def get_op(me, op_klas):
f = None
if issubclass(op_klas, op.Op1):
f = me.Func1(op_klas, me)
elif issubclass(op_klas, op.Op2):
f = me.Func2(op_klas, me)
else:
log("get_op unknown op_klas", op_klas)
assert 0
# log( 'get_op', op_klas.__name__, f.__class__.__name__)
return f
def get_op(me, op_klas):
f = None
if issubclass(op_klas, op.Op1):
f = me.Func1(op_klas, me)
elif issubclass(op_klas, op.Op2):
f = me.Func2(op_klas, me)
else:
log('get_op unknown op_klas', op_klas)
assert 0
#log( 'get_op', op_klas.__name__, f.__class__.__name__)
return f
def _external_dispatch(me, ext):
path2 = os.path.sep + me.q2.path_in_aspect
op_klas = me.q2.op_klas
if issubclass(op_klas, Operations.symlink):
Hardlink.getattr4symlink = True
op_klas = Operations.link
return me.context.get_op(op_klas)(ext.path, path2)
def __call__(me, path1, path2):
if not isinstance(path1, unicode):
path1 = unicode(path1, "utf-8")
if not isinstance(path2, unicode):
path2 = unicode(path2, "utf-8")
ctx = me.ctx
op_klas = me.op_klas
log("======== ", op_klas.__name__, path1, path2)
d1 = me._from_path(path1)
d2 = me._from_path(path2)
if d1.malformed or d2.malformed:
return -op_klas.malformed
fname = d1.typ + "_" + d2.typ
op_klas1, func1 = me._get_op_func(d1.asp, op_klas, fname)
op_klas2, func2 = me._get_op_func(d2.asp, op_klas, fname)
if me.use_coercion:
func = func1 or func2
else:
i1 = len(ctx.aspects) if d1.asp is Aspect else ctx.aspects.index(d1.asp)
if i1 > ctx.aspects.index(d2.asp):
op_klas, func = op_klas2, func2
else:
op_klas, func = op_klas1, func1
if not func:
log("func:", fname + " not implemented")
return -op_klas.not_implemented
if me.use_coercion:
op_klas = op_klas1 if func1 else op_klas2
if issubclass(op_klas2, op_klas1): # mimic python rules for coercion
func = func2
op_klas = op_klas2
return me._exec(func, op_klas(ctx, d1.q, d2.q), d1.obj, d2.obj)
def _external_dispatch(me, ext):
path2 = os.path.sep + me.q2.path_in_aspect
op_klas = me.q2.op_klas
if issubclass(op_klas, Operations.symlink):
Hardlink.getattr4symlink = True
op_klas = Operations.link
return me.context.get_op(op_klas)(ext.path, path2)
def __call__(me, path1, path2):
if not isinstance(path1, unicode): path1 = unicode(path1, 'utf-8')
if not isinstance(path2, unicode): path2 = unicode(path2, 'utf-8')
ctx = me.ctx
op_klas = me.op_klas
log('======== ', op_klas.__name__, path1, path2)
d1 = me._from_path(path1)
d2 = me._from_path(path2)
if d1.malformed or d2.malformed:
return -op_klas.malformed
fname = d1.typ + '_' + d2.typ
op_klas1, func1 = me._get_op_func(d1.asp, op_klas, fname)
op_klas2, func2 = me._get_op_func(d2.asp, op_klas, fname)
if me.use_coercion:
func = func1 or func2
else:
i1 = len(
ctx.aspects) if d1.asp is Aspect else ctx.aspects.index(
d1.asp)
if i1 > ctx.aspects.index(d2.asp):
op_klas, func = op_klas2, func2
else:
op_klas, func = op_klas1, func1
if not func:
log('func:', fname + ' not implemented')
return -op_klas.not_implemented
if me.use_coercion:
op_klas = op_klas1 if func1 else op_klas2
if issubclass(op_klas2,
op_klas1): # mimic python rules for coercion
func = func2
op_klas = op_klas2
return me._exec(func, op_klas(ctx, d1.q, d2.q), d1.obj, d2.obj)
def check4alias( me):
if not issubclass( me.op_klas, (Operations.getattr, Operations.readlink)):
Aspect.aliases.clear()
me.alias_path_in_use = None
return None
if me.full_path != Aspect.alias_path_in_use:
Aspect.aliases.pop( Aspect.alias_path_in_use, None)
Aspect.alias_path_in_use = me.full_path
return Aspect.aliases.get( me.full_path, None)
def _init( me, aspects):
me._rexp = '^/'+me.dir_name()+'$'
for op_name, op_klas in vars(me).iteritems():
op_klas = getattr( me, op_name, op_klas)
if issubclass( op_klas, (Op1,Op2)):
class new_op_klas( op_klas):
aspects = aspects
new_op_klas.__name__ = op_klas.__name__
setattr( me, op_name, new_op_klas)
def __init__( cls, name, bases, dct):
if not cls.operandType or not cls.resultType:
return
operand = cls.operandType.__name__.lower()
result = cls.resultType.__name__.lower()
for op_name, op_klas in vars(QAspect).iteritems():
op_klas = getattr( cls, op_name, op_klas)
if issubclass( op_klas, (Op1,Op2)):
class new_op_klas( op_klas): pass
new_op_klas.__name__ = op_klas.__name__
cls.rename_meth( op_klas, new_op_klas, 'operand', operand)
cls.rename_meth( op_klas, new_op_klas, 'result', result)
