Added "create list" handler, service + repository

cmd/api-server/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"database/sql"
 	"errors"
 	"fmt"
 	"log/slog"
@@ -68,7 +69,7 @@ func run(serviceName string, serviceVersion string) error {
 		}
 	}()
 
-	srv := makeServer(cfg)
+	srv := makeServer(db, cfg.Port)
 	go func() {
 		slog.Info("Starting http server", "addr", srv.Addr)
 		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
@@ -105,12 +106,14 @@ func setupLogging() {
 	slog.SetDefault(logger)
 }
 
-func makeServer(cfg *config.Config) *http.Server {
-	routerConfig := router.Config{}
+func makeServer(db *sql.DB, port int) *http.Server {
+	routerConfig := router.Config{
+		Database: db,
+	}
 	mux := router.NewMux(routerConfig)
 
 	srv := &http.Server{
-		Addr:         fmt.Sprintf(":%d", cfg.Port),
+		Addr:         fmt.Sprintf(":%d", port),
 		Handler:      mux,
 		ReadTimeout:  5 * time.Second,
 		WriteTimeout: 10 * time.Second,

internal/api/handler/list.go

@@ -0,0 +1,35 @@
+package handler
+
+import (
+	"log/slog"
+	"net/http"
+
+	"github.com/robindittmar/dttmr-api/internal/api/request"
+	"github.com/robindittmar/dttmr-api/internal/api/response"
+	"github.com/robindittmar/dttmr-api/internal/domain"
+)
+
+type ListHandler struct {
+	ListService *domain.ListService
+}
+
+func (h *ListHandler) CreateList(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+
+	payload, err := request.DecodeCreateList(r)
+	if err != nil {
+		slog.ErrorContext(ctx, "Failed to decode create list payload", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusBadRequest, "Failed to decode request body")
+		return
+	}
+
+	list, err := h.ListService.Create(ctx, payload.Name, payload.UserIDs)
+	if err != nil {
+		slog.ErrorContext(ctx, "Failed to create list", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusInternalServerError, "Failed to create list")
+		return
+	}
+
+	slog.InfoContext(ctx, "Created list successfully", slog.Any("list_id", list.ID))
+	response.JSON(ctx, w, http.StatusCreated, list)
+}

internal/api/request/list.go

@@ -0,0 +1,27 @@
+package request
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type CreateListPayload struct {
+	Name    string   `json:"name"`
+	UserIDs []string `json:"user_ids"`
+}
+
+func DecodeCreateList(r *http.Request) (CreateListPayload, error) {
+	var payload CreateListPayload
+
+	r.Body = http.MaxBytesReader(nil, r.Body, 1024*64)
+
+	decoder := json.NewDecoder(r.Body)
+	decoder.DisallowUnknownFields()
+
+	if err := decoder.Decode(&payload); err != nil {
+		return payload, fmt.Errorf("error decoding create list payload: %w", err)
+	}
+
+	return payload, nil
+}

internal/api/router/router.go

@@ -1,20 +1,32 @@
 package router
 
 import (
+	"database/sql"
 	"net/http"
 
 	"github.com/robindittmar/dttmr-api/internal/api/handler"
 	"github.com/robindittmar/dttmr-api/internal/api/middleware"
+	"github.com/robindittmar/dttmr-api/internal/domain"
+	"github.com/robindittmar/dttmr-api/internal/repository"
 )
 
-type Config struct{}
+type Config struct {
+	Database *sql.DB
+}
 
 func NewMux(cfg Config) http.Handler {
+	listRepo := repository.NewListRepo(cfg.Database)
+	listService := domain.NewListService(listRepo)
+
+	listHandler := handler.ListHandler{ListService: listService}
+
 	mux := http.NewServeMux()
 
 	mux.HandleFunc("/", handler.DefaultHandler)
 	mux.HandleFunc("GET /health", handler.HealthHandler)
 
+	mux.HandleFunc("POST /lists", listHandler.CreateList)
+
 	var httpHandler http.Handler = mux
 	httpHandler = middleware.WithTelemetry(httpHandler)
 

internal/domain/list.go

@@ -0,0 +1,37 @@
+package domain
+
+import (
+	"context"
+	"errors"
+	"time"
+)
+
+type List struct {
+	ID        string    `json:"id"`
+	Name      string    `json:"name"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+type ListRepository interface {
+	CreateList(ctx context.Context, name string, userIDs []string) (*List, error)
+}
+
+type ListService struct {
+	repo ListRepository
+}
+
+func NewListService(repo ListRepository) *ListService {
+	return &ListService{repo: repo}
+}
+
+func (s *ListService) Create(ctx context.Context, name string, userIDs []string) (*List, error) {
+	if len(userIDs) == 0 {
+		return nil, errors.New("users must have at least one associated user")
+	}
+
+	if name == "" {
+		return nil, errors.New("list name must not be empty")
+	}
+
+	return s.repo.CreateList(ctx, name, userIDs)
+}

internal/repository/list.go

@@ -0,0 +1,64 @@
+package repository
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log/slog"
+
+	"github.com/robindittmar/dttmr-api/internal/domain"
+)
+
+type ListRepo struct {
+	db *sql.DB
+}
+
+func NewListRepo(db *sql.DB) *ListRepo {
+	return &ListRepo{db: db}
+}
+
+func (r *ListRepo) CreateList(ctx context.Context, name string, userIDs []string) (*domain.List, error) {
+	tx, err := r.db.BeginTx(ctx, nil)
+	if err != nil {
+		return nil, fmt.Errorf("begin transaction: %w", err)
+	}
+	defer func() {
+		err := tx.Rollback()
+		if err != nil {
+			slog.Error("Failed to rollback transaction", slog.Any("error", err))
+		}
+	}()
+
+	list := &domain.List{Name: name}
+
+	err = tx.QueryRowContext(ctx,
+		"INSERT INTO lists (name) VALUES ($1) RETURNING id, created_at",
+		name,
+	).Scan(&list.ID, &list.CreatedAt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to insert list: %w", err)
+	}
+
+	stmt, err := tx.PrepareContext(ctx, "INSERT INTO list_users (list_id, user_id) VALUES ($1, $2)")
+	if err != nil {
+		return nil, fmt.Errorf("failed to prepare user/list association statement: %w", err)
+	}
+	defer func() {
+		err := stmt.Close()
+		if err != nil {
+
+		}
+	}()
+
+	for _, userID := range userIDs {
+		if _, err = stmt.ExecContext(ctx, list.ID, userID); err != nil {
+			return nil, fmt.Errorf("failed to insert user/list association: %w", err)
+		}
+	}
+
+	if err := tx.Commit(); err != nil {
+		return nil, fmt.Errorf("commit transaction: %w", err)
+	}
+
+	return list, err
+}