Issue indexer queue redis support (#6218)

* add redis queue

* finished indexer redis queue

* add redis vendor

* fix vet

* Update docs/content/doc/advanced/config-cheat-sheet.en-us.md

Co-Authored-By: lunny <xiaolunwen@gmail.com>

* switch to go mod

* Update required changes for new logging func signatures

vendor/github.com/go-redis/redis/internal/error.go

@@ -0,0 +1,89 @@
+package internal
+
+import (
+	"io"
+	"net"
+	"strings"
+
+	"github.com/go-redis/redis/internal/proto"
+)
+
+func IsRetryableError(err error, retryTimeout bool) bool {
+	if err == nil {
+		return false
+	}
+	if err == io.EOF {
+		return true
+	}
+	if netErr, ok := err.(net.Error); ok {
+		if netErr.Timeout() {
+			return retryTimeout
+		}
+		return true
+	}
+	s := err.Error()
+	if s == "ERR max number of clients reached" {
+		return true
+	}
+	if strings.HasPrefix(s, "LOADING ") {
+		return true
+	}
+	if strings.HasPrefix(s, "READONLY ") {
+		return true
+	}
+	if strings.HasPrefix(s, "CLUSTERDOWN ") {
+		return true
+	}
+	return false
+}
+
+func IsRedisError(err error) bool {
+	_, ok := err.(proto.RedisError)
+	return ok
+}
+
+func IsBadConn(err error, allowTimeout bool) bool {
+	if err == nil {
+		return false
+	}
+	if IsRedisError(err) {
+		// #790
+		return IsReadOnlyError(err)
+	}
+	if allowTimeout {
+		if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+			return false
+		}
+	}
+	return true
+}
+
+func IsMovedError(err error) (moved bool, ask bool, addr string) {
+	if !IsRedisError(err) {
+		return
+	}
+
+	s := err.Error()
+	if strings.HasPrefix(s, "MOVED ") {
+		moved = true
+	} else if strings.HasPrefix(s, "ASK ") {
+		ask = true
+	} else {
+		return
+	}
+
+	ind := strings.LastIndex(s, " ")
+	if ind == -1 {
+		return false, false, ""
+	}
+	addr = s[ind+1:]
+	return
+}
+
+func IsLoadingError(err error) bool {
+	return strings.HasPrefix(err.Error(), "LOADING ")
+}
+
+func IsReadOnlyError(err error) bool {
+	return strings.HasPrefix(err.Error(), "READONLY ")
+}