package main import ( library "git.ailur.dev/ailur/fg-library/v2" "errors" "io" "io/fs" "log" "os" "plugin" "sort" "strings" "sync" "time" "compress/gzip" "database/sql" "encoding/json" "log/slog" "net/http" "path/filepath" "github.com/andybalholm/brotli" "github.com/go-chi/chi/v5" "github.com/go-chi/hostrouter" "github.com/go-playground/validator/v10" "github.com/google/uuid" "github.com/klauspost/compress/zstd" _ "github.com/lib/pq" _ "github.com/mattn/go-sqlite3" ) type Config struct { Global struct { IP string `json:"ip" validate:"required,ip_addr"` Port string `json:"port" validate:"required"` ServiceDirectory string `json:"serviceDirectory" validate:"required"` ResourceDirectory string `json:"resourceDirectory" validate:"required"` Compression string `json:"compression" validate:"omitempty,oneof=gzip brotli zstd"` CompressionLevelJN json.Number `json:"compressionLevel" validate:"required_with=Compression"` CompressionLevel int } `json:"global" validate:"required"` Logging struct { Enabled bool `json:"enabled"` File string `json:"file" validate:"required_if=Enabled true"` } `json:"logging"` Database struct { DatabaseType string `json:"databaseType" validate:"required,oneof=sqlite postgres"` ConnectionString string `json:"connectionString" validate:"required_if=DatabaseType postgres"` DatabasePath string `json:"databasePath" validate:"required_if=DatabaseType sqlite"` } `json:"database" validate:"required"` Static []struct { Subdomain string `json:"subdomain"` Directory string `json:"directory" validate:"required,isDirectory"` Pattern string `json:"pattern"` } `json:"static"` Services map[string]interface{} `json:"services"` } type Service struct { ServiceID uuid.UUID ServiceMetadata library.Service Inbox chan library.InterServiceMessage } type ResponseWriterWrapper struct { http.ResponseWriter io.Writer } func (w *ResponseWriterWrapper) WriteHeader(statusCode int) { w.ResponseWriter.WriteHeader(statusCode) } func (w *ResponseWriterWrapper) Write(p []byte) (int, error) { return w.Writer.Write(p) } var ( logger = func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { next.ServeHTTP(w, r) slog.Info(r.Method + " " + r.URL.Path) }) } serverChanger = func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Server", "Fulgens HTTP Server") next.ServeHTTP(w, r) }) } gzipHandler = func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") { gzipWriter, err := gzip.NewWriterLevel(w, config.Global.CompressionLevel) if err != nil { slog.Error("Error creating gzip writer: ", err) next.ServeHTTP(w, r) return } if w.Header().Get("Content-Encoding") != "" { w.Header().Set("Content-Encoding", w.Header().Get("Content-Encoding")+", gzip") } else { w.Header().Set("Content-Encoding", "gzip") } defer func() { w.Header().Del("Content-Length") err := gzipWriter.Close() if errors.Is(err, http.ErrBodyNotAllowed) { // This is fine, all it means is that they have it cached, and we don't need to send it return } else if err != nil { slog.Error("Error closing gzip writer: ", err) } }() gzipResponseWriter := &ResponseWriterWrapper{ResponseWriter: w, Writer: gzipWriter} next.ServeHTTP(gzipResponseWriter, r) } else { next.ServeHTTP(w, r) } }) } brotliHandler = func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if strings.Contains(r.Header.Get("Accept-Encoding"), "br") { brotliWriter := brotli.NewWriterV2(w, config.Global.CompressionLevel) if w.Header().Get("Content-Encoding") != "" { w.Header().Set("Content-Encoding", w.Header().Get("Content-Encoding")+", br") } else { w.Header().Set("Content-Encoding", "br") } defer func() { w.Header().Del("Content-Length") err := brotliWriter.Close() if errors.Is(err, http.ErrBodyNotAllowed) { // This is fine, all it means is that they have it cached, and we don't need to send it return } else if err != nil { slog.Error("Error closing Brotli writer: ", err) } }() brotliResponseWriter := &ResponseWriterWrapper{ResponseWriter: w, Writer: brotliWriter} next.ServeHTTP(brotliResponseWriter, r) } else { next.ServeHTTP(w, r) } }) } zStandardHandler = func(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if strings.Contains(r.Header.Get("Accept-Encoding"), "zstd") { zStandardWriter, err := zstd.NewWriter(w, zstd.WithEncoderLevel(zstd.EncoderLevelFromZstd(config.Global.CompressionLevel))) if err != nil { slog.Error("Error creating ZStandard writer: ", err) next.ServeHTTP(w, r) return } if w.Header().Get("Content-Encoding") != "" { w.Header().Set("Content-Encoding", w.Header().Get("Content-Encoding")+", zstd") } else { w.Header().Set("Content-Encoding", "zstd") } defer func() { w.Header().Del("Content-Length") err := zStandardWriter.Close() if err != nil { if errors.Is(err, http.ErrBodyNotAllowed) { // This is fine, all it means is that they have it cached, and we don't need to send it return } else { slog.Error("Error closing ZStandard writer: ", err) } } }() gzipResponseWriter := &ResponseWriterWrapper{ResponseWriter: w, Writer: zStandardWriter} next.ServeHTTP(gzipResponseWriter, r) } else { next.ServeHTTP(w, r) } }) } validate *validator.Validate services = make(map[uuid.UUID]Service) lock sync.RWMutex hostRouter = hostrouter.New() config Config ) func processInterServiceMessage(channel chan library.InterServiceMessage) { for { message := <-channel if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000000") { // Broadcast message for _, service := range services { service.Inbox <- message } } else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000001") { // Service initialization service switch message.MessageType { case 0: // This has been deprecated, ignore it // Send "true" back services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 0, SentAt: time.Now(), Message: true, } case 1: // Service database initialization message // Check if the service has the necessary permissions if services[message.ServiceID].ServiceMetadata.Permissions.Database { // Check if we are using sqlite or postgres if config.Database.DatabaseType == "sqlite" { // Open the database and return the connection pluginConn, err := sql.Open("sqlite3", filepath.Join(config.Database.DatabasePath, message.ServiceID.String()+".db")) if err != nil { // Report an error services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: err, } } else { // Report a successful activation services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 2, SentAt: time.Now(), Message: library.Database{ DB: pluginConn, DBType: library.Sqlite, }, } } } else if config.Database.DatabaseType == "postgres" { // Connect to the database conn, err := sql.Open("postgres", config.Database.ConnectionString) if err != nil { // Report an error services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: err, } } else { // Try to create the schema _, err = conn.Exec("CREATE SCHEMA IF NOT EXISTS \"" + message.ServiceID.String() + "\"") if err != nil { // Report an error services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: err, } } else { // Create a new connection to the database var connectionString string if strings.Contains(config.Database.ConnectionString, "?") { connectionString = config.Database.ConnectionString + "&search_path=\"" + message.ServiceID.String() + "\"" } else { connectionString = config.Database.ConnectionString + "?search_path=\"" + message.ServiceID.String() + "\"" } pluginConn, err := sql.Open("postgres", connectionString) if err != nil { // Report an error services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: err, } } else { // Test the connection err = pluginConn.Ping() if err != nil { // Report an error services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: err, } } else { // Report a successful activation services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 2, SentAt: time.Now(), Message: library.Database{ DB: pluginConn, DBType: library.Postgres, }, } } } } } } } else { // Report an error services[message.ServiceID].Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("database access not permitted"), } } } } else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000002") { // Logger service service, ok := services[message.ServiceID] if ok { switch message.MessageType { case 0: // Log message slog.Info(service.ServiceMetadata.Name + " says: " + message.Message.(string)) case 1: // Warn message slog.Warn(service.ServiceMetadata.Name + " warns: " + message.Message.(string)) case 2: // Error message slog.Error(service.ServiceMetadata.Name + " complains: " + message.Message.(string)) case 3: // Fatal message slog.Error(service.ServiceMetadata.Name + "'s dying wish: " + message.Message.(string)) os.Exit(1) } } } else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000003") { // We need to check if the service is allowed to access the Blob Storage service serviceMetadata, ok := services[message.ServiceID] if ok && serviceMetadata.ServiceMetadata.Permissions.BlobStorage { // Send message to Blob Storage service service, ok := services[uuid.MustParse("00000000-0000-0000-0000-000000000003")] if ok { service.Inbox <- message } else if !ok { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("blob storage service not found"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } else { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("blob storage is not yet available"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } } else { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("blob storage is not permitted"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } } else if message.ForServiceID == uuid.MustParse("00000000-0000-0000-0000-000000000004") { // We need to check if the service is allowed to access the Authentication service serviceMetadata, ok := services[message.ServiceID] if ok && serviceMetadata.ServiceMetadata.Permissions.Authenticate { // Send message to Authentication service service, ok := services[uuid.MustParse("00000000-0000-0000-0000-000000000004")] if ok { service.Inbox <- message } else if !ok { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("authentication service not found"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } else { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("authentication service not yet available"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } } else { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("authentication not permitted"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } } else { serviceMetadata, ok := services[message.ServiceID] if ok && serviceMetadata.ServiceMetadata.Permissions.InterServiceCommunication { // Send message to specific service service, ok := services[message.ForServiceID] if !ok { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("requested service not found"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } service.Inbox <- message } else { // Send error message service, ok := services[message.ServiceID] if ok { service.Inbox <- library.InterServiceMessage{ ServiceID: uuid.MustParse("00000000-0000-0000-0000-000000000001"), ForServiceID: message.ServiceID, MessageType: 1, SentAt: time.Now(), Message: errors.New("inter-service communication not permitted"), } } else { // This should never happen slog.Error("Bit flip error: Impossible service ID. Move away from radiation or use ECC memory.") os.Exit(1) } } } } } func parseConfig(path string) Config { // Register the custom validators validate = validator.New() // Register the custom isDirectory validator err := validate.RegisterValidation("isDirectory", func(fl validator.FieldLevel) bool { // Check if it exists fileInfo, err := os.Stat(fl.Field().String()) if err != nil { return false } // Check if it is a directory return fileInfo.IsDir() }) if err != nil { slog.Error("Error registering custom validator: ", err) os.Exit(1) } // Parse the configuration file configFile, err := os.Open(path) if err != nil { slog.Error("Error reading configuration file: ", err) os.Exit(1) } // Parse the configuration file var config Config decoder := json.NewDecoder(configFile) decoder.UseNumber() err = decoder.Decode(&config) if err != nil { slog.Error("Error parsing configuration file: ", err) os.Exit(1) } // Set the compression level if config.Global.Compression != "" { compressionLevelI64, err := config.Global.CompressionLevelJN.Int64() if err != nil { slog.Error("Error parsing compression level: ", err) os.Exit(1) } config.Global.CompressionLevel = int(compressionLevelI64) } // Validate the configuration err = validate.Struct(config) if err != nil { slog.Error("Invalid configuration: ", err) os.Exit(1) } // Check if we are logging to a file if config.Logging != (Config{}.Logging) && config.Logging.Enabled { // Check if the log file is set logFilePath := config.Logging.File // Set the log file logFile, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) if err != nil { slog.Error("Error opening log file: ", err) os.Exit(1) } log.SetOutput(io.MultiWriter(os.Stdout, logFile)) } return config } func main() { // Parse the configuration file if len(os.Args) < 2 { info, err := os.Stat("config.json") if err != nil { if errors.Is(err, os.ErrNotExist) { slog.Error("No configuration file provided") os.Exit(1) } else { slog.Error("Error reading configuration file: ", err) os.Exit(1) } } if info.IsDir() { slog.Error("No configuration file provided") os.Exit(1) } config = parseConfig("config.json") } else { config = parseConfig(os.Args[1]) } // If we are using sqlite, create the database directory if it does not exist if config.Database.DatabaseType == "sqlite" { err := os.MkdirAll(config.Database.DatabasePath, 0755) if err != nil { slog.Error("Error creating database directory: ", err) os.Exit(1) } } // Create the router router := chi.NewRouter() router.Use(logger) router.Use(serverChanger) // Iterate through the service configurations and create routers for each unique subdomain subdomains := make(map[string]*chi.Mux) for _, service := range config.Services { if service.(map[string]interface{})["subdomain"] != nil { subdomain := service.(map[string]interface{})["subdomain"].