expand logging

api/api.go

@@ -3,6 +3,7 @@ package api
 import (
 	"flag"
 	"fmt"
+	"log/slog"
 	"net/http"
 
 	"git.dubyatp.xyz/chat-api-server/db"
@@ -14,6 +15,16 @@ import (
 
 var routes = flag.Bool("routes", false, "Generate API route documentation")
 
+func RequestLog(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		slog.Debug("api: request received",
+			"request_uri", r.RequestURI,
+			"source_ip", r.RemoteAddr,
+			"user_agent", r.UserAgent())
+		next.ServeHTTP(w, r)
+	})
+}
+
 func Start() {
 
 	db.InitScyllaDB()
@@ -24,7 +35,7 @@ func Start() {
 	r := chi.NewRouter()
 
 	r.Use(middleware.RequestID)
-	r.Use(middleware.Logger)
+	r.Use(RequestLog)
 	r.Use(middleware.Recoverer)
 	r.Use(middleware.URLFormat)
 	r.Use(render.SetContentType(render.ContentTypeJSON))

api/auth.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"log/slog"
 	"net/http"
 	"time"
 
@@ -45,6 +46,7 @@ func Login(w http.ResponseWriter, r *http.Request) {
 		Secure:   false,
 	})
 
+	slog.Info("auth: login successful", "user", user.Name)
 	w.Write([]byte("Login successful"))
 }
 
@@ -67,28 +69,55 @@ func Logout(w http.ResponseWriter, r *http.Request) {
 	cookie.Expires = time.Now()
 	http.SetCookie(w, cookie)
 
+	slog.Debug("auth: logout successful", "user", username)
 	w.Write([]byte(username + " has been logged out"))
 
 }
 
-var sessionStore = make(map[string]string)
+type Session struct {
+	Token    uuid.UUID
+	Username string
+}
 
 func CreateSession(username string) string {
-	sessionToken := uuid.New().String()
-	sessionStore[sessionToken] = username
-	return sessionToken
+	session := Session{
+		Token:    uuid.New(),
+		Username: username,
+	}
+	dbAddSession(&session)
+	slog.Debug("auth: new session created", "user", session.Username)
+	return session.Token.String()
 }
 
 func ValidateSession(sessionToken string) (string, bool) {
-	username, exists := sessionStore[sessionToken]
-	return username, exists
+	tokenUUID, err := uuid.Parse(sessionToken)
+	if err != nil {
+		return "", false
+	}
+
+	session, err := dbGetSession(tokenUUID)
+	if err != nil {
+		return "", false
+	}
+	slog.Debug("auth: session validated", "user", session.Username)
+	return session.Username, true
 }
 
 func DeleteSession(sessionToken string) (string, bool) {
-	username, exists := sessionStore[sessionToken]
+	tokenUUID, err := uuid.Parse(sessionToken)
+	if err != nil {
+		return "", false
+	}
 
-	delete(sessionStore, username)
-	return username, exists
+	session, err := dbGetSession(tokenUUID)
+	if err != nil {
+		return "", false
+	} else {
+		dbDeleteSession(session.Token)
+	}
+
+	slog.Debug("auth: session deleted", "user", session.Username)
+	return session.Username, true
 }
 
 type contextKey string

api/db.go

@@ -3,34 +3,45 @@ package api
 import (
 	"errors"
 	"fmt"
+	"log/slog"
 
 	"git.dubyatp.xyz/chat-api-server/db"
 	"github.com/gocql/gocql"
+	"github.com/google/uuid"
 )
 
 func dbGetUser(id string) (*User, error) {
 	query := `SELECT id, name, password FROM users WHERE id = ?`
 	var user User
 	err := db.Session.Query(query, id).Scan(&user.ID, &user.Name, &user.Password)
+
 	if err == gocql.ErrNotFound {
+		slog.Debug("db: user not found", "userid", id)
 		return nil, errors.New("User not found")
 	} else if err != nil {
-		return nil, fmt.Errorf("failed to query user: %v", err)
+		slog.Error("db: failed to query user", "error", err)
+		return nil, fmt.Errorf("failed to query user")
 	}
+
+	slog.Debug("db: user found", "userid", user.ID, "username", user.Name)
 	return &user, nil
 }
 