setattr( cls, op_name, new_op_klas)
parser = cls.Parser
parser.result = property( lambda me: getattr( me, result), lambda me, val: setattr( me, result, val))
parser.operand = property( lambda me: getattr( me, operand), lambda me, val: setattr( me, operand, val))
stat_res = me._dispatch()
#if os.path.split( me.q.path_in_aspect)[0] and isinstance( stat_res, stat_result):
if Hardlink.getattr4symlink and isinstance(stat_res, stat_result):
all = list(stat_res)
log('original:', all)
all[0] = all[0] | S_IFLNK
log('new:', all)
stat_res = stat_result(all)
Hardlink.getattr4symlink = False
return stat_res
Hardlink.getattr = getattr_
for op_name, op_klas in vars(Operations).iteritems():
if not issubclass(op_klas, (Op1, Op2)): continue
klas = getattr(Hardlink, op_name, op_klas)
A = None
if issubclass(op_klas, Op1) and not getattr(klas, 'dispatch', None):
class A(klas):
dispatch = Hardlink._dispatch.im_func
if issubclass(op_klas,
Op2) and not getattr(klas, 'external_dispatch', None):
class A(klas):
external_dispatch = Hardlink._external_dispatch.im_func
if A:
setattr(Hardlink, op_name, A)
def _parse( me):
qgram = me.context.query_grammar
me.tree = []
me.complete = False
tokens = [ t for t in me.path_in_aspect.split( os.path.sep) if t ]
log('tokens', tokens)
ands = []
me.last_token = None
me.pending_logic = None
have_negative = False
for i, token in enumerate(tokens):
me.last_token = token
if token == qgram.eval_:
if ands:
me.tree.append( ands)
me.complete = True
opath_tokens = tokens[ i+1:] # skip '='
if opath_tokens:
path_tail = os.path.join( *opath_tokens)
me.setup_result( path_tail)
if not me.result.id:
me.error = me.unknownResult( path_tail)
else:
me.error = me.unknownOperand( token)
break
elif token == qgram.or_:
if not ands or have_negative or me.pending_logic:
me.error = me.unknownOperand( token)
break
me.tree.append( ands)
ands = []
me.pending_logic = token
elif token == qgram.and_:
if have_negative or me.pending_logic:
me.error = me.unknownOperand( token)
break
me.pending_logic = token
elif token == qgram.not_:
if have_negative:
me.error = me.unknownOperand( token)
break
have_negative = True
me.pending_logic = token
#elif token == qgram.root:
# log('ERROR: unexpected symbol for root')
# assert 0
else:
logic = me.pending_logic
if logic:
me.pending_logic = None
op = me.token2operand( token)
if logic == qgram.not_:
op = QAspect.Negative( op)
me.operand = op
if not op.id:
if logic:
me.error = me.unknownOperand( token)
break
if (ands
and issubclass( me.op_klas, (Op2, Operations.getattr))
and i == len(tokens)-1):
me.tree.append( ands)
me.setup_result( token)
if not me.result.id:
me.error = me.unknownResult( token)
else:
me.error = me.unknownOperand( token) # XXX is it needed?
break
positive = getattr( op, 'operand', op) # if negative
if ands and positive in ands:
me.error = me.unknownOperand( token)
break
if logic in (qgram.not_, qgram.or_) and [ positive ] in me.tree:
me.error = me.unknownOperand( token)
break
ands.append( op)
else:
if ands:
me.tree.append( ands)
if me.result.id or getattr( me.error, 'expected_type', None) == me.result.__class__:
return me.result
if me.last_token and me.last_token not in qgram.values():# and me.tree:
return me.operand
# path ends with something from query_grammar
return 'query'
def is_external( me):
return (me.path_in_aspect is None
and issubclass( me.op_klas, Op2)
and not me.full_path.startswith( me.context.mountpoint))
stat_res = me._dispatch()
# if os.path.split( me.q.path_in_aspect)[0] and isinstance( stat_res, stat_result):
if Hardlink.getattr4symlink and isinstance(stat_res, stat_result):
all = list(stat_res)
log("original:", all)
all[0] = all[0] | S_IFLNK
log("new:", all)
stat_res = stat_result(all)
Hardlink.getattr4symlink = False
return stat_res
Hardlink.getattr = getattr_
for op_name, op_klas in vars(Operations).iteritems():
if not issubclass(op_klas, (Op1, Op2)):
continue
klas = getattr(Hardlink, op_name, op_klas)
A = None
if issubclass(op_klas, Op1) and not getattr(klas, "dispatch", None):
class A(klas):
dispatch = Hardlink._dispatch.im_func
if issubclass(op_klas, Op2) and not getattr(klas, "external_dispatch", None):
class A(klas):
external_dispatch = Hardlink._external_dispatch.im_func
if A:
setattr(Hardlink, op_name, A)
