Refactor reply parser.

cluster_pipeline.go

@@ -100,7 +100,7 @@ func (pipe *ClusterPipeline) execClusterCmds(
 
 	var firstCmdErr error
 	for i, cmd := range cmds {
-		err := cmd.parseReply(cn)
+		err := cmd.readReply(cn)
 		if err == nil {
 			continue
 		}

command.go

@@ -28,7 +28,7 @@ var (
 
 type Cmder interface {
 	args() []interface{}
-	parseReply(*conn) error
+	readReply(*conn) error
 	setErr(error)
 	reset()
 
@@ -152,14 +152,20 @@ func (cmd *Cmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *Cmd) parseReply(cn *conn) error {
+func (cmd *Cmd) readReply(cn *conn) error {
-	cmd.val, cmd.err = parseReply(cn, parseSlice)
+	val, err := readReply(cn, sliceParser)
+	if err != nil {
+		cmd.err = err
+		return cmd.err
+	}
+	if v, ok := val.([]byte); ok {
 		// Convert to string to preserve old behaviour.
 		// TODO: remove in v4
-	if v, ok := cmd.val.([]byte); ok {
 		cmd.val = string(v)
+	} else {
+		cmd.val = val
 	}
-	return cmd.err
+	return nil
 }
 
 //------------------------------------------------------------------------------
@@ -191,8 +197,8 @@ func (cmd *SliceCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *SliceCmd) parseReply(cn *conn) error {
+func (cmd *SliceCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseSlice)
+	v, err := readReply(cn, sliceParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -234,8 +240,8 @@ func (cmd *StatusCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *StatusCmd) parseReply(cn *conn) error {
+func (cmd *StatusCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, nil)
+	v, err := readReply(cn, nil)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -273,8 +279,8 @@ func (cmd *IntCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *IntCmd) parseReply(cn *conn) error {
+func (cmd *IntCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, nil)
+	v, err := readReply(cn, nil)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -316,8 +322,8 @@ func (cmd *DurationCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *DurationCmd) parseReply(cn *conn) error {
+func (cmd *DurationCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, nil)
+	v, err := readReply(cn, nil)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -357,8 +363,8 @@ func (cmd *BoolCmd) String() string {
 
 var ok = []byte("OK")
 
-func (cmd *BoolCmd) parseReply(cn *conn) error {
+func (cmd *BoolCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, nil)
+	v, err := readReply(cn, nil)
 	// `SET key value NX` returns nil when key already exists, which
 	// is inconsistent with `SETNX key value`.
 	// TODO: is this okay?
@@ -443,8 +449,8 @@ func (cmd *StringCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *StringCmd) parseReply(cn *conn) error {
+func (cmd *StringCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, nil)
+	v, err := readReply(cn, nil)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -482,8 +488,8 @@ func (cmd *FloatCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *FloatCmd) parseReply(cn *conn) error {
+func (cmd *FloatCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, nil)
+	v, err := readReply(cn, nil)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -522,8 +528,8 @@ func (cmd *StringSliceCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *StringSliceCmd) parseReply(cn *conn) error {
+func (cmd *StringSliceCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseStringSlice)
+	v, err := readReply(cn, stringSliceParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -561,8 +567,8 @@ func (cmd *BoolSliceCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *BoolSliceCmd) parseReply(cn *conn) error {
+func (cmd *BoolSliceCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseBoolSlice)
+	v, err := readReply(cn, boolSliceParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -600,8 +606,8 @@ func (cmd *StringStringMapCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *StringStringMapCmd) parseReply(cn *conn) error {
+func (cmd *StringStringMapCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseStringStringMap)
+	v, err := readReply(cn, stringStringMapParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -639,8 +645,8 @@ func (cmd *StringIntMapCmd) reset() {
 	cmd.err = nil
 }
 
-func (cmd *StringIntMapCmd) parseReply(cn *conn) error {
+func (cmd *StringIntMapCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseStringIntMap)
+	v, err := readReply(cn, stringIntMapParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -678,8 +684,8 @@ func (cmd *ZSliceCmd) String() string {
 	return cmdString(cmd, cmd.val)
 }
 
