Add grpc client in broker service

.gitignore

@@ -6,5 +6,6 @@ cred.txt
 dist/
 .air.toml
 tmp/
-broker-service/brokerApp
-front-end/frontApp
+*/*App
+project/db-data/
+**/*.pb.go

authentication-service/authentication-service.dockerfile

@@ -0,0 +1,8 @@
+FROM alpine:latest
+
+RUN mkdir /app
+
+COPY authApp /app
+
+CMD ["/app/authApp"]
+

authentication-service/cmd/api/handlers.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+)
+
+func (app *Config) Authenticate(w http.ResponseWriter, r *http.Request) {
+	var requestPayload struct {
+		Email    string `json:"email"`
+		Password string `json:"password"`
+	}
+
+	err := app.readJSON(w, r, &requestPayload)
+	if err != nil {
+		app.errorJSON(w, err, http.StatusBadRequest)
+		return
+	}
+
+	user, err := app.Models.User.GetByEmail(requestPayload.Email)
+	if err != nil {
+		// user not found
+		app.errorJSON(w, errors.New("invalid credentials"), http.StatusBadRequest)
+		return
+	}
+
+	valid, err := user.PasswordMatches(requestPayload.Password)
+	if err != nil || !valid {
+		app.errorJSON(w, errors.New("invalid credentials"), http.StatusBadRequest)
+		return
+	}
+
+	// log authentication
+
+	err = app.logRequest("authentication", fmt.Sprintf("%s is logged in", user.Email))
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+
+	payload := jsonResponse{
+		Error:   false,
+		Message: fmt.Sprintf("%s %s is authorized to log in.", user.FirstName, user.LastName),
+		Data:    user,
+	}
+
+	app.writeJSON(w, http.StatusAccepted, payload)
+}
+
+func (app *Config) logRequest(name, data string) error {
+	var entry struct {
+		Name string `json:"name"`
+		Data string `json:"data"`
+	}
+
+	entry.Name = name
+	entry.Data = data
+
+	jsonData, _ := json.MarshalIndent(entry, "", "\t")
+
+	logServiceURL := "http://logger-service/log"
+
+	request, err := http.NewRequest("POST", logServiceURL, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return err
+	}
+	request.Header.Add("Content-Type", "application/json")
+	client := &http.Client{}
+	_, err = client.Do(request)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

authentication-service/cmd/api/helpers.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+)
+
+type jsonResponse struct {
+	Error   bool   `json:"error"`
+	Message string `json:"message"`
+	Data    any    `json:"data,omitempty"`
+}
+
+func (app *Config) readJSON(w http.ResponseWriter, r *http.Request, data any) error {
+	maxBytes := 1048576 // one megabyte
+
+	r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes))
+
+	dec := json.NewDecoder(r.Body)
+
+	err := dec.Decode(data)
+	if err != nil {
+		return err
+	}
+
+	err = dec.Decode(&struct{}{})
+	if err != io.EOF {
+		return errors.New("body must have only a single JSON value")
+	}
+
+	return nil
+}
+
+func (app *Config) writeJSON(
+	w http.ResponseWriter,
+	status int,
+	data any,
+	headers ...http.Header,
+) error {
+	out, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	if len(headers) > 0 {
+		for key, value := range headers[0] {
+			w.Header()[key] = value
+		}
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_, err = w.Write(out)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (app *Config) errorJSON(w http.ResponseWriter, err error, status ...int) error {
+	statusCode := http.StatusBadRequest
+
+	if len(status) > 0 {
+		statusCode = status[0]
+	}
+
+	var payload jsonResponse
+	payload.Error = true
+	payload.Message = err.Error()
+
+	return app.writeJSON(w, statusCode, payload)
+}

authentication-service/cmd/api/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"authentication/data"
+	"database/sql"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+
+	_ "github.com/jackc/pgconn"
+	_ "github.com/jackc/pgx/v4"
+	_ "github.com/jackc/pgx/v4/stdlib"
+)
+
+const webPort = "80"
+
+var counts int64
+
+type Config struct {
+	DB     *sql.DB
+	Models data.Models
+}
+
+func main() {
+	// connect to DB
+	conn := connectToDB()
+
+	if conn == nil {
+		log.Panic("Can't connect to Postgres!")
+	}
+
+	// set up config
+	app := Config{
+		DB:     conn,
+		Models: data.New(conn),
+	}
+
+	log.Printf("Starting authentication service on port %s\n", webPort)
+
+	// define http server
+	srv := &http.Server{
+		Addr:    fmt.Sprintf(":%s", webPort),
+		Handler: app.routes(),
+	}
+
+	err := srv.ListenAndServe()
+	if err != nil {
+		log.Panic(err)
+	}
+}
+
+func openDB(dsn string) (*sql.DB, error) {
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return nil, err
+	}
+
+	err = db.Ping()
+	if err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func connectToDB() *sql.DB {
+	dsn := os.Getenv("DSN")
+
+	for {
+		connection, err := openDB(dsn)
+		if err != nil {
+			log.Println("Postgres not yet ready ...: ", err)
+			counts++
+		} else {
+			log.Println("Connected to Postgres!")
+			return connection
+		}
+
+		if counts > 10 {
+			return nil
+		}
+
+		log.Println("Backing off for two seconds...")
+		time.Sleep(2 * time.Second)
+	}
+}

authentication-service/cmd/api/routes.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
+)
+
+func (app *Config) routes() http.Handler {
+	mux := chi.NewRouter()
+
+	// specify who is allowed to connect
+	mux.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{"https://*", "http://*"},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: true,
+		MaxAge:           300,
+	}))
+
+	mux.Use(middleware.Heartbeat("/ping"))
+
+	mux.Post("/authenticate", app.Authenticate)
+
+	return mux
+}

