Support logging

v3/V3 Changes.md

@@ -32,6 +32,10 @@ Similarly, the `Emit` function has changed. Instead of taking a name and optiona
 
 In v2, `Off` and `OffAll` calls would remove events in both JS and Go. Due to the multi-window nature of v3, this has been changed so that these methods only apply to the context they are called in. For example, if you call `Off` in a window, it will only remove events for that window. If you use `Off` in Go, it will only remove events for Go.
 
+### Logging
+
+There was a lot of requests for different types of logging in v2 so for v3 we have simplified things to make it as customisable as you want. There is now a single call `Log` that takes a LogMessage object. This object contains the message, the level, and the source, the log message and any data to be printed out. The default logger is the Console logger, however any number of outputs to log to can be added. Simply add custom loggers to the `options.Application.Logger.CustomLoggers` slice. The default logger does not have log level filtering, however custom loggers can be added that do.
+
 ### Developer notes
 
 When emitting an event in Go, it will dispatch the event to local Go listeners and also each window in the application.
@@ -39,11 +43,11 @@ When emitting an event in JS, it now sends the event to the application. This wi
 
 ## Window
 
-TBD
+The Window API has largely remained the same, however there are a few changes to note. 
 
 ## ClipBoard
 
-TBD
+The clipboard API has been simplified. There is now a single `Clipboard` object that can be used to read and write to the clipboard. The `Clipboard` object is available in both Go and JS. `SetText()` to set the text and `Text()` to get the text.
 
 ## Bindings
 
@@ -51,3 +55,5 @@ TBD
 
 ## Dialogs
 
+Dialogs are now available in JavaScript! 
+

v3/internal/commands/bindings.go

@@ -37,6 +37,6 @@ func GenerateBindings(options *GenerateBindingsOptions) error {
 	if err != nil {
 		return fmt.Errorf("error writing models file: %v", err)
 	}
-
+	println("Generated models file '" + options.ModelsFilename + "'")
 	return nil
 }

v3/internal/runtime/desktop/events.js

@@ -183,5 +183,5 @@ export function OffAll() {
    Emit emits an event to all listeners
  */
 export function Emit(event) {
-    call("Emit", event);
+    return call("Emit", event);
 }

v3/internal/runtime/desktop/log.js

@@ -0,0 +1,23 @@
+/*
+ _	   __	  _ __
+| |	 / /___ _(_) /____
+| | /| / / __ `/ / / ___/
+| |/ |/ / /_/ / / (__  )
+|__/|__/\__,_/_/_/____/
+The electron alternative for Go
+(c) Lea Anthony 2019-present
+*/
+
+/* jshint esversion: 9 */
+
+import {newRuntimeCaller} from "./runtime";
+
+let call = newRuntimeCaller("log");
+
+/**
+ * Logs a message.
+ * @param {message} Message to log
+ */
+export function Log(message) {
+    return call("Log", message);
+}

v3/internal/runtime/desktop/main.js

@@ -13,6 +13,7 @@ import {dialogCallback, dialogErrorCallback, Error, Info, OpenFile, Question, Sa
 
 import * as Clipboard from './clipboard';
 import * as Application from './application';
+import * as Log from './log';
 
 import {newWindow} from "./window";
 import {dispatchCustomEvent, Emit, Off, OffAll, On, Once, OnMultiple} from "./events";
@@ -37,6 +38,7 @@ export function newRuntime(id) {
         Application: {
             ...Application
         },
+        Log,
         Dialog: {
             Info,
             Warning,

v3/internal/runtime/desktop/runtime.js

@@ -15,7 +15,9 @@ const runtimeURL = window.location.origin + "/wails/runtime";
 function runtimeCall(method, args) {
     let url = new URL(runtimeURL);
     url.searchParams.append("method", method);
+    if(args) {
         url.searchParams.append("args", JSON.stringify(args));
+    }
     return new Promise((resolve, reject) => {
         fetch(url)
             .then(response => {
@@ -37,7 +39,6 @@ function runtimeCall(method, args) {
 export function newRuntimeCaller(object, id) {
     if (!id || id === -1) {
         return function (method, args) {
-            args = args || {};
             return runtimeCall(object + "." + method, args);
         };
     }

v3/internal/runtime/runtime_production_desktop_darwin.js

@@ -1 +1 @@
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v3/internal/runtime/runtime_production_desktop_linux.js

