vendor/github.com/garyburd/redigo/redis/reply.go - gddo - Git at Google

 // Copyright 2012 Gary Burd
 //
 // Licensed under the Apache License, Version 2.0 (the "License"): you may
 // not use this file except in compliance with the License. You may obtain
 // a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 // License for the specific language governing permissions and limitations
 // under the License.

 package redis

 import (
 	"errors"
 	"fmt"
 	"strconv"
 )

 // ErrNil indicates that a reply value is nil.
 var ErrNil = errors.New("redigo: nil returned")

 // Int is a helper that converts a command reply to an integer. If err is not
 // equal to nil, then Int returns 0, err. Otherwise, Int converts the
 // reply to an int as follows:
 //
 //  Reply type    Result
 //  integer       int(reply), nil
 //  bulk string   parsed reply, nil
 //  nil           0, ErrNil
 //  other         0, error
 func Int(reply interface{}, err error) (int, error) {
 	if err != nil {
 		return 0, err
 	}
 	switch reply := reply.(type) {
 	case int64:
 		x := int(reply)
 		if int64(x) != reply {
 			return 0, strconv.ErrRange
 		}
 		return x, nil
 	case []byte:
 		n, err := strconv.ParseInt(string(reply), 10, 0)
 		return int(n), err
 	case nil:
 		return 0, ErrNil
 	case Error:
 		return 0, reply
 	}
 	return 0, fmt.Errorf("redigo: unexpected type for Int, got type %T", reply)
 }

 // Int64 is a helper that converts a command reply to 64 bit integer. If err is
 // not equal to nil, then Int returns 0, err. Otherwise, Int64 converts the
 // reply to an int64 as follows:
 //
 //  Reply type    Result
 //  integer       reply, nil
 //  bulk string   parsed reply, nil
 //  nil           0, ErrNil
 //  other         0, error
 func Int64(reply interface{}, err error) (int64, error) {
 	if err != nil {
 		return 0, err
 	}
 	switch reply := reply.(type) {
 	case int64:
 		return reply, nil
 	case []byte:
 		n, err := strconv.ParseInt(string(reply), 10, 64)
 		return n, err
 	case nil:
 		return 0, ErrNil
 	case Error:
 		return 0, reply
 	}
 	return 0, fmt.Errorf("redigo: unexpected type for Int64, got type %T", reply)
 }

 var errNegativeInt = errors.New("redigo: unexpected value for Uint64")

 // Uint64 is a helper that converts a command reply to 64 bit integer. If err is
 // not equal to nil, then Int returns 0, err. Otherwise, Int64 converts the
 // reply to an int64 as follows:
 //
 //  Reply type    Result
 //  integer       reply, nil
 //  bulk string   parsed reply, nil
 //  nil           0, ErrNil
 //  other         0, error
 func Uint64(reply interface{}, err error) (uint64, error) {
 	if err != nil {
 		return 0, err
 	}
 	switch reply := reply.(type) {
 	case int64:
 		if reply < 0 {
 			return 0, errNegativeInt
 		}
 		return uint64(reply), nil
 	case []byte:
 		n, err := strconv.ParseUint(string(reply), 10, 64)
 		return n, err
 	case nil:
 		return 0, ErrNil
 	case Error:
 		return 0, reply
 	}
 	return 0, fmt.Errorf("redigo: unexpected type for Uint64, got type %T", reply)
 }

 // Float64 is a helper that converts a command reply to 64 bit float. If err is
 // not equal to nil, then Float64 returns 0, err. Otherwise, Float64 converts
 // the reply to an int as follows:
 //
 //  Reply type    Result
 //  bulk string   parsed reply, nil
 //  nil           0, ErrNil
 //  other         0, error
 func Float64(reply interface{}, err error) (float64, error) {
 	if err != nil {
 		return 0, err
 	}
 	switch reply := reply.(type) {
 	case []byte:
 		n, err := strconv.ParseFloat(string(reply), 64)
 		return n, err
 	case nil:
 		return 0, ErrNil
 	case Error:
 		return 0, reply
 	}
 	return 0, fmt.Errorf("redigo: unexpected type for Float64, got type %T", reply)
 }

 // String is a helper that converts a command reply to a string. If err is not
 // equal to nil, then String returns "", err. Otherwise String converts the
 // reply to a string as follows:
 //
 //  Reply type      Result
 //  bulk string     string(reply), nil
 //  simple string   reply, nil
 //  nil             "",  ErrNil
 //  other           "",  error
 func String(reply interface{}, err error) (string, error) {
 	if err != nil {
 		return "", err
 	}
 	switch reply := reply.(type) {
 	case []byte:
 		return string(reply), nil
 	case string:
 		return reply, nil
 	case nil:
 		return "", ErrNil
 	case Error:
 		return "", reply
 	}
 	return "", fmt.Errorf("redigo: unexpected type for String, got type %T", reply)
 }

 // Bytes is a helper that converts a command reply to a slice of bytes. If err
 // is not equal to nil, then Bytes returns nil, err. Otherwise Bytes converts
 // the reply to a slice of bytes as follows:
 //
 //  Reply type      Result
 //  bulk string     reply, nil
 //  simple string   []byte(reply), nil
 //  nil             nil, ErrNil
 //  other           nil, error
 func Bytes(reply interface{}, err error) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
 	switch reply := reply.(type) {
 	case []byte:
 		return reply, nil
 	case string:
 		return []byte(reply), nil
 	case nil:
 		return nil, ErrNil
 	case Error:
 		return nil, reply
 	}
 	return nil, fmt.Errorf("redigo: unexpected type for Bytes, got type %T", reply)
 }

 // Bool is a helper that converts a command reply to a boolean. If err is not
 // equal to nil, then Bool returns false, err. Otherwise Bool converts the
 // reply to boolean as follows:
 //
 //  Reply type      Result
 //  integer         value != 0, nil
 //  bulk string     strconv.ParseBool(reply)
 //  nil             false, ErrNil
 //  other           false, error
 func Bool(reply interface{}, err error) (bool, error) {
 	if err != nil {
 		return false, err
 	}
 	switch reply := reply.(type) {
 	case int64:
 		return reply != 0, nil
 	case []byte:
 		return strconv.ParseBool(string(reply))
 	case nil:
 		return false, ErrNil
 	case Error:
 		return false, reply
 	}
 	return false, fmt.Errorf("redigo: unexpected type for Bool, got type %T", reply)
 }

 // MultiBulk is a helper that converts an array command reply to a []interface{}.
 //
 // Deprecated: Use Values instead.
 func MultiBulk(reply interface{}, err error) ([]interface{}, error) { return Values(reply, err) }

 // Values is a helper that converts an array command reply to a []interface{}.
 // If err is not equal to nil, then Values returns nil, err. Otherwise, Values
 // converts the reply as follows:
 //
 //  Reply type      Result
 //  array           reply, nil
 //  nil             nil, ErrNil
 //  other           nil, error
 func Values(reply interface{}, err error) ([]interface{}, error) {
 	if err != nil {
 		return nil, err
 	}
 	switch reply := reply.(type) {
 	case []interface{}:
 		return reply, nil
 	case nil:
 		return nil, ErrNil
 	case Error:
 		return nil, reply
 	}
 	return nil, fmt.Errorf("redigo: unexpected type for Values, got type %T", reply)
 }

 // Strings is a helper that converts an array command reply to a []string. If
 // err is not equal to nil, then Strings returns nil, err. Nil array items are
 // converted to "" in the output slice. Strings returns an error if an array
 // item is not a bulk string or nil.
 func Strings(reply interface{}, err error) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
 	switch reply := reply.(type) {
 	case []interface{}:
 		result := make([]string, len(reply))
 		for i := range reply {
 			if reply[i] == nil {
 				continue
 			}
 			p, ok := reply[i].([]byte)
 			if !ok {
 				return nil, fmt.Errorf("redigo: unexpected element type for Strings, got type %T", reply[i])
 			}
 			result[i] = string(p)
 		}
 		return result, nil
 	case nil:
 		return nil, ErrNil
 	case Error:
 		return nil, reply
 	}
 	return nil, fmt.Errorf("redigo: unexpected type for Strings, got type %T", reply)
 }

