15cb03589c
But that means we have to redirect from the handler. I didn't want to, but I guess that makes it easier when more pages direct to the recipe page.
619 lines
16 KiB
Go
619 lines
16 KiB
Go
package repository
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import (
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"database/sql"
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"encoding/json"
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"fmt"
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"strings"
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domain "github.com/haydenhargreaves/Potion/internal/domain/recipe"
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"github.com/lib/pq"
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)
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type RecipeRepository struct {
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db *sql.DB
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}
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// Compile-time check to ensure the RecipeRepository implements domain.RecipeRepository
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var _ domain.RecipeRepository = (*RecipeRepository)(nil)
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// NewRecipeRepository creates a user repository object which is used by the user service to access
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// the database. Any recipe related database operations will take place in this repository.
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func NewRecipeRepository(db *sql.DB) domain.RecipeRepository {
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return &RecipeRepository{db: db}
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}
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// NOTE: This function modified the provided recipe with the new values, such as id and time stamp
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// CreateRecipe creates a recipe in the database. The recipe provided should contain all data except
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// time stamps and the ID; the database will fill them when the operation succeeds. Any errors will
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// be bubbled to the caller. The recipe parameter is passed by reference and will therefore be updated
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// directly and the new fields (ID, created) can be accessed upon success.
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func (r *RecipeRepository) CreateRecipe(recipe *domain.Recipe) error {
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tx, err := r.db.Begin()
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if err != nil {
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tx.Rollback()
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return err
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}
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query := `INSERT INTO recipes (
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title, description, instructions, serves, difficulty,
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duration, category, ingredients, userid, modified, created
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) VALUES (
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$1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11
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) RETURNING id;`
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// NOTE: Data steps
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// cast duration to JSON
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// cast ingredients to JSON
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// cast category to string
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// use nil for the modified time
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durationJSON, err := json.Marshal(recipe.Duration)
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if err != nil {
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return err
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}
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ingredientsJSON, err := json.Marshal(recipe.Ingredients)
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if err != nil {
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return err
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}
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var id int
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if err = tx.QueryRow(
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query,
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recipe.Title,
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recipe.Description,
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pq.Array(recipe.Instructions),
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recipe.Serves,
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recipe.Difficulty,
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durationJSON,
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string(recipe.Category),
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ingredientsJSON,
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recipe.UserId,
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nil,
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recipe.Created,
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).Scan(&id); err != nil {
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tx.Rollback()
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return err
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}
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if err := tx.Commit(); err != nil {
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tx.Rollback()
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return err
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}
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// Set the new ID
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recipe.Id = id
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return nil
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}
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// GetRecipe gets a recipe from the database via its ID. The operation is wrapped in a transaction
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// for added safety. The repository will not check for a nil result, instead the service will. Callers
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// are responsible for protecting against double nil results. Any errors will be bubbled to the caller.
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func (r *RecipeRepository) GetRecipe(id int, userId *int) (*domain.Recipe, error) {
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tx, err := r.db.Begin()
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if err != nil {
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tx.Rollback()
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return nil, err
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}
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query := `
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SELECT
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id, title, description, instructions, serves, difficulty, duration, category, ingredients,
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userid, modified, created
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FROM recipes
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WHERE id = $1
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`
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var durationBytes []byte
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var ingredientBytes []byte
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var recipe domain.Recipe
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if err := tx.QueryRow(query, id).Scan(
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&recipe.Id,
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&recipe.Title,
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&recipe.Description,
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pq.Array(&recipe.Instructions),
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&recipe.Serves,
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&recipe.Difficulty,
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&durationBytes,
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&recipe.Category,
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&ingredientBytes,
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&recipe.UserId,
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&recipe.Modified,
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&recipe.Created,
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); err != nil {
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return nil, fmt.Errorf("Failed to location recipe in database: %s", err.Error())
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}
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// Parse duration
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if len(durationBytes) > 0 {
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var duration domain.RecipeDuration
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if err := json.Unmarshal(durationBytes, &duration); err != nil {
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return nil, fmt.Errorf("Failed to parse duration from database: %s", err.Error())
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}
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recipe.Duration = duration
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} else {
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recipe.Duration = domain.RecipeDuration{}
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}
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// Parse ingredient
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if len(ingredientBytes) > 0 {
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var ingredients []domain.RecipeIngredient
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if err := json.Unmarshal(ingredientBytes, &ingredients); err != nil {
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return nil, fmt.Errorf("Failed to parse ingredients from database: %s", err.Error())
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}
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recipe.Ingredients = ingredients
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} else {
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recipe.Ingredients = []domain.RecipeIngredient{}
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}
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// Add tags
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if err := r.GetRecipeTags(&recipe); err != nil {
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fmt.Printf("ERROR getting recipe tags. %s\n", err.Error())
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}
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// Get favorite status, if user id is provided
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if userId != nil {
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if err := r.GetRecipeFavorite(&recipe, *userId); err != nil {
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fmt.Printf("ERROR getting recipe favorite status. %s\n", err.Error())
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}
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} else {
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recipe.Favorite = false
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}
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if err := tx.Commit(); err != nil {
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tx.Rollback()
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return nil, err
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}
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return &recipe, nil
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}
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// isBitActive returns true when the bit at pos (0 indexed) is true.
