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/README.md

@@ -0,0 +1,146 @@
+# Redis client for Golang
+
+[![Build Status](https://travis-ci.org/go-redis/redis.png?branch=master)](https://travis-ci.org/go-redis/redis)
+[![GoDoc](https://godoc.org/github.com/go-redis/redis?status.svg)](https://godoc.org/github.com/go-redis/redis)
+[![Airbrake](https://img.shields.io/badge/kudos-airbrake.io-orange.svg)](https://airbrake.io)
+
+Supports:
+
+- Redis 3 commands except QUIT, MONITOR, SLOWLOG and SYNC.
+- Automatic connection pooling with [circuit breaker](https://en.wikipedia.org/wiki/Circuit_breaker_design_pattern) support.
+- [Pub/Sub](https://godoc.org/github.com/go-redis/redis#PubSub).
+- [Transactions](https://godoc.org/github.com/go-redis/redis#Multi).
+- [Pipeline](https://godoc.org/github.com/go-redis/redis#example-Client-Pipeline) and [TxPipeline](https://godoc.org/github.com/go-redis/redis#example-Client-TxPipeline).
+- [Scripting](https://godoc.org/github.com/go-redis/redis#Script).
+- [Timeouts](https://godoc.org/github.com/go-redis/redis#Options).
+- [Redis Sentinel](https://godoc.org/github.com/go-redis/redis#NewFailoverClient).
+- [Redis Cluster](https://godoc.org/github.com/go-redis/redis#NewClusterClient).
+- [Cluster of Redis Servers](https://godoc.org/github.com/go-redis/redis#example-NewClusterClient--ManualSetup) without using cluster mode and Redis Sentinel.
+- [Ring](https://godoc.org/github.com/go-redis/redis#NewRing).
+- [Instrumentation](https://godoc.org/github.com/go-redis/redis#ex-package--Instrumentation).
+- [Cache friendly](https://github.com/go-redis/cache).
+- [Rate limiting](https://github.com/go-redis/redis_rate).
+- [Distributed Locks](https://github.com/bsm/redis-lock).
+
+API docs: https://godoc.org/github.com/go-redis/redis.
+Examples: https://godoc.org/github.com/go-redis/redis#pkg-examples.
+
+## Installation
+
+Install:
+
+```shell
+go get -u github.com/go-redis/redis
+```
+
+Import:
+
+```go
+import "github.com/go-redis/redis"
+```
+
+## Quickstart
+
+```go
+func ExampleNewClient() {
+	client := redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "", // no password set
+		DB:       0,  // use default DB
+	})
+
+	pong, err := client.Ping().Result()
+	fmt.Println(pong, err)
+	// Output: PONG <nil>
+}
+
+func ExampleClient() {
+	err := client.Set("key", "value", 0).Err()
+	if err != nil {
+		panic(err)
+	}
+
+	val, err := client.Get("key").Result()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("key", val)
+
+	val2, err := client.Get("key2").Result()
+	if err == redis.Nil {
+		fmt.Println("key2 does not exist")
+	} else if err != nil {
+		panic(err)
+	} else {
+		fmt.Println("key2", val2)
+	}
+	// Output: key value
+	// key2 does not exist
+}
+```
+
+## Howto
+
+Please go through [examples](https://godoc.org/github.com/go-redis/redis#pkg-examples) to get an idea how to use this package.
+
+## Look and feel
+
+Some corner cases:
+
+```go
+// SET key value EX 10 NX
+set, err := client.SetNX("key", "value", 10*time.Second).Result()
+
+// SORT list LIMIT 0 2 ASC
+vals, err := client.Sort("list", redis.Sort{Offset: 0, Count: 2, Order: "ASC"}).Result()
+
+// ZRANGEBYSCORE zset -inf +inf WITHSCORES LIMIT 0 2
+vals, err := client.ZRangeByScoreWithScores("zset", redis.ZRangeBy{
+	Min: "-inf",
+	Max: "+inf",
+	Offset: 0,
+	Count: 2,
+}).Result()
+
+// ZINTERSTORE out 2 zset1 zset2 WEIGHTS 2 3 AGGREGATE SUM
+vals, err := client.ZInterStore("out", redis.ZStore{Weights: []int64{2, 3}}, "zset1", "zset2").Result()
+
+// EVAL "return {KEYS[1],ARGV[1]}" 1 "key" "hello"
+vals, err := client.Eval("return {KEYS[1],ARGV[1]}", []string{"key"}, "hello").Result()
+```
+
+## Benchmark
+
+go-redis vs redigo:
+
+```
+BenchmarkSetGoRedis10Conns64Bytes-4 	  200000	      7621 ns/op	     210 B/op	       6 allocs/op
+BenchmarkSetGoRedis100Conns64Bytes-4	  200000	      7554 ns/op	     210 B/op	       6 allocs/op
+BenchmarkSetGoRedis10Conns1KB-4     	  200000	      7697 ns/op	     210 B/op	       6 allocs/op
+BenchmarkSetGoRedis100Conns1KB-4    	  200000	      7688 ns/op	     210 B/op	       6 allocs/op
+BenchmarkSetGoRedis10Conns10KB-4    	  200000	      9214 ns/op	     210 B/op	       6 allocs/op
+BenchmarkSetGoRedis100Conns10KB-4   	  200000	      9181 ns/op	     210 B/op	       6 allocs/op
+BenchmarkSetGoRedis10Conns1MB-4     	    2000	    583242 ns/op	    2337 B/op	       6 allocs/op
+BenchmarkSetGoRedis100Conns1MB-4    	    2000	    583089 ns/op	    2338 B/op	       6 allocs/op
+BenchmarkSetRedigo10Conns64Bytes-4  	  200000	      7576 ns/op	     208 B/op	       7 allocs/op
+BenchmarkSetRedigo100Conns64Bytes-4 	  200000	      7782 ns/op	     208 B/op	       7 allocs/op
+BenchmarkSetRedigo10Conns1KB-4      	  200000	      7958 ns/op	     208 B/op	       7 allocs/op
+BenchmarkSetRedigo100Conns1KB-4     	  200000	      7725 ns/op	     208 B/op	       7 allocs/op
+BenchmarkSetRedigo10Conns10KB-4     	  100000	     18442 ns/op	     208 B/op	       7 allocs/op
+BenchmarkSetRedigo100Conns10KB-4    	  100000	     18818 ns/op	     208 B/op	       7 allocs/op
+BenchmarkSetRedigo10Conns1MB-4      	    2000	    668829 ns/op	     226 B/op	       7 allocs/op
+BenchmarkSetRedigo100Conns1MB-4     	    2000	    679542 ns/op	     226 B/op	       7 allocs/op
+```
+
+Redis Cluster:
+
+```
+BenchmarkRedisPing-4                	  200000	      6983 ns/op	     116 B/op	       4 allocs/op
+BenchmarkRedisClusterPing-4         	  100000	     11535 ns/op	     117 B/op	       4 allocs/op
+```
+
+## See also
+
+- [Golang PostgreSQL ORM](https://github.com/go-pg/pg)
+- [Golang msgpack](https://github.com/vmihailenco/msgpack)
+- [Golang message task queue](https://github.com/go-msgqueue/msgqueue)