 // ByteSlices is a helper that converts an array command reply to a [][]byte.
 // If err is not equal to nil, then ByteSlices returns nil, err. Nil array
 // items are stay nil. ByteSlices returns an error if an array item is not a
 // bulk string or nil.
 func ByteSlices(reply interface{}, err error) ([][]byte, error) {
 	if err != nil {
 		return nil, err
 	}
 	switch reply := reply.(type) {
 	case []interface{}:
 		result := make([][]byte, len(reply))
 		for i := range reply {
 			if reply[i] == nil {
 				continue
 			}
 			p, ok := reply[i].([]byte)
 			if !ok {
 				return nil, fmt.Errorf("redigo: unexpected element type for ByteSlices, got type %T", reply[i])
 			}
 			result[i] = p
 		}
 		return result, nil
 	case nil:
 		return nil, ErrNil
 	case Error:
 		return nil, reply
 	}
 	return nil, fmt.Errorf("redigo: unexpected type for ByteSlices, got type %T", reply)
 }

 // Ints is a helper that converts an array command reply to a []int. If
 // err is not equal to nil, then Ints returns nil, err.
 func Ints(reply interface{}, err error) ([]int, error) {
 	var ints []int
 	values, err := Values(reply, err)
 	if err != nil {
 		return ints, err
 	}
 	if err := ScanSlice(values, &ints); err != nil {
 		return ints, err
 	}
 	return ints, nil
 }

 // StringMap is a helper that converts an array of strings (alternating key, value)
 // into a map[string]string. The HGETALL and CONFIG GET commands return replies in this format.
 // Requires an even number of values in result.
 func StringMap(result interface{}, err error) (map[string]string, error) {
 	values, err := Values(result, err)
 	if err != nil {
 		return nil, err
 	}
 	if len(values)%2 != 0 {
 		return nil, errors.New("redigo: StringMap expects even number of values result")
 	}
 	m := make(map[string]string, len(values)/2)
 	for i := 0; i < len(values); i += 2 {
 		key, okKey := values[i].([]byte)
 		value, okValue := values[i+1].([]byte)
 		if !okKey || !okValue {
 			return nil, errors.New("redigo: StringMap key not a bulk string value")
 		}
 		m[string(key)] = string(value)
 	}
 	return m, nil
 }

 // IntMap is a helper that converts an array of strings (alternating key, value)
 // into a map[string]int. The HGETALL commands return replies in this format.
 // Requires an even number of values in result.
 func IntMap(result interface{}, err error) (map[string]int, error) {
 	values, err := Values(result, err)
 	if err != nil {
 		return nil, err
 	}
 	if len(values)%2 != 0 {
 		return nil, errors.New("redigo: IntMap expects even number of values result")
 	}
 	m := make(map[string]int, len(values)/2)
 	for i := 0; i < len(values); i += 2 {
 		key, ok := values[i].([]byte)
 		if !ok {
 			return nil, errors.New("redigo: IntMap key not a bulk string value")
 		}
 		value, err := Int(values[i+1], nil)
 		if err != nil {
 			return nil, err
 		}
 		m[string(key)] = value
 	}
 	return m, nil
 }

 // Int64Map is a helper that converts an array of strings (alternating key, value)
 // into a map[string]int64. The HGETALL commands return replies in this format.
 // Requires an even number of values in result.
 func Int64Map(result interface{}, err error) (map[string]int64, error) {
 	values, err := Values(result, err)
 	if err != nil {
 		return nil, err
 	}
 	if len(values)%2 != 0 {
 		return nil, errors.New("redigo: Int64Map expects even number of values result")
 	}
 	m := make(map[string]int64, len(values)/2)
 	for i := 0; i < len(values); i += 2 {
 		key, ok := values[i].([]byte)
 		if !ok {
 			return nil, errors.New("redigo: Int64Map key not a bulk string value")
 		}
 		value, err := Int64(values[i+1], nil)
 		if err != nil {
 			return nil, err
 		}
 		m[string(key)] = value
 	}
 	return m, nil
 }

 // Positions is a helper that converts an array of positions (lat, long)
 // into a [][2]float64. The GEOPOS command returns replies in this format.
 func Positions(result interface{}, err error) ([]*[2]float64, error) {
 	values, err := Values(result, err)
 	if err != nil {
 		return nil, err
 	}
 	positions := make([]*[2]float64, len(values))
 	for i := range values {
 		if values[i] == nil {
 			continue
 		}
 		p, ok := values[i].([]interface{})
 		if !ok {
 			return nil, fmt.Errorf("redigo: unexpected element type for interface slice, got type %T", values[i])
 		}
 		if len(p) != 2 {
 			return nil, fmt.Errorf("redigo: unexpected number of values for a member position, got %d", len(p))
 		}
 		lat, err := Float64(p[0], nil)
 		if err != nil {
 			return nil, err
 		}
 		long, err := Float64(p[1], nil)
 		if err != nil {
 			return nil, err
 		}
 		positions[i] = &[2]float64{lat, long}
 	}
 	return positions, nil
 }
	// Copyright 2012 Gary Burd
	//
	// Licensed under the Apache License, Version 2.0 (the "License"): you may
	// not use this file except in compliance with the License. You may obtain
	// a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	// License for the specific language governing permissions and limitations
	// under the License.