 func dbGetUserByName(username string) (*User, error) {
+	// This will be deprecated soon after implementing https://git.dubyatp.xyz/williamp/chatservice_concept/issues/1
 
 	query := `SELECT id, name, password FROM users WHERE name = ? ALLOW FILTERING`
 	var user User
 	err := db.Session.Query(query, username).Scan(&user.ID, &user.Name, &user.Password)
 	if err == gocql.ErrNotFound {
+		slog.Debug("db: user not found", "username", username)
 		return nil, errors.New("User not found")
 	} else if err != nil {
-		return nil, fmt.Errorf("failed to query user: %v", err)
+		slog.Error("db: failed to query user", "error", err)
+		return nil, fmt.Errorf("failed to query user")
 	}
 
+	slog.Debug("db: user found", "userid", user.ID, "username", user.Name)
 	return &user, nil
 }
 
@@ -49,13 +60,16 @@ func dbGetAllUsers() ([]*User, error) {
 	}
 
 	if err := iter.Close(); err != nil {
-		return nil, fmt.Errorf("failed to iterate users: %v", err)
+		slog.Error("db: failed to iterate users", "error", err)
+		return nil, fmt.Errorf("failed to iterate users")
 	}
 
 	if len(users) == 0 {
+		slog.Debug("db: no users found")
 		return nil, errors.New("no users found")
 	}
 
+	slog.Debug("db: user list returned")
 	return users, nil
 }
 
@@ -69,11 +83,14 @@ func dbGetMessage(id string) (*Message, error) {
 		&message.Timestamp,
 		&message.UserID)
 	if err == gocql.ErrNotFound {
+		slog.Debug("db: message not found", "messageid", id)
 		return nil, errors.New("Message not found")
 	} else if err != nil {
-		return nil, fmt.Errorf("failed to query message: %v", err)
+		slog.Error("db: failed to query message", "error", err)
+		return nil, fmt.Errorf("failed to query message")
 	}
 
+	slog.Debug("db: message found", "messageid", message.ID)
 	return &message, nil
 }
 
@@ -97,22 +114,71 @@ func dbGetAllMessages() ([]*Message, error) {
 	}
 
 	if err := iter.Close(); err != nil {
-		return nil, fmt.Errorf("failed to iterate messages: %v", err)
+		slog.Error("db: failed to iterate messages", "error", err)
+		return nil, fmt.Errorf("failed to iterate messages")
 	}
 
 	if len(messages) == 0 {
+		slog.Debug("db: no messages found")
 		return nil, errors.New("no messages found")
 	}
 
+	slog.Debug("db: message list returned")
 	return messages, nil
 }
 
+func dbAddSession(session *Session) error {
+	query := `INSERT INTO sessions (session_token, username) VALUES (?, ?)`
+	err := db.Session.Query(query, session.Token, session.Username).Exec()
+	if err != nil {
+		slog.Error("db: failed to add session", "error", err)
+		return fmt.Errorf("failed to add session")
+	}
+
+	slog.Debug("db: session added", "username", session.Username)
+	return nil
+}
+
+func dbGetSession(id uuid.UUID) (*Session, error) {
+	query := `SELECT session_token, username FROM sessions WHERE session_token = ?`
+	var session Session
+	err := db.Session.Query(query, id).Scan(
+		&session.Token,
+		&session.Username)
+	if err == gocql.ErrNotFound {
+		slog.Debug("db: session not found")
+		return nil, errors.New("Session not found")
+	} else if err != nil {
+		slog.Error("db: failed to query session", "error", err)
+		return nil, fmt.Errorf("failed to query session")
+	}
+
+	return &session, nil
+}
+
+func dbDeleteSession(id uuid.UUID) error {
+	query := `DELETE FROM sessions WHERE session_token = ?`
+
+	err := db.Session.Query(query, id).Exec()
+
+	if err != nil {
+		slog.Error("db: failed to delete session")
+		return fmt.Errorf("failed to delete session")
+	}
+
+	slog.Debug("db: session deleted")
+	return nil
+}
+
 func dbAddUser(user *User) error {
 	query := `INSERT INTO users (id, name, password) VALUES (?, ?, ?)`
 	err := db.Session.Query(query, user.ID, user.Name, user.Password).Exec()
 	if err != nil {
-		return fmt.Errorf("failed to add user: %v", err)
+		slog.Error("db: failed to add user", "error", err, "userid", user.ID, "username", user.Name)
+		return fmt.Errorf("failed to add user")
 	}
+
+	slog.Debug("db: user added", "userid", user.ID, "username", user.Name)
 	return nil
 }
 
