mirror of
https://github.com/astaxie/beego.git
synced 2024-11-05 10:40:56 +00:00
92 lines
3.0 KiB
Go
92 lines
3.0 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 (
|
|
"crypto/sha1"
|
|
"encoding/hex"
|
|
"io"
|
|
"strings"
|
|
)
|
|
|
|
// Script encapsulates the source, hash and key count for a Lua script. See
|
|
// http://redis.io/commands/eval for information on scripts in Redis.
|
|
type Script struct {
|
|
keyCount int
|
|
src string
|
|
hash string
|
|
}
|
|
|
|
// NewScript returns a new script object. If keyCount is greater than or equal
|
|
// to zero, then the count is automatically inserted in the EVAL command
|
|
// argument list. If keyCount is less than zero, then the application supplies
|
|
// the count as the first value in the keysAndArgs argument to the Do, Send and
|
|
// SendHash methods.
|
|
func NewScript(keyCount int, src string) *Script {
|
|
h := sha1.New()
|
|
io.WriteString(h, src)
|
|
return &Script{keyCount, src, hex.EncodeToString(h.Sum(nil))}
|
|
}
|
|
|
|
func (s *Script) args(spec string, keysAndArgs []interface{}) []interface{} {
|
|
var args []interface{}
|
|
if s.keyCount < 0 {
|
|
args = make([]interface{}, 1+len(keysAndArgs))
|
|
args[0] = spec
|
|
copy(args[1:], keysAndArgs)
|
|
} else {
|
|
args = make([]interface{}, 2+len(keysAndArgs))
|
|
args[0] = spec
|
|
args[1] = s.keyCount
|
|
copy(args[2:], keysAndArgs)
|
|
}
|
|
return args
|
|
}
|
|
|
|
// Hash returns the script hash.
|
|
func (s *Script) Hash() string {
|
|
return s.hash
|
|
}
|
|
|
|
// Do evaluates the script. Under the covers, Do optimistically evaluates the
|
|
// script using the EVALSHA command. If the command fails because the script is
|
|
// not loaded, then Do evaluates the script using the EVAL command (thus
|
|
// causing the script to load).
|
|
func (s *Script) Do(c Conn, keysAndArgs ...interface{}) (interface{}, error) {
|
|
v, err := c.Do("EVALSHA", s.args(s.hash, keysAndArgs)...)
|
|
if e, ok := err.(Error); ok && strings.HasPrefix(string(e), "NOSCRIPT ") {
|
|
v, err = c.Do("EVAL", s.args(s.src, keysAndArgs)...)
|
|
}
|
|
return v, err
|
|
}
|
|
|
|
// SendHash evaluates the script without waiting for the reply. The script is
|
|
// evaluated with the EVALSHA command. The application must ensure that the
|
|
// script is loaded by a previous call to Send, Do or Load methods.
|
|
func (s *Script) SendHash(c Conn, keysAndArgs ...interface{}) error {
|
|
return c.Send("EVALSHA", s.args(s.hash, keysAndArgs)...)
|
|
}
|
|
|
|
// Send evaluates the script without waiting for the reply.
|
|
func (s *Script) Send(c Conn, keysAndArgs ...interface{}) error {
|
|
return c.Send("EVAL", s.args(s.src, keysAndArgs)...)
|
|
}
|
|
|
|
// Load loads the script without evaluating it.
|
|
func (s *Script) Load(c Conn) error {
|
|
_, err := c.Do("SCRIPT", "LOAD", s.src)
|
|
return err
|
|
}
|