def __init__( self ):
self._data = PersistencyManager()
self._mods = []
self.lastGeneratedId = {}
class PersistencyInterface( object ):
def __init__( self ):
self._data = PersistencyManager()
self._mods = []
self.lastGeneratedId = {}
def query(self, wip):
try:
if wip == 'MODS':
tmp = self._mods
self._mods = []
return tmp
return self._query(wip, wip)
# except EntityError as e:
# print 'Error in method\n\tQuery: ' + wip + '\n\tMethod: ' + e.method + '\n\tMessage: ' + e.msg
# raise DataLayerError('Error in the DataLayer. Query: ' + wip)
# except ModelError as e:
# print 'Error in method\n\tQuery: ' + wip + '\n\tMethod: ' + e.method + '\n\tMessage: ' + e.msg
# raise DataLayerError('Error in the DataLayer. Query: ' + wip)
except KeyError:
print 'Unknown KeyError'
raise DataLayerError('Error in the DataLayer. Query: ' + wip)
except:
print 'Unknown OtherError'
print '-'*60
traceback.print_exc(file=sys.stdout)
print '-'*60
e = 'DataLayer: Unknown error'
raise DataLayerError('Error in the DataLayer. Query: ' + wip)
def _query(self, wip, original):
# print '--> %s -> %s' % (original.__repr__(), wip.__repr__(), )
resp = []
# Handling of multiple commands
# example: '<expr>.&.<expr>'
wip = wip.split('.&.')
if len(wip)>1:
resp = [self._query(x, original) for x in wip]
resp = [x for x in resp if x != None]
return resp
wip = wip[0]
# Handling request for schemas names
# example: ''
# return [schema names]
if len(wip) == 0:
return self._data.getInfo()
# Handling insertion of new schema
# example '+.fileName'
if len(wip) and wip[0] == '+':
self._data.addModel(wip[2:])
self._mods.append(wip)
return
# Handling removal of existing schema
# example '-.modelName'
if len(wip) and wip[0] == '-':
self._data.removeModel(wip[2:])
self._mods.append(wip)
return
# Handling ids requests
# example '!.abc.ecology'
if len(wip) and wip[0] == '!':
return self.lastGeneratedId[wip[2:]]
# Handling subscription
# resending query with no subscribtion token
if Q_SUBSCRIBE in wip:
return self._query(wip[len(Q_SUBSCRIBE):], original)
# Handling basic commands
else:
data = wip.split('.')
# Return if some issues arose in the computations
# Need to return None for the '.&.' to work
if 'None' in data:
return None
self._checkConsistency( data )
expansion = self._getExpansionArray(data)
# Branch executed if query contains intra queries
if True in expansion:
idx = expansion.index(True)
before = '.'.join( data[:idx] )
after = '.'.join( data[idx+1:] )
if len(before):
before += '.'
if len(after):
after = '.'+ after
# example: '<expr1>[]<expr>'
# becomes: '<expr1>[eval(expr1)]<expr>'
if data[idx] == '[]':
expanded = self._query( before[:-1], wip )
# if original[0] == '#' and exapnded == '[]':
# exapnded = None
return self._query( before + str(expanded) + after, original )
else:
# just to be faster ... check the case of concrete inner query to avoid the try ... except and eval ...
# same as except branch
if '.' in data[idx]:
if ']:[' in data[idx]:
tokens = data[idx][1:-1].split(':')
expanded = ''
for tok in tokens:
if tok[-1] == ']': tok = tok[:-1]
if tok[0] == '[': tok = tok[1:]
tmp = self._query(tok, wip)
if isinstance(tmp,list):
# print '<><>' +str(tmp)
tmp = tmp[0]
expanded += str(tmp)
expanded += ':'
return self._query( before + str(expanded[:-1]) + after, original )
expanded = self._query( data[idx][1:-1], wip )
# if not len(expanded):
# return expanded
return self._query( before + str(expanded) + after, original )
try:
# example: '<expr>[id1, ... ,idN]<expr>'
# becomes: '<expr>.id1.<expr>.&. ... .&.<expr>.idN.<expr>' <-- Handled by the previous if
# in case of strange errors during debug uncomment the following line
# wip = long(data[idx][1:-1].split(',')[0])
wip = eval(data[idx])
if not isinstance(wip, list):
raise
return self._query( '.&.'.join( before + str(x) + after for x in wip), original )
except:
# example: '<expr>[<expr1>]<expr>'
# becomes: '<expr>[eval(expr1)]<expr>'
expanded = self._query( data[idx][1:-1], wip )
# if not len(expanded):
# return expanded
return self._query( before + str(expanded) + after, original )
else:
# In case no expansions need to be evaluated, terminate the evaluation of the query in the case of a subscribtion
if Q_SUBSCRIBE in original:
return wip
# Handle request of entities name
# example: 'abc'
# return [entity names]
if len(data) == 1:
return self._data.getInfo(data[0])
# Handle request of ids present for an entity
# example: 'abc.activity'
# return [ids]
if len(data) == 2:
return self._data.getInfo(data[0], data[1])
# Handle request of fields/relations names or the insertion of a new entity entry
# example: 'abc.activity.123' or 'abc.activity.+'
# return [fields + refs] or id
if len(data) == 3:
if data[2] == '+':
self._mods.append(wip)
currId = self._data.add(data[0], data[1])
self.lastGeneratedId[data[0]+'.'+data[1]] = currId
return currId
else:
return self._data.getInfo(data[0], data[1], long(data[2]))
# Handle the request of a concrete field/relation or the removal of an entity entry
# example: 'abc.activity.123.name' or 'abc.activity.123.user' or 'abc.activity.-.123'
# return val or return [ids] or nothing
if len(data) == 4:
if data[2] == '-':
self._data.remove(data[0], data[1], long(data[3]))
self._mods.append(wip)
return
return self._data.getInfo(data[0], data[1], long(data[2]), data[3])