@@ -126,8 +192,11 @@ func dbAddMessage(message *Message) error {
 		message.Timestamp,
 		message.UserID).Exec()
 	if err != nil {
-		return fmt.Errorf("failed to add message: %v", err)
+		slog.Error("db: failed to add message", "error", err, "messageid", message.ID)
+		return fmt.Errorf("failed to add message")
 	}
+
+	slog.Debug("db: message added", "messageid", message.ID)
 	return nil
 }
 
@@ -150,9 +219,11 @@ func dbUpdateMessage(updatedMessage *Message) error {
 		updatedMessage.ID).Exec()
 
 	if err != nil {
-		return fmt.Errorf("failed to update message: %v", err)
+		slog.Error("db: failed to update message", "error", err, "messageid", updatedMessage.ID)
+		return fmt.Errorf("failed to update message")
 	}
 
+	slog.Debug("db: message updated", "messageid", updatedMessage.ID)
 	return nil
 
 }
@@ -163,8 +234,10 @@ func dbDeleteMessage(id string) error {
 	err := db.Session.Query(query, id).Exec()
 
 	if err != nil {
-		return fmt.Errorf("failed to delete message: %v", err)
+		slog.Error("db: failed to delete message", "error", err, "messageid", id)
+		return fmt.Errorf("failed to delete message")
 	}
 
+	slog.Debug("db: message deleted", "messageid", id)
 	return nil
 }

api/message.go

@@ -3,6 +3,7 @@ package api
 import (
 	"context"
 	"encoding/json"
+	"log/slog"
 	"net/http"
 
 	"github.com/go-chi/chi/v5"
@@ -15,91 +16,125 @@ import (
 
 func MessageCtx(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		slog.Debug("message: entering MessageCtx middleware")
 		var message *Message
 		var err error
 
 		if messageID := chi.URLParam(r, "messageID"); messageID != "" {
+			slog.Debug("message: fetching message", "messageID", messageID)
 			message, err = dbGetMessage(messageID)
 		} else {
+			slog.Error("message: messageID not found in URL parameters")
 			render.Render(w, r, ErrNotFound)
 			return
 		}
 		if err != nil {
+			slog.Error("message: failed to fetch message", "messageID", chi.URLParam(r, "messageID"), "error", err)
 			render.Render(w, r, ErrNotFound)
 			return
 		}
 
+		slog.Debug("message: successfully fetched message", "messageID", message.ID)
 		ctx := context.WithValue(r.Context(), messageKey{}, message)
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
+
 func GetMessage(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering GetMessage handler")
 	message, ok := r.Context().Value(messageKey{}).(*Message)
 	if !ok || message == nil {
+		slog.Error("message: message not found in context")
 		render.Render(w, r, ErrNotFound)
 		return
 	}
 