authentication-service/data/models.go

@@ -0,0 +1,264 @@
+package data
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"log"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+const dbTimeout = time.Second * 3
+
+var db *sql.DB
+
+// New is the function used to create an instance of the data package. It returns the type
+// Model, which embeds all the types we want to be available to our application.
+func New(dbPool *sql.DB) Models {
+	db = dbPool
+
+	return Models{
+		User: User{},
+	}
+}
+
+// Models is the type for this package. Note that any model that is included as a member
+// in this type is available to us throughout the application, anywhere that the
+// app variable is used, provided that the model is also added in the New function.
+type Models struct {
+	User User
+}
+
+// User is the structure which holds one user from the database.
+type User struct {
+	ID        int       `json:"id"`
+	Email     string    `json:"email"`
+	FirstName string    `json:"first_name,omitempty"`
+	LastName  string    `json:"last_name,omitempty"`
+	Password  string    `json:"-"`
+	Active    int       `json:"active"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+// GetAll returns a slice of all users, sorted by last name
+func (u *User) GetAll() ([]*User, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	query := `select id, email, first_name, last_name, password, user_active, created_at, updated_at
+	from users order by last_name`
+
+	rows, err := db.QueryContext(ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var users []*User
+
+	for rows.Next() {
+		var user User
+		err := rows.Scan(
+			&user.ID,
+			&user.Email,
+			&user.FirstName,
+			&user.LastName,
+			&user.Password,
+			&user.Active,
+			&user.CreatedAt,
+			&user.UpdatedAt,
+		)
+		if err != nil {
+			log.Println("Error scanning", err)
+			return nil, err
+		}
+
+		users = append(users, &user)
+	}
+
+	return users, nil
+}
+
+// GetByEmail returns one user by email
+func (u *User) GetByEmail(email string) (*User, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	query := `select id, email, first_name, last_name, password, user_active, created_at, updated_at from users where email = $1`
+
+	var user User
+	row := db.QueryRowContext(ctx, query, email)
+
+	err := row.Scan(
+		&user.ID,
+		&user.Email,
+		&user.FirstName,
+		&user.LastName,
+		&user.Password,
+		&user.Active,
+		&user.CreatedAt,
+		&user.UpdatedAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+// GetOne returns one user by id
+func (u *User) GetOne(id int) (*User, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	query := `select id, email, first_name, last_name, password, user_active, created_at, updated_at from users where id = $1`
+
+	var user User
+	row := db.QueryRowContext(ctx, query, id)
+
+	err := row.Scan(
+		&user.ID,
+		&user.Email,
+		&user.FirstName,
+		&user.LastName,
+		&user.Password,
+		&user.Active,
+		&user.CreatedAt,
+		&user.UpdatedAt,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+// Update updates one user in the database, using the information
+// stored in the receiver u
+func (u *User) Update() error {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	stmt := `update users set
+		email = $1,
+		first_name = $2,
+		last_name = $3,
+		user_active = $4,
+		updated_at = $5
+		where id = $6
+	`
+
+	_, err := db.ExecContext(ctx, stmt,
+		u.Email,
+		u.FirstName,
+		u.LastName,
+		u.Active,
+		time.Now(),
+		u.ID,
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Delete deletes one user from the database, by User.ID
+func (u *User) Delete() error {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	stmt := `delete from users where id = $1`
+
+	_, err := db.ExecContext(ctx, stmt, u.ID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// DeleteByID deletes one user from the database, by ID
+func (u *User) DeleteByID(id int) error {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	stmt := `delete from users where id = $1`
+
+	_, err := db.ExecContext(ctx, stmt, id)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Insert inserts a new user into the database, and returns the ID of the newly inserted row
+func (u *User) Insert(user User) (int, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(user.Password), 12)
+	if err != nil {
+		return 0, err
+	}
+
+	var newID int
+	stmt := `insert into users (email, first_name, last_name, password, user_active, created_at, updated_at)
+		values ($1, $2, $3, $4, $5, $6, $7) returning id`
+
+	err = db.QueryRowContext(ctx, stmt,
+		user.Email,
+		user.FirstName,
+		user.LastName,
+		hashedPassword,
+		user.Active,
+		time.Now(),
+		time.Now(),
+	).Scan(&newID)
+	if err != nil {
+		return 0, err
+	}
+
+	return newID, nil
+}
+
+// ResetPassword is the method we will use to change a user's password.
+func (u *User) ResetPassword(password string) error {
+	ctx, cancel := context.WithTimeout(context.Background(), dbTimeout)
+	defer cancel()
+
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 12)
+	if err != nil {
+		return err
+	}
+
+	stmt := `update users set password = $1 where id = $2`
+	_, err = db.ExecContext(ctx, stmt, hashedPassword, u.ID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// PasswordMatches uses Go's bcrypt package to compare a user supplied password
+// with the hash we have stored for a given user in the database. If the password
+// and hash match, we return true; otherwise, we return false.
+func (u *User) PasswordMatches(plainText string) (bool, error) {
+	err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(plainText))
+	if err != nil {
+		switch {
+		case errors.Is(err, bcrypt.ErrMismatchedHashAndPassword):
+			// invalid password
+			return false, nil
+		default:
+			return false, err
+		}
+	}
+
+	return true, nil
+}

authentication-service/go.mod

@@ -0,0 +1,21 @@
+module authentication
+
+go 1.22.5
+
+require (
+	github.com/go-chi/chi/v5 v5.1.0
+	github.com/go-chi/cors v1.2.1
+	github.com/jackc/pgconn v1.14.3
+	github.com/jackc/pgx/v4 v4.18.3
+	golang.org/x/crypto v0.26.0
+)
+
+require (
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.3.3 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgtype v1.14.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+)

authentication-service/go.sum

@@ -0,0 +1,184 @@
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+golang.org/x/tools v0.0.0-20190425163242-31fd60d6bfdc/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
+golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200103221440-774c71fcf114/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=

authentication-service/users.sql

@@ -0,0 +1,60 @@
+
+
+--
+-- Name: user_id_seq; Type: SEQUENCE; Schema: public; Owner: postgres
+--
+
+CREATE SEQUENCE public.user_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.user_id_seq OWNER TO postgres;
+
+SET default_tablespace = '';
+
+SET default_table_access_method = heap;
+
+--
+-- Name: users; Type: TABLE; Schema: public; Owner: postgres
+--
+
+CREATE TABLE public.users (
+    id integer DEFAULT nextval('public.user_id_seq'::regclass) NOT NULL,
+    email character varying(255),
+    first_name character varying(255),
+    last_name character varying(255),
+    password character varying(60),
+    user_active integer DEFAULT 0,
+    created_at timestamp without time zone,
+    updated_at timestamp without time zone
+);
+
+
+ALTER TABLE public.users OWNER TO postgres;
+
+--
+-- Name: user_id_seq; Type: SEQUENCE SET; Schema: public; Owner: postgres
+--
+
+SELECT pg_catalog.setval('public.user_id_seq', 1, true);
+
+
+--
+-- Name: users users_pkey; Type: CONSTRAINT; Schema: public; Owner: postgres
+--
+
+ALTER TABLE ONLY public.users
+    ADD CONSTRAINT users_pkey PRIMARY KEY (id);
+
+
+INSERT INTO "public"."users"("email","first_name","last_name","password","user_active","created_at","updated_at")
+VALUES
+(E'admin@example.com',E'Admin',E'User',E'$2a$12$1zGLuYDDNvATh4RA4avbKuheAMpb1svexSzrQm7up.bnpwQHs0jNe',1,E'2022-03-14 00:00:00',E'2022-03-14 00:00:00');
+
+
+
+

broker-service/cmd/api/handlers.go

@@ -1,9 +1,46 @@
 package main
 
 import (
+	"broker/event"
+	"broker/logs"
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
 	"net/http"
+	"net/rpc"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 )
 
