fix(asyncpg): instrument prepared statements

Assisted-by: Claude Sonnet 4.6

Author: aleksul

CHANGELOG.md

@@ -58,6 +58,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4049](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4049))
 - `opentelemetry-instrumentation-sqlalchemy`: implement new semantic convention opt-in migration
   ([#4110](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4110))
+- `opentelemetry-instrumentation-asyncpg`: instrument prepared statements
+  ([#4529](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4529))
 
 ### Fixed
 

instrumentation/opentelemetry-instrumentation-asyncpg/src/opentelemetry/instrumentation/asyncpg/__init__.py

@@ -53,6 +53,7 @@ async def main():
 from typing import Collection
 
 import asyncpg
+import asyncpg.prepared_stmt
 import wrapt
 
 from opentelemetry import trace
@@ -76,6 +77,14 @@ async def main():
 from opentelemetry.trace import SpanKind
 from opentelemetry.trace.status import Status, StatusCode
 
+_PREPARED_STMT_METHODS = (
+    "fetch",
+    "fetchval",
+    "fetchrow",
+    "executemany",
+    "fetchmany",
+)
+
 
 def _hydrate_span_from_args(connection, query, parameters) -> dict:
     """Get network and database attributes from connection."""
@@ -153,6 +162,14 @@ def _instrument(self, **kwargs):
                 "asyncpg.cursor", method, self._do_cursor_execute
             )
 
+        for method in _PREPARED_STMT_METHODS:
+            if hasattr(asyncpg.prepared_stmt.PreparedStatement, method):
+                wrapt.wrap_function_wrapper(
+                    "asyncpg.prepared_stmt",
+                    f"PreparedStatement.{method}",
+                    self._do_prepared_execute,
+                )
+
     def _uninstrument(self, **__):
         for cls, methods in [
             (
@@ -165,6 +182,10 @@ def _uninstrument(self, **__):
             for method_name in methods:
                 unwrap(cls, method_name)
 
+        for method_name in _PREPARED_STMT_METHODS:
+            if hasattr(asyncpg.prepared_stmt.PreparedStatement, method_name):
+                unwrap(asyncpg.prepared_stmt.PreparedStatement, method_name)
+
     async def _do_execute(self, func, instance, args, kwargs):
         exception = None
         params = getattr(instance, "_params", None)
@@ -243,3 +264,32 @@ async def _do_cursor_execute(self, func, instance, args, kwargs):
         if not stop:
             return result
         raise StopAsyncIteration
+
+    async def _do_prepared_execute(self, func, instance, args, kwargs):
+        exception = None
+        query = instance._query or ""
+
+        try:
+            name = self._leading_comment_remover.sub("", query).split()[0]
+        except IndexError:
+            name = ""
+
+        span_attributes = _hydrate_span_from_args(
+            instance._connection,
+            query,
+            args if self.capture_parameters else None,
+        )
+
+        with self._tracer.start_as_current_span(
+            name, kind=SpanKind.CLIENT, attributes=span_attributes
+        ) as span:
+            try:
+                result = await func(*args, **kwargs)
+            except Exception as exc:  # pylint: disable=W0703
+                exception = exc
+                raise
+            finally:
+                if span.is_recording() and exception is not None:
+                    span.set_status(Status(StatusCode.ERROR))
+
+        return result

instrumentation/opentelemetry-instrumentation-asyncpg/tests/test_asyncpg_wrapper.py

@@ -3,6 +3,7 @@
 
 import pytest
 from asyncpg import Connection, Record, cursor
+from asyncpg.prepared_stmt import PreparedStatement
 
 try:
     # wrapt 2.0.0+
@@ -11,7 +12,10 @@
     from wrapt import ObjectProxy as BaseObjectProxy
 
 from opentelemetry import trace as trace_api
-from opentelemetry.instrumentation.asyncpg import AsyncPGInstrumentor
+from opentelemetry.instrumentation.asyncpg import (
+    _PREPARED_STMT_METHODS,
+    AsyncPGInstrumentor,
+)
 from opentelemetry.test.test_base import TestBase
 