+	slog.Debug("message: rendering message", "messageID", message.ID)
 	if err := render.Render(w, r, NewMessageResponse(message)); err != nil {
+		slog.Error("message: failed to render message response", "messageID", message.ID, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
-
 }
 
 func EditMessage(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering EditMessage handler")
 	message, ok := r.Context().Value(messageKey{}).(*Message)
 	if !ok || message == nil {
+		slog.Error("message: message not found in context")
 		render.Render(w, r, ErrNotFound)
 		return
 	}
 	err := r.ParseMultipartForm(64 << 10)
 	if err != nil {
+		slog.Error("message: failed to parse multipart form", "error", err)
 		http.Error(w, "Unable to parse form", http.StatusBadRequest)
 		return
 	}
 	body := r.FormValue("body")
 	if body == "" {
+		slog.Error("message: message body is empty")
 		http.Error(w, "Message body cannot be empty", http.StatusBadRequest)
 		return
 	}
 
+	slog.Debug("message: updating message", "messageID", message.ID)
 	message.Body = body
 	editedTime := time.Now()
 	message.Edited = &editedTime
 
 	err = dbUpdateMessage(message)
 	if err != nil {
+		slog.Error("message: failed to update message", "messageID", message.ID, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
 
+	slog.Debug("message: successfully updated message", "messageID", message.ID)
 	if err := render.Render(w, r, NewMessageResponse(message)); err != nil {
+		slog.Error("message: failed to render updated message response", "messageID", message.ID, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
 }
 
 func DeleteMessage(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering DeleteMessage handler")
 	message, ok := r.Context().Value(messageKey{}).(*Message)
 	if !ok || message == nil {
+		slog.Error("message: message not found in context")
 		render.Render(w, r, ErrNotFound)
 		return
 	}
-	dbDeleteMessage(message.ID.String())
+
+	slog.Debug("message: deleting message", "messageID", message.ID)
+	err := dbDeleteMessage(message.ID.String())
+	if err != nil {
+		slog.Error("message: failed to delete message", "messageID", message.ID, "error", err)
+		render.Render(w, r, ErrRender(err))
+		return
+	}
+
+	slog.Debug("message: successfully deleted message", "messageID", message.ID)
 	if err := render.Render(w, r, NewMessageResponse(message)); err != nil {
+		slog.Error("message: failed to render deleted message response", "messageID", message.ID, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
 }
 
 func ListMessages(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering ListMessages handler")
 	dbMessages, err := dbGetAllMessages()
 	if err != nil {
+		slog.Error("message: failed to fetch messages", "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
+
+	slog.Debug("message: successfully fetched messages", "count", len(dbMessages))
 	if err := render.RenderList(w, r, NewMessageListResponse(dbMessages)); err != nil {
+		slog.Error("message: failed to render message list response", "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
@@ -110,23 +145,19 @@ func newMessageID() uuid.UUID {
 }
 
 func NewMessage(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("message: entering NewMessage handler")
 	err := r.ParseMultipartForm(64 << 10)
 	if err != nil {
+		slog.Error("message: failed to parse multipart form", "error", err)
 		http.Error(w, "Unable to parse form", http.StatusBadRequest)
 		return
 	}
 
-	// userID := r.FormValue("user_id")
-	//if userID == "" {
-	//	http.Error(w, "Invalid user ID", http.StatusBadRequest)
-	//	return
-	//}
-
 	var user = r.Context().Value(userKey{}).(*User)
-
 	body := r.FormValue("body")
 
 	if body == "" {
+		slog.Error("message: message body is empty")
 		http.Error(w, "Invalid body", http.StatusBadRequest)
 		return
 	}
@@ -138,12 +169,15 @@ func NewMessage(w http.ResponseWriter, r *http.Request) {
 		Timestamp: time.Now(),
 	}
 
+	slog.Debug("message: creating new message", "messageID", msg.ID)
 	err = dbAddMessage(&msg)
 	if err != nil {
+		slog.Error("message: failed to add new message", "messageID", msg.ID, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
 
+	slog.Debug("message: successfully created new message", "messageID", msg.ID)
 	render.Render(w, r, NewMessageResponse(&msg))
 }
 

api/user.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"log/slog"
 	"net/http"
 
