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redis.go
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redis.go
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package kvstore
import (
"context"
"fmt"
"reflect"
"strings"
"github.com/justtrackio/gosoline/pkg/cfg"
"github.com/justtrackio/gosoline/pkg/log"
"github.com/justtrackio/gosoline/pkg/redis"
"github.com/justtrackio/gosoline/pkg/refl"
)
type redisKvStore[T any] struct {
client redis.Client
settings *Settings
}
func RedisBasename(settings *Settings) string {
return fmt.Sprintf("kvstore-%s", settings.Name)
}
func NewRedisKvStore[T any](_ 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)
redisName := RedisBasename(settings)
client, err := redis.ProvideClient(config, logger, redisName)
if err != nil {
return nil, fmt.Errorf("can not create redis client: %w", err)
}
return NewRedisKvStoreWithInterfaces[T](client, settings), nil
}
func NewRedisKvStoreWithInterfaces[T any](client redis.Client, settings *Settings) KvStore[T] {
return NewMetricStoreWithInterfaces[T](&redisKvStore[T]{
client: client,
settings: settings,
}, settings)
}
func (s *redisKvStore[T]) Contains(ctx context.Context, key any) (bool, error) {
keyStr, err := s.key(key)
if err != nil {
return false, fmt.Errorf("can not get key to check value in redis: %w", err)
}
count, err := s.client.Exists(ctx, keyStr)
if err != nil {
return false, fmt.Errorf("can not check existence in redis store: %w", err)
}
return count > 0, nil
}
func (s *redisKvStore[T]) Get(ctx context.Context, key any, value *T) (bool, error) {
keyStr, err := s.key(key)
if err != nil {
return false, fmt.Errorf("can not get key to read value from redis: %w", err)
}
data, err := s.client.Get(ctx, keyStr)
if err == redis.Nil {
return false, nil
}
if err != nil {
return false, fmt.Errorf("can not get value from redis store: %w", err)
}
err = Unmarshal([]byte(data), value)
if err != nil {
return false, fmt.Errorf("can not unmarshal value from redis store: %w", err)
}
return true, nil
}
func (s *redisKvStore[T]) GetBatch(ctx context.Context, keys any, result any) ([]interface{}, error) {
return getBatch(ctx, keys, result, s.getChunk, s.settings.BatchSize)
}
func (s *redisKvStore[T]) getChunk(ctx context.Context, resultMap *refl.Map, keys []interface{}) ([]interface{}, error) {
var err error
missing := make([]interface{}, 0)
keyStrings := make([]string, len(keys))
for i := 0; i < len(keyStrings); i++ {
keyStrings[i], err = s.key(keys[i])
if err != nil {
return nil, fmt.Errorf("can not build string key: %w", err)
}
}
items, err := s.client.MGet(ctx, keyStrings...)
if err != nil {
return nil, fmt.Errorf("can not get batch from redis: %w", err)
}
// redis returns nil if a key is missing, otherwise we don't know which value is missing
if len(items) != len(keys) {
return nil, fmt.Errorf("count of returned items does not match key count %d != %d", len(items), len(keys))
}
for i, item := range items {
item, ok := item.(string)
if !ok {
missing = append(missing, keys[i])
continue
}
element := resultMap.NewElement()
err = Unmarshal([]byte(item), element)
if err != nil {
return nil, fmt.Errorf("can not unmarshal item: %w", err)
}
if err := resultMap.Set(keys[i], element); err != nil {
return nil, fmt.Errorf("can not set new element on result map: %w", err)
}
}
return missing, nil
}
func (s *redisKvStore[T]) Put(ctx context.Context, key any, value T) error {
keyStr, bytes, err := s.marshalKeyValue(key, value)
if err != nil {
return fmt.Errorf("can not get key/value to write to redis: %w", err)
}
err = s.client.Set(ctx, keyStr, bytes, s.settings.Ttl)
if err != nil {
return fmt.Errorf("can not set value in redis store: %w", err)
}
return nil
}
func (s *redisKvStore[T]) marshalKeyValue(key any, value any) (string, []byte, error) {
bytes, err := Marshal(value)
if err != nil {
return "", nil, fmt.Errorf("can not marshal value %T %v: %w", value, value, err)
}
keyStr, err := s.key(key)
if err != nil {
return "", nil, fmt.Errorf("can not get key to write value to redis: %w", err)
}
return keyStr, bytes, nil
}
func (s *redisKvStore[T]) PutBatch(ctx context.Context, values any) error {
mii, err := refl.InterfaceToMapInterfaceInterface(values)
if err != nil {
return fmt.Errorf("could not convert values from %T to map[interface{}]interface{}", values)
}
chunkSize := s.settings.BatchSize
pairs := make([]interface{}, 0, 2*chunkSize)
for k, v := range mii {
key, value, err := s.marshalKeyValue(k, v)
if err != nil {
return fmt.Errorf("PutBatch could not marshal key/value: %w", err)
}
pairs = append(pairs, key, value)
if len(pairs) >= 2*chunkSize {
err = s.flushChunk(ctx, pairs)
if err != nil {
return fmt.Errorf("failed to write batch to redis: %w", err)
}
pairs = make([]interface{}, 0, chunkSize)
}
}
return s.flushChunk(ctx, pairs)
}
func (s *redisKvStore[T]) flushChunk(ctx context.Context, pairs []any) error {
if len(pairs) < 1 {
return nil
}
pipe := s.client.Pipeline().TxPipeline()
pipe.MSet(ctx, pairs)
// setting ttl
if s.settings.Ttl != 0 {
for i := 0; i < len(pairs); i += 2 {
keyStr, ok := pairs[i].(string)
if !ok {
return fmt.Errorf("setting ttl, failed to cast key to string: %v", pairs[i])
}
pipe.Expire(ctx, keyStr, s.settings.Ttl)
}
}
_, err := pipe.Exec(ctx)
return err
}
func (s *redisKvStore[T]) EstimateSize() *int64 {
size, err := s.client.DBSize(context.Background())
if err != nil {
return nil
}
return &size
}
func (s *redisKvStore[T]) Delete(ctx context.Context, key any) error {
keyStr, err := s.key(key)
if err != nil {
return fmt.Errorf("can not get key to delete value from redis: %w", err)
}
_, err = s.client.Del(ctx, keyStr)
if err != nil {
return fmt.Errorf("can not delete value from redis store: %w", err)
}
return nil
}
func (s *redisKvStore[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)
}
redisKeys := make([]string, len(si))
for i, key := range si {
keyStr, err := s.key(key)
if err != nil {
return fmt.Errorf("can not get key to delete value from redis: %w", err)
}
redisKeys[i] = keyStr
}
_, err = s.client.Del(ctx, redisKeys...)
if err != nil {
return fmt.Errorf("can not delete values from redis store: %w", err)
}
return nil
}
func (s *redisKvStore[T]) key(key any) (string, error) {
keyStr, err := CastKeyToString(key)
if err != nil {
return "", fmt.Errorf("can not cast key %T %v to string: %w", key, key, err)
}
keyStr = strings.Join([]string{
s.settings.Project,
s.settings.Family,
s.settings.Group,
"kvstore",
s.settings.Name,
keyStr,
}, "-")
return keyStr, nil
}