Reverts from asyncio

src/pubtools/_marketplacesvm/tasks/push/command.py

@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
-import asyncio
 import datetime
 import json
 import logging
@@ -259,7 +258,7 @@ def _push_pre_publish(self, upload_result: List[UPLOAD_RESULT]) -> List[UPLOAD_R
             res.append((mapped_item, starmap_query))
         return res
 
-    async def _push_publish(self, upload_result: List[UPLOAD_RESULT]) -> List[Dict[str, Any]]:
+    def _push_publish(self, upload_result: List[UPLOAD_RESULT]) -> List[Dict[str, Any]]:
         """
         Perform the publishing for the the VM images.
 
@@ -270,7 +269,7 @@ async def _push_publish(self, upload_result: List[UPLOAD_RESULT]) -> List[Dict[s
             Dictionary with the resulting operation for the Collector service.
         """
 
-        async def push_function(mapped_item, marketplace, starmap_query) -> Dict[str, Any]:
+        def push_function(mapped_item, marketplace, starmap_query) -> Dict[str, Any]:
             # Get the push item for the current marketplace
             pi = mapped_item.get_push_item_for_marketplace(marketplace)
 
@@ -304,17 +303,22 @@ async def push_function(mapped_item, marketplace, starmap_query) -> Dict[str, An
 
         res_output = []
 
-        # This publishes in parallel since there shouldn't be collision between the
-        # differing marketplaces.
-        res_output.extend(
-            await asyncio.gather(
-                *(
-                    push_function(mapped_item, marketplace, starmap_query)
-                    for mapped_item, starmap_query in upload_result
-                    for marketplace in mapped_item.marketplaces
-                )
+        # Sequentially publish the uploaded items for each marketplace.
+        # It's recommended to do this operation sequentially since parallel publishing in the
+        # same marketplace may cause errors due to the change set already being applied.
+        for mapped_item, starmap_query in upload_result:
+            to_await = []
+            executor = Executors.thread_pool(
+                name="pubtools-marketplacesvm-push-regions",
+                max_workers=min(max(len(mapped_item.marketplaces), 1), self._PROCESS_THREADS),
             )
-        )
+            for marketplace in mapped_item.marketplaces:
+                to_await.append(
+                    executor.submit(push_function, mapped_item, marketplace, starmap_query)
+                )
+
+                for f_out in to_await:
+                    res_output.append(f_out.result())
 
         return res_output
 
@@ -411,7 +415,7 @@ def run(self, collect_results: bool = True, allow_empty_targets: bool = False) -
         upload_result = self._push_pre_publish(upload_result)
 
         # 4 - Publish the uploaded images letting the external function to control the threads
-        result = asyncio.run(self._push_publish(upload_result))
+        result = self._push_publish(upload_result)
 
         # process result for failures
         failed = False