qapi: rework qapi Exception

Use a base class QAPIError, and QAPIParseError for parser errors and
QAPISemError for semantic errors, suggested by Markus Armbruster.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20170113144135.5150-12-marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-01-13 15:41:25 +01:00 committed by Markus Armbruster
parent 91d00e57a1
commit 4148c298d8

View File

@ -91,35 +91,38 @@ def error_path(parent):
return res
class QAPISchemaError(Exception):
def __init__(self, schema, msg):
class QAPIError(Exception):
def __init__(self, fname, line, col, incl_info, msg):
Exception.__init__(self)
self.fname = schema.fname
self.fname = fname
self.line = line
self.col = col
self.info = incl_info
self.msg = msg
self.col = 1
self.line = schema.line
for ch in schema.src[schema.line_pos:schema.pos]:
def __str__(self):
loc = "%s:%d" % (self.fname, self.line)
if self.col is not None:
loc += ":%s" % self.col
return error_path(self.info) + "%s: %s" % (loc, self.msg)
class QAPIParseError(QAPIError):
def __init__(self, parser, msg):
col = 1
for ch in parser.src[parser.line_pos:parser.pos]:
if ch == '\t':
self.col = (self.col + 7) % 8 + 1
col = (col + 7) % 8 + 1
else:
self.col += 1
self.info = schema.incl_info
def __str__(self):
return error_path(self.info) + \
"%s:%d:%d: %s" % (self.fname, self.line, self.col, self.msg)
col += 1
QAPIError.__init__(self, parser.fname, parser.line, col,
parser.incl_info, msg)
class QAPIExprError(Exception):
def __init__(self, expr_info, msg):
Exception.__init__(self)
assert expr_info
self.info = expr_info
self.msg = msg
def __str__(self):
return error_path(self.info['parent']) + \
"%s:%d: %s" % (self.info['file'], self.info['line'], self.msg)
class QAPISemError(QAPIError):
def __init__(self, info, msg):
QAPIError.__init__(self, info['file'], info['line'], None,
info['parent'], msg)
class QAPISchemaParser(object):
@ -140,24 +143,23 @@ class QAPISchemaParser(object):
self.accept()
while self.tok is not None:
expr_info = {'file': fname, 'line': self.line,
info = {'file': fname, 'line': self.line,
'parent': self.incl_info}
expr = self.get_expr(False)
if isinstance(expr, dict) and "include" in expr:
if len(expr) != 1:
raise QAPIExprError(expr_info,
"Invalid 'include' directive")
raise QAPISemError(info, "Invalid 'include' directive")
include = expr["include"]
if not isinstance(include, str):
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Value of 'include' must be a string")
incl_abs_fname = os.path.join(os.path.dirname(abs_fname),
include)
# catch inclusion cycle
inf = expr_info
inf = info
while inf:
if incl_abs_fname == os.path.abspath(inf['file']):
raise QAPIExprError(expr_info, "Inclusion loop for %s"
raise QAPISemError(info, "Inclusion loop for %s"
% include)
inf = inf['parent']
# skip multiple include of the same file
@ -166,14 +168,13 @@ class QAPISchemaParser(object):
try:
fobj = open(incl_abs_fname, 'r')
except IOError as e:
raise QAPIExprError(expr_info,
'%s: %s' % (e.strerror, include))
raise QAPISemError(info, '%s: %s' % (e.strerror, include))
exprs_include = QAPISchemaParser(fobj, previously_included,
expr_info)
info)
self.exprs.extend(exprs_include.exprs)
else:
expr_elem = {'expr': expr,
'info': expr_info}
'info': info}
self.exprs.append(expr_elem)
def accept(self):
@ -194,8 +195,7 @@ class QAPISchemaParser(object):
ch = self.src[self.cursor]
self.cursor += 1
if ch == '\n':
raise QAPISchemaError(self,
'Missing terminating "\'"')
raise QAPIParseError(self, 'Missing terminating "\'"')
if esc:
if ch == 'b':
string += '\b'
@ -213,7 +213,7 @@ class QAPISchemaParser(object):
ch = self.src[self.cursor]
self.cursor += 1
if ch not in "0123456789abcdefABCDEF":
raise QAPISchemaError(self,
raise QAPIParseError(self,
'\\u escape needs 4 '
'hex digits')
value = (value << 4) + int(ch, 16)
@ -222,7 +222,7 @@ class QAPISchemaParser(object):
