312 lines
8.6 KiB
Go
312 lines
8.6 KiB
Go
// Copyright 2012 Gary Burd
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package redis
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import (
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"errors"
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"fmt"
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"strconv"
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)
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// ErrNil indicates that a reply value is nil.
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var ErrNil = errors.New("redigo: nil returned")
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// Int is a helper that converts a command reply to an integer. If err is not
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// equal to nil, then Int returns 0, err. Otherwise, Int converts the
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// reply to an int as follows:
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//
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// Reply type Result
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// integer int(reply), nil
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// bulk string parsed reply, nil
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// nil 0, ErrNil
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// other 0, error
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func Int(reply interface{}, err error) (int, error) {
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if err != nil {
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return 0, err
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}
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switch reply := reply.(type) {
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case int64:
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x := int(reply)
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if int64(x) != reply {
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return 0, strconv.ErrRange
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}
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return x, nil
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case []byte:
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n, err := strconv.ParseInt(string(reply), 10, 0)
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return int(n), err
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case nil:
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return 0, ErrNil
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case Error:
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return 0, reply
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}
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return 0, fmt.Errorf("redigo: unexpected type for Int, got type %T", reply)
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}
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// Int64 is a helper that converts a command reply to 64 bit integer. If err is
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// not equal to nil, then Int returns 0, err. Otherwise, Int64 converts the
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// reply to an int64 as follows:
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//
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// Reply type Result
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// integer reply, nil
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// bulk string parsed reply, nil
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// nil 0, ErrNil
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// other 0, error
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func Int64(reply interface{}, err error) (int64, error) {
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if err != nil {
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return 0, err
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}
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switch reply := reply.(type) {
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case int64:
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return reply, nil
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case []byte:
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n, err := strconv.ParseInt(string(reply), 10, 64)
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return n, err
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case nil:
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return 0, ErrNil
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case Error:
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return 0, reply
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}
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return 0, fmt.Errorf("redigo: unexpected type for Int64, got type %T", reply)
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}
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var errNegativeInt = errors.New("redigo: unexpected value for Uint64")
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// Uint64 is a helper that converts a command reply to 64 bit integer. If err is
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// not equal to nil, then Int returns 0, err. Otherwise, Int64 converts the
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// reply to an int64 as follows:
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//
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// Reply type Result
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// integer reply, nil
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// bulk string parsed reply, nil
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// nil 0, ErrNil
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// other 0, error
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func Uint64(reply interface{}, err error) (uint64, error) {
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if err != nil {
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return 0, err
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}
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switch reply := reply.(type) {
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case int64:
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if reply < 0 {
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return 0, errNegativeInt
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}
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return uint64(reply), nil
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case []byte:
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n, err := strconv.ParseUint(string(reply), 10, 64)
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return n, err
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case nil:
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return 0, ErrNil
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case Error:
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return 0, reply
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}
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return 0, fmt.Errorf("redigo: unexpected type for Uint64, got type %T", reply)
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}
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// Float64 is a helper that converts a command reply to 64 bit float. If err is
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// not equal to nil, then Float64 returns 0, err. Otherwise, Float64 converts
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// the reply to an int as follows:
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//
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// Reply type Result
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// bulk string parsed reply, nil
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// nil 0, ErrNil
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// other 0, error
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func Float64(reply interface{}, err error) (float64, error) {
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if err != nil {
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return 0, err
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}
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switch reply := reply.(type) {
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case []byte:
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n, err := strconv.ParseFloat(string(reply), 64)
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return n, err
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case nil:
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return 0, ErrNil
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case Error:
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return 0, reply
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}
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return 0, fmt.Errorf("redigo: unexpected type for Float64, got type %T", reply)
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}
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// String is a helper that converts a command reply to a string. If err is not
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// equal to nil, then String returns "", err. Otherwise String converts the
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// reply to a string as follows:
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//
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// Reply type Result
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// bulk string string(reply), nil
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// simple string reply, nil
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// nil "", ErrNil
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// other "", error
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func String(reply interface{}, err error) (string, error) {
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if err != nil {
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return "", err
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}
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switch reply := reply.(type) {
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case []byte:
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return string(reply), nil
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case string:
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return reply, nil
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case nil:
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return "", ErrNil
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case Error:
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return "", reply
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}
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return "", fmt.Errorf("redigo: unexpected type for String, got type %T", reply)
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}
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// Bytes is a helper that converts a command reply to a slice of bytes. If err
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// is not equal to nil, then Bytes returns nil, err. Otherwise Bytes converts
