Working /transactions endpoint with DB connection

Adds the database abstraction layer (DAL) with a Transactions method
and a Connection object to encapsulate the DB open connection.
Includes a DAL unit test using the go-sqlmock library.

Connection to a PostgreSQL database using environment variables to
store the secrets.

Overall, with the /transactions endpoint requesting directly to the DB,
this patch finish the tracer bullet project.

Issues #1, #5, #6 and #7

cmd/api-server/main.go

@@ -0,0 +1,130 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"git.rosemyrtle.work/personal-finance/server/internal/dal"
+	"git.rosemyrtle.work/personal-finance/server/internal/entities"
+
+	"github.com/gin-gonic/gin"
+	"github.com/joho/godotenv"
+	"github.com/shopspring/decimal"
+)
+
+// Transaction struct represents a transaction
+type Transaction struct {
+	Id          int64   `json:"id"`
+	Date        string  `json:"date"`
+	Description string  `json:"description"`
+	Value       float64 `json:"value"`
+	Category    string  `json:"category,omitempty"`
+}
+
+// Bank struct represents a bank
+type Bank struct {
+	ID         string `json:"id"`
+	Name       string `json:"name"`
+	NordigenID string `json:"nordigenId,omitempty"`
+}
+
+type Env struct {
+	db *dal.Connection
+}
+
+func (e *Env) retrieveTransactions(c *gin.Context) {
+	// Handle the logic for retrieving transactions here
+	// limit := c.Query("limit")
+	// offset := c.Query("offset")
+	// bank := c.Query("bank")
+	// sort := c.Query("sort")
+
+	transactions := e.db.Transactions()
+	var ret []Transaction
+
+	for _, t := range transactions {
+		year, month, day := t.Date.Date()
+		var b strings.Builder
+		fmt.Fprintf(&b, "%d-%d-%d", year, month, day)
+		ret = append(ret, Transaction{t.Id, b.String(), t.Description, t.Value.InexactFloat64(), t.Category})
+	}
+
+	c.JSON(http.StatusOK, ret)
+}
+
+func (e *Env) retrieveTransactionByID(c *gin.Context) {
+	// Handle the logic for retrieving a transaction by ID here
+	// transactionID := c.Param("transactionId")
+
+	// Placeholder response
+	transaction := entities.Transaction{
+		Id:          1,
+		Date:        time.Date(2024, 01, 24, 0, 0, 0, 0, time.UTC),
+		Description: "Groceries",
+		Value:       decimal.NewFromFloat(-50.0),
+		Category:    "Food",
+	}
+
+	c.JSON(http.StatusOK, transaction)
+}
+
+func (e *Env) retrieveBanks(c *gin.Context) {
+	// Handle the logic for retrieving banks here
+
+	// Placeholder response
+	banks := []Bank{
+		{ID: "1", Name: "Bank A", NordigenID: "uuid1"},
+		{ID: "2", Name: "Bank B", NordigenID: "uuid2"},
+	}
+
+	c.JSON(http.StatusOK, banks)
+}
+
+func (e *Env) retrieveBankByID(c *gin.Context) {
+	// Handle the logic for retrieving a bank by ID here
+	bankID := c.Param("bankId")
+
+	// Placeholder response
+	bank := Bank{ID: bankID, Name: "Bank A", NordigenID: "uuid1"}
+
+	c.JSON(http.StatusOK, bank)
+}
+
+func main() {
+	if err := godotenv.Load(); err != nil {
+		log.Fatal("Error loading .env file")
+		return
+	}
+
+	user := os.Getenv("PG_USER")
+	pass := os.Getenv("PG_PASSWORD")
+	location := os.Getenv("PG_URL")
+	database := os.Getenv("PG_DB")
+
+	credentials := entities.Credentials{Database: "postgres://" + user + ":" + pass + "@" + location + "/" + database}
+	db, err := dal.Open(&credentials)
+	if err != nil {
+		log.Fatal(err)
+		return
+	}
+	defer db.Close()
+
+	router := gin.Default()
+
+	env := Env{db: db}
+
+	// Routes
+	router.GET("/transactions", env.retrieveTransactions)
+	router.GET("/transactions/:transactionId", env.retrieveTransactionByID)
+	router.GET("/banks", env.retrieveBanks)
+	router.GET("/banks/:bankId", env.retrieveBankByID)
+
+	// Start server
+	port := 8080
+	fmt.Printf("Server is running on :%d...\n", port)
+	router.Run(fmt.Sprintf(":%d", port))
+}

