async def parse_extra_fields(extra_buff):
"""
Parses extra buffer to the extra fields vector
:param extra_buff:
:return:
"""
extras = []
rw = MemoryReaderWriter(bytes(extra_buff))
ar2 = xmrserialize.Archive(rw, False)
while len(rw.get_buffer()) > 0:
extras.append(await ar2.variant(elem_type=TxExtraField))
return extras
async def add_additional_tx_pub_keys_to_extra(tx_extra,
additional_pub_keys=None,
pub_enc=None):
"""
Adds all pubkeys to the extra
:param tx_extra:
:param additional_pub_keys:
:param pub_enc: None
:return:
"""
pubs_msg = TxExtraAdditionalPubKeys(
data=pub_enc
if pub_enc else [crypto.encodepoint(x) for x in additional_pub_keys])
rw = MemoryReaderWriter()
ar = xmrserialize.Archive(rw, True)
# format: variant_tag (0x4) | array len varint | 32B | 32B | ...
await ar.variant(pubs_msg, TxExtraField)
tx_extra += bytes(rw.get_buffer())
return tx_extra
async def remove_field_from_tx_extra(extra, mtype):
"""
Removes extra field of fiven type from the buffer
Reserializes with skipping the given mtype.
:param extra:
:param mtype:
:return:
"""
if len(extra) == 0:
return []
reader = MemoryReaderWriter(extra)
writer = MemoryReaderWriter()
ar_read = xmrserialize.Archive(reader, False)
ar_write = xmrserialize.Archive(writer, True)
while len(reader.get_buffer()) > 0:
c_extras = await ar_read.variant(elem_type=TxExtraField)
if not isinstance(c_extras, mtype):
await ar_write.variant(c_extras, elem_type=TxExtraField)
return writer.get_buffer()