redis/command.go

998 lines
18 KiB
Go

package redis
import (
"bytes"
"fmt"
"strconv"
"strings"
"time"
"gopkg.in/redis.v5/internal"
"gopkg.in/redis.v5/internal/pool"
"gopkg.in/redis.v5/internal/proto"
)
var (
_ Cmder = (*Cmd)(nil)
_ Cmder = (*SliceCmd)(nil)
_ Cmder = (*StatusCmd)(nil)
_ Cmder = (*IntCmd)(nil)
_ Cmder = (*DurationCmd)(nil)
_ Cmder = (*BoolCmd)(nil)
_ Cmder = (*StringCmd)(nil)
_ Cmder = (*FloatCmd)(nil)
_ Cmder = (*StringSliceCmd)(nil)
_ Cmder = (*BoolSliceCmd)(nil)
_ Cmder = (*StringStringMapCmd)(nil)
_ Cmder = (*StringIntMapCmd)(nil)
_ Cmder = (*ZSliceCmd)(nil)
_ Cmder = (*ScanCmd)(nil)
_ Cmder = (*ClusterSlotsCmd)(nil)
)
type Cmder interface {
args() []interface{}
arg(int) string
readReply(*pool.Conn) error
setErr(error)
reset()
readTimeout() *time.Duration
Err() error
fmt.Stringer
}
func setCmdsErr(cmds []Cmder, e error) {
for _, cmd := range cmds {
cmd.setErr(e)
}
}
func resetCmds(cmds []Cmder) {
for _, cmd := range cmds {
cmd.reset()
}
}
func writeCmd(cn *pool.Conn, cmds ...Cmder) error {
cn.Wb.Reset()
for _, cmd := range cmds {
if err := cn.Wb.Append(cmd.args()); err != nil {
return err
}
}
_, err := cn.Write(cn.Wb.Bytes())
return err
}
func cmdString(cmd Cmder, val interface{}) string {
var ss []string
for _, arg := range cmd.args() {
ss = append(ss, fmt.Sprint(arg))
}
s := strings.Join(ss, " ")
if err := cmd.Err(); err != nil {
return s + ": " + err.Error()
}
if val != nil {
switch vv := val.(type) {
case []byte:
return s + ": " + string(vv)
default:
return s + ": " + fmt.Sprint(val)
}
}
return s
}
func cmdFirstKeyPos(cmd Cmder, info *CommandInfo) int {
switch cmd.arg(0) {
case "eval", "evalsha":
if cmd.arg(2) != "0" {
return 3
} else {
return 0
}
}
if info == nil {
internal.Logf("info for cmd=%s not found", cmd.arg(0))
return -1
}
return int(info.FirstKeyPos)
}
//------------------------------------------------------------------------------
type baseCmd struct {
_args []interface{}
err error
_readTimeout *time.Duration
}
func (cmd *baseCmd) Err() error {
if cmd.err != nil {
return cmd.err
}
return nil
}
func (cmd *baseCmd) args() []interface{} {
return cmd._args
}
func (cmd *baseCmd) arg(pos int) string {
if pos < 0 || pos >= len(cmd._args) {
return ""
}
s, _ := cmd._args[pos].(string)
return s
}
func (cmd *baseCmd) readTimeout() *time.Duration {
return cmd._readTimeout
}
func (cmd *baseCmd) setReadTimeout(d time.Duration) {
cmd._readTimeout = &d
}
func (cmd *baseCmd) setErr(e error) {
cmd.err = e
}
func newBaseCmd(args []interface{}) baseCmd {
if len(args) > 0 {
// Cmd name is expected to be in lower case.
args[0] = internal.ToLower(args[0].(string))
}
return baseCmd{_args: args}
}
//------------------------------------------------------------------------------
type Cmd struct {
baseCmd
val interface{}
}
func NewCmd(args ...interface{}) *Cmd {
return &Cmd{
baseCmd: newBaseCmd(args),
}
}
func (cmd *Cmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *Cmd) Val() interface{} {
return cmd.val
}
func (cmd *Cmd) Result() (interface{}, error) {
return cmd.val, cmd.err
}
func (cmd *Cmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *Cmd) readReply(cn *pool.Conn) error {
val, err := cn.Rd.ReadReply(sliceParser)
if err != nil {
cmd.err = err
return cmd.err
}
if b, ok := val.([]byte); ok {
// Bytes must be copied, because underlying memory is reused.
cmd.val = string(b)
} else {
cmd.val = val
}
return nil
}
//------------------------------------------------------------------------------
type SliceCmd struct {
baseCmd
val []interface{}
}
func NewSliceCmd(args ...interface{}) *SliceCmd {
cmd := newBaseCmd(args)
return &SliceCmd{baseCmd: cmd}
}
func (cmd *SliceCmd) reset() {
cmd.val = nil
cmd.err = nil
}
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)
}
func (cmd *SliceCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(sliceParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.([]interface{})
return nil
}
//------------------------------------------------------------------------------
type StatusCmd struct {
baseCmd
val string
}
func NewStatusCmd(args ...interface{}) *StatusCmd {
cmd := newBaseCmd(args)
return &StatusCmd{baseCmd: cmd}
}
func (cmd *StatusCmd) reset() {
cmd.val = ""
cmd.err = nil
}
func (cmd *StatusCmd) Val() string {
return cmd.val
}
func (cmd *StatusCmd) Result() (string, error) {
return cmd.val, cmd.err
}
func (cmd *StatusCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *StatusCmd) readReply(cn *pool.Conn) error {
cmd.val, cmd.err = cn.Rd.ReadStringReply()
return cmd.err
}
//------------------------------------------------------------------------------
type IntCmd struct {
baseCmd
val int64
}
func NewIntCmd(args ...interface{}) *IntCmd {
cmd := newBaseCmd(args)
return &IntCmd{baseCmd: cmd}
}
func (cmd *IntCmd) reset() {
cmd.val = 0
cmd.err = nil
}
func (cmd *IntCmd) Val() int64 {
return cmd.val
}
func (cmd *IntCmd) Result() (int64, error) {
return cmd.val, cmd.err
}
func (cmd *IntCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *IntCmd) readReply(cn *pool.Conn) error {
cmd.val, cmd.err = cn.Rd.ReadIntReply()
return cmd.err
}
//------------------------------------------------------------------------------
type DurationCmd struct {
baseCmd
val time.Duration
precision time.Duration
}
func NewDurationCmd(precision time.Duration, args ...interface{}) *DurationCmd {
cmd := newBaseCmd(args)
return &DurationCmd{
precision: precision,
baseCmd: cmd,
}
}
func (cmd *DurationCmd) reset() {
cmd.val = 0
cmd.err = nil
}
func (cmd *DurationCmd) Val() time.Duration {
return cmd.val
}
func (cmd *DurationCmd) Result() (time.Duration, error) {
return cmd.val, cmd.err
}
func (cmd *DurationCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *DurationCmd) readReply(cn *pool.Conn) error {
n, err := cn.Rd.ReadIntReply()
if err != nil {
cmd.err = err
return err
}
cmd.val = time.Duration(n) * cmd.precision
return nil
}
//------------------------------------------------------------------------------
type BoolCmd struct {
baseCmd
val bool
}
func NewBoolCmd(args ...interface{}) *BoolCmd {
cmd := newBaseCmd(args)
return &BoolCmd{baseCmd: cmd}
}
func (cmd *BoolCmd) reset() {
cmd.val = false
cmd.err = nil
}
func (cmd *BoolCmd) Val() bool {
return cmd.val
}
func (cmd *BoolCmd) Result() (bool, error) {
return cmd.val, cmd.err
}
func (cmd *BoolCmd) String() string {
return cmdString(cmd, cmd.val)
}
var ok = []byte("OK")
func (cmd *BoolCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadReply(nil)
// `SET key value NX` returns nil when key already exists. But
// `SETNX key value` returns bool (0/1). So convert nil to bool.
// TODO: is this okay?
if err == Nil {
cmd.val = false
return nil
}
if err != nil {
cmd.err = err
return err
}
switch vv := v.(type) {
case int64:
cmd.val = vv == 1
return nil
case []byte:
cmd.val = bytes.Equal(vv, ok)
return nil
default:
return fmt.Errorf("got %T, wanted int64 or string", v)
}
}
//------------------------------------------------------------------------------
type StringCmd struct {
baseCmd
val []byte
}
func NewStringCmd(args ...interface{}) *StringCmd {
cmd := newBaseCmd(args)
return &StringCmd{baseCmd: cmd}
}
func (cmd *StringCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *StringCmd) Val() string {
return string(cmd.val)
}
func (cmd *StringCmd) Result() (string, error) {
return cmd.Val(), cmd.err
}
func (cmd *StringCmd) Bytes() ([]byte, error) {
return cmd.val, cmd.err
}
func (cmd *StringCmd) Int64() (int64, error) {
if cmd.err != nil {
return 0, cmd.err
}
return strconv.ParseInt(cmd.Val(), 10, 64)
}
func (cmd *StringCmd) Uint64() (uint64, error) {
if cmd.err != nil {
return 0, cmd.err
}
return strconv.ParseUint(cmd.Val(), 10, 64)
}
func (cmd *StringCmd) Float64() (float64, error) {
if cmd.err != nil {
return 0, cmd.err
}
return strconv.ParseFloat(cmd.Val(), 64)
}
func (cmd *StringCmd) Scan(val interface{}) error {
if cmd.err != nil {
return cmd.err
}
return proto.Scan(cmd.val, val)
}
func (cmd *StringCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *StringCmd) readReply(cn *pool.Conn) error {
b, err := cn.Rd.ReadBytesReply()
if err != nil {
cmd.err = err
return err
}
new := make([]byte, len(b))
copy(new, b)
cmd.val = new
return nil
}
//------------------------------------------------------------------------------
type FloatCmd struct {
baseCmd
val float64
}
func NewFloatCmd(args ...interface{}) *FloatCmd {
cmd := newBaseCmd(args)
return &FloatCmd{baseCmd: cmd}
}
func (cmd *FloatCmd) reset() {
cmd.val = 0
cmd.err = nil
}
func (cmd *FloatCmd) Val() float64 {
return cmd.val
}
func (cmd *FloatCmd) Result() (float64, error) {
return cmd.Val(), cmd.Err()
}
func (cmd *FloatCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *FloatCmd) readReply(cn *pool.Conn) error {
cmd.val, cmd.err = cn.Rd.ReadFloatReply()
return cmd.err
}
//------------------------------------------------------------------------------
type StringSliceCmd struct {
baseCmd
val []string
}
func NewStringSliceCmd(args ...interface{}) *StringSliceCmd {
cmd := newBaseCmd(args)
return &StringSliceCmd{baseCmd: cmd}
}
func (cmd *StringSliceCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *StringSliceCmd) Val() []string {
return cmd.val
}
func (cmd *StringSliceCmd) Result() ([]string, error) {
return cmd.Val(), cmd.Err()
}
func (cmd *StringSliceCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *StringSliceCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(stringSliceParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.([]string)
return nil
}
//------------------------------------------------------------------------------
type BoolSliceCmd struct {
baseCmd
val []bool
}
func NewBoolSliceCmd(args ...interface{}) *BoolSliceCmd {
cmd := newBaseCmd(args)
return &BoolSliceCmd{baseCmd: cmd}
}
func (cmd *BoolSliceCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *BoolSliceCmd) Val() []bool {
return cmd.val
}
func (cmd *BoolSliceCmd) Result() ([]bool, error) {
return cmd.val, cmd.err
}
func (cmd *BoolSliceCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *BoolSliceCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(boolSliceParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.([]bool)
return nil
}
//------------------------------------------------------------------------------
type StringStringMapCmd struct {
baseCmd
val map[string]string
}
func NewStringStringMapCmd(args ...interface{}) *StringStringMapCmd {
cmd := newBaseCmd(args)
return &StringStringMapCmd{baseCmd: cmd}
}
func (cmd *StringStringMapCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *StringStringMapCmd) Val() map[string]string {
return cmd.val
}
func (cmd *StringStringMapCmd) Result() (map[string]string, error) {
return cmd.val, cmd.err
}
func (cmd *StringStringMapCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *StringStringMapCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(stringStringMapParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.(map[string]string)
return nil
}
//------------------------------------------------------------------------------
type StringIntMapCmd struct {
baseCmd
val map[string]int64
}
func NewStringIntMapCmd(args ...interface{}) *StringIntMapCmd {
cmd := newBaseCmd(args)
return &StringIntMapCmd{baseCmd: cmd}
}
func (cmd *StringIntMapCmd) Val() map[string]int64 {
return cmd.val
}
func (cmd *StringIntMapCmd) Result() (map[string]int64, error) {
return cmd.val, cmd.err
}
func (cmd *StringIntMapCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *StringIntMapCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *StringIntMapCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(stringIntMapParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.(map[string]int64)
return nil
}
//------------------------------------------------------------------------------
type ZSliceCmd struct {
baseCmd
val []Z
}
func NewZSliceCmd(args ...interface{}) *ZSliceCmd {
cmd := newBaseCmd(args)
return &ZSliceCmd{baseCmd: cmd}
}
func (cmd *ZSliceCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *ZSliceCmd) Val() []Z {
return cmd.val
}
func (cmd *ZSliceCmd) Result() ([]Z, error) {
return cmd.val, cmd.err
}
func (cmd *ZSliceCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *ZSliceCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(zSliceParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.([]Z)
return nil
}
//------------------------------------------------------------------------------
type ScanCmd struct {
baseCmd
page []string
cursor uint64
}
func NewScanCmd(args ...interface{}) *ScanCmd {
cmd := newBaseCmd(args)
return &ScanCmd{
baseCmd: cmd,
}
}
func (cmd *ScanCmd) reset() {
cmd.cursor = 0
cmd.page = nil
cmd.err = nil
}
func (cmd *ScanCmd) Val() (keys []string, cursor uint64) {
return cmd.page, cmd.cursor
}
func (cmd *ScanCmd) Result() (keys []string, cursor uint64, err error) {
return cmd.page, cmd.cursor, cmd.err
}
func (cmd *ScanCmd) String() string {
return cmdString(cmd, cmd.page)
}
func (cmd *ScanCmd) readReply(cn *pool.Conn) error {
page, cursor, err := cn.Rd.ReadScanReply()
if err != nil {
cmd.err = err
return cmd.err
}
cmd.page = page
cmd.cursor = cursor
return nil
}
//------------------------------------------------------------------------------
type ClusterNode struct {
Id string
Addr string
}
type ClusterSlot struct {
Start int
End int
Nodes []ClusterNode
}
type ClusterSlotsCmd struct {
baseCmd
val []ClusterSlot
}
func NewClusterSlotsCmd(args ...interface{}) *ClusterSlotsCmd {
cmd := newBaseCmd(args)
return &ClusterSlotsCmd{baseCmd: cmd}
}
func (cmd *ClusterSlotsCmd) Val() []ClusterSlot {
return cmd.val
}
func (cmd *ClusterSlotsCmd) Result() ([]ClusterSlot, error) {
return cmd.Val(), cmd.Err()
}
func (cmd *ClusterSlotsCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *ClusterSlotsCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *ClusterSlotsCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(clusterSlotsParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.([]ClusterSlot)
return nil
}
//------------------------------------------------------------------------------
// GeoLocation is used with GeoAdd to add geospatial location.
type GeoLocation struct {
Name string
Longitude, Latitude, Dist float64
GeoHash int64
}
// GeoRadiusQuery is used with GeoRadius to query geospatial index.
type GeoRadiusQuery struct {
Radius float64
// Can be m, km, ft, or mi. Default is km.
Unit string
WithCoord bool
WithDist bool
WithGeoHash bool
Count int
// Can be ASC or DESC. Default is no sort order.
Sort string
}
type GeoLocationCmd struct {
baseCmd
q *GeoRadiusQuery
locations []GeoLocation
}
func NewGeoLocationCmd(q *GeoRadiusQuery, args ...interface{}) *GeoLocationCmd {
args = append(args, q.Radius)
if q.Unit != "" {
args = append(args, q.Unit)
} else {
args = append(args, "km")
}
if q.WithCoord {
args = append(args, "WITHCOORD")
}
if q.WithDist {
args = append(args, "WITHDIST")
}
if q.WithGeoHash {
args = append(args, "WITHHASH")
}
if q.Count > 0 {
args = append(args, "COUNT", q.Count)
}
if q.Sort != "" {
args = append(args, q.Sort)
}
cmd := newBaseCmd(args)
return &GeoLocationCmd{
baseCmd: cmd,
q: q,
}
}
func (cmd *GeoLocationCmd) reset() {
cmd.locations = nil
cmd.err = nil
}
func (cmd *GeoLocationCmd) Val() []GeoLocation {
return cmd.locations
}
func (cmd *GeoLocationCmd) Result() ([]GeoLocation, error) {
return cmd.locations, cmd.err
}
func (cmd *GeoLocationCmd) String() string {
return cmdString(cmd, cmd.locations)
}
func (cmd *GeoLocationCmd) readReply(cn *pool.Conn) error {
reply, err := cn.Rd.ReadArrayReply(newGeoLocationSliceParser(cmd.q))
if err != nil {
cmd.err = err
return err
}
cmd.locations = reply.([]GeoLocation)
return nil
}
//------------------------------------------------------------------------------
type GeoPos struct {
Longitude, Latitude float64
}
type GeoPosCmd struct {
baseCmd
positions []*GeoPos
}
func NewGeoPosCmd(args ...interface{}) *GeoPosCmd {
cmd := newBaseCmd(args)
return &GeoPosCmd{baseCmd: cmd}
}
func (cmd *GeoPosCmd) Val() []*GeoPos {
return cmd.positions
}
func (cmd *GeoPosCmd) Result() ([]*GeoPos, error) {
return cmd.Val(), cmd.Err()
}
func (cmd *GeoPosCmd) String() string {
return cmdString(cmd, cmd.positions)
}
func (cmd *GeoPosCmd) reset() {
cmd.positions = nil
cmd.err = nil
}
func (cmd *GeoPosCmd) readReply(cn *pool.Conn) error {
reply, err := cn.Rd.ReadArrayReply(geoPosSliceParser)
if err != nil {
cmd.err = err
return err
}
cmd.positions = reply.([]*GeoPos)
return nil
}
//------------------------------------------------------------------------------
type CommandInfo struct {
Name string
Arity int8
Flags []string
FirstKeyPos int8
LastKeyPos int8
StepCount int8
ReadOnly bool
}
type CommandsInfoCmd struct {
baseCmd
val map[string]*CommandInfo
}
func NewCommandsInfoCmd(args ...interface{}) *CommandsInfoCmd {
cmd := newBaseCmd(args)
return &CommandsInfoCmd{baseCmd: cmd}
}
func (cmd *CommandsInfoCmd) Val() map[string]*CommandInfo {
return cmd.val
}
func (cmd *CommandsInfoCmd) Result() (map[string]*CommandInfo, error) {
return cmd.Val(), cmd.Err()
}
func (cmd *CommandsInfoCmd) String() string {
return cmdString(cmd, cmd.val)
}
func (cmd *CommandsInfoCmd) reset() {
cmd.val = nil
cmd.err = nil
}
func (cmd *CommandsInfoCmd) readReply(cn *pool.Conn) error {
v, err := cn.Rd.ReadArrayReply(commandInfoSliceParser)
if err != nil {
cmd.err = err
return err
}
cmd.val = v.(map[string]*CommandInfo)
return nil
}