docs/openapi.yaml

@@ -14,14 +14,8 @@ paths:
   /transactions:
     get:
       summary: Retrieve existing transactions
-      operationId: getTransactions
+      operationId: retrieveTransactions
       parameters:
-        - name: category
-          in: query
-          description: filter by transaction category
-          schema:
-            type: string
-            nullable: true
         - name: limit
           in: query
           description: number of transactions to return
@@ -60,7 +54,7 @@ paths:
   /transactions/{transactionId}:
     get:
       summary: Find transaction by ID
-      operationId: getTransactionsById
+      operationId: retrieveTransactions
       parameters:
         - name: transactionId
           in: path
@@ -84,7 +78,7 @@ paths:
   /banks:
     get:
       summary: Retrieve existing banks
-      operationId: getBanks
+      operationId: retrieveBanks
       responses:
         "200":
           description: Successful operation
@@ -98,7 +92,7 @@ paths:
   /banks/{bankId}:
     get:
       summary: Find bank by ID
-      operationId: getBanksById
+      operationId: retrieveBank
       parameters:
         - name: bankId
           in: path

go.mod

@@ -2,32 +2,39 @@ module git.rosemyrtle.work/personal-finance/server
 
 go 1.21.1
 
+require github.com/gin-gonic/gin v1.9.1
+
 require (
-	github.com/DATA-DOG/go-sqlmock v1.5.2
+	github.com/DATA-DOG/go-sqlmock v1.5.2 // indirect
-	github.com/apapsch/go-jsonmerge/v2 v2.0.0 // indirect
+	github.com/bytedance/sonic v1.9.1 // indirect
-	github.com/deepmap/oapi-codegen/v2 v2.1.0 // indirect
+	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
-	github.com/getkin/kin-openapi v0.123.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.2 // indirect
-	github.com/go-openapi/jsonpointer v0.20.2 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
-	github.com/go-openapi/swag v0.22.8 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
-	github.com/google/uuid v1.5.0 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/invopop/yaml v0.2.0 // indirect
+	github.com/go-playground/validator/v10 v10.14.0 // indirect
-	github.com/josharian/intern v1.0.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
-	github.com/labstack/echo/v4 v4.11.4 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/labstack/gommon v0.4.2 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
-	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/jackc/pgx/v5 v5.5.3 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
-	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/oapi-codegen/runtime v1.1.1 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
-	github.com/perimeterx/marshmallow v1.1.5 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
-	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
-	github.com/valyala/fasttemplate v1.2.2 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+	github.com/shopspring/decimal v1.3.1 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.11 // indirect
+	golang.org/x/arch v0.3.0 // indirect
 	golang.org/x/crypto v0.17.0 // indirect
-	golang.org/x/mod v0.12.0 // indirect
+	golang.org/x/net v0.10.0 // indirect
-	golang.org/x/net v0.19.0 // indirect
+	golang.org/x/sync v0.1.0 // indirect
 	golang.org/x/sys v0.15.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/tools v0.12.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,68 +1,101 @@
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internal/api/converter.go

@@ -1,34 +0,0 @@
-package api
-
-import (
-	"database/sql"
-	"log"
-	"reflect"
-)
-
-func convert[T any](rows *sql.Rows) []T {
-	var ans []T
-	for rows.Next() {
-		var r T
-		s := reflect.ValueOf(&r).Elem()
-		log.Println(s)
-
-		numCols := s.NumField()
-		columns := make([]interface{}, numCols)
-		log.Println(columns)
-
-		for i := 0; i < numCols; i++ {
-			field := s.Field(i)
-			log.Println(field)
-			columns[i] = field.Addr().Interface()
-		}
-		log.Println(columns)
-
-		if err := rows.Scan(columns...); err != nil {
-			log.Fatal(err)
-		}
-
-		ans = append(ans, r)
-	}
-	return ans
-}

internal/api/impl.go

@@ -1,36 +0,0 @@
-package api
-
-//go:generate go run github.com/deepmap/oapi-codegen/v2/cmd/oapi-codegen --config=api.cfg.yaml ../../docs/openapi.yaml
-
-import (
-	"database/sql"
-	"log"
-	"net/http"
-
-	"github.com/labstack/echo/v4"
-)
-
-type ServerImpl struct {
-	db *sql.DB
-}
-
-func (*ServerImpl) GetBanks(ctx echo.Context) error {
-	return echo.NewHTTPError(http.StatusNotImplemented)
-}
-
-func (*ServerImpl) GetBanksById(ctx echo.Context, bankId int64) error {
-	return echo.NewHTTPError(http.StatusNotImplemented)
-}
-
-func (pf *ServerImpl) GetTransactions(ctx echo.Context, params GetTransactionsParams) error {
-	rows, err := pf.db.Query("SELECT t.category, t.date, t.description, t.id, tc.amount FROM pfbudget.transactions t LEFT JOIN pfbudget.transactions_categorized tc ON t.id = tc.id")
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	return ctx.JSON(http.StatusOK, convert[Transaction](rows))
-}
-
-func (*ServerImpl) GetTransactionsById(ctx echo.Context, transactionId int64) error {
-	return echo.NewHTTPError(http.StatusNotImplemented)
-}

internal/api/impl_test.go

@@ -1,65 +0,0 @@
-package api
-
-import (
-	"log"
-	"net/http"
-	"net/http/httptest"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/DATA-DOG/go-sqlmock"
-	"github.com/labstack/echo/v4"
-)
-
-func TestGetTransactions(t *testing.T) {
-	db, mock, err := sqlmock.New()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	e := echo.New()
-	handlers := ServerImpl{db}
-	RegisterHandlers(e, &handlers)
-
-	t.Run("when successful", func(t *testing.T) {
-		rec := httptest.NewRecorder()
-		req := httptest.NewRequest(http.MethodGet, "/transactions", nil)
-
-		date := time.Now()
-		rows := mock.NewRows([]string{"category", "date", "description", "id", "amount"}).
-			AddRow(nil, date, "#1", 1, 1000).
-			AddRow("expense", date, "#2", 2, -1000)
-		mock.ExpectQuery("SELECT t.category, t.date, t.description, t.id, tc.amount FROM pfbudget.transactions t LEFT JOIN pfbudget.transactions_categorized tc ON t.id = tc.id").WillReturnRows(rows)
-
-		ctx := e.NewContext(req, rec)
-		err := handlers.GetTransactions(ctx, GetTransactionsParams{})
-		if err != nil {
-			t.Error(err)
-		}
-		if rec.Code != http.StatusOK {
-			t.Error(rec.Code)
-		}
-
-		expected := `[
-			{
-				"date":"` + date.Format(time.DateOnly) + `",
-				"description": "#1",
-				"id":1,
-				"value":1000
-			},
-			{
-				"category": "expense",
-				"date":"` + date.Format(time.DateOnly) + `",
-				"description": "#2",
-				"id":2,
-				"value":-1000
-			}
-		]`
-		expected = strings.Join(strings.Fields(expected), "")
-		log.Println(expected)
-		if ret := strings.TrimRight(rec.Body.String(), "\n"); ret != expected {
-			t.Error(ret, expected)
-		}
-	})
-}

