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fix(spanner): record streaming operation completion when stream finishes #18704

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fix(spanner): record streaming operation completion when stream finishes #18704

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11 changes: 11 additions & 0 deletions packages/google-cloud-spanner/google/cloud/spanner_v1/_async/snapshot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -203,6 +203,8 @@ async def _restart_on_unavailable(
if item.resume_token:
resume_token = item.resume_token
break
else:
stream_finished = True

except ServiceUnavailable:
del item_buffer[:]
Expand Down Expand Up @@ -238,12 +240,21 @@ async def _restart_on_unavailable(
iterator = None
break

if stream_finished and metrics_tracer is not None:
try:
metrics_tracer.record_operation_completion()
except Exception:
pass
finally:
metrics_tracer = None

for item in item_buffer:
yield item

del item_buffer[:]

if stream_finished:
iterator = None
break
finally:
try:
Expand Down
10 changes: 8 additions & 2 deletions packages/google-cloud-spanner/google/cloud/spanner_v1/metrics/metrics_interceptor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -272,13 +272,16 @@ def __next__(self):
if self._iterator is None:
self._iterator = iter(self._response)
try:
return next(self._iterator)
item = next(self._iterator)
except StopIteration:
self._record_metrics()
raise
except Exception:
self._record_metrics()
raise
if getattr(item, "last", False) is True:
self._record_metrics()
Comment on lines +282 to +283

@gemini-code-assist gemini-code-assist Bot Oct 22, 2026

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medium

According to PEP 8, comparing boolean values to True or False using 'is' or '==' is discouraged. It is more idiomatic and cleaner to use the boolean value directly in the conditional statement.

Suggested change
if getattr(item, "last", False) is True:
self._record_metrics()
if getattr(item, "last", False):
self._record_metrics()
References
  1. PEP 8 advises against comparing boolean values to True or False using == or is. (link)

return item
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sinhasubham marked this conversation as resolved.

def _record_metrics(self):
with self._lock:
Expand Down Expand Up @@ -495,10 +498,13 @@ async def __anext__(self):
else:
self._iterator = self._response
try:
return await self._iterator.__anext__()
item = await self._iterator.__anext__()
except StopAsyncIteration:
await self._record_metrics()
raise
except Exception:
await self._record_metrics()
raise
if getattr(item, "last", False) is True:
await self._record_metrics()
Comment on lines +508 to +509

@gemini-code-assist gemini-code-assist Bot Oct 22, 2026

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medium

According to PEP 8, comparing boolean values to True or False using 'is' or '==' is discouraged. It is more idiomatic and cleaner to use the boolean value directly in the conditional statement.

Suggested change
if getattr(item, "last", False) is True:
await self._record_metrics()
if getattr(item, "last", False):
await self._record_metrics()
References
  1. PEP 8 advises against comparing boolean values to True or False using == or is. (link)

return item
Comment on lines +508 to +510

@gemini-code-assist gemini-code-assist Bot Oct 15, 2026

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high

Similarly to the synchronous version, the item yielded by the async iterator is a PartialResultSet protobuf message, which does not have a last field. Thus, getattr(item, "last", False) will always return False in production. We should remove this check.

        return item

10 changes: 10 additions & 0 deletions packages/google-cloud-spanner/google/cloud/spanner_v1/snapshot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,8 @@ def _restart_on_unavailable(
if item.resume_token:
resume_token = item.resume_token
break
else:
stream_finished = True
except ServiceUnavailable:
del item_buffer[:]
request.resume_token = resume_token
Expand Down Expand Up @@ -211,10 +213,18 @@ def _restart_on_unavailable(
if len(item_buffer) == 0:
iterator = None
break
if stream_finished and metrics_tracer is not None:
try:
metrics_tracer.record_operation_completion()
except Exception:
pass
finally:
metrics_tracer = None
for item in item_buffer:
yield item
del item_buffer[:]
if stream_finished:
iterator = None
break
finally:
try:
Expand Down
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