Reduce edit surface for better precision

Author: odeke-em

google/cloud/spanner_v1/pool.py

@@ -206,51 +206,49 @@ def bind(self, database):
             )
         self._database_role = self._database_role or self._database.database_role
 
-        with trace_call("CloudSpanner.BatchCreateSessions", self) as span:
-            requested_session_count = self.size - self._sessions.qsize()
-            span_event_attributes = {"kind": type(self).__name__}
-            request = BatchCreateSessionsRequest(
-                database=database.name,
-                session_count=requested_session_count,
-                session_template=Session(creator_role=self.database_role),
-            )
-
-            if requested_session_count > 0:
-                add_span_event(
-                    span,
-                    f"Requesting {requested_session_count} sessions",
-                    span_event_attributes,
-                )
+        requested_session_count = self.size - self._sessions.qsize()
+        request = BatchCreateSessionsRequest(
+            database=database.name,
+            session_count=requested_session_count,
+            session_template=Session(creator_role=self.database_role),
+        )
 
-            if self._sessions.full():
-                add_span_event(
-                    span, "Session pool is already full", span_event_attributes
-                )
-                return
+        span = get_current_span()
+        span_event_attributes = {"kind": type(self).__name__}
+        if requested_session_count > 0:
+            add_span_event(
+                span,
+                f"Requesting {requested_session_count} sessions",
+                span_event_attributes,
+            )
 
-            returned_session_count = 0
-            while not self._sessions.full():
-                request.session_count = requested_session_count - self._sessions.qsize()
-                add_span_event(
-                    span,
-                    f"Creating {request.session_count} sessions",
-                    span_event_attributes,
-                )
-                resp = api.batch_create_sessions(
-                    request=request,
-                    metadata=metadata,
-                )
-                for session_pb in resp.session:
-                    session = self._new_session()
-                    session._session_id = session_pb.name.split("/")[-1]
-                    self._sessions.put(session)
-                    returned_session_count += 1
+        if self._sessions.full():
+            add_span_event(span, "Session pool is already full", span_event_attributes)
+            return
 
+        returned_session_count = 0
+        while not self._sessions.full():
+            request.session_count = requested_session_count - self._sessions.qsize()
             add_span_event(
                 span,
-                f"Requested for {requested_session_count} sessions, returned {returned_session_count}",
+                f"Creating {request.session_count} sessions",
                 span_event_attributes,
             )
+            resp = api.batch_create_sessions(
+                request=request,
+                metadata=metadata,
+            )
+            for session_pb in resp.session:
+                session = self._new_session()
+                session._session_id = session_pb.name.split("/")[-1]
+                self._sessions.put(session)
+                returned_session_count += 1
+
+        add_span_event(
+            span,
+            f"Requested for {requested_session_count} sessions, returned {returned_session_count}",
+            span_event_attributes,
+        )
 
     def get(self, timeout=None):
         """Check a session out from the pool.

google/cloud/spanner_v1/transaction.py

@@ -243,8 +243,9 @@ def commit(
         :raises ValueError: if there are no mutations to commit.
         """
         self._check_state()
-        not_began = self._transaction_id is None and len(self._mutations) == 0
-        if not_began:
+        if self._transaction_id is None and len(self._mutations) > 0:
+            self.begin()
+        elif self._transaction_id is None and len(self._mutations) == 0:
             raise ValueError("Transaction is not begun")
 
         database = self._session._database

tests/unit/test_pool.py

@@ -229,27 +229,29 @@ def test_spans_bind_get(self):
             ]
             self.assertSpanEvents("pool.Get", wantEventNames, span)
 
-        # Check for the overall spans.
+        # Check for the overall spans too.
         self.assertSpanAttributes(
-            "CloudSpanner.BatchCreateSessions",
+            "pool.Get",
             attributes=TestFixedSizePool.BASE_ATTRIBUTES,
         )
 
         wantEventNames = [
-            "Requesting 4 sessions",
-            "Creating 4 sessions",
-            "Creating 2 sessions",
-            "Requested for 4 sessions, returned 4",
+            "Acquiring session",
+            "Waiting for a session to become available",
+            "Acquired session",
         ]
-        self.assertSpanEvents("CloudSpanner.BatchCreateSessions", wantEventNames)
+        self.assertSpanEvents("pool.Get", wantEventNames)
 
-    def test_spans_get_create_sessions(self):
+    def test_spans_pool_bind(self):
         pool = self._make_one(size=1)
         database = _Database("name")
         SESSIONS = []
         database._sessions.extend(SESSIONS)
+        fauxSession = mock.Mock()
+        setattr(fauxSession, "_database", database)
         try:
-            pool.bind(database)
+            with trace_call("testBind", fauxSession):
+                pool.bind(database)
         except Exception:
             pass
 
@@ -259,11 +261,11 @@ def test_spans_get_create_sessions(self):
             "exception",
             "exception",
         ]
-        self.assertSpanEvents("CloudSpanner.BatchCreateSessions", wantEventNames)
+        self.assertSpanEvents("testBind", wantEventNames)
 
         # Check for the overall spans.
         self.assertSpanAttributes(
-            "CloudSpanner.BatchCreateSessions",
+            "testBind",
             status=StatusCode.ERROR,
             attributes=TestFixedSizePool.BASE_ATTRIBUTES,
         )