internal/api/server.gen.go

@@ -1,312 +0,0 @@
-// Package api provides primitives to interact with the openapi HTTP API.
-//
-// Code generated by github.com/deepmap/oapi-codegen/v2 version v2.1.0 DO NOT EDIT.
-package api
-
-import (
-	"bytes"
-	"compress/gzip"
-	"encoding/base64"
-	"errors"
-	"fmt"
-	"net/http"
-	"net/url"
-	"path"
-	"strings"
-	"time"
-
-	"github.com/getkin/kin-openapi/openapi3"
-	"github.com/labstack/echo/v4"
-	"github.com/oapi-codegen/runtime"
-	openapi_types "github.com/oapi-codegen/runtime/types"
-)
-
-// Bank defines model for Bank.
-type Bank struct {
-	Id         string              `json:"id"`
-	Name       string              `json:"name"`
-	NordigenId *openapi_types.UUID `json:"nordigenId,omitempty"`
-}
-
-// Banks defines model for Banks.
-type Banks = []Bank
-
-// Manually added date time that implements the Scanner interface
-type ScannableDate struct {
-	openapi_types.Date
-}
-
-func (d *ScannableDate) Scan(src any) error {
-	switch s := src.(type) {
-	case time.Time:
-		d.Time = s
-		return nil
-	}
-
-	return errors.New("column is not convertible to date")
-}
-
-// Transaction defines model for Transaction.
-type Transaction struct {
-	Category    *string            `json:"category,omitempty"`
-	Date        ScannableDate      `json:"date"`
-	Description string             `json:"description"`
-	Id          int64              `json:"id"`
-	Value       float32            `json:"value"`
-}
-
-// Transactions defines model for Transactions.
-type Transactions = []Transaction
-
-// GetTransactionsParams defines parameters for GetTransactions.
-type GetTransactionsParams struct {
-	// Category filter by transaction category
-	Category *string `form:"category,omitempty" json:"category,omitempty"`
-
-	// Limit number of transactions to return
-	Limit *int32 `form:"limit,omitempty" json:"limit,omitempty"`
-
-	// Offset offset from where to retrieve transactions
-	Offset *int32 `form:"offset,omitempty" json:"offset,omitempty"`
-
-	// Bank ID of the bank
-	Bank *string `form:"bank,omitempty" json:"bank,omitempty"`
-
-	// Sort field name by which to sort
-	Sort *string `form:"sort,omitempty" json:"sort,omitempty"`
-}
-
-// ServerInterface represents all server handlers.
-type ServerInterface interface {
-	// Retrieve existing banks
-	// (GET /banks)
-	GetBanks(ctx echo.Context) error
-	// Find bank by ID
-	// (GET /banks/{bankId})
-	GetBanksById(ctx echo.Context, bankId int64) error
-	// Retrieve existing transactions
-	// (GET /transactions)
-	GetTransactions(ctx echo.Context, params GetTransactionsParams) error
-	// Find transaction by ID
-	// (GET /transactions/{transactionId})
-	GetTransactionsById(ctx echo.Context, transactionId int64) error
-}
-
-// ServerInterfaceWrapper converts echo contexts to parameters.
-type ServerInterfaceWrapper struct {
-	Handler ServerInterface
-}
-
-// GetBanks converts echo context to params.
-func (w *ServerInterfaceWrapper) GetBanks(ctx echo.Context) error {
-	var err error
-
-	// Invoke the callback with all the unmarshaled arguments
-	err = w.Handler.GetBanks(ctx)
-	return err
-}
-
-// GetBanksById converts echo context to params.
-func (w *ServerInterfaceWrapper) GetBanksById(ctx echo.Context) error {
-	var err error
-	// ------------- Path parameter "bankId" -------------
-	var bankId int64
-
-	err = runtime.BindStyledParameterWithOptions("simple", "bankId", ctx.Param("bankId"), &bankId, runtime.BindStyledParameterOptions{ParamLocation: runtime.ParamLocationPath, Explode: false, Required: true})
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter bankId: %s", err))
-	}
-
-	// Invoke the callback with all the unmarshaled arguments
-	err = w.Handler.GetBanksById(ctx, bankId)
-	return err
-}
-
-// GetTransactions converts echo context to params.
-func (w *ServerInterfaceWrapper) GetTransactions(ctx echo.Context) error {
-	var err error
-
-	// Parameter object where we will unmarshal all parameters from the context
-	var params GetTransactionsParams
-	// ------------- Optional query parameter "category" -------------
-
-	err = runtime.BindQueryParameter("form", true, false, "category", ctx.QueryParams(), &params.Category)
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter category: %s", err))
-	}
-
-	// ------------- Optional query parameter "limit" -------------
-
-	err = runtime.BindQueryParameter("form", true, false, "limit", ctx.QueryParams(), &params.Limit)
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter limit: %s", err))
-	}
-
-	// ------------- Optional query parameter "offset" -------------
-
-	err = runtime.BindQueryParameter("form", true, false, "offset", ctx.QueryParams(), &params.Offset)
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter offset: %s", err))
-	}
-
-	// ------------- Optional query parameter "bank" -------------
-
-	err = runtime.BindQueryParameter("form", true, false, "bank", ctx.QueryParams(), &params.Bank)
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter bank: %s", err))
-	}
-
-	// ------------- Optional query parameter "sort" -------------
-
-	err = runtime.BindQueryParameter("form", true, false, "sort", ctx.QueryParams(), &params.Sort)
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter sort: %s", err))
-	}
-
-	// Invoke the callback with all the unmarshaled arguments
-	err = w.Handler.GetTransactions(ctx, params)
-	return err
-}
-
-// GetTransactionsById converts echo context to params.
-func (w *ServerInterfaceWrapper) GetTransactionsById(ctx echo.Context) error {
-	var err error
-	// ------------- Path parameter "transactionId" -------------
-	var transactionId int64
-
-	err = runtime.BindStyledParameterWithOptions("simple", "transactionId", ctx.Param("transactionId"), &transactionId, runtime.BindStyledParameterOptions{ParamLocation: runtime.ParamLocationPath, Explode: false, Required: true})
-	if err != nil {
-		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Invalid format for parameter transactionId: %s", err))
-	}
-
-	// Invoke the callback with all the unmarshaled arguments
-	err = w.Handler.GetTransactionsById(ctx, transactionId)
-	return err
-}
-
-// This is a simple interface which specifies echo.Route addition functions which
-// are present on both echo.Echo and echo.Group, since we want to allow using
-// either of them for path registration
-type EchoRouter interface {
-	CONNECT(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	DELETE(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	GET(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	HEAD(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	OPTIONS(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	PATCH(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	POST(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	PUT(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-	TRACE(path string, h echo.HandlerFunc, m ...echo.MiddlewareFunc) *echo.Route
-}
-
-// RegisterHandlers adds each server route to the EchoRouter.
-func RegisterHandlers(router EchoRouter, si ServerInterface) {
-	RegisterHandlersWithBaseURL(router, si, "")
-}
-
-// Registers handlers, and prepends BaseURL to the paths, so that the paths
-// can be served under a prefix.
-func RegisterHandlersWithBaseURL(router EchoRouter, si ServerInterface, baseURL string) {
-
-	wrapper := ServerInterfaceWrapper{
-		Handler: si,
-	}
-
-	router.GET(baseURL+"/banks", wrapper.GetBanks)
-	router.GET(baseURL+"/banks/:bankId", wrapper.GetBanksById)