-func (cmd *ZSliceCmd) parseReply(cn *conn) error {
+func (cmd *ZSliceCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseZSlice)
+	v, err := readReply(cn, zSliceParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -719,8 +725,8 @@ func (cmd *ScanCmd) String() string {
 	return cmdString(cmd, cmd.keys)
 }
 
-func (cmd *ScanCmd) parseReply(cn *conn) error {
+func (cmd *ScanCmd) readReply(cn *conn) error {
-	vi, err := parseReply(cn, parseSlice)
+	vi, err := readReply(cn, sliceParser)
 	if err != nil {
 		cmd.err = err
 		return cmd.err
@@ -743,7 +749,8 @@ func (cmd *ScanCmd) parseReply(cn *conn) error {
 //------------------------------------------------------------------------------
 
 type ClusterSlotInfo struct {
-	Start, End int
+	Start int
+	End   int
 	Addrs []string
 }
 
@@ -774,8 +781,8 @@ func (cmd *ClusterSlotCmd) reset() {
 	cmd.err = nil
 }
 
-func (cmd *ClusterSlotCmd) parseReply(cn *conn) error {
+func (cmd *ClusterSlotCmd) readReply(cn *conn) error {
-	v, err := parseReply(cn, parseClusterSlotInfoSlice)
+	v, err := readReply(cn, clusterSlotInfoSliceParser)
 	if err != nil {
 		cmd.err = err
 		return err
@@ -786,99 +793,62 @@ func (cmd *ClusterSlotCmd) parseReply(cn *conn) error {
 
 //------------------------------------------------------------------------------
 
-// Location type for GEO operations in Redis
+// GeoLocation is used with GeoAdd to add geospatial location.
 type GeoLocation struct {
 	Name                          string
 	Longitude, Latitude, Distance float64
 	GeoHash                       int64
 }
 
-type GeoCmd struct {
+// GeoRadiusQuery is used with GeoRadius to query geospatial index.
+type GeoRadiusQuery struct {
+	Key       string
+	Longitude float64
+	Latitude  float64
+	Radius    float64
+	// Can be m, km, ft, or mi. Default is km.
+	Unit            string
+	WithCoordinates bool
+	WithDistance    bool
+	WithGeoHash     bool
+	Count           int
+	// Can be ASC or DESC. Default is no sort order.
+	Sort string
+}
+
+type GeoLocationCmd struct {
 	baseCmd
 
 	locations []GeoLocation
 }
 
-// Query type for geo radius
+func NewGeoLocationCmd(args ...interface{}) *GeoLocationCmd {
-type GeoRadiusQuery struct {
+	return &GeoLocationCmd{baseCmd: baseCmd{_args: args, _clusterKeyPos: 1}}
-	Key string
-	Longitude, Latitude, Radius float64
-	// Unit default to km when nil
-	Unit string
-	WithCoordinates, WithDistance, WithGeoHash bool
-	// Count default to 0 and ignored limit.
-	Count int
-	// Sort default to unsorted, ASC or DESC otherwise
-	Sort string
 }
 
-func NewGeoCmd(args ...interface{}) *GeoCmd {
+func (cmd *GeoLocationCmd) reset() {
-	return &GeoCmd{baseCmd: baseCmd{_args: args, _clusterKeyPos: 1}}
-}
-
-func (cmd *GeoCmd) reset() {
 	cmd.locations = nil
 	cmd.err = nil
 }
 
-func (cmd *GeoCmd) Val() ([]GeoLocation) {
+func (cmd *GeoLocationCmd) Val() []GeoLocation {
 	return cmd.locations
 }
 
-func (cmd *GeoCmd) Result() ([]GeoLocation, error) {
+func (cmd *GeoLocationCmd) Result() ([]GeoLocation, error) {
 	return cmd.locations, cmd.err
 }
 
-func (cmd *GeoCmd) String() string {
+func (cmd *GeoLocationCmd) String() string {
 	return cmdString(cmd, cmd.locations)
 }
 
-func (cmd *GeoCmd) parseReply(cn *conn) error {
+func (cmd *GeoLocationCmd) readReply(cn *conn) error {
-	vi, err := parseReply(cn, parseSlice)
+	reply, err := readReply(cn, geoLocationSliceParser)
 	if err != nil {
 		cmd.err = err
-		return cmd.err
-	}
-
-	v := vi.([]interface{})
-
-	if len(v) == 0 {
-		return nil
-	}
-
-	if _, ok := v[0].(string); ok { // Location names only (single level string array)
-		for _, keyi := range v {
-			cmd.locations = append(cmd.locations, GeoLocation{Name: keyi.(string)})
-		}
-	} else { // Full location details (nested arrays)
-		for _, keyi := range v {
-			tmpLocation := GeoLocation{}
-			keyiface := keyi.([]interface{})
-			for _, subKeyi := range keyiface {
-				if strVal, ok := subKeyi.(string); ok {
-					if len(tmpLocation.Name) == 0 {
-						tmpLocation.Name = strVal
-					} else {
-						tmpLocation.Distance, err = strconv.ParseFloat(strVal, 64)
-						if err != nil {
 		return err
 	}
-					}
+	cmd.locations = reply.([]GeoLocation)
-				} else if intVal, ok := subKeyi.(int64); ok {
-					tmpLocation.GeoHash = intVal
-				} else if ifcVal, ok := subKeyi.([]interface{}); ok {
-					tmpLocation.Longitude, err = strconv.ParseFloat(ifcVal[0].(string), 64)
-					if err != nil {
-						return err
-					}
-					tmpLocation.Latitude, err = strconv.ParseFloat(ifcVal[1].(string), 64)
-					if err != nil {
-						return err
-					}
-				}
-			}
-			cmd.locations = append(cmd.locations, tmpLocation)
-		}
-	}
 	return nil
 }

commands.go

@@ -1688,25 +1688,8 @@ func (c *commandable) GeoAdd(key string, geoLocation ...*GeoLocation) *IntCmd {
 	return cmd
 }
 
-func (c *commandable) GeoRadius(query *GeoRadiusQuery) *GeoCmd {
+func (c *commandable) GeoRadius(query *GeoRadiusQuery) *GeoLocationCmd {
-	var options, optionsCtr int
+	args := make([]interface{}, 6)
-	if query.WithCoordinates {
-		options++
-	}
-	if query.WithDistance {
-		options++
-	}
-	if query.WithGeoHash {
-		options++
-	}
-	if query.Count > 0 {
-		options += 2
-	}
-	if query.Sort != "" {
-		options++
-	}
-
-	args := make([]interface{}, 6 + options)
 	args[0] = "GEORADIUS"
 	args[1] = query.Key
 	args[2] = query.Longitude
@@ -1718,28 +1701,22 @@ func (c *commandable) GeoRadius(query *GeoRadiusQuery) *GeoCmd {
 		args[5] = "km"
 	}
 	if query.WithCoordinates {
-		args[6+optionsCtr] = "WITHCOORD"
+		args = append(args, "WITHCOORD")
-		optionsCtr++
 	}
 	if query.WithDistance {
-		args[6+optionsCtr] = "WITHDIST"
+		args = append(args, "WITHDIST")
-		optionsCtr++
 	}
 	if query.WithGeoHash {
-		args[6+optionsCtr] = "WITHHASH"
+		args = append(args, "WITHHASH")
-		optionsCtr++
 	}
 	if query.Count > 0 {
-		args[6+optionsCtr] = "COUNT"
+		args = append(args, "COUNT", query.Count)
-		optionsCtr++
-		args[6+optionsCtr] = query.Count
-		optionsCtr++
 	}
 	if query.Sort != "" {
-		args[6+optionsCtr] = query.Sort
+		args = append(args, query.Sort)
 	}
 
-	cmd := NewGeoCmd(args...)
+	cmd := NewGeoLocationCmd(args...)
 	c.Process(cmd)
 	return cmd
 }

multi.go

@@ -116,7 +116,7 @@ func (c *Multi) execCmds(cn *conn, cmds []Cmder) error {
 
 	// Parse queued replies.
 	for i := 0; i < cmdsLen; i++ {
-		if err := statusCmd.parseReply(cn); err != nil {
+		if err := statusCmd.readReply(cn); err != nil {
 			setCmdsErr(cmds[1:len(cmds)-1], err)
 			return err
 		}
@@ -144,7 +144,7 @@ func (c *Multi) execCmds(cn *conn, cmds []Cmder) error {
 	// Loop starts from 1 to omit MULTI cmd.
 	for i := 1; i < cmdsLen; i++ {
 		cmd := cmds[i]
-		if err := cmd.parseReply(cn); err != nil {
+		if err := cmd.readReply(cn); err != nil {
 			if firstCmdErr == nil {
 				firstCmdErr = err
 			}

parser.go

@@ -8,6 +8,14 @@ import (
 	"strconv"
 )
 
