"encoding/base64"
"errors"
"fmt"
+ "hash/crc32"
"io"
"reflect"
"strings"
eventSeparator string
mutex sync.Mutex
tmp []byte
- iDatabase
+ db *Database
}
//NewSyncStorage creates a new sdl instance.
func newSyncStorage(db *Database) *SyncStorage {
return &SyncStorage{
eventSeparator: "___",
- iDatabase: db.instance,
+ db: db,
}
}
+//selectDbInstance Selects DB instance what provides DB services for the namespace
+func (s *SyncStorage) getDbBackend(ns string) iDatabase {
+ instanceCount := uint32(len(s.db.instances))
+ instanceID := getHash(ns) % instanceCount
+ return s.db.instances[instanceID]
+}
+
+//getHash Returns hash value calculated from the string
+func getHash(s string) uint32 {
+ tbl := crc32.MakeTable(crc32.IEEE)
+ return crc32.Checksum([]byte(s), tbl)
+}
+
//SubscribeChannel lets you to subscribe for a events on a given channels.
//SDL notifications are events that are published on a specific channels.
//Both the channel and events are defined by the entity that is publishing
//events received from different channels, callbacks are called in series one by one.
func (s *SyncStorage) SubscribeChannel(ns string, cb func(string, ...string), channels ...string) error {
nsPrefix := getNsPrefix(ns)
- s.SubscribeChannelDB(cb, nsPrefix, s.eventSeparator, s.setNamespaceToChannels(nsPrefix, channels...)...)
+ s.getDbBackend(ns).SubscribeChannelDB(cb, nsPrefix, s.eventSeparator, s.setNamespaceToChannels(nsPrefix, channels...)...)
return nil
}
//namespace.
func (s *SyncStorage) UnsubscribeChannel(ns string, channels ...string) error {
nsPrefix := getNsPrefix(ns)
- s.UnsubscribeChannelDB(s.setNamespaceToChannels(nsPrefix, channels...)...)
+ s.getDbBackend(ns).UnsubscribeChannelDB(s.setNamespaceToChannels(nsPrefix, channels...)...)
return nil
}
//Close connection to backend database.
func (s *SyncStorage) Close() error {
- return s.CloseDB()
+ var ret error
+ for _, db := range s.db.instances {
+ if err := db.CloseDB(); err != nil {
+ ret = err
+ }
+ }
+ return ret
}
func (s *SyncStorage) checkChannelsAndEvents(cmd string, channelsAndEvents []string) error {
return err
}
if len(channelsAndEvents) == 0 {
- return s.MSet(keyAndData...)
+ return s.getDbBackend(ns).MSet(keyAndData...)
}
if err := s.checkChannelsAndEvents("SetAndPublish", channelsAndEvents); err != nil {
return err
}
channelsAndEventsPrepared := s.prepareChannelsAndEvents(nsPrefix, channelsAndEvents)
- return s.MSetMPub(channelsAndEventsPrepared, keyAndData...)
+ return s.getDbBackend(ns).MSetMPub(channelsAndEventsPrepared, keyAndData...)
}
//Set function writes data to shared data layer storage. Writing is done
if err != nil {
return err
}
- return s.MSet(keyAndData...)
+ return s.getDbBackend(ns).MSet(keyAndData...)
}
//Get function atomically reads one or more keys from SDL. The returned map has the
for _, v := range keys {
keysWithNs = append(keysWithNs, getNsPrefix(ns)+v)
}
- val, err := s.MGet(keysWithNs)
+ val, err := s.getDbBackend(ns).MGet(keysWithNs)
if err != nil {
return m, err
}
func (s *SyncStorage) SetIfAndPublish(ns string, channelsAndEvents []string, key string, oldData, newData interface{}) (bool, error) {
nsPrefix := getNsPrefix(ns)
if len(channelsAndEvents) == 0 {
- return s.SetIE(nsPrefix+key, oldData, newData)
+ return s.getDbBackend(ns).SetIE(nsPrefix+key, oldData, newData)
}
if err := s.checkChannelsAndEvents("SetIfAndPublish", channelsAndEvents); err != nil {
return false, err
}
channelsAndEventsPrepared := s.prepareChannelsAndEvents(nsPrefix, channelsAndEvents)
- return s.SetIEPub(channelsAndEventsPrepared, nsPrefix+key, oldData, newData)
+ return s.getDbBackend(ns).SetIEPub(channelsAndEventsPrepared, nsPrefix+key, oldData, newData)
}
//SetIf atomically replaces existing data with newData in SDL if data matches the oldData.
//If replace was done successfully, true will be returned.
//Data is written under the namespace what is given as a parameter for this function.
func (s *SyncStorage) SetIf(ns string, key string, oldData, newData interface{}) (bool, error) {
- return s.SetIE(getNsPrefix(ns)+key, oldData, newData)
+ return s.getDbBackend(ns).SetIE(getNsPrefix(ns)+key, oldData, newData)
}
//SetIfNotExistsAndPublish conditionally sets the value of a key. If key already exists in SDL,
func (s *SyncStorage) SetIfNotExistsAndPublish(ns string, channelsAndEvents []string, key string, data interface{}) (bool, error) {
nsPrefix := getNsPrefix(ns)
if len(channelsAndEvents) == 0 {
- return s.SetNX(nsPrefix+key, data, 0)
+ return s.getDbBackend(ns).SetNX(nsPrefix+key, data, 0)
}
if err := s.checkChannelsAndEvents("SetIfNotExistsAndPublish", channelsAndEvents); err != nil {
return false, err
}
channelsAndEventsPrepared := s.prepareChannelsAndEvents(nsPrefix, channelsAndEvents)
- return s.SetNXPub(channelsAndEventsPrepared, nsPrefix+key, data)
+ return s.getDbBackend(ns).SetNXPub(channelsAndEventsPrepared, nsPrefix+key, data)
}
//SetIfNotExists conditionally sets the value of a key. If key already exists in SDL,
//is done atomically.
//Data is written under the namespace what is given as a parameter for this function.
func (s *SyncStorage) SetIfNotExists(ns string, key string, data interface{}) (bool, error) {
- return s.SetNX(getNsPrefix(ns)+key, data, 0)
+ return s.getDbBackend(ns).SetNX(getNsPrefix(ns)+key, data, 0)
}
//RemoveAndPublish removes data from SDL. Operation is done atomically, i.e. either all succeeds or fails.
keysWithNs = append(keysWithNs, nsPrefix+v)
}
if len(channelsAndEvents) == 0 {
- return s.Del(keysWithNs)
+ return s.getDbBackend(ns).Del(keysWithNs)
}
if err := s.checkChannelsAndEvents("RemoveAndPublish", channelsAndEvents); err != nil {
return err
}
channelsAndEventsPrepared := s.prepareChannelsAndEvents(nsPrefix, channelsAndEvents)
- return s.DelMPub(channelsAndEventsPrepared, keysWithNs)
+ return s.getDbBackend(ns).DelMPub(channelsAndEventsPrepared, keysWithNs)
}
//Remove data from SDL. Operation is done atomically, i.e. either all succeeds or fails.
for _, v := range keys {
keysWithNs = append(keysWithNs, getNsPrefix(ns)+v)
}
- err := s.Del(keysWithNs)
+ err := s.getDbBackend(ns).Del(keysWithNs)
return err
}
func (s *SyncStorage) RemoveIfAndPublish(ns string, channelsAndEvents []string, key string, data interface{}) (bool, error) {
nsPrefix := getNsPrefix(ns)
if len(channelsAndEvents) == 0 {
- return s.DelIE(nsPrefix+key, data)
+ return s.getDbBackend(ns).DelIE(nsPrefix+key, data)
}
if err := s.checkChannelsAndEvents("RemoveIfAndPublish", channelsAndEvents); err != nil {
return false, err
}
channelsAndEventsPrepared := s.prepareChannelsAndEvents(nsPrefix, channelsAndEvents)
- return s.DelIEPub(channelsAndEventsPrepared, nsPrefix+key, data)
+ return s.getDbBackend(ns).DelIEPub(channelsAndEventsPrepared, nsPrefix+key, data)
}
//RemoveIf removes data from SDL conditionally. If existing data matches given data,
//key and data are removed from SDL. If remove was done successfully, true is returned.
//Data is removed under the namespace what is given as a parameter for this function.
func (s *SyncStorage) RemoveIf(ns string, key string, data interface{}) (bool, error) {
- status, err := s.DelIE(getNsPrefix(ns)+key, data)
+ status, err := s.getDbBackend(ns).DelIE(getNsPrefix(ns)+key, data)
if err != nil {
return false, err
}
//given namespace exists, thus operation is not guaranteed to be atomic or isolated.
func (s *SyncStorage) GetAll(ns string) ([]string, error) {
nsPrefix := getNsPrefix(ns)
- keys, err := s.Keys(nsPrefix + "*")
+ keys, err := s.getDbBackend(ns).Keys(nsPrefix + "*")
var retVal []string
if err != nil {
return retVal, err
//RemoveAll removes all keys under the namespace. Remove operation is not atomic, thus
//it is not guaranteed that all keys are removed.
func (s *SyncStorage) RemoveAll(ns string) error {
- keys, err := s.Keys(getNsPrefix(ns) + "*")
+ keys, err := s.getDbBackend(ns).Keys(getNsPrefix(ns) + "*")
if err != nil {
return err
}
if (keys != nil) && (len(keys) != 0) {
- err = s.Del(keys)
+ err = s.getDbBackend(ns).Del(keys)
}
return err
}
//not guaranteed that all keys are removed.
