Replace redigo with redis-go

We are replacing the very outdated redigo Go module with the official
redis Go module, go-redis.

Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>

vendor/github.com/redis/go-redis/v9/script.go

@@ -0,0 +1,84 @@
+package redis
+
+import (
+	"context"
+	"crypto/sha1"
+	"encoding/hex"
+	"io"
+)
+
+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
+	EvalRO(ctx context.Context, script string, keys []string, args ...interface{}) *Cmd
+	EvalShaRO(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) EvalRO(ctx context.Context, c Scripter, keys []string, args ...interface{}) *Cmd {
+	return c.EvalRO(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...)
+}
+
+func (s *Script) EvalShaRO(ctx context.Context, c Scripter, keys []string, args ...interface{}) *Cmd {
+	return c.EvalShaRO(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 HasErrorPrefix(r.Err(), "NOSCRIPT") {
+		return s.Eval(ctx, c, keys, args...)
+	}
+	return r
+}
+
+// RunRO optimistically uses EVALSHA_RO to run the script. If script does not exist
+// it is retried using EVAL_RO.
+func (s *Script) RunRO(ctx context.Context, c Scripter, keys []string, args ...interface{}) *Cmd {
+	r := s.EvalShaRO(ctx, c, keys, args...)
+	if HasErrorPrefix(r.Err(), "NOSCRIPT") {
+		return s.EvalRO(ctx, c, keys, args...)
+	}
+	return r
+}