🐛 rabbitmq queue name prefix is unique during the lifecycle of the container

packages/service-library/src/servicelib/rabbitmq/_utils.py

@@ -1,5 +1,9 @@
 import logging
+import random
 import socket
+import string
+from pathlib import Path
+from tempfile import gettempdir
 from typing import Any, Final
 
 import aio_pika
@@ -19,6 +23,12 @@
 
 RABBIT_QUEUE_MESSAGE_DEFAULT_TTL_MS: Final[int] = 15 * _MINUTE * 1000
 
+_PATH_UNIQUE_RABBIT_QUEUE_PREFIX: Final[Path] = (
+    Path(gettempdir()) / f"{__name__}_unique_rabbit_queue_prefix"
+)
+_ALPHABET: Final[str] = string.ascii_letters + string.digits
+_CHAR_COUNT: Final[NonNegativeInt] = 6
+
 
 class RabbitMQRetryPolicyUponInitialization:
     """Retry policy upon service initialization"""
@@ -50,8 +60,26 @@ async def wait_till_rabbitmq_responsive(url: str) -> bool:
     return await is_rabbitmq_responsive(url)
 
 
+def _get_unique_rabbit_queue_name_prefix() -> str:
+    # NOTE: this prefix is guaranteed to be unique for the entire lifecycle of the docker container
+    # Why is this desiarable?
+    # 1. the code base makes the above assumption, otherwise subcscribers and consumers do not work
+    # 2. enables restaratability of production deployemnts, where containers are frist created and
+    # then killed; avoids overlapping queue names and errors during start
+    prefix: str | None = None
+    if _PATH_UNIQUE_RABBIT_QUEUE_PREFIX.exists():
+        prefix = _PATH_UNIQUE_RABBIT_QUEUE_PREFIX.read_text()
+
+    if prefix is None:
+        random_str = "".join(random.choices(_ALPHABET, k=_CHAR_COUNT))  # noqa: S311
+        prefix = f"{socket.gethostname()}_{random_str}"
+        _PATH_UNIQUE_RABBIT_QUEUE_PREFIX.write_text(prefix)
+
+    return prefix
+
+
 def get_rabbitmq_client_unique_name(base_name: str) -> str:
-    return f"{base_name}_{socket.gethostname()}"
+    return f"{base_name}_{_get_unique_rabbit_queue_name_prefix()}"
 
 
 async def declare_queue(