dynamically update tasks on saved changes to restream configs

concierge/admin.py

@@ -7,7 +7,7 @@ class IdentityAdmin(admin.ModelAdmin):
 
 
 class TaskAdmin(admin.ModelAdmin):
-    fields = ['stream', 'type', 'configuration', 'claimed_by']
+    fields = ['stream', 'type', 'config_id', 'configuration', 'claimed_by']
 
 
 admin.site.register(Identity, IdentityAdmin)

concierge/migrations/0006_task_config_id.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.0.6 on 2020-05-31 09:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('concierge', '0005_auto_20200426_2007'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='task',
+            name='config_id',
+            field=models.IntegerField(default=0),
+            preserve_default=False,
+        ),
+    ]

concierge/models.py

@@ -21,5 +21,6 @@ class Task(models.Model):
     uuid = models.UUIDField(unique=True, default=uuid.uuid4)
     stream = models.ForeignKey(Stream, on_delete=models.CASCADE)
     type = models.CharField(max_length=100)
+    config_id = models.IntegerField()
     configuration = models.TextField()
     claimed_by = models.ForeignKey(Identity, null=True, blank=True, on_delete=models.CASCADE)

restream/models.py

@@ -3,6 +3,7 @@ from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
 from django.db.models.signals import pre_delete
 from portier.common import handlers
+import json
 
 from rtmp.models import Stream
 
@@ -26,5 +27,14 @@ class RestreamConfig(models.Model):
     def __str__(self):
         return '{} to {}'.format(self.stream, self.name)
 
+    def get_json_config(self):
+        config = {
+            'name': self.name,
+            'app': self.stream.application.name,
+            'stream': str(self.stream.stream),
+            'target': self.target
+        }
+        return json.dumps(config)
+
 
 pre_delete.connect(handlers.remove_obj_perms_connected_with_user, sender=RestreamConfig)

restream/signals.py

@@ -1,23 +1,35 @@
 from django.dispatch import receiver
+from django.db.models.signals import post_save
 from rtmp.signals import stream_active
 from .models import RestreamConfig
 from rtmp.models import Stream
 from concierge.models import Task
-import json
 
 
 @receiver(stream_active)
 def create_tasks(sender, **kwargs):
     stream = Stream.objects.get(stream=kwargs['stream'])
     instances = RestreamConfig.objects.filter(active=True, stream=stream)
-    for inst in instances:
-        config = {
-            'name': inst.name,
-            'app': inst.stream.application.name,
-            'stream': str(inst.stream.stream),
-            'target': inst.target
-        }
-
-        json_config = json.dumps(config)
-        task = Task(stream=stream, type='restream', configuration=json_config)
+    for instance in instances:
+        task = Task(stream=instance.stream, type='restream', config_id=instance.id,
+                    configuration=instance.get_json_config())
+        task.save()
+
+
+@receiver(post_save, sender=RestreamConfig)
+def update_tasks(sender, **kwargs):
+    instance = kwargs['instance']
+    # TODO: check for breaking changes using update_fields. This needs custom save_model functions though.
+
+    # Get the current task instance if it exists, and remove it
+    try:
+        task = Task.objects.filter(config_id=instance.id).get()
+        task.delete()
+    except Task.DoesNotExist:
+        pass
+
+    # If the configuration is set to be active, and the stream is published, (re)create new task
+    if instance.active and instance.stream.publish_counter > 0:
+        task = Task(stream=instance.stream, type='restream', config_id=instance.id,
+                    configuration=instance.get_json_config())
         task.save()

rtmp/migrations/0005_auto_20200531_0951.py

@@ -0,0 +1,39 @@
+# Generated by Django 3.0.6 on 2020-05-31 09:51
+
+from django.db import migrations, models
+import django.db.models.deletion
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rtmp', '0004_auto_20200501_1302'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='application',
+            options={'verbose_name': 'RTMP application', 'verbose_name_plural': 'RTMP applications'},
+        ),
+        migrations.AlterField(
+            model_name='application',
+            name='name',
+            field=models.CharField(help_text='RTMP application name', max_length=100, unique=True),
+        ),
+        migrations.AlterField(
+            model_name='stream',
+            name='application',
+            field=models.ForeignKey(help_text='Application which the stream is assigned to', on_delete=django.db.models.deletion.CASCADE, to='rtmp.Application'),
+        ),
+        migrations.AlterField(
+            model_name='stream',
+            name='name',
+            field=models.CharField(help_text='Name for this stream', max_length=100),
+        ),
+        migrations.AlterField(
+            model_name='stream',
+            name='stream',
+            field=models.UUIDField(default=uuid.uuid4, help_text='Stream ID for this stream', unique=True),
+        ),
+    ]