+type RequestPayload struct {
+	Action string      `string:"action"`
+	Auth   AuthPayload `                json:"auth,omitempty"`
+	Log    LogPayload  `                json:"log,omitempty"`
+	Mail   MailPayload `                json:"mail,omitempty"`
+}
+
+type AuthPayload struct {
+	Email    string `json:"email"`
+	Password string `json:"password"`
+}
+
+type LogPayload struct {
+	Name string `json:"name"`
+	Data string `json:"data"`
+}
+
+type MailPayload struct {
+	From    string `json:"from"`
+	To      string `json:"to"`
+	Subject string `json:"subject"`
+	Content string `json:"content"`
+}
+
 func (app *Config) Broker(w http.ResponseWriter, r *http.Request) {
 	payload := jsonResponse{
 		Error:   false,
@@ -12,3 +49,250 @@ func (app *Config) Broker(w http.ResponseWriter, r *http.Request) {
 
 	app.writeJSON(w, http.StatusOK, payload)
 }
+
+func (app *Config) HandleSubmission(w http.ResponseWriter, r *http.Request) {
+	var requestPayload RequestPayload
+
+	err := app.readJSON(w, r, &requestPayload)
+	if err != nil {
+		app.errorJSON(w, err, http.StatusBadRequest)
+		return
+	}
+
+	switch requestPayload.Action {
+	case "auth":
+		app.authenticate(w, requestPayload.Auth)
+	case "logHttp": // 2336 us
+		app.LogItem(w, requestPayload.Log)
+	case "logRabbit": // 7825 us
+		app.logEventViaRabbit(w, requestPayload.Log)
+	case "logRpc": // 2097 us
+		app.logItemViaRPC(w, requestPayload.Log)
+	case "logGrpc": // 236882 us
+		app.LogViaGRPC(w, requestPayload.Log)
+	case "mail":
+		app.SendMail(w, requestPayload.Mail)
+	default:
+		app.errorJSON(w, errors.New("unknown action"))
+	}
+}
+
+func (app *Config) authenticate(w http.ResponseWriter, a AuthPayload) {
+	authService := Microservice{
+		Input: a,
+		Addr:  "http://authentication-service/authenticate",
+		ErrCode: statusError{
+			ExpectedCode: http.StatusAccepted,
+			ErrCode:      http.StatusUnauthorized,
+			Err:          errors.New("invalid credentials"),
+		},
+		SuccessMsg: "Authenticated",
+	}
+	app.callService(w, authService)
+}
+
+func (app *Config) LogItem(w http.ResponseWriter, entry LogPayload) {
+	log.Println(entry)
+	now := time.Now()
+	entry.Data += fmt.Sprintf("HTTP sent date %d", now.UnixMicro())
+	loggerService := Microservice{
+		Input: entry,
+		Addr:  "http://logger-service/log",
+		ErrCode: statusError{
+			ExpectedCode: http.StatusAccepted,
+			ErrCode:      http.StatusInternalServerError,
+			Err:          errors.New("internal error"),
+		},
+		SuccessMsg: "Logged!",
+	}
+	app.callService(w, 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 (app *Config) callService(w http.ResponseWriter, ms Microservice) {
+	// create some json we'll send to the microservice
+	inputPayload, err := json.MarshalIndent(ms.Input, "", "\t")
+	if err != nil {
+		app.errorJSON(w, err, http.StatusBadRequest)
+		return
+	}
+	log.Println(ms.Input)
+
+	// call the service
+	req, err := http.NewRequest(
+		"POST",
+		ms.Addr,
+		bytes.NewBuffer(inputPayload),
+	)
+	if err != nil {
+		app.errorJSON(w, err, http.StatusBadRequest)
+		return
+	}
+	req.Header.Add("Content-Type", "application/json")
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		app.errorJSON(w, err, http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	log.Println(resp.Body)
+
+	// make sure we get back the correct status code
+	if resp.StatusCode != ms.ErrCode.ExpectedCode {
+		app.errorJSON(w, ms.ErrCode.Err, ms.ErrCode.ErrCode)
+		return
+	}
+
+	// create a variable we'll read resp.Body into
+	var respPayload jsonResponse
+
+	err = json.NewDecoder(resp.Body).Decode(&respPayload)
+	if err != nil {
+		app.errorJSON(w, err, http.StatusBadRequest)
+		return
+	}
+
+	if respPayload.Error {
+		app.errorJSON(w, errors.New(respPayload.Message))
+		return
+	}
+
+	var payload jsonResponse
+	payload.Error = false
+	payload.Message = ms.SuccessMsg
+	payload.Data = respPayload.Data
+
+	app.writeJSON(w, http.StatusOK, payload)
+}
+
+func (app *Config) logEventViaRabbit(w http.ResponseWriter, l LogPayload) {
+	now := time.Now()
+	l.Data += fmt.Sprintf("Rabbit sent date %d", now.UnixMicro())
+	err := app.pushToQueue(l.Name, l.Data)
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+
+	var payload jsonResponse
+	payload.Error = false
+	payload.Message = "logged via RabbitMQ"
+
+	app.writeJSON(w, http.StatusOK, payload)
+}
+
+func (app *Config) pushToQueue(name, msg string) error {
+	emitter, err := event.NewEmitter(app.Rabbit)
+	if err != nil {
+		return err
+	}
+
+	payload := LogPayload{
+		Name: name,
+		Data: msg,
+	}
+
+	j, _ := json.MarshalIndent(&payload, "", "\t")
+	err = emitter.Push(string(j), "log.INFO")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type RPCPayload struct {
+	Name string
+	Data string
+}
+
+func (app *Config) logItemViaRPC(w http.ResponseWriter, l LogPayload) {
+	client, err := rpc.Dial("tcp", "logger-service:5001")
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+	defer client.Close()
+
+	now := time.Now()
+	l.Data += fmt.Sprintf("RPC sent date %d", now.UnixMicro())
+	rpcPayload := RPCPayload(l)
+
+	var result string
+	err = client.Call("RPCServer.LogInfo", rpcPayload, &result)
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+
+	var payload jsonResponse
+	payload.Error = false
+	payload.Message = "logged via RPC"
+
+	app.writeJSON(w, http.StatusOK, payload)
+}
+
+func (app *Config) LogViaGRPC(w http.ResponseWriter, l LogPayload) {
+	conn, err := grpc.NewClient(
+		"logger-service:50001",
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	)
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+	defer conn.Close()
+
+	now := time.Now()
+	l.Data += fmt.Sprintf("gRPC sent date %d", now.UnixMicro())
+
+	c := logs.NewLogServiceClient(conn)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	_, err = c.WriteLog(ctx, &logs.LogRequest{
+		LogEntry: &logs.Log{
+			Name: l.Name,
+			Data: l.Data,
+		},
+	})
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+
+	var payload jsonResponse
+	payload.Error = false
+	payload.Message = "logged via gRPC"
+
+	app.writeJSON(w, http.StatusOK, payload)
+}

broker-service/cmd/api/main.go

@@ -3,15 +3,32 @@ package main
 import (
 	"fmt"
 	"log"
+	"math"
 	"net/http"
+	"os"
+	"time"
+
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
-const webPort = "4000"
+const webPort = "80"
 
-type Config struct{}
+type Config struct {
+	Rabbit *amqp.Connection
+}
 
 func main() {
-	app := Config{}
+	// 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")
+	app := Config{
+		Rabbit: rabbitConn,
+	}
 
 	log.Printf("Starting broker service on port %s\n", webPort)
 
@@ -21,8 +38,36 @@ func main() {
 		Handler: app.routes(),
 	}
 
-	err := srv.ListenAndServe()
+	err = srv.ListenAndServe()
 	if err != nil {
 		log.Panic(err)
 	}
 }
+
+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@rabbitmq") // 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
+}

broker-service/cmd/api/routes.go

@@ -24,6 +24,7 @@ func (app *Config) routes() http.Handler {
 	mux.Use(middleware.Heartbeat("/ping"))
 
 	mux.Post("/", app.Broker)
+	mux.Post("/handle", app.HandleSubmission)
 
 	return mux
 }

broker-service/event/emitter.go

@@ -0,0 +1,53 @@
+package event
+
+import (
+	"log"
+
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+type Emitter struct {
+	conn *amqp.Connection
+}
+
+func NewEmitter(conn *amqp.Connection) (Emitter, error) {
+	emitter := Emitter{
+		conn: conn,
+	}
+
+	err := emitter.setup()
+	if err != nil {
+		return Emitter{}, err
+	}
+	return emitter, err
+}
+
+func (emitter *Emitter) setup() error {
+	channel, err := emitter.conn.Channel()
+	if err != nil {
+		return err
+	}
+	defer channel.Close()
+
+	return declaireExchange(channel)
+}
+
+func (emitter *Emitter) Push(event string, severity string) error {
+	ch, err := emitter.conn.Channel()
+	if err != nil {
+		return err
+	}
+	defer ch.Close()
+
+	log.Println("Pushing to channel")
+
+	err = ch.Publish("logs_topic", severity, false, false, amqp.Publishing{
+		ContentType: "text/plain",
+		Body:        []byte(event),
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

broker-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
+	)
+}

broker-service/go.mod

@@ -6,3 +6,16 @@ require (
 	github.com/go-chi/chi/v5 v5.1.0
 	github.com/go-chi/cors v1.2.1
 )
+
+require (
+	github.com/rabbitmq/amqp091-go v1.10.0
+	google.golang.org/grpc v1.66.0
+	google.golang.org/protobuf v1.34.1
+)
+
+require (
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 // indirect
+)

broker-service/go.sum

@@ -2,3 +2,21 @@ 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/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+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=
+golang.org/x/net v0.26.0 h1:soB7SVo0PWrY4vPW/+ay0jKDNScG2X9wFeYlXIvJsOQ=
+golang.org/x/net v0.26.0/go.mod h1:5YKkiSynbBIh3p6iOc/vibscux0x38BZDkn8sCUPxHE=
+golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
+golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
+golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 h1:1GBuWVLM/KMVUv1t1En5Gs+gFZCNd360GGb4sSxtrhU=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117/go.mod h1:EfXuqaE1J41VCDicxHzUDm+8rk+7ZdXzHV0IhO/I6s0=
+google.golang.org/grpc v1.66.0 h1:DibZuoBznOxbDQxRINckZcUvnCEvrW9pcWIE2yF9r1c=
+google.golang.org/grpc v1.66.0/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=

broker-service/logs/logs.proto

@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+package logs;
+
+option go_package = "/logs";
+
+message Log {
+    string name = 1;
+    string data = 2;
+}
+
+message LogRequest {
+    Log logEntry = 1;
+}
+
+message LogResponse {
+    string result = 1;
+}
+
+service LogService {
+    rpc WriteLog(LogRequest) returns (LogResponse);
+}
+

front-end/cmd/web/templates/test.page.gohtml

@@ -8,6 +8,12 @@
                 <hr>
 
                 <a id="brokerBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test Broker</a>
+                <a id="authBrokerBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test Auth</a>
+                <a id="logHttpBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test HTTP Log</a>
+                <a id="logRabbitBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test Rabbit Log</a>
+                <a id="logRpcBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test RPC Log</a>
+                <a id="logGrpcBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test gRPC Log</a>
+                <a id="mailBtn" class="btn btn-outline-secondary" href="javascript:void(0);">Test Mail</a>
 
                 <div id="output" class="mt-5" style="outline: 1px solid silver; padding: 2em;">
                     <span class="text-muted">Output shows here...</span>
@@ -34,6 +40,12 @@
 {{define "js"}}
     <script>
         let brokerBtn = document.getElementById("brokerBtn");
+        let authBrokerBtn = document.getElementById("authBrokerBtn");
+        let mailBtn = document.getElementById("mailBtn");
+        let logHttpBtn = document.getElementById("logHttpBtn");
+        let logRabbitBtn = document.getElementById("logRabbitBtn");
+        let logRpcBtn = document.getElementById("logRpcBtn");
+        let logGrpcBtn = document.getElementById("logGrpcBtn");
         let output = document.getElementById("output");
         let sent = document.getElementById("payload");
         let received = document.getElementById("received");
@@ -57,5 +69,200 @@
                     output.innerHTML += "<br><br>Error: " + error;
                 });
         });
+
+        authBrokerBtn.addEventListener("click", () => {
+            const payload = {
+                action: "auth",
+                auth: {
+                    email: "admin@example.com",
+                    password: "verysecret",
+                }
+            };
+            const headers = new Headers();
+            headers.append("Content-Type", "application/json");
+            const body = {
+                method: 'POST',
+                body: JSON.stringify(payload),
+                headers: headers,
+            }
+            fetch("http:\/\/localhost:8080/handle", body)
+            .then((response) => response.json())
+                .then((data) => {
+                    sent.innerHTML = JSON.stringify(payload, undefined, 4);
+                    received.innerHTML = JSON.stringify(data, undefined, 4);
+                    if (data.error) {
+                        console.log(data.message);
+                        output.innerHTML += `<br><strong>Error:</strong>: ${data.message}`;
+                    } else {
+                        output.innerHTML += `<br><strong>Response from broker service</strong>: ${data.message}`;
+                    }
+                })
+                .catch((error) => {
+                    output.innerHTML += "<br><br>Error: " + error;
+                });
+        });
+
+        logHttpBtn.addEventListener("click", () => {
+            const payload = {
+                action: "logHttp",
+                log: {
+                    name: "event",
+                    data: "some kind of data",
+                }
+            };
+            const headers = new Headers();
+            headers.append("Content-Type", "application/json");
+            const body = {
+                method: 'POST',
+                body: JSON.stringify(payload),
+                headers: headers,
+            }
+            fetch("http:\/\/localhost:8080/handle", body)
+            .then((response) => response.json())
+                .then((data) => {
+                    sent.innerHTML = JSON.stringify(payload, undefined, 4);
+                    received.innerHTML = JSON.stringify(data, undefined, 4);
+                    if (data.error) {
+                        console.log(data.message);
+                        output.innerHTML += `<br><strong>Error:</strong>: ${data.message}`;
+                    } else {
+                        output.innerHTML += `<br><strong>Response from broker service</strong>: ${data.message}`;
+                    }
+                })
+                .catch((error) => {
+                    output.innerHTML += "<br><br>Error: " + error;
+                });
+        });
+
+        logRabbitBtn.addEventListener("click", () => {
+            const payload = {
+                action: "logRabbit",
+                log: {
+                    name: "event",
+                    data: "some kind of data",
+                }
+            };
+            const headers = new Headers();
+            headers.append("Content-Type", "application/json");
+            const body = {
+                method: 'POST',
+                body: JSON.stringify(payload),
+                headers: headers,
+            }
+            fetch("http:\/\/localhost:8080/handle", body)
+            .then((response) => response.json())
+                .then((data) => {
+                    sent.innerHTML = JSON.stringify(payload, undefined, 4);
+                    received.innerHTML = JSON.stringify(data, undefined, 4);
+                    if (data.error) {
+                        console.log(data.message);
+                        output.innerHTML += `<br><strong>Error:</strong>: ${data.message}`;
+                    } else {
+                        output.innerHTML += `<br><strong>Response from broker service</strong>: ${data.message}`;
+                    }
+                })
+                .catch((error) => {
+                    output.innerHTML += "<br><br>Error: " + error;
+                });
+        });
+
+        logRpcBtn.addEventListener("click", () => {
+            const payload = {
+                action: "logRpc",
+                log: {
+                    name: "event",
+                    data: "some kind of data",
+                }
+            };
+            const headers = new Headers();
+            headers.append("Content-Type", "application/json");
+            const body = {
+                method: 'POST',
+                body: JSON.stringify(payload),
+                headers: headers,
+            }
+            fetch("http:\/\/localhost:8080/handle", body)
+            .then((response) => response.json())
+                .then((data) => {
+                    sent.innerHTML = JSON.stringify(payload, undefined, 4);
+                    received.innerHTML = JSON.stringify(data, undefined, 4);
+                    if (data.error) {
+                        console.log(data.message);
+                        output.innerHTML += `<br><strong>Error:</strong>: ${data.message}`;
+                    } else {
+                        output.innerHTML += `<br><strong>Response from broker service</strong>: ${data.message}`;
+                    }
+                })
+                .catch((error) => {
+                    output.innerHTML += "<br><br>Error: " + error;
+                });
+        });
+
+        logGrpcBtn.addEventListener("click", () => {
+            const payload = {
+                action: "logGrpc",
+                log: {
+                    name: "event",
+                    data: "some kind of data",
+                }
+            };
+            const headers = new Headers();
+            headers.append("Content-Type", "application/json");
+            const body = {
+                method: 'POST',
+                body: JSON.stringify(payload),
+                headers: headers,
+            }
+            fetch("http:\/\/localhost:8080/handle", body)
+            .then((response) => response.json())
+                .then((data) => {
+                    sent.innerHTML = JSON.stringify(payload, undefined, 4);
+                    received.innerHTML = JSON.stringify(data, undefined, 4);
+                    if (data.error) {
+                        console.log(data.message);
+                        output.innerHTML += `<br><strong>Error:</strong>: ${data.message}`;
+                    } else {
+                        output.innerHTML += `<br><strong>Response from broker service</strong>: ${data.message}`;
+                    }
+                })
+                .catch((error) => {
+                    output.innerHTML += "<br><br>Error: " + error;
+                });
+        });
+
+        mailBtn.addEventListener("click", () => {
+            const payload = {
+                action: "mail",
+                mail: {
+                    from: "admin@example.com",
+                    to: "me@here.com",
+                    subject: "This is not a phishing mail",
+                    content: "Send me money now!",
+                }
+            };
+            const headers = new Headers();
+            headers.append("Content-Type", "application/json");
+            const body = {
+                method: 'POST',
+                body: JSON.stringify(payload),
+                headers: headers,
+            }
+            fetch("http:\/\/localhost:8080/handle", body)
+            .then((response) => response.json())
+                .then((data) => {
+                    sent.innerHTML = JSON.stringify(payload, undefined, 4);
+                    received.innerHTML = JSON.stringify(data, undefined, 4);
+                    if (data.error) {
+                        console.log(data.message);
+                        output.innerHTML += `<br><strong>Error:</strong>: ${data.message}`;
+                    } else {
+                        output.innerHTML += `<br><strong>Response from broker service</strong>: ${data.message}`;
+                    }
+                })
+                .catch((error) => {
+                    output.innerHTML += "<br><br>Error: " + error;
+                });
+        });
+
     </script>
 {{end}}

listener-service/event/consumer.go

@@ -0,0 +1,177 @@
+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
+	}
+	defer channel.Close()
+
+	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/listener-service.dockerfile

