Inside the pycurl callback, we can't raise exceptions, because the
pycurl extension module will unconditionally print the exception
itself, and not pass it up to the caller. Instead, we have the
callback return a value that tells curl to abort. (-1 would be best,
in case we were given 0 bytes, but the extension doesn't support
that either).
This resolves the 'Exception("should die")' problem when interrupting
a streaming generator like stream_extract.
There's some bug with the testing harness where placing e.g.
from du import du
in nilmdb/utils/__init__.py doesn't quite work -- sometimes the
module "du" replaces the function "du". Not exactly sure why;
we work around that by just renaming files so they don't match
the imported names directly.
into a generator. Needed to get pycurl's WRITEFUNCTION to give us a
generator instead. It's a bit tricky and uses threads and queues, but
seems to work OK.
git-svn-id: https://bucket.mit.edu/svn/nilm/nilmdb@10880 ddd99763-3ecb-0310-9145-efcb8ce7c51f