	package redis

	import (
	"errors"
	"fmt"
	"strconv"
	)

	// ErrNil indicates that a reply value is nil.
	var ErrNil = errors.New("redigo: nil returned")

	// Int is a helper that converts a command reply to an integer. If err is not
	// equal to nil, then Int returns 0, err. Otherwise, Int converts the
	// reply to an int as follows:
	//
	// Reply type Result
	// integer int(reply), nil
	// bulk string parsed reply, nil
	// nil 0, ErrNil
	// other 0, error
	func Int(reply interface{}, err error) (int, error) {
	if err != nil {
	return 0, err
	}
	switch reply := reply.(type) {
	case int64:
	x := int(reply)
	if int64(x) != reply {
	return 0, strconv.ErrRange
	}
	return x, nil
	case []byte:
	n, err := strconv.ParseInt(string(reply), 10, 0)
	return int(n), err
	case nil:
	return 0, ErrNil
	case Error:
	return 0, reply
	}
	return 0, fmt.Errorf("redigo: unexpected type for Int, got type %T", reply)
	}

	// Int64 is a helper that converts a command reply to 64 bit integer. If err is
	// not equal to nil, then Int returns 0, err. Otherwise, Int64 converts the
	// reply to an int64 as follows:
	//
	// Reply type Result
	// integer reply, nil
	// bulk string parsed reply, nil
	// nil 0, ErrNil
	// other 0, error
	func Int64(reply interface{}, err error) (int64, error) {
	if err != nil {
	return 0, err
	}
	switch reply := reply.(type) {
	case int64:
	return reply, nil
	case []byte:
	n, err := strconv.ParseInt(string(reply), 10, 64)
	return n, err
	case nil:
	return 0, ErrNil
	case Error:
	return 0, reply
	}
	return 0, fmt.Errorf("redigo: unexpected type for Int64, got type %T", reply)
	}

	var errNegativeInt = errors.New("redigo: unexpected value for Uint64")

	// Uint64 is a helper that converts a command reply to 64 bit integer. If err is
	// not equal to nil, then Int returns 0, err. Otherwise, Int64 converts the
	// reply to an int64 as follows:
	//
	// Reply type Result
	// integer reply, nil
	// bulk string parsed reply, nil
	// nil 0, ErrNil
	// other 0, error
	func Uint64(reply interface{}, err error) (uint64, error) {
	if err != nil {
	return 0, err
	}
	switch reply := reply.(type) {
	case int64:
	if reply < 0 {
	return 0, errNegativeInt
	}
	return uint64(reply), nil
	case []byte:
	n, err := strconv.ParseUint(string(reply), 10, 64)
	return n, err
	case nil:
	return 0, ErrNil
	case Error:
	return 0, reply
	}
	return 0, fmt.Errorf("redigo: unexpected type for Uint64, got type %T", reply)
	}

	// Float64 is a helper that converts a command reply to 64 bit float. If err is
	// not equal to nil, then Float64 returns 0, err. Otherwise, Float64 converts
	// the reply to an int as follows:
	//
	// Reply type Result
	// bulk string parsed reply, nil
	// nil 0, ErrNil
	// other 0, error
	func Float64(reply interface{}, err error) (float64, error) {
	if err != nil {
	return 0, err
	}
	switch reply := reply.(type) {
	case []byte:
	n, err := strconv.ParseFloat(string(reply), 64)
	return n, err
	case nil:
	return 0, ErrNil
	case Error:
	return 0, reply
	}
	return 0, fmt.Errorf("redigo: unexpected type for Float64, got type %T", reply)
	}

