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commands.go
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commands.go
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package iqdb
import (
"sync"
"time"
)
// Get value by key
// Returns value in string on success and error on failure
func (iq *IqDB) Get(key string) (string, error) {
v, err := iq.distmap.Get(key)
if err != nil {
return "", err
}
if v.dataType != dataTypeKV {
return "", ErrKeyTypeError
}
return v.Value, nil
}
// Set value by key. TTl is optional parameter
// Returns error on fail
func (iq *IqDB) Set(key, value string, ttl ...time.Duration) error {
var t time.Duration
if ttl != nil && ttl[0] > 0 {
t = ttl[0]
}
err := iq.set(key, value, t, true)
if err != nil {
return err
}
err = iq.writeSet(key, value, t)
return err
}
func (iq *IqDB) set(key, value string, ttl time.Duration, lock bool) error {
kv := &KV{dataType: dataTypeKV, Value: value}
if ttl > 0 {
kv.ttl = ttl
}
err := iq.distmap.Set(key, kv)
if err != nil {
return err
}
if ttl > 0 {
iq.ttl.ReplaceOrInsert(NewttlTreeItem(key, ttl))
} else if iq.opts.TTL > 0 {
iq.ttl.ReplaceOrInsert(NewttlTreeItem(key, iq.opts.TTL))
}
return nil
}
// Removes key from storage
// Returns error on fail
func (iq *IqDB) Remove(key string) error {
err := iq.remove(key, true)
err = iq.writeRemove(key)
return err
}
func (iq *IqDB) remove(key string, lock bool) error {
v, err := iq.distmap.Get(key)
if err != nil {
return err
}
iq.distmap.Remove(key)
if v.ttl > 0 {
iq.ttl.Delete(&ttlTreeItem{ttl: v.ttl, key: key})
}
return nil
}
func (iq *IqDB) removeFromHash(key string) error {
iq.distmap.Remove(key)
return nil
}
// Set TTL on key
// Returns error on fail
func (iq *IqDB) TTL(key string, ttl time.Duration) error {
err := iq._ttl(key, ttl, true)
err = iq.writeTTL(key, ttl)
return err
}
func (iq *IqDB) _ttl(key string, ttl time.Duration, lock bool) error {
v, err := iq.distmap.Get(key)
if err != nil {
return err
}
if v.ttl == ttl || ttl == 0 {
return nil
}
v.ttl = ttl
iq.ttl.ReplaceOrInsert(NewttlTreeItem(key, ttl))
return nil
}
// Get all keys
// Returns string channel with keys
func (iq *IqDB) Keys() chan<- string {
return iq.distmap.Range()
}
func (iq *IqDB) Type(key string) (int, error) {
v, err := iq.distmap.Get(key)
if err != nil {
return 0, err
}
return v.dataType, nil
}
// Lists
// Helper method to obtain and check data type
func (iq *IqDB) list(key string) (*list, error) {
v, err := iq.distmap.Get(key)
if err != nil {
return nil, err
}
if v.dataType != dataTypeList {
return nil, ErrKeyTypeError
}
return v.list, nil
}
// Get list length
// Returns items count on success and error on fail
func (iq *IqDB) ListLen(key string) (int, error) {
v, err := iq.list(key)
if err != nil {
return 0, err
}
return len(v.list), nil
}
// Get list item by its index
// Returns item on success and error on fail
func (iq *IqDB) ListIndex(key string, index int) (string, error) {
v, err := iq.list(key)
if err != nil {
return "", err
}
if len(v.list) <= index {
return "", ErrListIndexError
}
return v.list[index], nil
}
// Push item to end of list
// Returns items count on success and error on fail
func (iq *IqDB) ListPush(key string, value ...string) (int, error) {
l, err := iq.listPush(key, value, true)
err = iq.writeListPush(key, value...)
return l, err
}
func (iq *IqDB) listPush(key string, value []string, lock bool) (int, error) {
v, err := iq.list(key)
if err != nil && err != ErrKeyNotFound {
return 0, err
} else if err == ErrKeyNotFound {
l, err := iq.newList(key)
if err != nil {
return 0, err
}
v = l.list
}
v.mx.Lock()
defer v.mx.Unlock()
for _, val := range value {
v.list = append(v.list, val)
}
return len(v.list), nil
}
// Pop item from end of list
// Returns items count on success and error on fail
func (iq *IqDB) ListPop(key string) (int, error) {
l, err := iq.listPop(key, true)
if err != nil {
return 0, err
}
err = iq.writeListPop(key)
return l, err
}
func (iq *IqDB) listPop(key string, lock bool) (int, error) {
v, err := iq.list(key)
if err != nil {
return 0, err
}
v.mx.Lock()
defer v.mx.Unlock()
l := len(v.list)
if l == 0 {
return 0, nil
}
v.list = v.list[0 : l-1]
return len(v.list), nil
}
// Get list items by key with specified index range
// Returns items slice on success and error on fail
func (iq *IqDB) ListRange(key string, from, to int) ([]string, error) {
v, err := iq.list(key)
if err != nil {
return nil, err
}
if from < 0 || len(v.list) < to || from > to {
return nil, ErrListOutOfBounds
}
return v.list[from : to+1], nil
}
// Hashes
func (iq *IqDB) hash(key string) (*hash, error) {
v, err := iq.distmap.Get(key)
if err != nil {
return nil, err
}
if v.dataType != dataTypeHash {
return nil, ErrKeyTypeError
}
return v.hash, nil
}
// Get hash value by key and field
// Returns value on success and error on fail
func (iq *IqDB) HashGet(key string, field string) (string, error) {
v, err := iq.hash(key)
if err != nil {
return "", err
}
if s, ok := v.hash.Load(field); ok {
return s.(string), nil
}
return "", ErrHashKeyNotFound
}
// Get hash fields and values map by key
// Returns map of fields and values on success and error on fail
func (iq *IqDB) HashGetAll(key string) (map[string]string, error) {
v, err := iq.hash(key)
if err != nil {
return nil, err
}
ret := make(map[string]string)
v.hash.Range(func(key, value interface{}) bool {
ret[key.(string)] = value.(string)
return true
})
return ret, nil
}
// Get hash keys of key
// Returns string slice of keys on success and error on fail
func (iq *IqDB) HashKeys(key string) ([]string, error) {
v, err := iq.hash(key)
if err != nil {
return nil, err
}
ret := make([]string, 0)
v.hash.Range(func(key, value interface{}) bool {
ret = append(ret, key.(string))
return true
})
return ret, nil
}
// Delete field from hash
// Returns error on fail
func (iq *IqDB) HashDel(key string, field string) error {
err := iq.hashDel(key, field, true)
if err != nil {
return err
}
err = iq.writeHashDel(key, field)
return err
}
func (iq *IqDB) hashDel(key, field string, lock bool) error {
v, err := iq.hash(key)
if err != nil {
return err
}
// redundant call
/*if _, ok := v.hash.Load(field); !ok {
return ErrHashKeyNotFound
}*/
v.hash.Delete(field)
return nil
}
// Set one or more field-value pairs on hash by key
// Example: HashSet("test","k1","v1","k2","v2")
// Returns error on fail
func (iq *IqDB) HashSet(key string, args ...string) error {
if len(args)%2 != 0 {
return ErrHashKeyValueMismatch
}
kv := make(map[string]string)
for i := 0; i < len(args); i += 2 {
kv[args[i]] = args[i+1]
}
err := iq.hashSet(key, kv, true)
if err != nil {
return err
}
err = iq.writeHashSet(key, args...)
return err
}
func (iq *IqDB) hashSet(key string, kv map[string]string, lock bool) error {
h, err := iq.hash(key)
if err != nil && err != ErrKeyNotFound {
return err
} else if err == ErrKeyNotFound {
nh, err := iq.newHash(key)
if err != nil {
return err
}
h = nh.hash
}
for k, v := range kv {
h.hash.Store(k, v)
}
return nil
}
func (iq *IqDB) newHash(key string) (*KV, error) {
kv := &KV{dataType: dataTypeHash, hash: &hash{&sync.Map{}}}
err := iq.distmap.Set(key, kv)
return kv, err
}
func (iq *IqDB) newList(key string) (*KV, error) {
kv := &KV{dataType: dataTypeList, list: &list{mx: &sync.RWMutex{}, list: make([]string, 0)}}
err := iq.distmap.Set(key, kv)
return kv, err
}
func (iq *IqDB) ForeTTLRecheck() {
iq.ttl.checkTTL()
}