feat: adding redis to save sessions

.gitignore

@@ -1,2 +1,3 @@
 .direnv
 /.go/
+/dump.rdb

flake.nix

@@ -18,6 +18,7 @@
             pkgs.nodePackages.tailwindcss
             pkgs.nodePackages.prettier
             pkgs.gnumake
+            pkgs.redis
           ];
           shellHook = ''
             export GOPATH=$PWD/.go

go.mod

@@ -1,3 +1,9 @@
 module sunshine.industries/some-automoderation
 
 go 1.20
+
+require (
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/redis/go-redis/v9 v9.2.1 // indirect
+)

go.sum

@@ -0,0 +1,6 @@
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/redis/go-redis/v9 v9.2.1 h1:WlYJg71ODF0dVspZZCpYmoF1+U1Jjk9Rwd7pq6QmlCg=
+github.com/redis/go-redis/v9 v9.2.1/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M=

main.go

@@ -1,24 +1,37 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"log"
 	"net/http"
 
+	"github.com/redis/go-redis/v9"
+
 	"sunshine.industries/some-automoderation/routes"
 	"sunshine.industries/some-automoderation/sessions"
 )
 
+var ctx = context.Background()
+
 func main() {
 	var port int
 	flag.IntVar(&port, "port", 8080, "Port on which the server should start")
 	flag.Parse()
+	var redisPort int
+	flag.IntVar(&redisPort, "redisPort", 7777, "Port on which server should connect to redis db")
+
+	rdb := redis.NewClient(&redis.Options{
+		Addr: fmt.Sprintf("localhost:%d", redisPort),
+		Password: "",
+		DB: 0,
+	})
 
 	fmt.Printf("Server will start on port %d\n", port)
 
-	sessions := sessions.DummySM{}
-	routes.RegisterRoutes(&sessions)
+	sessions := sessions.RedisSM{ Rdb: rdb, }
+	routes.RegisterRoutes(sessions)
 
 	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), nil))
 }

routes/login_page.go

@@ -10,7 +10,7 @@ import (
 	"sunshine.industries/some-automoderation/sessions"
 )
 
-func registerLoginRoutes(templateFs *embed.FS, sessions *sessions.DummySM) {
+func registerLoginRoutes(templateFs *embed.FS, sessionSM sessions.SessionManagement) {
 	// login page
 	http.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
 		var templFile = "templates/login.gohtml"
@@ -36,9 +36,12 @@ func registerLoginRoutes(templateFs *embed.FS, sessions *sessions.DummySM) {
 		roomId := 1 // would be taken from rooms interface from redis
 		// would be either taken from room info on correct person pass or created
 		personId := 111
-		sessions.Save(int64(roomId), int64(personId))
+		id, err := sessionSM.Save(int64(roomId), int64(personId))
+		if err != nil {
+			log.Printf("/login/submit > error saving session %s", err)
+		}
 
-		fmt.Fprintf(w, "room things %s & %s, personal things %s and %s", rn, rp, pn, pp)
+		fmt.Fprintf(w, "is is %d. room things %s & %s, personal things %s and %s", id, rn, rp, pn, pp)
 		// i suppose here i'll need to
 		// a) check if room password OK
 		// b) get room data

routes/routes.go

@@ -15,7 +15,7 @@ var templateFs embed.FS
 //go:embed static
 var staticFilesFs embed.FS
 
-func RegisterRoutes(sessions *sessions.DummySM) {
+func RegisterRoutes(sessions sessions.SessionManagement) {
 	// login page
 	registerLoginRoutes(&templateFs, sessions)
 

sessions/sessions_manager.go

@@ -1,27 +1,69 @@
 package sessions
 
 import (
+	"context"
+	"fmt"
 	"log"
+	"math/rand"
+
+	"github.com/redis/go-redis/v9"
 )
 
 type SessionData struct {
-	sessionId int64
-	roomId int64
-	personId int64
+	SessionId int64 `redis:"session_id"`
+	RoomId    int64 `redis:"room_id"`
+	PersonId  int64 `redis:"person_id"`
 }
 
 type SessionManagement interface {
 	Get(sessionId int64) SessionData
-	Save(roomId int64, personId int64) int64
+	Save(roomId int64, personId int64) (int64, error)
 }
 
-type DummySM struct {}
+var ctx = context.Background()
 
-func (d DummySM)Get(sessionId int64) SessionData {
+const sessionPrefix = "session"
+
+func sessionIdToKey(sessionId int64) string {
+	return fmt.Sprintf("%s:%d", sessionPrefix, sessionId)
+}
+
+type RedisSM struct {
+	Rdb *redis.Client
+}
+
+func (redisSM RedisSM) Get(sessionId int64) SessionData {
+	var foundSession SessionData
+	err := redisSM.Rdb.HGetAll(ctx, sessionIdToKey(sessionId)).Scan(foundSession)
+	if err != nil {
+		log.Printf("> error reading %d", sessionId)
+		return SessionData{}
+	}
+	log.Printf("> successfully found %d %+v", sessionId, foundSession)
+	return foundSession
+}
+func (redisSM RedisSM) Save(roomId int64, personId int64) (int64, error) {
+	randId := rand.Int63()
+	newSession := SessionData{
+		SessionId: randId,
+		RoomId:    roomId,
+		PersonId:  personId,
+	}
+	err := redisSM.Rdb.HSet(ctx, sessionIdToKey(randId), newSession).Err()
+	if err != nil {
+		log.Printf("> error! saving session %+v %s", newSession, err)
+		return 0, fmt.Errorf("error saving new session: %+v with %s", newSession, err)
+	}
+	return randId, nil
+}
+
+type DummySM struct{}
+
+func (d DummySM) Get(sessionId int64) SessionData {
 	log.Printf("get dummy session by %d", sessionId)
 	return SessionData{}
 }
-func (d DummySM)Save(roomId int64, personId int64) int64 {
+func (d DummySM) Save(roomId int64, personId int64) (int64, error) {
 	log.Printf("save dummy session with %d %d", roomId, personId)
-	return 1
+	return 1, nil
 }