	// String is a helper that converts a command reply to a string. If err is not
	// equal to nil, then String returns "", err. Otherwise String converts the
	// reply to a string as follows:
	//
	// Reply type Result
	// bulk string string(reply), nil
	// simple string reply, nil
	// nil "", ErrNil
	// other "", error
	func String(reply interface{}, err error) (string, error) {
	if err != nil {
	return "", err
	}
	switch reply := reply.(type) {
	case []byte:
	return string(reply), nil
	case string:
	return reply, nil
	case nil:
	return "", ErrNil
	case Error:
	return "", reply
	}
	return "", fmt.Errorf("redigo: unexpected type for String, got type %T", reply)
	}

	// Bytes is a helper that converts a command reply to a slice of bytes. If err
	// is not equal to nil, then Bytes returns nil, err. Otherwise Bytes converts
	// the reply to a slice of bytes as follows:
	//
	// Reply type Result
	// bulk string reply, nil
	// simple string []byte(reply), nil
	// nil nil, ErrNil
	// other nil, error
	func Bytes(reply interface{}, err error) ([]byte, error) {
	if err != nil {
	return nil, err
	}
	switch reply := reply.(type) {
	case []byte:
	return reply, nil
	case string:
	return []byte(reply), nil
	case nil:
	return nil, ErrNil
	case Error:
	return nil, reply
	}
	return nil, fmt.Errorf("redigo: unexpected type for Bytes, got type %T", reply)
	}

	// Bool is a helper that converts a command reply to a boolean. If err is not
	// equal to nil, then Bool returns false, err. Otherwise Bool converts the
	// reply to boolean as follows:
	//
	// Reply type Result
	// integer value != 0, nil
	// bulk string strconv.ParseBool(reply)
	// nil false, ErrNil
	// other false, error
	func Bool(reply interface{}, err error) (bool, error) {
	if err != nil {
	return false, err
	}
	switch reply := reply.(type) {
	case int64:
	return reply != 0, nil
	case []byte:
	return strconv.ParseBool(string(reply))
	case nil:
	return false, ErrNil
	case Error:
	return false, reply
	}
	return false, fmt.Errorf("redigo: unexpected type for Bool, got type %T", reply)
	}

	// MultiBulk is a helper that converts an array command reply to a []interface{}.
	//
	// Deprecated: Use Values instead.
	func MultiBulk(reply interface{}, err error) ([]interface{}, error) { return Values(reply, err) }

	// Values is a helper that converts an array command reply to a []interface{}.
	// If err is not equal to nil, then Values returns nil, err. Otherwise, Values
	// converts the reply as follows:
	//
	// Reply type Result
	// array reply, nil
	// nil nil, ErrNil
	// other nil, error
	func Values(reply interface{}, err error) ([]interface{}, error) {
	if err != nil {
	return nil, err
	}
	switch reply := reply.(type) {
	case []interface{}:
	return reply, nil
	case nil:
	return nil, ErrNil
	case Error:
	return nil, reply
	}
	return nil, fmt.Errorf("redigo: unexpected type for Values, got type %T", reply)
	}

	// Strings is a helper that converts an array command reply to a []string. If
	// err is not equal to nil, then Strings returns nil, err. Nil array items are
	// converted to "" in the output slice. Strings returns an error if an array
	// item is not a bulk string or nil.
	func Strings(reply interface{}, err error) ([]string, error) {
	if err != nil {
	return nil, err
	}
	switch reply := reply.(type) {
	case []interface{}:
	result := make([]string, len(reply))
	for i := range reply {
	if reply[i] == nil {
	continue
	}
	p, ok := reply[i].([]byte)
	if !ok {
	return nil, fmt.Errorf("redigo: unexpected element type for Strings, got type %T", reply[i])
	}
	result[i] = string(p)
	}
	return result, nil
	case nil:
	return nil, ErrNil
	case Error:
	return nil, reply
	}
	return nil, fmt.Errorf("redigo: unexpected type for Strings, got type %T", reply)
	}