+const (
+	errorReply  = '-'
+	statusReply = '+'
+	intReply    = ':'
+	stringReply = '$'
+	arrayReply  = '*'
+)
+
 type multiBulkParser func(cn *conn, n int64) (interface{}, error)
 
 var (
@@ -239,24 +247,34 @@ func readN(cn *conn, n int) ([]byte, error) {
 
 //------------------------------------------------------------------------------
 
-func parseReply(cn *conn, p multiBulkParser) (interface{}, error) {
+func parseErrorReply(cn *conn, line []byte) error {
+	return errorf(string(line[1:]))
+}
+
+func parseIntReply(cn *conn, line []byte) (int64, error) {
+	n, err := strconv.ParseInt(bytesToString(line[1:]), 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	return n, nil
+}
+
+func readIntReply(cn *conn) (int64, error) {
 	line, err := readLine(cn)
 	if err != nil {
-		return nil, err
+		return 0, err
 	}
-
 	switch line[0] {
-	case '-':
+	case errorReply:
-		return nil, errorf(string(line[1:]))
+		return 0, parseErrorReply(cn, line)
-	case '+':
+	case intReply:
-		return line[1:], nil
+		return parseIntReply(cn, line)
-	case ':':
+	default:
-		v, err := strconv.ParseInt(bytesToString(line[1:]), 10, 64)
+		return 0, fmt.Errorf("readIntReply: can't parse %.100q", line)
-		if err != nil {
-			return nil, err
 	}
-		return v, nil
+}
-	case '$':
+
+func parseBytesReply(cn *conn, line []byte) ([]byte, error) {
 	if len(line) == 3 && line[1] == '-' && line[2] == '1' {
 		return nil, Nil
 	}
@@ -270,26 +288,116 @@ func parseReply(cn *conn, p multiBulkParser) (interface{}, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	return b[:replyLen], nil
-	case '*':
+}
+
+func readBytesReply(cn *conn) ([]byte, error) {
+	line, err := readLine(cn)
+	if err != nil {
+		return nil, err
+	}
+	switch line[0] {
+	case errorReply:
+		return nil, parseErrorReply(cn, line)
+	case stringReply:
+		return parseBytesReply(cn, line)
+	default:
+		return nil, fmt.Errorf("readBytesReply: can't parse %.100q", line)
+	}
+}
+
+func readStringReply(cn *conn) (string, error) {
+	b, err := readBytesReply(cn)
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
+
+func readFloatReply(cn *conn) (float64, error) {
+	b, err := readBytesReply(cn)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseFloat(bytesToString(b), 64)
+}
+
+func parseArrayHeader(cn *conn, line []byte) (int64, error) {
 	if len(line) == 3 && line[1] == '-' && line[2] == '1' {
-			return nil, Nil
+		return 0, Nil
 	}
 
-		repliesNum, err := strconv.ParseInt(bytesToString(line[1:]), 10, 64)
+	n, err := strconv.ParseInt(bytesToString(line[1:]), 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	return n, nil
+}
+
+func parseArrayReply(cn *conn, p multiBulkParser, line []byte) (interface{}, error) {
+	n, err := parseArrayHeader(cn, line)
+	if err != nil {
+		return nil, err
+	}
+	return p(cn, n)
+}
+
+func readArrayHeader(cn *conn) (int64, error) {
+	line, err := readLine(cn)
+	if err != nil {
+		return 0, err
+	}
+	switch line[0] {
+	case errorReply:
+		return 0, parseErrorReply(cn, line)
+	case arrayReply:
+		return parseArrayHeader(cn, line)
+	default:
+		return 0, fmt.Errorf("readArrayReply: can't parse %.100q", line)
+	}
+}
+
+func readArrayReply(cn *conn, p multiBulkParser) (interface{}, error) {
+	line, err := readLine(cn)
+	if err != nil {
+		return nil, err
+	}
+	switch line[0] {
+	case errorReply:
+		return nil, parseErrorReply(cn, line)
+	case arrayReply:
+		return parseArrayReply(cn, p, line)
+	default:
+		return nil, fmt.Errorf("readArrayReply: can't parse %.100q", line)
+	}
+}
+
+func readReply(cn *conn, p multiBulkParser) (interface{}, error) {
+	line, err := readLine(cn)
 	if err != nil {
 		return nil, err
 	}
 