(string) if subdomains[subdomain] == nil { subdomains[subdomain] = chi.NewRouter() slog.Info("Mapping subdomain " + subdomain) hostRouter.Map(subdomain, subdomains[subdomain]) } } } // Iterate through the static configurations and create routers for each unique subdomain for _, static := range config.Static { // Check if it wants a subdomain if static.Subdomain != "" { // Check if the subdomain exists if subdomains[static.Subdomain] == nil { subdomains[static.Subdomain] = chi.NewRouter() slog.Info("Mapping subdomain " + static.Subdomain) hostRouter.Map(static.Subdomain, subdomains[static.Subdomain]) } } } var globalOutbox = make(chan library.InterServiceMessage) // Initialize the service discovery, health-check, and logging services // Since these are core services, always allocate them the service IDs 0, 1, and 2 // These are not dynamically loaded, as they are integral to the system functioning go processInterServiceMessage(globalOutbox) // Initialize all the services plugins := make(map[time.Time]string) err := filepath.Walk(config.Global.ServiceDirectory, func(path string, info os.FileInfo, err error) error { if err != nil { return err } if info.IsDir() || filepath.Ext(path) != ".fgs" { return nil } // Add the plugin to the list of plugins if info.Name() == "storage.fgs" { plugins[time.Unix(0, 0)] = path return nil } else if info.Name() == "auth.fgs" { plugins[time.Unix(0, 1)] = path return nil } plugins[info.ModTime()] = path return nil }) if err != nil { slog.Error("Error walking the services directory: ", err) os.Exit(1) } // Sort the plugins by modification time, newest last var keys []time.Time for k := range plugins { keys = append(keys, k) } sort.Slice(keys, func(i, j int) bool { return keys[i].Before(keys[j]) }) for _, k := range keys { // Get the plugin path pluginPath := plugins[k] // Load the plugin servicePlugin, err := plugin.Open(pluginPath) if err != nil { slog.Error("Could not load service: ", err) os.Exit(1) } // Load the service information serviceInformationSymbol, err := servicePlugin.Lookup("ServiceInformation") if err != nil { slog.Error("Service lacks necessary information: ", err) os.Exit(1) } serviceInformation := *serviceInformationSymbol.(*library.Service) // Load the main function main, err := servicePlugin.Lookup("Main") if err != nil { slog.Error("Service lacks necessary main function: ", err) os.Exit(1) } // Initialize the service var inbox = make(chan library.InterServiceMessage) lock.Lock() services[serviceInformation.ServiceID] = Service{ ServiceID: serviceInformation.ServiceID, Inbox: inbox, ServiceMetadata: serviceInformation, } lock.Unlock() slog.Info("Activating service " + serviceInformation.Name + " with ID " + serviceInformation.ServiceID.String()) // Make finalRouter a subdomain router if necessary var finalRouter *chi.Mux if config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{})["subdomain"] != nil { finalRouter = subdomains[config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{})["subdomain"].(string)] } else { finalRouter = router } // Check if they want a resource directory var resourceDir fs.FS = nil if serviceInformation.Permissions.Resources { resourceDir = os.DirFS(filepath.Join(config.Global.ResourceDirectory, serviceInformation.ServiceID.String())) } main.(func(library.ServiceInitializationInformation))(library.ServiceInitializationInformation{ Domain: serviceInformation.Name, Configuration: config.Services[strings.ToLower(serviceInformation.Name)].(map[string]interface{}), Outbox: globalOutbox, Inbox: inbox, ResourceDir: resourceDir, Router: finalRouter, }) // Log the service activation slog.Info("Service " + serviceInformation.Name + " activated with ID " + serviceInformation.ServiceID.String()) } // Mount the host router router.Mount("/", hostRouter) slog.Info("All subdomains mapped") // Initialize the static file servers for _, static := range config.Static { if static.Subdomain != "" { // Serve the static directory if static.Pattern != "" { subdomains[static.Subdomain].Handle(static.Pattern, http.FileServerFS(os.DirFS(static.Directory))) slog.Info("Serving static directory " + static.Directory + " on subdomain " + static.Subdomain + " with pattern " + static.Pattern) } else { subdomains[static.Subdomain].Handle("/*", http.FileServerFS(os.DirFS(static.Directory))) slog.Info("Serving static directory " + static.Directory + " on subdomain " + static.Subdomain) } } else { // Serve the static directory if static.Pattern != "" { router.Handle(static.Pattern, http.FileServerFS(os.DirFS(static.Directory))) slog.Info("Serving static directory " + static.Directory + " with pattern " + static.Pattern) } else { router.Handle("/*", http.FileServerFS(os.DirFS(static.Directory))) slog.Info("Serving static directory " + static.Directory) } } } // Start the server slog.Info("Starting server on " + config.Global.IP + ":" + config.Global.Port) switch config.Global.Compression { case "": err = http.ListenAndServe(config.Global.IP+":"+config.Global.Port, router) case "gzip": slog.Info("GZip compression enabled") err = http.ListenAndServe(config.Global.IP+":"+config.Global.Port, gzipHandler(router)) case "brotli": slog.Info("Brotli compression enabled") err = http.ListenAndServe(config.Global.IP+":"+config.Global.Port, brotliHandler(router)) case "zstd": slog.Info("ZStandard compression enabled") err = http.ListenAndServe(config.Global.IP+":"+config.Global.Port, zStandardHandler(router)) } if err != nil { slog.Error("Error starting server: ", err) os.Exit(1) } }