# Unicode string defaults. But most of QAPI is
# ASCII-only, so we aren't losing much for now.
if not value or value > 0x7f:
raise QAPISchemaError(self,
raise QAPIParseError(self,
'For now, \\u escape '
'only supports non-zero '
'values up to \\u007f')
@ -230,7 +230,7 @@ class QAPISchemaParser(object):
elif ch in "\\/'\"":
string += ch
else:
raise QAPISchemaError(self,
raise QAPIParseError(self,
"Unknown escape \\%s" % ch)
esc = False
elif ch == "\\":
@ -259,7 +259,7 @@ class QAPISchemaParser(object):
self.line += 1
self.line_pos = self.cursor
elif not self.tok.isspace():
raise QAPISchemaError(self, 'Stray "%s"' % self.tok)
raise QAPIParseError(self, 'Stray "%s"' % self.tok)
def get_members(self):
expr = OrderedDict()
@ -267,24 +267,24 @@ class QAPISchemaParser(object):
self.accept()
return expr
if self.tok != "'":
raise QAPISchemaError(self, 'Expected string or "}"')
raise QAPIParseError(self, 'Expected string or "}"')
while True:
key = self.val
self.accept()
if self.tok != ':':
raise QAPISchemaError(self, 'Expected ":"')
raise QAPIParseError(self, 'Expected ":"')
self.accept()
if key in expr:
raise QAPISchemaError(self, 'Duplicate key "%s"' % key)
raise QAPIParseError(self, 'Duplicate key "%s"' % key)
expr[key] = self.get_expr(True)
if self.tok == '}':
self.accept()
return expr
if self.tok != ',':
raise QAPISchemaError(self, 'Expected "," or "}"')
raise QAPIParseError(self, 'Expected "," or "}"')
self.accept()
if self.tok != "'":
raise QAPISchemaError(self, 'Expected string')
raise QAPIParseError(self, 'Expected string')
def get_values(self):
expr = []
@ -292,7 +292,7 @@ class QAPISchemaParser(object):
self.accept()
return expr
if self.tok not in "{['tfn":
raise QAPISchemaError(self, 'Expected "{", "[", "]", string, '
raise QAPIParseError(self, 'Expected "{", "[", "]", string, '
'boolean or "null"')
while True:
expr.append(self.get_expr(True))
@ -300,12 +300,12 @@ class QAPISchemaParser(object):
self.accept()
return expr
if self.tok != ',':
raise QAPISchemaError(self, 'Expected "," or "]"')
raise QAPIParseError(self, 'Expected "," or "]"')
self.accept()
def get_expr(self, nested):
if self.tok != '{' and not nested:
raise QAPISchemaError(self, 'Expected "{"')
raise QAPIParseError(self, 'Expected "{"')
if self.tok == '{':
self.accept()
expr = self.get_members()
@ -316,7 +316,7 @@ class QAPISchemaParser(object):
expr = self.val
self.accept()
else:
raise QAPISchemaError(self, 'Expected "{", "[" or string')
raise QAPIParseError(self, 'Expected "{", "[" or string')
return expr
#
@ -375,19 +375,17 @@ valid_name = re.compile('^(__[a-zA-Z0-9.-]+_)?'
'[a-zA-Z][a-zA-Z0-9_-]*$')
def check_name(expr_info, source, name, allow_optional=False,
def check_name(info, source, name, allow_optional=False,
enum_member=False):
global valid_name
membername = name
if not isinstance(name, str):
raise QAPIExprError(expr_info,
"%s requires a string name" % source)
raise QAPISemError(info, "%s requires a string name" % source)
if name.startswith('*'):
membername = name[1:]
if not allow_optional:
raise QAPIExprError(expr_info,
"%s does not allow optional name '%s'"
raise QAPISemError(info, "%s does not allow optional name '%s'"
% (source, name))
# Enum members can start with a digit, because the generated C
# code always prefixes it with the enum name
@ -397,8 +395,7 @@ def check_name(expr_info, source, name, allow_optional=False,
# and 'q_obj_*' implicit type names.
if not valid_name.match(membername) or \
c_name(membername, False).startswith('q_'):
raise QAPIExprError(expr_info,
"%s uses invalid name '%s'" % (source, name))
raise QAPISemError(info, "%s uses invalid name '%s'" % (source, name))
def add_name(name, info, meta, implicit=False):
@ -407,12 +404,10 @@ def add_name(name, info, meta, implicit=False):
