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tx.go
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tx.go
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package transaction
import (
dbbadger "github.com/dgraph-io/badger/v2"
ioutils "github.com/onflow/flow-go/utils/io"
)
type Tx struct {
DBTxn *dbbadger.Txn
callbacks []func()
}
// OnSucceed adds a callback to execute after the batch has
// been successfully flushed.
// useful for implementing the cache where we will only cache
// after the batch has been successfully flushed
func (b *Tx) OnSucceed(callback func()) {
b.callbacks = append(b.callbacks, callback)
}
// Update creates a badger transaction, passing it to a chain of functions,
// if all succeed. Useful to use callback to update cache in order to ensure data
// in badgerDB and cache are consistent.
func Update(db *dbbadger.DB, f func(*Tx) error) error {
dbTxn := db.NewTransaction(true)
defer dbTxn.Discard()
tx := &Tx{DBTxn: dbTxn}
err := f(tx)
if err != nil {
return err
}
err = dbTxn.Commit()
if err != nil {
return ioutils.TerminateOnFullDisk(err)
}
for _, callback := range tx.callbacks {
callback()
}
return nil
}
// WithTx is useful when transaction is used without adding callback.
func WithTx(f func(*dbbadger.Txn) error) func(*Tx) error {
return func(tx *Tx) error {
return f(tx.DBTxn)
}
}