# Handle the request for field info
# example: 'abc.activity.123.name.?'
# return val or return [field info]
if len(data) == 5:
return self._data.getFieldInfo(data[0], data[1], long(data[2]), data[3])
# Handle the assignment of a value to a field or the insertion/removal of a relation as well as the comparison of a value
# example: 'abc.activity.123.name.=.val' or 'abc.activity.123.user.+.val' or
# 'abc.activity.123.user.-.val' or' abc.application_state.[].user.==.val'
# no return
if len(data) == 6:
if data[4] == '=':
self._data.update(data[0], data[1], long(data[2]), data[3], self._cleanValue(data[5]))
self._mods.append(wip)
elif data[4] == '+':
self._data.ref(data[0], data[1], long(data[2]), data[3], long(data[5]))
self._mods.append(wip)
elif data[4] == '-':
self._data.deref(data[0], data[1], long(data[2]), data[3], long(data[5]))
self._mods.append(wip)
# TODO > Check == is it a comparison?
elif data[4] == '==':
try:
wip = self._data.get(data[0], data[1], long(data[2]), data[3])
# TODO > CHECK might be a problem
except EntityError:
return None
except ModelError:
return None
resp = False
tmp = self._cleanValue(data[5])
try:
tmp = long(tmp)
wip = long(wip)
except:
pass
if isinstance(wip, list):
resp = tmp in wip
else:
resp = wip == tmp
return long(data[2]) if resp else None
elif data[4] == '~=':
# >>> a = ['12345:67812345:678','123454:67812345:678','12345:67812345:000']
# >>> check = '(12345):[0-9]*:[0-9]*'
# >>> list( x.group() for x in list( re.search(check,y) for y in a ) if x != None )
# ['12345:67812345:678', '12345:67812345:000']
# abc.ecology.[].name.~=.{{(12345):[0-9]*:[0-9]*}}
regexp = self._cleanValue(data[5])
# check = self._data.get(data[0], data[1], long(data[2]), data[3])
check = self._query( '.'.join(data[:4]), original )
ret = check if re.search(regexp,check) else None
return ret if not ret else self._query( '.'.join(data[:4]) + '.==.' + ret, original )
return
# Method to remove delimiters, default: value delimiter
def _cleanValue(self, val, delimiter=Q_VALUE_DELIMITER):
tmp = val
if tmp in Q_PLACE_HOLDERS:
print '>> changing' + val + ' - ' + Q_PLACE_HOLDERS[0]
if tmp == Q_PLACE_HOLDERS[0]:
return str(DT.now())
if delimiter[0] in tmp:
tmp = tmp[len(delimiter[0]):]
if delimiter[1] in tmp:
tmp = tmp[:-len(delimiter[1])]
return tmp
# Method to control parenthesis and value delimiter consistency
def _checkConsistency(self, data):
toCheck = [Q_EXPANSION_DELIMITER, Q_VALUE_DELIMITER]
currentIdx = 0
while currentIdx < len(toCheck):
modified = False
delim = toCheck[currentIdx]
#expA = [ len(x)>=len(delim[0]) and x[0:len(delim[0])]==delim[0] for x in data]
#expB = [ len(x)>=len(delim[1]) and x[-len(delim[1]):]==delim[1] for x in data]
r = []
for x in data:
r.append(0)
if len(x)<len(delim[0]):
continue
while r[-1]<len(data[len(r)-1]) and data[len(r)-1][r[-1]:r[-1]+len(delim[0])] == delim[0]:
r[-1] += 1
expA = r
r = []
for x in data:
r.append(0)
if len(x)<len(delim[1]):
continue
while r[-1]<len(data[len(r)-1]):
check = False
if not r[-1]:
check = data[len(r)-1][-(len(delim[1])+r[-1]):] == delim[1]
else:
check = data[len(r)-1][-(len(delim[1])+r[-1]):-(r[-1])] == delim[1]
if not check:
break
r[-1] += 1
expB = r
idx = 0
other = 0
for i, x in enumerate(expA):
other += expA[i]
other -= expB[i]
if expA[i]!=expB[i]:
idx = i
break
# print expA
# print expB
# print other
# print data
if idx and other > 0:
modified = True
while other:
data[i] += '.'+data[i+1]
del data[i+1]
idx += 1
other += expA[idx]
other -= expB[idx]
if not modified:
currentIdx += 1
# Returns a machine readable representation of the query with information about the possible inter queries
def _getExpansionArray(self, data):
return [ x[0]==Q_EXPANSION_DELIMITER[0] and x[-1]==Q_EXPANSION_DELIMITER[1] for x in data]