new Timeout, TimeoutMessage configuration fields and apps.OnApplicationRegistered listener

HISTORY.md

@@ -28,6 +28,10 @@ The codebase for Dependency Injection, Internationalization and localization and
 
 ## Fixes and Improvements
 
+- New `Configuration.Timeout` and `Configuration.TimeoutMessage` fields. Use it to set HTTP timeouts. Note that your http server's (`Application.ConfigureHost`) Read/Write timeouts should be a bit higher than the `Configuration.Timeout` in order to give some time to http timeout handler to kick in and be able to send the `Configuration.TimeoutMessage` properly.
+
+- New `apps.OnApplicationRegistered` method which listens on new Iris applications hosted under the same binary. Use it on your `init` functions to configure Iris applications by any spot in your project's files.
+
 - `Context.JSON` respects any object implements the `easyjson.Marshaler` interface and renders the result using the [easyjon](https://github.com/mailru/easyjson)'s writer.
 
 - minor: `Context` structure implements the standard go Context interface now (includes: Deadline, Done, Err and Value methods). Handlers can now just pass the `ctx iris.Context` as a shortcut of `ctx.Request().Context()` when needed.

apps/apps.go

@@ -48,3 +48,15 @@ func GetAll() []*iris.Application {
 
 	return apps
 }
+
+// OnApplicationRegistered adds a function which fires when a new application
+// is registered.
+func OnApplicationRegistered(listeners ...func(app *iris.Application)) {
+	appListeners := make([]func(context.Application), 0, len(listeners))
+	for i := range listeners {
+		appListeners = append(appListeners, func(ctxApp context.Application) {
+			listeners[i](ctxApp.(*iris.Application))
+		})
+	}
+	context.OnApplicationRegistered(appListeners...)
+}

configuration.go

@@ -208,6 +208,14 @@ func WithKeepAlive(keepAliveDur time.Duration) Configurator {
 	}
 }
 
+// WithTimeout sets the `Configuration.Timeout` field to the given duration.
+func WithTimeout(timeoutDur time.Duration, htmlBody string) Configurator {
+	return func(app *Application) {
+		app.config.Timeout = timeoutDur
+		app.config.TimeoutMessage = htmlBody
+	}
+}
+
 // WithoutServerError will cause to ignore the matched "errors"
 // from the main application's `Run/Listen` function.
 //
@@ -498,7 +506,6 @@ func WithSitemap(startURL string) Configurator {
 					} else {
 						href = "/" + langPath + loc
 					}
-
 				} else if app.I18n.Subdomain {
 					// then use the subdomain.
 					// e.g. http://el.domain.com/path
@@ -627,6 +634,17 @@ type Configuration struct {
 	//
 	// Defaults to 0.
 	KeepAlive time.Duration `ini:"keepalive" json:"keepAlive" yaml:"KeepAlive" toml:"KeepAlive" env:"KEEP_ALIVE"`
+	// Timeout wraps the application's router with an http timeout handler
+	// if the value is greater than zero.
+	//
+	// The underline response writer supports the Pusher interface but does not support
+	// the Hijacker or Flusher interfaces when Timeout handler is registered.
+	//
+	// Read more at: https://pkg.go.dev/net/http#TimeoutHandler.
+	Timeout time.Duration `ini:"timeout" json:"timeout" yaml:"Timeout" toml:"Timeout"`
+	// TimeoutMessage specifies the HTML body when a handler hits its life time based
+	// on the Timeout configuration field.
+	TimeoutMessage string `ini:"timeout_message" json:"timeoutMessage" yaml:"TimeoutMessage" toml:"TimeoutMessage"`
 	// Tunneling can be optionally set to enable ngrok http(s) tunneling for this Iris app instance.
 	// See the `WithTunneling` Configurator too.
 	Tunneling TunnelingConfiguration `ini:"tunneling" json:"tunneling,omitempty" yaml:"Tunneling" toml:"Tunneling"`
@@ -914,6 +932,16 @@ func (c Configuration) GetKeepAlive() time.Duration {
 	return c.KeepAlive
 }
 