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// the reply to a slice of bytes as follows:
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//
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// Reply type Result
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// bulk string reply, nil
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// simple string []byte(reply), nil
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// nil nil, ErrNil
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// other nil, error
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func Bytes(reply interface{}, err error) ([]byte, error) {
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if err != nil {
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return nil, err
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}
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switch reply := reply.(type) {
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case []byte:
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return reply, nil
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case string:
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return []byte(reply), nil
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case nil:
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return nil, ErrNil
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case Error:
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return nil, reply
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}
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return nil, fmt.Errorf("redigo: unexpected type for Bytes, got type %T", reply)
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}
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// Bool is a helper that converts a command reply to a boolean. If err is not
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// equal to nil, then Bool returns false, err. Otherwise Bool converts the
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// reply to boolean as follows:
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//
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// Reply type Result
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// integer value != 0, nil
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// bulk string strconv.ParseBool(reply)
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// nil false, ErrNil
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// other false, error
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func Bool(reply interface{}, err error) (bool, error) {
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if err != nil {
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return false, err
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}
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switch reply := reply.(type) {
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case int64:
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return reply != 0, nil
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case []byte:
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return strconv.ParseBool(string(reply))
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case nil:
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return false, ErrNil
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case Error:
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return false, reply
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}
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return false, fmt.Errorf("redigo: unexpected type for Bool, got type %T", reply)
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}
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// MultiBulk is deprecated. Use Values.
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func MultiBulk(reply interface{}, err error) ([]interface{}, error) { return Values(reply, err) }
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// Values is a helper that converts an array command reply to a []interface{}.
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// If err is not equal to nil, then Values returns nil, err. Otherwise, Values
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// converts the reply as follows:
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//
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// Reply type Result
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// array reply, nil
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// nil nil, ErrNil
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// other nil, error
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func Values(reply interface{}, err error) ([]interface{}, error) {
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if err != nil {
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return nil, err
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}
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switch reply := reply.(type) {
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case []interface{}:
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return reply, nil
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case nil:
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return nil, ErrNil
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case Error:
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return nil, reply
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}
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return nil, fmt.Errorf("redigo: unexpected type for Values, got type %T", reply)
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}
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// Strings is a helper that converts an array command reply to a []string. If
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// err is not equal to nil, then Strings returns nil, err. Nil array items are
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// converted to "" in the output slice. Strings returns an error if an array
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// item is not a bulk string or nil.
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func Strings(reply interface{}, err error) ([]string, error) {
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if err != nil {
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return nil, err
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}
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switch reply := reply.(type) {
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case []interface{}:
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result := make([]string, len(reply))
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for i := range reply {
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if reply[i] == nil {
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continue
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}
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p, ok := reply[i].([]byte)
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if !ok {
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return nil, fmt.Errorf("redigo: unexpected element type for Strings, got type %T", reply[i])
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}
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result[i] = string(p)
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}
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return result, nil
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case nil:
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return nil, ErrNil
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case Error:
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return nil, reply
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}
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return nil, fmt.Errorf("redigo: unexpected type for Strings, got type %T", reply)
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}
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// Ints is a helper that converts an array command reply to a []int. If
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// err is not equal to nil, then Ints returns nil, err.
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func Ints(reply interface{}, err error) ([]int, error) {
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var ints []int
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if reply == nil {
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return ints, ErrNil
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}
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values, err := Values(reply, err)
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if err != nil {
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return ints, err
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}
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if err := ScanSlice(values, &ints); err != nil {
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return ints, err
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}
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return ints, nil
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}
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// StringMap is a helper that converts an array of strings (alternating key, value)
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// into a map[string]string. The HGETALL and CONFIG GET commands return replies in this format.
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// Requires an even number of values in result.
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func StringMap(result interface{}, err error) (map[string]string, error) {
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values, err := Values(result, err)
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if err != nil {
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return nil, err
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}
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if len(values)%2 != 0 {
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return nil, errors.New("redigo: StringMap expects even number of values result")
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}
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m := make(map[string]string, len(values)/2)
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for i := 0; i < len(values); i += 2 {
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key, okKey := values[i].([]byte)
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value, okValue := values[i+1].([]byte)
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if !okKey || !okValue {
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return nil, errors.New("redigo: ScanMap key not a bulk string value")
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}
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m[string(key)] = string(value)
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}
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return m, nil
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}
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