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
Transaction entity and DB Handle
2024-02-13 19:27:26 +00:00 · 2024-02-06 19:44:52 +00:00 · 2024-02-06 19:43:42 +00:00 · 2024-02-06 19:41:21 +00:00 · 2024-02-05 23:52:26 +00:00
8 changed files with 551 additions and 0 deletions
--- a/cmd/api-server/main.go
+++ b/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))
+}
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@ -0,0 +1,160 @@
+openapi: 3.0.3
+info:
+  title: Personal Finance - OpenAPI 3.0
+  description: |
+    Personal Finance Server
+  contact:
+    email: finance@murta.dev
+  license:
+    name: GNU General Public License v3.0 or later
+    url: https://www.gnu.org/licenses/gpl-3.0-standalone.html
+  version: 0.0.1
+
+paths:
+  /transactions:
+    get:
+      summary: Retrieve existing transactions
+      operationId: retrieveTransactions
+      parameters:
+        - name: limit
+          in: query
+          description: number of transactions to return
+          schema:
+            type: integer
+            format: int32
+            default: 100
+            minimum: 0
+        - name: offset
+          in: query
+          description: offset from where to retrieve transactions
+          schema:
+            type: integer
+            format: int32
+            default: -1
+        - name: bank
+          in: query
+          description: ID of the bank
+          schema:
+            type: string
+        - name: sort
+          in: query
+          description: field name by which to sort
+          schema:
+            type: string
+      responses:
+        "200":
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Transactions"
+        "404":
+          description: No transactions
+
+  /transactions/{transactionId}:
+    get:
+      summary: Find transaction by ID
+      operationId: retrieveTransactions
+      parameters:
+        - name: transactionId
+          in: path
+          description: ID of transaction to return
+          required: true
+          schema:
+            type: integer
+            format: int64
+      responses:
+        "200":
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Transaction"
+        "400":
+          description: Invalid ID supplied
+        "404":
+          description: Transaction not found
+
+  /banks:
+    get:
+      summary: Retrieve existing banks
+      operationId: retrieveBanks
+      responses:
+        "200":
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Banks"
+        "404":
+          description: No banks
+
+  /banks/{bankId}:
+    get:
+      summary: Find bank by ID
+      operationId: retrieveBank
+      parameters:
+        - name: bankId
+          in: path
+          description: ID of bank to return
+          required: true
+          schema:
+            type: integer
+            format: int64
+      responses:
+        "200":
+          description: Successful operation
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Bank"
+        "400":
+          description: Invalid ID supplied
+        "404":
+          description: Bank not found
+
+components:
+  schemas:
+    Transaction:
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+          minimum: 0
+        date:
+          type: string
+          format: date
+        description:
+          type: string
+        value:
+          type: number
+          format: float
+        category:
+          type: string
+      required:
+        - id
+        - date
+        - description
+        - value
+    Transactions:
+      type: array
+      items:
+        $ref: "#/components/schemas/Transaction"
+    Bank:
+      type: object
+      properties:
+        id:
+          type: string
+        name:
+          type: string
+        nordigenId:
+          type: string
+          format: uuid
+      required:
+        - id
+        - name
+    Banks:
+      type: array
+      items:
+        $ref: "#/components/schemas/Bank"
--- a/go.mod
+++ b/go.mod
@ -1,3 +1,40 @@
 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 // indirect
+	github.com/bytedance/sonic v1.9.1 // indirect
+	github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.2 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.14.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgx/v5 v5.5.3 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/mattn/go-isatty v0.0.19 // 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/net v0.10.0 // 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
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,101 @@
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+github.com/bytedance/sonic v1.9.1 h1:6iJ6NqdoxCDr6mbY8h18oSO+cShGSMRGCEo7F2h0x8s=
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--- a/internal/dal/dal.go
+++ b/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
+}
--- a/internal/dal/dal_test.go
+++ b/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)
+	}
+}
--- a/internal/entities/credentials.go
+++ b/internal/entities/credentials.go
@ -0,0 +1,5 @@
+package entities
+
+type Credentials struct {
+	Database string
+}
--- a/internal/entities/entities.go
+++ b/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
+}
Author	SHA1	Message	Date
Luís Murta	19974a5f44	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	2024-02-13 19:27:26 +00:00
Luís Murta	a7359aacea	Transaction entity and DB Handle This patch introduces the Transaction entity. It also creates a placeholder Handle type with a Transactions method as a placeholder for the future DB adaptation. Incorporates the new types into the retriveTransactions HTTP handler.	2024-02-06 19:44:52 +00:00
Luís Murta	771e4cad0c	Specify resources required attributes	2024-02-06 19:43:42 +00:00
Luís Murta	eca17d0262	Generated ChatGPT template HTTP server Issue #4	2024-02-06 19:41:21 +00:00
Luís Murta	81c8f1a601	OpenAPI spec including transactions and banks	2024-02-05 23:52:26 +00:00