func (s *SyncStorage) RemoveAllAndPublish(ns string, channelsAndEvents []string) error {
nsPrefix := getNsPrefix(ns)
- keys, err := s.Keys(nsPrefix + "*")
+ keys, err := s.getDbBackend(ns).Keys(nsPrefix + "*")
if err != nil {
return err
}
if (keys != nil) && (len(keys) != 0) {
if len(channelsAndEvents) == 0 {
- return s.Del(keys)
+ return s.getDbBackend(ns).Del(keys)
}
if err := s.checkChannelsAndEvents("RemoveAllAndPublish", channelsAndEvents); err != nil {
return err
}
channelsAndEventsPrepared := s.prepareChannelsAndEvents(nsPrefix, channelsAndEvents)
- err = s.DelMPub(channelsAndEventsPrepared, keys)
+ err = s.getDbBackend(ns).DelMPub(channelsAndEventsPrepared, keys)
}
return err
}
//unique. It is possible to add the same member several times without the
//need to check if it already exists.
func (s *SyncStorage) AddMember(ns string, group string, member ...interface{}) error {
- return s.SAdd(getNsPrefix(ns)+group, member...)
+ return s.getDbBackend(ns).SAdd(getNsPrefix(ns)+group, member...)
}
//RemoveMember removes members from a group under given namespace.
func (s *SyncStorage) RemoveMember(ns string, group string, member ...interface{}) error {
- return s.SRem(getNsPrefix(ns)+group, member...)
+ return s.getDbBackend(ns).SRem(getNsPrefix(ns)+group, member...)
}
//RemoveGroup removes the whole group along with it's members under given namespace.
func (s *SyncStorage) RemoveGroup(ns string, group string) error {
- return s.Del([]string{getNsPrefix(ns) + group})
+ return s.getDbBackend(ns).Del([]string{getNsPrefix(ns) + group})
}
//GetMembers returns all the members from a group under given namespace.
func (s *SyncStorage) GetMembers(ns string, group string) ([]string, error) {
- retVal, err := s.SMembers(getNsPrefix(ns) + group)
+ retVal, err := s.getDbBackend(ns).SMembers(getNsPrefix(ns) + group)
if err != nil {
return []string{}, err
}
//IsMember returns true if given member is found from a group under given namespace.
func (s *SyncStorage) IsMember(ns string, group string, member interface{}) (bool, error) {
- retVal, err := s.SIsMember(getNsPrefix(ns)+group, member)
+ retVal, err := s.getDbBackend(ns).SIsMember(getNsPrefix(ns)+group, member)
if err != nil {
return false, err
}
//GroupSize returns the number of members in a group under given namespace.
func (s *SyncStorage) GroupSize(ns string, group string) (int64, error) {
- retVal, err := s.SCard(getNsPrefix(ns) + group)
+ retVal, err := s.getDbBackend(ns).SCard(getNsPrefix(ns) + group)
if err != nil {
return 0, err
}
var retryTimer *time.Timer
for i, attempts := 0, opt.getRetryCount()+1; i < attempts; i++ {
- ok, err := s.SetNX(getNsPrefix(ns)+resource, value, expiration)
+ ok, err := s.getDbBackend(ns).SetNX(getNsPrefix(ns)+resource, value, expiration)
if err != nil {
return nil, err
} else if ok {
//is already expired or some other instance is keeping the lock (lock taken after
//expiration), an error is returned.
func (l *SyncStorageLock) ReleaseResource(ns string) error {
- ok, err := l.s.DelIE(getNsPrefix(ns)+l.key, l.value)
+ ok, err := l.s.getDbBackend(ns).DelIE(getNsPrefix(ns)+l.key, l.value)
if err != nil {
return err
//resource lock (if the lock still exists) under given namespace. The old
//remaining expiration time is overwritten with the given new expiration time.
func (l *SyncStorageLock) RefreshResource(ns string, expiration time.Duration) error {
- err := l.s.PExpireIE(getNsPrefix(ns)+l.key, l.value, expiration)
+ err := l.s.getDbBackend(ns).PExpireIE(getNsPrefix(ns)+l.key, l.value, expiration)
return err
}
//CheckResource returns the expiration time left for a resource under given
//namespace. If the resource doesn't exist, -2 is returned.
func (s *SyncStorage) CheckResource(ns string, resource string) (time.Duration, error) {
- result, err := s.PTTL(getNsPrefix(ns) + resource)
+ result, err := s.getDbBackend(ns).PTTL(getNsPrefix(ns) + resource)
if err != nil {
return 0, err
}
Code Review / ric-plt / sdlgo.git / blobdiff