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#!/bin/env python
import argparse
import build.extract_ofp_fields as extract_fields
def main():
parser = argparse.ArgumentParser(
description="Tool to generate python ofproto field decoders from"
"meta-flow information"
)
parser.add_argument(
"metaflow",
metavar="FILE",
type=str,
help="Read meta-flow info from file",
)
args = parser.parse_args()
fields = extract_fields.extract_ofp_fields(args.metaflow)
field_decoders = {}
aliases = {}
for field in fields:
decoder = get_decoder(field)
field_decoders[field.get("name")] = decoder
if field.get("extra_name"):
field_decoders[field.get("extra_name")] = decoder
for nxm in field.get("OXM", []):
aliases[nxm[1]] = field.get("name")
code = """
# This file is auto-generated. Do not edit!
from ovs.flow import decoders
field_decoders = {{
{decoders}
}}
field_aliases = {{
{aliases}
}}""".format(
decoders="\n".join(
[
" '{name}': {decoder},".format(name=name, decoder=decoder)
for name, decoder in field_decoders.items()
]
),
aliases="\n".join(
[
" '{alias}': '{name}',".format(name=name, alias=alias)
for alias, name in aliases.items()
]
)
)
print(code)
def get_decoder(field):
formatting = field.get("formatting")
if formatting in ["decimal", "hexadecimal"]:
if field.get("mask") == "MFM_NONE":
return "decoders.decode_int"
else:
if field.get("n_bits") in [8, 16, 32, 64, 128, 992]:
return "decoders.Mask{}".format(field.get("n_bits"))
return "decoders.decode_mask({})".format(field.get("n_bits"))
elif formatting in ["IPv4", "IPv6"]:
return "decoders.IPMask"
elif formatting == "Ethernet":
return "decoders.EthMask"
else:
return "decoders.decode_default"
if __name__ == "__main__":
main()
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