geni/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 import report
   8
   9 from pg import DB, ProgrammingError
  10 from gid import *
  11 from record import *
  12
  13 GENI_TABLE_PREFIX = "geni$"
  14
  15 class GeniTable():
  16     def __init__(self, create=False, hrn="unspecified.default.registry", cninfo=None):
  17         global GENI_TABLE_PREFIX
  18
  19         self.hrn = hrn
  20
  21         # pgsql doesn't like table names with "." in them, to replace it with "$"
  22         self.tablename = GENI_TABLE_PREFIX + self.hrn.replace(".", "$")
  23
  24         # establish a connection to the pgsql server
  25         self.cnx = DB(cninfo['dbname'], cninfo['address'], port=cninfo['port'], user=cninfo['user'], passwd=cninfo['password'])
  26
  27         # if asked to create the table, then create it
  28         if create:
  29             self.create()
  30
  31     def exists(self):
  32         tableList = self.cnx.get_tables()
  33         if 'public.' + self.tablename in tableList:
  34             return True
  35         if 'public."' + self.tablename + '"' in tableList:
  36             return True
  37         return False
  38
  39     def create(self):
  40
  41         querystr = "CREATE TABLE " + self.tablename + " ( \
  42                 key text, \
  43                 name text, \
  44                 gid text, \
  45                 type text, \
  46                 pointer integer);"
  47         template = "CREATE INDEX %s_%s_idx ON %s (%s);"
  48         indexes = [template % ( self.tablename, field, self.tablename, field) \
  49                    for field in ['name', 'type' ]]
  50         # IF EXISTS doenst exist in postgres < 8.2
  51         try:
  52             self.cnx.query('DROP TABLE IF EXISTS ' + self.tablename)
  53         except ProgrammingError:
  54             try:
  55                 self.cnx.query('DROP TABLE ' + self.tablename)
  56             except ProgrammingError:
  57                 pass
  58
  59         self.cnx.query(querystr)
  60         for index in indexes:
  61             self.cnx.query(index)
  62
  63     def remove(self, record):
  64         query_str = "DELETE FROM " + self.tablename + " WHERE key = '" + record.get_key() + "'"
  65         self.cnx.query(query_str)
  66
  67     def insert(self, record):
  68         fieldnames = ["key"] + record.get_field_names()
  69         fieldvals = record.get_field_value_strings(fieldnames)
  70         query_str = "INSERT INTO " + self.tablename + \
  71                        "(" + ",".join(fieldnames) + ") " + \
  72                        "VALUES(" + ",".join(fieldvals) + ")"
  73         #print query_str
  74         self.cnx.query(query_str)
  75
  76     def update(self, record):
  77         names = record.get_field_names()
  78         pairs = []
  79         for name in names:
  80            val = record.get_field_value_string(name)
  81            pairs.append(name + " = " + val)
  82         update = ", ".join(pairs)
  83
  84         query_str = "UPDATE " + self.tablename+ " SET " + update + " WHERE key = '" + record.get_key() + "'"
  85         #print query_str
  86         self.cnx.query(query_str)
  87
  88     def find_dict(self, type, value, searchfield):
  89         query_str = "SELECT * FROM " + self.tablename + " WHERE " + searchfield + " = '" + str(value) + "'"
  90         dict_list = self.cnx.query(query_str).dictresult()
  91         result_dict_list = []
  92         for dict in dict_list:
  93            if (type=="*") or (dict['type'] == type):
  94                result_dict_list.append(dict)
  95         return result_dict_list
  96
  97     def find(self, type, value, searchfield):
  98         result_dict_list = self.find_dict(type, value, searchfield)
  99         result_rec_list = []
 100         for dict in result_dict_list:
 101             result_rec_list.append(GeniRecord(dict=dict))
 102         return result_rec_list
 103
 104     def resolve_dict(self, type, hrn):
 105         return self.find_dict(type, hrn, "name")
 106
 107     def resolve(self, type, hrn):
 108         return self.find(type, hrn, "name")
 109
 110     def list_dict(self):
 111         query_str = "SELECT * FROM " + self.tablename
 112         result_dict_list = self.cnx.query(query_str).dictresult()
 113         return result_dict_list
 114
 115     def list(self):
 116         result_dict_list = self.list_dict()
 117         result_rec_list = []
 118         for dict in result_dict_list:
 119             result_rec_list.append(GeniRecord(dict=dict))
 120         return result_rec_list
 121
 122 def set_geni_table_prefix(x):
 123     global GENI_TABLE_PREFIX
 124
 125     GENI_TABLE_PREFIX = x
 126
 127 def geni_records_purge(cninfo):
 128     global GENI_TABLE_PREFIX
 129
 130     cnx = DB(cninfo['dbname'], cninfo['address'], port=cninfo['port'], user=cninfo['user'], passwd=cninfo['password'])
 131     tableList = cnx.get_tables()
 132     for table in tableList:
 133         if table.startswith(GENI_TABLE_PREFIX) or \
 134            table.startswith('public.' + GENI_TABLE_PREFIX) or \
 135            table.startswith('public."' + GENI_TABLE_PREFIX):
 136                report.trace("dropping table " + table)
 137                cnx.query("DROP TABLE " + table)