/
db.go
164 lines (136 loc) · 3.5 KB
/
db.go
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package main
import (
"errors"
"fmt"
"github.com/jmhodges/levigo"
"github.com/mynameisfiber/gocountme/kminvalues"
)
var (
NoKeySpecified = errors.New("No Key supplied for db Request")
NotImplemented = errors.New("Not Implemented")
)
type Result struct {
Key string
Data *kminvalues.KMinValues
Error error
}
type RequestCommand interface {
Execute(database *levigo.DB, ro *levigo.ReadOptions, wo *levigo.WriteOptions) (*kminvalues.KMinValues, error)
WriteResult(result Result)
}
type GetRequest struct {
Key string
ResultChan chan Result
}
type SetRequest struct {
Key string
Kmv *kminvalues.KMinValues
ResultChan chan Result
}
type DeleteRequest struct {
Key string
ResultChan chan Result
}
type AddHashRequest struct {
Key string
Hash uint64
ResultChan chan Result
}
type ResizeRequest struct {
Key string
NewSize int
ResultChan chan Result
}
func (gr GetRequest) WriteResult(result Result) {
result.Key = gr.Key
gr.ResultChan <- result
}
func (sr SetRequest) WriteResult(result Result) {
result.Key = sr.Key
sr.ResultChan <- result
}
func (dr DeleteRequest) WriteResult(result Result) {
result.Key = dr.Key
dr.ResultChan <- result
}
func (ahr AddHashRequest) WriteResult(result Result) {
result.Key = ahr.Key
ahr.ResultChan <- result
}
func (rr ResizeRequest) WriteResult(result Result) {
result.Key = rr.Key
rr.ResultChan <- result
}
func (gr GetRequest) Execute(database *levigo.DB, ro *levigo.ReadOptions, wo *levigo.WriteOptions) (*kminvalues.KMinValues, error) {
if gr.Key == "" {
return nil, NoKeySpecified
}
data, err := database.Get(ro, []byte(gr.Key))
if err != nil {
return nil, err
}
kmv, err := kminvalues.KMinValuesFromBytes(data)
if err != nil {
if len(data) == 0 {
kmv = kminvalues.NewKMinValues(*defaultSize)
} else {
return nil, err
}
}
return kmv, err
}
func (sr SetRequest) Execute(database *levigo.DB, ro *levigo.ReadOptions, wo *levigo.WriteOptions) (*kminvalues.KMinValues, error) {
if sr.Key == "" {
return nil, NoKeySpecified
}
keyBytes := []byte(sr.Key)
err := database.Put(wo, keyBytes, sr.Kmv.Bytes())
return sr.Kmv, err
}
func (dr DeleteRequest) Execute(database *levigo.DB, ro *levigo.ReadOptions, wo *levigo.WriteOptions) (*kminvalues.KMinValues, error) {
if dr.Key == "" {
return nil, NoKeySpecified
}
keyBytes := []byte(dr.Key)
err := database.Delete(wo, keyBytes)
return nil, err
}
func (ahr AddHashRequest) Execute(database *levigo.DB, ro *levigo.ReadOptions, wo *levigo.WriteOptions) (*kminvalues.KMinValues, error) {
if ahr.Key == "" {
return nil, NoKeySpecified
}
keyBytes := []byte(ahr.Key)
data, err := database.Get(ro, keyBytes)
if err != nil {
return nil, err
}
kmv, err := kminvalues.KMinValuesFromBytes(data)
if err != nil {
if len(data) == 0 {
kmv = kminvalues.NewKMinValues(*defaultSize)
} else {
return nil, err
}
}
kmv.AddHash(ahr.Hash)
err = database.Put(wo, keyBytes, kmv.Bytes())
return kmv, err
}
func (rr ResizeRequest) Execute(database *levigo.DB, ro *levigo.ReadOptions, wo *levigo.WriteOptions) (*kminvalues.KMinValues, error) {
// TODO: fix this
return nil, fmt.Errorf("Not implemented")
}
func levelDBWorker(database *levigo.DB, requestChan chan RequestCommand) error {
ro := levigo.NewReadOptions()
wo := levigo.NewWriteOptions()
defer ro.Close()
defer wo.Close()
for request := range requestChan {
kmv, err := request.Execute(database, ro, wo)
request.WriteResult(Result{
Data: kmv,
Error: err,
})
}
return nil
}