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Pointer receivers

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jdl 2023-11-16 09:25:01 +01:00
parent 429f410681
commit 8a8c2d9bed
5 changed files with 50 additions and 51 deletions
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45
mdb/collection.go
View File

@ -21,10 +21,10 @@ type Collection[T any] struct {
sanitize func(*T) sanitize func(*T)
validate func(*T) error validate func(*T) error
indices []Index[T] indices []*Index[T]
uniqueIndices []Index[T] uniqueIndices []*Index[T]
ByID Index[T] ByID *Index[T]
buf *bytes.Buffer buf *bytes.Buffer
} }
@ -65,8 +65,8 @@ func NewCollection[T any](db *Database, name string, conf *CollectionConfig[T])
copy: conf.Copy, copy: conf.Copy,
sanitize: conf.Sanitize, sanitize: conf.Sanitize,
validate: conf.Validate, validate: conf.Validate,
indices: []Index[T]{}, indices: []*Index[T]{},
uniqueIndices: []Index[T]{}, uniqueIndices: []*Index[T]{},
buf: &bytes.Buffer{}, buf: &bytes.Buffer{},
} }
@ -92,7 +92,7 @@ func NewCollection[T any](db *Database, name string, conf *CollectionConfig[T])
return c return c
} }
func (c Collection[T]) Name() string { func (c *Collection[T]) Name() string {
return c.name return c.name
} }
@ -108,13 +108,13 @@ type indexConfig[T any] struct {
Include func(item *T) bool Include func(item *T) bool
} }
func (c Collection[T]) Get(tx *Snapshot, id uint64) (*T, bool) { func (c *Collection[T]) Get(tx *Snapshot, id uint64) (*T, bool) {
x := new(T) x := new(T)
c.setID(x, id) c.setID(x, id)
return c.ByID.Get(tx, x) return c.ByID.Get(tx, x)
} }
func (c Collection[T]) List(tx *Snapshot, ids []uint64, out []*T) []*T { func (c *Collection[T]) List(tx *Snapshot, ids []uint64, out []*T) []*T {
if len(ids) == 0 { if len(ids) == 0 {
return out[:0] return out[:0]
} }
@ -135,8 +135,7 @@ func (c Collection[T]) List(tx *Snapshot, ids []uint64, out []*T) []*T {
} }
// AddIndex: Add an index to the collection. // AddIndex: Add an index to the collection.
func (c *Collection[T]) addIndex(conf indexConfig[T]) Index[T] { func (c *Collection[T]) addIndex(conf indexConfig[T]) *Index[T] {
var less func(*T, *T) bool var less func(*T, *T) bool
if conf.Unique { if conf.Unique {
@ -160,7 +159,7 @@ func (c *Collection[T]) addIndex(conf indexConfig[T]) Index[T] {
BTree: btree.NewG(256, less), BTree: btree.NewG(256, less),
} }
index := Index[T]{ index := &Index[T]{
collectionID: c.collectionID, collectionID: c.collectionID,
name: conf.Name, name: conf.Name,
indexID: c.getState(c.db.Snapshot()).addIndex(indexState), indexID: c.getState(c.db.Snapshot()).addIndex(indexState),
@ -176,7 +175,7 @@ func (c *Collection[T]) addIndex(conf indexConfig[T]) Index[T] {
return index return index
} }
func (c Collection[T]) Insert(tx *Snapshot, userItem *T) error { func (c *Collection[T]) Insert(tx *Snapshot, userItem *T) error {
if err := c.ensureMutable(tx); err != nil { if err := c.ensureMutable(tx); err != nil {
return err return err
} }
@ -203,7 +202,7 @@ func (c Collection[T]) Insert(tx *Snapshot, userItem *T) error {
return nil return nil
} }
func (c Collection[T]) Update(tx *Snapshot, userItem *T) error { func (c *Collection[T]) Update(tx *Snapshot, userItem *T) error {
if err := c.ensureMutable(tx); err != nil { if err := c.ensureMutable(tx); err != nil {
return err return err
} }
@ -235,7 +234,7 @@ func (c Collection[T]) Update(tx *Snapshot, userItem *T) error {
return nil return nil
} }