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func isBitActive(bits, pos int) bool {
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return (bits>>pos)&1 == 1
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}
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// SearchRecipes will search the recipe table using the provided filters and return an unbound list
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// of recipes. The filters are fairly complex, they are stored as bit masks. A more details
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// description can be found in the recipe service implementation. Any errors will be bubbled to the
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// caller.
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//
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// TODO: Pagination is required, to provide infinite scroll.
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func (r *RecipeRepository) SearchRecipes(filters domain.SearchFilters) ([]domain.Recipe, error) {
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tx, err := r.db.Begin()
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if err != nil {
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tx.Rollback()
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return nil, err
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}
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// Compute meals type filters (there are 7 bits)
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var mealConditions []string
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for i := range 7 {
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if isBitActive(filters.MealType, i) {
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mealConditions = append(mealConditions, fmt.Sprintf("category = '%s'", domain.ParseMeal(i)))
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}
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}
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// Compute time filters (there are 5 bits)
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var timeConditions []string
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for i := range 5 {
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var cond string
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if isBitActive(filters.Time, i) {
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switch i {
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case 0:
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cond = "(duration->>'total')::int < 15"
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case 1:
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cond = "(duration->>'total')::int BETWEEN 15 AND 30"
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case 2:
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cond = "(duration->>'total')::int BETWEEN 30 AND 60"
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case 3:
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cond = "(duration->>'total')::int BETWEEN 60 AND 120"
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case 4:
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cond = "(duration->>'total')::int > 120"
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}
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timeConditions = append(timeConditions, cond)
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}
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}
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// Compute difficulty filters (there are 5 bits)
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var difficultyConditions []string
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for i := range 5 {
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if isBitActive(filters.Difficulty, i) {
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cond := fmt.Sprintf("difficulty = '%d'", i+1)
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difficultyConditions = append(difficultyConditions, cond)
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}
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}
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// Compute serving size filters (there are 5 bits)
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var servingConditions []string
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for i := range 5 {
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var cond string
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if isBitActive(filters.ServingSize, i) {
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switch i {
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case 0:
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cond = "serves BETWEEN 1 AND 2"
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case 1:
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cond = "serves BETWEEN 2 AND 4"
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case 2:
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cond = "serves BETWEEN 4 AND 6"
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case 3:
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cond = "serves BETWEEN 6 AND 8"
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case 4:
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cond = "serves > 8"
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}
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servingConditions = append(servingConditions, cond)
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}
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}
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// Merge condition strings
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mealString := fmt.Sprintf("(%s)", strings.Join(mealConditions, " OR "))
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timeString := fmt.Sprintf("(%s)", strings.Join(timeConditions, " OR "))
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difficultyString := fmt.Sprintf("(%s)", strings.Join(difficultyConditions, " OR "))
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servingString := fmt.Sprintf("(%s)", strings.Join(servingConditions, " OR "))
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// Combine condition strings
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var conditions []string
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if len(mealConditions) > 0 {
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conditions = append(conditions, mealString)
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}
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if len(timeConditions) > 0 {
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conditions = append(conditions, timeString)
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}
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if len(difficultyConditions) > 0 {
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conditions = append(conditions, difficultyString)
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}
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if len(servingConditions) > 0 {
