fix https://github.com/kataras/iris/issues/1594

HISTORY.md

@@ -359,6 +359,8 @@ Response:
 
 Other Improvements:
 
+- Fix [#1594](https://github.com/kataras/iris/issues/1594) and add a new `PathAfterHandler` which can be set to true to enable the old behavior (not recommended though).
+
 - New [apps](https://github.com/kataras/iris/tree/master/apps) subpackage. [Example of usage](https://github.com/kataras/iris/tree/master/_examples/routing/subdomains/redirect/multi-instances).
 
 ![apps image example](https://user-images.githubusercontent.com/22900943/90459288-8a54f400-e109-11ea-8dea-20631975c9fc.png)
@@ -403,7 +405,7 @@ func main() {
 
 - `Context.OnCloseErr` and `Context.OnConnectionCloseErr` - to call a function of `func() error`  instead of an `iris.Handler` when request is closed or manually canceled.
 
-- `Party.UseError(...Handler)` - to register handlers to run before the `OnErrorCode/OnAnyErrorCode` ones.
+- `Party.UseError(...Handler)` - to register handlers to run before any http errors (e.g. before `OnErrorCode/OnAnyErrorCode` or default error codes when no handler is responsible to handle a specific http status code).
 
 - `Party.UseRouter(...Handler)` - to register handlers before the main router, useful on handlers that should control whether the router itself should ran or not. Independently of the incoming request's method and path values. These handlers will be executed ALWAYS against ALL incoming matched requests. Example of use-case: CORS.
 

core/router/api_builder.go

@@ -952,6 +952,15 @@ func (api *APIBuilder) UseRouter(handlers ...context.Handler) {
 	}
 }
 
+// GetDefaultErrorMiddleware returns the application's error pre handlers
+// registered through `UseError` for the default error handlers.
+// This is used when no matching error handlers registered
+// for a specific status code but `UseError` is called to register a middleware,
+// so the default error handler should make use of those middleware now.
+func (api *APIBuilder) GetDefaultErrorMiddleware() context.Handlers {
+	return api.middlewareErrorCode
+}
+
 // UseError upserts one or more handlers that will be fired,
 // as middleware, before any error handler registered through `On(Any)ErrorCode`.
 // See `OnErrorCode` too.

core/router/handler.go

@@ -48,8 +48,9 @@ type routerHandler struct {
 	trees      []*trie
 	errorTrees []*trie
 
-	hosts      bool // true if at least one route contains a Subdomain.
-	errorHosts bool // true if error handlers are registered to at least one Subdomain.
+	hosts                bool             // true if at least one route contains a Subdomain.
+	errorHosts           bool             // true if error handlers are registered to at least one Subdomain.
+	errorDefaultHandlers context.Handlers // the main handler(s) for default error code handlers, when not registered directly by the end-developer.
 }
 
 var _ RequestHandler = (*routerHandler)(nil)
@@ -122,10 +123,26 @@ type RoutesProvider interface { // api builder
 	// Read `UseRouter` for more.
 	// The map can be altered before router built.
 	GetRouterFilters() map[Party]*Filter
+	// GetDefaultErrorMiddleware should return
+	// the default error handler middleares.
+	GetDefaultErrorMiddleware() context.Handlers
+}
+
+func defaultErrorHandler(ctx *context.Context) {
+	if err := ctx.GetErr(); err != nil {
+		ctx.WriteString(err.Error())
+	} else {
+		ctx.WriteString(context.StatusText(ctx.GetStatusCode()))
+	}
 }
 
 func (h *routerHandler) Build(provider RoutesProvider) error {
 	h.trees = h.trees[0:0] // reset, inneed when rebuilding.
+
+	// set the default error code handler, will be fired on error codes
+	// that are not handled by a specific handler (On(Any)ErrorCode).
+	h.errorDefaultHandlers = append(provider.GetDefaultErrorMiddleware(), defaultErrorHandler)
+
 	rp := errgroup.New("Routes Builder")
 	registeredRoutes := provider.GetRoutes()
 
