# $Id$
+# $URL$
from types import StringTypes, IntType, LongType
import time
import calendar
+from PLC.Timestamp import Timestamp
from PLC.Faults import *
from PLC.Parameter import Parameter
+
class Row(dict):
"""
Representation of a row in a database table. To use, optionally
else:
raise PLCInvalidArguemnt, "No such associate function associate_%s" % args[1]
- def validate_timestamp(self, timestamp, check_future = False):
- """
- Validates the specified GMT timestamp string (must be in
- %Y-%m-%d %H:%M:%S format) or number (seconds since UNIX epoch,
- i.e., 1970-01-01 00:00:00 GMT). If check_future is True,
- raises an exception if timestamp is not in the future. Returns
- a GMT timestamp string.
- """
-
- time_format = "%Y-%m-%d %H:%M:%S"
-
- if isinstance(timestamp, StringTypes):
- # calendar.timegm() is the inverse of time.gmtime()
- timestamp = calendar.timegm(time.strptime(timestamp, time_format))
-
- # Human readable timestamp string
- human = time.strftime(time_format, time.gmtime(timestamp))
-
- if check_future and timestamp < time.time():
- raise PLCInvalidArgument, "'%s' not in the future" % human
-
- return human
+ def validate_timestamp (self, timestamp):
+ return Timestamp.sql_validate(timestamp)
def add_object(self, classobj, join_table, columns = None):
"""
return dict ( [ (key,value) for (key,value) in obj.iteritems()
if key in self.tags and Row.is_writable(key,value,self.tags) ] )
- # takes in input a list of columns, returns 2 dicts and one list
- # fields, tags, rejected
+ # takes as input a list of columns, sort native fields from tags
+ # returns 2 dicts and one list : fields, tags, rejected
@classmethod
def parse_columns (cls, columns):
(fields,tags,rejected)=({},{},[])
else: rejected.append(column)
return (fields,tags,rejected)
+ # compute the 'accepts' part of a method, from a list of column names, and a fields dict
+ # use exclude=True to exclude the column names instead
+ # typically accepted_fields (Node.fields,['hostname','model',...])
+ @staticmethod
+ def accepted_fields (update_columns, fields_dict, exclude=False):
+ result={}
+ for (k,v) in fields_dict.iteritems():
+ if (not exclude and k in update_columns) or (exclude and k not in update_columns):
+ result[k]=v
+ return result
+
+ # filter out user-provided fields that are not part of the declared acceptance list
+ # keep it separate from split_fields for simplicity
+ # typically check_fields (<user_provided_dict>,{'hostname':Parameter(str,...),'model':Parameter(..)...})
+ @staticmethod
+ def check_fields (user_dict, accepted_fields):
+# avoid the simple, but silent, version
+# return dict ([ (k,v) for (k,v) in user_dict.items() if k in accepted_fields ])
+ result={}
+ for (k,v) in user_dict.items():
+ if k in accepted_fields: result[k]=v
+ else: raise PLCInvalidArgument ('Trying to set/change unaccepted key %s'%k)
+ return result
+
# given a dict (typically passed to an Update method), we check and sort
# them against a list of dicts, e.g. [Node.fields, Node.related_fields]
# return is a list that contains n+1 dicts, last one has the rejected fields
result.append(rejected)
return result
- # compute the accepts part of an update method from a list of column names, and a (list of) fields dict
- @staticmethod
- def accepted_fields (can_update_columns, fields):
- result={}
- if not isinstance(fields,list): fields = [fields]
- for dict in fields:
- for (k,v) in dict.iteritems():
- if k in can_update_columns:
- result[k]=v
- return result
-
### class initialization : create tag-dependent cross view if needed
@classmethod
def tagvalue_view_name (cls, tagname):
"""
returns a SQL sentence that creates a view named after the primary_key and tagname,
with 2 columns
- (*) column 1: name=self.primary_key
- (*) column 2: name=tagname value=tagvalue
+ (*) column 1: primary_key
+ (*) column 2: actual tag value, renamed into tagname
"""
- if not cls.view_tags_name: return ""
+ if not cls.view_tags_name:
+ raise Exception, 'WARNING: class %s needs to set view_tags_name'%cls.__name__
table_name=cls.table_name
primary_key=cls.primary_key
view_tags_name=cls.view_tags_name
tagvalue_view_name=cls.tagvalue_view_name(tagname)
return 'CREATE OR REPLACE VIEW %(tagvalue_view_name)s ' \
- 'as SELECT %(table_name)s.%(primary_key)s,%(view_tags_name)s.tagvalue as "%(tagname)s" ' \
+ 'as SELECT %(table_name)s.%(primary_key)s,%(view_tags_name)s.value as "%(tagname)s" ' \
'from %(table_name)s right join %(view_tags_name)s using (%(primary_key)s) ' \
'WHERE tagname = \'%(tagname)s\';'%locals()
tag_columns={}
else:
(columns,tag_columns,rejected) = classobj.parse_columns(columns)
- if not columns:
+ if not columns and not tag_columns:
raise PLCInvalidArgument, "No valid return fields specified for class %s"%classobj.__name__
if rejected:
raise PLCInvalidArgument, "unknown column(s) specified %r in %s"%(rejected,classobj.__name__)
git://git.onelab.eu / plcapi.git / blobdiff