libretime · dakriy · Mar 21, 2025 · Mar 21, 2025 · Mar 21, 2025 · Mar 21, 2025
diff --git a/docs/admin-manual/tutorials/setup-high-availability-playout.md b/docs/admin-manual/tutorials/setup-high-availability-playout.md
@@ -0,0 +1,54 @@
+---
+title: How to setup high availability playout
+---
+
+This tutorial walks you through the steps required to setup playout for high availability.

+:::info
+
+We assume you have a way to consume multiple audio inputs (for example icecast). For terrestrial HA you might consider
+having an audio processor with switching and silence detection capabilities.
+
+:::
+
+## 1. Initial LibreTime setup
+
+When initially setting up LibreTime, first setup the components in
+the [Create the schedule block](../../contributor-manual/design/architecture.md#create-the-schedule) along with
+the message queue.
+
+If you are going provide multiple icecast or shoutcast streams, please make sure to set all streams you want visible
+from the LibreTime widget to enabled in this blocks config file.
+
+## 2. Setup your playout blocks
+
+Create your [Play the schedule blocks](../../contributor-manual/design/architecture.md#play-the-schedule).
+
+You will need one for each replication you want, and any additional playout blocks you may want. For example, if you
+are running a terrestrial radio station, you may have two playout blocks for your radio processor, and an additional
+one for a non-HA icecast instance.
+
+The playout blocks should each contain the LibreTime playout service as well as a liquidsoap service. They should be
+able to talk to the message queue and the LibreTime API.
+
+## 3. Configure each playout block
+
+Create a config file for each playout block. Only enable the output you want from this block. For example, you may
+configure two blocks for system output to an audio card, and another block for streaming to icecast.
+
+The sections that need configured are
+
+- [General](../configuration.md#general)
+  - Only `public_url` and `api_key` are needed. `cache_ahead_hours` currently has
+    no effect as playout is hardcoded to cache ahead 1 day.
+- [RabbitMQ](../configuration.md#rabbitmq)
+- [Playout](../configuration.md#playout)
+  - Make sure to configure the associated liquidsoap host for this block.
+- [Liquidsoap](../configuration.md#liquidsoap)
+- [Stream](../configuration.md#stream)
+  - Configure the stream outputs you want this playout block to provide and disable the rest.
+
+## 4. Testing
+
+Start all the playout blocks and confirm they get the schedule from the LibreTime web server. Additionally and verify
+their outputs are correct.
diff --git a/legacy/application/models/RabbitMq.php b/legacy/application/models/RabbitMq.php
@@ -57,7 +57,7 @@ public static function SendMessageToPypo($event_type, $md)
 
         $exchange = 'airtime-pypo';
         $data = json_encode($md, JSON_FORCE_OBJECT);
-        self::sendMessage($exchange, 'direct', true, $data);
+        self::sendMessage($exchange, 'fanout', true, $data);
     }
 
     public static function SendMessageToMediaMonitor($event_type, $md)
@@ -88,7 +88,7 @@ public static function SendMessageToShowRecorder($event_type)
         }
         $data = json_encode($temp);
 
-        self::sendMessage($exchange, 'direct', true, $data);
+        self::sendMessage($exchange, 'fanout', true, $data);
     }
 
     public static function SendMessageToAnalyzer(

diff --git a/playout/libretime_playout/message_handler.py b/playout/libretime_playout/message_handler.py
@@ -27,8 +27,13 @@ def __init__(
         self.fetch_queue = fetch_queue
 
     def get_consumers(self, Consumer, channel):
-        exchange = Exchange("airtime-pypo", "direct", durable=True, auto_delete=True)
-        queues = [Queue("pypo-fetch", exchange=exchange, key="foo")]
+        exchange = Exchange("airtime-pypo", "fanout", durable=True, auto_delete=True)
+        # RabbitMQ says to avoid temporary queues with well-known names
+        # https://www.rabbitmq.com/docs/queues#shared-temporary-queues
+        # A server named queue that expires is used so that if the service
+        # gets temporarily disconnected, no events are lost, but the queue is
+        # automatically cleaned up on shutdown.
+        queues = [Queue("", exchange=exchange, expires=30.0)]
 
         return [
             Consumer(queues, callbacks=[self.on_message], accept=["text/plain"]),

diff --git a/playout/libretime_playout/player/fetch.py b/playout/libretime_playout/player/fetch.py
@@ -154,7 +154,6 @@ def set_bootstrap_variables(self) -> None:
         except OSError as exception:
             logger.exception(exception)
 
-        self.liquidsoap.clear_all_queues()
         self.liquidsoap.clear_queue_tracker()
 
     def update_liquidsoap_stream_format(