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tasks.go
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tasks.go
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package store
import (
"strconv"
"strings"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/manager/state"
memdb "github.com/hashicorp/go-memdb"
)
const tableTask = "task"
func init() {
register(ObjectStoreConfig{
Name: tableTask,
Table: &memdb.TableSchema{
Name: tableTask,
Indexes: map[string]*memdb.IndexSchema{
indexID: {
Name: indexID,
Unique: true,
Indexer: taskIndexerByID{},
},
indexName: {
Name: indexName,
AllowMissing: true,
Indexer: taskIndexerByName{},
},
indexServiceID: {
Name: indexServiceID,
AllowMissing: true,
Indexer: taskIndexerByServiceID{},
},
indexNodeID: {
Name: indexNodeID,
AllowMissing: true,
Indexer: taskIndexerByNodeID{},
},
indexSlot: {
Name: indexSlot,
AllowMissing: true,
Indexer: taskIndexerBySlot{},
},
indexDesiredState: {
Name: indexDesiredState,
Indexer: taskIndexerByDesiredState{},
},
},
},
Save: func(tx ReadTx, snapshot *api.StoreSnapshot) error {
var err error
snapshot.Tasks, err = FindTasks(tx, All)
return err
},
Restore: func(tx Tx, snapshot *api.StoreSnapshot) error {
tasks, err := FindTasks(tx, All)
if err != nil {
return err
}
for _, t := range tasks {
if err := DeleteTask(tx, t.ID); err != nil {
return err
}
}
for _, t := range snapshot.Tasks {
if err := CreateTask(tx, t); err != nil {
return err
}
}
return nil
},
ApplyStoreAction: func(tx Tx, sa *api.StoreAction) error {
switch v := sa.Target.(type) {
case *api.StoreAction_Task:
obj := v.Task
switch sa.Action {
case api.StoreActionKindCreate:
return CreateTask(tx, obj)
case api.StoreActionKindUpdate:
return UpdateTask(tx, obj)
case api.StoreActionKindRemove:
return DeleteTask(tx, obj.ID)
}
}
return errUnknownStoreAction
},
NewStoreAction: func(c state.Event) (api.StoreAction, error) {
var sa api.StoreAction
switch v := c.(type) {
case state.EventCreateTask:
sa.Action = api.StoreActionKindCreate
sa.Target = &api.StoreAction_Task{
Task: v.Task,
}
case state.EventUpdateTask:
sa.Action = api.StoreActionKindUpdate
sa.Target = &api.StoreAction_Task{
Task: v.Task,
}
case state.EventDeleteTask:
sa.Action = api.StoreActionKindRemove
sa.Target = &api.StoreAction_Task{
Task: v.Task,
}
default:
return api.StoreAction{}, errUnknownStoreAction
}
return sa, nil
},
})
}
type taskEntry struct {
*api.Task
}
func (t taskEntry) ID() string {
return t.Task.ID
}
func (t taskEntry) Meta() api.Meta {
return t.Task.Meta
}
func (t taskEntry) SetMeta(meta api.Meta) {
t.Task.Meta = meta
}
func (t taskEntry) Copy() Object {
return taskEntry{t.Task.Copy()}
}
func (t taskEntry) EventCreate() state.Event {
return state.EventCreateTask{Task: t.Task}
}
func (t taskEntry) EventUpdate() state.Event {
return state.EventUpdateTask{Task: t.Task}
}
func (t taskEntry) EventDelete() state.Event {
return state.EventDeleteTask{Task: t.Task}
}
// CreateTask adds a new task to the store.
// Returns ErrExist if the ID is already taken.
func CreateTask(tx Tx, t *api.Task) error {
return tx.create(tableTask, taskEntry{t})
}
// UpdateTask updates an existing task in the store.
// Returns ErrNotExist if the node doesn't exist.
func UpdateTask(tx Tx, t *api.Task) error {
return tx.update(tableTask, taskEntry{t})
}
// DeleteTask removes a task from the store.
// Returns ErrNotExist if the task doesn't exist.
func DeleteTask(tx Tx, id string) error {
return tx.delete(tableTask, id)
}
// GetTask looks up a task by ID.
// Returns nil if the task doesn't exist.
func GetTask(tx ReadTx, id string) *api.Task {
t := tx.get(tableTask, id)
if t == nil {
return nil
}
return t.(taskEntry).Task
}
// FindTasks selects a set of tasks and returns them.
func FindTasks(tx ReadTx, by By) ([]*api.Task, error) {
checkType := func(by By) error {
switch by.(type) {
case byName, byNamePrefix, byIDPrefix, byDesiredState, byNode, byService, bySlot:
return nil
default:
return ErrInvalidFindBy
}
}
taskList := []*api.Task{}
appendResult := func(o Object) {
taskList = append(taskList, o.(taskEntry).Task)
}
err := tx.find(tableTask, by, checkType, appendResult)
return taskList, err
}
type taskIndexerByID struct{}
func (ti taskIndexerByID) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ti taskIndexerByID) FromObject(obj interface{}) (bool, []byte, error) {
t, ok := obj.(taskEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
val := t.Task.ID + "\x00"
return true, []byte(val), nil
}
func (ti taskIndexerByID) PrefixFromArgs(args ...interface{}) ([]byte, error) {
return prefixFromArgs(args...)
}
type taskIndexerByName struct{}
func (ti taskIndexerByName) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ti taskIndexerByName) FromObject(obj interface{}) (bool, []byte, error) {
t, ok := obj.(taskEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
return true, []byte(strings.ToLower(t.ServiceAnnotations.Name) + "\x00"), nil
}
func (ti taskIndexerByName) PrefixFromArgs(args ...interface{}) ([]byte, error) {
return prefixFromArgs(args...)
}
type taskIndexerByServiceID struct{}
func (ti taskIndexerByServiceID) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ti taskIndexerByServiceID) FromObject(obj interface{}) (bool, []byte, error) {
t, ok := obj.(taskEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
val := t.ServiceID + "\x00"
return true, []byte(val), nil
}
type taskIndexerByNodeID struct{}
func (ti taskIndexerByNodeID) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ti taskIndexerByNodeID) FromObject(obj interface{}) (bool, []byte, error) {
t, ok := obj.(taskEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
val := t.NodeID + "\x00"
return true, []byte(val), nil
}
type taskIndexerBySlot struct{}
func (ti taskIndexerBySlot) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ti taskIndexerBySlot) FromObject(obj interface{}) (bool, []byte, error) {
t, ok := obj.(taskEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
val := t.ServiceID + "\x00" + strconv.FormatUint(t.Slot, 10) + "\x00"
return true, []byte(val), nil
}
type taskIndexerByDesiredState struct{}
func (ni taskIndexerByDesiredState) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (ni taskIndexerByDesiredState) FromObject(obj interface{}) (bool, []byte, error) {
n, ok := obj.(taskEntry)
if !ok {
panic("unexpected type passed to FromObject")
}
// Add the null character as a terminator
return true, []byte(strconv.FormatInt(int64(n.DesiredState), 10) + "\x00"), nil
}