# FIXME should reject names that differ only in '_' vs. '.'
# vs. '-', because they're liable to clash in generated C.
if name in all_names:
raise QAPIExprError(info,
"%s '%s' is already defined"
raise QAPISemError(info, "%s '%s' is already defined"
% (all_names[name], name))
if not implicit and (name.endswith('Kind') or name.endswith('List')):
raise QAPIExprError(info,
"%s '%s' should not end in '%s'"
raise QAPISemError(info, "%s '%s' should not end in '%s'"
% (meta, name, name[-4:]))
all_names[name] = meta
@ -465,7 +460,7 @@ def is_enum(name):
return find_enum(name) is not None
def check_type(expr_info, source, value, allow_array=False,
def check_type(info, source, value, allow_array=False,
allow_dict=False, allow_optional=False,
allow_metas=[]):
global all_names
@ -476,69 +471,64 @@ def check_type(expr_info, source, value, allow_array=False,
# Check if array type for value is okay
if isinstance(value, list):
if not allow_array:
raise QAPIExprError(expr_info,
"%s cannot be an array" % source)
raise QAPISemError(info, "%s cannot be an array" % source)
if len(value) != 1 or not isinstance(value[0], str):
raise QAPIExprError(expr_info,
"%s: array type must contain single type name"
% source)
raise QAPISemError(info,
"%s: array type must contain single type name" %
source)
value = value[0]
# Check if type name for value is okay
if isinstance(value, str):
if value not in all_names:
raise QAPIExprError(expr_info,
"%s uses unknown type '%s'"
raise QAPISemError(info, "%s uses unknown type '%s'"
% (source, value))
if not all_names[value] in allow_metas:
raise QAPIExprError(expr_info,
"%s cannot use %s type '%s'"
% (source, all_names[value], value))
raise QAPISemError(info, "%s cannot use %s type '%s'" %
(source, all_names[value], value))
return
if not allow_dict:
raise QAPIExprError(expr_info,
"%s should be a type name" % source)
raise QAPISemError(info, "%s should be a type name" % source)
if not isinstance(value, OrderedDict):
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"%s should be a dictionary or type name" % source)
# value is a dictionary, check that each member is okay
for (key, arg) in value.items():
check_name(expr_info, "Member of %s" % source, key,
check_name(info, "Member of %s" % source, key,
allow_optional=allow_optional)
if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'):
raise QAPIExprError(expr_info,
"Member of %s uses reserved name '%s'"
raise QAPISemError(info, "Member of %s uses reserved name '%s'"
% (source, key))
# Todo: allow dictionaries to represent default values of
# an optional argument.
check_type(expr_info, "Member '%s' of %s" % (key, source), arg,
check_type(info, "Member '%s' of %s" % (key, source), arg,
allow_array=True,
allow_metas=['built-in', 'union', 'alternate', 'struct',
'enum'])
def check_command(expr, expr_info):
def check_command(expr, info):
name = expr['command']
boxed = expr.get('boxed', False)
args_meta = ['struct']
if boxed:
args_meta += ['union', 'alternate']
check_type(expr_info, "'data' for command '%s'" % name,
check_type(info, "'data' for command '%s'" % name,
expr.get('data'), allow_dict=not boxed, allow_optional=True,
allow_metas=args_meta)
returns_meta = ['union', 'struct']
if name in returns_whitelist:
returns_meta += ['built-in', 'alternate', 'enum']
check_type(expr_info, "'returns' for command '%s'" % name,
check_type(info, "'returns' for command '%s'" % name,
expr.get('returns'), allow_array=True,
allow_optional=True, allow_metas=returns_meta)
def check_event(expr, expr_info):
def check_event(expr, info):
global events
name = expr['event']
boxed = expr.get('boxed', False)
@ -547,12 +537,12 @@ def check_event(expr, expr_info):
if boxed:
meta += ['union', 'alternate']
events.append(name)
check_type(expr_info, "'data' for event '%s'" % name,
check_type(info, "'data' for event '%s'" % name,
expr.get('data'), allow_dict=not boxed, allow_optional=True,
allow_metas=meta)
def check_union(expr, expr_info):
def check_union(expr, info):
name = expr['union']
base = expr.get('base')
discriminator = expr.get('discriminator')
@ -565,30 +555,28 @@ def check_union(expr, expr_info):
enum_define = None
allow_metas = ['built-in', 'union', 'alternate', 'struct', 'enum']
if base is not None:
raise QAPIExprError(expr_info,
"Simple union '%s' must not have a base"
% name)
raise QAPISemError(info, "Simple union '%s' must not have a base" %
name)
