ansible-galaxy collection install retry improvements (#80180)

* clog frag

* Fix retries so that each explicit call to _call_galaxy is retried for the correct number of attempts. Fixes #80174

* Extend retry logic to common URL related connection errors. Fixes #80170

* Extend retries to downloading artifacts

* Extend param docs for change

* Rework the exception handling

* Don't be overly broad, reduce to TimeoutError, and BadStatusLine for now

* _download_file needs to raise AnsibleError.orig_exc

* Remove unused import

* Add IncompleteRead

* Add socket.timeout for py39

* Add 502 to retry codes

* Move http error code checking first

* Use itertools.tee to replay the backoff_iterator instead of using a callable

* Actually set a CLI default of 60s for timeout, to prevent implicit galaxy from using 10s as default from Request.open

* Import typing

* fix type hints

* Use http.HTTPStatus instead of int HTTP error codes where feasible

* Split exception handling

Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>

* Add missing import

---------

Co-authored-by: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>

changelogs/fragments/galaxy-improve-retries.yml

@@ -0,0 +1,3 @@
+bugfixes:
+- ansible-galaxy - Improve retries for collection installs, to properly retry, and extend retry logic to common URL related connection errors
+  (https://github.com/ansible/ansible/issues/80170 https://github.com/ansible/ansible/issues/80174)

lib/ansible/cli/galaxy.py

@@ -244,7 +244,7 @@ class GalaxyCLI(CLI):
                             help='The Ansible Galaxy API key which can be found at '
                                  'https://galaxy.ansible.com/me/preferences.')
         common.add_argument('-c', '--ignore-certs', action='store_true', dest='ignore_certs', help='Ignore SSL certificate validation errors.', default=None)
-        common.add_argument('--timeout', dest='timeout', type=int,
+        common.add_argument('--timeout', dest='timeout', type=int, default=60,
                             help="The time to wait for operations against the galaxy server, defaults to 60s.")
 
         opt_help.add_verbosity_options(common)

lib/ansible/galaxy/api.py

@@ -11,12 +11,15 @@ import functools
 import hashlib
 import json
 import os
+import socket
 import stat
 import tarfile
 import time
 import threading
 
-from urllib.error import HTTPError
+from http import HTTPStatus
+from http.client import BadStatusLine, IncompleteRead
+from urllib.error import HTTPError, URLError
 from urllib.parse import quote as urlquote, urlencode, urlparse, parse_qs, urljoin
 
 from ansible import constants as C
@@ -34,10 +37,11 @@ from ansible.utils.path import makedirs_safe
 display = Display()
 _CACHE_LOCK = threading.Lock()
 COLLECTION_PAGE_SIZE = 100
-RETRY_HTTP_ERROR_CODES = [  # TODO: Allow user-configuration
-    429,  # Too Many Requests
+RETRY_HTTP_ERROR_CODES = {  # TODO: Allow user-configuration
+    HTTPStatus.TOO_MANY_REQUESTS,
     520,  # Galaxy rate limit error code (Cloudflare unknown error)
-]
+    HTTPStatus.BAD_GATEWAY,  # Common error from galaxy that may represent any number of transient backend issues
+}
 
 
 def cache_lock(func):
@@ -48,11 +52,24 @@ def cache_lock(func):
     return wrapped
 
 
-def is_rate_limit_exception(exception):
+def should_retry_error(exception):
     # Note: cloud.redhat.com masks rate limit errors with 403 (Forbidden) error codes.
     # Since 403 could reflect the actual problem (such as an expired token), we should
     # not retry by default.
-    return isinstance(exception, GalaxyError) and exception.http_code in RETRY_HTTP_ERROR_CODES
+    if isinstance(exception, GalaxyError) and exception.http_code in RETRY_HTTP_ERROR_CODES:
+        return True
+
+    if isinstance(exception, AnsibleError) and (orig_exc := getattr(exception, 'orig_exc', None)):
+        # URLError is often a proxy for an underlying error, handle wrapped exceptions
+        if isinstance(orig_exc, URLError):
+            orig_exc = orig_exc.reason
+
+        # Handle common URL related errors such as TimeoutError, and BadStatusLine
+        # Note: socket.timeout is only required for Py3.9
+        if isinstance(orig_exc, (TimeoutError, BadStatusLine, IncompleteRead, socket.timeout)):
+            return True
+
+    return False
 
 
 def g_connect(versions):
@@ -327,7 +344,7 @@ class GalaxyAPI:
 
