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
  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         querystr = "CREATE TABLE " + self.tablename + " ( \
  41                 key text, \
  42                 name text, \
  43                 gid text, \
  44                 type text, \
  45                 pointer integer);"
  46
  47         self.cnx.query('DROP TABLE IF EXISTS ' + self.tablename)
  48         self.cnx.query(querystr)
  49
  50     def remove(self, record):
  51         query_str = "DELETE FROM " + self.tablename + " WHERE key = '" + record.get_key() + "'"
  52         self.cnx.query(query_str)
  53
  54     def insert(self, record):
  55         fieldnames = ["key"] + record.get_field_names()
  56         fieldvals = record.get_field_value_strings(fieldnames)
  57         query_str = "INSERT INTO " + self.tablename + \
  58                        "(" + ",".join(fieldnames) + ") " + \
  59                        "VALUES(" + ",".join(fieldvals) + ")"
  60         #print query_str
  61         self.cnx.query(query_str)
  62
  63     def update(self, record):
  64         names = record.get_field_names()
  65         pairs = []
  66         for name in names:
  67            val = record.get_field_value_string(name)
  68            pairs.append(name + " = " + val)
  69         update = ", ".join(pairs)
  70
  71         query_str = "UPDATE " + self.tablename+ " SET " + update + " WHERE key = '" + record.get_key() + "'"
  72         #print query_str
  73         self.cnx.query(query_str)
  74
  75     def find_dict(self, type, value, searchfield):
  76         query_str = "SELECT * FROM " + self.tablename + " WHERE " + searchfield + " = '" + str(value) + "'"
  77         dict_list = self.cnx.query(query_str).dictresult()
  78         result_dict_list = []
  79         for dict in dict_list:
  80            if (type=="*") or (dict['type'] == type):
  81                result_dict_list.append(dict)
  82         return result_dict_list
  83
  84     def find(self, type, value, searchfield):
  85         result_dict_list = self.find_dict(type, value, searchfield)
  86         result_rec_list = []
  87         for dict in result_dict_list:
  88             result_rec_list.append(GeniRecord(dict=dict))
  89         return result_rec_list
  90
  91     def resolve_dict(self, type, hrn):
  92         return self.find_dict(type, hrn, "name")
  93
  94     def resolve(self, type, hrn):
  95         return self.find(type, hrn, "name")
  96
  97     def list_dict(self):
  98         query_str = "SELECT * FROM " + self.tablename
  99         result_dict_list = self.cnx.query(query_str).dictresult()
 100         return result_dict_list
 101
 102     def list(self):
 103         result_dict_list = self.list_dict()
 104         result_rec_list = []
 105         for dict in result_dict_list:
 106             result_rec_list.append(GeniRecord(dict=dict))
 107         return result_rec_list
 108
 109 def set_geni_table_prefix(x):
 110     global GENI_TABLE_PREFIX
 111
 112     GENI_TABLE_PREFIX = x
 113
 114 def geni_records_purge(cninfo):
 115     global GENI_TABLE_PREFIX
 116
 117     cnx = DB(cninfo['dbname'], cninfo['address'], port=cninfo['port'], user=cninfo['user'], passwd=cninfo['password'])
 118     tableList = cnx.get_tables()
 119     for table in tableList:
 120         if table.startswith(GENI_TABLE_PREFIX) or \
 121            table.startswith('public.' + GENI_TABLE_PREFIX) or \
 122            table.startswith('public."' + GENI_TABLE_PREFIX):
 123                report.trace("dropping table " + table)
 124                cnx.query("DROP TABLE " + table)