WIP: Rust nodemap
A first actually working version of a nodemap implemented in Rust with an append-only variant of the same 16-radix trie as in
revlog.c, packed in the
rustext.revlog.MixedIndex class, to instantiate with the C index.
Currently activated by the presence of the
HGRUSTINDEX environment variable. It passes all the tests for me. It has the methods required for serialization by the Python layer:
- can be instantiated on anything implementing the buffer protocal for bytes (including mmap):
MixedIndex(c_idx, data, datalen)
- can return a ready to write dump all its mutable data as a bunch of bytes ready to be appended to the existing cache
- pack / vacuum logic can for the time being be done this way:
c_index = MixedIndex.get_cindex() packer = MixedIndex(c_index, None, 0) packer._fill_nodemap() with open(nodemap_fpath, 'wb') as fobj: fobj.write(packer.nodemap_writeable())
(of course that example is oversimplified, one would need
vfs, locks, perform an atomic rewrite etc, but that's not the point).
Obviously not ready for submission. Lots of squashing / resplitting and clarification of implementation, API etc, but it passes the whole test suite for me with Python 2.7