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directory.go
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directory.go
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package stored
import (
"bytes"
"hash/fnv"
"math/rand"
"net"
"sync"
"time"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/directory"
)
// Directory is wrapper around foundation db directories, main entry point for working with STORED
type Directory struct {
Name string
Cluster *Cluster
Subspace directory.DirectorySubspace
objects map[string]*Object
mux sync.Mutex
}
// init require name and cluster properties to be set
func (d *Directory) init() {
subspace, err := directory.CreateOrOpen(d.Cluster.db, []string{"dir", d.Name}, nil)
if err != nil {
panic(err)
}
d.Subspace = subspace
d.objects = map[string]*Object{}
// randomising
// To Generate seed number we will use unix nano timestamp, plus hash from system amc adress
// in most cases mac addresses will be roughly same in docker containers, but still small source
// of entropy
// Todo: best way is to add increment counter in foundationdb itself as part of first connect
// transaction. This way each client instance will have unique id
seed := time.Now().UnixNano()
interfaces, err := net.Interfaces()
if err == nil {
for _, i := range interfaces {
if i.Flags&net.FlagUp != 0 && bytes.Compare(i.HardwareAddr, nil) != 0 {
h := fnv.New64()
h.Write([]byte(i.HardwareAddr.String()))
seed += int64(h.Sum64() / 1000000)
break
}
}
}
rand.Seed(seed)
}
// Object declares new object for document layer
func (d *Directory) Object(name string, schemeObj interface{}) *ObjectBuilder {
object := &Object{
name: name,
db: &d.Cluster.db,
directory: d,
indexes: map[string]*Index{},
counters: map[string]*Counter{},
}
ob := ObjectBuilder{
waitAll: sync.WaitGroup{},
object: object,
}
ob.buildScheme(schemeObj)
d.mux.Lock()
d.objects[name] = object
d.mux.Unlock()
ob.waitInit.Add(1)
//fmt.Println("init +1")
ob.waitAll.Add(1)
//fmt.Println("all +1")
go ob.need()
return &ob
/// OLD
/*object := &Object{}
object.init(name, &d.Cluster.db, d, schemeObj)
d.mux.Lock()
d.objects[name] = object
d.mux.Unlock()
ob := ObjectBuilder{
object: object,
}
ob.need()
return &ob*/
}
// Clear removes all content inside directory
func (d *Directory) Clear() error {
_, err := d.Cluster.db.Transact(func(tr fdb.Transaction) (ret interface{}, e error) {
for _, obj := range d.objects {
err := obj.Clear()
if err != nil {
return nil, err
}
}
return
})
if err != nil {
return err
}
return nil
}
// Multi creates reference object for multi requests
func (d *Directory) Multi() *MultiChain {
mc := MultiChain{db: d.Cluster.db}
mc.init()
return &mc
}
// Build will returen db object ready to operate
/*func (d *Directory) Build() *Database {
db := Database{
objects: d.objects,
cluster: d.Cluster,
}
db.init()
return &db
}*/
// Read will run callback in read transaction
func (d *Directory) Read(callback func(*Transaction)) *Transaction {
db := &d.Cluster.db
t := Transaction{db: db}
_, err := db.ReadTransact(func(tr fdb.ReadTransaction) (interface{}, error) {
t.initRead(tr)
callback(&t)
return nil, t.Err()
})
t.err = err
return &t
}
// Write will run callback in write transaction
func (d *Directory) Write(callback func(*Transaction)) *Transaction {
db := &d.Cluster.db
t := Transaction{db: db}
_, err := db.Transact(func(tr fdb.Transaction) (interface{}, error) {
t.initWrite(tr)
callback(&t)
return nil, t.Err()
})
if t.err == nil {
t.err = err
}
return &t
}
// Parallel will create read transaction to perform multi gets
func (d *Directory) Parallel(tasks ...PromiseAny) *Transaction {
db := &d.Cluster.db
t := Transaction{
tasks: []transactionTask{},
db: db,
}
for _, task := range tasks {
t.tasks = append(t.tasks, transactionTask{
promise: task.self(),
check: true,
})
}
return &t
}