Addming a logEvent function to our listener ms

listener-service/event/consumer.go

@@ -0,0 +1,176 @@
+package event
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"net/http"
+
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+type Consumer struct {
+	conn      *amqp.Connection
+	queueName string
+}
+
+func NewConsumer(conn *amqp.Connection) (Consumer, error) {
+	consumer := Consumer{
+		conn: conn,
+	}
+
+	err := consumer.setup()
+	if err != nil {
+		return Consumer{}, err
+	}
+	return consumer, err
+}
+
+func (consumer *Consumer) setup() error {
+	channel, err := consumer.conn.Channel()
+	if err != nil {
+		return err
+	}
+
+	return declaireExchange(channel)
+}
+
+type Payload struct {
+	Name string `json:"name"`
+	Data string `json:"data"`
+}
+
+func (consumer *Consumer) Listen(topics []string) error {
+	ch, err := consumer.conn.Channel()
+	if err != nil {
+		return err
+	}
+	defer ch.Close()
+
+	q, err := declaireRandomQueue(ch)
+	if err != nil {
+		return err
+	}
+
+	for _, s := range topics {
+		ch.QueueBind(q.Name, s, "logs_topic", false, nil)
+	}
+
+	messages, err := ch.Consume(q.Name, "", true, false, false, false, nil)
+	if err != nil {
+		return err
+	}
+
+	forever := make(chan bool)
+	go func() {
+		for d := range messages {
+			var payload Payload
+			json.Unmarshal(d.Body, &payload)
+
+			go handlePayload(payload)
+		}
+	}()
+
+	fmt.Printf("Waiting for message [Exchange, Queue] [logs_topic, %s]\n", q.Name)
+	<-forever
+	return nil
+}
+
+func handlePayload(payload Payload) {
+	switch payload.Name {
+	case "log", "event":
+		// log whatever we get
+		err := logEvent(payload)
+		if err != nil {
+			log.Println(err)
+		}
+	case "auth":
+		// authenticate
+		// You can have as many cases as you want, as long as you write the logic.
+	default:
+		err := logEvent(payload)
+		if err != nil {
+			log.Println(err)
+		}
+	}
+}
+
+func logEvent(entry Payload) error {
+	log.Println(entry)
+	loggerService := Microservice{
+		Input: entry,
+		Addr:  "http://logger-service/log",
+		ErrCode: statusError{
+			ExpectedCode: http.StatusAccepted,
+			ErrCode:      http.StatusInternalServerError,
+			Err:          errors.New("internal error"),
+		},
+		SuccessMsg: "Logged!",
+	}
+	return callService(loggerService)
+}
+
+// func (app *Config) SendMail(w http.ResponseWriter, entry MailPayload) {
+// 	log.Println(entry)
+// 	mailService := Microservice{
+// 		Input: entry,
+// 		Addr:  "http://mail-service/send-mail",
+// 		ErrCode: statusError{
+// 			ExpectedCode: http.StatusAccepted,
+// 			ErrCode:      http.StatusInternalServerError,
+// 			Err:          errors.New("internal error"),
+// 		},
+// 		SuccessMsg: "Mail sent!",
+// 	}
+// 	app.callService(w, mailService)
+// }
+
+type statusError struct {
+	ExpectedCode int
+	ErrCode      int
+	Err          error
+}
+
+type Microservice struct {
+	Input      any
+	Addr       string
+	ErrCode    statusError
+	SuccessMsg string
+}
+
+func callService(ms Microservice) error {
+	// create some json we'll send to the microservice
+	inputPayload, err := json.MarshalIndent(ms.Input, "", "\t")
+	if err != nil {
+		return err
+	}
+	log.Println(ms.Input)
+
+	// call the service
+	req, err := http.NewRequest(
+		"POST",
+		ms.Addr,
+		bytes.NewBuffer(inputPayload),
+	)
+	if err != nil {
+		return err
+	}
+	req.Header.Add("Content-Type", "application/json")
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	log.Println(resp.Body)
+
+	// make sure we get back the correct status code
+	if resp.StatusCode != ms.ErrCode.ExpectedCode {
+		return err
+	}
+
+	return nil
+}

listener-service/event/event.go

@@ -0,0 +1,28 @@
+package event
+
+import (
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+func declaireExchange(ch *amqp.Channel) error {
+	return ch.ExchangeDeclare(
+		"logs_topic", // name
+		"topic",      // type
+		true,         // durable?
+		false,        // auto-deleted?
+		false,        // internal?
+		false,        // no-wait?
+		nil,          // arguments?
+	)
+}
+
+func declaireRandomQueue(ch *amqp.Channel) (amqp.Queue, error) {
+	return ch.QueueDeclare(
+		"",    // name
+		false, // durable
+		false, // delete when unused
+		true,  // exclusive
+		false, // nowait
+		nil,   // table
+	)
+}

listener-service/go.mod

@@ -0,0 +1,5 @@
+module listener
+
+go 1.22.5
+
+require github.com/rabbitmq/amqp091-go v1.10.0

listener-service/go.sum

@@ -0,0 +1,4 @@
+github.com/rabbitmq/amqp091-go v1.10.0 h1:STpn5XsHlHGcecLmMFCtg7mqq0RnD+zFr4uzukfVhBw=
+github.com/rabbitmq/amqp091-go v1.10.0/go.mod h1:Hy4jKW5kQART1u+JkDTF9YYOQUHXqMuhrgxOEeS7G4o=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=

listener-service/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"os"
+	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+func main() {
+	// try to connect to rabbitmq
+	rabbitConn, err := connect()
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	defer rabbitConn.Close()
+	log.Println("Connected to RabbitMQ")
+
+	// start listening for messages
+
+	// create consumer
+
+	// watch the queue and consume events
+}
+
+func connect() (*amqp.Connection, error) {
+	var counts int64
+	var connection *amqp.Connection
+
+	// don't continue until rabbit is ready
+	for {
+		c, err := amqp.Dial("amqp://guest:guest@localhost") // XXX: credentials
+		if err != nil {
+			fmt.Println("RabbitMQ not yet ready...")
+			counts++
+		} else {
+			connection = c
+			break
+		}
+
+		if counts > 5 {
+			fmt.Println(err)
+			return nil, err
+		}
+
+		backOff := time.Duration(math.Pow(float64(counts), 2) * float64(time.Second))
+		log.Println("backing off...")
+		time.Sleep(backOff)
+	}
+
+	return connection, nil
+}

mail-service/cmd/api/handlers.go

@@ -5,10 +5,8 @@ import (
 	"fmt"
 	"log"
 	"net/http"
-	"time"
 
 	"github.com/tsawler/toolbox"
-	mail "github.com/xhit/go-simple-mail/v2"
 )
 
 type MailData struct {
@@ -35,7 +33,13 @@ func (app *Config) SendMail(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	err = app.SendMsg(mailData)
+	msg := Message{
+		From:    mailData.From,
+		To:      mailData.To,
+		Subject: mailData.Subject,
+		Data:    mailData.Content,
+	}
+	err = app.Mailer.SendSMTPMessage(msg)
 	if err != nil {
 		log.Println(err)
 		app.Tools.ErrorJSON(w, err)
@@ -48,37 +52,3 @@ func (app *Config) SendMail(w http.ResponseWriter, r *http.Request) {
 
 	app.Tools.WriteJSON(w, http.StatusAccepted, payload)
 }
-
-func (app *Config) SendMsg(m MailData) error {
-	server := mail.NewSMTPClient()
-	server.Host = app.Host
-	server.Port = app.Port
-
-	server.KeepAlive = false
-	server.ConnectTimeout = 10 * time.Second
-	server.SendTimeout = 10 * time.Second
-
-	smtpClient, err := server.Connect()
-	if err != nil {
-		log.Println(err)
-		return err
-	}
-
-	// Maybe add a template
-
-	email := mail.NewMSG()
-	email.SetFrom(m.From).
-		AddTo(m.To).
-		SetSubject(m.Subject).
-		SetBody(mail.TextHTML, m.Content)
-
-	err = email.Send(smtpClient)
-	if err != nil {
-		log.Println(err)
-		return err
-	}
-
-	log.Printf("Email sent to %s", m.To)
-
-	return nil
-}

