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v2 (#2) 

Co-authored-by: jdl <jdl@desktop>
Reviewed-on: #2
master v0.2.0
J. David Lee 2023-11-17 10:06:56 +00:00
parent 526196ef9d
commit ba1990e379
7 changed files with 50 additions and 247 deletions
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45
mdb/collection.go
View File

@ -21,10 +21,10 @@ type Collection[T any] struct {
sanitize func(*T)
validate func(*T) error
indices []Index[T]
uniqueIndices []Index[T]
indices []*Index[T]
uniqueIndices []*Index[T]
ByID Index[T]
ByID *Index[T]
buf *bytes.Buffer
}
@ -65,8 +65,8 @@ func NewCollection[T any](db *Database, name string, conf *CollectionConfig[T])
copy: conf.Copy,
sanitize: conf.Sanitize,
validate: conf.Validate,
indices: []Index[T]{},
uniqueIndices: []Index[T]{},
indices: []*Index[T]{},
uniqueIndices: []*Index[T]{},
buf: &bytes.Buffer{},
}
@ -92,7 +92,7 @@ func NewCollection[T any](db *Database, name string, conf *CollectionConfig[T])
return c
}
func (c Collection[T]) Name() string {
func (c *Collection[T]) Name() string {
return c.name
}
@ -108,13 +108,13 @@ type indexConfig[T any] struct {
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)
c.setID(x, id)
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 {
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.
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
if conf.Unique {
@ -160,7 +159,7 @@ func (c *Collection[T]) addIndex(conf indexConfig[T]) Index[T] {
BTree: btree.NewG(256, less),
}
index := Index[T]{
index := &Index[T]{
collectionID: c.collectionID,
name: conf.Name,
indexID: c.getState(c.db.Snapshot()).addIndex(indexState),
@ -176,7 +175,7 @@ func (c *Collection[T]) addIndex(conf indexConfig[T]) Index[T] {
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 {
return err
}
@ -203,7 +202,7 @@ func (c Collection[T]) Insert(tx *Snapshot, userItem *T) error {
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 {
return err
}
@ -235,7 +234,7 @@ func (c Collection[T]) Update(tx *Snapshot, userItem *T) error {
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)
if err == nil {
return nil
@ -246,7 +245,7 @@ func (c Collection[T]) Upsert(tx *Snapshot, item *T) error {
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 {
return err
}
@ -254,13 +253,13 @@ func (c Collection[T]) Delete(tx *Snapshot, itemID uint64) error {
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)
c.setID(x, itemID)
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() {
return errs.ReadOnly
}
@ -274,7 +273,7 @@ func (c Collection[T]) ensureMutable(tx *Snapshot) error {
}
// 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)
if err := json.Unmarshal(data, item); err != nil {
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
}
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)
if !ok {
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
// 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)
if ok {
tx.delete(c.collectionID, itemID)
@ -335,14 +334,14 @@ func (c Collection[T]) upsertItem(tx *Snapshot, itemID uint64, data []byte) erro
return nil
}
func (c Collection[T]) getID(t *T) uint64 {
func (c *Collection[T]) getID(t *T) uint64 {
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
}
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])
}

67
mdb/db-primary.go
View File

@ -1,67 +0,0 @@
package mdb
/*
func (db *Database) openPrimary() (err error) {
wal, err := cwal.Open(db.walRootDir, cwal.Config{
SegMinCount: db.conf.WALSegMinCount,
SegMaxAgeSec: db.conf.WALSegMaxAgeSec,
})
pFile, err := pfile.Open(db.pageFilePath,
pFile, err := openPageFileAndReplayWAL(db.rootDir)
if err != nil {
return err
}
defer pFile.Close()
pfHeader, err := pFile.ReadHeader()
if err != nil {
return err
}
tx := db.Snapshot()
tx.seqNum = pfHeader.SeqNum
tx.updatedAt = pfHeader.UpdatedAt
pIndex, err := pagefile.NewIndex(pFile)
if err != nil {
return err
}
err = pFile.IterateAllocated(pIndex, func(cID, iID uint64, data []byte) error {
return db.loadItem(tx, cID, iID, data)
})
if err != nil {
return err
}
w, err := cwal.OpenWriter(db.walRootDir, &cwal.WriterConfig{
SegMinCount: db.conf.WALSegMinCount,
SegMaxAgeSec: db.conf.WALSegMaxAgeSec,
})
if err != nil {
return err
}
db.done.Add(1)
go txAggregator{
Stop: db.stop,
Done: db.done,
ModChan: db.modChan,
W: w,
Index: pIndex,
Snapshot: db.snapshot,
}.Run()
db.done.Add(1)
go (&fileWriter{
Stop: db.stop,
Done: db.done,
PageFilePath: db.pageFilePath,
WALRootDir: db.walRootDir,
}).Run()
return nil
}
*/

129
mdb/db-secondary.go
View File

@ -1,129 +0,0 @@
package mdb
/*
func (db *Database) openSecondary() (err error) {
if db.shouldLoadFromPrimary() {
if err := db.loadFromPrimary(); err != nil {
return err
}
}
log.Printf("Opening page-file...")
pFile, err := openPageFileAndReplayWAL(db.rootDir)
if err != nil {
return err
}
defer pFile.Close()
pfHeader, err := pFile.ReadHeader()
if err != nil {
return err
}
log.Printf("Building page-file index...")
pIndex, err := pagefile.NewIndex(pFile)
if err != nil {
return err
}
tx := db.Snapshot()
tx.seqNum = pfHeader.SeqNum
tx.updatedAt = pfHeader.UpdatedAt
log.Printf("Loading data into memory...")
err = pFile.IterateAllocated(pIndex, func(cID, iID uint64, data []byte) error {
return db.loadItem(tx, cID, iID, data)
})
if err != nil {
return err
}
log.Printf("Creating writer...")
w, err := cswal.OpenWriter(db.walRootDir, &cswal.WriterConfig{
SegMinCount: db.conf.WALSegMinCount,
SegMaxAgeSec: db.conf.WALSegMaxAgeSec,
})
if err != nil {
return err
}
db.done.Add(1)
go (&walFollower{
Stop: db.stop,
Done: db.done,
W: w,
Client: NewClient(db.conf.PrimaryURL, db.conf.ReplicationPSK, db.conf.NetTimeout),
}).Run()
db.done.Add(1)
go (&follower{
Stop: db.stop,
Done: db.done,
WALRootDir: db.walRootDir,
SeqNum: pfHeader.SeqNum,
ApplyChanges: db.applyChanges,
}).Run()
db.done.Add(1)
go (&fileWriter{
Stop: db.stop,
Done: db.done,
PageFilePath: db.pageFilePath,
WALRootDir: db.walRootDir,
}).Run()
return nil
}
func (db *Database) shouldLoadFromPrimary() bool {
if _, err := os.Stat(db.walRootDir); os.IsNotExist(err) {
log.Printf("WAL doesn't exist.")
return true
}
if _, err := os.Stat(db.pageFilePath); os.IsNotExist(err) {
log.Printf("Page-file doesn't exist.")
return true
}
return false
}
func (db *Database) loadFromPrimary() error {
client := NewClient(db.conf.PrimaryURL, db.conf.ReplicationPSK, db.conf.NetTimeout)
defer client.Disconnect()
log.Printf("Loading data from primary...")
if err := os.RemoveAll(db.pageFilePath); err != nil {
log.Printf("Failed to remove page-file: %s", err)
return errs.IO.WithErr(err) // Caller can retry.
}
if err := os.RemoveAll(db.walRootDir); err != nil {
log.Printf("Failed to remove WAL: %s", err)
return errs.IO.WithErr(err) // Caller can retry.
}
err := client.DownloadPageFile(db.pageFilePath+".tmp", db.pageFilePath)
if err != nil {
log.Printf("Failed to get page-file from primary: %s", err)
return err // Caller can retry.
}
pfHeader, err := pagefile.ReadHeader(db.pageFilePath)
if err != nil {
log.Printf("Failed to read page-file sequence number: %s", err)
return err // Caller can retry.
}
if err = cswal.CreateEx(db.walRootDir, pfHeader.SeqNum+1); err != nil {
log.Printf("Failed to initialize WAL: %s", err)
return err // Caller can retry.
}
return nil
}
*/

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 min, ok := index.Min(tx); ok {
t.Fatal(min)

2
mdb/db-userdata_test.go
View File

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

6
mdb/db-users_test.go
View File

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

46
mdb/index.go
View File

@ -10,7 +10,7 @@ func NewIndex[T any](
c *Collection[T],
name string,
compare func(lhs, rhs *T) int,
) Index[T] {
) *Index[T] {
return c.addIndex(indexConfig[T]{
Name: name,
Unique: false,
@ -24,7 +24,7 @@ func NewPartialIndex[T any](
name string,
compare func(lhs, rhs *T) int,
include func(*T) bool,
) Index[T] {
) *Index[T] {
return c.addIndex(indexConfig[T]{
Name: name,
Unique: false,
@ -37,7 +37,7 @@ func NewUniqueIndex[T any](
c *Collection[T],
name string,
compare func(lhs, rhs *T) int,
) Index[T] {
) *Index[T] {
return c.addIndex(indexConfig[T]{
Name: name,
Unique: true,
@ -51,7 +51,7 @@ func NewUniquePartialIndex[T any](
name string,
compare func(lhs, rhs *T) int,
include func(*T) bool,
) Index[T] {
) *Index[T] {
return c.addIndex(indexConfig[T]{
Name: name,
Unique: true,
@ -70,7 +70,7 @@ type Index[T any] struct {
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)
if !ok {
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
}
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)
}
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)
}
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()
if !ok {
return item, false
@ -94,7 +94,7 @@ func (i Index[T]) Min(tx *Snapshot) (item *T, ok bool) {
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()
if !ok {
return item, false
@ -102,25 +102,25 @@ func (i Index[T]) Max(tx *Snapshot) (item *T, ok bool) {
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 {
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 {
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 {
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 {
return each(i.copy(t))
})
@ -133,7 +133,7 @@ type ListArgs[T any] struct {
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 {
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)
}
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)
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
// should ensure that the index has been properly cloned for write before
// 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) {
return
}
@ -196,7 +196,7 @@ func (i Index[T]) insert(tx *Snapshot, item *T) {
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.Delete(old)
@ -204,22 +204,22 @@ func (i Index[T]) update(tx *Snapshot, old, new *T) {
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)
}
// ----------------------------------------------------------------------------
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]
}
// 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
}
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])
bt := cState.Indices[i.indexID].BTree
@ -231,6 +231,6 @@ func (i Index[T]) btreeForIter(tx *Snapshot) *btree.BTreeG[*T] {
return bt
}
func (i Index[T]) getID(t *T) uint64 {
func (i *Index[T]) getID(t *T) uint64 {
return *((*uint64)(unsafe.Pointer(t)))
}