@@ -1 +1 @@
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v3/internal/runtime/runtime_production_desktop_windows.js

@@ -1 +1 @@
-(()=>{var W=Object.defineProperty;var x=(t,e)=>{for(var n in e)W(t,n,{get:e[n],enumerable:!0})};var y=window.location.origin+"/wails/runtime";function h(t,e){let n=new URL(y);return n.searchParams.append("method",t),n.searchParams.append("args",JSON.stringify(e)),new Promise((i,r)=>{fetch(n).then(o=>{if(o.ok)return o.headers.get("content-type")&&o.headers.get("content-type").indexOf("application/json")!==-1?o.json():o.text();r(Error(o.statusText))}).then(o=>i(o)).catch(o=>r(o))})}function l(t,e){return!e||e===-1?function(n,i){return i=i||{},h(t+"."+n,i)}:function(n,i){return i=i||{},i.windowID=e,h(t+"."+n,i)}}var D="useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict";var w=(t=21)=>{let e="",n=t;for(;n--;)e+=D[Math.random()*64|0];return e};var I=l("dialog"),u=new Map;function Q(){let t;do t=w();while(u.has(t));return t}function S(t,e,n){let i=u.get(t);i&&(n?i.resolve(JSON.parse(e)):i.resolve(e),u.delete(t))}function g(t,e){let n=u.get(t);n&&(n.reject(e),u.delete(t))}function c(t,e){return new Promise((n,i)=>{let r=Q();e=e||{},e["dialog-id"]=r,u.set(r,{resolve:n,reject:i}),I(t,e).catch(o=>{i(o),u.delete(r)})})}function C(t){return c("Info",t)}function M(t){return c("Warning",t)}function O(t){return c("Error",t)}function b(t){return c("Question",t)}function v(t){return c("OpenFile",t)}function E(t){return c("SaveFile",t)}var f={};x(f,{SetText:()=>H,Text:()=>B});var T=l("clipboard");function H(t){return T("SetText",{text:t})}function B(){return T("Text")}var p={};x(p,{Hide:()=>L,Quit:()=>J,Show:()=>N});var m=l("application");function L(){return m("Hide")}function N(){return m("Show")}function J(){return m("Quit")}function k(t){let e=l("window",t);return{Center:()=>e("Center"),SetTitle:n=>e("SetTitle",{title:n}),Fullscreen:()=>e("Fullscreen"),UnFullscreen:()=>e("UnFullscreen"),SetSize:(n,i)=>e("SetSize",{width:n,height:i}),Size:()=>e("Size"),SetMaxSize:(n,i)=>e("SetMaxSize",{width:n,height:i}),SetMinSize:(n,i)=>e("SetMinSize",{width:n,height:i}),SetAlwaysOnTop:n=>e("SetAlwaysOnTop",{alwaysOnTop:n}),SetPosition:(n,i)=>e("SetPosition",{x:n,y:i}),Position:()=>e("Position"),Screen:()=>e("Screen"),Hide:()=>e("Hide"),Maximise:()=>e("Maximise"),Show:()=>e("Show"),ToggleMaximise:()=>e("ToggleMaximise"),UnMaximise:()=>e("UnMaximise"),Minimise:()=>e("Minimise"),UnMinimise:()=>e("UnMinimise"),SetBackgroundColour:(n,i,r,o)=>e("SetBackgroundColour",{r:n,g:i,b:r,a:o})}}var G=l("events"),d=class{constructor(e,n,i){this.eventName=e,this.maxCallbacks=i||-1,this.Callback=r=>(n(r),this.maxCallbacks===-1?!1:(this.maxCallbacks-=1,this.maxCallbacks===0))}};var a=new Map;function s(t,e,n){let i=a.get(t)||[],r=new d(t,e,n);return i.push(r),a.set(t,i),()=>_(r)}function R(t,e){return s(t,e,-1)}function F(t,e){return s(t,e,1)}function _(t){let e=t.eventName,n=a.get(e).filter(i=>i!==t);n.length===0?a.delete(e):a.set(e,n)}function U(t){console.log("dispatching event: ",{event:t});let e=a.get(t.name);if(e){let n=[];e.forEach(i=>{i.Callback(t)&&n.push(i)}),n.length>0&&(e=e.filter(i=>!n.includes(i)),e.length===0?a.delete(t.name):a.set(t.name,e))}}function z(t,...e){[t,...e].forEach(i=>{a.delete(i)})}function A(){a.clear()}function P(t){G("Emit",t)}window.wails={...j(-1)};window._wails={dialogCallback:S,dialogErrorCallback:g,dispatchCustomEvent:U};function j(t){return{Clipboard:{...f},Application:{...p},Dialog:{Info:C,Warning:M,Error:O,Question:b,OpenFile:v,SaveFile:E},Events:{Emit:P,On:R,Once:F,OnMultiple:s,Off:z,OffAll:A},Window:k(t)}}console.log("Wails v3.0.0 Debug Mode Enabled");})();
