92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
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package main
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import "log"
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import "io/ioutil"
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import "github.com/dgraph-io/badger"
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// SteemDataStore is the object with which the rest of this tool interacts
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type SteemDataStore struct {
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kv KeyValueStorer
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}
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func NewSteemDataStore(dir string) *SteemDataStore {
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self := new(SteemDataStore)
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self.kv = NewBadgerKeyValueStore(dir)
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return self
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}
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func (self *SteemDataStore) StoreBlockOps(blockNum int, blockOps []byte) {
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panic("not implemented")
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}
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// KeyValueStorer is an interface for the backend kv store used by
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// SteemDataStore
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// it could be fs, badgerdb, whatever
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type KeyValueStorer interface {
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Open(string)
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Get(*string) (*string, error)
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Put(*string, *string) error
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Close()
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}
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// BadgerKeyValueStore is an object that conforms to KeyValueStorer for use
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// by SteemDataStore to persist Steem data
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type BadgerKeyValueStore struct {
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db *badger.DB
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}
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func NewBadgerKeyValueStore(dir string) *BadgerKeyValueStore {
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kv := new(BadgerKeyValueStore)
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kv.Open(dir)
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return kv
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}
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func (kv *BadgerKeyValueStore) Open(dir string) {
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dir, err := ioutil.TempDir("", "badger")
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if err != nil {
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log.Fatal(err)
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}
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opts := badger.DefaultOptions
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opts.Dir = dir
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opts.ValueDir = dir
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kv.db, err = badger.Open(opts)
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if err != nil {
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log.Fatal(err)
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}
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}
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func (kv *BadgerKeyValueStore) Close() {
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kv.db.Close()
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}
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func (kv *BadgerKeyValueStore) Put(key *string, value *string) error {
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txn := kv.db.NewTransaction(true) // Read-write txn
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err := txn.Set([]byte(*key), []byte(*value))
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if err != nil {
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log.Fatal(err)
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}
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err = txn.Commit(nil)
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if err != nil {
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log.Fatal(err)
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}
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return nil
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}
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func (kv *BadgerKeyValueStore) Get(key *string) (*string, error) {
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txn := kv.db.NewTransaction(true) // Read-write txn
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item, err := txn.Get([]byte(*key))
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if err != nil {
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return nil, err
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}
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val, err := item.ValueCopy(nil)
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if err != nil {
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return nil, err
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}
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s := string(val)
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return &s, nil
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}
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