     @retry_with_delays_and_condition(
         backoff_iterator=generate_jittered_backoff(retries=6, delay_base=2, delay_threshold=40),
-        should_retry_error=is_rate_limit_exception
+        should_retry_error=should_retry_error
     )
     def _call_galaxy(self, url, args=None, headers=None, method=None, auth_required=False, error_context_msg=None,
                      cache=False, cache_key=None):
@@ -385,7 +402,10 @@ class GalaxyAPI:
         except HTTPError as e:
             raise GalaxyError(e, error_context_msg)
         except Exception as e:
-            raise AnsibleError("Unknown error when attempting to call Galaxy at '%s': %s" % (url, to_native(e)))
+            raise AnsibleError(
+                "Unknown error when attempting to call Galaxy at '%s': %s" % (url, to_native(e)),
+                orig_exc=e
+            )
 
         resp_data = to_text(resp.read(), errors='surrogate_or_strict')
         try:

lib/ansible/galaxy/collection/concrete_artifact_manager.py

@@ -27,9 +27,12 @@ if t.TYPE_CHECKING:
 
 from ansible.errors import AnsibleError
 from ansible.galaxy import get_collections_galaxy_meta_info
+from ansible.galaxy.api import should_retry_error
 from ansible.galaxy.dependency_resolution.dataclasses import _GALAXY_YAML
 from ansible.galaxy.user_agent import user_agent
 from ansible.module_utils._text import to_bytes, to_native, to_text
+from ansible.module_utils.api import retry_with_delays_and_condition
+from ansible.module_utils.api import generate_jittered_backoff
 from ansible.module_utils.common.process import get_bin_path
 from ansible.module_utils.common.yaml import yaml_load
 from ansible.module_utils.urls import open_url
@@ -163,6 +166,16 @@ class ConcreteArtifactsManager:
                     download_err=to_native(err),
                 ),
             ) from err
+        except Exception as err:
+            raise AnsibleError(
+                'Failed to download collection tar '
+                "from '{coll_src!s}' due to the following unforeseen error: "
+                '{download_err!s}'.
+                format(
+                    coll_src=to_native(collection.src),
+                    download_err=to_native(err),
+                ),
+            ) from err
         else:
             display.vvv(
                 "Collection '{coll!s}' obtained from "
@@ -440,6 +453,10 @@ def _extract_collection_from_git(repo_url, coll_ver, b_path):
 
 
 # FIXME: use random subdirs while preserving the file names
+@retry_with_delays_and_condition(
+    backoff_iterator=generate_jittered_backoff(retries=6, delay_base=2, delay_threshold=40),
+    should_retry_error=should_retry_error
+)
 def _download_file(url, b_path, expected_hash, validate_certs, token=None, timeout=60):
     # type: (str, bytes, t.Optional[str], bool, GalaxyToken, int) -> bytes
     # ^ NOTE: used in download and verify_collections ^
@@ -458,6 +475,7 @@ def _download_file(url, b_path, expected_hash, validate_certs, token=None, timeo
     display.display("Downloading %s to %s" % (url, to_text(b_tarball_dir)))
     # NOTE: Galaxy redirects downloads to S3 which rejects the request
     # NOTE: if an Authorization header is attached so don't redirect it
+    try:
         resp = open_url(
             to_native(url, errors='surrogate_or_strict'),
             validate_certs=validate_certs,
@@ -465,6 +483,8 @@ def _download_file(url, b_path, expected_hash, validate_certs, token=None, timeo
             unredirected_headers=['Authorization'], http_agent=user_agent(),
             timeout=timeout
         )
+    except Exception as err:
+        raise AnsibleError(to_native(err), orig_exc=err)
 
     with open(b_file_path, 'wb') as download_file:  # type: t.BinaryIO
         actual_hash = _consume_file(resp, write_to=download_file)

lib/ansible/module_utils/api.py

@@ -26,11 +26,15 @@ The 'api' module provides the following common argument specs:
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+import copy
 import functools
+import itertools
 import random
 import sys
 import time
 
+import ansible.module_utils.compat.typing as t
+
 
 def rate_limit_argument_spec(spec=None):
     """Creates an argument spec for working with rate limiting"""
@@ -141,6 +145,15 @@ def retry_with_delays_and_condition(backoff_iterator, should_retry_error=None):
     :param backoff_iterator: An iterable of delays in seconds.
     :param should_retry_error: A callable that takes an exception of the decorated function and decides whether to retry or not (returns a bool).
     """
+    def _emit_isolated_iterator_copies(original_iterator):  # type: (t.Iterable[t.Any]) -> t.Generator
+        # Ref: https://stackoverflow.com/a/30232619/595220
+        _copiable_iterator, _first_iterator_copy = itertools.tee(original_iterator)
+        yield _first_iterator_copy
+        while True:
+            yield copy.copy(_copiable_iterator)
+    backoff_iterator_generator = _emit_isolated_iterator_copies(backoff_iterator)
+    del backoff_iterator  # prevent accidental use elsewhere
+
     if should_retry_error is None:
         should_retry_error = retry_never
 
@@ -152,7 +165,7 @@ def retry_with_delays_and_condition(backoff_iterator, should_retry_error=None):
             """
             call_retryable_function = functools.partial(function, *args, **kwargs)
 
-            for delay in backoff_iterator:
+            for delay in next(backoff_iterator_generator):
                 try:
                     return call_retryable_function()
                 except Exception as e: