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command.go
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package redis
import (
"bufio"
"context"
"fmt"
"maps"
"net"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/redis/go-redis/v9/internal"
"github.com/redis/go-redis/v9/internal/hscan"
"github.com/redis/go-redis/v9/internal/proto"
"github.com/redis/go-redis/v9/internal/routing"
"github.com/redis/go-redis/v9/internal/util"
)
// keylessCommands contains Redis commands that have empty key specifications (9th slot empty)
// Only includes core Redis commands, excludes FT.*, ts.*, timeseries.*, search.* and subcommands
var keylessCommands = map[string]struct{}{
"acl": {},
"asking": {},
"auth": {},
"bgrewriteaof": {},
"bgsave": {},
"client": {},
"cluster": {},
"config": {},
"debug": {},
"discard": {},
"echo": {},
"exec": {},
"failover": {},
"function": {},
"hello": {},
"hotkeys": {},
"latency": {},
"lolwut": {},
"module": {},
"monitor": {},
"multi": {},
"pfselftest": {},
"ping": {},
"psubscribe": {},
"psync": {},
"publish": {},
"pubsub": {},
"punsubscribe": {},
"quit": {},
"readonly": {},
"readwrite": {},
"replconf": {},
"replicaof": {},
"role": {},
"save": {},
"script": {},
"select": {},
"shutdown": {},
"slaveof": {},
"slowlog": {},
"subscribe": {},
"swapdb": {},
"sync": {},
"unsubscribe": {},
"unwatch": {},
"wait": {},
}
// CmdTyper interface for getting command type
type CmdTyper interface {
GetCmdType() CmdType
}
// CmdTypeGetter interface for getting command type without circular imports
type CmdTypeGetter interface {
GetCmdType() CmdType
}
type CmdType uint8
const (
CmdTypeGeneric CmdType = iota
CmdTypeString
CmdTypeInt
CmdTypeBool
CmdTypeFloat
CmdTypeStringSlice
CmdTypeIntSlice
CmdTypeFloatSlice
CmdTypeBoolSlice
CmdTypeMapStringString
CmdTypeMapStringInt
CmdTypeMapStringInterface
CmdTypeMapStringInterfaceSlice
CmdTypeSlice
CmdTypeStatus
CmdTypeDuration
CmdTypeTime
CmdTypeKeyValueSlice
CmdTypeStringStructMap
CmdTypeXMessageSlice
CmdTypeXStreamSlice
CmdTypeXPending
CmdTypeXPendingExt
CmdTypeXAutoClaim
CmdTypeXAutoClaimJustID
CmdTypeXInfoConsumers
CmdTypeXInfoGroups
CmdTypeXInfoStream
CmdTypeXInfoStreamFull
CmdTypeZSlice
CmdTypeZWithKey
CmdTypeScan
CmdTypeClusterSlots
CmdTypeGeoLocation
CmdTypeGeoSearchLocation
CmdTypeGeoPos
CmdTypeCommandsInfo
CmdTypeSlowLog
CmdTypeMapStringStringSlice
CmdTypeMapMapStringInterface
CmdTypeKeyValues
CmdTypeZSliceWithKey
CmdTypeFunctionList
CmdTypeFunctionStats
CmdTypeLCS
CmdTypeKeyFlags
CmdTypeClusterLinks
CmdTypeClusterShards
CmdTypeRankWithScore
CmdTypeClientInfo
CmdTypeACLLog
CmdTypeInfo
CmdTypeMonitor
CmdTypeJSON
CmdTypeJSONSlice
CmdTypeIntPointerSlice
CmdTypeScanDump
CmdTypeBFInfo
CmdTypeCFInfo
CmdTypeCMSInfo
CmdTypeTopKInfo
CmdTypeTDigestInfo
CmdTypeFTSynDump
CmdTypeAggregate
CmdTypeFTInfo
CmdTypeFTSpellCheck
CmdTypeFTSearch
CmdTypeTSTimestampValue
CmdTypeTSTimestampValueSlice
CmdTypeHotKeys
)
type (
CmdTypeXAutoClaimValue struct {
messages []XMessage
start string
}
CmdTypeXAutoClaimJustIDValue struct {
ids []string
start string
}
CmdTypeScanValue struct {
keys []string
cursor uint64
}
CmdTypeKeyValuesValue struct {
key string
values []string
}
CmdTypeZSliceWithKeyValue struct {
key string
zSlice []Z
}
)
type Cmder interface {
// command name.
// e.g. "set k v ex 10" -> "set", "cluster info" -> "cluster".
Name() string
// full command name.
// e.g. "set k v ex 10" -> "set", "cluster info" -> "cluster info".
FullName() string
// all args of the command.
// e.g. "set k v ex 10" -> "[set k v ex 10]".
Args() []interface{}
// format request and response string.
// e.g. "set k v ex 10" -> "set k v ex 10: OK", "get k" -> "get k: v".
String() string
// Clone creates a copy of the command.
Clone() Cmder
stringArg(int) string
firstKeyPos() int8
SetFirstKeyPos(int8)
stepCount() int8
SetStepCount(int8)
readTimeout() *time.Duration
readReply(rd *proto.Reader) error
readRawReply(rd *proto.Reader) error
SetErr(error)
Err() error
// GetCmdType returns the command type for fast value extraction
GetCmdType() CmdType
}
func setCmdsErr(cmds []Cmder, e error) {
for _, cmd := range cmds {
if cmd.Err() == nil {
cmd.SetErr(e)
}
}
}
func cmdsFirstErr(cmds []Cmder) error {
for _, cmd := range cmds {
if err := cmd.Err(); err != nil {
return err
}
}
return nil
}
func writeCmds(wr *proto.Writer, cmds []Cmder) error {
for _, cmd := range cmds {
if err := writeCmd(wr, cmd); err != nil {
return err
}
}
return nil
}
func writeCmd(wr *proto.Writer, cmd Cmder) error {
return wr.WriteArgs(cmd.Args())
}
// cmdFirstKeyPos returns the position of the first key in the command's arguments.
// If the command does not have a key, it returns 0.
// TODO: Use the data in CommandInfo to determine the first key position.
func cmdFirstKeyPos(cmd Cmder) int {
if pos := cmd.firstKeyPos(); pos != 0 {
return int(pos)
}
name := cmd.Name()
// first check if the command is keyless
if _, ok := keylessCommands[name]; ok {
return 0
}
switch name {
case "eval", "evalsha", "eval_ro", "evalsha_ro":
if cmd.stringArg(2) != "0" {
return 3
}
return 0
case "publish":
return 1
case "memory":
// https://github.com/redis/redis/issues/7493
if cmd.stringArg(1) == "usage" {
return 2
}
}
return 1
}
func cmdString(cmd Cmder, val interface{}) string {
b := make([]byte, 0, 64)
for i, arg := range cmd.Args() {
if i > 0 {
b = append(b, ' ')
}
b = internal.AppendArg(b, arg)
}
if err := cmd.Err(); err != nil {
b = append(b, ": "...)
b = append(b, err.Error()...)
} else if val != nil {
b = append(b, ": "...)
b = internal.AppendArg(b, val)
}
return util.BytesToString(b)
}
//------------------------------------------------------------------------------
type baseCmd struct {
ctx context.Context
args []interface{}
err error
keyPos int8
_stepCount int8
rawVal interface{}
_readTimeout *time.Duration
cmdType CmdType
}
var _ Cmder = (*Cmd)(nil)
func (cmd *baseCmd) Name() string {
if len(cmd.args) == 0 {
return ""
}
// Cmd name must be lower cased.
return internal.ToLower(cmd.stringArg(0))
}
func (cmd *baseCmd) FullName() string {
switch name := cmd.Name(); name {
case "cluster", "command":
if len(cmd.args) == 1 {
return name
}
if s2, ok := cmd.args[1].(string); ok {
return name + " " + s2
}
return name
default:
return name
}
}
func (cmd *baseCmd) Args() []interface{} {
return cmd.args
}
func (cmd *baseCmd) stringArg(pos int) string {
if pos < 0 || pos >= len(cmd.args) {
return ""
}
arg := cmd.args[pos]
switch v := arg.(type) {
case string:
return v
case []byte:
return string(v)
default:
// TODO: consider using appendArg
return fmt.Sprint(v)
}
}
func (cmd *baseCmd) firstKeyPos() int8 {
return cmd.keyPos
}
func (cmd *baseCmd) SetFirstKeyPos(keyPos int8) {
cmd.keyPos = keyPos
}
func (cmd *baseCmd) stepCount() int8 {
return cmd._stepCount
}
func (cmd *baseCmd) SetStepCount(stepCount int8) {
cmd._stepCount = stepCount
}
func (cmd *baseCmd) SetErr(e error) {
cmd.err = e
}
func (cmd *baseCmd) Err() error {
return cmd.err
}
func (cmd *baseCmd) readTimeout() *time.Duration {
return cmd._readTimeout
}
func (cmd *baseCmd) setReadTimeout(d time.Duration) {
cmd._readTimeout = &d
}
func (cmd *baseCmd) readRawReply(rd *proto.Reader) (err error) {
cmd.rawVal, err = rd.ReadReply()
return err
}
func (cmd *baseCmd) GetCmdType() CmdType {
return cmd.cmdType
}
func (cmd *baseCmd) cloneBaseCmd() baseCmd {
var readTimeout *time.Duration
if cmd._readTimeout != nil {
timeout := *cmd._readTimeout
readTimeout = &timeout
}
// Create a copy of args slice
args := make([]interface{}, len(cmd.args))
copy(args, cmd.args)
return baseCmd{
ctx: cmd.ctx,
args: args,
err: cmd.err,
keyPos: cmd.keyPos,
_stepCount: cmd._stepCount,
rawVal: cmd.rawVal,
_readTimeout: readTimeout,
cmdType: cmd.cmdType,
}
}
//------------------------------------------------------------------------------
type Cmd struct {
baseCmd
val interface{}
}
func NewCmd(ctx context.Context, args ...interface{}) *Cmd {
return &Cmd{
baseCmd: baseCmd{
ctx: ctx,
args: args,
cmdType: CmdTypeGeneric,
},
}
}
func (cmd *Cmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *Cmd) SetVal(val interface{}) {
cmd.val = val
}
func (cmd *Cmd) Val() interface{} {
return cmd.val
}
func (cmd *Cmd) Result() (interface{}, error) {
return cmd.val, cmd.err
}
func (cmd *Cmd) Text() (string, error) {
if cmd.err != nil {
return "", cmd.err
}
return toString(cmd.val)
}
func toString(val interface{}) (string, error) {
switch val := val.(type) {
case string:
return val, nil
default:
err := fmt.Errorf("redis: unexpected type=%T for String", val)
return "", err
}
}
func (cmd *Cmd) Int() (int, error) {
if cmd.err != nil {
return 0, cmd.err
}
switch val := cmd.val.(type) {
case int64:
return int(val), nil
case string:
return strconv.Atoi(val)
default:
err := fmt.Errorf("redis: unexpected type=%T for Int", val)
return 0, err
}
}
func (cmd *Cmd) Int64() (int64, error) {
if cmd.err != nil {
return 0, cmd.err
}
return toInt64(cmd.val)
}
func toInt64(val interface{}) (int64, error) {
switch val := val.(type) {
case int64:
return val, nil
case string:
return strconv.ParseInt(val, 10, 64)
default:
err := fmt.Errorf("redis: unexpected type=%T for Int64", val)
return 0, err
}
}
func (cmd *Cmd) Uint64() (uint64, error) {
if cmd.err != nil {
return 0, cmd.err
}
return toUint64(cmd.val)
}
func toUint64(val interface{}) (uint64, error) {
switch val := val.(type) {
case int64:
return uint64(val), nil
case string:
return strconv.ParseUint(val, 10, 64)
default:
err := fmt.Errorf("redis: unexpected type=%T for Uint64", val)
return 0, err
}
}
func (cmd *Cmd) Float32() (float32, error) {
if cmd.err != nil {
return 0, cmd.err
}
return toFloat32(cmd.val)
}
func toFloat32(val interface{}) (float32, error) {
switch val := val.(type) {
case int64:
return float32(val), nil
case string:
f, err := strconv.ParseFloat(val, 32)
if err != nil {
return 0, err
}
return float32(f), nil
default:
err := fmt.Errorf("redis: unexpected type=%T for Float32", val)
return 0, err
}
}
func (cmd *Cmd) Float64() (float64, error) {
if cmd.err != nil {
return 0, cmd.err
}
return toFloat64(cmd.val)
}
func toFloat64(val interface{}) (float64, error) {
switch val := val.(type) {
case int64:
return float64(val), nil
case string:
return strconv.ParseFloat(val, 64)
default:
err := fmt.Errorf("redis: unexpected type=%T for Float64", val)
return 0, err
}
}
func (cmd *Cmd) Bool() (bool, error) {
if cmd.err != nil {
return false, cmd.err
}
return toBool(cmd.val)
}
func toBool(val interface{}) (bool, error) {
switch val := val.(type) {
case bool:
return val, nil
case int64:
return val != 0, nil
case string:
return strconv.ParseBool(val)
default:
err := fmt.Errorf("redis: unexpected type=%T for Bool", val)
return false, err
}
}
func (cmd *Cmd) Slice() ([]interface{}, error) {
if cmd.err != nil {
return nil, cmd.err
}
switch val := cmd.val.(type) {
case []interface{}:
return val, nil
default:
return nil, fmt.Errorf("redis: unexpected type=%T for Slice", val)
}
}
func (cmd *Cmd) StringSlice() ([]string, error) {
slice, err := cmd.Slice()
if err != nil {
return nil, err
}
ss := make([]string, len(slice))
for i, iface := range slice {
val, err := toString(iface)
if err != nil {
return nil, err
}
ss[i] = val
}
return ss, nil
}
func (cmd *Cmd) Int64Slice() ([]int64, error) {
slice, err := cmd.Slice()
if err != nil {
return nil, err
}
nums := make([]int64, len(slice))
for i, iface := range slice {
val, err := toInt64(iface)
if err != nil {
return nil, err
}
nums[i] = val
}
return nums, nil
}
func (cmd *Cmd) Uint64Slice() ([]uint64, error) {
slice, err := cmd.Slice()
if err != nil {
return nil, err
}
nums := make([]uint64, len(slice))
for i, iface := range slice {
val, err := toUint64(iface)
if err != nil {
return nil, err
}
nums[i] = val
}
return nums, nil
}
func (cmd *Cmd) Float32Slice() ([]float32, error) {
slice, err := cmd.Slice()
if err != nil {
return nil, err
}
floats := make([]float32, len(slice))
for i, iface := range slice {
val, err := toFloat32(iface)
if err != nil {
return nil, err
}
floats[i] = val
}
return floats, nil
}
func (cmd *Cmd) Float64Slice() ([]float64, error) {
slice, err := cmd.Slice()
if err != nil {
return nil, err
}
floats := make([]float64, len(slice))
for i, iface := range slice {
val, err := toFloat64(iface)
if err != nil {
return nil, err
}
floats[i] = val
}
return floats, nil
}
func (cmd *Cmd) BoolSlice() ([]bool, error) {
slice, err := cmd.Slice()
if err != nil {
return nil, err
}
bools := make([]bool, len(slice))
for i, iface := range slice {
val, err := toBool(iface)
if err != nil {
return nil, err
}
bools[i] = val
}
return bools, nil
}
func (cmd *Cmd) readReply(rd *proto.Reader) (err error) {
cmd.val, err = rd.ReadReply()
return err
}
func (cmd *Cmd) Clone() Cmder {
return &Cmd{
baseCmd: cmd.cloneBaseCmd(),
val: cmd.val,
}
}
//------------------------------------------------------------------------------
type SliceCmd struct {
baseCmd
val []interface{}
}
var _ Cmder = (*SliceCmd)(nil)
func NewSliceCmd(ctx context.Context, args ...interface{}) *SliceCmd {
return &SliceCmd{
baseCmd: baseCmd{
ctx: ctx,
args: args,
cmdType: CmdTypeSlice,
},
}
}
func (cmd *SliceCmd) SetVal(val []interface{}) {
cmd.val = val
}
func (cmd *SliceCmd) Val() []interface{} {
return cmd.val
}
func (cmd *SliceCmd) Result() ([]interface{}, error) {
return cmd.val, cmd.err
}
func (cmd *SliceCmd) String() string {
return cmdString(cmd, cmd.val)
}
// Scan scans the results from the map into a destination struct. The map keys
// are matched in the Redis struct fields by the `redis:"field"` tag.
func (cmd *SliceCmd) Scan(dst interface{}) error {
if cmd.err != nil {
return cmd.err
}
// Pass the list of keys and values.
// Skip the first two args for: HMGET key
var args []interface{}
if cmd.args[0] == "hmget" {
args = cmd.args[2:]
} else {
// Otherwise, it's: MGET field field ...
args = cmd.args[1:]
}
return hscan.Scan(dst, args, cmd.val)
}
func (cmd *SliceCmd) readReply(rd *proto.Reader) (err error) {
cmd.val, err = rd.ReadSlice()
return err
}
func (cmd *SliceCmd) Clone() Cmder {
var val []interface{}
if cmd.val != nil {
val = make([]interface{}, len(cmd.val))
copy(val, cmd.val)
}
return &SliceCmd{
baseCmd: cmd.cloneBaseCmd(),
val: val,
}
}
//------------------------------------------------------------------------------
type StatusCmd struct {
baseCmd
val string
}
var _ Cmder = (*StatusCmd)(nil)
func NewStatusCmd(ctx context.Context, args ...interface{}) *StatusCmd {
return &StatusCmd{
baseCmd: baseCmd{
ctx: ctx,
args: args,
cmdType: CmdTypeStatus,
},
}
}
func (cmd *StatusCmd) SetVal(val string) {
cmd.val = val
}
func (cmd *StatusCmd) Val() string {
return cmd.val
}
func (cmd *StatusCmd) Result() (string, error) {
return cmd.val, cmd.err
}
func (cmd *StatusCmd) Bytes() ([]byte, error) {
return util.StringToBytes(cmd.val), cmd.err
}
func (cmd *StatusCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *StatusCmd) readReply(rd *proto.Reader) (err error) {
cmd.val, err = rd.ReadString()
return err
}
func (cmd *StatusCmd) Clone() Cmder {
return &StatusCmd{
baseCmd: cmd.cloneBaseCmd(),
val: cmd.val,
}
}
//------------------------------------------------------------------------------
type IntCmd struct {
baseCmd
val int64
}
var _ Cmder = (*IntCmd)(nil)
func NewIntCmd(ctx context.Context, args ...interface{}) *IntCmd {
return &IntCmd{
baseCmd: baseCmd{
ctx: ctx,
args: args,
cmdType: CmdTypeInt,
},
}
}
func (cmd *IntCmd) SetVal(val int64) {
cmd.val = val
}
func (cmd *IntCmd) Val() int64 {
return cmd.val
}
func (cmd *IntCmd) Result() (int64, error) {
return cmd.val, cmd.err
}
func (cmd *IntCmd) Uint64() (uint64, error) {
return uint64(cmd.val), cmd.err
}
func (cmd *IntCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *IntCmd) readReply(rd *proto.Reader) (err error) {
cmd.val, err = rd.ReadInt()
return err
}
func (cmd *IntCmd) Clone() Cmder {
return &IntCmd{
baseCmd: cmd.cloneBaseCmd(),
val: cmd.val,
}
}
//------------------------------------------------------------------------------
// DigestCmd is a command that returns a uint64 xxh3 hash digest.
//
// This command is specifically designed for the Redis DIGEST command,
// which returns the xxh3 hash of a key's value as a hex string.
// The hex string is automatically parsed to a uint64 value.
//
// The digest can be used for optimistic locking with SetIFDEQ, SetIFDNE,
// and DelExArgs commands.
//
// For examples of client-side digest generation and usage patterns, see:
// example/digest-optimistic-locking/
//
// Redis 8.4+. See https://redis.io/commands/digest/
type DigestCmd struct {
baseCmd
val uint64
}
var _ Cmder = (*DigestCmd)(nil)
func NewDigestCmd(ctx context.Context, args ...interface{}) *DigestCmd {
return &DigestCmd{
baseCmd: baseCmd{
ctx: ctx,
args: args,
},
}
}
func (cmd *DigestCmd) SetVal(val uint64) {
cmd.val = val
}
func (cmd *DigestCmd) Val() uint64 {
return cmd.val
}
func (cmd *DigestCmd) Result() (uint64, error) {
return cmd.val, cmd.err
}
func (cmd *DigestCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *DigestCmd) Clone() Cmder {
return &DigestCmd{
baseCmd: cmd.cloneBaseCmd(),
val: cmd.val,
}
}
func (cmd *DigestCmd) readReply(rd *proto.Reader) (err error) {
// Redis DIGEST command returns a hex string (e.g., "a1b2c3d4e5f67890")
// We parse it as a uint64 xxh3 hash value
var hexStr string
hexStr, err = rd.ReadString()
if err != nil {
return err
}
// Parse hex string to uint64
cmd.val, err = strconv.ParseUint(hexStr, 16, 64)
return err
}
//------------------------------------------------------------------------------
type IntSliceCmd struct {
baseCmd
val []int64
}
var _ Cmder = (*IntSliceCmd)(nil)
func NewIntSliceCmd(ctx context.Context, args ...interface{}) *IntSliceCmd {
return &IntSliceCmd{
baseCmd: baseCmd{
ctx: ctx,
args: args,
cmdType: CmdTypeIntSlice,
},
}
}
func (cmd *IntSliceCmd) SetVal(val []int64) {
cmd.val = val
}
func (cmd *IntSliceCmd) Val() []int64 {
return cmd.val
}
func (cmd *IntSliceCmd) Result() ([]int64, error) {
return cmd.val, cmd.err
}
func (cmd *IntSliceCmd) String() string {
return cmdString(cmd, cmd.val)
}