Merge pull request #5 from KristianJBorgwarth/feat/uow

setup(uow): uow implementaion

core/handlers/create_note.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"os"
 
@@ -18,11 +19,12 @@ type createNoteCommand struct {
 }
 
 type CreateNoteHandler struct {
+	uow      repositories.UnitOfWork
 	noteRepo repositories.NoteRepository
 	tagRepo  repositories.TagRepository
 }
 
-func (h CreateNoteHandler) Handle(params []byte) (*rpc.Response, *rpc.Error) {
+func (h CreateNoteHandler) Handle(ctx context.Context, params []byte) (*rpc.Response, *rpc.Error) {
 	var cmd createNoteCommand
 
 	if err := json.Unmarshal(params, &cmd); err != nil {

persistence/repositories/note_repository.go

@@ -1,21 +1,22 @@
 package repositories
 
-import "database/sql"
+import (
+	"context"
+)
 
 type NoteRepository interface {
-	Upsert(title string, path string, slug string) error
+	Upsert(ctx context.Context, title string, path string, slug string) error
 }
 
 type noteRepository struct {
-	db *sql.DB
+	dbCtx DBContext
 }
 
-func NewNoteRepository(db *sql.DB) NoteRepository {
-	return &noteRepository{db: db}
+func NewNoteRepository(dbContext DBContext) NoteRepository {
+	return &noteRepository{dbCtx: dbContext}
 }
 
-
-func (r *noteRepository) Upsert(title string, path string, slug string) error {
+func (r *noteRepository) Upsert(ctx context.Context, title string, path string, slug string) error {
 	query := `
 	INSERT INTO notes (title, path, slug)
 	VALUES ($1, $2, $3)
@@ -23,6 +24,6 @@ func (r *noteRepository) Upsert(title string, path string, slug string) error {
 	SET title = EXCLUDED.title,
 	    path = EXCLUDED.path;
 	`
-	_, err := r.db.Exec(query, title, path, slug)
+	_, err := r.dbCtx.ExecContext(ctx, query, title, path, slug)
 	return err
 }

persistence/repositories/tag_repository.go

@@ -1,33 +1,27 @@
 package repositories
 
 import (
-	"database/sql"
+	"context"
 	"strings"
 )
 
 type TagRepository interface {
-	Upsert(names []string) error
+	Upsert(ctx context.Context, names []string) error
 }
 
 type tagRepository struct {
-	db *sql.DB
+	dbContext DBContext
 }
 
-func NewTagRepository(db *sql.DB) TagRepository {
-	return &tagRepository{db: db}
+func NewTagRepository(dbContext DBContext) TagRepository {
+	return &tagRepository{dbContext: dbContext}
 }
 
-func (r *tagRepository) Upsert(names []string) error {
+func (r *tagRepository) Upsert(ctx context.Context, names []string) error {
 	if len(names) == 0 {
 		return nil
 	}
 
-	tx, err := r.db.Begin()
-	if err != nil {
-		return err
-	}
-	defer tx.Rollback()
-
 	placeholders := make([]string, 0, len(names))
 	args := make([]any, 0, len(names))
 
@@ -42,11 +36,12 @@ func (r *tagRepository) Upsert(names []string) error {
 		"SELECT name FROM input " +
 		"ON CONFLICT(name) DO NOTHING;"
 
-	if _, err := tx.Exec(query, args...); err != nil {
+	_, err := r.dbContext.ExecContext(ctx, query, args)
+	if err != nil {
 		return err
 	}
 
-	return tx.Commit()
+	return nil
 }
 
 func (r *tagRepository) UpsertNoteTags(noteID int64, tagIDs []int64) error {
@@ -54,12 +49,6 @@ func (r *tagRepository) UpsertNoteTags(noteID int64, tagIDs []int64) error {
 		return nil
 	}
 
-	tx, err := r.db.Begin()
-	if err != nil {
-		return err
-	}
-	defer tx.Rollback()
-
 	placeholders := make([]string, 0, len(tagIDs))
 	args := make([]any, 0, len(tagIDs))
 
@@ -75,9 +64,10 @@ func (r *tagRepository) UpsertNoteTags(noteID int64, tagIDs []int64) error {
 		"ON CONFLICT(note_id, tag_id) DO NOTHING" +
 		"SELECT note_id, tag_id FROM input;"
 
-	if _, err := tx.Exec(query, args...); err != nil {
+	_, err := r.dbContext.ExecContext(context.Background(), query, args)
+	if err != nil {
 		return err
 	}
 
-	return tx.Commit()
+	return nil
 }

persistence/repositories/uow.go

@@ -0,0 +1,40 @@
+package repositories
+
+import (
+	"context"
+	"database/sql"
+)
+
+type DBContext interface {
+	ExecContext(ctx context.Context, args ...any) (sql.Result, error)
+	QueryContext(ctx context.Context, args ...any) (*sql.Rows, error)
+	QueryRowContext(ctx context.Context, args ...any) *sql.Row
+}
+
+type UnitOfWork struct {
+	db *sql.DB
+}
+
+func NewUnitOfWork(db *sql.DB) *UnitOfWork {
+	return &UnitOfWork{db: db}
+}
+
+func (u *UnitOfWork) Execute(ctx context.Context, fn func(tx *sql.Tx) error) (err error) {
+	transcation, err := u.db.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		if err != nil {
+			_ = transcation.Rollback()
+		}
+	}()
+
+	if err = fn(transcation); err != nil {
+		return err
+	}
+
+	err = transcation.Commit()
+	return err
+}