-		return p(cn, repliesNum)
+	switch line[0] {
+	case errorReply:
+		return nil, parseErrorReply(cn, line)
+	case statusReply:
+		return line[1:], nil
+	case intReply:
+		return parseIntReply(cn, line)
+	case stringReply:
+		return parseBytesReply(cn, line)
+	case arrayReply:
+		return parseArrayReply(cn, p, line)
 	}
 	return nil, fmt.Errorf("redis: can't parse %q", line)
 }
 
-func parseSlice(cn *conn, n int64) (interface{}, error) {
+func sliceParser(cn *conn, n int64) (interface{}, error) {
 	vals := make([]interface{}, 0, n)
 	for i := int64(0); i < n; i++ {
-		v, err := parseReply(cn, parseSlice)
+		v, err := readReply(cn, sliceParser)
 		if err == Nil {
 			vals = append(vals, nil)
 		} else if err != nil {
@@ -306,171 +414,224 @@ func parseSlice(cn *conn, n int64) (interface{}, error) {
 	return vals, nil
 }
 
-func parseStringSlice(cn *conn, n int64) (interface{}, error) {
+func intSliceParser(cn *conn, n int64) (interface{}, error) {
-	vals := make([]string, 0, n)
+	ints := make([]int64, 0, n)
 	for i := int64(0); i < n; i++ {
-		viface, err := parseReply(cn, nil)
+		n, err := readIntReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		v, ok := viface.([]byte)
+		ints = append(ints, n)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected string", viface)
 	}
-		vals = append(vals, string(v))
+	return ints, nil
-	}
-	return vals, nil
 }
 
-func parseBoolSlice(cn *conn, n int64) (interface{}, error) {
+func boolSliceParser(cn *conn, n int64) (interface{}, error) {
-	vals := make([]bool, 0, n)
+	bools := make([]bool, 0, n)
 	for i := int64(0); i < n; i++ {
-		viface, err := parseReply(cn, nil)
+		n, err := readIntReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		v, ok := viface.(int64)
+		bools = append(bools, n == 1)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected int64", viface)
 	}
-		vals = append(vals, v == 1)
+	return bools, nil
-	}
-	return vals, nil
 }
 
-func parseStringStringMap(cn *conn, n int64) (interface{}, error) {
+func stringSliceParser(cn *conn, n int64) (interface{}, error) {
+	ss := make([]string, 0, n)
+	for i := int64(0); i < n; i++ {
+		s, err := readStringReply(cn)
+		if err != nil {
+			return nil, err
+		}
+		ss = append(ss, s)
+	}
+	return ss, nil
+}
+
+func floatSliceParser(cn *conn, n int64) (interface{}, error) {
+	nn := make([]float64, 0, n)
+	for i := int64(0); i < n; i++ {
+		n, err := readFloatReply(cn)
+		if err != nil {
+			return nil, err
+		}
+		nn = append(nn, n)
+	}
+	return nn, nil
+}
+
+func stringStringMapParser(cn *conn, n int64) (interface{}, error) {
 	m := make(map[string]string, n/2)
 	for i := int64(0); i < n; i += 2 {
-		keyIface, err := parseReply(cn, nil)
+		key, err := readStringReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		keyBytes, ok := keyIface.([]byte)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected []byte", keyIface)
-		}
-		key := string(keyBytes)
 
-		valueIface, err := parseReply(cn, nil)
+		value, err := readStringReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		valueBytes, ok := valueIface.([]byte)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected []byte", valueIface)
-		}
 
-		m[key] = string(valueBytes)
+		m[key] = value
 	}
 	return m, nil
 }
 
-func parseStringIntMap(cn *conn, n int64) (interface{}, error) {
+func stringIntMapParser(cn *conn, n int64) (interface{}, error) {
 	m := make(map[string]int64, n/2)
 	for i := int64(0); i < n; i += 2 {
-		keyiface, err := parseReply(cn, nil)
+		key, err := readStringReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		key, ok := keyiface.([]byte)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected string", keyiface)
-		}
 
-		valueiface, err := parseReply(cn, nil)
+		n, err := readIntReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		switch value := valueiface.(type) {
+
-		case int64:
+		m[key] = n
-			m[string(key)] = value
-		case string:
-			m[string(key)], err = strconv.ParseInt(value, 10, 64)
-			if err != nil {
-				return nil, fmt.Errorf("got %v, expected number", value)
-			}
-		default:
-			return nil, fmt.Errorf("got %T, expected number or string", valueiface)
-		}
 	}
 	return m, nil
 }
 
-func parseZSlice(cn *conn, n int64) (interface{}, error) {
+func zSliceParser(cn *conn, n int64) (interface{}, error) {
 	zz := make([]Z, n/2)
 	for i := int64(0); i < n; i += 2 {
+		var err error
+
 		z := &zz[i/2]
 
-		memberiface, err := parseReply(cn, nil)
+		z.Member, err = readStringReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		member, ok := memberiface.([]byte)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected string", memberiface)
-		}
-		z.Member = string(member)
 
-		scoreiface, err := parseReply(cn, nil)
+		z.Score, err = readFloatReply(cn)
 		if err != nil {
 			return nil, err
 		}
-		scoreb, ok := scoreiface.([]byte)
-		if !ok {
-			return nil, fmt.Errorf("got %T, expected string", scoreiface)
-		}
-		score, err := strconv.ParseFloat(bytesToString(scoreb), 64)
-		if err != nil {
-			return nil, err
-		}
-		z.Score = score
 	}
 	return zz, nil
 }
 
-func parseClusterSlotInfoSlice(cn *conn, n int64) (interface{}, error) {
+func clusterSlotInfoSliceParser(cn *conn, n int64) (interface{}, error) {
 	infos := make([]ClusterSlotInfo, 0, n)
 	for i := int64(0); i < n; i++ {
-		viface, err := parseReply(cn, parseSlice)
+		n, err := readArrayHeader(cn)
+		if err != nil {
+			return nil, err
+		}
+		if n < 2 {
+			return nil, fmt.Errorf("got %d elements in cluster info, expected at least 2", n)
+		}
+
+		start, err := readIntReply(cn)
 		if err != nil {
 			return nil, err
 		}
 
-		item, ok := viface.([]interface{})
+		end, err := readIntReply(cn)
-		if !ok {
+		if err != nil {
-			return nil, fmt.Errorf("got %T, expected []interface{}", viface)
+			return nil, err
-		} else if len(item) < 3 {
-			return nil, fmt.Errorf("got %v, expected {int64, int64, string...}", item)
 		}
 
-		start, ok := item[0].(int64)
+		addrsn := n - 2
-		if !ok || start < 0 || start > hashSlots {
+		info := ClusterSlotInfo{
-			return nil, fmt.Errorf("got %v, expected {int64, int64, string...}", item)
+			Start: int(start),
-		}
+			End:   int(end),
-		end, ok := item[1].(int64)
+			Addrs: make([]string, addrsn),
-		if !ok || end < 0 || end > hashSlots {
-			return nil, fmt.Errorf("got %v, expected {int64, int64, string...}", item)
 		}
 
-		info := ClusterSlotInfo{int(start), int(end), make([]string, len(item)-2)}
+		for i := int64(0); i < addrsn; i++ {
-		for n, ipair := range item[2:] {
+			n, err := readArrayHeader(cn)
-			pair, ok := ipair.([]interface{})
+			if err != nil {
-			if !ok || len(pair) != 2 {
+				return nil, err
-				return nil, fmt.Errorf("got %v, expected []interface{host, port}", viface)
+			}
+			if n != 2 {
+				return nil, fmt.Errorf("got %d elements in cluster info address, expected 2", n)
 			}
 