+// GetKeepAlive returns the Timeout field.
+func (c Configuration) GetTimeout() time.Duration {
+	return c.Timeout
+}
+
+// GetKeepAlive returns the TimeoutMessage field.
+func (c Configuration) GetTimeoutMessage() string {
+	return c.TimeoutMessage
+}
+
 // GetDisablePathCorrection returns the DisablePathCorrection field.
 func (c Configuration) GetDisablePathCorrection() bool {
 	return c.DisablePathCorrection
@@ -1088,6 +1116,14 @@ func WithConfiguration(c Configuration) Configurator {
 			main.KeepAlive = v
 		}
 
+		if v := c.Timeout; v > 0 {
+			main.Timeout = v
+		}
+
+		if v := c.TimeoutMessage; v != "" {
+			main.TimeoutMessage = v
+		}
+
 		if len(c.Tunneling.Tunnels) > 0 {
 			main.Tunneling = c.Tunneling
 		}
@@ -1234,12 +1270,18 @@ func WithConfiguration(c Configuration) Configurator {
 	}
 }
 
+// DefaultTimeoutMessage is the default timeout message which is rendered
+// on expired handlers when timeout handler is registered (see Timeout configuration field).
+var DefaultTimeoutMessage = `<html><head><title>Timeout</title></head><body><h1>Timeout</h1>Looks like the server is taking too long to respond, this can be caused by either poor connectivity or an error with our servers. Please try again in a while.</body></html>`
+
 // DefaultConfiguration returns the default configuration for an iris station, fills the main Configuration
 func DefaultConfiguration() Configuration {
 	return Configuration{
 		LogLevel:                          "info",
 		SocketSharding:                    false,
 		KeepAlive:                         0,
+		Timeout:                           0,
+		TimeoutMessage:                    DefaultTimeoutMessage,
 		DisableStartupLog:                 false,
 		DisableInterruptHandler:           false,
 		DisablePathCorrection:             false,

context/application.go

@@ -113,8 +113,9 @@ var (
 	// It's slice instead of map because if IRIS_APP_NAME env var exists,
 	// by-default all applications running on the same machine
 	// will have the same name unless `Application.SetName` is called.
-	registeredApps []Application
-	mu             sync.RWMutex
+	registeredApps                   []Application
+	onApplicationRegisteredListeners []func(Application)
+	mu                               sync.RWMutex
 )
 
 // RegisterApplication registers an application to the global shared storage.
@@ -126,6 +127,20 @@ func RegisterApplication(app Application) {
 	mu.Lock()
 	registeredApps = append(registeredApps, app)
 	mu.Unlock()
+
+	mu.RLock()
+	for _, listener := range onApplicationRegisteredListeners {
+		listener(app)
+	}
+	mu.RUnlock()
+}
+
+// OnApplicationRegistered adds a function which fires when a new application
+// is registered.
+func OnApplicationRegistered(listeners ...func(app Application)) {
+	mu.Lock()
+	onApplicationRegisteredListeners = append(onApplicationRegisteredListeners, listeners...)
+	mu.Unlock()
 }
 
 // GetApplications returns a slice of all the registered Applications.

context/configuration.go

@@ -20,6 +20,10 @@ type ConfigurationReadOnly interface {
 	GetSocketSharding() bool
 	// GetKeepAlive returns the KeepAlive field.
 	GetKeepAlive() time.Duration
+	// GetKeepAlive returns the Timeout field.
+	GetTimeout() time.Duration
+	// GetKeepAlive returns the TimeoutMessage field.
+	GetTimeoutMessage() string
 	// GetDisablePathCorrection returns the DisablePathCorrection field
 	GetDisablePathCorrection() bool
 	// GetDisablePathCorrectionRedirection returns the DisablePathCorrectionRedirection field.

