fix(txpipeline): keyless commands should take the slot of the keyed (redis#3411)

* fix(txpipeline): keyless commands should take the slot of the keyed commands

* fix(txpipeline): extract only keyed cmds from all cmds

* chore(test): Add tests for keyless cmds and txpipeline

* fix(cmdSlot): Add preferred random slot

* fix(cmdSlot): Add shortlist of keyless cmds

* chore(test): Fix ring test

* fix(keylessCommands): Add list of keyless commands

Add list of keyless Commands based on the Commands output
for redis 8

* chore(txPipeline): refactor slottedCommands impl

* fix(osscluster): typo

Author: ndyakov

command.go

@@ -141,6 +141,55 @@ const (
 	CmdTypeTSTimestampValueSlice   = routing.CmdTypeTSTimestampValueSlice
 )
 
+// keylessCommands contains Redis commands that have empty key specifications (9th slot empty)
+// Only includes core Redis commands, excludes FT.*, ts.*, timeseries.*, search.* and subcommands
+var keylessCommands = map[string]struct{}{
+	"acl":          {},
+	"asking":       {},
+	"auth":         {},
+	"bgrewriteaof": {},
+	"bgsave":       {},
+	"client":       {},
+	"cluster":      {},
+	"config":       {},
+	"debug":        {},
+	"discard":      {},
+	"echo":         {},
+	"exec":         {},
+	"failover":     {},
+	"function":     {},
+	"hello":        {},
+	"latency":      {},
+	"lolwut":       {},
+	"module":       {},
+	"monitor":      {},
+	"multi":        {},
+	"pfselftest":   {},
+	"ping":         {},
+	"psubscribe":   {},
+	"psync":        {},
+	"publish":      {},
+	"pubsub":       {},
+	"punsubscribe": {},
+	"quit":         {},
+	"readonly":     {},
+	"readwrite":    {},
+	"replconf":     {},
+	"replicaof":    {},
+	"role":         {},
+	"save":         {},
+	"script":       {},
+	"select":       {},
+	"shutdown":     {},
+	"slaveof":      {},
+	"slowlog":      {},
+	"subscribe":    {},
+	"swapdb":       {},
+	"sync":         {},
+	"unsubscribe":  {},
+	"unwatch":      {},
+}
+
 type Cmder interface {
 	// command name.
 	// e.g. "set k v ex 10" -> "set", "cluster info" -> "cluster".