func (c Collection[T]) Upsert(tx *Snapshot, item *T) error { func (c *Collection[T]) Upsert(tx *Snapshot, item *T) error {
err := c.Insert(tx, item) err := c.Insert(tx, item)
if err == nil { if err == nil {
return nil return nil
@ -246,7 +245,7 @@ func (c Collection[T]) Upsert(tx *Snapshot, item *T) error {
return err return err
} }
func (c Collection[T]) Delete(tx *Snapshot, itemID uint64) error { func (c *Collection[T]) Delete(tx *Snapshot, itemID uint64) error {
if err := c.ensureMutable(tx); err != nil { if err := c.ensureMutable(tx); err != nil {
return err return err
} }
@ -254,13 +253,13 @@ func (c Collection[T]) Delete(tx *Snapshot, itemID uint64) error {
return c.deleteItem(tx, itemID) return c.deleteItem(tx, itemID)
} }
func (c Collection[T]) getByID(tx *Snapshot, itemID uint64) (*T, bool) { func (c *Collection[T]) getByID(tx *Snapshot, itemID uint64) (*T, bool) {
x := new(T) x := new(T)
c.setID(x, itemID) c.setID(x, itemID)
return c.ByID.get(tx, x) return c.ByID.get(tx, x)
} }
func (c Collection[T]) ensureMutable(tx *Snapshot) error { func (c *Collection[T]) ensureMutable(tx *Snapshot) error {
if !tx.writable() { if !tx.writable() {
return errs.ReadOnly return errs.ReadOnly
} }
@ -274,7 +273,7 @@ func (c Collection[T]) ensureMutable(tx *Snapshot) error {
} }
// For initial data loading. // For initial data loading.
func (c Collection[T]) insertItem(tx *Snapshot, itemID uint64, data []byte) error { func (c *Collection[T]) insertItem(tx *Snapshot, itemID uint64, data []byte) error {
item := new(T) item := new(T)
if err := json.Unmarshal(data, item); err != nil { if err := json.Unmarshal(data, item); err != nil {
return errs.Encoding.WithErr(err).WithCollection(c.name) return errs.Encoding.WithErr(err).WithCollection(c.name)
@ -295,7 +294,7 @@ func (c Collection[T]) insertItem(tx *Snapshot, itemID uint64, data []byte) erro
return nil return nil
} }
func (c Collection[T]) deleteItem(tx *Snapshot, itemID uint64) error { func (c *Collection[T]) deleteItem(tx *Snapshot, itemID uint64) error {
item, ok := c.getByID(tx, itemID) item, ok := c.getByID(tx, itemID)
if !ok { if !ok {
return errs.NotFound return errs.NotFound
@ -312,7 +311,7 @@ func (c Collection[T]) deleteItem(tx *Snapshot, itemID uint64) error {
// upsertItem inserts or updates the item with itemID and the given serialized // upsertItem inserts or updates the item with itemID and the given serialized
// form. It's called by // form. It's called by
func (c Collection[T]) upsertItem(tx *Snapshot, itemID uint64, data []byte) error { func (c *Collection[T]) upsertItem(tx *Snapshot, itemID uint64, data []byte) error {
item, ok := c.getByID(tx, itemID) item, ok := c.getByID(tx, itemID)
if ok { if ok {
tx.delete(c.collectionID, itemID) tx.delete(c.collectionID, itemID)
@ -335,14 +334,14 @@ func (c Collection[T]) upsertItem(tx *Snapshot, itemID uint64, data []byte) erro
return nil return nil
} }
func (c Collection[T]) getID(t *T) uint64 { func (c *Collection[T]) getID(t *T) uint64 {
return *((*uint64)(unsafe.Pointer(t))) return *((*uint64)(unsafe.Pointer(t)))
} }
func (c Collection[T]) setID(t *T, id uint64) { func (c *Collection[T]) setID(t *T, id uint64) {
*((*uint64)(unsafe.Pointer(t))) = id *((*uint64)(unsafe.Pointer(t))) = id
} }
func (c Collection[T]) getState(tx *Snapshot) *collectionState[T] { func (c *Collection[T]) getState(tx *Snapshot) *collectionState[T] {
return tx.collections[c.collectionID].(*collectionState[T]) return tx.collections[c.collectionID].(*collectionState[T])
} }

