Initial commit: Open sourcing all of the Maple Open Technologies code.

cloud/maplefile-backend/internal/usecase/user/getbysesid.go

@@ -0,0 +1,68 @@
+package user
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+
+	"go.uber.org/zap"
+
+	"codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/config"
+	dom_user "codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/internal/domain/user"
+	"codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/pkg/httperror"
+	"codeberg.org/mapleopentech/monorepo/cloud/maplefile-backend/pkg/storage/cache/cassandracache"
+)
+
+type UserGetBySessionIDUseCase interface {
+	Execute(ctx context.Context, sessionID string) (*dom_user.User, error)
+}
+
+type userGetBySessionIDUseCaseImpl struct {
+	config *config.Configuration
+	logger *zap.Logger
+	cache  cassandracache.CassandraCacher
+}
+
+func NewUserGetBySessionIDUseCase(config *config.Configuration, logger *zap.Logger, ca cassandracache.CassandraCacher) UserGetBySessionIDUseCase {
+	logger = logger.Named("UserGetBySessionIDUseCase")
+	return &userGetBySessionIDUseCaseImpl{config, logger, ca}
+}
+
+func (uc *userGetBySessionIDUseCaseImpl) Execute(ctx context.Context, sessionID string) (*dom_user.User, error) {
+	//
+	// STEP 1: Validation.
+	//
+
+	e := make(map[string]string)
+	if sessionID == "" {
+		e["session_id"] = "missing value"
+	} else {
+		//TODO: IMPL.
+	}
+	if len(e) != 0 {
+		uc.logger.Warn("Validation failed for upsert",
+			zap.Any("error", e))
+		return nil, httperror.NewForBadRequest(&e)
+	}
+
+	//
+	// STEP 2:
+	//
+
+	userBytes, err := uc.cache.Get(ctx, sessionID)
+	if err != nil {
+		return nil, err
+	}
+	if userBytes == nil {
+		uc.logger.Warn("record not found")
+		return nil, errors.New("record not found")
+	}
+	var user dom_user.User
+	err = json.Unmarshal(userBytes, &user)
+	if err != nil {
+		uc.logger.Error("unmarshalling failed", zap.Any("err", err))
+		return nil, err
+	}
+
+	return &user, nil
+}