commands.go

package redis

import (
	"io"
	"strconv"
	"time"

	"gopkg.in/redis.v5/internal"
)

func readTimeout(timeout time.Duration) time.Duration {
	if timeout == 0 {
		return 0
	}
	return timeout + time.Second
}

func usePrecise(dur time.Duration) bool {
	return dur < time.Second || dur%time.Second != 0
}

func formatMs(dur time.Duration) string {
	if dur > 0 && dur < time.Millisecond {
		internal.Logf(
			"specified duration is %s, but minimal supported value is %s",
			dur, time.Millisecond,
		)
	}
	return strconv.FormatInt(int64(dur/time.Millisecond), 10)
}

func formatSec(dur time.Duration) string {
	if dur > 0 && dur < time.Second {
		internal.Logf(
			"specified duration is %s, but minimal supported value is %s",
			dur, time.Second,
		)
	}
	return strconv.FormatInt(int64(dur/time.Second), 10)
}

type Cmdable interface {
	Pipeline() *Pipeline
	Pipelined(fn func(*Pipeline) error) ([]Cmder, error)

	Echo(message interface{}) *StringCmd
	Ping() *StatusCmd
	Quit() *StatusCmd
	Del(keys ...string) *IntCmd
	Dump(key string) *StringCmd
	Exists(key string) *BoolCmd
	Expire(key string, expiration time.Duration) *BoolCmd
	ExpireAt(key string, tm time.Time) *BoolCmd
	Keys(pattern string) *StringSliceCmd
	Migrate(host, port, key string, db int64, timeout time.Duration) *StatusCmd
	Move(key string, db int64) *BoolCmd
	ObjectRefCount(keys ...string) *IntCmd
	ObjectEncoding(keys ...string) *StringCmd
	ObjectIdleTime(keys ...string) *DurationCmd
	Persist(key string) *BoolCmd
	PExpire(key string, expiration time.Duration) *BoolCmd
	PExpireAt(key string, tm time.Time) *BoolCmd
	PTTL(key string) *DurationCmd
	RandomKey() *StringCmd
	Rename(key, newkey string) *StatusCmd
	RenameNX(key, newkey string) *BoolCmd
	Restore(key string, ttl time.Duration, value string) *StatusCmd
	RestoreReplace(key string, ttl time.Duration, value string) *StatusCmd
	Sort(key string, sort Sort) *StringSliceCmd
	SortInterfaces(key string, sort Sort) *SliceCmd
	TTL(key string) *DurationCmd
	Type(key string) *StatusCmd
	Scan(cursor uint64, match string, count int64) Scanner
	SScan(key string, cursor uint64, match string, count int64) Scanner
	HScan(key string, cursor uint64, match string, count int64) Scanner
	ZScan(key string, cursor uint64, match string, count int64) Scanner
	Append(key, value string) *IntCmd
	BitCount(key string, bitCount *BitCount) *IntCmd
	BitOpAnd(destKey string, keys ...string) *IntCmd
	BitOpOr(destKey string, keys ...string) *IntCmd
	BitOpXor(destKey string, keys ...string) *IntCmd
	BitOpNot(destKey string, key string) *IntCmd
	BitPos(key string, bit int64, pos ...int64) *IntCmd
	Decr(key string) *IntCmd
	DecrBy(key string, decrement int64) *IntCmd
	Get(key string) *StringCmd
	GetBit(key string, offset int64) *IntCmd
	GetRange(key string, start, end int64) *StringCmd
	GetSet(key string, value interface{}) *StringCmd
	Incr(key string) *IntCmd
	IncrBy(key string, value int64) *IntCmd
	IncrByFloat(key string, value float64) *FloatCmd
	MGet(keys ...string) *SliceCmd
	MSet(pairs ...interface{}) *StatusCmd
	MSetNX(pairs ...interface{}) *BoolCmd
	Set(key string, value interface{}, expiration time.Duration) *StatusCmd
	SetBit(key string, offset int64, value int) *IntCmd
	SetNX(key string, value interface{}, expiration time.Duration) *BoolCmd
	SetXX(key string, value interface{}, expiration time.Duration) *BoolCmd
	SetRange(key string, offset int64, value string) *IntCmd
	StrLen(key string) *IntCmd
	HDel(key string, fields ...string) *IntCmd
	HExists(key, field string) *BoolCmd
	HGet(key, field string) *StringCmd
	HGetAll(key string) *StringStringMapCmd
	HIncrBy(key, field string, incr int64) *IntCmd
	HIncrByFloat(key, field string, incr float64) *FloatCmd
	HKeys(key string) *StringSliceCmd
	HLen(key string) *IntCmd
	HMGet(key string, fields ...string) *SliceCmd
	HMSet(key string, fields map[string]string) *StatusCmd
	HSet(key, field, value string) *BoolCmd
	HSetNX(key, field, value string) *BoolCmd
	HVals(key string) *StringSliceCmd
	BLPop(timeout time.Duration, keys ...string) *StringSliceCmd
	BRPop(timeout time.Duration, keys ...string) *StringSliceCmd
	BRPopLPush(source, destination string, timeout time.Duration) *StringCmd
	LIndex(key string, index int64) *StringCmd
	LInsert(key, op string, pivot, value interface{}) *IntCmd
	LInsertBefore(key string, pivot, value interface{}) *IntCmd
	LInsertAfter(key string, pivot, value interface{}) *IntCmd
	LLen(key string) *IntCmd
	LPop(key string) *StringCmd
	LPush(key string, values ...interface{}) *IntCmd
	LPushX(key string, value interface{}) *IntCmd
	LRange(key string, start, stop int64) *StringSliceCmd
	LRem(key string, count int64, value interface{}) *IntCmd
	LSet(key string, index int64, value interface{}) *StatusCmd