+(()=>{var y=Object.defineProperty;var f=(t,e)=>{for(var n in e)y(t,n,{get:e[n],enumerable:!0})};var L=window.location.origin+"/wails/runtime";function h(t,e){let n=new URL(L);return n.searchParams.append("method",t),e&&n.searchParams.append("args",JSON.stringify(e)),new Promise((i,r)=>{fetch(n).then(o=>{if(o.ok)return o.headers.get("content-type")&&o.headers.get("content-type").indexOf("application/json")!==-1?o.json():o.text();r(Error(o.statusText))}).then(o=>i(o)).catch(o=>r(o))})}function l(t,e){return!e||e===-1?function(n,i){return h(t+"."+n,i)}:function(n,i){return i=i||{},i.windowID=e,h(t+"."+n,i)}}var D="useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict";var g=(t=21)=>{let e="",n=t;for(;n--;)e+=D[Math.random()*64|0];return e};var I=l("dialog"),u=new Map;function Q(){let t;do t=g();while(u.has(t));return t}function S(t,e,n){let i=u.get(t);i&&(n?i.resolve(JSON.parse(e)):i.resolve(e),u.delete(t))}function C(t,e){let n=u.get(t);n&&(n.reject(e),u.delete(t))}function c(t,e){return new Promise((n,i)=>{let r=Q();e=e||{},e["dialog-id"]=r,u.set(r,{resolve:n,reject:i}),I(t,e).catch(o=>{i(o),u.delete(r)})})}function M(t){return c("Info",t)}function O(t){return c("Warning",t)}function b(t){return c("Error",t)}function v(t){return c("Question",t)}function E(t){return c("OpenFile",t)}function R(t){return c("SaveFile",t)}var m={};f(m,{SetText:()=>H,Text:()=>B});var T=l("clipboard");function H(t){return T("SetText",{text:t})}function B(){return T("Text")}var d={};f(d,{Hide:()=>N,Quit:()=>G,Show:()=>J});var p=l("application");function N(){return p("Hide")}function J(){return p("Show")}function G(){return p("Quit")}var x={};f(x,{Log:()=>j});var _=l("log");function j(t){return _("Log",t)}function k(t){let e=l("window",t);return{Center:()=>e("Center"),SetTitle:n=>e("SetTitle",{title:n}),Fullscreen:()=>e("Fullscreen"),UnFullscreen:()=>e("UnFullscreen"),SetSize:(n,i)=>e("SetSize",{width:n,height:i}),Size:()=>e("Size"),SetMaxSize:(n,i)=>e("SetMaxSize",{width:n,height:i}),SetMinSize:(n,i)=>e("SetMinSize",{width:n,height:i}),SetAlwaysOnTop:n=>e("SetAlwaysOnTop",{alwaysOnTop:n}),SetPosition:(n,i)=>e("SetPosition",{x:n,y:i}),Position:()=>e("Position"),Screen:()=>e("Screen"),Hide:()=>e("Hide"),Maximise:()=>e("Maximise"),Show:()=>e("Show"),ToggleMaximise:()=>e("ToggleMaximise"),UnMaximise:()=>e("UnMaximise"),Minimise:()=>e("Minimise"),UnMinimise:()=>e("UnMinimise"),SetBackgroundColour:(n,i,r,o)=>e("SetBackgroundColour",{r:n,g:i,b:r,a:o})}}var q=l("events"),w=class{constructor(e,n,i){this.eventName=e,this.maxCallbacks=i||-1,this.Callback=r=>(n(r),this.maxCallbacks===-1?!1:(this.maxCallbacks-=1,this.maxCallbacks===0))}};var a=new Map;function s(t,e,n){let i=a.get(t)||[],r=new w(t,e,n);return i.push(r),a.set(t,i),()=>K(r)}function F(t,e){return s(t,e,-1)}function U(t,e){return s(t,e,1)}function K(t){let e=t.eventName,n=a.get(e).filter(i=>i!==t);n.length===0?a.delete(e):a.set(e,n)}function z(t){console.log("dispatching event: ",{event:t});let e=a.get(t.name);if(e){let n=[];e.forEach(i=>{i.Callback(t)&&n.push(i)}),n.length>0&&(e=e.filter(i=>!n.includes(i)),e.length===0?a.delete(t.name):a.set(t.name,e))}}function A(t,...e){[t,...e].forEach(i=>{a.delete(i)})}function P(){a.clear()}function W(t){return q("Emit",t)}window.wails={...V(-1)};window._wails={dialogCallback:S,dialogErrorCallback:C,dispatchCustomEvent:z};function V(t){return{Clipboard:{...m},Application:{...d},Log:x,Dialog:{Info:M,Warning:O,Error:b,Question:v,OpenFile:E,SaveFile:R},Events:{Emit:W,On:F,Once:U,OnMultiple:s,Off:A,OffAll:P},Window:k(t)}}console.log("Wails v3.0.0 Debug Mode Enabled");})();

