Use redis to store the sessions

cmd/web/main.go

@@ -15,7 +15,9 @@ import (
 	"os"
 	"time"
 
+	"github.com/alexedwards/scs/redisstore"
 	"github.com/alexedwards/scs/v2"
+	"github.com/gomodule/redigo/redis"
 )
 
 const portNumber = ":8080"
@@ -80,7 +82,16 @@ func run() (*driver.DB, error) {
 	// change this to true when in production
 	app.InProduction = *inProduction
 
+	// Establish connection pool to Redis.
+	pool := &redis.Pool{
+		MaxIdle: 10,
+		Dial: func() (redis.Conn, error) {
+			return redis.Dial("tcp", "localhost:6379")
+		},
+	}
+
 	session = scs.New()
+	session.Store = redisstore.New(pool)
 	session.Lifetime = 24 * time.Hour
 	session.Cookie.Persist = true
 	session.Cookie.SameSite = http.SameSiteLaxMode