	LTrim(key string, start, stop int64) *StatusCmd
	RPop(key string) *StringCmd
	RPopLPush(source, destination string) *StringCmd
	RPush(key string, values ...interface{}) *IntCmd
	RPushX(key string, value interface{}) *IntCmd
	SAdd(key string, members ...interface{}) *IntCmd
	SCard(key string) *IntCmd
	SDiff(keys ...string) *StringSliceCmd
	SDiffStore(destination string, keys ...string) *IntCmd
	SInter(keys ...string) *StringSliceCmd
	SInterStore(destination string, keys ...string) *IntCmd
	SIsMember(key string, member interface{}) *BoolCmd
	SMembers(key string) *StringSliceCmd
	SMove(source, destination string, member interface{}) *BoolCmd
	SPop(key string) *StringCmd
	SPopN(key string, count int64) *StringSliceCmd
	SRandMember(key string) *StringCmd
	SRandMemberN(key string, count int64) *StringSliceCmd
	SRem(key string, members ...interface{}) *IntCmd
	SUnion(keys ...string) *StringSliceCmd
	SUnionStore(destination string, keys ...string) *IntCmd
	ZAdd(key string, members ...Z) *IntCmd
	ZAddNX(key string, members ...Z) *IntCmd
	ZAddXX(key string, members ...Z) *IntCmd
	ZAddCh(key string, members ...Z) *IntCmd
	ZAddNXCh(key string, members ...Z) *IntCmd
	ZAddXXCh(key string, members ...Z) *IntCmd
	ZIncr(key string, member Z) *FloatCmd
	ZIncrNX(key string, member Z) *FloatCmd
	ZIncrXX(key string, member Z) *FloatCmd
	ZCard(key string) *IntCmd
	ZCount(key, min, max string) *IntCmd
	ZIncrBy(key string, increment float64, member string) *FloatCmd
	ZInterStore(destination string, store ZStore, keys ...string) *IntCmd
	ZRange(key string, start, stop int64) *StringSliceCmd
	ZRangeWithScores(key string, start, stop int64) *ZSliceCmd
	ZRangeByScore(key string, opt ZRangeBy) *StringSliceCmd
	ZRangeByLex(key string, opt ZRangeBy) *StringSliceCmd
	ZRangeByScoreWithScores(key string, opt ZRangeBy) *ZSliceCmd
	ZRank(key, member string) *IntCmd
	ZRem(key string, members ...interface{}) *IntCmd
	ZRemRangeByRank(key string, start, stop int64) *IntCmd
	ZRemRangeByScore(key, min, max string) *IntCmd
	ZRevRange(key string, start, stop int64) *StringSliceCmd
	ZRevRangeWithScores(key string, start, stop int64) *ZSliceCmd
	ZRevRangeByScore(key string, opt ZRangeBy) *StringSliceCmd
	ZRevRangeByLex(key string, opt ZRangeBy) *StringSliceCmd
	ZRevRangeByScoreWithScores(key string, opt ZRangeBy) *ZSliceCmd
	ZRevRank(key, member string) *IntCmd
	ZScore(key, member string) *FloatCmd
	ZUnionStore(dest string, store ZStore, keys ...string) *IntCmd
	PFAdd(key string, els ...interface{}) *IntCmd
	PFCount(keys ...string) *IntCmd
	PFMerge(dest string, keys ...string) *StatusCmd
	BgRewriteAOF() *StatusCmd
	BgSave() *StatusCmd
	ClientKill(ipPort string) *StatusCmd
	ClientList() *StringCmd
	ClientPause(dur time.Duration) *BoolCmd
	ClientSetName(name string) *BoolCmd
	ConfigGet(parameter string) *SliceCmd
	ConfigResetStat() *StatusCmd
	ConfigSet(parameter, value string) *StatusCmd
	DbSize() *IntCmd
	FlushAll() *StatusCmd
	FlushDb() *StatusCmd
	Info(section ...string) *StringCmd
	LastSave() *IntCmd
	Save() *StatusCmd
	Shutdown() *StatusCmd
	ShutdownSave() *StatusCmd
	ShutdownNoSave() *StatusCmd
	SlaveOf(host, port string) *StatusCmd
	Time() *TimeCmd
	Eval(script string, keys []string, args ...interface{}) *Cmd
	EvalSha(sha1 string, keys []string, args ...interface{}) *Cmd
	ScriptExists(scripts ...string) *BoolSliceCmd
	ScriptFlush() *StatusCmd
	ScriptKill() *StatusCmd
	ScriptLoad(script string) *StringCmd
	DebugObject(key string) *StringCmd
	PubSubChannels(pattern string) *StringSliceCmd
	PubSubNumSub(channels ...string) *StringIntMapCmd
	PubSubNumPat() *IntCmd
	ClusterSlots() *ClusterSlotsCmd
	ClusterNodes() *StringCmd
	ClusterMeet(host, port string) *StatusCmd
	ClusterForget(nodeID string) *StatusCmd
	ClusterReplicate(nodeID string) *StatusCmd
	ClusterResetSoft() *StatusCmd
	ClusterResetHard() *StatusCmd
	ClusterInfo() *StringCmd
	ClusterKeySlot(key string) *IntCmd
	ClusterCountFailureReports(nodeID string) *IntCmd
	ClusterCountKeysInSlot(slot int) *IntCmd
	ClusterDelSlots(slots ...int) *StatusCmd
	ClusterDelSlotsRange(min, max int) *StatusCmd
	ClusterSaveConfig() *StatusCmd
	ClusterSlaves(nodeID string) *StringSliceCmd
	ClusterFailover() *StatusCmd
	ClusterAddSlots(slots ...int) *StatusCmd
	ClusterAddSlotsRange(min, max int) *StatusCmd
	GeoAdd(key string, geoLocation ...*GeoLocation) *IntCmd
	GeoPos(key string, members ...string) *GeoPosCmd
	GeoRadius(key string, longitude, latitude float64, query *GeoRadiusQuery) *GeoLocationCmd
	GeoRadiusByMember(key, member string, query *GeoRadiusQuery) *GeoLocationCmd
	GeoDist(key string, member1, member2, unit string) *FloatCmd
	GeoHash(key string, members ...string) *StringSliceCmd
	Command() *CommandsInfoCmd
}

