Refactor samplers to use SamplerProxy

newrelic/api/application.py

@@ -156,11 +156,11 @@ def normalize_name(self, name, rule_type="url"):
             return self._agent.normalize_name(self._name, name, rule_type)
         return name, False
 
-    def compute_sampled(self):
+    def compute_sampled(self, full_granularity, section, *args, **kwargs):
         if not self.active or not self.settings.distributed_tracing.enabled:
             return False
 
-        return self._agent.compute_sampled(self._name)
+        return self._agent.compute_sampled(self._name, full_granularity, section, *args, **kwargs)
 
 
 def application_instance(name=None, activate=True):

newrelic/api/transaction.py

@@ -1006,7 +1006,7 @@ def _update_agent_attributes(self):
     def user_attributes(self):
         return create_attributes(self._custom_params, DST_ALL, self.attribute_filter)
 
-    def sampling_algo_compute_sampled_and_priority(self, priority, sampled):
+    def sampling_algo_compute_sampled_and_priority(self, priority, sampled, sampler_kwargs):
         # self._priority and self._sampled are set when parsing the W3C tracestate
         # or newrelic DT headers and may be overridden in _make_sampling_decision
         # based on the configuration. The only time they are set in here is when the
@@ -1016,25 +1016,21 @@ def sampling_algo_compute_sampled_and_priority(self, priority, sampled):
             priority = float(f"{random.random():.6f}")  # noqa: S311
         if sampled is None:
             _logger.debug("No trusted account id found. Sampling decision will be made by adaptive sampling algorithm.")
-            sampled = self._application.compute_sampled()
+            sampled = self._application.compute_sampled(**sampler_kwargs)
             if sampled:
                 priority += 1
         return priority, sampled
 
     def _compute_sampled_and_priority(
-        self,
-        priority,
-        sampled,
-        remote_parent_sampled_path,
-        remote_parent_sampled_setting,
-        remote_parent_not_sampled_path,
-        remote_parent_not_sampled_setting,
+        self, priority, sampled, full_granularity, remote_parent_sampled_setting, remote_parent_not_sampled_setting
     ):
         if self._remote_parent_sampled is None:
+            section = 0
             config = "default"  # Use sampling algo.
             _logger.debug("Sampling decision made based on no remote parent sampling decision present.")
         elif self._remote_parent_sampled:
-            setting_path = remote_parent_sampled_path
+            section = 1
+            setting_path = f"distributed_tracing.sampler.{'full_granularity' if full_granularity else 'partial_granularity'}.remote_parent_sampled"
             config = remote_parent_sampled_setting
             _logger.debug(
                 "Sampling decision made based on remote_parent_sampled=%s and %s=%s.",
@@ -1043,7 +1039,8 @@ def _compute_sampled_and_priority(
                 config,
             )
         else:  # self._remote_parent_sampled is False.
-            setting_path = remote_parent_not_sampled_path
+            section = 2
+            setting_path = f"distributed_tracing.sampler.{'full_granularity' if full_granularity else 'partial_granularity'}.remote_parent_not_sampled"
             config = remote_parent_not_sampled_setting
             _logger.debug(
                 "Sampling decision made based on remote_parent_sampled=%s and %s=%s.",
@@ -1064,7 +1061,9 @@ def _compute_sampled_and_priority(
             _logger.debug(
                 "Let adaptive sampler algorithm decide based on sampled=%s and priority=%s.", sampled, priority
             )
-            priority, sampled = self.sampling_algo_compute_sampled_and_priority(priority, sampled)
+            priority, sampled = self.sampling_algo_compute_sampled_and_priority(
+                priority, sampled, {"full_granularity": full_granularity, "section": section}
+            )
         return priority, sampled
 
     def _make_sampling_decision(self):
@@ -1084,9 +1083,8 @@ def _make_sampling_decision(self):
             computed_priority, computed_sampled = self._compute_sampled_and_priority(
                 priority,
                 sampled,
-                remote_parent_sampled_path="distributed_tracing.sampler.full_granularity.remote_parent_sampled",
+                full_granularity=True,
                 remote_parent_sampled_setting=self.settings.distributed_tracing.sampler.full_granularity.remote_parent_sampled,
-                remote_parent_not_sampled_path="distributed_tracing.sampler.full_granularity.remote_parent_not_sampled",
                 remote_parent_not_sampled_setting=self.settings.distributed_tracing.sampler.full_granularity.remote_parent_not_sampled,
             )
             _logger.debug("Full granularity sampling decision was %s with priority=%s.", sampled, priority)
@@ -1102,9 +1100,8 @@ def _make_sampling_decision(self):
             self._priority, self._sampled = self._compute_sampled_and_priority(
                 priority,
                 sampled,
-                remote_parent_sampled_path="distributed_tracing.sampler.partial_granularity.remote_parent_sampled",
+                full_granularity=False,
                 remote_parent_sampled_setting=self.settings.distributed_tracing.sampler.partial_granularity.remote_parent_sampled,
-                remote_parent_not_sampled_path="distributed_tracing.sampler.partial_granularity.remote_parent_not_sampled",
                 remote_parent_not_sampled_setting=self.settings.distributed_tracing.sampler.partial_granularity.remote_parent_not_sampled,
             )
             _logger.debug(

newrelic/core/agent.py

@@ -581,9 +581,9 @@ def normalize_name(self, app_name, name, rule_type="url"):
 
         return application.normalize_name(name, rule_type)
 
