def get_azure_secret(self, vault_name, key_name, version=None, **kwargs):
        '''
        @dev get secret from azure key vault
        @param vault_name key vault name
        @param key_name sercrt's key
        @param version version of the secret to get. if unspecified, gets the latest version
        @return secret(KeyVaultSecret)
        '''
        update_mempool = True
        secret = None
        key = self.create_memory_key_with_args(vault_name, key_name, version)
        if self.use_mempool:
            secret = self.get_memory_key_value(key)
            if not secret:
                secret = azure_get_secret(vault_name, key_name, version, **kwargs)
            else:
                update_mempool = False
        else:
            secret = azure_get_secret(vault_name, key_name, version, **kwargs)

        if update_mempool:
            self.set_memory_key_value(key, secret)
        return secret