v3/pkg/application/application.go

@@ -3,9 +3,12 @@ package application
 import "C"
 import (
 	"log"
+	"os"
 	"runtime"
 	"sync"
 
+	"github.com/wailsapp/wails/v3/pkg/logger"
+
 	"github.com/wailsapp/wails/v3/pkg/events"
 	"github.com/wailsapp/wails/v3/pkg/options"
 
@@ -29,7 +32,13 @@ func New(appOptions options.Application) *App {
 		options:                   appOptions,
 		applicationEventListeners: make(map[uint][]func()),
 		systemTrays:               make(map[uint]*SystemTray),
+		log:                       logger.New(appOptions.Logger.CustomLoggers...),
 	}
+
+	if !appOptions.Logger.Silent {
+		result.log.AddOutput(&logger.Console{})
+	}
+
 	result.Events = NewCustomEventProcessor(result.dispatchEventToWindows)
 	globalApplication = result
 	return result
@@ -77,13 +86,6 @@ type webViewAssetRequest struct {
 
 var webviewRequests = make(chan *webViewAssetRequest)
 
-type EventHandler interface {
-	On(eventName string, args any)
-	OnMultiple(eventName string, args any, count int)
-	Once(eventName string, args any)
-	Emit(eventName string, args any)
-}
-
 type App struct {
 	options                       options.Application
 	applicationEventListeners     map[uint][]func()
@@ -114,10 +116,9 @@ type App struct {
 	// The main application menu
 	ApplicationMenu *Menu
 