@@ -560,11 +577,7 @@ func (h *routerHandler) FireErrorCode(ctx *context.Context) {
 	// not error handler found,
 	// see if failed with a stored error, and if so
 	// then render it, otherwise write a default message.
-	if err := ctx.GetErr(); err != nil {
-		ctx.WriteString(err.Error())
-	} else {
-		ctx.WriteString(context.StatusText(statusCode))
-	}
+	ctx.Do(h.errorDefaultHandlers)
 }
 
 func (h *routerHandler) subdomainAndPathAndMethodExists(ctx *context.Context, t *trie, method, path string) bool {

iris.go

@@ -134,9 +134,9 @@ func New() *Application {
 // The return instance recovers on panics and logs the incoming http requests too.
 func Default() *Application {
 	app := New()
-	app.Use(recover.New())
-	app.Use(requestLogger.New())
-	app.Use(Compression)
+	app.UseRouter(recover.New())
+	app.UseRouter(requestLogger.New())
+	app.UseRouter(Compression)
 
 	app.defaultMode = true
 

middleware/logger/config.go

@@ -26,9 +26,17 @@ type Config struct {
 	// Defaults to true.
 	Method bool
 	// Path displays the request path (bool).
+	// See `Query` and `PathAfterHandler` too.
 	//
 	// Defaults to true.
 	Path bool
+	// PathAfterHandler displays the request path
+	// which may be set and modified
+	// after the handler chain is executed.
+	// See `Query` too.
+	//
+	// Defaults to false.
+	PathAfterHandler bool
 
 	// Query will append the URL Query to the Path.
 	// Path should be true too.
@@ -86,16 +94,17 @@ type Config struct {
 // LogFunc and Skippers to nil as well.
 func DefaultConfig() Config {
 	return Config{
-		Status:     true,
-		IP:         true,
-		Method:     true,
-		Path:       true,
-		Query:      false,
-		Columns:    false,
-		LogFunc:    nil,
-		LogFuncCtx: nil,
-		Skippers:   nil,
-		skip:       nil,
+		Status:           true,
+		IP:               true,
+		Method:           true,
+		Path:             true,
+		PathAfterHandler: false,
+		Query:            false,
+		Columns:          false,
+		LogFunc:          nil,
+		LogFuncCtx:       nil,
+		Skippers:         nil,
+		skip:             nil,
 	}
 }
 

middleware/logger/logger.go

@@ -24,6 +24,7 @@ type requestLoggerMiddleware struct {
 // This is for the http requests.
 //
 // Receives an optional configuation.
+// Usage: app.UseRouter(logger.New()).
 func New(cfg ...Config) context.Handler {
 	c := DefaultConfig()
 	if len(cfg) > 0 {
@@ -35,6 +36,13 @@ func New(cfg ...Config) context.Handler {
 	return l.ServeHTTP
 }
 
+func (l *requestLoggerMiddleware) getPath(ctx *context.Context) string {
+	if l.config.Query {
+		return ctx.Request().URL.RequestURI()
+	}
+	return ctx.Path()
+}
+
 // Serve serves the middleware
 func (l *requestLoggerMiddleware) ServeHTTP(ctx *context.Context) {
 	// skip logs and serve the main request immediately
@@ -51,16 +59,7 @@ func (l *requestLoggerMiddleware) ServeHTTP(ctx *context.Context) {
 	var startTime, endTime time.Time
 	startTime = time.Now()
 
-	ctx.Next()
-
-	// no time.Since in order to format it well after
-	endTime = time.Now()
-	latency = endTime.Sub(startTime)
-
-	if l.config.Status {
-		status = strconv.Itoa(ctx.GetStatusCode())
-	}
-
+	// Before Next.
 	if l.config.IP {
 		ip = ctx.RemoteAddr()
 	}
@@ -70,11 +69,21 @@ func (l *requestLoggerMiddleware) ServeHTTP(ctx *context.Context) {
 	}
 
 	if l.config.Path {
-		if l.config.Query {
-			path = ctx.Request().URL.RequestURI()
-		} else {
-			path = ctx.Path()
-		}
+		path = l.getPath(ctx)
+	}
+
+	ctx.Next()
+
+	// no time.Since in order to format it well after
+	endTime = time.Now()
+	latency = endTime.Sub(startTime)
+
+	if l.config.PathAfterHandler /* we don't care if Path is disabled */ {
+		path = l.getPath(ctx)
+	}
+
+	if l.config.Status {
+		status = strconv.Itoa(ctx.GetStatusCode())
 	}
 
 	var message interface{}
@@ -125,12 +134,11 @@ func (l *requestLoggerMiddleware) ServeHTTP(ctx *context.Context) {
 		line += fmt.Sprintf(" %v", headerMessage)
 	}
 
-	// if context.StatusCodeNotSuccessful(ctx.GetStatusCode()) {
-	// 	ctx.Application().Logger().Warn(line)
-	// } else {
-	ctx.Application().Logger().Info(line)
-	// }
-
+	if context.StatusCodeNotSuccessful(ctx.GetStatusCode()) {
+		ctx.Application().Logger().Warn(line)
+	} else {
+		ctx.Application().Logger().Info(line)
+	}
 }
 
 // Columnize formats the given arguments as columns and returns the formatted output,