Sending invoice from the BE

cmd/web/handlers.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
 	"fmt"
 	"myapp/internal/cards"
 	"myapp/internal/cards/encryption"
@@ -8,6 +10,7 @@ import (
 	"myapp/internal/urlsigner"
 	"net/http"
 	"strconv"
+	"time"
 
 	"github.com/go-chi/chi/v5"
 )
@@ -95,6 +98,17 @@ func (app *application) GetTransactionData(r *http.Request) (TransactionData, er
 	return txnData, nil
 }
 
+type Invoice struct {
+	ID        int       `json:"id"`
+	Quantity  int       `json:"quantity"`
+	Amount    int       `json:"amount"`
+	Product   string    `json:"product"`
+	FirstName string    `json:"first_name"`
+	LastName  string    `json:"last_name"`
+	Email     string    `json:"email"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
 func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request) {
 	// read posted data
 	err := r.ParseForm()
@@ -150,6 +164,24 @@ func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request)
 		app.errorLog.Println(err)
 		return
 	}
+	// call microservice
+	inv := Invoice{
+		ID:        orderID,
+		Quantity:  order.Quantity,
+		Amount:    order.Amount,
+		Product:   "Widget",
+		FirstName: txnData.FirstName,
+		LastName:  txnData.LastName,
+		Email:     txnData.Email,
+		CreatedAt: time.Now(),
+	}
+
+	err = app.callInvoiceMicro(inv)
+	if err != nil {
+		app.errorLog.Println(err)
+		// Don't stop the program
+	}
+
 	app.infoLog.Printf("order id: %d", orderID)
 
 	app.Session.Put(r.Context(), "txn", txnData)
@@ -157,6 +189,30 @@ func (app *application) PaymentSucceeded(w http.ResponseWriter, r *http.Request)
 	http.Redirect(w, r, "/receipt", http.StatusSeeOther)
 }
 
+func (app *application) callInvoiceMicro(inv Invoice) error {
+	// TODO: Do not hard code this.
+	url := "http://localhost:5000/invoice/create-and-send"
+	out, err := json.MarshalIndent(inv, "", "\t")
+	if err != err {
+		return err
+	}
+
+	req, err := http.NewRequest("POST", url, bytes.NewBuffer(out))
+	if err != nil {
+		return nil
+	}
+	req.Header.Set("Content-Type", "application/json")
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	app.infoLog.Println(resp.Body)
+
+	return nil
+}
+
 func (app *application) VirtualTerminalPaymentSucceeded(w http.ResponseWriter, r *http.Request) {
 	txnData, err := app.GetTransactionData(r)
 	if err != nil {