-			ip, ok := pair[0].(string)
+			ip, err := readStringReply(cn)
-			if !ok || len(ip) < 1 {
+			if err != nil {
-				return nil, fmt.Errorf("got %v, expected IP PORT pair", pair)
+				return nil, err
-			}
-			port, ok := pair[1].(int64)
-			if !ok || port < 1 {
-				return nil, fmt.Errorf("got %v, expected IP PORT pair", pair)
 			}
 
-			info.Addrs[n] = net.JoinHostPort(ip, strconv.FormatInt(port, 10))
+			port, err := readIntReply(cn)
+			if err != nil {
+				return nil, err
 			}
+
+			info.Addrs[i] = net.JoinHostPort(ip, strconv.FormatInt(port, 10))
+		}
+
 		infos = append(infos, info)
 	}
 	return infos, nil
 }
+
+func geoLocationParser(cn *conn, n int64) (interface{}, error) {
+	loc := &GeoLocation{}
+
+	var err error
+	loc.Name, err = readStringReply(cn)
+	if err != nil {
+		return nil, err
+	}
+	if n >= 2 {
+		loc.Distance, err = readFloatReply(cn)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if n >= 3 {
+		loc.GeoHash, err = readIntReply(cn)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if n >= 4 {
+		n, err := readArrayHeader(cn)
+		if err != nil {
+			return nil, err
+		}
+		if n != 2 {
+			return nil, fmt.Errorf("got %d coordinates, expected 2", n)
+		}
+
+		loc.Longitude, err = readFloatReply(cn)
+		if err != nil {
+			return nil, err
+		}
+		loc.Latitude, err = readFloatReply(cn)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return loc, nil
+}
+
+func geoLocationSliceParser(cn *conn, n int64) (interface{}, error) {
+	locs := make([]GeoLocation, 0, n)
+	for i := int64(0); i < n; i++ {
+		v, err := readReply(cn, geoLocationParser)
+		if err != nil {
+			return nil, err
+		}
+		switch vv := v.(type) {
+		case []byte:
+			locs = append(locs, GeoLocation{
+				Name: string(vv),
+			})
+		case *GeoLocation:
+			locs = append(locs, *vv)
+		default:
+			return nil, fmt.Errorf("got %T, expected string or *GeoLocation", v)
+		}
+	}
+	return locs, nil
+}

parser_test.go

@@ -23,7 +23,7 @@ func BenchmarkParseReplyString(b *testing.B) {
 }
 
 func BenchmarkParseReplySlice(b *testing.B) {
-	benchmarkParseReply(b, "*2\r\n$5\r\nhello\r\n$5\r\nworld\r\n", parseSlice, false)
+	benchmarkParseReply(b, "*2\r\n$5\r\nhello\r\n$5\r\nworld\r\n", sliceParser, false)
 }
 
 func benchmarkParseReply(b *testing.B, reply string, p multiBulkParser, wanterr bool) {
@@ -39,7 +39,7 @@ func benchmarkParseReply(b *testing.B, reply string, p multiBulkParser, wanterr
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
-		_, err := parseReply(cn, p)
+		_, err := readReply(cn, p)
 		if !wanterr && err != nil {
 			b.Fatal(err)
 		}

pipeline.go

@@ -97,7 +97,7 @@ func execCmds(cn *conn, cmds []Cmder) ([]Cmder, error) {
 	var firstCmdErr error
 	var failedCmds []Cmder
 	for _, cmd := range cmds {
-		err := cmd.parseReply(cn)
+		err := cmd.readReply(cn)
 		if err == nil {
 			continue
 		}

pubsub.go

@@ -215,7 +215,7 @@ func (c *PubSub) ReceiveTimeout(timeout time.Duration) (interface{}, error) {
 	cn.ReadTimeout = timeout
 
 	cmd := NewSliceCmd()
-	if err := cmd.parseReply(cn); err != nil {
+	if err := cmd.readReply(cn); err != nil {
 		return nil, err
 	}
 	return newMessage(cmd.Val())

redis.go

@@ -69,7 +69,7 @@ func (c *baseClient) process(cmd Cmder) {
 			return
 		}
 
-		err = cmd.parseReply(cn)
+		err = cmd.readReply(cn)
 		c.putConn(cn, err)
 		if shouldRetry(err) {
 			continue