Method ChangeZeroAddress

dgraphtest/zero_state.go:193–212

ChangeZeroAddress reconfigures the Zero at id with a new --my flag that points to its Docker container name (a valid DNS alias on the cluster network). The Zero is stopped, recreated with its WAL preserved, and restarted. The new address is returned so callers can assert convergence.

(id int)

// network). The Zero is stopped, recreated with its WAL preserved, and
// restarted. The new address is returned so callers can assert convergence.
func (c *LocalCluster) ChangeZeroAddress(id int) (string, error) {
	if err := c.StopZero(id); err != nil {
		return "", err
	}
	containerName, err := c.GetZeroContainerName(id)
	if err != nil {
		return "", err
	}
	newAddr := containerName + ":" + zeroGrpcPort
	if err := c.SetZeroMyAddr(id, newAddr); err != nil {
		return "", err
	}
	if err := c.RecreateZero(id); err != nil {
		return "", err
	}
	if err := c.StartZero(id); err != nil {
		return "", err
	}
	return newAddr, nil
}

// containerIdxFromAddr extracts the numeric suffix from the "zeroN" segment
// of a member's address and returns it as the container index used by tests.