Fetch signatures from galaxy after the dependency resolver runs (#80334)

Reduce the number of Galaxy API calls made during dependency resolution by fetching remote signatures afterwards, since these are not used in backtracking.

Reduce the verbosity to `-vvvv` (to match other Galaxy API calls) to see this activity.

Co-authored-by: Sviatoslav Sydorenko <webknjaz@redhat.com>

changelogs/fragments/80334-reduce-ansible-galaxy-api-calls.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ansible-galaxy - reduce API calls to servers by fetching signatures only for final candidates.

lib/ansible/galaxy/api.py

@@ -926,8 +926,7 @@ class GalaxyAPI:
         try:
             signatures = data["signatures"]
         except KeyError:
-            # Noisy since this is used by the dep resolver, so require more verbosity than Galaxy calls
-            display.vvvvvv(f"Server {self.api_server} has not signed {namespace}.{name}:{version}")
+            display.vvvv(f"Server {self.api_server} has not signed {namespace}.{name}:{version}")
             return []
         else:
             return [signature_info["signature"] for signature_info in signatures]

lib/ansible/galaxy/collection/__init__.py

@@ -769,6 +769,9 @@ def install_collections(
                     "Skipping signature verification."
                 )
 
+            if concrete_coll_pin.type == 'galaxy':
+                concrete_coll_pin = concrete_coll_pin.with_signatures_repopulated()
+
             try:
                 install(concrete_coll_pin, output_path, artifacts_manager)
             except AnsibleError as err:

lib/ansible/galaxy/dependency_resolution/dataclasses.py

@@ -27,7 +27,7 @@ if t.TYPE_CHECKING:
     )
 
 
-from ansible.errors import AnsibleError
+from ansible.errors import AnsibleError, AnsibleAssertionError
 from ansible.galaxy.api import GalaxyAPI
 from ansible.galaxy.collection import HAS_PACKAGING, PkgReq
 from ansible.module_utils._text import to_bytes, to_native, to_text
@@ -584,3 +584,13 @@ class Candidate(
 
     def __init__(self, *args, **kwargs):
         super(Candidate, self).__init__()
+
+    def with_signatures_repopulated(self):  # type: (Candidate) -> Candidate
+        """Populate a new Candidate instance with Galaxy signatures.
+        :raises AnsibleAssertionError: If the supplied candidate is not sourced from a Galaxy-like index.
+        """
+        if self.type != 'galaxy':
+            raise AnsibleAssertionError(f"Invalid collection type for {self!r}: unable to get signatures from a galaxy server.")
+
+        signatures = self.src.get_collection_signatures(self.namespace, self.name, self.ver)
+        return self.__class__(self.fqcn, self.ver, self.src, self.type, frozenset([*self.signatures, *signatures]))

lib/ansible/galaxy/dependency_resolution/providers.py

@@ -392,7 +392,6 @@ class CollectionDependencyProviderBase(AbstractProvider):
 
             if not unsatisfied:
                 if self._include_signatures:
-                    signatures = src_server.get_collection_signatures(first_req.namespace, first_req.name, version)
                     for extra_source in extra_signature_sources:
                         signatures.append(get_signature_from_source(extra_source))
                 latest_matches.append(

test/integration/targets/ansible-galaxy-collection/tasks/install.yml

@@ -5,7 +5,7 @@
     state: directory
 
 - name: install simple collection from first accessible server
-  command: ansible-galaxy collection install namespace1.name1 {{ galaxy_verbosity }}
+  command: ansible-galaxy collection install namespace1.name1 -vvvv
   environment:
     ANSIBLE_COLLECTIONS_PATH: '{{ galaxy_dir }}/ansible_collections'
   register: from_first_good_server
@@ -30,6 +30,7 @@
     - install_normal_files.files[1].path | basename in ['MANIFEST.json', 'FILES.json', 'README.md']
     - install_normal_files.files[2].path | basename in ['MANIFEST.json', 'FILES.json', 'README.md']
     - (install_normal_manifest.content | b64decode | from_json).collection_info.version == '1.0.9'
+    - 'from_first_good_server.stdout|regex_findall("has not signed namespace1\.name1")|length == 1'
 
 - name: Remove the collection
   file: