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#!/usr/bin/env python3
import json
def msg_is_reply(name):
return name.endswith('_reply') or name.endswith('_details') \
or name.endswith('_event') or name.endswith('_counters')
class ParseError (Exception):
pass
magic_prefix = "vl_api_"
magic_suffix = "_t"
def remove_magic(what):
if what.startswith(magic_prefix) and what.endswith(magic_suffix):
return what[len(magic_prefix): - len(magic_suffix)]
return what
class Field:
def __init__(
self,
field_name,
field_type,
array_len=None,
nelem_field=None):
self.name = field_name
self.type = field_type
self.len = array_len
self.nelem_field = nelem_field
def __str__(self):
if self.len is None:
return "name: %s, type: %s" % (self.name, self.type)
elif self.len > 0:
return "name: %s, type: %s, length: %s" % (self.name, self.type,
self.len)
else:
return ("name: %s, type: %s, variable length stored in: %s" %
(self.name, self.type, self.nelem_field))
class Type:
def __init__(self, name):
self.name = name
class SimpleType (Type):
def __init__(self, name):
super().__init__(name)
def __str__(self):
return self.name
def get_msg_header_defs(struct_type_class, field_class, typedict):
return [
struct_type_class(['msg_header1_t',
['u16', '_vl_msg_id'],
['u32', 'context'],
],
typedict, field_class
),
struct_type_class(['msg_header2_t',
['u16', '_vl_msg_id'],
['u32', 'client_index'],
['u32', 'context'],
],
typedict, field_class
),
]
class Struct:
def __init__(self, name, fields):
self.name = name
self.fields = fields
self.field_names = [n.name for n in self.fields]
class Message:
def __init__(self, logger, definition, typedict,
struct_type_class, simple_type_class, field_class):
self.logger = logger
m = definition
logger.debug("Parsing message definition `%s'" % m)
name = m[0]
self.name = name
logger.debug("Message name is `%s'" % name)
ignore = True
self.header = None
fields = []
for header in get_msg_header_defs(struct_type_class, field_class,
typedict):
logger.debug("Probing header `%s'" % header.name)
if header.is_part_of_def(m[1:]):
self.header = header
logger.debug("Found header `%s'" % header.name)
fields.append(field_class(field_name='header',
field_type=self.header))
ignore = False
break
if ignore and not msg_is_reply(name):
raise ParseError("While parsing message `%s': could not find all "
"common header fields" % name)
for field in m[1:]:
if len(field) == 1 and 'crc' in field:
self.crc = field['crc']
logger.debug("Found CRC `%s'" % self.crc)
continue
else:
field_type = field[0]
if field_type in typedict:
field_type = typedict[field_type]
else:
field_type = typedict[remove_magic(field_type)]
if len(field) == 2:
if self.header is not None and\
self.header.has_field(field[1]):
continue
p = field_class(field_name=field[1],
field_type=field_type)
elif len(field) == 3:
if field[2] == 0:
raise ParseError(
"While parsing message `%s': variable length "
"array `%s' doesn't have reference to member "
"containing the actual length" % (
name, field[1]))
p = field_class(
field_name=field[1],
field_type=field_type,
array_len=field[2])
elif len(field) == 4:
nelem_field = None
for f in fields:
if f.name == field[3]:
nelem_field = f
if nelem_field is None:
raise ParseError(
"While parsing message `%s': couldn't find "
"variable length array `%s' member containing "
"the actual length `%s'" % (
name, field[1], field[3]))
p = field_class(
field_name=field[1],
field_type=field_type,
array_len=field[2],
nelem_field=nelem_field)
else:
raise Exception("Don't know how to parse message "
"definition for message `%s': `%s'" %
(m, m[1:]))
logger.debug("Parsed field `%s'" % p)
fields.append(p)
self.fields = fields
def is_dump(self):
return self.name.endswith('_dump')
def is_reply(self):
return msg_is_reply(self.name)
class StructType (Type, Struct):
def __init__(self, definition, typedict, field_class):
t = definition
name = t[0]
fields = []
for field in t[1:]:
if len(field) == 1 and 'crc' in field:
self.crc = field['crc']
continue
elif len(field) == 2:
p = field_class(field_name=field[1],
field_type=typedict[field[0]])
elif len(field) == 3:
if field[2] == 0:
raise ParseError("While parsing type `%s': array `%s' has "
"variable length" % (name, field[1]))
p = field_class(field_name=field[1],
field_type=typedict[field[0]],
array_len=field[2])
else:
raise ParseError(
"Don't know how to parse type definition for "
"type `%s': `%s'" % (t, t[1:]))
fields.append(p)
Type.__init__(self, name)
Struct.__init__(self, name, fields)
def has_field(self, name):
return name in self.field_names
def is_part_of_def(self, definition):
for idx in range(len(self.fields)):
field = definition[idx]
p = self.fields[idx]
if field[1] != p.name:
return False
if field[0] != p.type.name:
raise ParseError(
"Unexpected field type `%s' (should be `%s'), "
"while parsing msg/def/field `%s/%s/%s'" %
(field[0], p.type, p.name, definition, field))
return True
class JsonParser:
def __init__(self, logger, files, simple_type_class=SimpleType,
struct_type_class=StructType, field_class=Field,
message_class=Message):
self.messages = {}
self.types = {
x: simple_type_class(x) for x in [
'i8', 'i16', 'i32', 'i64',
'u8', 'u16', 'u32', 'u64',
'f64'
]
}
self.simple_type_class = simple_type_class
self.struct_type_class = struct_type_class
self.field_class = field_class
self.message_class = message_class
self.exceptions = []
self.json_files = []
self.types_by_json = {}
self.messages_by_json = {}
self.logger = logger
for f in files:
self.parse_json_file(f)
self.finalize_parsing()
def parse_json_file(self, path):
self.logger.info("Parsing json api file: `%s'" % path)
self.json_files.append(path)
self.types_by_json[path] = {}
self.messages_by_json[path] = {}
with open(path) as f:
j = json.load(f)
for t in j['types']:
try:
type_ = self.struct_type_class(t, self.types,
self.field_class)
if type_.name in self.types:
raise ParseError("Duplicate type `%s'" % type_.name)
except ParseError as e:
self.exceptions.append(e)
continue
self.types[type_.name] = type_
self.types_by_json[path][type_.name] = type_
for m in j['messages']:
try:
msg = self.message_class(self.logger, m, self.types,
self.struct_type_class,
self.simple_type_class,
self.field_class)
if msg.name in self.messages:
raise ParseError("Duplicate message `%s'" % msg.name)
except ParseError as e:
self.exceptions.append(e)
continue
self.messages[msg.name] = msg
self.messages_by_json[path][msg.name] = msg
def get_reply(self, message):
if self.messages[message].is_dump():
return self.messages["%s_details" % message[:-len("_dump")]]
return self.messages["%s_reply" % message]
def finalize_parsing(self):
if len(self.messages) == 0:
for e in self.exceptions:
self.logger.error(e)
raise Exception("No messages parsed.")
for jn, j in self.messages_by_json.items():
remove = []
for n, m in j.items():
try:
if not m.is_reply():
try:
m.reply = self.get_reply(n)
except:
raise ParseError(
"Cannot find reply to message `%s'" % n)
except ParseError as e:
self.exceptions.append(e)
remove.append(n)
self.messages_by_json[jn] = {
k: v for k, v in j.items() if k not in remove}
|