@@ -0,0 +1,8 @@
+FROM alpine:latest
+
+RUN mkdir /app
+
+COPY listenerApp /app
+
+CMD ["/app/listenerApp"]
+

listener-service/main.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+	"listener/event"
+	"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
+	log.Println("Listening for and consuming RabbitMQ messages...")
+	// create consumer
+
+	consumer, err := event.NewConsumer(rabbitConn)
+	if err != nil {
+		log.Panic(err)
+	}
+
+	// watch the queue and consume events
+	err = consumer.Listen([]string{"log.INFO", "log.WARNING", "log.ERROR"})
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+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@rabbitmq") // 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
+}

logger-service/cmd/api/grpc.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"logger/data"
+	"logger/logs"
+	"net"
+	"time"
+
+	"google.golang.org/grpc"
+)
+
+type LogServer struct {
+	logs.UnimplementedLogServiceServer
+	Models data.Models
+}
+
+func (l *LogServer) WriteLog(
+	ctx context.Context,
+	req *logs.LogRequest,
+) (*logs.LogResponse, error) {
+	now := time.Now()
+	input := req.GetLogEntry()
+
+	// write the log
+	logEntry := data.LogEntry{
+		Name: input.Name,
+		Data: input.Data,
+	}
+
+	logEntry.Data += fmt.Sprintf(" received date %d", now.UnixMicro())
+	err := l.Models.LogEntry.Insert(logEntry)
+	if err != nil {
+		res := &logs.LogResponse{Result: "failed"}
+		return res, err
+	}
+
+	res := &logs.LogResponse{Result: "logged!"}
+	return res, nil
+}
+
+func (app *Config) gRPCListen() {
+	lis, err := net.Listen("tcp", fmt.Sprintf(":%s", gRpcPort))
+	if err != nil {
+		log.Fatalf("Failed to listen to gRPC %v", err)
+	}
+
+	s := grpc.NewServer()
+
+	logs.RegisterLogServiceServer(s, &LogServer{Models: app.Models})
+
+	log.Printf("gRPC Server started on port %s", gRpcPort)
+
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("Failed to listen to gRPC %v", err)
+	}
+}

logger-service/cmd/api/handlers.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"logger/data"
+	"net/http"
+	"time"
+)
+
+type JSONPayload struct {
+	Name string `json:"name"`
+	Data string `json:"data"`
+}
+
+func (app *Config) WriteLog(w http.ResponseWriter, r *http.Request) {
+	// read json into var
+	now := time.Now()
+	var requestPayload JSONPayload
+	err := app.readJSON(w, r, &requestPayload)
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+	log.Println("requestpayload", requestPayload)
+
+	// insert data
+	event := data.LogEntry{
+		Name: requestPayload.Name,
+		Data: requestPayload.Data,
+	}
+
+	event.Data += fmt.Sprintf(" received date %d", now.UnixMicro())
+
+	log.Println("event", event)
+
+	err = app.Models.LogEntry.Insert(event)
+	if err != nil {
+		app.errorJSON(w, err)
+		return
+	}
+
+	resp := jsonResponse{
+		Error:   false,
+		Message: "logged",
+	}
+
+	app.writeJSON(w, http.StatusAccepted, resp)
+}

logger-service/cmd/api/helpers.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+)
+
+type jsonResponse struct {
+	Error   bool   `json:"error"`
+	Message string `json:"message"`
+	Data    any    `json:"data,omitempty"`
+}
+
+func (app *Config) readJSON(w http.ResponseWriter, r *http.Request, data any) error {
+	maxBytes := 1048576 // one megabyte
+
+	r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes))
+
+	dec := json.NewDecoder(r.Body)
+
+	err := dec.Decode(data)
+	if err != nil {
+		return err
+	}
+
+	err = dec.Decode(&struct{}{})
+	if err != io.EOF {
+		return errors.New("body must have only a single JSON value")
+	}
+
+	return nil
+}
+
+func (app *Config) writeJSON(
+	w http.ResponseWriter,
+	status int,
+	data any,
+	headers ...http.Header,
+) error {
+	out, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	if len(headers) > 0 {
+		for key, value := range headers[0] {
+			w.Header()[key] = value
+		}
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_, err = w.Write(out)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (app *Config) errorJSON(w http.ResponseWriter, err error, status ...int) error {
+	statusCode := http.StatusBadRequest
+
+	if len(status) > 0 {
+		statusCode = status[0]
+	}
+
+	var payload jsonResponse
+	payload.Error = true
+	payload.Message = err.Error()
+
+	return app.writeJSON(w, statusCode, payload)
+}

logger-service/cmd/api/main.go

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"logger/data"
+	"net"
+	"net/http"
+	"net/rpc"
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+const (
+	webPort  = "80"
+	rpcPort  = "5001"
+	mongoURL = "mongodb://mongo:27017"
+	gRpcPort = "50001"
+)
+
+var client *mongo.Client
+
+type Config struct {
+	Models data.Models
+}
+
+func main() {
+	// connect to mongo
+	mongoClient, err := connectToMongo()
+	if err != nil {
+		log.Panic(err)
+	}
+	// create a context in order to disconnect
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	// close connection
+	defer func() {
+		if err = mongoClient.Disconnect(ctx); err != nil {
+			panic(err)
+		}
+	}()
+
+	client = mongoClient
+
+	app := Config{
+		Models: data.New(client),
+	}
+
+	// Register the RPC server
+	err = rpc.Register(new(RPCServer))
+	if err != nil {
+		panic(err)
+	}
+
+	go app.rpcListen()
+
+	go app.gRPCListen()
+
+	// start web server
+	log.Println("Starting service on port", webPort)
+	app.serve()
+}
+
+func (app *Config) serve() {
+	srv := &http.Server{
+		Addr:    fmt.Sprintf(":%s", webPort),
+		Handler: app.routes(),
+	}
+	err := srv.ListenAndServe()
+	if err != nil {
+		log.Panic(err)
+	}
+}
+
+func connectToMongo() (*mongo.Client, error) {
+	clientOptions := options.Client().ApplyURI(mongoURL)
+	clientOptions.SetAuth(options.Credential{
+		Username: "admin",
+		Password: "password",
+	})
+
+	client, err := mongo.Connect(context.TODO(), clientOptions)
+	if err != nil {
+		log.Println("Error connecting:", err)
+		return nil, err
+	}
+
+	var result bson.M
+	if err = client.Database("admin").RunCommand(context.TODO(), bson.D{{Key: "ping", Value: 1}}).Decode(&result); err != nil {
+		log.Println("Error ping:", err)
+		return nil, err
+	}
+
+	log.Println("Connected to Mongo")
+
+	return client, nil
+}
+
+func (app *Config) rpcListen() error {
+	log.Println("Starting RPC server on port ", rpcPort)
+	listen, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%s", rpcPort))
+	if err != nil {
+		return err
+	}
+
+	defer listen.Close()
+	for {
+		rpcConn, err := listen.Accept()
+		if err != nil {
+			continue
+		}
+		go rpc.ServeConn(rpcConn)
+	}
+}

logger-service/cmd/api/routes.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
+)
+
+func (app *Config) routes() http.Handler {
+	mux := chi.NewRouter()
+
+	// specify who is allowed to connect
+	mux.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{"https://*", "http://*"},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: true,
+		MaxAge:           300,
+	}))
+
+	mux.Use(middleware.Heartbeat("/ping"))
+
+	mux.Post("/log", app.WriteLog)
+
+	return mux
+}

