summaryrefslogtreecommitdiffstats
path: root/lib/ansible/module_utils/api.py
diff options
context:
space:
mode:
Diffstat (limited to 'lib/ansible/module_utils/api.py')
-rw-r--r--lib/ansible/module_utils/api.py166
1 files changed, 166 insertions, 0 deletions
diff --git a/lib/ansible/module_utils/api.py b/lib/ansible/module_utils/api.py
new file mode 100644
index 0000000..e780ec6
--- /dev/null
+++ b/lib/ansible/module_utils/api.py
@@ -0,0 +1,166 @@
+# This code is part of Ansible, but is an independent component.
+# This particular file snippet, and this file snippet only, is BSD licensed.
+# Modules you write using this snippet, which is embedded dynamically by Ansible
+# still belong to the author of the module, and may assign their own license
+# to the complete work.
+#
+# Copyright: (c) 2015, Brian Coca, <bcoca@ansible.com>
+#
+# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
+"""
+This module adds shared support for generic api modules
+
+In order to use this module, include it as part of a custom
+module as shown below.
+
+The 'api' module provides the following common argument specs:
+
+ * rate limit spec
+ - rate: number of requests per time unit (int)
+ - rate_limit: time window in which the limit is applied in seconds
+
+ * retry spec
+ - retries: number of attempts
+ - retry_pause: delay between attempts in seconds
+"""
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import functools
+import random
+import sys
+import time
+
+
+def rate_limit_argument_spec(spec=None):
+ """Creates an argument spec for working with rate limiting"""
+ arg_spec = (dict(
+ rate=dict(type='int'),
+ rate_limit=dict(type='int'),
+ ))
+ if spec:
+ arg_spec.update(spec)
+ return arg_spec
+
+
+def retry_argument_spec(spec=None):
+ """Creates an argument spec for working with retrying"""
+ arg_spec = (dict(
+ retries=dict(type='int'),
+ retry_pause=dict(type='float', default=1),
+ ))
+ if spec:
+ arg_spec.update(spec)
+ return arg_spec
+
+
+def basic_auth_argument_spec(spec=None):
+ arg_spec = (dict(
+ api_username=dict(type='str'),
+ api_password=dict(type='str', no_log=True),
+ api_url=dict(type='str'),
+ validate_certs=dict(type='bool', default=True)
+ ))
+ if spec:
+ arg_spec.update(spec)
+ return arg_spec
+
+
+def rate_limit(rate=None, rate_limit=None):
+ """rate limiting decorator"""
+ minrate = None
+ if rate is not None and rate_limit is not None:
+ minrate = float(rate_limit) / float(rate)
+
+ def wrapper(f):
+ last = [0.0]
+
+ def ratelimited(*args, **kwargs):
+ if sys.version_info >= (3, 8):
+ real_time = time.process_time
+ else:
+ real_time = time.clock
+ if minrate is not None:
+ elapsed = real_time() - last[0]
+ left = minrate - elapsed
+ if left > 0:
+ time.sleep(left)
+ last[0] = real_time()
+ ret = f(*args, **kwargs)
+ return ret
+
+ return ratelimited
+ return wrapper
+
+
+def retry(retries=None, retry_pause=1):
+ """Retry decorator"""
+ def wrapper(f):
+
+ def retried(*args, **kwargs):
+ retry_count = 0
+ if retries is not None:
+ ret = None
+ while True:
+ retry_count += 1
+ if retry_count >= retries:
+ raise Exception("Retry limit exceeded: %d" % retries)
+ try:
+ ret = f(*args, **kwargs)
+ except Exception:
+ pass
+ if ret:
+ break
+ time.sleep(retry_pause)
+ return ret
+
+ return retried
+ return wrapper
+
+
+def generate_jittered_backoff(retries=10, delay_base=3, delay_threshold=60):
+ """The "Full Jitter" backoff strategy.
+
+ Ref: https://www.awsarchitectureblog.com/2015/03/backoff.html
+
+ :param retries: The number of delays to generate.
+ :param delay_base: The base time in seconds used to calculate the exponential backoff.
+ :param delay_threshold: The maximum time in seconds for any delay.
+ """
+ for retry in range(0, retries):
+ yield random.randint(0, min(delay_threshold, delay_base * 2 ** retry))
+
+
+def retry_never(exception_or_result):
+ return False
+
+
+def retry_with_delays_and_condition(backoff_iterator, should_retry_error=None):
+ """Generic retry decorator.
+
+ :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).
+ """
+ if should_retry_error is None:
+ should_retry_error = retry_never
+
+ def function_wrapper(function):
+ @functools.wraps(function)
+ def run_function(*args, **kwargs):
+ """This assumes the function has not already been called.
+ If backoff_iterator is empty, we should still run the function a single time with no delay.
+ """
+ call_retryable_function = functools.partial(function, *args, **kwargs)
+
+ for delay in backoff_iterator:
+ try:
+ return call_retryable_function()
+ except Exception as e:
+ if not should_retry_error(e):
+ raise
+ time.sleep(delay)
+
+ # Only or final attempt
+ return call_retryable_function()
+ return run_function
+ return function_wrapper