Add Redis Sentinel Authentication Support (#19213)

Gitea was not able to supply any authentication parameters to it. So this brings support to do that, along with some light extraction of a couple of bits into some separate functions for easier testing.

I looked at other libraries supporting similar RedisUri-style connection strings (e.g. Lettuce), but it looks like this type of configuration is beyond what would typically be done in a connection string. Since gitea doesn't have configuration options for manually specifying all this redis connection detail, I went ahead and just chose straightforward names for these new parameters.

modules/nosql/manager_redis_test.go

@@ -0,0 +1,64 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package nosql
+
+import (
+	"net/url"
+	"testing"
+)
+
+func TestRedisUsernameOpt(t *testing.T) {
+	uri, _ := url.Parse("redis://redis:password@myredis/0")
+	opts := getRedisOptions(uri)
+
+	if opts.Username != "redis" {
+		t.Fail()
+	}
+}
+
+func TestRedisPasswordOpt(t *testing.T) {
+	uri, _ := url.Parse("redis://redis:password@myredis/0")
+	opts := getRedisOptions(uri)
+
+	if opts.Password != "password" {
+		t.Fail()
+	}
+}
+
+func TestRedisSentinelUsernameOpt(t *testing.T) {
+	uri, _ := url.Parse("redis+sentinel://redis:password@myredis/0?sentinelusername=suser&sentinelpassword=spass")
+	opts := getRedisOptions(uri).Failover()
+
+	if opts.SentinelUsername != "suser" {
+		t.Fail()
+	}
+}
+
+func TestRedisSentinelPasswordOpt(t *testing.T) {
+	uri, _ := url.Parse("redis+sentinel://redis:password@myredis/0?sentinelusername=suser&sentinelpassword=spass")
+	opts := getRedisOptions(uri).Failover()
+
+	if opts.SentinelPassword != "spass" {
+		t.Fail()
+	}
+}
+
+func TestRedisDatabaseIndexTcp(t *testing.T) {
+	uri, _ := url.Parse("redis://redis:password@myredis/12")
+	opts := getRedisOptions(uri)
+
+	if opts.DB != 12 {
+		t.Fail()
+	}
+}
+
+func TestRedisDatabaseIndexUnix(t *testing.T) {
+	uri, _ := url.Parse("redis+socket:///var/run/redis.sock?database=12")
+	opts := getRedisOptions(uri)
+
+	if opts.DB != 12 {
+		t.Fail()
+	}
+}