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api/helpers/database/database.go

@@ -0,0 +1,62 @@
+package database
+
+import (
+	"api/libs/logger"
+	"api/libs/postgres"
+	"api/models/users"
+	"context"
+	"os"
+	"time"
+
+	"github.com/alexedwards/argon2id"
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5"
+)
+
+func Init() {
+
+	ensureTableUsers()
+	ensureTableProducts()
+
+	usersRepository := users.New(postgres.Pool)
+
+	var ctx = context.Background()
+
+	hash, err := argon2id.CreateHash("admin", argon2id.DefaultParams)
+	if err != nil {
+		logger.Production.Error("error generate password hash")
+	}
+
+	_, err = usersRepository.GetUser(ctx, "admin")
+	if err != nil {
+		if err.Error() == pgx.ErrNoRows.Error() {
+			usersRepository.CreateUser(ctx, users.CreateUserParams{
+				User:      uuid.New().String(),
+				CreatedAt: uint64(time.Now().Unix()),
+				Username:  "admin",
+				Password:  hash,
+			})
+			logger.Production.Info("Create user admin into database")
+		} else {
+			logger.Production.Error(err.Error())
+			os.Exit(1)
+		}
+	}
+
+}
+
+func ensureTableUsers() {
+	if _, err := postgres.Pool.Exec(context.Background(), CreateUsersTableIfNotExists); err != nil {
+		logger.Production.Error(err.Error())
+		os.Exit(1)
+	}
+	logger.Production.Info("users exists")
+}
+
+func ensureTableProducts() {
+	if _, err := postgres.Pool.Exec(context.Background(), CreateProductsTableIfNotExists); err != nil {
+		logger.Production.Error(err.Error())
+		os.Exit(1)
+	}
+	logger.Production.Info("products exists")
+}

api/helpers/database/queries.go

@@ -0,0 +1,29 @@
+package database
+
+var CreateUsersTableIfNotExists = `
+CREATE TABLE IF NOT EXISTS users (
+    "user" UUID NOT NULL,
+    created_at BIGINT NOT NULL,
+	updated_at BIGINT,
+    username text NOT NULL,
+    "password" text NOT NULL,
+	PRIMARY KEY ("user")
+)`
+
+var CreateProductsTableIfNotExists = `
+CREATE TABLE IF NOT EXISTS products (
+	created_by UUID NOT NULL,
+    created_at BIGINT NOT NULL,
+	updated_by UUID,
+	updated_at BIGINT,
+
+    nome text NOT NULL,
+    codigo text NOT NULL,
+    estoque_total BIGINT NOT NULL,
+    estoque_corte BIGINT NOT NULL,
+    estoque_disponivel BIGINT NOT NULL,
+    preco_de NUMERIC NOT NULL,
+    preco_por NUMERIC NOT NULL,
+
+	PRIMARY KEY (codigo)
+)`

api/helpers/variable/variable.go

@@ -0,0 +1,22 @@
+package variable
+
+import (
+	"log"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+// use godot package to load/read the .env file and
+// return the value of the key
+func GetEnvVariable(key string) string {
+
+	// load .env file
+	err := godotenv.Load(".env")
+
+	if err != nil {
+		log.Fatalf("Error loading .env file")
+	}
+
+	return os.Getenv(key)
+}