# Else, it's a flat union.
else:
# The object must have a string or dictionary 'base'.
check_type(expr_info, "'base' for union '%s'" % name,
check_type(info, "'base' for union '%s'" % name,
base, allow_dict=True, allow_optional=True,
allow_metas=['struct'])
if not base:
raise QAPIExprError(expr_info,
"Flat union '%s' must have a base"
raise QAPISemError(info, "Flat union '%s' must have a base"
% name)
base_members = find_base_members(base)
assert base_members
# The value of member 'discriminator' must name a non-optional
# member of the base struct.
check_name(expr_info, "Discriminator of flat union '%s'" % name,
check_name(info, "Discriminator of flat union '%s'" % name,
discriminator)
discriminator_type = base_members.get(discriminator)
if not discriminator_type:
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Discriminator '%s' is not a member of base "
"struct '%s'"
% (discriminator, base))
@ -596,92 +584,88 @@ def check_union(expr, expr_info):
allow_metas = ['struct']
# Do not allow string discriminator
if not enum_define:
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Discriminator '%s' must be of enumeration "
"type" % discriminator)
# Check every branch; don't allow an empty union
if len(members) == 0:
raise QAPIExprError(expr_info,
"Union '%s' cannot have empty 'data'" % name)
raise QAPISemError(info, "Union '%s' cannot have empty 'data'" % name)
for (key, value) in members.items():
check_name(expr_info, "Member of union '%s'" % name, key)
check_name(info, "Member of union '%s'" % name, key)
# Each value must name a known type
check_type(expr_info, "Member '%s' of union '%s'" % (key, name),
check_type(info, "Member '%s' of union '%s'" % (key, name),
value, allow_array=not base, allow_metas=allow_metas)
# If the discriminator names an enum type, then all members
# of 'data' must also be members of the enum type.
if enum_define:
if key not in enum_define['enum_values']:
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Discriminator value '%s' is not found in "
"enum '%s'" %
(key, enum_define["enum_name"]))
"enum '%s'"
% (key, enum_define["enum_name"]))
# If discriminator is user-defined, ensure all values are covered
if enum_define:
for value in enum_define['enum_values']:
if value not in members.keys():
raise QAPIExprError(expr_info,
"Union '%s' data missing '%s' branch"
raise QAPISemError(info, "Union '%s' data missing '%s' branch"
% (name, value))
def check_alternate(expr, expr_info):
def check_alternate(expr, info):
name = expr['alternate']
members = expr['data']
types_seen = {}
# Check every branch; require at least two branches
if len(members) < 2:
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Alternate '%s' should have at least two branches "
"in 'data'" % name)
for (key, value) in members.items():
check_name(expr_info, "Member of alternate '%s'" % name, key)
check_name(info, "Member of alternate '%s'" % name, key)
# Ensure alternates have no type conflicts.
check_type(expr_info, "Member '%s' of alternate '%s'" % (key, name),
check_type(info, "Member '%s' of alternate '%s'" % (key, name),
value,
allow_metas=['built-in', 'union', 'struct', 'enum'])
qtype = find_alternate_member_qtype(value)
if not qtype:
raise QAPIExprError(expr_info,
"Alternate '%s' member '%s' cannot use "
raise QAPISemError(info, "Alternate '%s' member '%s' cannot use "
"type '%s'" % (name, key, value))
if qtype in types_seen:
raise QAPIExprError(expr_info,
"Alternate '%s' member '%s' can't "
raise QAPISemError(info, "Alternate '%s' member '%s' can't "
"be distinguished from member '%s'"
% (name, key, types_seen[qtype]))
types_seen[qtype] = key
def check_enum(expr, expr_info):
def check_enum(expr, info):
name = expr['enum']
members = expr.get('data')
prefix = expr.get('prefix')
if not isinstance(members, list):
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Enum '%s' requires an array for 'data'" % name)
if prefix is not None and not isinstance(prefix, str):
raise QAPIExprError(expr_info,
raise QAPISemError(info,
"Enum '%s' requires a string for 'prefix'" % name)
for member in members:
check_name(expr_info, "Member of enum '%s'" % name, member,
check_name(info, "Member of enum '%s'" % name, member,
enum_member=True)
def check_struct(expr, expr_info):
def check_struct(expr, info):
name = expr['struct']
members = expr['data']
check_type(expr_info, "'data' for struct '%s'" % name, members,
check_type(info, "'data' for struct '%s'" % name, members,
allow_dict=True, allow_optional=True)
check_type(expr_info, "'base' for struct '%s'" % name, expr.get('base'),
check_type(info, "'base' for struct '%s'" % name, expr.get('base'),
allow_metas=['struct'])
@ -690,26 +674,23 @@ def check_keys(expr_elem, meta, required, optional=[]):
info = expr_elem['info']
name = expr[meta]
if not isinstance(name, str):
raise QAPIExprError(info,
"'%s' key must have a string value" % meta)
raise QAPISemError(info, "'%s' key must have a string value" % meta)
required = required + [meta]
for (key, value) in expr.items():
if key not in required and key not in optional:
raise QAPIExprError(info,
"Unknown key '%s' in %s '%s'"
raise QAPISemError(info, "Unknown key '%s' in %s '%s'"
% (key, meta, name))
if (key == 'gen' or key == 'success-response') and value is not False:
raise QAPIExprError(info,
raise QAPISemError(info,
"'%s' of %s '%s' should only use false value"
% (key, meta, name))
if key == 'boxed' and value is not True:
raise QAPIExprError(info,
raise QAPISemError(info,
"'%s' of %s '%s' should only use true value"
% (key, meta, name))
for key in required:
if key not in expr:
raise QAPIExprError(info,
"Key '%s' is missing from %s '%s'"
raise QAPISemError(info, "Key '%s' is missing from %s '%s'"
% (key, meta, name))
@ -743,7 +724,7 @@ def check_exprs(exprs):
check_keys(expr_elem, 'event', [], ['data', 'boxed'])
add_name(expr['event'], info, 'event')
else:
raise QAPIExprError(expr_elem['info'],
raise QAPISemError(expr_elem['info'],
"Expression is missing metatype")
# Try again for hidden UnionKind enum
@ -978,7 +959,7 @@ class QAPISchemaObjectType(QAPISchemaType):
def check(self, schema):
if self.members is False: # check for cycles
raise QAPIExprError(self.info,
raise QAPISemError(self.info,
"Object %s contains itself" % self.name)
if self.members:
return
@ -1051,12 +1032,11 @@ class QAPISchemaMember(object):
def check_clash(self, info, seen):
cname = c_name(self.name)
if cname.lower() != cname and self.owner not in case_whitelist:
raise QAPIExprError(info,
raise QAPISemError(info,
"%s should not use uppercase" % self.describe())
if cname in seen:
raise QAPIExprError(info,
"%s collides with %s"
% (self.describe(), seen[cname].describe()))
raise QAPISemError(info, "%s collides with %s" %
(self.describe(), seen[cname].describe()))
seen[cname] = self
def _pretty_owner(self):
@ -1201,14 +1181,13 @@ class QAPISchemaCommand(QAPISchemaEntity):
self.arg_type.check(schema)
if self.boxed:
if self.arg_type.is_empty():
raise QAPIExprError(self.info,
raise QAPISemError(self.info,
"Cannot use 'boxed' with empty type")
else:
assert not isinstance(self.arg_type, QAPISchemaAlternateType)
assert not self.arg_type.variants
elif self.boxed:
raise QAPIExprError(self.info,
"Use of 'boxed' requires 'data'")
raise QAPISemError(self.info, "Use of 'boxed' requires 'data'")
if self._ret_type_name:
self.ret_type = schema.lookup_type(self._ret_type_name)
assert isinstance(self.ret_type, QAPISchemaType)
@ -1235,14 +1214,13 @@ class QAPISchemaEvent(QAPISchemaEntity):
self.arg_type.check(schema)
if self.boxed:
if self.arg_type.is_empty():
raise QAPIExprError(self.info,
raise QAPISemError(self.info,
"Cannot use 'boxed' with empty type")
else:
assert not isinstance(self.arg_type, QAPISchemaAlternateType)
assert not self.arg_type.variants
elif self.boxed:
raise QAPIExprError(self.info,
"Use of 'boxed' requires 'data'")
raise QAPISemError(self.info, "Use of 'boxed' requires 'data'")
def visit(self, visitor):
visitor.visit_event(self.name, self.info, self.arg_type, self.boxed)
@ -1258,7 +1236,7 @@ class QAPISchema(object):
self._predefining = False
self._def_exprs()
self.check()
except (QAPISchemaError, QAPIExprError) as err:
except QAPIError as err:
print >>sys.stderr, err
exit(1)