-	// About MessageDialog
 	clipboard *Clipboard
-
 	Events    *EventProcessor
+	log       *logger.Logger
 }
 
 func (a *App) getSystemTrayID() uint {
@@ -146,6 +147,40 @@ func (a *App) NewWebviewWindow() *WebviewWindow {
 	return a.NewWebviewWindowWithOptions(nil)
 }
 
+func (a *App) info(message string, args ...any) {
+	a.Log(&logger.Message{
+		Level:   "INFO",
+		Message: message,
+		Data:    args,
+		Sender:  "Wails",
+	})
+}
+
+func (a *App) fatal(message string, args ...any) {
+	msg := "************** FATAL **************\n"
+	msg += message
+	msg += "***********************************\n"
+
+	a.Log(&logger.Message{
+		Level:   "FATAL",
+		Message: msg,
+		Data:    args,
+		Sender:  "Wails",
+	})
+
+	a.log.Flush()
+	os.Exit(1)
+}
+
+func (a *App) error(message string, args ...any) {
+	a.Log(&logger.Message{
+		Level:   "ERROR",
+		Message: message,
+		Data:    args,
+		Sender:  "Wails",
+	})
+}
+
 func (a *App) NewWebviewWindowWithOptions(windowOptions *options.WebviewWindow) *WebviewWindow {
 	// Ensure we have sane defaults
 	if windowOptions == nil {
@@ -177,7 +212,6 @@ func (a *App) NewWebviewWindowWithOptions(windowOptions *options.WebviewWindow)
 }
 
 func (a *App) NewSystemTray() *SystemTray {
-
 	id := a.getSystemTrayID()
 	newSystemTray := NewSystemTray(id)
 	a.systemTraysLock.Lock()
@@ -191,6 +225,7 @@ func (a *App) NewSystemTray() *SystemTray {
 }
 
 func (a *App) Run() error {
+	a.info("Starting application")
 	a.impl = newPlatformApp(a)
 
 	a.running = true
@@ -431,3 +466,7 @@ func (a *App) Show() {
 		a.impl.show()
 	}
 }
+
+func (a *App) Log(message *logger.Message) {
+	a.log.Log(message)
+}

v3/pkg/application/messageprocessor.go

@@ -65,6 +65,8 @@ func (m *MessageProcessor) HandleRuntimeCall(rw http.ResponseWriter, r *http.Req
 		m.processEventsMethod(method, rw, r, targetWindow, params)
 	case "application":
 		m.processApplicationMethod(method, rw, r, targetWindow, params)
+	case "log":
+		m.processLogMethod(method, rw, r, targetWindow, params)
 	default:
 		m.httpError(rw, "Unknown runtime call: %s", object)
 	}

v3/pkg/application/messageprocessor_clipboard.go

@@ -4,11 +4,11 @@ import (
 	"net/http"
 )
 
-func (m *MessageProcessor) processClipboardMethod(method string, rw http.ResponseWriter, r *http.Request, window *WebviewWindow, args QueryParams) {
+func (m *MessageProcessor) processClipboardMethod(method string, rw http.ResponseWriter, _ *http.Request, _ *WebviewWindow, params QueryParams) {
 
 	switch method {
 	case "SetText":
-		title := args.String("text")
+		title := params.String("text")
 		if title == nil {
 			m.Error("SetText: text is required")
 			return

v3/pkg/application/messageprocessor_log.go

@@ -0,0 +1,26 @@
+package application
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/wailsapp/wails/v3/pkg/logger"
+)
+
+func (m *MessageProcessor) processLogMethod(method string, rw http.ResponseWriter, _ *http.Request, window *WebviewWindow, params QueryParams) {
+	switch method {
+	case "Log":
+		var msg logger.Message
+		err := params.ToStruct(&msg)
+		if err != nil {
+			m.httpError(rw, "error parsing log message: %s", err.Error())
+			return
+		}
+		msg.Sender = fmt.Sprintf("%d", window.id)
+		globalApplication.Log(&msg)
+		m.ok(rw)
+	default:
+		m.httpError(rw, "Unknown log method: %s", method)
+	}
+
+}

v3/pkg/application/webview_window.go

@@ -3,6 +3,9 @@ package application
 import (
 	"fmt"
 	"sync"
+	"time"
+
+	"github.com/wailsapp/wails/v3/pkg/logger"
 
