fix: centralize config

sentry_dynamic_sampling_lib/__init__.py

@@ -6,6 +6,13 @@
 
 import psutil
 
+from sentry_dynamic_sampling_lib.config import (
+    CONTROLLER_HOST,
+    CONTROLLER_PATH,
+    METRIC_INTERVAL,
+    METRIC_PATH,
+    POLL_INTERVAL,
+)
 from sentry_dynamic_sampling_lib.sampler import TraceSampler
 
 if TYPE_CHECKING:
@@ -34,13 +41,13 @@ def init_wrapper():
 
     sentry_sdk: sentry_sdk_type = importlib.import_module("sentry_sdk")
     client = sentry_sdk.Hub.current.client
-    controller_host = os.getenv("SENTRY_CONTROLLER_HOST")
-    controller_path = os.getenv("SENTRY_CONTROLLER_PATH", "/sentry/apps/{}/")
-    metric_path = os.getenv(
-        "SENTRY_CONTROLLER_METRIC_PATH", "/sentry/apps/{}/metrics/{}/"
-    )
-    poll_interval = int(os.getenv("SENTRY_CONTROLLER_POLL_INTERVAL", "30"))
-    metric_interval = int(os.getenv("SENTRY_CONTROLLER_METRIC_INTERVAL", "300"))
+
+    controller_host = CONTROLLER_HOST
+    controller_path = CONTROLLER_PATH
+    metric_path = METRIC_PATH
+    poll_interval = POLL_INTERVAL
+    metric_interval = METRIC_INTERVAL
+
     if controller_host:
         app_key = build_app_key(client.options)
         controller_endpoint = urljoin(controller_host, controller_path)

sentry_dynamic_sampling_lib/config.py

@@ -0,0 +1,13 @@
+import os
+
+# default value overridden by controller
+DEFAULT_IGNORED_PATH = {"/health", "/healthz", "/health/", "/healthz/"}
+DEFAULT_IGNORED_TASK = set()
+DEFAULT_SAMPLE_RATE = 0.0
+
+# controller variables
+CONTROLLER_HOST = os.getenv("SENTRY_CONTROLLER_HOST")
+CONTROLLER_PATH = os.getenv("SENTRY_CONTROLLER_PATH", "/sentry/apps/{}/")
+METRIC_PATH = os.getenv("SENTRY_CONTROLLER_METRIC_PATH", "/sentry/apps/{}/metrics/{}/")
+POLL_INTERVAL = int(os.getenv("SENTRY_CONTROLLER_POLL_INTERVAL", "60"))
+METRIC_INTERVAL = int(os.getenv("SENTRY_CONTROLLER_METRIC_INTERVAL", "600"))

sentry_dynamic_sampling_lib/shared.py

@@ -2,21 +2,20 @@
 from enum import Enum
 from threading import RLock
 
+from sentry_dynamic_sampling_lib.config import (
+    DEFAULT_IGNORED_PATH,
+    DEFAULT_IGNORED_TASK,
+    DEFAULT_SAMPLE_RATE,
+)
 from sentry_dynamic_sampling_lib.utils import synchronized
 
 
 class Config:
     def __init__(self) -> None:
         self._lock = RLock()
-        self._sample_rate = 0.0
-        self._ignored_paths = {
-            "/health",
-            "/healthz",
-            "/health/",
-            "/healthz/",
-        }
-
-        self._ignored_tasks = set()
+        self._sample_rate = DEFAULT_SAMPLE_RATE
+        self._ignored_paths = DEFAULT_IGNORED_PATH
+        self._ignored_tasks = DEFAULT_IGNORED_TASK
 
     @property
     @synchronized