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cmd_script.go
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cmd_script.go
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package server
import (
"crypto/sha1"
"encoding/hex"
"errors"
"fmt"
"github.com/siddontang/go/hack"
"strconv"
"strings"
"github.com/yuin/gopher-lua"
)
func parseEvalArgs(l *lua.LState, c *client) error {
args := c.args
if len(args) < 2 {
return ErrCmdParams
}
args = args[1:]
n, err := strconv.Atoi(hack.String(args[0]))
if err != nil {
return err
}
if n > len(args)-1 {
return ErrCmdParams
}
luaSetGlobalArray(l, "KEYS", args[1:n+1])
luaSetGlobalArray(l, "ARGV", args[n+1:])
return nil
}
func evalGenericCommand(c *client, evalSha1 bool) (err error) {
s := c.app.script
luaClient := s.c
l := s.l
s.Lock()
defer func() {
luaClient.db = nil
// luaClient.script = nil
s.Unlock()
}()
luaClient.db = c.db
// luaClient.script = m
luaClient.remoteAddr = c.remoteAddr
if err := parseEvalArgs(l, c); err != nil {
return err
}
var key string
if !evalSha1 {
h := sha1.Sum(c.args[0])
key = hex.EncodeToString(h[0:20])
} else {
key = strings.ToLower(hack.String(c.args[0]))
}
global := l.GetGlobal(key)
if global.Type() == lua.LTNil {
if evalSha1 {
return errors.New("NOSCRIPT no matching script, please use EVAL")
}
val, err := l.LoadString(hack.String(c.args[0]))
if err != nil {
return err
}
l.SetGlobal(key, val)
s.chunks[key] = struct{}{}
global = val
}
l.Push(global)
// catch any uncaught panic
// this happens for example when the user,
// makes a mistake using `ledis.call`
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("panic: %v", r)
}
}()
l.Call(0, lua.MultRet)
r := luaReplyToLedisReply(l)
if v, ok := r.(error); ok {
return v
}
writeValue(c.resp, r)
return nil
}
func evalCommand(c *client) error {
return evalGenericCommand(c, false)
}
func evalshaCommand(c *client) error {
return evalGenericCommand(c, true)
}
func scriptCommand(c *client) error {
s := c.app.script
l := s.l
s.Lock()
base := l.GetTop()
defer func() {
l.SetTop(base)
s.Unlock()
}()
args := c.args
if len(args) < 1 {
return ErrCmdParams
}
switch strings.ToLower(hack.String(args[0])) {
case "load":
return scriptLoadCommand(c)
case "exists":
return scriptExistsCommand(c)
case "flush":
return scriptFlushCommand(c)
default:
return fmt.Errorf("invalid script %s", args[0])
}
}
func scriptLoadCommand(c *client) error {
s := c.app.script
l := s.l
if len(c.args) != 2 {
return ErrCmdParams
}
h := sha1.Sum(c.args[1])
key := hex.EncodeToString(h[0:20])
val, err := l.LoadString(hack.String(c.args[1]))
if err != nil {
return err
}
l.Push(val)
l.SetGlobal(key, val)
s.chunks[key] = struct{}{}
c.resp.writeBulk(hack.Slice(key))
return nil
}
func scriptExistsCommand(c *client) error {
s := c.app.script
if len(c.args) < 2 {
return ErrCmdParams
}
ay := make([]interface{}, len(c.args[1:]))
for i, n := range c.args[1:] {
if _, ok := s.chunks[hack.String(n)]; ok {
ay[i] = int64(1)
} else {
ay[i] = int64(0)
}
}
c.resp.writeArray(ay)
return nil
}
func scriptFlushCommand(c *client) error {
s := c.app.script
l := s.l
if len(c.args) != 1 {
return ErrCmdParams
}
for n := range s.chunks {
l.SetGlobal(n, lua.LNil)
}
s.chunks = map[string]struct{}{}
c.resp.writeStatus(OK)
return nil
}
func init() {
register("eval", evalCommand)
register("evalsha", evalshaCommand)
register("script", scriptCommand)
}