type cmdable struct {
	process func(cmd Cmder) error
}

// WrapProcess replaces the process func. It takes a function createWrapper
// which is supplied by the user. createWrapper takes the old process func as
// an input and returns the new wrapper process func. createWrapper should
// use call the old process func within the new process func.
func (c *cmdable) WrapProcess(createWrapper func(oldProcess func(cmd Cmder) error) func(cmd Cmder) error) {
	c.process = createWrapper(c.process)
}

type statefulCmdable struct {
	process func(cmd Cmder) error
}

//------------------------------------------------------------------------------

func (c *statefulCmdable) Auth(password string) *StatusCmd {
	cmd := NewStatusCmd("auth", password)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Echo(message interface{}) *StringCmd {
	cmd := NewStringCmd("echo", message)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Ping() *StatusCmd {
	cmd := NewStatusCmd("ping")
	c.process(cmd)
	return cmd
}

func (c *cmdable) Quit() *StatusCmd {
	panic("not implemented")
}

func (c *statefulCmdable) Select(index int) *StatusCmd {
	cmd := NewStatusCmd("select", index)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) Del(keys ...string) *IntCmd {
	args := make([]interface{}, 1+len(keys))
	args[0] = "del"
	for i, key := range keys {
		args[1+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Dump(key string) *StringCmd {
	cmd := NewStringCmd("dump", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Exists(key string) *BoolCmd {
	cmd := NewBoolCmd("exists", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Expire(key string, expiration time.Duration) *BoolCmd {
	cmd := NewBoolCmd("expire", key, formatSec(expiration))
	c.process(cmd)
	return cmd
}

func (c *cmdable) ExpireAt(key string, tm time.Time) *BoolCmd {
	cmd := NewBoolCmd("expireat", key, tm.Unix())
	c.process(cmd)
	return cmd
}

func (c *cmdable) Keys(pattern string) *StringSliceCmd {
	cmd := NewStringSliceCmd("keys", pattern)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Migrate(host, port, key string, db int64, timeout time.Duration) *StatusCmd {
	cmd := NewStatusCmd(
		"migrate",
		host,
		port,
		key,
		db,
		formatMs(timeout),
	)
	cmd.setReadTimeout(readTimeout(timeout))
	c.process(cmd)
	return cmd
}

func (c *cmdable) Move(key string, db int64) *BoolCmd {
	cmd := NewBoolCmd("move", key, db)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ObjectRefCount(keys ...string) *IntCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "object"
	args[1] = "refcount"
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ObjectEncoding(keys ...string) *StringCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "object"
	args[1] = "encoding"
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewStringCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ObjectIdleTime(keys ...string) *DurationCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "object"
	args[1] = "idletime"
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewDurationCmd(time.Second, args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Persist(key string) *BoolCmd {
	cmd := NewBoolCmd("persist", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PExpire(key string, expiration time.Duration) *BoolCmd {
	cmd := NewBoolCmd("pexpire", key, formatMs(expiration))
	c.process(cmd)
	return cmd
}

func (c *cmdable) PExpireAt(key string, tm time.Time) *BoolCmd {
	cmd := NewBoolCmd(
		"pexpireat",
		key,
		tm.UnixNano()/int64(time.Millisecond),
	)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PTTL(key string) *DurationCmd {
	cmd := NewDurationCmd(time.Millisecond, "pttl", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RandomKey() *StringCmd {
	cmd := NewStringCmd("randomkey")
	c.process(cmd)
	return cmd
}

func (c *cmdable) Rename(key, newkey string) *StatusCmd {
	cmd := NewStatusCmd("rename", key, newkey)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RenameNX(key, newkey string) *BoolCmd {
	cmd := NewBoolCmd("renamenx", key, newkey)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Restore(key string, ttl time.Duration, value string) *StatusCmd {
	cmd := NewStatusCmd(
		"restore",
		key,
		formatMs(ttl),
		value,
	)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RestoreReplace(key string, ttl time.Duration, value string) *StatusCmd {
	cmd := NewStatusCmd(
		"restore",
		key,
		formatMs(ttl),
		value,
		"replace",
	)
	c.process(cmd)
	return cmd
}

type Sort struct {
	By            string
	Offset, Count float64
	Get           []string
	Order         string
	IsAlpha       bool
	Store         string
}

func (sort *Sort) args(key string) []interface{} {
	args := []interface{}{"sort", key}
	if sort.By != "" {
		args = append(args, "by", sort.By)
	}
	if sort.Offset != 0 || sort.Count != 0 {
		args = append(args, "limit", sort.Offset, sort.Count)
	}
	for _, get := range sort.Get {
		args = append(args, "get", get)
	}
	if sort.Order != "" {
		args = append(args, sort.Order)
	}
	if sort.IsAlpha {
		args = append(args, "alpha")
	}
	if sort.Store != "" {
		args = append(args, "store", sort.Store)
	}
	return args
}

func (c *cmdable) Sort(key string, sort Sort) *StringSliceCmd {
	cmd := NewStringSliceCmd(sort.args(key)...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SortInterfaces(key string, sort Sort) *SliceCmd {
	cmd := NewSliceCmd(sort.args(key)...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) TTL(key string) *DurationCmd {
	cmd := NewDurationCmd(time.Second, "ttl", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Type(key string) *StatusCmd {
	cmd := NewStatusCmd("type", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Scan(cursor uint64, match string, count int64) Scanner {
	args := []interface{}{"scan", cursor}
	if match != "" {
		args = append(args, "match", match)
	}
	if count > 0 {
		args = append(args, "count", count)
	}
	cmd := NewScanCmd(args...)
	c.process(cmd)
	return Scanner{
		client:  c,
		ScanCmd: cmd,
	}
}

func (c *cmdable) SScan(key string, cursor uint64, match string, count int64) Scanner {
	args := []interface{}{"sscan", key, cursor}
	if match != "" {
		args = append(args, "match", match)
	}
	if count > 0 {
		args = append(args, "count", count)
	}
	cmd := NewScanCmd(args...)
	c.process(cmd)
	return Scanner{
		client:  c,
		ScanCmd: cmd,
	}
}

func (c *cmdable) HScan(key string, cursor uint64, match string, count int64) Scanner {
	args := []interface{}{"hscan", key, cursor}
	if match != "" {
		args = append(args, "match", match)
	}
	if count > 0 {
		args = append(args, "count", count)
	}
	cmd := NewScanCmd(args...)
	c.process(cmd)
	return Scanner{
		client:  c,
		ScanCmd: cmd,
	}
}

func (c *cmdable) ZScan(key string, cursor uint64, match string, count int64) Scanner {
	args := []interface{}{"zscan", key, cursor}
	if match != "" {
		args = append(args, "match", match)
	}
	if count > 0 {
		args = append(args, "count", count)
	}
	cmd := NewScanCmd(args...)
	c.process(cmd)
	return Scanner{
		client:  c,
		ScanCmd: cmd,
	}
}

//------------------------------------------------------------------------------

func (c *cmdable) Append(key, value string) *IntCmd {
	cmd := NewIntCmd("append", key, value)
	c.process(cmd)
	return cmd
}

type BitCount struct {
	Start, End int64
}

func (c *cmdable) BitCount(key string, bitCount *BitCount) *IntCmd {
	args := []interface{}{"bitcount", key}
	if bitCount != nil {
		args = append(
			args,
			bitCount.Start,
			bitCount.End,
		)
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) bitOp(op, destKey string, keys ...string) *IntCmd {
	args := make([]interface{}, 3+len(keys))
	args[0] = "bitop"
	args[1] = op
	args[2] = destKey
	for i, key := range keys {
		args[3+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) BitOpAnd(destKey string, keys ...string) *IntCmd {
	return c.bitOp("and", destKey, keys...)
}

func (c *cmdable) BitOpOr(destKey string, keys ...string) *IntCmd {
	return c.bitOp("or", destKey, keys...)
}

func (c *cmdable) BitOpXor(destKey string, keys ...string) *IntCmd {
	return c.bitOp("xor", destKey, keys...)
}

func (c *cmdable) BitOpNot(destKey string, key string) *IntCmd {
	return c.bitOp("not", destKey, key)
}

func (c *cmdable) BitPos(key string, bit int64, pos ...int64) *IntCmd {
	args := make([]interface{}, 3+len(pos))
	args[0] = "bitpos"
	args[1] = key
	args[2] = bit
	switch len(pos) {
	case 0:
	case 1:
		args[3] = pos[0]
	case 2:
		args[3] = pos[0]
		args[4] = pos[1]
	default:
		panic("too many arguments")
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Decr(key string) *IntCmd {
	cmd := NewIntCmd("decr", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) DecrBy(key string, decrement int64) *IntCmd {
	cmd := NewIntCmd("decrby", key, decrement)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Get(key string) *StringCmd {
	cmd := NewStringCmd("get", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GetBit(key string, offset int64) *IntCmd {
	cmd := NewIntCmd("getbit", key, offset)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GetRange(key string, start, end int64) *StringCmd {
	cmd := NewStringCmd("getrange", key, start, end)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GetSet(key string, value interface{}) *StringCmd {
	cmd := NewStringCmd("getset", key, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) Incr(key string) *IntCmd {
	cmd := NewIntCmd("incr", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) IncrBy(key string, value int64) *IntCmd {
	cmd := NewIntCmd("incrby", key, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) IncrByFloat(key string, value float64) *FloatCmd {
	cmd := NewFloatCmd("incrbyfloat", key, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) MGet(keys ...string) *SliceCmd {
	args := make([]interface{}, 1+len(keys))
	args[0] = "mget"
	for i, key := range keys {
		args[1+i] = key
	}
	cmd := NewSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) MSet(pairs ...interface{}) *StatusCmd {
	args := make([]interface{}, 1+len(pairs))
	args[0] = "mset"
	for i, pair := range pairs {
		args[1+i] = pair
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) MSetNX(pairs ...interface{}) *BoolCmd {
	args := make([]interface{}, 1+len(pairs))
	args[0] = "msetnx"
	for i, pair := range pairs {
		args[1+i] = pair
	}
	cmd := NewBoolCmd(args...)
	c.process(cmd)
	return cmd
}

// Redis `SET key value [expiration]` command.
//
// Zero expiration means the key has no expiration time.
func (c *cmdable) Set(key string, value interface{}, expiration time.Duration) *StatusCmd {
	args := make([]interface{}, 3, 4)
	args[0] = "set"
	args[1] = key
	args[2] = value
	if expiration > 0 {
		if usePrecise(expiration) {
			args = append(args, "px", formatMs(expiration))
		} else {
			args = append(args, "ex", formatSec(expiration))
		}
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SetBit(key string, offset int64, value int) *IntCmd {
	cmd := NewIntCmd(
		"setbit",
		key,
		offset,
		value,
	)
	c.process(cmd)
	return cmd
}

// Redis `SET key value [expiration] NX` command.
//
// Zero expiration means the key has no expiration time.
func (c *cmdable) SetNX(key string, value interface{}, expiration time.Duration) *BoolCmd {
	var cmd *BoolCmd
	if expiration == 0 {
		// Use old `SETNX` to support old Redis versions.
		cmd = NewBoolCmd("setnx", key, value)
	} else {
		if usePrecise(expiration) {
			cmd = NewBoolCmd("set", key, value, "px", formatMs(expiration), "nx")
		} else {
			cmd = NewBoolCmd("set", key, value, "ex", formatSec(expiration), "nx")
		}
	}
	c.process(cmd)
	return cmd
}

// Redis `SET key value [expiration] XX` command.
//
// Zero expiration means the key has no expiration time.
func (c *cmdable) SetXX(key string, value interface{}, expiration time.Duration) *BoolCmd {
	var cmd *BoolCmd
	if expiration == 0 {
		cmd = NewBoolCmd("set", key, value, "xx")
	} else {
		if usePrecise(expiration) {
			cmd = NewBoolCmd("set", key, value, "px", formatMs(expiration), "xx")
		} else {
			cmd = NewBoolCmd("set", key, value, "ex", formatSec(expiration), "xx")
		}
	}
	c.process(cmd)
	return cmd
}

func (c *cmdable) SetRange(key string, offset int64, value string) *IntCmd {
	cmd := NewIntCmd("setrange", key, offset, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) StrLen(key string) *IntCmd {
	cmd := NewIntCmd("strlen", key)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) HDel(key string, fields ...string) *IntCmd {
	args := make([]interface{}, 2+len(fields))
	args[0] = "hdel"
	args[1] = key
	for i, field := range fields {
		args[2+i] = field
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HExists(key, field string) *BoolCmd {
	cmd := NewBoolCmd("hexists", key, field)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HGet(key, field string) *StringCmd {
	cmd := NewStringCmd("hget", key, field)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HGetAll(key string) *StringStringMapCmd {
	cmd := NewStringStringMapCmd("hgetall", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HIncrBy(key, field string, incr int64) *IntCmd {
	cmd := NewIntCmd("hincrby", key, field, incr)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HIncrByFloat(key, field string, incr float64) *FloatCmd {
	cmd := NewFloatCmd("hincrbyfloat", key, field, incr)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HKeys(key string) *StringSliceCmd {
	cmd := NewStringSliceCmd("hkeys", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HLen(key string) *IntCmd {
	cmd := NewIntCmd("hlen", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HMGet(key string, fields ...string) *SliceCmd {
	args := make([]interface{}, 2+len(fields))
	args[0] = "hmget"
	args[1] = key
	for i, field := range fields {
		args[2+i] = field
	}
	cmd := NewSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HMSet(key string, fields map[string]string) *StatusCmd {
	args := make([]interface{}, 2+len(fields)*2)
	args[0] = "hmset"
	args[1] = key
	i := 2
	for k, v := range fields {
		args[i] = k
		args[i+1] = v
		i += 2
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HSet(key, field, value string) *BoolCmd {
	cmd := NewBoolCmd("hset", key, field, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HSetNX(key, field, value string) *BoolCmd {
	cmd := NewBoolCmd("hsetnx", key, field, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) HVals(key string) *StringSliceCmd {
	cmd := NewStringSliceCmd("hvals", key)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) BLPop(timeout time.Duration, keys ...string) *StringSliceCmd {
	args := make([]interface{}, 1+len(keys)+1)
	args[0] = "blpop"
	for i, key := range keys {
		args[1+i] = key
	}
	args[len(args)-1] = formatSec(timeout)
	cmd := NewStringSliceCmd(args...)
	cmd.setReadTimeout(readTimeout(timeout))
	c.process(cmd)
	return cmd
}

func (c *cmdable) BRPop(timeout time.Duration, keys ...string) *StringSliceCmd {
	args := make([]interface{}, 1+len(keys)+1)
	args[0] = "brpop"
	for i, key := range keys {
		args[1+i] = key
	}
	args[len(keys)+1] = formatSec(timeout)
	cmd := NewStringSliceCmd(args...)
	cmd.setReadTimeout(readTimeout(timeout))
	c.process(cmd)
	return cmd
}

func (c *cmdable) BRPopLPush(source, destination string, timeout time.Duration) *StringCmd {
	cmd := NewStringCmd(
		"brpoplpush",
		source,
		destination,
		formatSec(timeout),
	)
	cmd.setReadTimeout(readTimeout(timeout))
	c.process(cmd)
	return cmd
}

func (c *cmdable) LIndex(key string, index int64) *StringCmd {
	cmd := NewStringCmd("lindex", key, index)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LInsert(key, op string, pivot, value interface{}) *IntCmd {
	cmd := NewIntCmd("linsert", key, op, pivot, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LInsertBefore(key string, pivot, value interface{}) *IntCmd {
	cmd := NewIntCmd("linsert", key, "before", pivot, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LInsertAfter(key string, pivot, value interface{}) *IntCmd {
	cmd := NewIntCmd("linsert", key, "after", pivot, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LLen(key string) *IntCmd {
	cmd := NewIntCmd("llen", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LPop(key string) *StringCmd {
	cmd := NewStringCmd("lpop", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LPush(key string, values ...interface{}) *IntCmd {
	args := make([]interface{}, 2+len(values))
	args[0] = "lpush"
	args[1] = key
	for i, value := range values {
		args[2+i] = value
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LPushX(key string, value interface{}) *IntCmd {
	cmd := NewIntCmd("lpushx", key, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LRange(key string, start, stop int64) *StringSliceCmd {
	cmd := NewStringSliceCmd(
		"lrange",
		key,
		start,
		stop,
	)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LRem(key string, count int64, value interface{}) *IntCmd {
	cmd := NewIntCmd("lrem", key, count, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LSet(key string, index int64, value interface{}) *StatusCmd {
	cmd := NewStatusCmd("lset", key, index, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LTrim(key string, start, stop int64) *StatusCmd {
	cmd := NewStatusCmd(
		"ltrim",
		key,
		start,
		stop,
	)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RPop(key string) *StringCmd {
	cmd := NewStringCmd("rpop", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RPopLPush(source, destination string) *StringCmd {
	cmd := NewStringCmd("rpoplpush", source, destination)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RPush(key string, values ...interface{}) *IntCmd {
	args := make([]interface{}, 2+len(values))
	args[0] = "rpush"
	args[1] = key
	for i, value := range values {
		args[2+i] = value
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) RPushX(key string, value interface{}) *IntCmd {
	cmd := NewIntCmd("rpushx", key, value)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) SAdd(key string, members ...interface{}) *IntCmd {
	args := make([]interface{}, 2+len(members))
	args[0] = "sadd"
	args[1] = key
	for i, member := range members {
		args[2+i] = member
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SCard(key string) *IntCmd {
	cmd := NewIntCmd("scard", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SDiff(keys ...string) *StringSliceCmd {
	args := make([]interface{}, 1+len(keys))
	args[0] = "sdiff"
	for i, key := range keys {
		args[1+i] = key
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SDiffStore(destination string, keys ...string) *IntCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "sdiffstore"
	args[1] = destination
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SInter(keys ...string) *StringSliceCmd {
	args := make([]interface{}, 1+len(keys))
	args[0] = "sinter"
	for i, key := range keys {
		args[1+i] = key
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SInterStore(destination string, keys ...string) *IntCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "sinterstore"
	args[1] = destination
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SIsMember(key string, member interface{}) *BoolCmd {
	cmd := NewBoolCmd("sismember", key, member)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SMembers(key string) *StringSliceCmd {
	cmd := NewStringSliceCmd("smembers", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SMove(source, destination string, member interface{}) *BoolCmd {
	cmd := NewBoolCmd("smove", source, destination, member)
	c.process(cmd)
	return cmd
}

// Redis `SPOP key` command.
func (c *cmdable) SPop(key string) *StringCmd {
	cmd := NewStringCmd("spop", key)
	c.process(cmd)
	return cmd
}

// Redis `SPOP key count` command.
func (c *cmdable) SPopN(key string, count int64) *StringSliceCmd {
	cmd := NewStringSliceCmd("spop", key, count)
	c.process(cmd)
	return cmd
}

// Redis `SRANDMEMBER key` command.
func (c *cmdable) SRandMember(key string) *StringCmd {
	cmd := NewStringCmd("srandmember", key)
	c.process(cmd)
	return cmd
}

// Redis `SRANDMEMBER key count` command.
func (c *cmdable) SRandMemberN(key string, count int64) *StringSliceCmd {
	cmd := NewStringSliceCmd("srandmember", key, count)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SRem(key string, members ...interface{}) *IntCmd {
	args := make([]interface{}, 2+len(members))
	args[0] = "srem"
	args[1] = key
	for i, member := range members {
		args[2+i] = member
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SUnion(keys ...string) *StringSliceCmd {
	args := make([]interface{}, 1+len(keys))
	args[0] = "sunion"
	for i, key := range keys {
		args[1+i] = key
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SUnionStore(destination string, keys ...string) *IntCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "sunionstore"
	args[1] = destination
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

// Z represents sorted set member.
type Z struct {
	Score  float64
	Member interface{}
}

// ZStore is used as an arg to ZInterStore and ZUnionStore.
type ZStore struct {
	Weights []float64
	// Can be SUM, MIN or MAX.
	Aggregate string
}

func (c *cmdable) zAdd(a []interface{}, n int, members ...Z) *IntCmd {
	for i, m := range members {
		a[n+2*i] = m.Score
		a[n+2*i+1] = m.Member
	}
	cmd := NewIntCmd(a...)
	c.process(cmd)
	return cmd
}

// Redis `ZADD key score member [score member ...]` command.
func (c *cmdable) ZAdd(key string, members ...Z) *IntCmd {
	const n = 2
	a := make([]interface{}, n+2*len(members))
	a[0], a[1] = "zadd", key
	return c.zAdd(a, n, members...)
}

// Redis `ZADD key NX score member [score member ...]` command.
func (c *cmdable) ZAddNX(key string, members ...Z) *IntCmd {
	const n = 3
	a := make([]interface{}, n+2*len(members))
	a[0], a[1], a[2] = "zadd", key, "nx"
	return c.zAdd(a, n, members...)
}

// Redis `ZADD key XX score member [score member ...]` command.
func (c *cmdable) ZAddXX(key string, members ...Z) *IntCmd {
	const n = 3
	a := make([]interface{}, n+2*len(members))
	a[0], a[1], a[2] = "zadd", key, "xx"
	return c.zAdd(a, n, members...)
}

// Redis `ZADD key CH score member [score member ...]` command.
func (c *cmdable) ZAddCh(key string, members ...Z) *IntCmd {
	const n = 3
	a := make([]interface{}, n+2*len(members))
	a[0], a[1], a[2] = "zadd", key, "ch"
	return c.zAdd(a, n, members...)
}

// Redis `ZADD key NX CH score member [score member ...]` command.
func (c *cmdable) ZAddNXCh(key string, members ...Z) *IntCmd {
	const n = 4
	a := make([]interface{}, n+2*len(members))
	a[0], a[1], a[2], a[3] = "zadd", key, "nx", "ch"
	return c.zAdd(a, n, members...)
}

// Redis `ZADD key XX CH score member [score member ...]` command.
func (c *cmdable) ZAddXXCh(key string, members ...Z) *IntCmd {
	const n = 4
	a := make([]interface{}, n+2*len(members))
	a[0], a[1], a[2], a[3] = "zadd", key, "xx", "ch"
	return c.zAdd(a, n, members...)
}

func (c *cmdable) zIncr(a []interface{}, n int, members ...Z) *FloatCmd {
	for i, m := range members {
		a[n+2*i] = m.Score
		a[n+2*i+1] = m.Member
	}
	cmd := NewFloatCmd(a...)
	c.process(cmd)
	return cmd
}

// Redis `ZADD key INCR score member` command.
func (c *cmdable) ZIncr(key string, member Z) *FloatCmd {
	const n = 3
	a := make([]interface{}, n+2)
	a[0], a[1], a[2] = "zadd", key, "incr"
	return c.zIncr(a, n, member)
}

// Redis `ZADD key NX INCR score member` command.
func (c *cmdable) ZIncrNX(key string, member Z) *FloatCmd {
	const n = 4
	a := make([]interface{}, n+2)
	a[0], a[1], a[2], a[3] = "zadd", key, "incr", "nx"
	return c.zIncr(a, n, member)
}

// Redis `ZADD key XX INCR score member` command.
func (c *cmdable) ZIncrXX(key string, member Z) *FloatCmd {
	const n = 4
	a := make([]interface{}, n+2)
	a[0], a[1], a[2], a[3] = "zadd", key, "incr", "xx"
	return c.zIncr(a, n, member)
}

func (c *cmdable) ZCard(key string) *IntCmd {
	cmd := NewIntCmd("zcard", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZCount(key, min, max string) *IntCmd {
	cmd := NewIntCmd("zcount", key, min, max)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZIncrBy(key string, increment float64, member string) *FloatCmd {
	cmd := NewFloatCmd("zincrby", key, increment, member)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZInterStore(destination string, store ZStore, keys ...string) *IntCmd {
	args := make([]interface{}, 3+len(keys))
	args[0] = "zinterstore"
	args[1] = destination
	args[2] = strconv.Itoa(len(keys))
	for i, key := range keys {
		args[3+i] = key
	}
	if len(store.Weights) > 0 {
		args = append(args, "weights")
		for _, weight := range store.Weights {
			args = append(args, weight)
		}
	}
	if store.Aggregate != "" {
		args = append(args, "aggregate", store.Aggregate)
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) zRange(key string, start, stop int64, withScores bool) *StringSliceCmd {
	args := []interface{}{
		"zrange",
		key,
		start,
		stop,
	}
	if withScores {
		args = append(args, "withscores")
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRange(key string, start, stop int64) *StringSliceCmd {
	return c.zRange(key, start, stop, false)
}

func (c *cmdable) ZRangeWithScores(key string, start, stop int64) *ZSliceCmd {
	cmd := NewZSliceCmd("zrange", key, start, stop, "withscores")
	c.process(cmd)
	return cmd
}

type ZRangeBy struct {
	Min, Max      string
	Offset, Count int64
}

func (c *cmdable) zRangeBy(zcmd, key string, opt ZRangeBy, withScores bool) *StringSliceCmd {
	args := []interface{}{zcmd, key, opt.Min, opt.Max}
	if withScores {
		args = append(args, "withscores")
	}
	if opt.Offset != 0 || opt.Count != 0 {
		args = append(
			args,
			"limit",
			opt.Offset,
			opt.Count,
		)
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRangeByScore(key string, opt ZRangeBy) *StringSliceCmd {
	return c.zRangeBy("zrangebyscore", key, opt, false)
}

func (c *cmdable) ZRangeByLex(key string, opt ZRangeBy) *StringSliceCmd {
	return c.zRangeBy("zrangebylex", key, opt, false)
}

func (c *cmdable) ZRangeByScoreWithScores(key string, opt ZRangeBy) *ZSliceCmd {
	args := []interface{}{"zrangebyscore", key, opt.Min, opt.Max, "withscores"}
	if opt.Offset != 0 || opt.Count != 0 {
		args = append(
			args,
			"limit",
			opt.Offset,
			opt.Count,
		)
	}
	cmd := NewZSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRank(key, member string) *IntCmd {
	cmd := NewIntCmd("zrank", key, member)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRem(key string, members ...interface{}) *IntCmd {
	args := make([]interface{}, 2+len(members))
	args[0] = "zrem"
	args[1] = key
	for i, member := range members {
		args[2+i] = member
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRemRangeByRank(key string, start, stop int64) *IntCmd {
	cmd := NewIntCmd(
		"zremrangebyrank",
		key,
		start,
		stop,
	)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRemRangeByScore(key, min, max string) *IntCmd {
	cmd := NewIntCmd("zremrangebyscore", key, min, max)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRevRange(key string, start, stop int64) *StringSliceCmd {
	cmd := NewStringSliceCmd("zrevrange", key, start, stop)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRevRangeWithScores(key string, start, stop int64) *ZSliceCmd {
	cmd := NewZSliceCmd("zrevrange", key, start, stop, "withscores")
	c.process(cmd)
	return cmd
}