-	router.GET(baseURL+"/transactions", wrapper.GetTransactions)
-	router.GET(baseURL+"/transactions/:transactionId", wrapper.GetTransactionsById)
-
-}
-
-// Base64 encoded, gzipped, json marshaled Swagger object
-var swaggerSpec = []string{
-
-	"H4sIAAAAAAAC/8xWX2/bNhD/KgS3R0VS6mAPetqKoIGBoQvW7anrAy2dZHb8o5JHZ0bg7z4cKTuSJdcZ",
-	"sA57iSXzePf7c3fOM6+t7q0Bg55Xz9zXW9AiPr4V5k/67J3twaGE+K1s6C/ue+AV9+ik6fgh40ZoWD6w",
-	"rpEdmHW811qnBfKKhyAbnp2HHzLu4EuQDhpefeQxJGb+dAq1m89QI2UmfAkSgo4P3ztoecW/K144FQOh",
-	"IrI5nNII58Se3n9zwnhRo7RmTrYWCJ11+0VmjUCYcIpfZAuB4Gsn+2OJ2bmcSiMN/nDHM66lkTpoXpWn",
-	"nNIgdODo0k6oMC3fKivwpb4JekOhS5oOSMfAjhmXlB5p9HrBx8LOdCdU0rQ2imwNihrpEbSQiqhII0wN",
-	"P+rgUOQN7GYy8kdw3hqh2LsUyz6A24H7g5goWYPxUZ3Ul/zh/e/sAQw4odhj2ChZs59TENut8pJZx5RA",
-	"cDzjwRGCLWLvq6J4enrKOxNy67piSOuLrlc3q7y88ShMI5Q1kG9Rq0hTooIleDfslx7MT49rtspLUhuc",
-	"T0zKvMxv6a7twYhe8oqv8jJf8Yz3ArdR6GJzbPYOolLUpYKkoLniD4BpGshr31tCSVFvyvKoMJh4T/S9",
-	"knW8WXz2qSGTY68ZIJ+cmzrxIdQ1eN8GxU6oiM5deUc5p8HvLdsMiTLug9aCpov/Cugk7IDBX9KjNN0o",
-	"KnEvnulj3RyuivB2v26idk5oQHCeVx/PYazvmW1jDYaWOcDgqHEknZHox71T8VSVj4cIXYBspNpscs+n",
-	"9fDpG/vyz2wp57aszU4o2bD1PfOBoEBz0UIqyIxF1tpgmjMj30nTJF03e7a+Twbi2f64ZN9kz1xxsJUK",
-	"wVGVUXZ2WtiDl18CxJfBzNHxi7gmKCU2NLXJ2Nlv0nnptFmpgcbE5o10VlxJLXFSuYFWBIW8ui3LbNJG",
-	"qzdXfgDmqGzbekDWOqvZ0xYcDIDSXOFU2iV8KcEywJvbBXzXMaUxwy3ElrhQdzh6qXrVgFaCahhdJ/+f",
-	"trLeEllvHV6oMRxdrvEtJ3TS1v/CAsVpvq/v0VnwZBqL59HbleU6pvH6HTueziurdgLlf7xxJ//Z/IeL",
-	"d1T36/t3rPlxDR8OfwcAAP//XTQsSusLAAA=",
-}
-
-// GetSwagger returns the content of the embedded swagger specification file
-// or error if failed to decode
-func decodeSpec() ([]byte, error) {
-	zipped, err := base64.StdEncoding.DecodeString(strings.Join(swaggerSpec, ""))
-	if err != nil {
-		return nil, fmt.Errorf("error base64 decoding spec: %w", err)
-	}
-	zr, err := gzip.NewReader(bytes.NewReader(zipped))
-	if err != nil {
-		return nil, fmt.Errorf("error decompressing spec: %w", err)
-	}
-	var buf bytes.Buffer
-	_, err = buf.ReadFrom(zr)
-	if err != nil {
-		return nil, fmt.Errorf("error decompressing spec: %w", err)
-	}
-
-	return buf.Bytes(), nil
-}
-
-var rawSpec = decodeSpecCached()
-
-// a naive cached of a decoded swagger spec
-func decodeSpecCached() func() ([]byte, error) {
-	data, err := decodeSpec()
-	return func() ([]byte, error) {
-		return data, err
-	}
-}
-
-// Constructs a synthetic filesystem for resolving external references when loading openapi specifications.
-func PathToRawSpec(pathToFile string) map[string]func() ([]byte, error) {
-	res := make(map[string]func() ([]byte, error))
-	if len(pathToFile) > 0 {
-		res[pathToFile] = rawSpec
-	}
-
-	return res
-}
-
-// GetSwagger returns the Swagger specification corresponding to the generated code
-// in this file. The external references of Swagger specification are resolved.
-// The logic of resolving external references is tightly connected to "import-mapping" feature.
-// Externally referenced files must be embedded in the corresponding golang packages.
-// Urls can be supported but this task was out of the scope.
-func GetSwagger() (swagger *openapi3.T, err error) {
-	resolvePath := PathToRawSpec("")
-
-	loader := openapi3.NewLoader()
-	loader.IsExternalRefsAllowed = true
-	loader.ReadFromURIFunc = func(loader *openapi3.Loader, url *url.URL) ([]byte, error) {
-		pathToFile := url.String()
-		pathToFile = path.Clean(pathToFile)
-		getSpec, ok := resolvePath[pathToFile]
-		if !ok {
-			err1 := fmt.Errorf("path not found: %s", pathToFile)
-			return nil, err1
-		}
-		return getSpec()
-	}
-	var specData []byte
-	specData, err = rawSpec()
-	if err != nil {
-		return
-	}
-	swagger, err = loader.LoadFromData(specData)
-	if err != nil {
-		return
-	}
-	return
-}

