func (z *zkCluster) AddQueryNode(n clustering.QueryNode) (clustering.QueryNode, errors.Error) {
impl, ok := getConfigStoreImplementation(z)
if !ok {
return nil, errors.NewAdminConnectionError(nil, z.ConfigurationStoreId())
}
// Check that query node has compatible backend connections:
if n.Standalone().Datastore().URL() != z.DatastoreURI {
return nil, errors.NewWarning(fmt.Sprintf("Failed to add Query Node %v: incompatible datastore with cluster %s", n, z.DatastoreURI))
}
if n.Standalone().ConfigurationStore().URL() != z.ConfigstoreURI {
return nil, errors.NewWarning(fmt.Sprintf("Failed to add Query Node %v: incompatible configstore with cluster %s", n, z.ConfigstoreURI))
}
// Check that query node is version compatible with the cluster:
if !z.Version().Compatible(n.Standalone().Version()) {
return nil, errors.NewWarning(fmt.Sprintf("Failed to add Query Node %v: not version compatible with cluster (%v)", n, z.Version()))
}
qryNodeImpl, ok := n.(*zkQueryNodeConfig)
if !ok {
return nil, errors.NewWarning(fmt.Sprintf("Failed to add Query Node %v: cannot set cluster reference", n))
}
// The query node can be accepted into the cluster - set its cluster reference and name and unset its Standalone:
qryNodeImpl.ClusterRef = z
qryNodeImpl.ClusterName = z.Name()
qryNodeImpl.StandaloneRef = nil
// Add entry for query node: ephemeral node
flags := int32(zk.FlagEphemeral)
acl := zk.WorldACL(zk.PermAll) // TODO: credentials - expose in the API
key := "/" + z.Name() + "/" + n.Name()
value, err := json.Marshal(n)
if err != nil {
return nil, errors.NewAdminEncodingError(err)
}
_, err = impl.conn.Create(key, value, flags, acl)
if err != nil {
return nil, errors.NewAdminAddNodeError(err, "/"+z.Name()+"/"+n.Name())
}
return n, nil
}
func (z *zkCluster) RemoveQueryNode(n clustering.QueryNode) (clustering.QueryNode, errors.Error) {
return z.RemoveQueryNodeByName(n.Name())
}