 
@@ -144,3 +148,121 @@ async def exec_mock(*args, **kwargs):
 
         spans = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(spans), 0)
+
+    def test_prepared_statement_instrumentation(self):
+        methods = [
+            m for m in _PREPARED_STMT_METHODS if hasattr(PreparedStatement, m)
+        ]
+
+        for method_name in methods:
+            with self.subTest(method=method_name, phase="before"):
+                self.assertFalse(
+                    isinstance(
+                        getattr(PreparedStatement, method_name),
+                        BaseObjectProxy,
+                    )
+                )
+
+        AsyncPGInstrumentor().instrument()
+
+        for method_name in methods:
+            with self.subTest(method=method_name, phase="instrumented"):
+                self.assertTrue(
+                    isinstance(
+                        getattr(PreparedStatement, method_name),
+                        BaseObjectProxy,
+                    )
+                )
+
+        AsyncPGInstrumentor().uninstrument()
+
+        for method_name in methods:
+            with self.subTest(method=method_name, phase="uninstrumented"):
+                self.assertFalse(
+                    isinstance(
+                        getattr(PreparedStatement, method_name),
+                        BaseObjectProxy,
+                    )
+                )
+
+    def _make_prepared_stmt_conn(self):
+        async def bind_execute_mock(*args, **kwargs):
+            return [], b"SELECT 1", True
+
+        async def bind_execute_many_mock(*args, **kwargs):
+            return None
+
+        conn = mock.Mock()
+        conn._pool_release_ctr = 0
+        conn.is_closed = lambda: False
+        conn._protocol = mock.Mock()
+        conn._protocol.bind_execute = bind_execute_mock
+        conn._protocol.bind_execute_many = bind_execute_many_mock
+
+        state = mock.Mock()
+        state.closed = False
+        return conn, state
+
+    def test_prepared_statement_span(self):
+        # Per-method: (query, call_args, expected_span_name)
+        method_cases = {
+            "fetch": ("SELECT * FROM users", (), "SELECT"),
+            "fetchval": ("SELECT id FROM users WHERE id=$1", (1,), "SELECT"),
+            "fetchrow": ("SELECT * FROM t WHERE v=$1", ("x",), "SELECT"),
+            "executemany": (
+                "INSERT INTO t (v) VALUES ($1)",
+                ([("a",), ("b",)],),
+                "INSERT",
+            ),
+            "fetchmany": ("SELECT * FROM t", ([],), "SELECT"),
+        }
+
+        for method_name in _PREPARED_STMT_METHODS:
+            if not hasattr(PreparedStatement, method_name):
+                continue
+            query, call_args, expected_name = method_cases[method_name]
+            with self.subTest(method=method_name):
+                self.memory_exporter.clear()
+                conn, state = self._make_prepared_stmt_conn()
+                apg = AsyncPGInstrumentor()
+                apg.instrument(tracer_provider=self.tracer_provider)
+
+                stmt = PreparedStatement(conn, query, state)
+                asyncio.run(getattr(stmt, method_name)(*call_args))
+
+                spans = self.memory_exporter.get_finished_spans()
+                self.assertEqual(len(spans), 1)
+                self.assertEqual(spans[0].name, expected_name)
+                self.assertTrue(spans[0].status.is_ok)
+                self.assertEqual(
+                    spans[0].attributes.get("db.statement"), query
+                )
+                self.assertEqual(
+                    spans[0].attributes.get("db.system"), "postgresql"
+                )
+
+                apg.uninstrument()
+
+    def test_prepared_statement_error_span(self):
+        async def bind_execute_error(*args, **kwargs):
+            raise RuntimeError("db error")
+
+        conn = mock.Mock()
+        conn._pool_release_ctr = 0
+        conn.is_closed = lambda: False
+        conn._protocol = mock.Mock()
+        conn._protocol.bind_execute = bind_execute_error
+
+        state = mock.Mock()
+        state.closed = False
+
+        apg = AsyncPGInstrumentor()
+        apg.instrument(tracer_provider=self.tracer_provider)
+
+        stmt = PreparedStatement(conn, "SELECT 1", state)
+        with self.assertRaises(RuntimeError):
+            asyncio.run(stmt.fetch())
+
+        spans = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(spans), 1)
+        self.assertFalse(spans[0].status.is_ok)