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package object
import (
"citrons.xyz/talk/proto"
"citrons.xyz/talk/server/session"
"citrons.xyz/talk/proto/validate"
"bufio"
"bytes"
"log"
bolt "go.etcd.io/bbolt"
)
type Object interface {
SendRequest(session.Request)
InfoFor(uid string) proto.Object
Data() proto.Object
}
type HasHandle interface {
Handle() string
}
type Kind interface {
Undata(o proto.Object) Object
}
type World struct {
db *bolt.DB
kinds map[string]Kind
objects map[string]Object
}
func NewWorld(db *bolt.DB) *World {
w := &World {db, make(map[string]Kind), make(map[string]Object)}
w.AddObjectKind("gone", TombstoneKind{})
return w
}
func (w *World) AddObjectKind(name string, kind Kind) {
w.kinds[name] = kind
}
func (w *World) getData(id string) proto.Object {
var data []byte
err := w.db.View(func (tx *bolt.Tx) error {
bucket := tx.Bucket([]byte("world"))
if bucket != nil {
data = bucket.Get([]byte(id))
}
return nil
})
if err != nil {
log.Fatal("reading database: ", err)
}
if len(data) == 0 {
return proto.Object {}
}
o, err := proto.ReadObject(bufio.NewReader(bytes.NewReader(data)))
if err != nil {
panic(err)
}
return o
}
func (w *World) setData(id string, o proto.Object) {
var buf bytes.Buffer
writer := bufio.NewWriter(&buf)
proto.WriteObject(writer, o)
writer.Flush()
err := w.db.Update(func (tx *bolt.Tx) error {
bucket, _ := tx.CreateBucketIfNotExists([]byte("world"))
return bucket.Put([]byte(id), buf.Bytes())
})
if err != nil {
log.Fatal("updating database: ", err)
}
}
func (w *World) GetObject(id string) Object {
if w.objects[id] == nil {
o := w.getData(id)
if o.Kind != "" {
w.objects[id] = w.kinds[o.Kind].Undata(o)
}
}
return w.objects[id]
}
func (w *World) PutObject(id string, o Object) {
w.objects[id] = o
if id == "" {
return
}
switch h := o.(type) {
case HasHandle:
err := w.db.Update(func(tx *bolt.Tx) error {
kinds, _ := tx.CreateBucketIfNotExists([]byte("kinds"))
kind, _ := kinds.CreateBucketIfNotExists([]byte(o.Data().Kind))
byHandle, _ := kind.CreateBucketIfNotExists([]byte("by handle"))
byId, _ := kind.CreateBucketIfNotExists([]byte("by id"))
existing := byId.Get([]byte(id))
if len(existing) != 0 {
byHandle.Delete(existing)
}
handle := []byte(validate.Fold(h.Handle()))
byHandle.Put(handle, []byte(id))
byId.Put([]byte(id), handle)
return nil
})
if err != nil {
log.Fatal("updating database: ", err)
}
}
w.setData(id, o.Data())
}
func (w *World) Lookup(kind string, handle string) Object {
handle = validate.Fold(handle)
var id string
err := w.db.View(func(tx *bolt.Tx) error {
kinds := tx.Bucket([]byte("kinds"))
if kinds == nil {
return nil
}
kind := kinds.Bucket([]byte(kind))
if kind == nil {
return nil
}
id = string(kind.Bucket([]byte("by handle")).Get([]byte(handle)))
return nil
})
if err != nil {
log.Fatal("reading database: ", err)
}
if id != "" {
return w.GetObject(id)
}
return nil
}
func (w *World) NewObject(o Object) string {
id := proto.GenId()
w.PutObject(id, o)
return id
}
func (w *World) DB() *bolt.DB {
return w.db
}
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