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conditions = append(conditions, servingString)
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}
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// Define columns to select. More fields can be added if the full text search is required
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columns := []string{
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"id",
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"title",
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"description",
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"instructions",
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"serves",
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"difficulty",
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"duration",
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"category",
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"ingredients",
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"userid",
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"modified",
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"created",
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}
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// Create search vector query
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var orderBy string = ""
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if filters.Search != "" {
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vector_query := strings.ReplaceAll(filters.Search, " ", " | ")
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conditions = append(
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conditions,
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fmt.Sprintf("search_vector @@ to_tsquery('english', '%s')", vector_query),
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)
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template := `
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ORDER BY
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ts_rank(search_vector, to_tsquery('english', '%s')) DESC,
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ts_rank_cd(search_vector, to_tsquery('english', '%s')) DESC
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`
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orderBy = fmt.Sprintf(template, vector_query, vector_query)
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}
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// Generate the query
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query := fmt.Sprintf("SELECT %s FROM recipes", strings.Join(columns, ","))
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// Convert and append conditions if provided
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if len(conditions) > 0 {
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conditionsString := fmt.Sprintf("WHERE %s", strings.Join(conditions, " AND "))
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query = fmt.Sprintf("%s %s", query, conditionsString)
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}
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// Append sorting order if exists
|
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if len(orderBy) > 0 {
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query = fmt.Sprintf("%s %s", query, orderBy)
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}
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// Finish it off with a colon!
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query += ";"
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|
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// Execute the query
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rows, err := tx.Query(query)
|
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if err != nil {
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return nil, fmt.Errorf("failed to query recipes: %w", err)
|
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}
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defer rows.Close()
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|
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var recipes []domain.Recipe
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for rows.Next() {
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// Parsed values location
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var recipe domain.Recipe
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var durationBytes []byte
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var ingredientBytes []byte
|
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if err := rows.Scan(
|
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&recipe.Id,
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&recipe.Title,
|
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&recipe.Description,
|
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pq.Array(&recipe.Instructions),
|
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&recipe.Serves,
|
|
&recipe.Difficulty,
|
|
&durationBytes,
|
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&recipe.Category,
|
|
&ingredientBytes,
|
|
&recipe.UserId,
|
|
&recipe.Modified,
|
|
&recipe.Created,
|
|
); err != nil {
|
|
return nil, fmt.Errorf("failed to scan recipe row: %w", err)
|
|
}
|
|
|
|
// Parse duration from bytes
|
|
if len(durationBytes) > 0 {
|
|
var duration domain.RecipeDuration
|
|
if err := json.Unmarshal(durationBytes, &duration); err != nil {
|
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return nil, fmt.Errorf("failed to parse duration for recipe ID %d: %w", recipe.Id, err)
|
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}
|
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recipe.Duration = duration
|
|
} else {
|
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recipe.Duration = domain.RecipeDuration{}
|
|
}
|
|
|
|
// Parse ingredients from bytes
|
|
if len(ingredientBytes) > 0 {
|
|
var ingredients []domain.RecipeIngredient
|
|
if err := json.Unmarshal(ingredientBytes, &ingredients); err != nil {
|
|
return nil, fmt.Errorf("failed to parse ingredients for recipe ID %d: %w", recipe.Id, err)
|
|
}
|
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recipe.Ingredients = ingredients
|
|
} else {
|
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recipe.Ingredients = []domain.RecipeIngredient{}
|
|
}
|
|
|
|
// Add tags
|
|
if err := r.GetRecipeTags(&recipe); err != nil {
|
|
fmt.Printf("ERROR getting recipe tags. %s\n", err.Error())
|
|
}
|
|
|
|
recipes = append(recipes, recipe)
|
|
}
|
|
|
|
if err := tx.Commit(); err != nil {
|
|
tx.Rollback()
|
|
return nil, err
|
|
}
|
|
|
|
return recipes, nil
|
|
}
|
|
|
|
// CreateRecipeTags accepts a list of tags (names) and a recipe (already created by the DB) and
|
|
// creates the tags that do not exists, and adds those that do exist to the mapping table for the
|
|
// recipe. The result is records in the RecipeTags mapping table that represent all of the new
|
|
// and existing tags provided to this function. The recipe object must only contain an ID to call
|
|
// this function successfully, therefore, it must be an existing recipe. Any errors will be bubbled
|
|
// to the caller.
|
|
func (r *RecipeRepository) CreateRecipeTags(recipe domain.Recipe, tags []string) error {
|
|
tx, err := r.db.Begin()
|
|
if err != nil {
|
|
tx.Rollback()
|
|
return err
|
|
}
|
|
|
|
// Normalize the tag names (lower case with trimmed space)
|
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normalized := make(map[string]struct{}) // Use map to disallow duplicates
|
|
for _, tag := range tags {
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normalized[strings.ToLower(strings.TrimSpace(tag))] = struct{}{}
|
|
}
|
|
|
|
// Insert the tags into the DB and return their IDS into the tag ID list
|
|
var tagIds []int
|
|
for tag := range normalized {
|
|
var tagId int
|
|
|
|
query := `
|
|
INSERT INTO tags (name) VALUES ($1)
|
|
ON CONFLICT (name) DO UPDATE SET name = EXCLUDED.name
|
|
RETURNING id;
|
|
`
|
|
|
|
err := tx.QueryRow(query, tag).Scan(&tagId)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to retrieve or create tag. %s\n", err.Error())
|
|
}
|
|
|
|
tagIds = append(tagIds, tagId)
|
|
}
|
|
|
|
// Using a prepared statement, execute the mapping insertions one-by-one
|
|
for _, id := range tagIds {
|
|
stmt, err := tx.Prepare("INSERT INTO RecipeTags (RecipeId, TagId) VALUES ($1, $2);")
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to create statement for recipe tag mapping. %s\n", err.Error())
|
|
}
|
|
defer stmt.Close()
|
|
|
|
if _, err := stmt.Exec(recipe.Id, id); err != nil {
|
|
return fmt.Errorf("Failed to insert tag-recipe-mapping. %s\n", err.Error())
|
|
}
|
|
}
|
|
|
|
if err := tx.Commit(); err != nil {
|
|
tx.Rollback()
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetUserRecipes gets a list of a users owned recipes. This function does not ensure the user is
|
|
// authenticated or exists. If nothing is found, a blank slice will be returned. The resulting list
|
|
// is sorted by the created dates, newest first. Any errors will be bubbled to the caller.
|
|
func (r *RecipeRepository) GetUserRecipes(id int) ([]domain.Recipe, error) {
|
|
tx, err := r.db.Begin()
|
|
if err != nil {
|
|
tx.Rollback()
|
|
return nil, err
|
|
}
|
|
|
|
query := `
|
|
SELECT id, title, description, instructions, serves, difficulty, duration, category, ingredients,
|
|
userid, modified, created
|
|
FROM recipes
|
|
WHERE userid = $1
|
|
ORDER BY created DESC;
|
|
`
|
|
|
|
rows, err := tx.Query(query, id)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Failed to query DB for user recipes. %s\n", err.Error())
|
|
}
|
|
defer rows.Close()
|
|
|
|
// Prepare statement for tag query
|
|
// tagQuery := `
|
|
// `
|
|
|
|
var recipes []domain.Recipe
|
|
for rows.Next() {
|
|
var recipe domain.Recipe
|
|
var durationBytes []byte
|
|
var ingredientBytes []byte
|
|
|
|
// Scan results from recipe query onto recipe object
|
|
if err := rows.Scan(
|
|
&recipe.Id,
|
|
&recipe.Title,
|
|
&recipe.Description,
|
|
pq.Array(&recipe.Instructions),
|
|
&recipe.Serves,
|
|
&recipe.Difficulty,
|
|
&durationBytes,
|
|
&recipe.Category,
|
|
&ingredientBytes,
|
|
&recipe.UserId,
|
|
&recipe.Modified,
|
|
&recipe.Created,
|
|
); err != nil {
|
|
return nil, fmt.Errorf("Failed to scan row onto recipe object. %s\n", err.Error())
|
|
}
|
|
|
|
// Parse duration
|
|
if len(durationBytes) > 0 {
|
|
var duration domain.RecipeDuration
|
|
if err := json.Unmarshal(durationBytes, &duration); err != nil {
|
|
return nil, fmt.Errorf("Failed to parse duration from database: %s", err.Error())
|
|
}
|
|
|
|
recipe.Duration = duration
|
|
} else {
|
|
recipe.Duration = domain.RecipeDuration{}
|
|
}
|
|
|
|
// Parse ingredient
|
|
if len(ingredientBytes) > 0 {
|
|
var ingredients []domain.RecipeIngredient
|
|
if err := json.Unmarshal(ingredientBytes, &ingredients); err != nil {
|
|
return nil, fmt.Errorf("Failed to parse ingredients from database: %s", err.Error())
|
|
}
|
|
|
|
recipe.Ingredients = ingredients
|
|
} else {
|
|
recipe.Ingredients = []domain.RecipeIngredient{}
|
|
}
|
|
|
|
// Add tags
|
|
if err := r.GetRecipeTags(&recipe); err != nil {
|
|
fmt.Printf("ERROR getting recipe tags. %s\n", err.Error())
|
|
}
|
|
|
|
// Get favorite status
|
|
if err := r.GetRecipeFavorite(&recipe, id); err != nil {
|
|
fmt.Printf("ERROR getting recipe favorite status. %s\n", err.Error())
|
|
}
|
|
|
|
recipes = append(recipes, recipe)
|
|
}
|
|
|
|
if err := tx.Commit(); err != nil {
|
|
tx.Rollback()
|
|
return nil, err
|
|
}
|
|
|
|
return recipes, nil
|
|
}
|
|
|
|
// GetRecipeTags requires a recipe to be filled with at least an ID. This function will use the ID
|
|
// defined in the provided recipe to fill the Tags array with the recipe's tags from the database.
|
|
// The recipe is modified in place and is not returned. Any errors will be bubbled to the caller.
|
|
func (r *RecipeRepository) GetRecipeTags(recipe *domain.Recipe) error {
|
|
tx, err := r.db.Begin()
|
|
if err != nil {
|
|
tx.Rollback()
|
|
return err
|
|
}
|
|
|
|
recipe.Tags = []domain.Tag{}
|
|
|
|
query := `
|
|
SELECT t.* FROM tags t
|
|
JOIN recipetags rt ON rt.tagid = t.id
|
|
WHERE rt.recipeid = $1;
|
|
`
|
|
rows, err := tx.Query(query, recipe.Id)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to get tags for recipe. %s\n", err.Error())
|
|
}
|
|
defer rows.Close()
|
|
|
|
for rows.Next() {
|
|
var tag domain.Tag
|
|
|
|
err := rows.Scan(&tag.Id, &tag.Name, &tag.Created)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to scan tag onto domain model. %s\n", err.Error())
|
|
}
|
|
|
|
recipe.Tags = append(recipe.Tags, tag)
|
|
}
|
|
|
|
if err := tx.Commit(); err != nil {
|
|
tx.Rollback()
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetRecipeFavorite requires a recipe to be filled with at least an ID. This function will use the
|
|
// ID defined in the provided recipe to fill the favorite status of the recipe, based on the provided
|
|
// userId. The recipe is modified in place and is not returned. Any errors will be bubbled to the caller.
|
|
func (r *RecipeRepository) GetRecipeFavorite(recipe *domain.Recipe, userId int) error {
|
|
tx, err := r.db.Begin()
|
|
if err != nil {
|
|
tx.Rollback()
|
|
return err
|
|
}
|
|
|
|
query := `
|
|
SELECT COUNT(*)
|
|
FROM favorites
|
|
WHERE recipeid = $1 AND userid = $2;
|
|
`
|
|
|
|
var count int
|
|
if err := tx.QueryRow(query, recipe.Id, userId).Scan(&count); err != nil {
|
|
tx.Rollback()
|
|
return fmt.Errorf("Failed to get recipe favorite. %s", err.Error())
|
|
}
|
|
|
|
recipe.Favorite = count > 0
|
|
|
|
return nil
|
|
}
|