 	"github.com/go-chi/chi/v5"
@@ -11,79 +12,96 @@ import (
 
 func UserCtx(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		slog.Debug("user: entering UserCtx middleware")
 		var user *User
 		var err error
 
 		if userID := chi.URLParam(r, "userID"); userID != "" {
+			slog.Debug("user: fetching user", "userID", userID)
 			user, err = dbGetUser(userID)
 		} else {
+			slog.Error("user: userID not found in URL parameters")
 			render.Render(w, r, ErrNotFound)
 			return
 		}
 		if err != nil {
+			slog.Error("user: failed to fetch user", "userID", user.ID, "error", err)
 			render.Render(w, r, ErrNotFound)
 			return
 		}
 
+		slog.Debug("user: successfully fetched user", "userID", user.ID)
 		ctx := context.WithValue(r.Context(), userKey{}, user)
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
 
 func Whoami(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("user: entering Whoami handler")
 	user, ok := r.Context().Value(userKey{}).(*User)
 	if !ok || user == nil {
-		// Anonymous user
+		slog.Debug("user: anonymous user")
 		w.Write([]byte("anonymous"))
 		return
 	}
 
+	slog.Debug("user: returning user name", "userID", user.ID, "userName", user.Name)
 	w.Write([]byte(user.Name))
 }
 
 func LoginCtx(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		// Try to retrieve username from context
+		slog.Debug("user: entering LoginCtx middleware")
 		username, ok := r.Context().Value(usernameKey).(string)
 		if !ok || username == "" {
-			// No username provided, assume it's an anonymous user
+			slog.Debug("user: no username provided, assuming anonymous user")
 			next.ServeHTTP(w, r)
 			return
 		}
 
-		// Lookup user in the database
+		slog.Debug("user: fetching user by username", "username", username)
 		user, err := dbGetUserByName(username)
 		if err != nil {
-			// If user is specified and not found, throw an error
+			slog.Error("user: failed to fetch user by username", "username", username, "error", err)
 			render.Render(w, r, ErrNotFound)
 			return
 		}
 
+		slog.Debug("user: successfully fetched user", "userID", user.ID, "username", user.Name)
 		ctx := context.WithValue(r.Context(), userKey{}, user)
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }
 
 func GetUser(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("user: entering GetUser handler")
 	user, ok := r.Context().Value(userKey{}).(*User)
 	if !ok || user == nil {
+		slog.Error("user: user not found in context")
 		render.Render(w, r, ErrNotFound)
 		return
 	}
 
+	slog.Debug("user: rendering user", "userID", user.ID, "userName", user.Name)
 	if err := render.Render(w, r, NewUserPayloadResponse(user)); err != nil {
+		slog.Error("user: failed to render user response", "userID", user.ID, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
 }
 
 func ListUsers(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("user: entering ListUsers handler")
 	dbUsers, err := dbGetAllUsers()
 	if err != nil {
+		slog.Error("user: failed to fetch users", "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
+
+	slog.Debug("user: successfully fetched users", "count", len(dbUsers))
 	if err := render.RenderList(w, r, NewUserListResponse(dbUsers)); err != nil {
+		slog.Error("user: failed to render user list response", "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
@@ -94,8 +112,10 @@ func newUserID() uuid.UUID {
 }
 
 func NewUser(w http.ResponseWriter, r *http.Request) {
+	slog.Debug("user: entering NewUser handler")
 	err := r.ParseMultipartForm(64 << 10)
 	if err != nil {
+		slog.Error("user: failed to parse multipart form", "error", err)
 		http.Error(w, "Unable to parse form", http.StatusBadRequest)
 		return
 	}
@@ -103,13 +123,17 @@ func NewUser(w http.ResponseWriter, r *http.Request) {
 	newUserName := r.FormValue("name")
 	password := r.FormValue("password")
 	if newUserName == "" || password == "" {
+		slog.Error("user: username or password is empty")
 		http.Error(w, "Username and password cannot be empty", http.StatusBadRequest)
 		return
 	}
 
