Mail api for sending order confirmation to planetposen customers

server/handler/confirmation.go

@@ -0,0 +1,55 @@
+// Package handler contains handlers for events.
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/kevinmidboe/planetposen-mail/client/sendgrid"
+	"github.com/kevinmidboe/planetposen-mail/mail"
+	"net/http"
+)
+
+func SendOrderConfirmation(s *sendgrid.Client) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		payload, err := getOrderConfirmationPayload(r)
+
+		if err != nil {
+			handleError(w, err, "unable to parse order payload", http.StatusBadRequest, true)
+			return
+		}
+		mailData, err := mail.OrderConfirmation(*payload)
+
+		err = s.SendOrderConfirmation(ctx, *mailData)
+		if err != nil {
+			fmt.Println(err)
+			handleError(w, err, "error from sendgrid ", http.StatusInternalServerError, true)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		responseJSON, _ := json.Marshal(struct {
+			Message   string `json:"message"`
+			OrderId   string `json:"orderId"`
+			Recipient string `json:"recipient"`
+		}{
+			Message:   "Successfully sent email",
+			OrderId:   payload.OrderId,
+			Recipient: payload.Email,
+		})
+		w.Write(responseJSON)
+	}
+}
+
+func getOrderConfirmationPayload(r *http.Request) (*mail.OrderConfirmationData, error) {
+	decoder := json.NewDecoder(r.Body)
+
+	var payload mail.OrderConfirmationData
+	err := decoder.Decode(&payload)
+	if err != nil {
+		return nil, fmt.Errorf("decode: %w", err)
+	}
+
+	return &payload, nil
+}

server/handler/error.go

@@ -0,0 +1,24 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// handleError - Logs the error (if shouldLog is true), and outputs the error message (msg)
+func handleError(w http.ResponseWriter, err error, msg string, statusCode int, shouldLog bool) {
+	if shouldLog {
+		log.WithField("err", err).Error(msg)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	errorJSON, _ := json.Marshal(struct {
+		Error string `json:"error"`
+	}{
+		Error: msg,
+	})
+	w.Write(errorJSON)
+}

server/handler/healthz.go

@@ -0,0 +1,11 @@
+package handler
+
+import "net/http"
+
+// Healthz is used for our readiness and liveness probes.
+// 		GET /_healthz
+// 		Responds: 200
+func Healthz(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(http.StatusText(http.StatusOK)))
+}

server/router.go

@@ -0,0 +1,14 @@
+package server
+
+import (
+	"github.com/kevinmidboe/planetposen-mail/server/handler"
+)
+
+const v1API string = "/api/v1/"
+
+func (s *Server) setupRoutes() {
+	s.Router.HandleFunc("/_healthz", handler.Healthz).Methods("GET").Name("Health")
+
+	api := s.Router.PathPrefix(v1API).Subrouter()
+	api.HandleFunc("/send-confirmation", handler.SendOrderConfirmation(s.SendGrid)).Methods("POST").Name("SendOrderConfirmation")
+}

server/server.go

@@ -0,0 +1,85 @@
+// Package server provides functionality to easily set up an HTTTP server.
+//
+// Clients:
+//		Database
+package server
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/gorilla/mux"
+	"github.com/kevinmidboe/planetposen-mail/client/sendgrid"
+	"github.com/kevinmidboe/planetposen-mail/config"
+	log "github.com/sirupsen/logrus"
+)
+
+// Server holds the HTTP server, router, config and all clients.
+type Server struct {
+	Config   *config.Config
+	HTTP     *http.Server
+	Router   *mux.Router
+	SendGrid *sendgrid.Client
+}
+
+// Create sets up the HTTP server, router and all clients.
+// Returns an error if an error occurs.
+func (s *Server) Create(ctx context.Context, config *config.Config) error {
+	// metrics.RegisterPrometheusCollectors()
+
+	s.Config = config
+	s.Router = mux.NewRouter()
+	s.HTTP = &http.Server{
+		Addr:    fmt.Sprintf(":%s", s.Config.Port),
+		Handler: s.Router,
+	}
+
+	var sendGridClient sendgrid.Client
+	if err := sendGridClient.Init(config); err != nil {
+		return fmt.Errorf("error initializing sendgrid client: %w", err)
+	}
+
+	s.SendGrid = &sendGridClient
+
+	s.setupRoutes()
+
+	return nil
+}
+
+// Serve tells the server to start listening and serve HTTP requests.
+// It also makes sure that the server gracefully shuts down on exit.
+// Returns an error if an error occurs.
+func (s *Server) Serve(ctx context.Context) error {
+	// closer, err := trace.InitGlobalTracer(s.Config)
+
+	// if err != nil {
+	// 	return err
+	// }
+
+	// defer closer.Close()
+
+	go func(ctx context.Context, s *Server) {
+		stop := make(chan os.Signal, 1)
+		signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+
+		<-stop
+
+		log.Info("Shutdown signal received")
+
+		if err := s.HTTP.Shutdown(ctx); err != nil {
+			log.Error(err.Error())
+		}
+	}(ctx, s)
+
+	log.Infof("Ready at: %s", s.Config.Port)
+
+	if err := s.HTTP.ListenAndServe(); err != http.ErrServerClosed {
+		log.Fatalf(err.Error())
+	}
+
+	return nil
+}