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db.go
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db.go
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package rdbms
import (
"context"
"database/sql"
"sync"
"github.com/pkg/errors"
"github.com/rancher/k8s-sql/kv"
"k8s.io/apiserver/pkg/storage"
"k8s.io/apiserver/pkg/storage/storagebackend"
"k8s.io/apiserver/pkg/storage/storagebackend/factory"
"k8s.io/apiserver/pkg/storage/value"
)
var (
ErrNoDSN = errors.New("DB DSN must be set as ServerList")
// Just assume there is only one for now
globalClient kv.Client
globalClientLock sync.Mutex
)
func NewRDBMSStorage(c storagebackend.Config) (storage.Interface, factory.DestroyFunc, error) {
if len(c.ServerList) != 2 {
return nil, nil, ErrNoDSN
}
driverName, dsn := c.ServerList[0], c.ServerList[1]
dbClient, err := getClient(driverName, dsn)
if err != nil {
return nil, nil, err
}
transformer := c.Transformer
if transformer == nil {
transformer = value.NewMutableTransformer(value.IdentityTransformer)
}
return kv.New(dbClient, c.Codec, c.Prefix, transformer), func() {}, nil
}
func getClient(driverName, dsn string) (kv.Client, error) {
globalClientLock.Lock()
defer globalClientLock.Unlock()
if globalClient != nil {
return globalClient, nil
}
// Notice that we never close the DB connection or watcher (because this code assumes only one DB)
// "Room for improvement"
db, err := sql.Open(driverName, dsn)
if err != nil {
return nil, errors.Wrapf(err, "Failed to create DB(%s) connection", driverName)
}
dbClient, err := newClient(context.Background(), driverName, db)
if err != nil {
return nil, err
}
globalClient = dbClient
return globalClient, nil
}