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