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job_check_by_buntdb.go
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/
job_check_by_buntdb.go
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package main
import (
"github.com/tidwall/buntdb"
)
type JobCheckByBuntDB struct {
File string
Prefix string
}
func (jc *JobCheckByBuntDB) Check(job_id string, ack func() error, f func() error) error {
skip := false
key := jc.Prefix + job_id
err := jc.Open(func(tx *buntdb.Tx) error {
jobStatus, err := jc.GetStatus(tx, key)
if err != nil {
return err
}
if jobStatus != "" {
skip = true
log.Infof("Job %q is %s. So it will be skipped.\n", key, jobStatus)
err := ack()
if err != nil {
log.Warningf("Failed to send ACK to skip Job %q.\n", key)
}
return nil
}
err = jc.SetStatus(tx, key, "executing", log.Errorf)
if err != nil {
return err
}
return nil
})
if err != nil {
return err
}
if skip {
return nil
}
err = f()
return jc.Open(func(tx *buntdb.Tx) error {
if err != nil {
jc.SetStatus(tx, key, "error", log.Warningf)
return err
}
jc.SetStatus(tx, key, "completed", log.Warningf)
return nil
})
}
func (jc *JobCheckByBuntDB) Open(f func(tx *buntdb.Tx) error) error {
// Open the data.db file. It will be created if it doesn't exist.
db, err := buntdb.Open(jc.File)
if err != nil {
log.Fatal(err)
}
defer db.Close()
return db.Update(f)
}
func (jc *JobCheckByBuntDB) GetStatus(tx *buntdb.Tx, key string) (string, error) {
val, err := tx.Get(key)
if err == buntdb.ErrNotFound {
return "", nil
}
if err != nil {
log.Errorf("Failed to get value for %s because of %v\n", key, err)
return "", err
}
return val, nil
}
func (jc *JobCheckByBuntDB) SetStatus(tx *buntdb.Tx, key, value string, logMethod func(string, ...interface{})) error {
_, _, err := tx.Set(key, value, nil)
if err != nil {
logMethod("Failed to get value for %s because of %v\n", key, err)
return err
}
return nil
}