/
job.go
121 lines (103 loc) · 2.18 KB
/
job.go
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package models
import (
"context"
"errors"
"fmt"
"github.com/dgraph-io/badger/v3"
protobuf "github.com/golang/protobuf/proto"
"github.com/google/uuid"
)
var JobDone = errors.New("job done")
func NewJob(ty JobType, pb protobuf.Message) *Job {
bs, err := protobuf.Marshal(pb)
if err != nil {
panic(fmt.Errorf("protobuf marshal: %v", err))
}
j := &Job{
Id: uuid.NewString(),
Type: ty,
Content: bs,
}
return j
}
func NewJobFromBytes(bs []byte) *Job {
j := &Job{}
err := protobuf.Unmarshal(bs, j)
if err != nil {
panic("invalid task")
}
return j
}
func (d *DB) InsertJob(j *Job) error {
txn := d.db.NewTransaction(true)
defer txn.Discard()
bs, err := protobuf.Marshal(j)
if err != nil {
return err
}
err = txn.Set(JobKey(j.Id), bs)
if err != nil {
return err
}
return txn.Commit()
}
func (d *DB) ListJobs() {
panic("implement me")
}
func (d *DB) GetJob(ctx context.Context, jobId string) (j *Job, err error) {
txn := d.db.NewTransaction(false)
defer txn.Discard()
item, err := txn.Get(JobKey(jobId))
if err != nil {
// handle not found error manually
if errors.Is(err, badger.ErrKeyNotFound) {
return nil, NewNotFoundErr(jobId)
}
return nil, err
}
err = item.Value(func(val []byte) error {
j = NewJobFromBytes(val)
return nil
})
return
}
func (d *DB) SubscribeJob(ctx context.Context, fn func(j *Job)) (err error) {
return d.db.Subscribe(ctx, func(kv *badger.KVList) error {
for _, v := range kv.Kv {
j := NewJobFromBytes(v.Value)
fn(j)
}
return nil
}, JobPrefix)
}
func (d *DB) DeleteJob(ctx context.Context, jobId string) (err error) {
txn := d.db.NewTransaction(true)
defer txn.Discard()
err = txn.Delete(JobKey(jobId))
if err != nil {
return
}
return
}
func (d *DB) WaitJob(ctx context.Context, jobId string) (err error) {
_, err = d.GetJob(ctx, jobId)
// If job doesn't exist, we can return directly.
if err != nil && errors.Is(err, ErrNotFound) {
return nil
}
if err != nil {
return
}
err = d.db.Subscribe(ctx, func(kv *badger.KVList) error {
for _, v := range kv.Kv {
if v.Value == nil {
return JobDone
}
}
return nil
}, JobKey(jobId))
if err == JobDone {
return nil
}
return err
}