Add limit to unassociate [RHELDST-20725]

We want to perform garbage collection in batches to reduce the amount of
resources it consumes and avoid out of memory exceptions. Unit
association criteria has a limit field which we could use for
batching requests.

pubtools/pulplib/_impl/client/client.py

@@ -775,7 +775,7 @@ def _do_associate(self, src_repo_id, dest_repo_id, criteria=None, raw_options=No
             self._do_request, method="POST", url=url, json=body
         )
 
-    def _do_unassociate(self, repo_id, criteria=None):
+    def _do_unassociate(self, repo_id, criteria=None, limit=None):
         url = os.path.join(
             self._url, "pulp/api/v2/repositories/%s/actions/unassociate/" % repo_id
         )
@@ -800,6 +800,9 @@ def _do_unassociate(self, repo_id, criteria=None):
             else:
                 body["criteria"]["filters"] = {"unit": pulp_search.filters}
 
+        if limit:
+            body["criteria"]["limit"] = limit
+
         LOG.debug("Submitting %s unassociate: %s", url, body)
 
         return self._task_executor.submit(

pubtools/pulplib/_impl/fake/client.py

@@ -404,7 +404,7 @@ def do_next_upload(checksum, size):
 
         return out
 
-    def _do_unassociate(self, repo_id, criteria=None):
+    def _do_unassociate(self, repo_id, criteria=None, limit=None):
         repo_f = self.get_repository(repo_id)
         if repo_f.exception():
             return repo_f
@@ -431,7 +431,9 @@ def _do_unassociate(self, repo_id, criteria=None):
 
             for unit_with_key in units_with_key:
                 unit = unit_with_key["unit"]
-                if match_object(criteria, unit):
+                if match_object(criteria, unit) and (
+                    not limit or len(removed_units) <= limit
+                ):
                     removed_units.add(unit)
                 else:
                     kept_keys.add(unit_with_key["key"])

pubtools/pulplib/_impl/model/repository/base.py

@@ -696,7 +696,13 @@ def remove_content(self, criteria=None, **kwargs):
                     Matcher.in_(type_ids),  # Criteria.with_field_in is deprecated
                 )
 
-        return f_proxy(self._client._do_unassociate(self.id, criteria=criteria))
+        return f_proxy(
+            self._client._do_unassociate(
+                self.id,
+                criteria=criteria,
+                limit=kwargs.get("limit"),
+            )
+        )
 
     @classmethod
     def from_data(cls, data):