sfa/util/table.py

   1 ### $Id$
   2 ### $URL$
   3 #
   4 # implements support for SFA records stored in db tables
   5 #
   6 # TODO: Use existing PLC database methods? or keep this separate?
   7
   8 import report
   9 import pgdb
  10
  11 from sfa.util.PostgreSQL import *
  12 from sfa.trust.gid import *
  13 from sfa.util.record import *
  14 from sfa.util.debug import *
  15 from sfa.util.config import *
  16 from sfa.util.filter import *
  17
  18 class SfaTable(list):
  19
  20     SFA_TABLE_PREFIX = "sfa"
  21
  22     def __init__(self, record_filter = None):
  23
  24         # pgsql doesn't like table names with "." in them, to replace it with "$"
  25         self.tablename = SfaTable.SFA_TABLE_PREFIX
  26         self.config = Config()
  27         self.db = PostgreSQL(self.config)
  28
  29         if record_filter:
  30             records = self.find(record_filter)
  31             for record in records:
  32                 self.append(record)
  33
  34     def exists(self):
  35         sql = "SELECT * from pg_tables"
  36         tables = self.db.selectall(sql)
  37         tables = filter(lambda row: row['tablename'].startswith(self.SFA_TABLE_PREFIX), tables)
  38         if tables:
  39             return True
  40         return False
  41     def db_fields(self, obj=None):
  42
  43         db_fields = self.db.fields(self.SFA_TABLE_PREFIX)
  44         return dict( [ (key,value) for (key, value) in obj.items() \
  45                         if key in db_fields and
  46                         self.is_writable(key, value, SfaRecord.fields)] )
  47
  48     @staticmethod
  49     def is_writable (key,value,dict):
  50         # if not mentioned, assume it's writable (e.g. deleted ...)
  51         if key not in dict: return True
  52         # if mentioned but not linked to a Parameter object, idem
  53         if not isinstance(dict[key], Parameter): return True
  54         # if not marked ro, it's writable
  55         if not dict[key].ro: return True
  56
  57         return False
  58
  59
  60     def create(self):
  61
  62         querystr = "CREATE TABLE " + self.tablename + " ( \
  63                 record_id serial PRIMARY KEY , \
  64                 hrn text NOT NULL, \
  65                 authority text NOT NULL, \
  66                 peer_authority text, \
  67                 gid text, \
  68                 type text NOT NULL, \
  69                 pointer integer, \
  70                 date_created timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP, \
  71                 last_updated timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP);"
  72         template = "CREATE INDEX %s_%s_idx ON %s (%s);"
  73         indexes = [template % ( self.tablename, field, self.tablename, field) \
  74                    for field in ['hrn', 'type', 'authority', 'peer_authority', 'pointer']]
  75         # IF EXISTS doenst exist in postgres < 8.2
  76         try:
  77             self.db.do('DROP TABLE IF EXISTS ' + self.tablename)
  78         except:
  79             try:
  80                 self.db.do('DROP TABLE' + self.tablename)
  81             except:
  82                 pass
  83
  84         self.db.do(querystr)
  85         for index in indexes:
  86             self.db.do(index)
  87
  88         self.db.commit()
  89
  90     def remove(self, record):
  91         params = {'record_id': record['record_id']}
  92         template = "DELETE FROM %s " % self.tablename
  93         sql = template + "WHERE record_id = %(record_id)s"
  94         self.db.do(sql, params)
  95
  96         # if this is a site, remove all records where 'authority' == the
  97         # site's hrn
  98         if record['type'] == 'authority':
  99             params = {'authority': record['hrn']}
 100             sql = template + "WHERE authority = %(authority)s"
 101             self.db.do(sql, params)
 102         self.db.commit()
 103
 104     def insert(self, record):
 105         db_fields = self.db_fields(record)
 106         keys = db_fields.keys()
 107         values = [self.db.param(key, value) for (key, value) in db_fields.items()]
 108         query_str = "INSERT INTO " + self.tablename + \
 109                        "(" + ",".join(keys) + ") " + \
 110                        "VALUES(" + ",".join(values) + ")"
 111         self.db.do(query_str, db_fields)
 112         self.db.commit()
 113         result = self.find({'hrn': record['hrn'], 'type': record['type'], 'peer_authority': record['peer_authority']})
 114         if not result:
 115             record_id = None
 116         elif isinstance(result, list):
 117             record_id = result[0]['record_id']
 118         else:
 119             record_id = result['record_id']
 120
 121         return record_id
 122
 123     def update(self, record):
 124         db_fields = self.db_fields(record)
 125         keys = db_fields.keys()
 126         values = [self.db.param(key, value) for (key, value) in db_fields.items()]
 127         columns = ["%s = %s" % (key, value) for (key, value) in zip(keys, values)]
 128         query_str = "UPDATE %s SET %s WHERE record_id = %s" % \
 129                     (self.tablename, ", ".join(columns), record['record_id'])
 130         self.db.do(query_str, db_fields)
 131         self.db.commit()
 132
 133     def quote_string(self, value):
 134         return str(self.db.quote(value))
 135
 136     def quote(self, value):
 137         return self.db.quote(value)
 138
 139     def find(self, record_filter = None, columns=None):
 140         if not columns:
 141             columns = "*"
 142         else:
 143             columns = ",".join(columns)
 144         sql = "SELECT %s FROM %s WHERE True " % (columns, self.tablename)
 145
 146         if isinstance(record_filter, (list, tuple, set)):
 147             ints = filter(lambda x: isinstance(x, (int, long)), record_filter)
 148             strs = filter(lambda x: isinstance(x, StringTypes), record_filter)
 149             record_filter = Filter(SfaRecord.all_fields, {'record_id': ints, 'hrn': strs})
 150             sql += "AND (%s) %s " % record_filter.sql("OR")
 151         elif isinstance(record_filter, dict):
 152             record_filter = Filter(SfaRecord.all_fields, record_filter)
 153             sql += " AND (%s) %s" % record_filter.sql("AND")
 154         elif isinstance(record_filter, StringTypes):
 155             record_filter = Filter(SfaRecord.all_fields, {'hrn':[record_filter]})
 156             sql += " AND (%s) %s" % record_filter.sql("AND")
 157         elif isinstance(record_filter, int):
 158             record_filter = Filter(SfaRecord.all_fields, {'record_id':[record_filter]})
 159             sql += " AND (%s) %s" % record_filter.sql("AND")
 160
 161         results = self.db.selectall(sql)
 162         if isinstance(results, dict):
 163             results = [results]
 164         return results
 165
 166     def findObjects(self, record_filter = None, columns=None):
 167
 168         results = self.find(record_filter, columns)
 169         result_rec_list = []
 170         for result in results:
 171             if result['type'] in ['authority']:
 172                 result_rec_list.append(AuthorityRecord(dict=result))
 173             elif result['type'] in ['node']:
 174                 result_rec_list.append(NodeRecord(dict=result))
 175             elif result['type'] in ['slice']:
 176                 result_rec_list.append(SliceRecord(dict=result))
 177             elif result['type'] in ['user']:
 178                 result_rec_list.append(UserRecord(dict=result))
 179             else:
 180                 result_rec_list.append(SfaRecord(dict=result))
 181         return result_rec_list
 182
 183
 184     def drop(self):
 185         try:
 186             self.db.do('DROP TABLE IF EXISTS ' + self.tablename)
 187             self.db.commit()
 188         except:
 189             try:
 190                 self.db.do('DROP TABLE ' + self.tablename)
 191                 self.db.commit()
 192             except:
 193                 pass
 194
 195     def sfa_records_purge(self):
 196         self.drop()