Add constants for sentry-trace and baggage headers (#1765)

* Introduced SENTRY_TRACE_HEADER_NAME variable
* Introduced +BAGGAGE_HEADER_NAME variable

.vscode/settings.json

@@ -1,4 +1,6 @@
 {
     "python.pythonPath": ".venv/bin/python",
-    "python.formatting.provider": "black"
-}
+    "python.formatting.provider": "black",
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
+}

sentry_sdk/consts.py

@@ -44,6 +44,31 @@
 DEFAULT_MAX_BREADCRUMBS = 100
 
 
+class OP:
+    DB = "db"
+    DB_REDIS = "db.redis"
+    EVENT_DJANGO = "event.django"
+    FUNCTION = "function"
+    FUNCTION_AWS = "function.aws"
+    FUNCTION_GCP = "function.gcp"
+    HTTP_CLIENT = "http.client"
+    HTTP_CLIENT_STREAM = "http.client.stream"
+    HTTP_SERVER = "http.server"
+    MIDDLEWARE_DJANGO = "middleware.django"
+    MIDDLEWARE_STARLETTE = "middleware.starlette"
+    MIDDLEWARE_STARLETTE_RECEIVE = "middleware.starlette.receive"
+    MIDDLEWARE_STARLETTE_SEND = "middleware.starlette.send"
+    QUEUE_SUBMIT_CELERY = "queue.submit.celery"
+    QUEUE_TASK_CELERY = "queue.task.celery"
+    QUEUE_TASK_RQ = "queue.task.rq"
+    SUBPROCESS = "subprocess"
+    SUBPROCESS_WAIT = "subprocess.wait"
+    SUBPROCESS_COMMUNICATE = "subprocess.communicate"
+    TEMPLATE_RENDER = "template.render"
+    VIEW_RENDER = "view.render"
+    WEBSOCKET_SERVER = "websocket.server"
+
+
 # This type exists to trick mypy and PyCharm into thinking `init` and `Client`
 # take these arguments (even though they take opaque **kwargs)
 class ClientConstructor(object):
@@ -106,28 +131,3 @@ def _get_default_options():
 
 
 VERSION = "1.11.1"
-
-
-class OP:
-    DB = "db"
-    DB_REDIS = "db.redis"
-    EVENT_DJANGO = "event.django"
-    FUNCTION = "function"
-    FUNCTION_AWS = "function.aws"
-    FUNCTION_GCP = "function.gcp"
-    HTTP_CLIENT = "http.client"
-    HTTP_CLIENT_STREAM = "http.client.stream"
-    HTTP_SERVER = "http.server"
-    MIDDLEWARE_DJANGO = "middleware.django"
-    MIDDLEWARE_STARLETTE = "middleware.starlette"
-    MIDDLEWARE_STARLETTE_RECEIVE = "middleware.starlette.receive"
-    MIDDLEWARE_STARLETTE_SEND = "middleware.starlette.send"
-    QUEUE_SUBMIT_CELERY = "queue.submit.celery"
-    QUEUE_TASK_CELERY = "queue.task.celery"
-    QUEUE_TASK_RQ = "queue.task.rq"
-    SUBPROCESS = "subprocess"
-    SUBPROCESS_WAIT = "subprocess.wait"
-    SUBPROCESS_COMMUNICATE = "subprocess.communicate"
-    TEMPLATE_RENDER = "template.render"
-    VIEW_RENDER = "view.render"
-    WEBSOCKET_SERVER = "websocket.server"

sentry_sdk/integrations/flask.py

@@ -6,7 +6,7 @@
 from sentry_sdk.integrations._wsgi_common import RequestExtractor
 from sentry_sdk.integrations.wsgi import SentryWsgiMiddleware
 from sentry_sdk.scope import Scope
-from sentry_sdk.tracing import SOURCE_FOR_STYLE
+from sentry_sdk.tracing import SENTRY_TRACE_HEADER_NAME, SOURCE_FOR_STYLE
 from sentry_sdk.utils import (
     capture_internal_exceptions,
     event_from_exception,
@@ -101,8 +101,11 @@ def _add_sentry_trace(sender, template, context, **extra):
     sentry_span = Hub.current.scope.span
     context["sentry_trace"] = (
         Markup(
-            '<meta name="sentry-trace" content="%s" />'
-            % (sentry_span.to_traceparent(),)
+            '<meta name="%s" content="%s" />'
+            % (
+                SENTRY_TRACE_HEADER_NAME,
+                sentry_span.to_traceparent(),
+            )
         )
         if sentry_span
         else ""

sentry_sdk/integrations/stdlib.py

@@ -187,7 +187,6 @@ def sentry_patched_popen_init(self, *a, **kw):
         env = None
 
         with hub.start_span(op=OP.SUBPROCESS, description=description) as span:
-
             for k, v in hub.iter_trace_propagation_headers(span):
                 if env is None:
                     env = _init_argument(

sentry_sdk/tracing.py

@@ -6,7 +6,6 @@
 from datetime import datetime, timedelta
 
 import sentry_sdk
-
 from sentry_sdk.utils import logger
 from sentry_sdk._types import MYPY
 
@@ -24,6 +23,9 @@
     import sentry_sdk.profiler
     from sentry_sdk._types import Event, SamplingContext, MeasurementUnit
 
+BAGGAGE_HEADER_NAME = "baggage"
+SENTRY_TRACE_HEADER_NAME = "sentry-trace"
+
 
 # Transaction source
 # see https://develop.sentry.dev/sdk/event-payloads/transaction/#transaction-annotations
@@ -278,10 +280,12 @@ def continue_from_headers(
 
         # TODO-neel move away from this kwargs stuff, it's confusing and opaque
         # make more explicit
-        baggage = Baggage.from_incoming_header(headers.get("baggage"))
-        kwargs.update({"baggage": baggage})
+        baggage = Baggage.from_incoming_header(headers.get(BAGGAGE_HEADER_NAME))
+        kwargs.update({BAGGAGE_HEADER_NAME: baggage})
 
-        sentrytrace_kwargs = extract_sentrytrace_data(headers.get("sentry-trace"))
+        sentrytrace_kwargs = extract_sentrytrace_data(
+            headers.get(SENTRY_TRACE_HEADER_NAME)
+        )
 
         if sentrytrace_kwargs is not None:
             kwargs.update(sentrytrace_kwargs)
@@ -308,7 +312,7 @@ def iter_headers(self):
         `sentry_tracestate` value, this will cause one to be generated and
         stored.
         """
-        yield "sentry-trace", self.to_traceparent()
+        yield SENTRY_TRACE_HEADER_NAME, self.to_traceparent()
 
         tracestate = self.to_tracestate() if has_tracestate_enabled(self) else None
         # `tracestate` will only be `None` if there's no client or no DSN
@@ -320,7 +324,7 @@ def iter_headers(self):
         if self.containing_transaction:
             baggage = self.containing_transaction.get_baggage().serialize()
             if baggage:
-                yield "baggage", baggage
+                yield BAGGAGE_HEADER_NAME, baggage
 
     @classmethod
     def from_traceparent(
@@ -344,7 +348,9 @@ def from_traceparent(
         if not traceparent:
             return None
 
-        return cls.continue_from_headers({"sentry-trace": traceparent}, **kwargs)
+        return cls.continue_from_headers(
+            {SENTRY_TRACE_HEADER_NAME: traceparent}, **kwargs
+        )
 
     def to_traceparent(self):
         # type: () -> str
@@ -653,6 +659,7 @@ def finish(self, hub=None):
             # to a concrete decision.
             if self.sampled is None:
                 logger.warning("Discarding transaction without sampling decision.")
+
             return None
 
         finished_spans = [