elastic / elastic/apm-agent-python

capture_exception raise TransportException and abort transaction

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Description

**Describe the bug**: ...

During an exception handling capture_exeption fail to send data and as result transaction is aborted.
Seems the problem is decoding the data payload (memoryview type) to urllib3

This snippet replicate the issue in my env, just need to setup elasticapm client:

from shapely.geometry import Polygon
import geopandas as gpd
import elasticapm
import traceback

client = elasticapm.Client()
client.begin_transaction(transaction_type="script")
result = 'unknown'
try:
with elasticapm.capture_span(name="a_name", labels={}):
a = Polygon()
b = gpd.GeoDataFrame(geometry=[a])
b.centroid.x[0]
result = 'success'
except Exception:
message = traceback.format_exc()
client.capture_exception()
result = 'failed'
finally:
client.end_transaction(name="transaction_name", result=result)

result in the following trace:

```
2021-12-22 12:22:56,737 [urllib3.connectionpool] [DEBUG] https://:443 "POST /intake/v2/events HTTP/1.1" 400 None
2021-12-22 12:22:56,828 [elasticapm.transport] [ERROR] Failed to submit message: 'HTTP 400: {"accepted":24,"errors":[{"message":"decode error: data read error: v2.errorRoot.Error: v2.errorEvent.Exception: v2.errorException.Stacktrace: []v2.stacktraceFrame: v2.stacktraceFrame.Vars: Read: unexpected value type: 0, error found in #10 byte of ...|l_value\\": NaN}, \\"pre|..., bigger context ...|,\\\\n dtype=object)\\", \\"op\\": \\"x\\", \\"null_value\\": NaN}, \\"pre_context\\": [\\" # type: (str, np.array[|...","document":"{\\"error\\": {\\"context\\": {\\"custom\\": {}}, \\"id\\": \\".....\\", \\"exception\\": {\\"message\\": \\"IndexError: list index out of range\\", \\"type\\": \\"IndexError\\", \\"module\\": \\"builtins\\", \\"stacktrace\\": [{\\"abs_path\\": \\"./stripe_delivery_pipeline.py\\", \\"filename\\": \\"stripe_delivery_pipeline.py\\", \\"module\\": \\"__main__\\", \\"function\\": \\"main\\", \\"lineno\\": 1970, \\"library_frame\\": false, \\"vars\\": {\\"elasticapm_span_labels\\": null, \\"elasticapm_span_name\\": \\"delivery-pipeline-main\\", \\"location\\": \\"undefined\\", \\"country\\": \\"undefined\\", \\"message\\": \\"Traceback (most recent call last):\\\\n File \\\\\\"./stripe_delivery_pipeline.py\\\\\\", line 1970, in main\\\\n status, message, country, location = real_main_multi_AOI(scene_set_id, scene_id_tag)\\\\n File \\\\\\"./stri...\\", \\"status\\": \\"Failed\\", \\"result\\": null, \\"labels\\": {\\"pod_name\\": null, \\"job_id\\": null, \\"sceneset_id\\": \\".........\\", \\"scene_id_tag\\": null}, \\" ...[cut]
```

and

```
Traceback (most recent call last):
File "/home/lpirelli/miniconda/envs/py36/lib/python3.6/site-packages/elasticapm/transport/base.py", line 239, in _flush
self.send(data)
File "/home/lpirelli/miniconda/envs/py36/lib/python3.6/site-packages/elasticapm/transport/http.py", line 113, in send
raise TransportException(message, data, print_trace=print_trace)
elasticapm.transport.exceptions.TransportException: HTTP 400: {"accepted":24,"errors":[{"message":"decode error: data read error: v2.errorRoot.Error: v2.errorEvent.Exception: v2.errorException.Stacktrace: []v2.stacktraceFrame: v2.stacktraceFrame.Vars: Read: unexpected value type: 0, error found in #10 byte of ...|l_value\": NaN}, \"pre|..., bigger context ...|,\\n dtype=object)\", \"op\": \"x\", \"null_value\": NaN}, \"pre_context\": [\" # type: (str, np.array[|...","document":"{\"error\": {\"context\": {\"custom\": {}}, \"id\": \"....\", \"exception\": {\"message\": \"IndexError: list index out of range\", \"type\": \"IndexError\", \"module\": \"builtins\", \"stacktra ....[cut]
```

data payload in memory view is:

```
a= b'\x1f\x8b\x08\x00a\x11\xc3a\x02\xff\xed}{w#\xb7\xb1\xe7\xff\xfb)xx\xb3\xeb\xf1\x1e\x91\xc2\xb3\x1f:q\xb2\xb2F\xb6\x95;\x0fE\x92\x938\xe39}\xd0\xddh\xa93$\x9b\xe9&53\xf1z?\xfbV\x01\xfd\xe4C\xa44\x92F\xf6pr\xaf%u\x03\xe8z\xa1\xf0.... [cut]'

str(a, 'utf8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte
```
**Environment (please complete the following information)**
- OS: Linux
- Python version:Python 3.6.10 |Anaconda, Inc.| (default, Mar 23 2020, 23:13:11) [GCC 7.3.0] on linux
- APM Server version: elasticsearch==7.10.1, elastic-apm==6.4.0

Guide de contribution

Ouvrir le guide de contribution

Piste de recherche

Reproduisez l’exemple capture_exception fourni, puis examinez _flush dans elasticapm/transport/base.py et send dans elasticapm/transport/http.py, en vous concentrant sur le payload memoryview et l’échec de décodage signalé. Le travail est terminé lorsque le payload de l’exception est accepté sans que TransportException ne s’échappe et que la transaction puisse se terminer normalement.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Évaluation

Stack technique
python
Domaine
backend, observability-sre
Type d'issue
Bug
Difficulté
4/5
Temps estimé
3-5 jours
Activité
À l'abandon
Clarté
Plutôt claire
Accessibilité débutants
35/100

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