func (c *cmdable) zRevRangeBy(zcmd, key string, opt ZRangeBy) *StringSliceCmd {
	args := []interface{}{zcmd, key, opt.Max, opt.Min}
	if opt.Offset != 0 || opt.Count != 0 {
		args = append(
			args,
			"limit",
			opt.Offset,
			opt.Count,
		)
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRevRangeByScore(key string, opt ZRangeBy) *StringSliceCmd {
	return c.zRevRangeBy("zrevrangebyscore", key, opt)
}

func (c *cmdable) ZRevRangeByLex(key string, opt ZRangeBy) *StringSliceCmd {
	return c.zRevRangeBy("zrevrangebylex", key, opt)
}

func (c *cmdable) ZRevRangeByScoreWithScores(key string, opt ZRangeBy) *ZSliceCmd {
	args := []interface{}{"zrevrangebyscore", key, opt.Max, opt.Min, "withscores"}
	if opt.Offset != 0 || opt.Count != 0 {
		args = append(
			args,
			"limit",
			opt.Offset,
			opt.Count,
		)
	}
	cmd := NewZSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZRevRank(key, member string) *IntCmd {
	cmd := NewIntCmd("zrevrank", key, member)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZScore(key, member string) *FloatCmd {
	cmd := NewFloatCmd("zscore", key, member)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ZUnionStore(dest string, store ZStore, keys ...string) *IntCmd {
	args := make([]interface{}, 3+len(keys))
	args[0] = "zunionstore"
	args[1] = dest
	args[2] = strconv.Itoa(len(keys))
	for i, key := range keys {
		args[3+i] = key
	}
	if len(store.Weights) > 0 {
		args = append(args, "weights")
		for _, weight := range store.Weights {
			args = append(args, weight)
		}
	}
	if store.Aggregate != "" {
		args = append(args, "aggregate", store.Aggregate)
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) PFAdd(key string, els ...interface{}) *IntCmd {
	args := make([]interface{}, 2+len(els))
	args[0] = "pfadd"
	args[1] = key
	for i, el := range els {
		args[2+i] = el
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PFCount(keys ...string) *IntCmd {
	args := make([]interface{}, 1+len(keys))
	args[0] = "pfcount"
	for i, key := range keys {
		args[1+i] = key
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PFMerge(dest string, keys ...string) *StatusCmd {
	args := make([]interface{}, 2+len(keys))
	args[0] = "pfmerge"
	args[1] = dest
	for i, key := range keys {
		args[2+i] = key
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) BgRewriteAOF() *StatusCmd {
	cmd := NewStatusCmd("bgrewriteaof")
	c.process(cmd)
	return cmd
}

func (c *cmdable) BgSave() *StatusCmd {
	cmd := NewStatusCmd("bgsave")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClientKill(ipPort string) *StatusCmd {
	cmd := NewStatusCmd("client", "kill", ipPort)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClientList() *StringCmd {
	cmd := NewStringCmd("client", "list")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClientPause(dur time.Duration) *BoolCmd {
	cmd := NewBoolCmd("client", "pause", formatMs(dur))
	c.process(cmd)
	return cmd
}

// ClientSetName assigns a name to the one of many connections in the pool.
func (c *cmdable) ClientSetName(name string) *BoolCmd {
	cmd := NewBoolCmd("client", "setname", name)
	c.process(cmd)
	return cmd
}

// ClientGetName returns the name of the one of many connections in the pool.
func (c *Client) ClientGetName() *StringCmd {
	cmd := NewStringCmd("client", "getname")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ConfigGet(parameter string) *SliceCmd {
	cmd := NewSliceCmd("config", "get", parameter)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ConfigResetStat() *StatusCmd {
	cmd := NewStatusCmd("config", "resetstat")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ConfigSet(parameter, value string) *StatusCmd {
	cmd := NewStatusCmd("config", "set", parameter, value)
	c.process(cmd)
	return cmd
}

func (c *cmdable) DbSize() *IntCmd {
	cmd := NewIntCmd("dbsize")
	c.process(cmd)
	return cmd
}

func (c *cmdable) FlushAll() *StatusCmd {
	cmd := NewStatusCmd("flushall")
	c.process(cmd)
	return cmd
}

func (c *cmdable) FlushDb() *StatusCmd {
	cmd := NewStatusCmd("flushdb")
	c.process(cmd)
	return cmd
}

func (c *cmdable) Info(section ...string) *StringCmd {
	args := []interface{}{"info"}
	if len(section) > 0 {
		args = append(args, section[0])
	}
	cmd := NewStringCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) LastSave() *IntCmd {
	cmd := NewIntCmd("lastsave")
	c.process(cmd)
	return cmd
}

func (c *cmdable) Save() *StatusCmd {
	cmd := NewStatusCmd("save")
	c.process(cmd)
	return cmd
}

func (c *cmdable) shutdown(modifier string) *StatusCmd {
	var args []interface{}
	if modifier == "" {
		args = []interface{}{"shutdown"}
	} else {
		args = []interface{}{"shutdown", modifier}
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	if err := cmd.Err(); err != nil {
		if err == io.EOF {
			// Server quit as expected.
			cmd.err = nil
		}
	} else {
		// Server did not quit. String reply contains the reason.
		cmd.err = internal.RedisError(cmd.val)
		cmd.val = ""
	}
	return cmd
}

func (c *cmdable) Shutdown() *StatusCmd {
	return c.shutdown("")
}

func (c *cmdable) ShutdownSave() *StatusCmd {
	return c.shutdown("save")
}

func (c *cmdable) ShutdownNoSave() *StatusCmd {
	return c.shutdown("nosave")
}

func (c *cmdable) SlaveOf(host, port string) *StatusCmd {
	cmd := NewStatusCmd("slaveof", host, port)
	c.process(cmd)
	return cmd
}

