanner import ScannerError
 from yaml.parser import ParserError
+from yaml.scanner import ScannerError
+
+from core.db.storage import db
+from core.models import NotificationRule
+
 try:
-    from yaml import CLoader as Loader, CDumper as Dumper
+    from yaml import CDumper as Dumper
+    from yaml import CLoader as Loader
 except ImportError:
     from yaml import Loader, Dumper
 
+from core.lib.notify import sendmsg
+from core.util import logs
+
+log = logs.get_logger("rules")
+
+
+def rule_matched(rule, message, matched_fields):
+    title = f"Rule {rule.name} matched"
+
+    # Dump the message in YAML for readability
+    message = dump(message, Dumper=Dumper, default_flow_style=False)
+    matched_fields = ", ".join(matched_fields)
+
+    notify_message = f"{rule.name} matched on {matched_fields}\n{message}"
+    notify_message = notify_message.encode("utf-8", "replace")
+    sendmsg(rule.user, notify_message, title=title)
+
+
+def process_rules(data):
+    all_rules = NotificationRule.objects.filter(enabled=True)
+
+    for index, index_messages in data.items():
+        for message in index_messages:
+            for rule in all_rules:
+                parsed_rule = rule.parse()
+                if "index" not in parsed_rule:
+                    log.debug("No index specified in rule, skipping")
+                    continue
+                if "source" not in parsed_rule:
+                    log.debug("No source specified in rule, skipping")
+                    continue
+                rule_index = parsed_rule["index"]
+                rule_source = parsed_rule["source"]
+                if not type(rule_index) == list:
+                    rule_index = [rule_index]
+                if not type(rule_source) == list:
+                    rule_source = [rule_source]
+                if index not in rule_index:
+                    log.debug(f"{index} not in {rule_index}")
+                    continue
+                if message["src"] not in rule_source:
+                    log.debug(f"{message['src']} not in {rule_source}")
+                    continue
+
+                rule_field_length = len(parsed_rule.keys())
+                matched_field_number = 0
+                matched_fields = []
+                for field, value in parsed_rule.items():
+                    if not type(value) == list:
+                        value = [value]
+                    if field == "src":
+                        continue
+                    if field in message and message[field] in value:
+                        matched_field_number += 1
+                        matched_fields.append(field)
+                        print("Matched field", field, message[field], value)
+                if matched_field_number == rule_field_length - 2:
+                    rule_matched(rule, message, matched_fields)
+
+
 class NotificationRuleData(object):
     def __init__(self, user, data):
         self.user = user

core/management/commands/processing.py

@@ -0,0 +1,22 @@
+from django.core.management.base import BaseCommand, CommandError
+from redis import StrictRedis
+from core.util import logs
+from core.lib.rules import process_rules
+import msgpack
+
+log = logs.get_logger("processing")
+
+class Command(BaseCommand):
+    def handle(self, *args, **options):
+        r = StrictRedis(unix_socket_path="/var/run/socks/redis.sock", db=0)
+        p = r.pubsub()
+        p.psubscribe("messages")
+        for message in p.listen():
+            if message:
+                if message["channel"] == b"messages":
+                    data = message["data"]
+                    try:
+                        unpacked = msgpack.unpackb(data, raw=False)
+                    except TypeError:
+                        continue
+                    process_rules(unpacked)

core/migrations/0012_notificationrule.py

@@ -1,8 +1,8 @@
 # Generated by Django 4.1.3 on 2023-01-12 15:12
 
+import django.db.models.deletion
 from django.conf import settings
 from django.db import migrations, models
-import django.db.models.deletion
 
 
 class Migration(migrations.Migration):

core/migrations/0013_notificationsettings.py

@@ -1,8 +1,8 @@
 # Generated by Django 4.1.3 on 2023-01-12 15:25
 
+import django.db.models.deletion
 from django.conf import settings
 from django.db import migrations, models
-import django.db.models.deletion
 
 
 class Migration(migrations.Migration):

core/models.py

@@ -3,9 +3,16 @@ import logging
 import stripe
 from django.contrib.auth.models import AbstractUser
 from django.db import models
+from yaml import load
+from yaml.parser import ParserError
+from yaml.scanner import ScannerError
 
 from core.lib.customers import get_or_create, update_customer_fields
 
+try:
+    from yaml import CLoader as Loader
+except ImportError:
+    from yaml import Loader
 logger = logging.getLogger(__name__)
 