context/context.go

@@ -708,7 +708,6 @@ func (ctx *Context) StopExecution() {
 		// And stop.
 		ctx.currentHandlerIndex = stopExecutionIndex
 	}
-
 }
 
 // IsStopped reports whether the current position of the context's handlers is -1,
@@ -2697,7 +2696,6 @@ func (ctx *Context) ReadMsgPack(ptr interface{}) error {
 // As a special case if the "ptr" was a pointer to string or []byte
 // then it will bind it to the request body as it is.
 func (ctx *Context) ReadBody(ptr interface{}) error {
-
 	// If the ptr is string or byte, read the body as it's.
 	switch v := ptr.(type) {
 	case *string:
@@ -4871,7 +4869,6 @@ func CookieAllowReclaim(cookieNames ...string) CookieOption {
 			header.Del("Cookie")
 		}
 	}
-
 }
 
 // CookieAllowSubdomains set to the Cookie Options
@@ -5888,5 +5885,12 @@ func (ctx *Context) GetID() interface{} {
 // It returns the Context's ID given by a `SetID`call,
 // followed by the client's IP and the method:uri.
 func (ctx *Context) String() string {
-	return fmt.Sprintf("[%s] %s ▶ %s:%s", ctx.GetID(), ctx.RemoteAddr(), ctx.Method(), ctx.Request().RequestURI)
+	id := ctx.GetID()
+	if id != nil {
+		if stringer, ok := id.(fmt.Stringer); ok {
+			id = stringer.String()
+		}
+	}
+
+	return fmt.Sprintf("[%v] %s ▶ %s:%s", id, ctx.RemoteAddr(), ctx.Method(), ctx.Request().RequestURI)
 }

core/router/router.go

@@ -6,6 +6,7 @@ import (
 	"sort"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/kataras/iris/v12/context"
 
@@ -271,6 +272,25 @@ func (router *Router) Downgraded() bool {
 	return router.mainHandler != nil && router.requestHandler == nil
 }
 
+// SetTimeoutHandler overrides the main handler with a timeout handler.
+//
+// TimeoutHandler supports the Pusher interface but does not support
+// the Hijacker or Flusher interfaces.
+//
+// All previous registered wrappers and middlewares are still executed as expected.
+func (router *Router) SetTimeoutHandler(timeout time.Duration, msg string) {
+	if timeout <= 0 {
+		return
+	}
+
+	mainHandler := router.mainHandler
+	h := func(w http.ResponseWriter, r *http.Request) {
+		mainHandler(w, r)
+	}
+
+	router.mainHandler = http.TimeoutHandler(http.HandlerFunc(h), timeout, msg).ServeHTTP
+}
+
 // WrapRouter adds a wrapper on the top of the main router.
 // Usually it's useful for third-party middleware
 // when need to wrap the entire application with a middleware like CORS.

iris.go

@@ -640,6 +640,11 @@ func (app *Application) Build() error {
 			return err
 		}
 		app.HTTPErrorHandler = routerHandler
+
+		if app.config.Timeout > 0 {
+			app.Router.SetTimeoutHandler(app.config.Timeout, app.config.TimeoutMessage)
+		}
+
 		// re-build of the router from outside can be done with
 		// app.RefreshRouter()
 	}

middleware/pprof/pprof.go

@@ -12,6 +12,17 @@ import (
 
 func init() {
 	context.SetHandlerName("iris/middleware/pprof.*", "iris.profiling")
+
+	/* for our readers:
+	apps.OnApplicationRegistered(func(app *iris.Application) {
+		app.Any("/debug/pprof/cmdline", iris.FromStd(pprof.Cmdline))
+		app.Any("/debug/pprof/profile", iris.FromStd(pprof.Profile))
+		app.Any("/debug/pprof/symbol", iris.FromStd(pprof.Symbol))
+		app.Any("/debug/pprof/trace", iris.FromStd(pprof.Trace))
+
+		app.Any("/debug/pprof /debug/pprof/{action:string}", New())
+	})
+	*/
 }
 
 // net/http/pprof copy: