chore(co): handle view methods (#15268)

## Description

We extend support in Code Origin for Spans to handle view methods, in
addition to functions.

Author: P403n1x87

ddtrace/debugging/_origin/span.py

@@ -5,6 +5,7 @@
 from time import monotonic_ns
 from types import FrameType
 from types import FunctionType
+from types import MethodType
 import typing as t
 import uuid
 
@@ -210,8 +211,11 @@ class SpanCodeOriginProcessorEntry:
     _lock = Lock()
 
     @classmethod
-    def instrument_view(cls, f):
+    def instrument_view(cls, f: t.Union[FunctionType, MethodType]) -> None:
+        if isinstance(f, MethodType):
+            f = t.cast(FunctionType, f.__func__)
         if not _isinstance(f, FunctionType):
+            log.warning("Cannot instrument view %r: not a function", f)
             return
 
         with cls._lock:

ddtrace/debugging/_products/code_origin/span.py

@@ -1,5 +1,7 @@
 import enum
 from functools import partial
+from types import FunctionType
+from types import MethodType
 import typing as t
 
 import ddtrace.internal.core as core
@@ -32,7 +34,7 @@ def start():
     # We need to instrument the entrypoints on boot because this is the only
     # time the tracer will notify us of entrypoints being registered.
     @partial(core.on, "service_entrypoint.patch")
-    def _(f: t.Callable) -> None:
+    def _(f: t.Union[FunctionType, MethodType]) -> None:
         from ddtrace.debugging._origin.span import SpanCodeOriginProcessorEntry
 
         SpanCodeOriginProcessorEntry.instrument_view(f)

tests/debugging/origin/test_span.py

@@ -169,3 +169,31 @@ def entry_call():
         assert _exit.get_tag("_dd.code_origin.type") is None
         assert _exit.get_tag("_dd.code_origin.frames.0.file") is None
         assert _exit.get_tag("_dd.code_origin.frames.0.line") is None
+
+    def test_span_origin_entry_method(self):
+        class App:
+            def entry_call(self):
+                pass
+
+        app = App()
+
+        core.dispatch("service_entrypoint.patch", (app.entry_call,))
+
+        with self.tracer.trace("entry"):
+            app.entry_call()
+            with self.tracer.trace("middle"):
+                with self.tracer.trace("exit", span_type=SpanTypes.HTTP):
+                    pass
+
+        self.assert_span_count(3)
+        entry, *_ = self.get_spans()
+
+        # Check for the expected tags on the entry span
+        assert entry.get_tag("_dd.code_origin.type") == "entry"
+        assert entry.get_tag("_dd.code_origin.frames.0.file") == str(Path(__file__).resolve())
+        assert entry.get_tag("_dd.code_origin.frames.0.line") == str(App.entry_call.__code__.co_firstlineno)
+        assert entry.get_tag("_dd.code_origin.frames.0.type") == __name__
+        assert (
+            entry.get_tag("_dd.code_origin.frames.0.method")
+            == "SpanProbeTestCase.test_span_origin_entry_method.<locals>.App.entry_call"
+        )