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memcached.go
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memcached.go
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package memcached
import (
"errors"
"fmt"
"strconv"
"strings"
"time"
"github.com/bradfitz/gomemcache/memcache"
"github.com/dapr/components-contrib/state"
"github.com/dapr/components-contrib/state/utils"
"github.com/dapr/kit/logger"
jsoniter "github.com/json-iterator/go"
)
const (
hosts = "hosts"
maxIdleConnections = "maxIdleConnections"
timeout = "timeout"
ttlInSeconds = "ttlInSeconds"
// These defaults are already provided by gomemcache
defaultMaxIdleConnections = 2
defaultTimeout = 1000 * time.Millisecond
)
type Memcached struct {
state.DefaultBulkStore
client *memcache.Client
json jsoniter.API
logger logger.Logger
}
type memcachedMetadata struct {
hosts []string
maxIdleConnections int
timeout time.Duration
}
func NewMemCacheStateStore(logger logger.Logger) *Memcached {
s := &Memcached{
json: jsoniter.ConfigFastest,
logger: logger,
}
s.DefaultBulkStore = state.NewDefaultBulkStore(s)
return s
}
func (m *Memcached) Init(metadata state.Metadata) error {
meta, err := getMemcachedMetadata(metadata)
if err != nil {
return err
}
client := memcache.New(meta.hosts...)
client.Timeout = meta.timeout
client.MaxIdleConns = meta.maxIdleConnections
m.client = client
err = client.Ping()
if err != nil {
return err
}
return nil
}
// Features returns the features available in this state store
func (m *Memcached) Features() []state.Feature {
return nil
}
func getMemcachedMetadata(metadata state.Metadata) (*memcachedMetadata, error) {
meta := memcachedMetadata{
maxIdleConnections: defaultMaxIdleConnections,
timeout: defaultTimeout,
}
if val, ok := metadata.Properties[hosts]; ok && val != "" {
meta.hosts = strings.Split(val, ",")
} else {
return nil, errors.New("missing or empty hosts field from metadata")
}
if val, ok := metadata.Properties[maxIdleConnections]; ok && val != "" {
p, err := strconv.Atoi(val)
if err != nil {
return nil, fmt.Errorf("error parsing maxIdleConnections")
}
meta.maxIdleConnections = p
}
if val, ok := metadata.Properties[timeout]; ok && val != "" {
p, err := strconv.Atoi(val)
if err != nil {
return nil, fmt.Errorf("error parsing timeout")
}
meta.timeout = time.Duration(p) * time.Millisecond
}
return &meta, nil
}
func (m *Memcached) parseTTL(req *state.SetRequest) (*int32, error) {
if val, ok := req.Metadata[ttlInSeconds]; ok && val != "" {
parsedVal, err := strconv.ParseInt(val, 10, 0)
if err != nil {
return nil, err
}
parsedInt := int32(parsedVal)
return &parsedInt, nil
}
return nil, nil
}
func (m *Memcached) setValue(req *state.SetRequest) error {
var bt []byte
ttl, err := m.parseTTL(req)
if err != nil {
return fmt.Errorf("failed to parse ttl %s: %s", req.Key, err)
}
bt, _ = utils.Marshal(req.Value, m.json.Marshal)
if ttl != nil {
err = m.client.Set(&memcache.Item{Key: req.Key, Value: bt, Expiration: *ttl})
} else {
err = m.client.Set(&memcache.Item{Key: req.Key, Value: bt})
}
if err != nil {
return fmt.Errorf("failed to set key %s: %s", req.Key, err)
}
return nil
}
func (m *Memcached) Delete(req *state.DeleteRequest) error {
err := m.client.Delete(req.Key)
if err != nil {
return err
}
return nil
}
func (m *Memcached) Get(req *state.GetRequest) (*state.GetResponse, error) {
item, err := m.client.Get(req.Key)
if err != nil {
// Return nil for status 204
if errors.Is(err, memcache.ErrCacheMiss) {
return &state.GetResponse{}, nil
}
return &state.GetResponse{}, err
}
return &state.GetResponse{
Data: item.Value,
}, nil
}
func (m *Memcached) Set(req *state.SetRequest) error {
return state.SetWithOptions(m.setValue, req)
}
func (m *Memcached) Ping() error {
return nil
}