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package redis
import (
"context"
"crypto/sha1"
"encoding/hex"
"io"
"strings"
)
type Scripter interface {
Eval(ctx context.Context, script string, keys []string, args ...interface{}) *Cmd
EvalSha(ctx context.Context, sha1 string, keys []string, args ...interface{}) *Cmd
ScriptExists(ctx context.Context, hashes ...string) *BoolSliceCmd
ScriptLoad(ctx context.Context, script string) *StringCmd
}
var (
_ Scripter = (*Client)(nil)
_ Scripter = (*Ring)(nil)
_ Scripter = (*ClusterClient)(nil)
)
type Script struct {
src, hash string
}
func NewScript(src string) *Script {
h := sha1.New()
_, _ = io.WriteString(h, src)
return &Script{
src: src,
hash: hex.EncodeToString(h.Sum(nil)),
}
}
func (s *Script) Hash() string {
return s.hash
}
func (s *Script) Load(ctx context.Context, c Scripter) *StringCmd {
return c.ScriptLoad(ctx, s.src)
}
func (s *Script) Exists(ctx context.Context, c Scripter) *BoolSliceCmd {
return c.ScriptExists(ctx, s.hash)
}
func (s *Script) Eval(ctx context.Context, c Scripter, keys []string, args ...interface{}) *Cmd {
return c.Eval(ctx, s.src, keys, args...)
}
func (s *Script) EvalSha(ctx context.Context, c Scripter, keys []string, args ...interface{}) *Cmd {
return c.EvalSha(ctx, s.hash, keys, args...)
}
// Run optimistically uses EVALSHA to run the script. If script does not exist
// it is retried using EVAL.
func (s *Script) Run(ctx context.Context, c Scripter, keys []string, args ...interface{}) *Cmd {
r := s.EvalSha(ctx, c, keys, args...)
if err := r.Err(); err != nil && strings.HasPrefix(err.Error(), "NOSCRIPT ") {
return s.Eval(ctx, c, keys, args...)
}
return r
}
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