Allow common redis and leveldb connections (#12385)

* Allow common redis and leveldb connections

Prevents multiple reopening of redis and leveldb connections to the same
place by sharing connections.

Further allows for more configurable redis connection type using the
redisURI and a leveldbURI scheme.

Signed-off-by: Andrew Thornton <[email protected]>

* add unit-test

Signed-off-by: Andrew Thornton <[email protected]>

* as per @lunny

Signed-off-by: Andrew Thornton <[email protected]>

* add test

Signed-off-by: Andrew Thornton <[email protected]>

* Update modules/cache/cache_redis.go

* Update modules/queue/queue_disk.go

* Update modules/cache/cache_redis.go

* Update modules/cache/cache_redis.go

* Update modules/queue/unique_queue_disk.go

* Update modules/queue/queue_disk.go

* Update modules/queue/unique_queue_disk.go

* Update modules/session/redis.go

Co-authored-by: techknowlogick <[email protected]>
Co-authored-by: Lauris BH <[email protected]>

modules/queue/queue_redis.go

@@ -5,12 +5,10 @@
 package queue
 
 import (
-	"errors"
-	"strings"
-
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/nosql"
 
-	"github.com/go-redis/redis"
+	"github.com/go-redis/redis/v7"
 )
 
 // RedisQueueType is the type for redis queue
@@ -75,11 +73,8 @@ type RedisByteFIFO struct {
 
 // RedisByteFIFOConfiguration is the configuration for the RedisByteFIFO
 type RedisByteFIFOConfiguration struct {
-	Network   string
-	Addresses string
-	Password  string
-	DBIndex   int
-	QueueName string
+	ConnectionString string
+	QueueName        string
 }
 
 // NewRedisByteFIFO creates a ByteFIFO formed from a redisClient
@@ -87,21 +82,7 @@ func NewRedisByteFIFO(config RedisByteFIFOConfiguration) (*RedisByteFIFO, error)
 	fifo := &RedisByteFIFO{
 		queueName: config.QueueName,
 	}
-	dbs := strings.Split(config.Addresses, ",")
-	if len(dbs) == 0 {
-		return nil, errors.New("no redis host specified")
-	} else if len(dbs) == 1 {
-		fifo.client = redis.NewClient(&redis.Options{
-			Network:  config.Network,
-			Addr:     strings.TrimSpace(dbs[0]), // use default Addr
-			Password: config.Password,           // no password set
-			DB:       config.DBIndex,            // use default DB
-		})
-	} else {
-		fifo.client = redis.NewClusterClient(&redis.ClusterOptions{
-			Addrs: dbs,
-		})
-	}
+	fifo.client = nosql.GetManager().GetRedisClient(config.ConnectionString)
 	if err := fifo.client.Ping().Err(); err != nil {
 		return nil, err
 	}