mail-service/cmd/api/mailer.go

@@ -0,0 +1,168 @@
+package main
+
+import (
+	"bytes"
+	"embed"
+	"html/template"
+	"log"
+	"time"
+
+	"github.com/vanng822/go-premailer/premailer"
+	mail "github.com/xhit/go-simple-mail/v2"
+)
+
+//go:embed templates
+var emailTemplateFS embed.FS
+
+type Mail struct {
+	Domain     string
+	Host       string
+	Port       int
+	Username   string
+	Password   string
+	Encryption string
+	FromAddr   string
+	FromName   string
+}
+
+type Message struct {
+	From        string
+	FromName    string
+	To          string
+	Subject     string
+	Attachments []string
+	Data        any
+	DataMap     map[string]any
+}
+
+func (m *Mail) SendSMTPMessage(msg Message) error {
+	if msg.From == "" {
+		msg.From = m.FromAddr
+	}
+
+	if msg.FromName == "" {
+		msg.FromName = m.FromName
+	}
+
+	data := map[string]any{
+		"message": msg.Data,
+	}
+
+	msg.DataMap = data
+
+	formattedMessage, err := m.buildHTMLMessage(msg)
+	if err != nil {
+		return err
+	}
+	plainMessage, err := m.buildPlainTextMessage(msg)
+	if err != nil {
+		return err
+	}
+
+	server := mail.NewSMTPClient()
+	server.Host = m.Host
+	server.Port = m.Port
+	server.Username = m.Username
+	server.Password = m.Password
+	server.Encryption = m.getEncryption(m.Encryption)
+	server.KeepAlive = false
+	server.ConnectTimeout = 10 * time.Second
+	server.SendTimeout = 10 * time.Second
+
+	log.Println(server.Host, server.Port)
+
+	smtpClient, err := server.Connect()
+	if err != nil {
+		return err
+	}
+
+	email := mail.NewMSG()
+	email.SetFrom(msg.From).AddTo(msg.To).SetSubject(msg.Subject)
+
+	email.SetBody(mail.TextPlain, plainMessage)
+	email.AddAlternative(mail.TextHTML, formattedMessage)
+
+	if len(msg.Attachments) > 0 {
+		for _, x := range msg.Attachments {
+			email.AddAttachment(x)
+		}
+	}
+
+	err = email.Send(smtpClient)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (m *Mail) buildPlainTextMessage(msg Message) (string, error) {
+	templateToRender := "templates/mail.plain.gohtml"
+
+	t, err := template.New("email-plain").ParseFS(emailTemplateFS, templateToRender)
+	if err != nil {
+		return "", err
+	}
+
+	var tpl bytes.Buffer
+	if err = t.ExecuteTemplate(&tpl, "body", msg.DataMap); err != nil {
+		return "", err
+	}
+
+	formattedMessage := tpl.String()
+
+	return formattedMessage, nil
+}
+
+func (m *Mail) buildHTMLMessage(msg Message) (string, error) {
+	templateToRender := "templates/mail.html.gohtml"
+
+	t, err := template.New("email-html").ParseFS(emailTemplateFS, templateToRender)
+	if err != nil {
+		return "", err
+	}
+
+	var tpl bytes.Buffer
+	if err = t.ExecuteTemplate(&tpl, "body", msg.DataMap); err != nil {
+		return "", err
+	}
+
+	formattedMessage := tpl.String()
+	formattedMessage, err = m.inlineCSS(formattedMessage)
+	if err != nil {
+		return "", err
+	}
+
+	return formattedMessage, nil
+}
+
+func (m *Mail) inlineCSS(s string) (string, error) {
+	options := premailer.Options{
+		RemoveClasses:     false,
+		CssToAttributes:   false,
+		KeepBangImportant: true,
+	}
+
+	prem, err := premailer.NewPremailerFromString(s, &options)
+	if err != nil {
+		return "", err
+	}
+	html, err := prem.Transform()
+	if err != nil {
+		return "", err
+	}
+	return html, nil
+}
+
+func (m *Mail) getEncryption(s string) mail.Encryption {
+	switch s {
+	case "tls":
+		return mail.EncryptionSTARTTLS
+	case "ssl":
+		return mail.EncryptionSSLTLS
+	case "none":
+		return mail.EncryptionNone
+	default:
+		return mail.EncryptionNone
+	}
+}

mail-service/cmd/api/main.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
+	"strconv"
 
 	"github.com/tsawler/toolbox"
 )
@@ -17,12 +19,12 @@ type Config struct {
 	Password   string
 	Encryption string
 	Tools      toolbox.Tools
+	Mailer     Mail
 }
 
 func main() {
 	app := Config{
-		Host: "mailhog",
-		Port: 1025,
+		Mailer: createMail(),
 	}
 
 	log.Printf("Starting mail service on port %s\n", webPort)
@@ -38,3 +40,17 @@ func main() {
 		log.Panic(err)
 	}
 }
+
+func createMail() Mail {
+	port, _ := strconv.Atoi(os.Getenv("MAIL_PORT"))
+	return Mail{
+		Domain:     os.Getenv("MAIL_DOMAIN"),
+		Host:       os.Getenv("MAIL_HOST"),
+		Port:       port,
+		Username:   os.Getenv("MAIL_USERNAME"),
+		Password:   os.Getenv("MAIL_PASSWORD"),
+		Encryption: os.Getenv("MAIL_ENCRYPTION"),
+		FromName:   os.Getenv("FROM_NAME"),
+		FromAddr:   os.Getenv("FROM_ADDR"),
+	}
+}

mail-service/cmd/api/templates/mail.html.gohtml

@@ -0,0 +1,13 @@
+{{ define "body" }}
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta name="viewport" content="width=device-width">
+        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+        <title></title>
+    </head>
+    <body>
+        <p>{{.message}}</p>
+    </body>
+</html>
+{{ end }}

mail-service/cmd/api/templates/mail.plain.gohtml

@@ -0,0 +1,3 @@
+{{ define "body" }}
+{{.message}}
+{{ end }}

mail-service/go.mod

@@ -6,11 +6,17 @@ require (
 	github.com/go-chi/chi/v5 v5.1.0
 	github.com/go-chi/cors v1.2.1
 	github.com/tsawler/toolbox v1.3.1
+	github.com/vanng822/go-premailer v1.21.0
 	github.com/xhit/go-simple-mail/v2 v2.16.0
 )
 
 require (
+	github.com/PuerkitoBio/goquery v1.9.1 // indirect
+	github.com/andybalholm/cascadia v1.3.2 // indirect
 	github.com/go-test/deep v1.1.1 // indirect
+	github.com/gorilla/css v1.0.1 // indirect
 	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/toorop/go-dkim v0.0.0-20201103131630-e1cd1a0a5208 // indirect
+	github.com/vanng822/css v1.0.1 // indirect
+	golang.org/x/net v0.23.0 // indirect
 )