-    def compute_sampled(self, app_name):
+    def compute_sampled(self, app_name, full_granularity, section, *args, **kwargs):
         application = self._applications.get(app_name, None)
-        return application.compute_sampled()
+        return application.compute_sampled(full_granularity, section, *args, **kwargs)
 
     def _harvest_shutdown_is_set(self):
         try:

newrelic/core/application.py

@@ -23,7 +23,6 @@
 from functools import partial
 
 from newrelic.common.object_names import callable_name
-from newrelic.core.adaptive_sampler import AdaptiveSampler
 from newrelic.core.agent_control_health import (
     HealthStatus,
     agent_control_health_instance,
@@ -37,6 +36,7 @@
 from newrelic.core.internal_metrics import InternalTrace, InternalTraceContext, internal_count_metric, internal_metric
 from newrelic.core.profile_sessions import profile_session_manager
 from newrelic.core.rules_engine import RulesEngine, SegmentCollapseEngine
+from newrelic.core.samplers.sampler_proxy import SamplerProxy
 from newrelic.core.stats_engine import CustomMetrics, StatsEngine
 from newrelic.network.exceptions import (
     DiscardDataForRequest,
@@ -78,7 +78,7 @@ def __init__(self, app_name, linked_applications=None):
         self._transaction_count = 0
         self._last_transaction = 0.0
 
-        self.adaptive_sampler = None
+        self.sampler = None
 
         self._global_events_account = 0
 
@@ -156,11 +156,11 @@ def configuration(self):
     def active(self):
         return self.configuration is not None
 
-    def compute_sampled(self):
-        if self.adaptive_sampler is None:
+    def compute_sampled(self, full_granularity, section, *args, **kwargs):
+        if self.sampler is None:
             return False
 
-        return self.adaptive_sampler.compute_sampled()
+        return self.sampler.compute_sampled(full_granularity, section, *args, **kwargs)
 
     def dump(self, file):
         """Dumps details about the application to the file object."""
@@ -501,12 +501,7 @@ def connect_to_data_collector(self, activate_agent):
 
         with self._stats_lock:
             self._stats_engine.reset_stats(configuration, reset_stream=True)
-
-            if configuration.serverless_mode.enabled:
-                sampling_target_period = 60.0
-            else:
-                sampling_target_period = configuration.sampling_target_period_in_seconds
-            self.adaptive_sampler = AdaptiveSampler(configuration.sampling_target, sampling_target_period)
+            self.sampler = SamplerProxy(configuration)
 
         active_session.connect_span_stream(self._stats_engine.span_stream, self.record_custom_metric)
 

newrelic/core/samplers/__init__.py

@@ -0,0 +1,14 @@
+# Copyright 2010 New Relic, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+

newrelic/core/samplers/sampler_proxy.py

@@ -0,0 +1,34 @@
+# Copyright 2010 New Relic, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from newrelic.core.samplers.adaptive_sampler import AdaptiveSampler
+
+
+class SamplerProxy:
+    def __init__(self, settings):
+        if settings.serverless_mode.enabled:
+            sampling_target_period = 60.0
+        else:
+            sampling_target_period = settings.sampling_target_period_in_seconds
+        adaptive_sampler = AdaptiveSampler(settings.sampling_target, sampling_target_period)
+        self._samplers = [adaptive_sampler]
+
+    def get_sampler(self, full_granularity, section):
+        return self._samplers[0]
+
+    def compute_sampled(self, full_granularity, section, *args, **kwargs):
+        """
+        full_granularity: True is full granularity, False is partial granularity
+        section: 0-root, 1-remote_parent_sampled, 2-remote_parent_not_sampled
+        """
+        return self.get_sampler(full_granularity, section).compute_sampled(*args, **kwargs)

tests/agent_features/test_distributed_tracing.py

@@ -593,11 +593,11 @@ def test_distributed_trace_remote_parent_sampling_decision_full_granularity(
     )
     if expected_adaptive_sampling_algo_called:
         function_called_decorator = validate_function_called(
-            "newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled"
+            "newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled"
         )
     else:
         function_called_decorator = validate_function_not_called(
-            "newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled"
+            "newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled"
         )
 