internal/dal/dal.go

@@ -0,0 +1,60 @@
+package dal
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+
+	"git.rosemyrtle.work/personal-finance/server/internal/entities"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+)
+
+type Connection struct {
+	db *sql.DB
+}
+
+func Open(credentials *entities.Credentials) (*Connection, error) {
+	if credentials == nil {
+		return nil, errors.New("missing credentials")
+	}
+
+	db, err := sql.Open("pgx", credentials.Database)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to connect to database: %v\n", err)
+		return nil, err
+	}
+
+	if err := db.Ping(); err != nil {
+		log.Fatal(err)
+	}
+
+	return &Connection{db}, nil
+}
+
+func (c *Connection) Close() {
+	c.db.Close()
+}
+
+func (conn *Connection) Transactions() []entities.Transaction {
+	q := "SELECT t.date, t.description, t.amount FROM transactions t;"
+
+	rows, err := conn.db.Query(q)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var result []entities.Transaction
+
+	for rows.Next() {
+		var t entities.Transaction
+		if err := rows.Scan(&t.Date, &t.Description, &t.Value); err != nil {
+			log.Fatal(err)
+		}
+		result = append(result, t)
+	}
+
+	return result
+}

internal/dal/dal_test.go

@@ -0,0 +1,43 @@
+package dal
+
+import (
+	"database/sql/driver"
+	"testing"
+	"time"
+
+	"github.com/DATA-DOG/go-sqlmock"
+)
+
+type AnyTime struct{}
+
+func (t AnyTime) Match(v driver.Value) bool {
+	_, ok := v.(time.Time)
+	return ok
+}
+
+// type AnyDecimal struct{}
+
+func TestTransactions(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	if err != nil {
+		t.Fatalf("failed to create a mock DB: %s", err)
+	}
+	defer db.Close()
+
+	conn := Connection{db}
+
+	rows := sqlmock.NewRows([]string{"date", "description", "amount"}).
+		AddRow(time.Now(), "income", 1000).
+		AddRow(time.Now(), "expense", -500)
+
+	mock.ExpectQuery("SELECT t.date, t.description, t.amount").WithoutArgs().WillReturnRows(rows)
+
+	transactions := conn.Transactions()
+	if len(transactions) <= 0 {
+		t.Error("No transactions returned")
+	}
+
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Errorf("unfulfilled expectations: %s", err)
+	}
+}

internal/entities/credentials.go

@@ -0,0 +1,5 @@
+package entities
+
+type Credentials struct {
+	Database string
+}

internal/entities/entities.go

@@ -0,0 +1,15 @@
+package entities
+
+import (
+	"time"
+
+	"github.com/shopspring/decimal"
+)
+
+type Transaction struct {
+	Id          int64
+	Date        time.Time
+	Description string
+	Value       decimal.Decimal
+	Category    string
+}