This will be useful for the next patch, which introduces per-bolt
modules. This makes it easier for them generate variables for each
field type they parse (they don't want to export u16, for example)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Instead of val_to_bin/val_from_bin which deal with bytes, we implement
read and write which use streams. This simplifies the API.
Suggested-by: Christian Decker
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This supports infrasructure for creating messages. In particular, it
can be fed CSV from the spec's `tools/extract-formats.py` and then convert
them all to and from strings and binary formats.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: pyln: new module pyln.proto.message
