sfa/util/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 sfa.util.PostgreSQL import *
   7 from sfa.trust.gid import *
   8 from sfa.util.record import *
   9 from sfa.util.config import *
  10 from sfa.util.filter import *
  11
  12 class SfaTable(list):
  13
  14     SFA_TABLE_PREFIX = "sfa"
  15
  16     def __init__(self, record_filter = None):
  17
  18         # pgsql doesn't like table names with "." in them, to replace it with "$"
  19         self.tablename = SfaTable.SFA_TABLE_PREFIX
  20         self.config = Config()
  21         self.db = PostgreSQL(self.config)
  22
  23         if record_filter:
  24             records = self.find(record_filter)
  25             for record in records:
  26                 self.append(record)
  27
  28     def exists(self):
  29         sql = "SELECT * from pg_tables"
  30         tables = self.db.selectall(sql)
  31         tables = filter(lambda row: row['tablename'].startswith(self.SFA_TABLE_PREFIX), tables)
  32         if tables:
  33             return True
  34         return False
  35     def db_fields(self, obj=None):
  36
  37         db_fields = self.db.fields(self.SFA_TABLE_PREFIX)
  38         return dict( [ (key,value) for (key, value) in obj.items() \
  39                         if key in db_fields and
  40                         self.is_writable(key, value, SfaRecord.fields)] )
  41
  42     @staticmethod
  43     def is_writable (key,value,dict):
  44         # if not mentioned, assume it's writable (e.g. deleted ...)
  45         if key not in dict: return True
  46         # if mentioned but not linked to a Parameter object, idem
  47         if not isinstance(dict[key], Parameter): return True
  48         # if not marked ro, it's writable
  49         if not dict[key].ro: return True
  50
  51         return False
  52
  53
  54     def create(self):
  55
  56         querystr = "CREATE TABLE " + self.tablename + " ( \
  57                 record_id serial PRIMARY KEY , \
  58                 hrn text NOT NULL, \
  59                 authority text NOT NULL, \
  60                 peer_authority text, \
  61                 gid text, \
  62                 type text NOT NULL, \
  63                 pointer integer, \
  64                 date_created timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP, \
  65                 last_updated timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP);"
  66         template = "CREATE INDEX %s_%s_idx ON %s (%s);"
  67         indexes = [template % ( self.tablename, field, self.tablename, field) \
  68                    for field in ['hrn', 'type', 'authority', 'peer_authority', 'pointer']]
  69         # IF EXISTS doenst exist in postgres < 8.2
  70         try:
  71             self.db.do('DROP TABLE IF EXISTS ' + self.tablename)
  72         except:
  73             try:
  74                 self.db.do('DROP TABLE' + self.tablename)
  75             except:
  76                 pass
  77
  78         self.db.do(querystr)
  79         for index in indexes:
  80             self.db.do(index)
  81
  82         self.db.commit()
  83
  84     def remove(self, record):
  85         params = {'record_id': record['record_id']}
  86         template = "DELETE FROM %s " % self.tablename
  87         sql = template + "WHERE record_id = %(record_id)s"
  88         self.db.do(sql, params)
  89
  90         # if this is a site, remove all records where 'authority' == the
  91         # site's hrn
  92         if record['type'] == 'authority':
  93             params = {'authority': record['hrn']}
  94             sql = template + "WHERE authority = %(authority)s"
  95             self.db.do(sql, params)
  96         self.db.commit()
  97
  98     def insert(self, record):
  99         db_fields = self.db_fields(record)
 100         keys = db_fields.keys()
 101         values = [self.db.param(key, value) for (key, value) in db_fields.items()]
 102         query_str = "INSERT INTO " + self.tablename + \
 103                        "(" + ",".join(keys) + ") " + \
 104                        "VALUES(" + ",".join(values) + ")"
 105         self.db.do(query_str, db_fields)
 106         self.db.commit()
 107         result = self.find({'hrn': record['hrn'], 'type': record['type'], 'peer_authority': record['peer_authority']})
 108         if not result:
 109             record_id = None
 110         elif isinstance(result, list):
 111             record_id = result[0]['record_id']
 112         else:
 113             record_id = result['record_id']
 114
 115         return record_id
 116
 117     def update(self, record):
 118         db_fields = self.db_fields(record)
 119         keys = db_fields.keys()
 120         values = [self.db.param(key, value) for (key, value) in db_fields.items()]
 121         columns = ["%s = %s" % (key, value) for (key, value) in zip(keys, values)]
 122         query_str = "UPDATE %s SET %s WHERE record_id = %s" % \
 123                     (self.tablename, ", ".join(columns), record['record_id'])
 124         self.db.do(query_str, db_fields)
 125         self.db.commit()
 126
 127     def quote_string(self, value):
 128         return str(self.db.quote(value))
 129
 130     def quote(self, value):
 131         return self.db.quote(value)
 132
 133     def find(self, record_filter = None, columns=None):
 134         if not columns:
 135             columns = "*"
 136         else:
 137             columns = ",".join(columns)
 138         sql = "SELECT %s FROM %s WHERE True " % (columns, self.tablename)
 139
 140         if isinstance(record_filter, (list, tuple, set)):
 141             ints = filter(lambda x: isinstance(x, (int, long)), record_filter)
 142             strs = filter(lambda x: isinstance(x, StringTypes), record_filter)
 143             record_filter = Filter(SfaRecord.all_fields, {'record_id': ints, 'hrn': strs})
 144             sql += "AND (%s) %s " % record_filter.sql("OR")
 145         elif isinstance(record_filter, dict):
 146             record_filter = Filter(SfaRecord.all_fields, record_filter)
 147             sql += " AND (%s) %s" % record_filter.sql("AND")
 148         elif isinstance(record_filter, StringTypes):
 149             record_filter = Filter(SfaRecord.all_fields, {'hrn':[record_filter]})
 150             sql += " AND (%s) %s" % record_filter.sql("AND")
 151         elif isinstance(record_filter, int):
 152             record_filter = Filter(SfaRecord.all_fields, {'record_id':[record_filter]})
 153             sql += " AND (%s) %s" % record_filter.sql("AND")
 154
 155         results = self.db.selectall(sql)
 156         if isinstance(results, dict):
 157             results = [results]
 158         return results
 159
 160     def findObjects(self, record_filter = None, columns=None):
 161
 162         results = self.find(record_filter, columns)
 163         result_rec_list = []
 164         for result in results:
 165             if result['type'] in ['authority']:
 166                 result_rec_list.append(AuthorityRecord(dict=result))
 167             elif result['type'] in ['node']:
 168                 result_rec_list.append(NodeRecord(dict=result))
 169             elif result['type'] in ['slice']:
 170                 result_rec_list.append(SliceRecord(dict=result))
 171             elif result['type'] in ['user']:
 172                 result_rec_list.append(UserRecord(dict=result))
 173             else:
 174                 result_rec_list.append(SfaRecord(dict=result))
 175         return result_rec_list
 176
 177
 178     def drop(self):
 179         try:
 180             self.db.do('DROP TABLE IF EXISTS ' + self.tablename)
 181             self.db.commit()
 182         except:
 183             try:
 184                 self.db.do('DROP TABLE ' + self.tablename)
 185                 self.db.commit()
 186             except:
 187                 pass
 188
 189     def sfa_records_purge(self):
 190         self.drop()