mail-service/go.sum

@@ -1,20 +1,85 @@
+github.com/PuerkitoBio/goquery v1.9.1 h1:mTL6XjbJTZdpfL+Gwl5U2h1l9yEkJjhmlTeV9VPW7UI=
+github.com/PuerkitoBio/goquery v1.9.1/go.mod h1:cW1n6TmIMDoORQU5IU/P1T3tGFunOeXEpGP2WHRwkbY=
+github.com/andybalholm/cascadia v1.3.2 h1:3Xi6Dw5lHF15JtdcmAHD3i1+T8plmv7BQ/nsViSLyss=
+github.com/andybalholm/cascadia v1.3.2/go.mod h1:7gtRlve5FxPPgIgX36uWBX58OdBsSS6lUvCFb+h7KvU=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385/go.mod h1:0vRUJqYpeSZifjYj7uP3BG/gKcuzL9xWVV/Y+cK33KM=
 github.com/go-chi/chi/v5 v5.1.0 h1:acVI1TYaD+hhedDJ3r54HyA6sExp3HfXq7QWEEY/xMw=
 github.com/go-chi/chi/v5 v5.1.0/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
 github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
 github.com/go-test/deep v1.1.1 h1:0r/53hagsehfO4bzD2Pgr/+RgHqhmf+k1Bpse2cTu1U=
 github.com/go-test/deep v1.1.1/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
+github.com/gorilla/css v1.0.1 h1:ntNaBIghp6JmvWnxbZKANoLyuXTPZ4cAMlo6RyhlbO8=
+github.com/gorilla/css v1.0.1/go.mod h1:BvnYkspnSzMmwRK+b8/xgNPLiIuNZr6vbZBTPQ2A3b0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/toorop/go-dkim v0.0.0-20201103131630-e1cd1a0a5208 h1:PM5hJF7HVfNWmCjMdEfbuOBNXSVF2cMFGgQTPdKCbwM=
 github.com/toorop/go-dkim v0.0.0-20201103131630-e1cd1a0a5208/go.mod h1:BzWtXXrXzZUvMacR0oF/fbDDgUPO8L36tDMmRAf14ns=
 github.com/tsawler/toolbox v1.3.1 h1:zqnt5L5dmWiBrs2JgE1VeHJJO/IMStFKQgWxc+eriEE=
 github.com/tsawler/toolbox v1.3.1/go.mod h1:bYUEtJ09HFx534XcjXdTIzv7MCKsg9SrhSGELFe6HI4=
+github.com/unrolled/render v1.0.3/go.mod h1:gN9T0NhL4Bfbwu8ann7Ry/TGHYfosul+J0obPf6NBdM=
+github.com/vanng822/css v1.0.1 h1:10yiXc4e8NI8ldU6mSrWmSWMuyWgPr9DZ63RSlsgDw8=
+github.com/vanng822/css v1.0.1/go.mod h1:tcnB1voG49QhCrwq1W0w5hhGasvOg+VQp9i9H1rCM1w=
+github.com/vanng822/go-premailer v1.21.0 h1:qIwX4urphNPO3xa60MGqowmyjzzMtFacJPKNrt1UWFU=
+github.com/vanng822/go-premailer v1.21.0/go.mod h1:6Y3H2NzNmK3sFBNgR1ENdfV9hzG8hMzrA1nL/XBbbP4=
+github.com/vanng822/r2router v0.0.0-20150523112421-1023140a4f30/go.mod h1:1BVq8p2jVr55Ost2PkZWDrG86PiJ/0lxqcXoAcGxvWU=
 github.com/xhit/go-simple-mail/v2 v2.16.0 h1:ouGy/Ww4kuaqu2E2UrDw7SvLaziWTB60ICLkIkNVccA=
 github.com/xhit/go-simple-mail/v2 v2.16.0/go.mod h1:b7P5ygho6SYE+VIqpxA6QkYfv4teeyG4MKqB3utRu98=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
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project/docker-compose.yml

@@ -39,6 +39,16 @@ services:
     deploy:
       mode: replicated
       replicas: 1
+    environment:
+      MAIL_DOMAIN: localhost
+      MAIL_HOST: mailhog
+      MAIL_PORT: 1025
+      MAIL_USERNAME: ""
+      MAIL_PASSWORD: ""
+      MAIL_ENCRYPTION: none
+      FROM_NAME: me
+      FROM_ADDR: me@here.com
+
 
   postgres:
     image: postgres:16.4-alpine