We forked the upstream to address a build issue on go 1.6 - that is long done and we don't need to manage our forks anymore.
393 lines
11 KiB
Go
393 lines
11 KiB
Go
// 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: ScanMap 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: ScanMap 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: ScanMap 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
|
|
}
|