sfa/storage/table.py

   1 #
   2 # implements support for SFA records stored in db tables
   3 #
   4 # TODO: Use existing PLC database methods? or keep this separate?
   5
   6 from types import StringTypes
   7
   8 from sfa.util.config import Config
   9
  10 from sfa.storage.parameter import Parameter
  11 from sfa.storage.filter import Filter
  12 from sfa.storage.PostgreSQL import PostgreSQL
  13 from sfa.storage.record import SfaRecord, AuthorityRecord, NodeRecord, SliceRecord, UserRecord
  14
  15 class SfaTable(list):
  16
  17     SFA_TABLE_PREFIX = "records"
  18
  19     def __init__(self, record_filter = None):
  20
  21         # pgsql doesn't like table names with "." in them, to replace it with "$"
  22         self.tablename = SfaTable.SFA_TABLE_PREFIX
  23         self.config = Config()
  24         self.db = PostgreSQL(self.config)
  25
  26         if record_filter:
  27             records = self.find(record_filter)
  28             for record in records:
  29                 self.append(record)
  30
  31     def db_fields(self, obj=None):
  32
  33         db_fields = self.db.fields(self.SFA_TABLE_PREFIX)
  34         return dict( [ (key,value) for (key, value) in obj.iteritems() \
  35                         if key in db_fields and
  36                         self.is_writable(key, value, SfaRecord.fields)] )
  37
  38     @staticmethod
  39     def is_writable (key,value,dict):
  40         # if not mentioned, assume it's writable (e.g. deleted ...)
  41         if key not in dict: return True
  42         # if mentioned but not linked to a Parameter object, idem
  43         if not isinstance(dict[key], Parameter): return True
  44         # if not marked ro, it's writable
  45         if not dict[key].ro: return True
  46
  47         return False
  48
  49
  50     def clear (self):
  51         self.db.do("DELETE from %s"%self.tablename)
  52         self.db.commit()
  53
  54     # what sfa-nuke does
  55     def nuke (self):
  56         self.clear()
  57
  58     def remove(self, record):
  59         params = {'record_id': record['record_id']}
  60         template = "DELETE FROM %s " % self.tablename
  61         sql = template + "WHERE record_id = %(record_id)s"
  62         self.db.do(sql, params)
  63
  64         # if this is a site, remove all records where 'authority' == the
  65         # site's hrn
  66         if record['type'] == 'authority':
  67             params = {'authority': record['hrn']}
  68             sql = template + "WHERE authority = %(authority)s"
  69             self.db.do(sql, params)
  70         self.db.commit()
  71
  72     def insert(self, record):
  73         db_fields = self.db_fields(record)
  74         keys = db_fields.keys()
  75         values = [self.db.param(key, value) for (key, value) in db_fields.iteritems()]
  76         query_str = "INSERT INTO " + self.tablename + \
  77                        "(" + ",".join(keys) + ") " + \
  78                        "VALUES(" + ",".join(values) + ")"
  79         self.db.do(query_str, db_fields)
  80         self.db.commit()
  81         result = self.find({'hrn': record['hrn'], 'type': record['type'], 'peer_authority': record['peer_authority']})
  82         if not result:
  83             record_id = None
  84         elif isinstance(result, list):
  85             record_id = result[0]['record_id']
  86         else:
  87             record_id = result['record_id']
  88
  89         return record_id
  90
  91     def update(self, record):
  92         db_fields = self.db_fields(record)
  93         keys = db_fields.keys()
  94         values = [self.db.param(key, value) for (key, value) in db_fields.iteritems()]
  95         columns = ["%s = %s" % (key, value) for (key, value) in zip(keys, values)]
  96         query_str = "UPDATE %s SET %s WHERE record_id = %s" % \
  97                     (self.tablename, ", ".join(columns), record['record_id'])
  98         self.db.do(query_str, db_fields)
  99         self.db.commit()
 100
 101     def quote_string(self, value):
 102         return str(self.db.quote(value))
 103
 104     def quote(self, value):
 105         return self.db.quote(value)
 106
 107     def find(self, record_filter = None, columns=None):
 108         if not columns:
 109             columns = "*"
 110         else:
 111             columns = ",".join(columns)
 112         sql = "SELECT %s FROM %s WHERE True " % (columns, self.tablename)
 113
 114         if isinstance(record_filter, (list, tuple, set)):
 115             ints = filter(lambda x: isinstance(x, (int, long)), record_filter)
 116             strs = filter(lambda x: isinstance(x, StringTypes), record_filter)
 117             record_filter = Filter(SfaRecord.all_fields, {'record_id': ints, 'hrn': strs})
 118             sql += "AND (%s) %s " % record_filter.sql("OR")
 119         elif isinstance(record_filter, dict):
 120             record_filter = Filter(SfaRecord.all_fields, record_filter)
 121             sql += " AND (%s) %s" % record_filter.sql("AND")
 122         elif isinstance(record_filter, StringTypes):
 123             record_filter = Filter(SfaRecord.all_fields, {'hrn':[record_filter]})
 124             sql += " AND (%s) %s" % record_filter.sql("AND")
 125         elif isinstance(record_filter, int):
 126             record_filter = Filter(SfaRecord.all_fields, {'record_id':[record_filter]})
 127             sql += " AND (%s) %s" % record_filter.sql("AND")
 128
 129         results = self.db.selectall(sql)
 130         if isinstance(results, dict):
 131             results = [results]
 132         return results
 133
 134     def findObjects(self, record_filter = None, columns=None):
 135
 136         results = self.find(record_filter, columns)
 137         result_rec_list = []
 138         for result in results:
 139             if result['type'] in ['authority']:
 140                 result_rec_list.append(AuthorityRecord(dict=result))
 141             elif result['type'] in ['node']:
 142                 result_rec_list.append(NodeRecord(dict=result))
 143             elif result['type'] in ['slice']:
 144                 result_rec_list.append(SliceRecord(dict=result))
 145             elif result['type'] in ['user']:
 146                 result_rec_list.append(UserRecord(dict=result))
 147             else:
 148                 result_rec_list.append(SfaRecord(dict=result))
 149         return result_rec_list
 150
 151