2
mdb/db-testrunner_test.go
View File

@ -134,7 +134,7 @@ func checkSlicesEqual[T any](t *testing.T, name string, actual, expected []T) {
} }
} }
func checkMinMaxEqual[T any](t *testing.T, name string, tx *Snapshot, index Index[T], expected []T) { func checkMinMaxEqual[T any](t *testing.T, name string, tx *Snapshot, index *Index[T], expected []T) {
if len(expected) == 0 { if len(expected) == 0 {
if min, ok := index.Min(tx); ok { if min, ok := index.Min(tx); ok {
t.Fatal(min) t.Fatal(min)

2
mdb/db-userdata_test.go
View File

@ -14,7 +14,7 @@ type UserDataItem struct {
type UserData struct { type UserData struct {
*Collection[UserDataItem] *Collection[UserDataItem]
ByName Index[UserDataItem] // Unique index on (Token). ByName *Index[UserDataItem] // Unique index on (Token).
} }
func NewUserDataCollection(db *Database) UserData { func NewUserDataCollection(db *Database) UserData {

6
mdb/db-users_test.go
View File

@ -12,9 +12,9 @@ type User struct {
type Users struct { type Users struct {
*Collection[User] *Collection[User]
ByEmail Index[User] // Unique index on (Email). ByEmail *Index[User] // Unique index on (Email).
ByName Index[User] // Index on (Name). ByName *Index[User] // Index on (Name).
ByBlocked Index[User] // Partial index on (Blocked,Email). ByBlocked *Index[User] // Partial index on (Blocked,Email).
} }
func NewUserCollection(db *Database) Users { func NewUserCollection(db *Database) Users {

