#1: Implement UuidsStorage in Redis

db/factory.go

@@ -3,6 +3,7 @@ package db
 import (
 	"github.com/spf13/viper"
 
+	"github.com/elyby/chrly/api/mojang/queue"
 	"github.com/elyby/chrly/interfaces"
 )
 
@@ -13,6 +14,7 @@ type StorageFactory struct {
 type RepositoriesCreator interface {
 	CreateSkinsRepository() (interfaces.SkinsRepository, error)
 	CreateCapesRepository() (interfaces.CapesRepository, error)
+	CreateMojangUuidsRepository() (queue.UuidsStorage, error)
 }
 
 func (factory *StorageFactory) CreateFactory(backend string) RepositoriesCreator {

db/filesystem.go

@@ -5,6 +5,7 @@ import (
 	"path"
 	"strings"
 
+	"github.com/elyby/chrly/api/mojang/queue"
 	"github.com/elyby/chrly/interfaces"
 	"github.com/elyby/chrly/model"
 )
@@ -26,6 +27,10 @@ func (f FilesystemFactory) CreateCapesRepository() (interfaces.CapesRepository,
 	return &filesStorage{path: path.Join(f.BasePath, f.CapesDirName)}, nil
 }
 
+func (f FilesystemFactory) CreateMojangUuidsRepository() (queue.UuidsStorage, error) {
+	panic("implement me")
+}
+
 func (f FilesystemFactory) validateFactoryConfig() error {
 	if f.BasePath == "" {
 		return &ParamRequired{"basePath"}

db/redis.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"strconv"
 	"strings"
 	"time"
 
@@ -14,6 +15,7 @@ import (
 	"github.com/mediocregopher/radix.v2/redis"
 	"github.com/mediocregopher/radix.v2/util"
 
+	"github.com/elyby/chrly/api/mojang/queue"
 	"github.com/elyby/chrly/interfaces"
 	"github.com/elyby/chrly/model"
 )
@@ -27,7 +29,20 @@ type RedisFactory struct {
 
 // TODO: maybe we should manually return connection to the pool?
 
+// TODO: Why isn't a pointer used here?
 func (f RedisFactory) CreateSkinsRepository() (interfaces.SkinsRepository, error) {
+	return f.createInstance()
+}
+
+func (f RedisFactory) CreateCapesRepository() (interfaces.CapesRepository, error) {
+	panic("capes repository not supported for this storage type")
+}
+
+func (f RedisFactory) CreateMojangUuidsRepository() (queue.UuidsStorage, error) {
+	return f.createInstance()
+}
+
+func (f RedisFactory) createInstance() (*redisDb, error) {
 	connection, err := f.getConnection()
 	if err != nil {
 		return nil, err
@@ -36,10 +51,6 @@ func (f RedisFactory) CreateSkinsRepository() (interfaces.SkinsRepository, error
 	return &redisDb{connection}, nil
 }
 
-func (f RedisFactory) CreateCapesRepository() (interfaces.CapesRepository, error) {
-	panic("capes repository not supported for this storage type")
-}
-
 func (f RedisFactory) getConnection() (*pool.Pool, error) {
 	if f.connection == nil {
 		if f.Host == "" {
@@ -89,7 +100,9 @@ type redisDb struct {
 }
 
 const accountIdToUsernameKey = "hash:username-to-account-id"
+const mojangUsernameToUuidKey = "hash:mojang-username-to-uuid"
 
+// TODO: return connection to the pool after usage
 func (db *redisDb) FindByUsername(username string) (*model.Skin, error) {
 	return findByUsername(username, db.getConn())
 }
@@ -110,6 +123,14 @@ func (db *redisDb) RemoveByUsername(username string) error {
 	return removeByUsername(username, db.getConn())
 }
 
+func (db *redisDb) GetUuid(username string) (string, error) {
+	return findMojangUuidByUsername(username, db.getConn())
+}
+
+func (db *redisDb) StoreUuid(username string, uuid string) {
+	storeMojangUuid(username, uuid, db.getConn())
+}
+
 func (db *redisDb) getConn() util.Cmder {
 	conn, _ := db.conn.Get()
 	return conn
@@ -221,6 +242,28 @@ func save(skin *model.Skin, conn util.Cmder) error {
 	return nil
 }
 
+func findMojangUuidByUsername(username string, conn util.Cmder) (string, error) {
+	response := conn.Cmd("HGET", mojangUsernameToUuidKey, strings.ToLower(username))
+	if response.IsType(redis.Nil) {
+		return "", &queue.ValueNotFound{}
+	}
+
+	data, _ := response.Str()
+	parts := strings.Split(data, ":")
+	timestamp, _ := strconv.ParseInt(parts[1], 10, 64)
+	storedAt := time.Unix(timestamp, 0)
+	if storedAt.Add(time.Hour * 24 * 30).Before(time.Now()) {
+		return "", &queue.ValueNotFound{}
+	}
+
+	return parts[0], nil
+}
+
+func storeMojangUuid(username string, uuid string, conn util.Cmder) {
+	value := uuid + ":" + strconv.FormatInt(time.Now().Unix(), 10)
+	conn.Cmd("HSET", mojangUsernameToUuidKey, strings.ToLower(username), value)
+}
+
 func buildUsernameKey(username string) string {
 	return "username:" + strings.ToLower(username)
 }