docker/swarmkit

package store

import (
    "strconv"
    "strings"

    memdb "github.com/hashicorp/go-memdb"
    "github.com/moby/swarmkit/v2/api"
)

const tableNode = "node"

func init() {
    register(ObjectStoreConfig{
        Table: &memdb.TableSchema{
            Name: tableNode,
            Indexes: map[string]*memdb.IndexSchema{
                indexID: {
                    Name:    indexID,
                    Unique:  true,
                    Indexer: api.NodeIndexerByID{},
                },
                // TODO(aluzzardi): Use `indexHostname` instead.
                indexName: {
                    Name:         indexName,
                    AllowMissing: true,
                    Indexer:      nodeIndexerByHostname{},
                },
                indexRole: {
                    Name:    indexRole,
                    Indexer: nodeIndexerByRole{},
                },
                indexMembership: {
                    Name:    indexMembership,
                    Indexer: nodeIndexerByMembership{},
                },
                indexCustom: {
                    Name:         indexCustom,
                    Indexer:      api.NodeCustomIndexer{},
                    AllowMissing: true,
                },
            },
        },
        Save: func(tx ReadTx, snapshot *api.StoreSnapshot) error {
            var err error
            snapshot.Nodes, err = FindNodes(tx, All)
            return err
        },
        Restore: func(tx Tx, snapshot *api.StoreSnapshot) error {
            toStoreObj := make([]api.StoreObject, len(snapshot.Nodes))
            for i, x := range snapshot.Nodes {
                toStoreObj[i] = x
            }
            return RestoreTable(tx, tableNode, toStoreObj)
        },
        ApplyStoreAction: func(tx Tx, sa api.StoreAction) error {
            switch v := sa.Target.(type) {
            case *api.StoreAction_Node:
                obj := v.Node
                switch sa.Action {
                case api.StoreActionKindCreate:
                    return CreateNode(tx, obj)
                case api.StoreActionKindUpdate:
                    return UpdateNode(tx, obj)
                case api.StoreActionKindRemove:
                    return DeleteNode(tx, obj.ID)
                }
            }
            return errUnknownStoreAction
        },
    })
}

// CreateNode adds a new node to the store.
// Returns ErrExist if the ID is already taken.
func CreateNode(tx Tx, n *api.Node) error {
    return tx.create(tableNode, n)
}

// UpdateNode updates an existing node in the store.
// Returns ErrNotExist if the node doesn't exist.
func UpdateNode(tx Tx, n *api.Node) error {
    return tx.update(tableNode, n)
}

// DeleteNode removes a node from the store.
// Returns ErrNotExist if the node doesn't exist.
func DeleteNode(tx Tx, id string) error {
    return tx.delete(tableNode, id)
}

// GetNode looks up a node by ID.
// Returns nil if the node doesn't exist.
func GetNode(tx ReadTx, id string) *api.Node {
    n := tx.get(tableNode, id)
    if n == nil {
        return nil
    }
    return n.(*api.Node)
}

// FindNodes selects a set of nodes and returns them.
func FindNodes(tx ReadTx, by By) ([]*api.Node, error) {
    checkType := func(by By) error {
        switch by.(type) {
        case byName, byNamePrefix, byIDPrefix, byRole, byMembership, byCustom, byCustomPrefix:
            return nil
        default:
            return ErrInvalidFindBy
        }
    }

    nodeList := []*api.Node{}
    appendResult := func(o api.StoreObject) {
        nodeList = append(nodeList, o.(*api.Node))
    }

    err := tx.find(tableNode, by, checkType, appendResult)
    return nodeList, err
}

type nodeIndexerByHostname struct{}

func (ni nodeIndexerByHostname) FromArgs(args ...interface{}) ([]byte, error) {
    return fromArgs(args...)
}

func (ni nodeIndexerByHostname) FromObject(obj interface{}) (bool, []byte, error) {
    n := obj.(*api.Node)

    if n.Description == nil {
        return false, nil, nil
    }
    // Add the null character as a terminator
    return true, []byte(strings.ToLower(n.Description.Hostname) + "\x00"), nil
}

func (ni nodeIndexerByHostname) PrefixFromArgs(args ...interface{}) ([]byte, error) {
    return prefixFromArgs(args...)
}

type nodeIndexerByRole struct{}

func (ni nodeIndexerByRole) FromArgs(args ...interface{}) ([]byte, error) {
    return fromArgs(args...)
}

func (ni nodeIndexerByRole) FromObject(obj interface{}) (bool, []byte, error) {
    n := obj.(*api.Node)

    // Add the null character as a terminator
    return true, []byte(strconv.FormatInt(int64(n.Role), 10) + "\x00"), nil
}

type nodeIndexerByMembership struct{}

func (ni nodeIndexerByMembership) FromArgs(args ...interface{}) ([]byte, error) {
    return fromArgs(args...)
}

func (ni nodeIndexerByMembership) FromObject(obj interface{}) (bool, []byte, error) {
    n := obj.(*api.Node)

    // Add the null character as a terminator
    return true, []byte(strconv.FormatInt(int64(n.Spec.Membership), 10) + "\x00"), nil
}