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ddb.go
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ddb.go
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package kvstore
import (
"context"
"fmt"
"reflect"
"sort"
"github.com/justtrackio/gosoline/pkg/cfg"
"github.com/justtrackio/gosoline/pkg/ddb"
"github.com/justtrackio/gosoline/pkg/log"
"github.com/justtrackio/gosoline/pkg/mdl"
"github.com/justtrackio/gosoline/pkg/refl"
)
type DdbItem struct {
Key string `json:"key" ddb:"key=hash"`
Value string `json:"value"`
}
type DdbDeleteItem struct {
Key string `json:"key" ddb:"key=hash"`
}
type ddbKvStore[T any] struct {
repository ddb.Repository
settings *Settings
}
func DdbBaseName(settings *Settings) string {
return fmt.Sprintf("kvstore-%s", settings.Name)
}
func NewDdbKvStore[T any](ctx context.Context, config cfg.Config, logger log.Logger, settings *Settings) (KvStore[T], error) {
if reflect.ValueOf(new(T)).Elem().Kind() == reflect.Pointer {
return nil, fmt.Errorf("the generic type T should not be a pointer type but is of type %T", *new(T))
}
settings.PadFromConfig(config)
name := DdbBaseName(settings)
repository, err := ddb.NewRepository(ctx, config, logger, &ddb.Settings{
ClientName: settings.DdbSettings.ClientName,
ModelId: mdl.ModelId{
Project: settings.Project,
Environment: settings.Environment,
Family: settings.Family,
Group: settings.Group,
Application: settings.Application,
Name: name,
},
Main: ddb.MainSettings{
Model: DdbItem{},
ReadCapacityUnits: 5,
WriteCapacityUnits: 5,
},
})
if err != nil {
return nil, fmt.Errorf("can not create ddb repository: %w", err)
}
return NewDdbKvStoreWithInterfaces[T](repository, settings), nil
}
func NewDdbKvStoreWithInterfaces[T any](repository ddb.Repository, settings *Settings) KvStore[T] {
return NewMetricStoreWithInterfaces[T](&ddbKvStore[T]{
repository: repository,
settings: settings,
}, settings)
}
func (s *ddbKvStore[T]) Contains(ctx context.Context, key any) (bool, error) {
keyStr, err := CastKeyToString(key)
if err != nil {
return false, fmt.Errorf("can not cast key %T %v to string: %w", key, key, err)
}
item := &DdbItem{}
qb := s.repository.GetItemBuilder().WithHash(keyStr)
res, err := s.repository.GetItem(ctx, qb, item)
if err != nil {
return false, fmt.Errorf("can not check if ddb store contains the key %s: %w", keyStr, err)
}
return res.IsFound, nil
}
func (s *ddbKvStore[T]) Get(ctx context.Context, key any, value *T) (bool, error) {
keyStr, err := CastKeyToString(key)
if err != nil {
return false, fmt.Errorf("can not cast key %T %v to string: %w", key, key, err)
}
qb := s.repository.GetItemBuilder().WithHash(keyStr)
item := &DdbItem{}
res, err := s.repository.GetItem(ctx, qb, item)
if err != nil {
return false, fmt.Errorf("can not get item %s from ddb store: %w", keyStr, err)
}
if !res.IsFound {
return false, nil
}
bytes := []byte(item.Value)
err = Unmarshal(bytes, value)
if err != nil {
return false, fmt.Errorf("can not unmarshal value for item %s: %w", keyStr, err)
}
return true, nil
}
func (s *ddbKvStore[T]) GetBatch(ctx context.Context, keys any, result any) ([]interface{}, error) {
return getBatch(ctx, keys, result, s.getChunk, s.settings.BatchSize)
}
func (s *ddbKvStore[T]) getChunk(ctx context.Context, resultMap *refl.Map, keys []any) ([]interface{}, error) {
var err error
keyStrings := make([]string, len(keys))
keyMapToOriginal := make(map[string]interface{}, len(keys))
for i := 0; i < len(keyStrings); i++ {
keyStr, err := CastKeyToString(keys[i])