 
@@ -60,6 +67,9 @@ class User(AbstractUser):
         plan_list = [plan.name for plan in self.plans.all()]
         return plan in plan_list
 
+    def get_notification_settings(self):
+        return NotificationSettings.objects.get_or_create(user=self)[0]
+
 
 class Session(models.Model):
     user = models.ForeignKey(User, on_delete=models.CASCADE)
@@ -131,7 +141,14 @@ class NotificationRule(models.Model):
     data = models.TextField()
 
     def __str__(self):
-        return f"{self.user} - {self.rule}"
+        return f"{self.user} - {self.name}"
+
+    def parse(self):
+        try:
+            parsed = load(self.data, Loader=Loader)
+        except (ScannerError, ParserError) as e:
+            raise ValueError(f"Invalid YAML: {e}")
+        return parsed
 
 
 class NotificationSettings(models.Model):

core/views/notifications.py

@@ -1,8 +1,9 @@
 from django.contrib.auth.mixins import LoginRequiredMixin
+
 from core.forms import NotificationRuleForm, NotificationSettingsForm
 from core.models import NotificationRule, NotificationSettings
+from core.views.helpers import ObjectCreate, ObjectDelete, ObjectList, ObjectUpdate
 
-from core.views.helpers import ObjectCreate, ObjectList, ObjectUpdate, ObjectDelete
 
 # Notifications - we create a new notification settings object if there isn't one
 # Hence, there is only an update view, not a create view.
@@ -28,6 +29,7 @@ class NotificationsUpdate(LoginRequiredMixin, ObjectUpdate):
         )
         return notification_settings
 
+
 class RuleList(LoginRequiredMixin, ObjectList):
     list_template = "partials/rule-list.html"
     model = NotificationRule

docker-compose.yml

@@ -30,6 +30,34 @@ services:
       - pathogen
       - elastic
 
+  processing:
+    image: pathogen/neptune:latest
+    container_name: processing_neptune
+    build:
+      context: .
+      args:
+        OPERATION: ${OPERATION}
+    command: sh -c '. /venv/bin/activate && python manage.py processing'
+    volumes:
+      - ${PORTAINER_GIT_DIR}:/code
+      - ${PORTAINER_GIT_DIR}/docker/uwsgi.ini:/conf/uwsgi.ini
+      #- ${APP_LOCAL_SETTINGS}:/code/app/local_settings.py
+      - ${APP_DATABASE_FILE}:/code/db.sqlite3
+      - neptune_static:${STATIC_ROOT}
+    env_file:
+      - stack.env
+    volumes_from:
+      - tmp
+    depends_on:
+      redis:
+        condition: service_healthy
+      migration:
+        condition: service_started
+      collectstatic:
+        condition: service_started
+    networks:
+      - default
+
   migration:
     image: pathogen/neptune:latest
     container_name: migration_neptune
@@ -62,6 +90,8 @@ services:
       - ${APP_LOCAL_SETTINGS}:/code/app/local_settings.py
       - ${APP_DATABASE_FILE}:/code/db.sqlite3
       - neptune_static:${STATIC_ROOT}
+    volumes_from:
+      - tmp
     env_file:
       - stack.env
     depends_on:
@@ -108,7 +138,7 @@ services:
          soft: 65535
          hard: 65535
     volumes:
-        - ${PORTAINER_GIT_DIR}/docker/redis.conf:/etc/redis.conf
+      - ${PORTAINER_GIT_DIR}/docker/redis.conf:/etc/redis.conf
     volumes_from:
       - tmp
     healthcheck:
@@ -116,6 +146,9 @@ services:
       interval: 2s
       timeout: 2s
       retries: 15
+    networks:
+      - default
+      - pathogen
 
 networks:
   default:

docker/redis.conf

@@ -1,2 +1,5 @@
 unixsocket /var/run/socks/redis.sock
 unixsocketperm 777
+
+# For Monolith PubSub
+port 6379

requirements.txt

@@ -18,3 +18,4 @@ sortedcontainers
 django-debug-toolbar
 django-debug-toolbar-template-profiler
 orjson
+msgpack