	// ByteSlices is a helper that converts an array command reply to a [][]byte.
	// If err is not equal to nil, then ByteSlices returns nil, err. Nil array
	// items are stay nil. ByteSlices returns an error if an array item is not a
	// bulk string or nil.
	func ByteSlices(reply interface{}, err error) ([][]byte, error) {
	if err != nil {
	return nil, err
	}
	switch reply := reply.(type) {
	case []interface{}:
	result := make([][]byte, len(reply))
	for i := range reply {
	if reply[i] == nil {
	continue
	}
	p, ok := reply[i].([]byte)
	if !ok {
	return nil, fmt.Errorf("redigo: unexpected element type for ByteSlices, got type %T", reply[i])
	}
	result[i] = p
	}
	return result, nil
	case nil:
	return nil, ErrNil
	case Error:
	return nil, reply
	}
	return nil, fmt.Errorf("redigo: unexpected type for ByteSlices, got type %T", reply)
	}

	// Ints is a helper that converts an array command reply to a []int. If
	// err is not equal to nil, then Ints returns nil, err.
	func Ints(reply interface{}, err error) ([]int, error) {
	var ints []int
	values, err := Values(reply, err)
	if err != nil {
	return ints, err
	}
	if err := ScanSlice(values, &ints); err != nil {
	return ints, err
	}
	return ints, nil
	}

	// StringMap is a helper that converts an array of strings (alternating key, value)
	// into a map[string]string. The HGETALL and CONFIG GET commands return replies in this format.
	// Requires an even number of values in result.
	func StringMap(result interface{}, err error) (map[string]string, error) {
	values, err := Values(result, err)
	if err != nil {
	return nil, err
	}
	if len(values)%2 != 0 {
	return nil, errors.New("redigo: StringMap expects even number of values result")
	}
	m := make(map[string]string, len(values)/2)
	for i := 0; i < len(values); i += 2 {
	key, okKey := values[i].([]byte)
	value, okValue := values[i+1].([]byte)
	if !okKey \|\| !okValue {
	return nil, errors.New("redigo: StringMap key not a bulk string value")
	}
	m[string(key)] = string(value)
	}
	return m, nil
	}

	// IntMap is a helper that converts an array of strings (alternating key, value)
	// into a map[string]int. The HGETALL commands return replies in this format.
	// Requires an even number of values in result.
	func IntMap(result interface{}, err error) (map[string]int, error) {
	values, err := Values(result, err)
	if err != nil {
	return nil, err
	}
	if len(values)%2 != 0 {
	return nil, errors.New("redigo: IntMap expects even number of values result")
	}
	m := make(map[string]int, len(values)/2)
	for i := 0; i < len(values); i += 2 {
	key, ok := values[i].([]byte)
	if !ok {
	return nil, errors.New("redigo: IntMap key not a bulk string value")
	}
	value, err := Int(values[i+1], nil)
	if err != nil {
	return nil, err
	}
	m[string(key)] = value
	}
	return m, nil
	}

	// Int64Map is a helper that converts an array of strings (alternating key, value)
	// into a map[string]int64. The HGETALL commands return replies in this format.
	// Requires an even number of values in result.
	func Int64Map(result interface{}, err error) (map[string]int64, error) {
	values, err := Values(result, err)
	if err != nil {
	return nil, err
	}
	if len(values)%2 != 0 {
	return nil, errors.New("redigo: Int64Map expects even number of values result")
	}
	m := make(map[string]int64, len(values)/2)
	for i := 0; i < len(values); i += 2 {
	key, ok := values[i].([]byte)
	if !ok {
	return nil, errors.New("redigo: Int64Map key not a bulk string value")
	}
	value, err := Int64(values[i+1], nil)
	if err != nil {
	return nil, err
	}
	m[string(key)] = value
	}
	return m, nil
	}

	// Positions is a helper that converts an array of positions (lat, long)
	// into a [][2]float64. The GEOPOS command returns replies in this format.
	func Positions(result interface{}, err error) ([]*[2]float64, error) {
	values, err := Values(result, err)
	if err != nil {
	return nil, err
	}
	positions := make([]*[2]float64, len(values))
	for i := range values {
	if values[i] == nil {
	continue
	}
	p, ok := values[i].([]interface{})
	if !ok {
	return nil, fmt.Errorf("redigo: unexpected element type for interface slice, got type %T", values[i])
	}
	if len(p) != 2 {
	return nil, fmt.Errorf("redigo: unexpected number of values for a member position, got %d", len(p))
	}
	lat, err := Float64(p[0], nil)
	if err != nil {
	return nil, err
	}
	long, err := Float64(p[1], nil)
	if err != nil {
	return nil, err
	}
	positions[i] = &[2]float64{lat, long}
	}
	return positions, nil
	}