/
boltdb.go
151 lines (133 loc) · 3.59 KB
/
boltdb.go
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package boltworker
import (
"bytes"
"encoding/json"
"fmt"
"github.com/boltdb/bolt"
)
type boltDB struct {
fileName string
boltOptions bolt.Options
db *bolt.DB
completedBucket []byte
pendingBucket []byte
failedBucket []byte
}
// NewBoltDB creates a new instance for boltDB used for boltWorker
func NewBoltDB(bo *Options) *boltDB {
b := new(boltDB)
b.fileName = bo.FilePath
b.boltOptions = bo.BoltOptions
b.completedBucket = []byte(bo.CompletedBucket)
b.pendingBucket = []byte(bo.PendingBucket)
b.failedBucket = []byte(bo.FailedBucket)
return b
}
func (b *boltDB) Init() error {
err := b.open()
if err != nil {
return err
}
defer b.close()
// Create necessary buckets if it does not exist
return b.db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists(b.pendingBucket)
if err != nil {
return fmt.Errorf("creating bucket %s failed with error: %s", string(b.pendingBucket), err)
}
_, err = tx.CreateBucketIfNotExists(b.completedBucket)
if err != nil {
return fmt.Errorf("creating bucket %s failed with error: %s", string(b.completedBucket), err)
}
_, err = tx.CreateBucketIfNotExists(b.failedBucket)
if err != nil {
return fmt.Errorf("creating bucket %s failed with error: %s", string(b.failedBucket), err)
}
return nil
})
}
// Update updates the given job in boltDB
func (b *boltDB) Update(job *boltJob) error {
err := b.open()
if err != nil {
return err
}
defer b.close()
if job.Status.HasAll(JobDone) {
err = b._moveFromPendingTo(job, b.completedBucket)
} else if job.Status.HasAny(JobFailed) {
err = b._moveFromPendingTo(job, b.failedBucket)
} else if job.Status.HasAny(JobPending, JobReAttempt) {
err = b._updatePending(job)
} else {
err = fmt.Errorf("job with un-updatable status received: %s", job)
}
return err
}
// GetPendingJobs gets all the jobs in the pending bucket
func (b *boltDB) GetPendingJobs() ([]*boltJob, error) {
jobList := make([]*boltJob, 0)
err := b.open()
if err != nil {
return jobList, err
}
defer b.close()
err = b.forEach(b.pendingBucket, func(k, v []byte) error {
job := new(boltJob)
err := json.Unmarshal(v, job)
if err != nil {
return err
}
jobList = append(jobList, job)
return nil
})
return jobList, err
}
func (b *boltDB) open() error {
var err error
b.db, err = bolt.Open(b.fileName, 0600, &b.boltOptions)
return err
}
func (b *boltDB) close() error {
return b.db.Close()
}
func (b *boltDB) _moveFromPendingTo(job *boltJob, toBucket []byte) error {
if !bytes.Equal(toBucket, b.completedBucket) && !bytes.Equal(toBucket, b.failedBucket) {
return fmt.Errorf("toBucket argument can only contain either of completedBucket or failedBucket")
}
return b.db.Update(func(tx *bolt.Tx) error {
pB := tx.Bucket(b.pendingBucket)
if pB == nil {
return fmt.Errorf("bucket: %s not found", string(b.pendingBucket))
}
err := pB.Delete([]byte(job.Name))
if err != nil {
return err
}
tB := tx.Bucket(toBucket)
if tB == nil {
return fmt.Errorf("bucket: %s not found", string(toBucket))
}
err = tB.Put([]byte(job.Name), []byte(job.String()))
if err != nil {
return err
}
return nil
})
}
func (b *boltDB) _updatePending(job *boltJob) error {
return b.db.Update(func(tx *bolt.Tx) error {
pB := tx.Bucket(b.pendingBucket)
err := pB.Put([]byte(job.Name), []byte(job.String()))
return err
})
}
func (b *boltDB) forEach(bucket []byte, fn func(k, v []byte) error) error {
return b.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
if b != nil {
return b.ForEach(fn)
}
return fmt.Errorf("%s bucket not found", string(bucket))
})
}