logger-service/cmd/api/rpc.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"logger/data"
+	"time"
+)
+
+type RPCServer struct{}
+
+type RPCPayload struct {
+	Name string
+	Data string
+}
+
+func (r *RPCServer) LogInfo(payload RPCPayload, resp *string) error {
+	collection := client.Database("logs").Collection("logs")
+
+	now := time.Now()
+	payload.Data += fmt.Sprintf(" received date %d", now.UnixMicro())
+
+	_, err := collection.InsertOne(context.TODO(), data.LogEntry{
+		Name:      payload.Name,
+		Data:      payload.Data,
+		CreatedAt: time.Now(),
+	})
+	if err != nil {
+		log.Println("error writing to mongo", err)
+		return err
+	}
+
+	*resp = "Processed payload via RPC:" + payload.Name
+
+	return nil
+}

logger-service/data/models.go

@@ -0,0 +1,140 @@
+package data
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+var client *mongo.Client
+
+func New(mongo *mongo.Client) Models {
+	client = mongo
+	return Models{
+		LogEntry: LogEntry{},
+	}
+}
+
+type Models struct {
+	LogEntry LogEntry
+}
+
+type LogEntry struct {
+	ID        string    `bson:"_id,omitempty" json:"id,omitempty"`
+	Name      string    `bson:"name"          json:"name"`
+	Data      string    `bson:"data"          json:"data"`
+	CreatedAt time.Time `bson:"created_at"    json:"created_at"`
+	UpdatedAt time.Time `bson:"updated_at"    json:"updated_at"`
+}
+
+func (l *LogEntry) Insert(entry LogEntry) error {
+	collection := client.Database("logs").Collection("logs")
+
+	newLog := LogEntry{
+		Name:      entry.Name,
+		Data:      entry.Data,
+		CreatedAt: time.Now(),
+		UpdatedAt: time.Now(),
+	}
+	_, err := collection.InsertOne(context.TODO(), newLog)
+	if err != nil {
+		log.Println("Insert error:", err)
+		return err
+	}
+	return nil
+}
+
+func (l *LogEntry) All() ([]*LogEntry, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	collection := client.Database("logs").Collection("logs")
+
+	opts := options.Find()
+	opts.SetSort(bson.D{{Key: "created_at", Value: -1}})
+
+	cursor, err := collection.Find(ctx, bson.D{}, opts)
+	if err != nil {
+		log.Println("Finding all docs error:", err)
+		return nil, err
+	}
+	defer cursor.Close(ctx)
+
+	var logs []*LogEntry
+
+	for cursor.Next(ctx) {
+		var item LogEntry
+
+		err := cursor.Decode(&item)
+		if err != nil {
+			log.Println("Error decoding log into slice:", err)
+			return nil, err
+		}
+		logs = append(logs, &item)
+	}
+	return logs, nil
+}
+
+func (l *LogEntry) GetOne(id string) (*LogEntry, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	collection := client.Database("logs").Collection("logs")
+
+	docID, err := primitive.ObjectIDFromHex(id)
+	if err != nil {
+		return nil, err
+	}
+
+	var entry LogEntry
+	err = collection.FindOne(ctx, bson.M{"_id": docID}).Decode(&entry)
+	if err != nil {
+		return nil, err
+	}
+	return &entry, nil
+}
+
+func (l *LogEntry) DropCollection() error {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	collection := client.Database("logs").Collection("logs")
+
+	if err := collection.Drop(ctx); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (l *LogEntry) Update() (*mongo.UpdateResult, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	collection := client.Database("logs").Collection("logs")
+
+	docID, err := primitive.ObjectIDFromHex(l.ID)
+	if err != nil {
+		return nil, err
+	}
+
+	result, err := collection.UpdateOne(
+		ctx,
+		bson.M{"_id": docID},
+		bson.D{
+			{Key: "$set", Value: bson.D{
+				{Key: "name", Value: l.Name},
+				{Key: "data", Value: l.Data},
+				{Key: "updated_at", Value: time.Now()},
+			}},
+		})
+	if err != nil {
+		return nil, err
+	}
+	return result, nil
+}

logger-service/go.mod

@@ -0,0 +1,27 @@
+module logger
+
+go 1.22.5
+
+require (
+	github.com/go-chi/chi/v5 v5.1.0
+	github.com/go-chi/cors v1.2.1
+	go.mongodb.org/mongo-driver v1.16.1
+	google.golang.org/grpc v1.66.0
+	google.golang.org/protobuf v1.34.1
+)
+
+require (
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/klauspost/compress v1.13.6 // indirect
+	github.com/montanaflynn/stats v0.7.1 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.1.2 // indirect
+	github.com/xdg-go/stringprep v1.0.4 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d // indirect
+	golang.org/x/crypto v0.24.0 // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 // indirect
+)

logger-service/go.sum

@@ -0,0 +1,64 @@
+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/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/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
+github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
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+google.golang.org/grpc v1.66.0 h1:DibZuoBznOxbDQxRINckZcUvnCEvrW9pcWIE2yF9r1c=
+google.golang.org/grpc v1.66.0/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
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logger-service/logger-service.dockerfile

@@ -0,0 +1,7 @@
+FROM alpine:latest
+
+RUN mkdir /app
+
+COPY loggerApp /app
+
+CMD ["/app/loggerApp"]

logger-service/logs/logs.proto

@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+package logs;
+
+option go_package = "/logs";
+
+message Log {
+    string name = 1;
+    string data = 2;
+}
+
+message LogRequest {
+    Log logEntry = 1;
+}
+
+message LogResponse {
+    string result = 1;
+}
+
+service LogService {
+    rpc WriteLog(LogRequest) returns (LogResponse);
+}

mail-service/cmd/api/handlers.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/tsawler/toolbox"
+)
+
+type MailData struct {
+	From    string `json:"from"`
+	To      string `json:"to"`
+	Subject string `json:"subject"`
+	Content string `json:"content"`
+}
+
+func (app *Config) SendMail(w http.ResponseWriter, r *http.Request) {
+	var mailData MailData
+	err := app.Tools.ReadJSON(w, r, &mailData)
+	if err != nil {
+		log.Println(err)
+		app.Tools.ErrorJSON(w, err)
+		return
+	}
+	log.Println("Sending mail")
+
+	if mailData.From == "" || mailData.To == "" ||
+		(mailData.Subject == "" && mailData.Content == "") {
+		log.Println("Invalid mail")
+		app.Tools.ErrorJSON(w, errors.New("invalid mail"), http.StatusBadRequest)
+		return
+	}
+
+	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)
+		return
+	}
+
+	var payload toolbox.JSONResponse
+	payload.Error = false
+	payload.Message = fmt.Sprintf("mail sent to %s", mailData.To)
+
+	app.Tools.WriteJSON(w, http.StatusAccepted, payload)
+}

