Add logical utility functions (#8590)

datadog_checks_base/datadog_checks/base/checks/openmetrics/v2/labels.py

@@ -1,7 +1,7 @@
 # (C) Datadog, Inc. 2020-present
 # All rights reserved
 # Licensed under a 3-clause BSD style license (see LICENSE)
-from ....utils.common import no_op
+from ....utils.functions import no_op
 
 
 class LabelAggregator:

datadog_checks_base/datadog_checks/base/checks/openmetrics/v2/scraper.py

@@ -15,7 +15,7 @@
 from ....config import is_affirmative
 from ....constants import ServiceCheck
 from ....errors import ConfigurationError
-from ....utils.common import no_op
+from ....utils.functions import no_op, return_true
 from ....utils.http import RequestsWrapper
 from .labels import LabelAggregator, get_label_normalizer
 from .transform import MetricTransformer
@@ -118,7 +118,7 @@ def __init__(self, check, config):
         elif exclude_metrics_by_labels:
             for label, values in exclude_metrics_by_labels.items():
                 if values is True:
-                    self.exclude_metrics_by_labels[label] = lambda label_value: True
+                    self.exclude_metrics_by_labels[label] = return_true
                 elif isinstance(values, list):
                     for i, value in enumerate(values, 1):
                         if not isinstance(value, str):

datadog_checks_base/datadog_checks/base/utils/common.py

@@ -38,10 +38,6 @@ def ensure_unicode(s):
 to_string = to_native_string
 
 
-def no_op(*args, **kwargs):
-    pass
-
-
 def compute_percent(part, total):
     if total:
         return part / total * 100

datadog_checks_base/datadog_checks/base/utils/functions.py

@@ -0,0 +1,31 @@
+# (C) Datadog, Inc. 2021-present
+# All rights reserved
+# Licensed under a 3-clause BSD style license (see LICENSE)
+
+
+def identity(obj, **kwargs):
+    """
+    https://en.wikipedia.org/wiki/Identity_function
+    """
+    return obj
+
+
+def no_op(*args, **kwargs):
+    """
+    https://en.wikipedia.org/wiki/NOP_(code)
+    """
+
+
+def predicate(assertion):
+    """
+    https://en.wikipedia.org/wiki/Predicate_(mathematical_logic)
+    """
+    return return_true if bool(assertion) else return_false
+
+
+def return_true(*args, **kwargs):
+    return True
+
+
+def return_false(*args, **kwargs):
+    return False