Mirror release version alias writes [RHELDST-28333]

exodus_gw/aws/dynamodb.py

@@ -25,12 +25,14 @@ def __init__(
         from_date: str,
         env_obj: Environment | None = None,
         deadline: datetime | None = None,
+        mirror_writes: bool = False,
     ):
         self.env = env
         self.settings = settings
         self.from_date = from_date
         self.env_obj = env_obj or get_environment(env)
         self.deadline = deadline
+        self.mirror_writes = mirror_writes
         self.client = DynamoDBClientWrapper(self.env_obj.aws_profile).client
         self._lock = Lock()
         self._definitions = None
@@ -208,6 +210,30 @@ def query_definitions(self) -> dict[str, Any]:
             out = json.loads(item_json)
         return out
 
+    def uris_for_item(self, item) -> list[str]:
+        """Returns all URIs to be written for the given item.
+
+        In practice, always returns either one or two URIs depending on
+        configured aliases and other settings, though the caller should
+        assume any number of URIs.
+        """
+
+        # Resolve aliases. We only write to the deepest path
+        # after all alias resolution, hence only using the
+        # first result from uri_alias.
+        uris = [uri_alias(item.web_uri, self.aliases_for_write)[0]]
+
+        # We only want to mirror writes for release ver aliases. Recalculating
+        # the aliases completely is a bit inefficient, but I'd rather not
+        # duplicate any alias logic.
+        if (
+            self.mirror_writes
+            and uri_alias(item.web_uri, self._aliases(["releasever_alias"]))[0]
+            != item.web_uri
+        ):
+            uris.append(item.web_uri)
+        return uris
+
     def create_request(
         self,
         items: list[models.Item],
@@ -216,8 +242,6 @@ def create_request(
         """Create the dictionary structure expected by batch_write_item."""
         table_name = self.env_obj.table
         request: dict[str, list[Any]] = {table_name: []}
-        uri_aliases = self.aliases_for_write
-
         for item in items:
             # Items carry their own from_date. This effectively resolves
             # conflicts in the case of two publishes updating the same web_uri
@@ -226,35 +250,32 @@ def create_request(
             # updated timestamp.
             from_date = str(item.updated)
 
-            # Resolve aliases. We only write to the deepest path
-            # after all alias resolution, hence only using the
-            # first result from uri_alias.
-            web_uri = uri_alias(item.web_uri, uri_aliases)[0]
-
-            if delete:
-                request[table_name].append(
-                    {
-                        "DeleteRequest": {
-                            "Key": {
-                                "from_date": {"S": from_date},
-                                "web_uri": {"S": web_uri},
+            for web_uri in self.uris_for_item(item):
+                if delete:
+                    request[table_name].append(
+                        {
+                            "DeleteRequest": {
+                                "Key": {
+                                    "from_date": {"S": from_date},
+                                    "web_uri": {"S": web_uri},
+                                }
                             }
                         }
-                    }
-                )
-            else:
-                request[table_name].append(
-                    {
-                        "PutRequest": {
-                            "Item": {
-                                "from_date": {"S": from_date},
-                                "web_uri": {"S": web_uri},
-                                "object_key": {"S": item.object_key},
-                                "content_type": {"S": item.content_type},
+                    )
+                else:
+                    request[table_name].append(
+                        {
+                            "PutRequest": {
+                                "Item": {
+                                    "from_date": {"S": from_date},
+                                    "web_uri": {"S": web_uri},
+                                    "object_key": {"S": item.object_key},
+                                    "content_type": {"S": item.content_type},
+                                }
                             }
                         }
-                    }
-                )
+                    )
+
         return request
 
     def create_config_request(self, config):

exodus_gw/settings.py

@@ -475,6 +475,10 @@ class Settings(BaseSettings):
     s3_pool_size: int = 3
     """Number of S3 clients to cache"""
 
+    mirror_writes_enabled: bool = True
+    """Whether both the original url and releasever alias are written during
+     phase 1 commits."""
+
     model_config = SettingsConfigDict(env_prefix="exodus_gw_")
 
 

exodus_gw/worker/publish.py

@@ -186,9 +186,14 @@ def dynamodb(self):
                 self.from_date,
                 self.env_obj,
                 self.task.deadline,
+                self.should_mirror_writes,
             )
         return self._dynamodb
 
+    @property
+    def should_mirror_writes(self):
+        return False
+
     @property
     def task_ready(self) -> bool:
         task = self.task
@@ -446,6 +451,10 @@ class CommitPhase1(CommitBase):
     # phase1 commit is allowed to proceed in either of these states.
     PUBLISH_STATES = [PublishStates.committing, PublishStates.pending]
 
+    @property
+    def should_mirror_writes(self):
+        return self.settings.mirror_writes_enabled
+
     @property
     def item_select(self):
         # Query for items to be handled by phase1 commit.