/
save.go
47 lines (42 loc) · 1.23 KB
/
save.go
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package state
import (
"fmt"
"crawshaw.io/sqlite/sqlitex"
)
// Save is implemented in the same way for all types but without generics this
// code just has to be duplicated. Putting them in the same file ensures
// consistency.
// Save the current state of the chain and the database that can be rolled back
// to if the returned closure is called with a non-nil error.
func (chain *FactomChain) Save() func(err *error) {
rollback := sqlitex.Save(chain.Conn)
chainCopy := *chain
return func(err *error) {
if *err != nil {
// Reset chain on any error
var alwaysRollbackErr = fmt.Errorf("always rollback")
rollback(&alwaysRollbackErr)
*chain = chainCopy
return
}
// *err == nil, commit all changes
rollback(err)
}
}
// Save the current state of the chain and the database that can be rolled back
// to if the returned closure is called with a non-nil error.
func (chain *FATChain) Save() func(err *error) {
rollback := sqlitex.Save(chain.Conn)
chainCopy := *chain
return func(err *error) {
if *err != nil {
// Reset chain on any error
var alwaysRollbackErr = fmt.Errorf("always rollback")
rollback(&alwaysRollbackErr)
*chain = chainCopy
return
}
// *err == nil, commit all changes
rollback(err)
}
}