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flexlock.go
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flexlock.go
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package dblock
import (
"fmt"
"sync"
"github.com/ariefdarmawan/sharedobject"
"github.com/eaciit/toolkit"
"git.eaciitapp.com/sebar/dbflex"
)
type FlexLock struct {
connFn func() (dbflex.IConnection, error)
//lock *sync.RWMutex
deps []*FK
locks *sharedobject.SharedData
}
func (l *FlexLock) SetDeps(deps []*FK) *FlexLock {
l.deps = deps
return l
}
func (l *FlexLock) getLock(name string) *sync.RWMutex {
if l.locks == nil {
l.locks = sharedobject.NewSharedData()
}
if lock := l.locks.Get(name); lock == nil {
lockMutex := new(sync.RWMutex)
l.locks.Set(name, lockMutex)
return lockMutex
} else {
return lock.(*sync.RWMutex)
}
}
func (l *FlexLock) ValidateChild(name string, data interface{}, en ExistsNotExists) error {
mdata, err := toolkit.ToM(data)
if err != nil {
return fmt.Errorf("unable to serialize data. %s", err.Error())
}
relevantDeps := []*FK{}
for _, dep := range l.deps {
if dep.Table2 == name {
relevantDeps = append(relevantDeps, dep)
}
}
for _, dep := range relevantDeps {
depError := func() error {
conn, err := l.connFn()
if err != nil {
return fmt.Errorf("unable to connect. %s", err.Error())
}
defer conn.Close()
filter := dep.WhereT1(mdata)
query := dbflex.From(dep.Table1).Where(filter).Select().Take(1)
cursor := conn.Cursor(query, nil)
if cursor.Error() != nil {
return fmt.Errorf("unable to create cursor. %s", err.Error())
}
ms := []toolkit.M{}
if err = cursor.Fetchs(&ms, 0); err != nil {
return fmt.Errorf("unable to fetch cursor. %s", err.Error())
}
if len(ms) == 0 {
if en != NotExists {
return fmt.Errorf("data exists on %s", dep.Table1)
}
} else {
if en != Exists {
return fmt.Errorf("data not exists on %s", dep.Table1)
}
}
return nil
}()
if depError != nil {
return depError
}
}
return nil
}
func (l *FlexLock) ValidateParent(name string, data interface{}, en ExistsNotExists) error {
mdata, err := toolkit.ToM(data)
if err != nil {
return fmt.Errorf("unable to serialize data. %s", err.Error())
}
relevantDeps := []*FK{}
for _, dep := range l.deps {
if dep.Table1 == name {
relevantDeps = append(relevantDeps, dep)
}
}
for _, dep := range relevantDeps {
depError := func() error {
conn, err := l.connFn()
if err != nil {
return fmt.Errorf("unable to connect. %s", err.Error())
}
defer conn.Close()
filter := dep.WhereT2(mdata)
query := dbflex.From(dep.Table2).Where(filter).Select().Take(1)
cursor := conn.Cursor(query, nil)
if cursor.Error() != nil {
return fmt.Errorf("unable to create cursor. %s: %s", dep.Table2, err.Error())
}
ms := []toolkit.M{}
if err = cursor.Fetchs(&ms, 0); err != nil {
if err.Error() != "EOF" {
return fmt.Errorf("unable to fetch cursor. %s: %s", dep.Table2, err.Error())
}
}
if en == Exists && len(ms) == 0 {
return fmt.Errorf("data is not exists on %s with filter %s", dep.Table2, toolkit.JsonString(filter))
} else if en == NotExists && len(ms) > 0 {
return fmt.Errorf("data is exists on %s with filter %s", dep.Table2, toolkit.JsonString(filter))
}
return nil
}()
if depError != nil {
return depError
}
}
return nil
}
func (l *FlexLock) Save(name string, data ...interface{}) error {
for _, d := range data {
dErr := func() error {
err := l.ValidateParent(name, d, Exists)
if err != nil {
return fmt.Errorf("Data consistency error. %s", err.Error())
}
querySave := dbflex.From(name).Save()
connSave, err := l.connFn()
if err != nil {
return fmt.Errorf("unable to save. connection fail. %s", err.Error())
}
defer connSave.Close()
if _, err = connSave.Execute(querySave, toolkit.M{}.Set("data", d)); err != nil {
return fmt.Errorf("unable to save. connection fail. %s", err.Error())
}
return nil
}()
if dErr != nil {
return dErr
}
}
return nil
}
func (l *FlexLock) Delete(name string, where *dbflex.Filter) error {
conn, err := l.connFn()
if err != nil {
return fmt.Errorf("unable to delete. connection fail. %s", err.Error())
}
defer conn.Close()
//-- get items to be deleted
cursor := conn.Cursor(dbflex.From(name).Where(where), nil)
if cursor.Error() != nil {
return fmt.Errorf("unable to get cursor for deleted items. %s", err.Error())
}
ms := []toolkit.M{}
if err = cursor.Fetchs(&ms, 0); err != nil && err.Error() != "EOF" {
return fmt.Errorf("unable to fetch cursor of deleted items. %s", err.Error())
}
for _, m := range ms {
err := l.ValidateChild(name, m, NotExists)
if err != nil {
return fmt.Errorf("data consistency error. %s", err.Error())
}
}
query := dbflex.From(name).Where(where).Delete()
if _, err = conn.Execute(query, nil); err != nil {
return fmt.Errorf("unable to delete. connection fail. %s", err.Error())
}
return nil
}
/*
func (l *FlexLock) Execute(cmd dbflex.ICommand, parm toolkit.M) error {
if l.connFn == nil {
return fmt.Errorf("connection is not yet implemented")
}
conn, err := l.connFn()
if err != nil {
return fmt.Errorf("connection error. %s", err.Error())
}
defer conn.Close()
l.lock.Lock()
_, err = conn.Execute(cmd, parm)
l.lock.Unlock()
return err
}
func (l *FlexLock) Cursor(cmd dbflex.ICommand, parm toolkit.M) (dbflex.ICursor, error) {
if l.connFn == nil {
return nil, fmt.Errorf("connection is not yet implemented")
}
conn, err := l.connFn()
if err != nil {
return nil, fmt.Errorf("connection error. %s", err.Error())
}
defer conn.Close()
l.lock.RLock()
cur := conn.Cursor(cmd, parm)
err = cur.Error()
if err != nil {
return nil, err
}
l.lock.Unlock()
return cur, nil
}
*/