+	slog.Debug("user: hashing password for new user", "userName", newUserName)
 	hashedPassword, err := hashPassword(password)
 	if err != nil {
+		slog.Error("user: failed to hash password", "error", err)
 		http.Error(w, "Unable to hash password", http.StatusInternalServerError)
+		return
 	}
 
 	newUser := User{
@@ -118,12 +142,15 @@ func NewUser(w http.ResponseWriter, r *http.Request) {
 		Password: hashedPassword,
 	}
 
+	slog.Debug("user: adding new user to database", "userID", newUser.ID, "userName", newUser.Name)
 	err = dbAddUser(&newUser)
 	if err != nil {
+		slog.Error("user: failed to add new user", "userID", newUser.ID, "userName", newUser.Name, "error", err)
 		render.Render(w, r, ErrRender(err))
 		return
 	}
 
+	slog.Debug("user: successfully added new user", "userID", newUser.ID, "userName", newUser.Name)
 	render.Render(w, r, NewUserPayloadResponse(&newUser))
 }
 

db/scylla.go

@@ -1,7 +1,7 @@
 package db
 
 import (
-	"log"
+	"log/slog"
 	"os"
 
 	"github.com/gocql/gocql"
@@ -16,10 +16,11 @@ func InitScyllaDB() {
 
 	session, err := cluster.CreateSession()
 	if err != nil {
-		log.Fatalf("Failed to connect to ScyllaDB: %v", err)
+		slog.Error("Failed to connect to ScyllaDB", "error", err)
+		os.Exit(1)
 	}
 	Session = session
-	log.Println("Connected to ScyllaDB")
+	slog.Info("Connected to ScyllaDB")
 }
 
 func CloseScyllaDB() {

log/log.go

@@ -0,0 +1,31 @@
+package log
+
+import (
+	"flag"
+	"log/slog"
+	"os"
+)
+
+func Logger() {
+	// Get logger arguments
+	var loglevelStr string
+	flag.StringVar(&loglevelStr, "loglevel", "ERROR", "set log level")
+	flag.Parse()
+
+	loglevel := new(slog.LevelVar)
+	if loglevelStr == "DEBUG" {
+		loglevel.Set(slog.LevelDebug)
+	} else if loglevelStr == "INFO" {
+		loglevel.Set(slog.LevelInfo)
+	} else if loglevelStr == "WARN" {
+		loglevel.Set(slog.LevelWarn)
+	} else {
+		loglevel.Set(slog.LevelError)
+	}
+	// Start logger
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+		Level: loglevel,
+	}))
+	slog.SetDefault(logger)
+	slog.Debug("Logging started", "level", loglevel)
+}

main.go

@@ -1,22 +1,43 @@
 package main
 
 import (
-	"log"
+	"log/slog"
 	"os"
 
 	"git.dubyatp.xyz/chat-api-server/api"
+	"git.dubyatp.xyz/chat-api-server/log"
 	"github.com/joho/godotenv"
 )
 
+func checkEnvVars(keys []string) (bool, []string) {
+	var missing []string
+	for _, key := range keys {
+		if _, ok := os.LookupEnv(key); !ok {
+			missing = append(missing, key)
+		}
+	}
+	return len(missing) == 0, missing
+}
+
 func main() {
+
+	log.Logger() // initialize logger
+
+	requiredEnvVars := []string{"SCYLLA_CLUSTER", "SCYLLA_KEYSPACE"}
+
 	// Initialize dotenv file
 	err := godotenv.Load()
 	if err != nil {
-		// Check if environment variables are defined by OS before erroring out
-		_, exists := os.LookupEnv("SCYLLA_CLUSTER")
-		if !exists {
-			log.Fatal("Required environment variables are not added, and no .env file was found")
-		}
+		slog.Info("No .env file loaded, will try OS environment variables")
 	}
+
+	// Check if environment variables were defined by the OS before erroring out
+	exists, missingVars := checkEnvVars(requiredEnvVars)
+	if !exists {
+		slog.Error("Missing environment variables", "missing", missingVars)
+		os.Exit(1)
+	}
+
+	slog.Info("Starting the API Server...")
 	api.Start()
 }