46
mdb/index.go
View File

@ -10,7 +10,7 @@ func NewIndex[T any](
c *Collection[T], c *Collection[T],
name string, name string,
compare func(lhs, rhs *T) int, compare func(lhs, rhs *T) int,
) Index[T] { ) *Index[T] {
return c.addIndex(indexConfig[T]{ return c.addIndex(indexConfig[T]{
Name: name, Name: name,
Unique: false, Unique: false,
@ -24,7 +24,7 @@ func NewPartialIndex[T any](
name string, name string,
compare func(lhs, rhs *T) int, compare func(lhs, rhs *T) int,
include func(*T) bool, include func(*T) bool,
) Index[T] { ) *Index[T] {
return c.addIndex(indexConfig[T]{ return c.addIndex(indexConfig[T]{
Name: name, Name: name,
Unique: false, Unique: false,
@ -37,7 +37,7 @@ func NewUniqueIndex[T any](
c *Collection[T], c *Collection[T],
name string, name string,
compare func(lhs, rhs *T) int, compare func(lhs, rhs *T) int,
) Index[T] { ) *Index[T] {
return c.addIndex(indexConfig[T]{ return c.addIndex(indexConfig[T]{
Name: name, Name: name,
Unique: true, Unique: true,
@ -51,7 +51,7 @@ func NewUniquePartialIndex[T any](
name string, name string,
compare func(lhs, rhs *T) int, compare func(lhs, rhs *T) int,
include func(*T) bool, include func(*T) bool,
) Index[T] { ) *Index[T] {
return c.addIndex(indexConfig[T]{ return c.addIndex(indexConfig[T]{
Name: name, Name: name,
Unique: true, Unique: true,
@ -70,7 +70,7 @@ type Index[T any] struct {
copy func(*T) *T copy func(*T) *T
} }
func (i Index[T]) Get(tx *Snapshot, in *T) (item *T, ok bool) { func (i *Index[T]) Get(tx *Snapshot, in *T) (item *T, ok bool) {
tPtr, ok := i.get(tx, in) tPtr, ok := i.get(tx, in)
if !ok { if !ok {
return item, false return item, false
@ -78,15 +78,15 @@ func (i Index[T]) Get(tx *Snapshot, in *T) (item *T, ok bool) {
return i.copy(tPtr), true return i.copy(tPtr), true
} }
func (i Index[T]) get(tx *Snapshot, in *T) (*T, bool) { func (i *Index[T]) get(tx *Snapshot, in *T) (*T, bool) {
return i.btree(tx).Get(in) return i.btree(tx).Get(in)
} }
func (i Index[T]) Has(tx *Snapshot, in *T) bool { func (i *Index[T]) Has(tx *Snapshot, in *T) bool {
return i.btree(tx).Has(in) return i.btree(tx).Has(in)
} }
func (i Index[T]) Min(tx *Snapshot) (item *T, ok bool) { func (i *Index[T]) Min(tx *Snapshot) (item *T, ok bool) {
tPtr, ok := i.btree(tx).Min() tPtr, ok := i.btree(tx).Min()
if !ok { if !ok {
return item, false return item, false
@ -94,7 +94,7 @@ func (i Index[T]) Min(tx *Snapshot) (item *T, ok bool) {
return i.copy(tPtr), true return i.copy(tPtr), true
} }
func (i Index[T]) Max(tx *Snapshot) (item *T, ok bool) { func (i *Index[T]) Max(tx *Snapshot) (item *T, ok bool) {
tPtr, ok := i.btree(tx).Max() tPtr, ok := i.btree(tx).Max()
if !ok { if !ok {
return item, false return item, false
@ -102,25 +102,25 @@ func (i Index[T]) Max(tx *Snapshot) (item *T, ok bool) {
return i.copy(tPtr), true return i.copy(tPtr), true
} }
func (i Index[T]) Ascend(tx *Snapshot, each func(*T) bool) { func (i *Index[T]) Ascend(tx *Snapshot, each func(*T) bool) {
i.btreeForIter(tx).Ascend(func(t *T) bool { i.btreeForIter(tx).Ascend(func(t *T) bool {
return each(i.copy(t)) return each(i.copy(t))
}) })
} }
func (i Index[T]) AscendAfter(tx *Snapshot, after *T, each func(*T) bool) { func (i *Index[T]) AscendAfter(tx *Snapshot, after *T, each func(*T) bool) {
i.btreeForIter(tx).AscendGreaterOrEqual(after, func(t *T) bool { i.btreeForIter(tx).AscendGreaterOrEqual(after, func(t *T) bool {
return each(i.copy(t)) return each(i.copy(t))
}) })
} }
func (i Index[T]) Descend(tx *Snapshot, each func(*T) bool) { func (i *Index[T]) Descend(tx *Snapshot, each func(*T) bool) {
i.btreeForIter(tx).Descend(func(t *T) bool { i.btreeForIter(tx).Descend(func(t *T) bool {
return each(i.copy(t)) return each(i.copy(t))
}) })
} }