func (c *cmdable) SlowLog() {
	panic("not implemented")
}

func (c *cmdable) Sync() {
	panic("not implemented")
}

func (c *cmdable) Time() *TimeCmd {
	cmd := NewTimeCmd("time")
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) Eval(script string, keys []string, args ...interface{}) *Cmd {
	cmdArgs := make([]interface{}, 3+len(keys)+len(args))
	cmdArgs[0] = "eval"
	cmdArgs[1] = script
	cmdArgs[2] = strconv.Itoa(len(keys))
	for i, key := range keys {
		cmdArgs[3+i] = key
	}
	pos := 3 + len(keys)
	for i, arg := range args {
		cmdArgs[pos+i] = arg
	}
	cmd := NewCmd(cmdArgs...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) EvalSha(sha1 string, keys []string, args ...interface{}) *Cmd {
	cmdArgs := make([]interface{}, 3+len(keys)+len(args))
	cmdArgs[0] = "evalsha"
	cmdArgs[1] = sha1
	cmdArgs[2] = strconv.Itoa(len(keys))
	for i, key := range keys {
		cmdArgs[3+i] = key
	}
	pos := 3 + len(keys)
	for i, arg := range args {
		cmdArgs[pos+i] = arg
	}
	cmd := NewCmd(cmdArgs...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ScriptExists(scripts ...string) *BoolSliceCmd {
	args := make([]interface{}, 2+len(scripts))
	args[0] = "script"
	args[1] = "exists"
	for i, script := range scripts {
		args[2+i] = script
	}
	cmd := NewBoolSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ScriptFlush() *StatusCmd {
	cmd := NewStatusCmd("script", "flush")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ScriptKill() *StatusCmd {
	cmd := NewStatusCmd("script", "kill")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ScriptLoad(script string) *StringCmd {
	cmd := NewStringCmd("script", "load", script)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) DebugObject(key string) *StringCmd {
	cmd := NewStringCmd("debug", "object", key)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

// Publish posts the message to the channel.
func (c *cmdable) Publish(channel, message string) *IntCmd {
	cmd := NewIntCmd("PUBLISH", channel, message)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PubSubChannels(pattern string) *StringSliceCmd {
	args := []interface{}{"pubsub", "channels"}
	if pattern != "*" {
		args = append(args, pattern)
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PubSubNumSub(channels ...string) *StringIntMapCmd {
	args := make([]interface{}, 2+len(channels))
	args[0] = "pubsub"
	args[1] = "numsub"
	for i, channel := range channels {
		args[2+i] = channel
	}
	cmd := NewStringIntMapCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) PubSubNumPat() *IntCmd {
	cmd := NewIntCmd("pubsub", "numpat")
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) ClusterSlots() *ClusterSlotsCmd {
	cmd := NewClusterSlotsCmd("cluster", "slots")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterNodes() *StringCmd {
	cmd := NewStringCmd("cluster", "nodes")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterMeet(host, port string) *StatusCmd {
	cmd := NewStatusCmd("cluster", "meet", host, port)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterForget(nodeID string) *StatusCmd {
	cmd := NewStatusCmd("cluster", "forget", nodeID)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterReplicate(nodeID string) *StatusCmd {
	cmd := NewStatusCmd("cluster", "replicate", nodeID)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterResetSoft() *StatusCmd {
	cmd := NewStatusCmd("cluster", "reset", "soft")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterResetHard() *StatusCmd {
	cmd := NewStatusCmd("cluster", "reset", "hard")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterInfo() *StringCmd {
	cmd := NewStringCmd("cluster", "info")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterKeySlot(key string) *IntCmd {
	cmd := NewIntCmd("cluster", "keyslot", key)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterCountFailureReports(nodeID string) *IntCmd {
	cmd := NewIntCmd("cluster", "count-failure-reports", nodeID)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterCountKeysInSlot(slot int) *IntCmd {
	cmd := NewIntCmd("cluster", "countkeysinslot", slot)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterDelSlots(slots ...int) *StatusCmd {
	args := make([]interface{}, 2+len(slots))
	args[0] = "cluster"
	args[1] = "delslots"
	for i, slot := range slots {
		args[2+i] = slot
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterDelSlotsRange(min, max int) *StatusCmd {
	size := max - min + 1
	slots := make([]int, size)
	for i := 0; i < size; i++ {
		slots[i] = min + i
	}
	return c.ClusterDelSlots(slots...)
}

func (c *cmdable) ClusterSaveConfig() *StatusCmd {
	cmd := NewStatusCmd("cluster", "saveconfig")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterSlaves(nodeID string) *StringSliceCmd {
	cmd := NewStringSliceCmd("cluster", "slaves", nodeID)
	c.process(cmd)
	return cmd
}

func (c *statefulCmdable) ReadOnly() *StatusCmd {
	cmd := NewStatusCmd("readonly")
	c.process(cmd)
	return cmd
}

func (c *statefulCmdable) ReadWrite() *StatusCmd {
	cmd := NewStatusCmd("readwrite")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterFailover() *StatusCmd {
	cmd := NewStatusCmd("cluster", "failover")
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterAddSlots(slots ...int) *StatusCmd {
	args := make([]interface{}, 2+len(slots))
	args[0] = "cluster"
	args[1] = "addslots"
	for i, num := range slots {
		args[2+i] = strconv.Itoa(num)
	}
	cmd := NewStatusCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) ClusterAddSlotsRange(min, max int) *StatusCmd {
	size := max - min + 1
	slots := make([]int, size)
	for i := 0; i < size; i++ {
		slots[i] = min + i
	}
	return c.ClusterAddSlots(slots...)
}

//------------------------------------------------------------------------------

func (c *cmdable) GeoAdd(key string, geoLocation ...*GeoLocation) *IntCmd {
	args := make([]interface{}, 2+3*len(geoLocation))
	args[0] = "geoadd"
	args[1] = key
	for i, eachLoc := range geoLocation {
		args[2+3*i] = eachLoc.Longitude
		args[2+3*i+1] = eachLoc.Latitude
		args[2+3*i+2] = eachLoc.Name
	}
	cmd := NewIntCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GeoRadius(key string, longitude, latitude float64, query *GeoRadiusQuery) *GeoLocationCmd {
	cmd := NewGeoLocationCmd(query, "georadius", key, longitude, latitude)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GeoRadiusByMember(key, member string, query *GeoRadiusQuery) *GeoLocationCmd {
	cmd := NewGeoLocationCmd(query, "georadiusbymember", key, member)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GeoDist(key string, member1, member2, unit string) *FloatCmd {
	if unit == "" {
		unit = "km"
	}
	cmd := NewFloatCmd("geodist", key, member1, member2, unit)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GeoHash(key string, members ...string) *StringSliceCmd {
	args := make([]interface{}, 2+len(members))
	args[0] = "geohash"
	args[1] = key
	for i, member := range members {
		args[2+i] = member
	}
	cmd := NewStringSliceCmd(args...)
	c.process(cmd)
	return cmd
}

func (c *cmdable) GeoPos(key string, members ...string) *GeoPosCmd {
	args := make([]interface{}, 2+len(members))
	args[0] = "geopos"
	args[1] = key
	for i, member := range members {
		args[2+i] = member
	}
	cmd := NewGeoPosCmd(args...)
	c.process(cmd)
	return cmd
}

//------------------------------------------------------------------------------

func (c *cmdable) Command() *CommandsInfoCmd {
	cmd := NewCommandsInfoCmd("command")
	c.process(cmd)
	return cmd
}