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authorKlement Sekera <ksekera@cisco.com>2017-05-04 06:15:18 +0200
committerNeale Ranns <nranns@cisco.com>2017-09-19 12:23:44 +0000
commit8f2a4eafeaa439432107563033728e09665c16d9 (patch)
treea8db2c9f35e169a2eb48a7f5aebb88f146029f5f /src/vpp-api/vapi/vapi_json_parser.py
parentf4215a65cb5858b276b0b096273270e7c017209d (diff)
Add new C API
Change-Id: I717ce3cd7c867c155de149ec56623269d26d0ff7 Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src/vpp-api/vapi/vapi_json_parser.py')
-rw-r--r--src/vpp-api/vapi/vapi_json_parser.py303
1 files changed, 303 insertions, 0 deletions
diff --git a/src/vpp-api/vapi/vapi_json_parser.py b/src/vpp-api/vapi/vapi_json_parser.py
new file mode 100644
index 00000000000..57a2238322b
--- /dev/null
+++ b/src/vpp-api/vapi/vapi_json_parser.py
@@ -0,0 +1,303 @@
+#!/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}