// DelQuery will delete (from datastore and memcache) all entities of type src that matches q.
// src must be a pointer to a struct type.
func DelQuery(c PersistenceContext, src interface{}, q *datastore.Query) (err error) {
var dataIds []*datastore.Key
results := reflect.New(reflect.SliceOf(reflect.TypeOf(src).Elem()))
dataIds, err = q.GetAll(c, results.Interface())
if err = FilterOkErrors(err); err != nil {
return
}
memcacheKeys := []string{}
var el reflect.Value
resultsSlice := results.Elem()
for index, dataId := range dataIds {
el = resultsSlice.Index(index)
var k key.Key
if k, err = gaekey.FromGAE(dataId); err != nil {
return
}
el.FieldByName("Id").Set(reflect.ValueOf(k))
if _, err = MemcacheKeys(c, el.Addr().Interface(), &memcacheKeys); err != nil {
return
}
if err = runProcess(c, el.Addr().Interface(), BeforeDeleteName, nil); err != nil {
return
}
}
if err = datastore.DeleteMulti(c, dataIds); err != nil {
return
}
for index, _ := range dataIds {
el = resultsSlice.Index(index)
if err = runProcess(c, el.Addr().Interface(), AfterDeleteName, nil); err != nil {
return
}
}
return memcache.Del(c, memcacheKeys...)
}
func MemcacheDel(c PersistenceContext, model interface{}) (err error) {
var keys []string
if keys, err = MemcacheKeys(c, model, nil); err != nil {
return
}
return memcache.Del(c, keys...)
}
func (self *Mutex) Unlock(c gaecontext.GAEContext) (err error) {
if err = datastore.Delete(c, lockIdForName(c, self.Name)); err != nil {
return
}
err = memcache.Del(c, lockKeyForName(self.Name))
return
}
func testMemcacheBasics(c gaecontext.HTTPContext) {
if err := memcache.Del(c, "s"); err != nil {
panic(err)
}
s := ""
if _, err := memcache.Get(c, "s", &s); err != nil {
panic(err)
}
if s != "" {
panic(fmt.Errorf("Wrong value"))
}
if success, err := memcache.CAS(c, "s", "x", "y"); err != nil {
panic(err)
} else if success {
panic(fmt.Errorf("Shouldn't succeed"))
}
s = "x"
if err := memcache.Put(c, "s", s); err != nil {
panic(err)
}
s2 := ""
if _, err := memcache.Get(c, "s", &s2); err != nil {
panic(err)
}
if s2 != "x" {
panic(fmt.Errorf("Wrong value"))
}
if success, err := memcache.CAS(c, "s", "z", "y"); err != nil {
panic(err)
} else if success {
panic(fmt.Errorf("Shouldn't succeed"))
}
if success, err := memcache.CAS(c, "s", "x", "y"); err != nil {
panic(err)
} else if !success {
panic(fmt.Errorf("Should have succeeded"))
}
s3 := ""
if _, err := memcache.Get(c, "s", &s3); err != nil {
panic(err)
}
if s3 != "y" {
panic(fmt.Errorf("Wrong value"))
}
}
/*
Del will delete src from datastore and invalidate it from memcache.
It will also load any old entities with the same id from datastore
and run Before/AfterDelete on them
*/
func Del(c PersistenceContext, src interface{}) (err error) {
var typ reflect.Type
var id key.Key
if typ, id, err = getTypeAndId(src); err != nil {
return
}
if id == "" {
err = errors.Errorf("%+v doesn't have an Id", src)
return
}
gaeKey := gaekey.ToGAE(c, id)
if !gaeKey.Incomplete() {
old := reflect.New(typ)
old.Elem().FieldByName(idFieldName).Set(reflect.ValueOf(id))
err = GetById(c, old.Interface())
if _, ok := err.(ErrNoSuchEntity); ok {
err = nil
} else if err == nil {
if err = runProcess(c, old.Interface(), BeforeDeleteName, nil); err != nil {
return
}
if err = datastore.Delete(c, gaeKey); err != nil {
return
}
memKeys := []string{}
if memKeys, err = MemcacheKeys(c, old.Interface(), nil); err != nil {
return
}
if err = memcache.Del(c, memKeys...); err != nil {
return
}
}
if err = runProcess(c, old.Interface(), AfterDeleteName, nil); err != nil {
return
}
}
return
}
/*
Put will save src in datastore, invalidating cache and running hooks.
This requires the loading of any old versions currently in the datastore, which will
cause some extra work.
*/
func Put(c PersistenceContext, src interface{}) (err error) {
var id key.Key
if _, id, err = getTypeAndId(src); err != nil {
return
}
if id == "" {
err = errors.Errorf("%+v doesn't have an Id", src)
return
}
gaeKey := gaekey.ToGAE(c, id)
memcacheKeys := []string{}
var oldIf interface{}
if !gaeKey.Incomplete() {
old := reflect.New(reflect.TypeOf(src).Elem())
old.Elem().FieldByName(idFieldName).Set(reflect.ValueOf(id))
err = GetById(c, old.Interface())
if _, ok := err.(ErrNoSuchEntity); ok {
err = nil
} else if err == nil {
oldIf = old.Interface()
if _, err = MemcacheKeys(c, oldIf, &memcacheKeys); err != nil {
return
}
} else {
return
}
}
if oldIf == nil {
if err = runProcess(c, src, BeforeCreateName, nil); err != nil {
return
}
} else {
if err = runProcess(c, src, BeforeUpdateName, oldIf); err != nil {
return
}
}
if err = runProcess(c, src, BeforeSaveName, oldIf); err != nil {
return
}
if err = runProcess(c, src, ValidateName, nil); err != nil {
return
}
if id, err = gaekey.FromGAErr(datastore.Put(c, gaeKey, src)); err != nil {
return
}
reflect.ValueOf(src).Elem().FieldByName(idFieldName).Set(reflect.ValueOf(id))
if _, err = MemcacheKeys(c, src, &memcacheKeys); err != nil {
return
}
if err = memcache.Del(c, memcacheKeys...); err != nil {
return
}
if oldIf == nil {
if err = runProcess(c, src, AfterCreateName, nil); err != nil {
return
}
} else {
if err = runProcess(c, src, AfterUpdateName, oldIf); err != nil {
return
}
}
return runProcess(c, src, AfterSaveName, oldIf)
}
/*
PutMulti will save src in datastore, invalidating cache and running hooks.
