code: def init(self):
          
          if not self.export_enable:
              return None
  
          if self.user is None:
              server_uri = 'http://{}:{}/'.format(self.host,
                                                  self.port)
          else:
              server_uri = 'http://{}:{}@{}:{}/'.format(self.user,
                                                        self.password,
                                                        self.host,
                                                        self.port)
  
          try:
              s = couchdb.Server(server_uri)
          except Exception as e:
              logger.critical("Cannot connect to CouchDB server %s (%s)" % (server_uri, e))
              sys.exit(2)
          else:
              logger.info("Connected to the CouchDB server %s" % server_uri)
  
          try:
              s[self.db]
          except Exception as e:
              # Database did not exist
              # Create it...
              s.create(self.db)
          else:
              logger.info("There is already a %s database" % self.db)
  
          return s
docs: Init the connection to the CouchDB server.