func (i Index[T]) DescendAfter(tx *Snapshot, after *T, each func(*T) bool) { func (i *Index[T]) DescendAfter(tx *Snapshot, after *T, each func(*T) bool) {
i.btreeForIter(tx).DescendLessOrEqual(after, func(t *T) bool { i.btreeForIter(tx).DescendLessOrEqual(after, func(t *T) bool {
return each(i.copy(t)) return each(i.copy(t))
}) })
@ -133,7 +133,7 @@ type ListArgs[T any] struct {
Limit int // Maximum number of items to return. 0 => All. Limit int // Maximum number of items to return. 0 => All.
} }
func (i Index[T]) List(tx *Snapshot, args ListArgs[T], out []*T) []*T { func (i *Index[T]) List(tx *Snapshot, args ListArgs[T], out []*T) []*T {
if args.Limit < 0 { if args.Limit < 0 {
return nil return nil
} }
@ -176,11 +176,11 @@ func (i Index[T]) List(tx *Snapshot, args ListArgs[T], out []*T) []*T {
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
func (i Index[T]) insertConflict(tx *Snapshot, item *T) bool { func (i *Index[T]) insertConflict(tx *Snapshot, item *T) bool {
return i.btree(tx).Has(item) return i.btree(tx).Has(item)
} }
func (i Index[T]) updateConflict(tx *Snapshot, item *T) bool { func (i *Index[T]) updateConflict(tx *Snapshot, item *T) bool {
current, ok := i.btree(tx).Get(item) current, ok := i.btree(tx).Get(item)
return ok && i.getID(current) != i.getID(item) return ok && i.getID(current) != i.getID(item)
} }
@ -188,7 +188,7 @@ func (i Index[T]) updateConflict(tx *Snapshot, item *T) bool {
// This should only be called after insertConflict. Additionally, the caller // This should only be called after insertConflict. Additionally, the caller
// should ensure that the index has been properly cloned for write before // should ensure that the index has been properly cloned for write before
// writing. // writing.
func (i Index[T]) insert(tx *Snapshot, item *T) { func (i *Index[T]) insert(tx *Snapshot, item *T) {
if i.include != nil && !i.include(item) { if i.include != nil && !i.include(item) {
return return
} }
@ -196,7 +196,7 @@ func (i Index[T]) insert(tx *Snapshot, item *T) {
i.btree(tx).ReplaceOrInsert(item) i.btree(tx).ReplaceOrInsert(item)
} }
func (i Index[T]) update(tx *Snapshot, old, new *T) { func (i *Index[T]) update(tx *Snapshot, old, new *T) {
bt := i.btree(tx) bt := i.btree(tx)
bt.Delete(old) bt.Delete(old)
@ -204,22 +204,22 @@ func (i Index[T]) update(tx *Snapshot, old, new *T) {
i.insert(tx, new) i.insert(tx, new)
} }
func (i Index[T]) delete(tx *Snapshot, item *T) { func (i *Index[T]) delete(tx *Snapshot, item *T) {
i.btree(tx).Delete(item) i.btree(tx).Delete(item)
} }
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
func (i Index[T]) getState(tx *Snapshot) indexState[T] { func (i *Index[T]) getState(tx *Snapshot) indexState[T] {
return tx.collections[i.collectionID].(*collectionState[T]).Indices[i.indexID] return tx.collections[i.collectionID].(*collectionState[T]).Indices[i.indexID]
} }
// Get the current btree for get/has/update/delete, etc. // Get the current btree for get/has/update/delete, etc.
func (i Index[T]) btree(tx *Snapshot) *btree.BTreeG[*T] { func (i *Index[T]) btree(tx *Snapshot) *btree.BTreeG[*T] {
return i.getState(tx).BTree return i.getState(tx).BTree
} }
func (i Index[T]) btreeForIter(tx *Snapshot) *btree.BTreeG[*T] { func (i *Index[T]) btreeForIter(tx *Snapshot) *btree.BTreeG[*T] {
cState := tx.collections[i.collectionID].(*collectionState[T]) cState := tx.collections[i.collectionID].(*collectionState[T])
bt := cState.Indices[i.indexID].BTree bt := cState.Indices[i.indexID].BTree
@ -231,6 +231,6 @@ func (i Index[T]) btreeForIter(tx *Snapshot) *btree.BTreeG[*T] {
return bt return bt
} }
func (i Index[T]) getID(t *T) uint64 { func (i *Index[T]) getID(t *T) uint64 {
return *((*uint64)(unsafe.Pointer(t))) return *((*uint64)(unsafe.Pointer(t)))
} }