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nodes.go
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nodes.go
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package store
import (
"strconv"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/manager/state"
memdb "github.com/hashicorp/go-memdb"
)
const tableNode = "node"
func init() {
register(ObjectStoreConfig{
Name: tableNode,
Table: &memdb.TableSchema{
Name: tableNode,
Indexes: map[string]*memdb.IndexSchema{
indexID: {
Name: indexID,
Unique: true,
Indexer: nodeIndexerByID{},
},
// TODO(aluzzardi): Use `indexHostname` instead.
indexName: {
Name: indexName,
AllowMissing: true,
Indexer: nodeIndexerByHostname{},
},
indexRole: {
Name: indexRole,
Indexer: nodeIndexerByRole{},
},
indexMembership: {
Name: indexMembership,
Indexer: nodeIndexerByMembership{},
},
},
},
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 {
nodes, err := FindNodes(tx, All)
if err != nil {
return err
}
for _, n := range nodes {
if err := DeleteNode(tx, n.ID); err != nil {
return err
}
}
for _, n := range snapshot.Nodes {
if err := CreateNode(tx, n); err != nil {
return err
}
}
return nil
},
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
},
NewStoreAction: func(c state.Event) (api.StoreAction, error) {
var sa api.StoreAction
switch v := c.(type) {
case state.EventCreateNode:
sa.Action = api.StoreActionKindCreate
sa.Target = &api.StoreAction_Node{
Node: v.Node,
}
case state.EventUpdateNode:
sa.Action = api.StoreActionKindUpdate
sa.Target = &api.StoreAction_Node{
Node: v.Node,
}
case state.EventDeleteNode:
sa.Action = api.StoreActionKindRemove
sa.Target = &api.StoreAction_Node{
Node: v.Node,
}
default:
return api.StoreAction{}, errUnknownStoreAction
}
return sa, nil
},
})
}
type nodeEntry struct {
*api.Node
}
func (n nodeEntry) ID() string {
return n.Node.ID
}
func (n nodeEntry) Meta() api.Meta {
return n.Node.Meta
}
func (n nodeEntry) SetMeta(meta api.Meta) {
n.Node.Meta = meta
}
func (n nodeEntry) Copy() Object {
return nodeEntry{n.Node.Copy()}
}
func (n nodeEntry) EventCreate() state.Event {
return state.EventCreateNode{Node: n.Node}
}
func (n nodeEntry) EventUpdate() state.Event {
return state.EventUpdateNode{Node: n.Node}
}
func (n nodeEntry) EventDelete() state.Event {
return state.EventDeleteNode{Node: n.Node}
}
// 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, nodeEntry{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, nodeEntry{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.(nodeEntry).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, byIDPrefix, byRole, byMembership:
return nil
default:
return ErrInvalidFindBy
}
}
nodeList := []*api.Node{}
appendResult := func(o Object) {
nodeList = append(nodeList, o.(nodeEntry).Node)
}
err := tx.find(tableNode, by, checkType, appendResult)
return nodeList, err
}
type nodeIndexerByID struct{}
func (ni nodeIndexerByID) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ni nodeIndexerByID) FromObject(obj interface{}) (bool, []byte, error) {
n, ok := obj.(nodeEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
val := n.Node.ID + "\x00"
return true, []byte(val), nil
}
func (ni nodeIndexerByID) PrefixFromArgs(args ...interface{}) ([]byte, error) {
return prefixFromArgs(args...)
}
type nodeIndexerByHostname struct{}
func (ni nodeIndexerByHostname) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ni nodeIndexerByHostname) FromObject(obj interface{}) (bool, []byte, error) {
n, ok := obj.(nodeEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
if n.Description == nil {
return false, nil, nil
}
// Add the null character as a terminator
return true, []byte(n.Description.Hostname + "\x00"), nil
}
type nodeIndexerByRole struct{}
func (ni nodeIndexerByRole) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ni nodeIndexerByRole) FromObject(obj interface{}) (bool, []byte, error) {
n, ok := obj.(nodeEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
return true, []byte(strconv.FormatInt(int64(n.Spec.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, ok := obj.(nodeEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
return true, []byte(strconv.FormatInt(int64(n.Spec.Membership), 10) + "\x00"), nil
}