This requires the loading of any old versions currently in the datastore, which will
cause some extra work.
*/
func PutMulti(c PersistenceContext, src interface{}) (err error) {
// validate
srcVal := reflect.ValueOf(src)
if srcVal.Kind() != reflect.Slice {
err = errors.Errorf("%+v is not a slice", src)
return
}
if srcVal.Type().Elem().Kind() != reflect.Ptr {
err = errors.Errorf("%+v is not a slice of pointers", src)
return
}
if srcVal.Type().Elem().Elem().Kind() != reflect.Struct {
err = errors.Errorf("%+v is not a slice of struct pointers", src)
return
}
// build required data for loading old entities
gaeKeys := make([]*datastore.Key, srcVal.Len())
ids := make([]key.Key, srcVal.Len())
keysToLoad := []*datastore.Key{}
indexMapping := []int{}
for i := 0; i < srcVal.Len(); i++ {
var id key.Key
if _, id, err = getTypeAndId(srcVal.Index(i).Interface()); err != nil {
return
}
if id == "" {
err = errors.Errorf("%+v doesn't have an id", srcVal.Index(i))
return
}
ids[i] = id
gaeKey := gaekey.ToGAE(c, id)
gaeKeys[i] = gaeKey
if !gaeKey.Incomplete() {
keysToLoad = append(keysToLoad, gaeKey)
indexMapping = append(indexMapping, i)
}
}
// load old entities
memcacheKeys := []string{}
oldIfs := make([]interface{}, srcVal.Len())
if len(keysToLoad) > 0 {
oldEntities := reflect.MakeSlice(reflect.SliceOf(srcVal.Type().Elem().Elem()), len(keysToLoad), len(keysToLoad))
getErr := datastore.GetMulti(c, keysToLoad, oldEntities.Interface())
// check which entities weren't in the database
notFound := make([]bool, len(keysToLoad))
if getErr != nil {
if multiErr, ok := getErr.(appengine.MultiError); ok {
for index, e := range multiErr {
if e == datastore.ErrNoSuchEntity {
notFound[index] = true
} else {
err = e
return
}
}
} else {
err = getErr
return
}
}
// put entities inside oldIfs, run AfterLoad, add memcache keys from the old entities
for index, _ := range keysToLoad {
if !notFound[index] {
if idField := oldEntities.Index(index).FieldByName(idFieldName); idField.IsValid() {
idField.Set(reflect.ValueOf(ids[indexMapping[index]]))
}
oldIf := oldEntities.Index(index).Addr().Interface()
oldIfs[indexMapping[index]] = oldIf
if err = runProcess(c, oldIf, AfterLoadName, nil); err != nil {
return
}
if _, err = MemcacheKeys(c, oldIf, &memcacheKeys); err != nil {
return
}
}
}
}
// run the before hooks
for i := 0; i < srcVal.Len(); i++ {
if oldIfs[i] == nil {
if err = runProcess(c, srcVal.Index(i).Interface(), BeforeCreateName, nil); err != nil {
return
}
} else {
if err = runProcess(c, srcVal.Index(i).Interface(), BeforeUpdateName, oldIfs[i]); err != nil {
return
}
}
if err = runProcess(c, srcVal.Index(i).Interface(), BeforeSaveName, oldIfs[i]); err != nil {
return
}
if err = runProcess(c, srcVal.Index(i).Interface(), ValidateName, nil); err != nil {
return
}
}
// actually save
if gaeKeys, err = datastore.PutMulti(c, gaeKeys, src); err != nil {
return
}
// set ids and add memcache keys from the new entities
for i := 0; i < srcVal.Len(); i++ {
if ids[i], err = gaekey.FromGAE(gaeKeys[i]); err != nil {
return
}
srcVal.Index(i).Elem().FieldByName(idFieldName).Set(reflect.ValueOf(ids[i]))
if _, err = MemcacheKeys(c, srcVal.Index(i).Interface(), &memcacheKeys); err != nil {
return
}
}
// clear memcache
if err = memcache.Del(c, memcacheKeys...); err != nil {
return
}
// run the after hooks
for i := 0; i < srcVal.Len(); i++ {
if oldIfs[i] == nil {
if err = runProcess(c, srcVal.Index(i).Interface(), AfterCreateName, nil); err != nil {
return
}
} else {
if err = runProcess(c, srcVal.Index(i).Interface(), AfterUpdateName, oldIfs[i]); err != nil {
return
}
}
if err = runProcess(c, srcVal.Index(i).Interface(), AfterSaveName, oldIfs[i]); err != nil {
return
}
}
return
}