if err != nil {
return nil, fmt.Errorf("can not cast key %T %v to string: %w", keys[i], keys[i], err)
}
keyStrings[i] = keyStr
keyMapToOriginal[keyStr] = keys[i]
}
qb := s.repository.BatchGetItemsBuilder()
qb.WithHashKeys(keyStrings)
items := make([]DdbItem, 0)
_, err = s.repository.BatchGetItems(ctx, qb, &items)
if err != nil {
return nil, fmt.Errorf("can not get items from ddb: %w", err)
}
found := make(map[string]bool)
for i := 0; i < len(items); i++ {
found[items[i].Key] = true
element := resultMap.NewElement()
err = Unmarshal([]byte(items[i].Value), element)
if err != nil {
return nil, fmt.Errorf("can not unmarshal item: %w", err)
}
keyOrig := keyMapToOriginal[items[i].Key]
if err := resultMap.Set(keyOrig, element); err != nil {
return nil, fmt.Errorf("can not set new element on result map: %w", err)
}
}
missing := make([]interface{}, 0)
for i, key := range keyStrings {
if !found[key] {
missing = append(missing, keys[i])
}
}
return missing, nil
}
func (s *ddbKvStore[T]) Put(ctx context.Context, key any, value T) error {
keyStr, err := CastKeyToString(key)
if err != nil {
return fmt.Errorf("can not cast key %T %v to string: %w", key, key, err)
}
bytes, err := Marshal(value)
if err != nil {
return fmt.Errorf("can not marshal value %s: %w", keyStr, err)
}
item := &DdbItem{
Key: keyStr,
Value: string(bytes),
}
_, err = s.repository.PutItem(ctx, nil, item)
if err != nil {
return fmt.Errorf("can not put item %s into ddb store: %w", keyStr, err)
}
return nil
}
func (s *ddbKvStore[T]) PutBatch(ctx context.Context, values any) error {
mii, err := refl.InterfaceToMapInterfaceInterface(values)
if err != nil {
return fmt.Errorf("could not convert values to map[interface{}]interface{}")
}
keyStrings := make([]string, 0, len(mii))
keyMap := make(map[string]interface{})
for k := range mii {
keyStr, err := CastKeyToString(k)
if err != nil {
return fmt.Errorf("can not cast key %T %v to string: %w", k, k, err)
}
keyStrings = append(keyStrings, keyStr)
keyMap[keyStr] = k
}
sort.Strings(keyStrings)
items := make([]DdbItem, 0, len(mii))
for _, keyStr := range keyStrings {
key := keyMap[keyStr]
value := mii[key]
bytes, err := Marshal(value)
if err != nil {
return fmt.Errorf("can not marshal value %s: %w", keyStr, err)
}
item := DdbItem{
Key: keyStr,
Value: string(bytes),
}
items = append(items, item)
}
_, err = s.repository.BatchPutItems(ctx, items)
if err != nil {
return fmt.Errorf("not able to put values into ddb store: %w", err)
}
return nil
}
func (s *ddbKvStore[T]) Delete(ctx context.Context, key any) error {
keyStr, err := CastKeyToString(key)
if err != nil {
return fmt.Errorf("can not cast key %T %v to string: %w", key, key, err)
}
_, err = s.repository.DeleteItem(ctx, nil, &DdbDeleteItem{
Key: keyStr,
})
if err != nil {
return fmt.Errorf("can not delete item %s from ddb store: %w", keyStr, err)
}
return nil
}
func (s *ddbKvStore[T]) DeleteBatch(ctx context.Context, keys any) error {
si, err := refl.InterfaceToInterfaceSlice(keys)
if err != nil {
return fmt.Errorf("could not convert keys from %T to []interface{}: %w", keys, err)
}
items := make([]*DdbDeleteItem, len(si))
for i, key := range si {
keyStr, err := CastKeyToString(key)
if err != nil {
return fmt.Errorf("can not cast key %T %v to string: %w", key, key, err)
}
items[i] = &DdbDeleteItem{
Key: keyStr,
}
}
_, err = s.repository.BatchDeleteItems(ctx, items)
if err != nil {
return fmt.Errorf("can not delete values from ddb store: %w", err)
}
return nil
}