First real-hardware test of dashcam retrieval kept crashing the whole
yaris-obd service (repeated SIGKILL/OOM on the Pi 3's ~900MB RAM) a few
minutes into every run, aborting in-flight file copies. Root cause:
_upload_dashcam_files() used requests.post(files={"file": f}), which
builds the entire multipart/form-data body in memory before sending -
fine for small payloads, but this dashcam's real clips average ~320MB
each (up to a couple hundred more with overhead), so every dashcam
upload attempt alone could push the process well past 300-600MB, and
the Pi's OOM killer stepped in immediately.
Reproduced in isolation: uploading a 300MB file the old way spiked the
client process from 28MB to 628MB RSS; switching to requests-toolbelt's
MultipartEncoder (which streams the file in chunks as the request body
is sent, instead of materializing it up front) kept it flat at ~29MB
for the same upload, with an identical byte-for-byte result on the
receiving end. No server-side changes needed - the wire format is
unchanged, still ordinary multipart/form-data.
Added requests-toolbelt to requirements.txt.
Co-authored-by: Copilot <[email protected]>
