// Cmd automatically gets one client from the pool, executes the given command
// (returning its result), and puts the client back in the pool
func (p *Pool) Cmd(cmd string, args ...interface{}) *redis.Resp {
c, err := p.Get()
if err != nil {
return redis.NewResp(err)
}
defer p.Put(c)
return c.Cmd(cmd, args...)
}
// LuaEval calls EVAL on the given Cmder for the given script, passing the key
// count and argument list in as well. See http://redis.io/commands/eval for
// more on how EVAL works and for the meaning of the keys argument.
//
// LuaEval will automatically try to call EVALSHA first in order to preserve
// bandwidth, and only falls back on EVAL if the script has never been used
// before.
//
// This method works with any of the Cmder's implemented in radix.v2, including
// Client, Pool, and Cluster.
//
// r := util.LuaEval(c, `return redis.call('GET', KEYS[1])`, 1, "foo")
//
func LuaEval(c Cmder, script string, keys int, args ...interface{}) *redis.Resp {
mainKey, _ := redis.KeyFromArgs(args...)
sumRaw := sha1.Sum([]byte(script))
sum := hex.EncodeToString(sumRaw[:])
var r *redis.Resp
if err := withClientForKey(c, mainKey, func(cc Cmder) {
r = c.Cmd("EVALSHA", sum, keys, args)
if r.Err != nil && strings.HasPrefix(r.Err.Error(), "NOSCRIPT") {
r = c.Cmd("EVAL", script, keys, args)
}
}); err != nil {
return redis.NewResp(err)
}
return r
}
func errorResp(err error) *redis.Resp {
return redis.NewResp(err)
}