sfa/util/genitable.py

   1 # genitable.py
   2 #
   3 # implements support for geni records stored in db tables
   4 #
   5 # TODO: Use existing PLC database methods? or keep this separate?
   6
   7 ### $Id$
   8 ### $URL$
   9
  10 import report
  11 import  pgdb
  12 from pg import DB, ProgrammingError
  13 from sfa.trust.gid import *
  14 from sfa.util.record import *
  15 from sfa.util.debug import *
  16 from sfa.util.config import *
  17 from sfa.util.filter import *
  18
  19 class GeniTable(list):
  20
  21     GENI_TABLE_PREFIX = "sfa"
  22
  23     def __init__(self, record_filter = None):
  24
  25         # pgsql doesn't like table names with "." in them, to replace it with "$"
  26         self.tablename = GeniTable.GENI_TABLE_PREFIX
  27
  28         # establish a connection to the pgsql server
  29         cninfo = Config().get_plc_dbinfo()
  30         self.cnx = DB(cninfo['dbname'], cninfo['address'], port=cninfo['port'], user=cninfo['user'], passwd=cninfo['password'])
  31
  32         if record_filter:
  33             records = self.find(record_filter)
  34             for record in reocrds:
  35                 self.append(record)
  36
  37     def exists(self):
  38         tableList = self.cnx.get_tables()
  39         if 'public.' + self.tablename in tableList:
  40             return True
  41         if 'public."' + self.tablename + '"' in tableList:
  42             return True
  43         return False
  44
  45     def create(self):
  46
  47         querystr = "CREATE TABLE " + self.tablename + " ( \
  48                 record_id serial PRIMARY KEY , \
  49                 hrn text NOT NULL, \
  50                 authority text NOT NULL, \
  51                 gid text, \
  52                 type text NOT NULL, \
  53                 pointer integer, \
  54                 date_created timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP, \
  55                 last_updated timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP);"
  56         template = "CREATE INDEX %s_%s_idx ON %s (%s);"
  57         indexes = [template % ( self.tablename, field, self.tablename, field) \
  58                    for field in ['hrn', 'type', 'authority', 'pointer']]
  59         # IF EXISTS doenst exist in postgres < 8.2
  60         try:
  61             self.cnx.query('DROP TABLE IF EXISTS ' + self.tablename)
  62         except ProgrammingError:
  63             try:
  64                 self.cnx.query('DROP TABLE ' + self.tablename)
  65             except ProgrammingError:
  66                 pass
  67
  68         self.cnx.query(querystr)
  69         for index in indexes:
  70             self.cnx.query(index)
  71
  72     def remove(self, record):
  73         query_str = "DELETE FROM %s WHERE record_id = %s" % (self.tablename, record['record_id'])
  74         self.cnx.query(query_str)
  75
  76     def insert(self, record):
  77         dont_insert = ['date_created', 'last_updated']
  78         fields = [field for field in  record.fields.keys() if field not in dont_insert]
  79         fieldnames = ["pointer"] + fields
  80         fieldvals = record.get_field_value_strings(fieldnames)
  81         query_str = "INSERT INTO " + self.tablename + \
  82                        "(" + ",".join(fieldnames) + ") " + \
  83                        "VALUES(" + ",".join(fieldvals) + ")"
  84         #print query_str
  85         self.cnx.query(query_str)
  86
  87     def update(self, record):
  88         dont_update = ['date_created', 'last_updated']
  89         fields = [field for field in  record.fields.keys() if field not in dont_update]
  90         fieldvals = record.get_field_value_strings(fields)
  91         pairs = []
  92         for field in fields:
  93             val = record.get_field_value_string(field)
  94             pairs.append(field + " = " + val)
  95         update = ", ".join(pairs)
  96
  97         query_str = "UPDATE %s SET %s WHERE record_id = %s" % \
  98                     (self.tablename, update, record['record_id'])
  99         #print query_str
 100         self.cnx.query(query_str)
 101
 102     def quote(self, value):
 103         """
 104         Returns quoted version of the specified value.
 105         """
 106
 107         # The pgdb._quote function is good enough for general SQL
 108         # quoting, except for array types.
 109         if isinstance(value, (list, tuple, set)):
 110             return "ARRAY[%s]" % ", ".join(map, self.quote, value)
 111         else:
 112             return pgdb._quote(value)
 113
 114     def find(self, record_filter = None):
 115         sql = "SELECT * FROM %s WHERE True " % self.tablename
 116
 117         if isinstance(record_filter, (list, tuple, set)):
 118             ints = filter(lambda x: isinstance(x, (int, long)), record_filter)
 119             strs = filter(lambda x: isinstance(x, StringTypes), record_filter)
 120             record_filter = Filter(GeniRecord.all_fields, {'record_id': ints, 'hrn': strs})
 121             sql += "AND (%s) %s " % record_filter.sql("OR")
 122         elif isinstance(record_filter, dict):
 123             record_filter = Filter(GeniRecord.all_fields, record_filter)
 124             sql += " AND (%s) %s" % record_filter.sql("AND")
 125         elif isinstance(record_filter, StringTypes):
 126             record_filter = Filter(GeniRecord.all_fields, {'hrn':[record_filter]})
 127             sql += " AND (%s) %s" % record_filter.sql("AND")
 128         elif isinstance(record_filter, int):
 129             record_filter = Filter(GeniRecord.all_fields, {'record_id':[record_filter]})
 130             sql += " AND (%s) %s" % record_filter.sql("AND")
 131         results = self.cnx.query(sql).dictresult()
 132         return results
 133
 134     def findObjects(self, record_filter = None):
 135
 136         results = self.find(record_filter)
 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(GeniRecord(dict=result))
 149         return result_rec_list
 150
 151
 152     def drop(self):
 153         try:
 154             self.cnx.query('DROP TABLE IF EXISTS ' + self.tablename)
 155         except ProgrammingError:
 156             try:
 157                 self.cnx.query('DROP TABLE ' + self.tablename)
 158             except ProgrammingError:
 159                 pass
 160
 161     @staticmethod
 162     def geni_records_purge(cninfo):
 163
 164         cnx = DB(cninfo['dbname'], cninfo['address'],
 165                  port=cninfo['port'], user=cninfo['user'], passwd=cninfo['password'])
 166         tableList = cnx.get_tables()
 167         for table in tableList:
 168             if table.startswith(GeniTable.GENI_TABLE_PREFIX) or \
 169                     table.startswith('public.' + GeniTable.GENI_TABLE_PREFIX) or \
 170                     table.startswith('public."' + GeniTable.GENI_TABLE_PREFIX):
 171                 report.trace("dropping table " + table)
 172                 cnx.query("DROP TABLE " + table)