src: Add DMA localagent

[barometer.git] / src / dma / vendor / github.com / go-redis / redis / script.go

diff --git a/src/dma/vendor/github.com/go-redis/redis/script.go b/src/dma/vendor/github.com/go-redis/redis/script.go
new file mode 100644 (file)
index 0000000..09f36d9
--- /dev/null
+++ b/src/dma/vendor/github.com/go-redis/redis/script.go
@@ -0,0 +1,62 @@
+package redis
+
+import (
+       "crypto/sha1"
+       "encoding/hex"
+       "io"
+       "strings"
+)
+
+type scripter interface {
+       Eval(script string, keys []string, args ...interface{}) *Cmd
+       EvalSha(sha1 string, keys []string, args ...interface{}) *Cmd
+       ScriptExists(hashes ...string) *BoolSliceCmd
+       ScriptLoad(script string) *StringCmd
+}
+
+var _ scripter = (*Client)(nil)
+var _ scripter = (*Ring)(nil)
+var _ 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(c scripter) *StringCmd {
+       return c.ScriptLoad(s.src)
+}
+
+func (s *Script) Exists(c scripter) *BoolSliceCmd {
+       return c.ScriptExists(s.hash)
+}
+
+func (s *Script) Eval(c scripter, keys []string, args ...interface{}) *Cmd {
+       return c.Eval(s.src, keys, args...)
+}
+
+func (s *Script) EvalSha(c scripter, keys []string, args ...interface{}) *Cmd {
+       return c.EvalSha(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(c scripter, keys []string, args ...interface{}) *Cmd {
+       r := s.EvalSha(c, keys, args...)
+       if err := r.Err(); err != nil && strings.HasPrefix(err.Error(), "NOSCRIPT ") {
+               return s.Eval(c, keys, args...)
+       }
+       return r
+}