     @function_called_decorator
@@ -684,11 +684,11 @@ def test_distributed_trace_remote_parent_sampling_decision_partial_granularity(
     )
     if expected_adaptive_sampling_algo_called:
         function_called_decorator = validate_function_called(
-            "newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled"
+            "newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled"
         )
     else:
         function_called_decorator = validate_function_not_called(
-            "newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled"
+            "newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled"
         )
 
     @function_called_decorator
@@ -752,11 +752,11 @@ def test_distributed_trace_remote_parent_sampling_decision_between_full_and_part
     )
     if expected_adaptive_sampling_algo_called:
         function_called_decorator = validate_function_called(
-            "newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled"
+            "newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled"
         )
     else:
         function_called_decorator = validate_function_not_called(
-            "newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled"
+            "newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled"
         )
 
     @function_called_decorator

tests/agent_unittests/test_harvest_loop.py

@@ -542,30 +542,30 @@ def test_adaptive_sampling(transaction_node, monkeypatch):
     app = Application("Python Agent Test (Harvest Loop)")
 
     # Should always return false for sampling prior to connect
-    assert app.compute_sampled() is False
+    assert app.compute_sampled(True, 0) is False
 
     app.connect_to_data_collector(None)
 
     # First harvest, first N should be sampled
     for _ in range(settings.sampling_target):
-        assert app.compute_sampled() is True
+        assert app.compute_sampled(True, 0) is True
 
-    assert app.compute_sampled() is False
+    assert app.compute_sampled(True, 0) is False
 
     # fix random.randrange to return 0
     monkeypatch.setattr(random, "randrange", lambda *args, **kwargs: 0)
 
     # Multiple resets should behave the same
     for _ in range(2):
         # Set the last_reset to longer than the period so a reset will occur.
-        app.adaptive_sampler.last_reset = time.time() - app.adaptive_sampler.period
+        app.sampler.get_sampler(True, 0).last_reset = time.time() - app.sampler.get_sampler(True, 0).period
 
         # Subsequent harvests should allow sampling of 2X the target
         for _ in range(2 * settings.sampling_target):
-            assert app.compute_sampled() is True
+            assert app.compute_sampled(True, 0) is True
 
         # No further samples should be saved
-        assert app.compute_sampled() is False
+        assert app.compute_sampled(True, 0) is False
 
 
 @override_generic_settings(
@@ -709,20 +709,20 @@ def test_serverless_mode_adaptive_sampling(time_to_next_reset, computed_count, c
     app = Application("Python Agent Test (Harvest Loop)")
 
     app.connect_to_data_collector(None)
-    app.adaptive_sampler.computed_count = 123
-    app.adaptive_sampler.last_reset = time.time() - 60 + time_to_next_reset
+    app.sampler.get_sampler(True, 0).computed_count = 123
+    app.sampler.get_sampler(True, 0).last_reset = time.time() - 60 + time_to_next_reset
 
-    assert app.compute_sampled() is True
-    assert app.adaptive_sampler.computed_count == computed_count
-    assert app.adaptive_sampler.computed_count_last == computed_count_last
+    assert app.compute_sampled(True, 0) is True
+    assert app.sampler.get_sampler(True, 0).computed_count == computed_count
+    assert app.sampler.get_sampler(True, 0).computed_count_last == computed_count_last
 
 
-@validate_function_not_called("newrelic.core.adaptive_sampler", "AdaptiveSampler._reset")
+@validate_function_not_called("newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler._reset")
 @override_generic_settings(settings, {"developer_mode": True})
 def test_compute_sampled_no_reset():
     app = Application("Python Agent Test (Harvest Loop)")
     app.connect_to_data_collector(None)
-    assert app.compute_sampled() is True
+    assert app.compute_sampled(True, 0) is True
 
 
 def test_analytic_event_sampling_info():

tests/cross_agent/test_distributed_tracing.py

@@ -65,7 +65,7 @@ def load_tests():
 
 
 def override_compute_sampled(override):
-    @transient_function_wrapper("newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled")
+    @transient_function_wrapper("newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled")
     def _override_compute_sampled(wrapped, instance, args, kwargs):
         if override:
             return True

tests/cross_agent/test_w3c_trace_context.py

@@ -161,7 +161,7 @@ def target_wsgi_application(environ, start_response):
 
 
 def override_compute_sampled(override):
-    @transient_function_wrapper("newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled")
+    @transient_function_wrapper("newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled")
     def _override_compute_sampled(wrapped, instance, args, kwargs):
         if override:
             return True

tests/testing_support/fixtures.py

@@ -1048,7 +1048,7 @@ def _bind_params(application, *args, **kwargs):
 
 @function_wrapper
 def dt_enabled(wrapped, instance, args, kwargs):
-    @transient_function_wrapper("newrelic.core.adaptive_sampler", "AdaptiveSampler.compute_sampled")
+    @transient_function_wrapper("newrelic.core.samplers.adaptive_sampler", "AdaptiveSampler.compute_sampled")
     def force_sampled(wrapped, instance, args, kwargs):
         wrapped(*args, **kwargs)
         return True