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

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+
+	"github.com/tsawler/toolbox"
+)
+
+const webPort = "80"
+
+type Config struct {
+	Host       string
+	Port       int
+	UserName   string
+	Password   string
+	Encryption string
+	Tools      toolbox.Tools
+	Mailer     Mail
+}
+
+func main() {
+	app := Config{
+		Mailer: createMail(),
+	}
+
+	log.Printf("Starting mail service on port %s\n", webPort)
+
+	// define http server
+	srv := &http.Server{
+		Addr:    fmt.Sprintf(":%s", webPort),
+		Handler: app.routes(),
+	}
+
+	err := srv.ListenAndServe()
+	if err != nil {
+		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/routes.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
+)
+
+func (app *Config) routes() http.Handler {
+	mux := chi.NewRouter()
+
+	mux.Use(cors.Handler(cors.Options{
+		AllowedOrigins:   []string{"https://*", "http://*"},
+		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		ExposedHeaders:   []string{"Link"},
+		AllowCredentials: true,
+		MaxAge:           300,
+	}))
+
+	mux.Use(middleware.Heartbeat("/ping"))
+
+	mux.Post("/send-mail", app.SendMail)
+	return mux
+}

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

@@ -0,0 +1,22 @@
+module mail
+
+go 1.22.5
+
+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

@@ -0,0 +1,85 @@
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+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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mail-service/mail-service.dockerfile

@@ -0,0 +1,8 @@
+FROM alpine:latest
+
+RUN mkdir /app
+
+COPY mailApp /app
+
+CMD ["/app/mailApp"]
+

project/Makefile

@@ -1,24 +1,28 @@
 FRONT_END_BINARY=frontApp
 BROKER_BINARY=brokerApp
+AUTH_BINARY=authApp
+LOGGER_BINARY=loggerApp
+MAIL_BINARY=mailApp
+LISTENER_BINARY=listenerApp
 
 ## up: starts all containers in the background without forcing build
 up:
 	@echo "Starting Docker images..."
-	sudo docker compose up -d
+	docker compose up -d
 	@echo "Docker images started!"
 
 ## up_build: stops docker-compose (if running), builds all projects and starts docker compose
-up_build: build_broker
+up_build: build_broker build_auth build_logger build_mail build_listener
 	@echo "Stopping docker images (if running...)"
-	sudo docker compose down
+	docker compose down
 	@echo "Building (when required) and starting docker images..."
-	sudo docker compose up --build -d
+	docker compose up --build -d
 	@echo "Docker images built and started!"
 
 ## down: stop docker compose
 down:
 	@echo "Stopping docker compose..."
-	sudo docker compose down
+	docker compose down
 	@echo "Done!"
 
 ## build_broker: builds the broker binary as a linux executable
@@ -27,6 +31,30 @@ build_broker:
 	cd ../broker-service && env GOOS=linux CGO_ENABLED=0 go build -o ${BROKER_BINARY} ./cmd/api
 	@echo "Done!"
 
+## build_auth: builds the auth binary as a linux executable
+build_auth:
+	@echo "Building auth binary..."
+	cd ../authentication-service && env GOOS=linux CGO_ENABLED=0 go build -o ${AUTH_BINARY} ./cmd/api
+	@echo "Done!"
+
+## build_logger: builds the logger binary as a linux executable
+build_logger:
+	@echo "Building logger binary..."
+	cd ../logger-service && env GOOS=linux CGO_ENABLED=0 go build -o ${LOGGER_BINARY} ./cmd/api
+	@echo "Done!"
+
+## build_mail: builds the mail binary as a linux executable
+build_mail:
+	@echo "Building mail binary..."
+	cd ../mail-service && env GOOS=linux CGO_ENABLED=0 go build -o ${MAIL_BINARY} ./cmd/api
+	@echo "Done!"
+
+## build_listener: builds the listener binary as a linux executable
+build_listener:
+	@echo "Building listener binary..."
+	cd ../listener-service && env GOOS=linux CGO_ENABLED=0 go build -o ${LISTENER_BINARY} .
+	@echo "Done!"
+
 ## build_front: builds the frone end binary
 build_front:
 	@echo "Building front end binary..."

project/docker-compose.yml

@@ -5,7 +5,114 @@ services:
       dockerfile: ./../broker-service/broker-service.dockerfile
     restart: always
     ports:
-      - "8080:4000"
+      - "8080:80"
     deploy:
       mode: replicated
       replicas: 1
+
+  authentication-service:
+    build:
+      context: ./../authentication-service/
+      dockerfile: ./../authentication-service/authentication-service.dockerfile
+    ports:
+      - "8081:80"
+    deploy:
+      mode: replicated
+      replicas: 1
+    environment:
+      DSN: "host=postgres port=5432 user=postgres password=password dbname=users timezone=UTC connect_timeout=5"
+
+  logger-service:
+    build:
+      context: ./../logger-service/
+      dockerfile: ./../logger-service/logger-service.dockerfile
+    restart: always
+    deploy:
+      mode: replicated
+      replicas: 1
+
+  mail-service:
+    build:
+      context: ./../mail-service/
+      dockerfile: ./../mail-service/mail-service.dockerfile
+    restart: always
+    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
+
+
+  listener-service:
+    build:
+      context: ./../listener-service/
+      dockerfile: ./../listener-service/listener-service.dockerfile
+    restart: always
+    deploy:
+      mode: replicated
+      replicas: 1
+
+  postgres:
+    image: postgres:16.4-alpine
+    ports:
+      - "5432:5432"
+    restart: always
+    deploy:
+      mode: replicated
+      replicas: 1
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: password
+      POSTGRES_DB: users
+    volumes:
+      - ./db-data/postgres:/var/lib/postgresql/data
+
+  mongo:
+    image: mongo
+    ports:
+      - "27017:27017"
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: admin
+      MONGO_INITDB_ROOT_PASSWORD: password
+    volumes:
+      - ./db-data/mongo:/data/db
+
+  mailhog:
+    image: mailhog/mailhog
+    ports:
+      - "1025:1025"
+      - "8025:8025"
+
+  rabbitmq:
+    image: 'rabbitmq:3.13-alpine'
+    ports:
+      - "5672:5672"
+    deploy:
+      mode: replicated
+      replicas: 1
+    volumes:
+      - ./db-data/rabbitmq:/var/lib/rabbitmq/
+
+  adminer:
+    image: adminer
+    restart: always
+    ports:
+      - 8090:8080
+
+  mongo-express:
+    image: mongo-express
+    restart: always
+    ports:
+      - 8091:8081
+    environment:
+      ME_CONFIG_MONGODB_ADMINUSERNAME: admin
+      ME_CONFIG_MONGODB_ADMINPASSWORD: password
+      ME_CONFIG_MONGODB_URL: mongodb://admin:password@mongo:27017/
+      ME_CONFIG_BASICAUTH: false