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manager.go
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manager.go
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package queue
import (
"errors"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/borgenk/qdo/third_party/github.com/syndtr/goleveldb/leveldb"
"github.com/borgenk/qdo/third_party/github.com/syndtr/goleveldb/leveldb/comparer"
"github.com/borgenk/qdo/lib/log"
)
type Manager struct {
Conveyors map[string]*Conveyor
}
var (
manager *Manager
db *leveldb.DB
err error
)
func StartManager(dbFilepath string) error {
manager = &Manager{
Conveyors: make(map[string]*Conveyor),
}
return manager.start(dbFilepath)
}
func (man *Manager) start(dbFilepath string) error {
db, err = leveldb.OpenFile(dbFilepath, nil)
if err != nil {
log.Error(fmt.Sprintf("open database file %s failed", dbFilepath), err)
return err
}
defer db.Close()
storedConveyors, err := getAllStoredConveyors()
if err != nil {
log.Error("", err)
return err
}
for _, v := range storedConveyors {
man.Conveyors[v.ID] = v
go man.Conveyors[v.ID].Init().Start()
}
exit := make(chan os.Signal, 1)
signal.Notify(exit, os.Interrupt, syscall.SIGTERM)
<-exit
return nil
}
func GetConveyor(conveyorID string) (*Conveyor, error) {
if manager == nil {
return nil, errors.New("Manager not initialized")
}
conv, ok := manager.Conveyors[conveyorID]
if !ok {
return nil, nil
}
return conv, nil
}
func getAllStoredConveyors() ([]*Conveyor, error) {
res := make([]*Conveyor, 0, 1000)
start := []byte("c\x00")
iter := db.NewIterator(nil)
for iter.Seek(start); iter.Valid(); iter.Next() {
k := iter.Key()
v := iter.Value()
if comparer.DefaultComparer.Compare(k, []byte("c\xff")) > 0 {
break
}
c := &Conveyor{}
err := GobDecode(v, c)
if err != nil {
panic("for now")
}
res = append(res, c)
}
iter.Release()
return res, nil
}
func GetAllConveyor() ([]*Conveyor, error) {
// TODO: Implement locking.
if manager == nil {
return nil, errors.New("Manager not initialized")
}
res := make([]*Conveyor, 0, len(manager.Conveyors))
for _, v := range manager.Conveyors {
res = append(res, v)
}
return res, nil
}
func AddConveyor(conveyorID string, config *Config) error {
// TODO: Implement locking.
if manager == nil {
return errors.New("Manager not initialized")
}
conv := NewConveyor(conveyorID, config)
manager.Conveyors[conveyorID] = conv
b, err := GobEncode(conv)
if err != nil {
log.Error("", err)
return err
}
err = db.Put(conveyorKey(conveyorID), b, nil)
if err != nil {
log.Error("", err)
return err
}
go func() {
manager.Conveyors[conveyorID].Start()
}()
return nil
}
// RemoveConveyor stops and removes the conveyor. The conveyor will wait on
// running tasks to complete before shutting down.
func RemoveConveyor(conveyorId string) error {
// TODO: Implement locking.
if manager == nil {
return errors.New("Manager not initialized")
}
// Check if conveyor exist.
_, ok := manager.Conveyors[conveyorId]
if !ok {
return errors.New("Conveyor does not exist")
}
err := db.Delete(conveyorKey(conveyorId), nil)
if err != nil {
return err
}
go func() {
manager.Conveyors[conveyorId].Stop()
delete(manager.Conveyors, conveyorId)
}()
return nil
}
func conveyorKey(conveyorId string) []byte {
return []byte(fmt.Sprintf("c\x00%s", conveyorId))
}