 	"github.com/wailsapp/wails/v2/pkg/assetserver"
 	"github.com/wailsapp/wails/v2/pkg/assetserver/webview"
@@ -98,11 +101,10 @@ func NewWindow(options *options.WebviewWindow) *WebviewWindow {
 	}
 
 	opts := assetserveroptions.Options{Assets: options.Assets.FS, Handler: options.Assets.Handler, Middleware: options.Assets.Middleware}
-	// TODO Bindings, Logger, ServingFrom disk?
+	// TODO Bindings, ServingFrom disk?
 	srv, err := assetserver.NewAssetServer("", opts, false, nil, runtime.RuntimeAssetsBundle)
 	if err != nil {
-		// TODO handle errors
+		globalApplication.fatal(err.Error())
-		panic(err)
 	}
 
 	result := &WebviewWindow{
@@ -365,7 +367,7 @@ func (w *WebviewWindow) SetBackgroundColour(colour *options.RGBA) *WebviewWindow
 }
 
 func (w *WebviewWindow) handleMessage(message string) {
-	fmt.Printf("[window %d] %s\n", w.id, message)
+	w.info(message)
 	// Check for special messages
 	if message == "test" {
 		w.SetTitle("Hello World")
@@ -376,7 +378,7 @@ func (w *WebviewWindow) handleMessage(message string) {
 
 func (w *WebviewWindow) handleWebViewRequest(request webview.Request) {
 	url, _ := request.URL()
-	fmt.Printf("[window %d] Request %s\n", w.id, url)
+	w.info("Request: %s", url)
 	w.assets.ServeWebViewRequest(request)
 }
 
@@ -621,3 +623,14 @@ func (w *WebviewWindow) dispatchCustomEvent(event *CustomEvent) {
 	msg := fmt.Sprintf("_wails.dispatchCustomEvent(%s);", event.ToJSON())
 	w.ExecJS(msg)
 }
+
+func (w *WebviewWindow) info(message string, args ...any) {
+
+	globalApplication.Log(&logger.Message{
+		Level:   "INFO",
+		Message: message,
+		Data:    args,
+		Sender:  fmt.Sprintf("window %d", w.id),
+		Time:    time.Now(),
+	})
+}

v3/pkg/logger/log.go

@@ -0,0 +1,35 @@
+package logger
+
+import (
+	"fmt"
+)
+
+type Logger struct {
+	output []Output
+}
+
+func New(outputs ...Output) *Logger {
+	result := &Logger{}
+	if outputs != nil {
+		result.output = outputs
+	}
+	return result
+}
+
+func (l *Logger) AddOutput(output Output) {
+	l.output = append(l.output, output)
+}
+
+func (l *Logger) Log(message *Message) {
+	for _, o := range l.output {
+		go o.Log(message)
+	}
+}
+
+func (l *Logger) Flush() {
+	for _, o := range l.output {
+		if err := o.Flush(); err != nil {
+			fmt.Printf("Error flushing '%s' Logger: %s\n", o.Name(), err.Error())
+		}
+	}
+}

v3/pkg/logger/log_console.go

@@ -0,0 +1,27 @@
+package logger
+
+import "fmt"
+
+type Console struct{}
+
+func (l *Console) Name() string {
+	return "Console"
+}
+
+func (l *Console) Log(message *Message) {
+	msg := fmt.Sprintf(message.Message+"\n", message.Data...)
+	level := ""
+	if message.Level != "" {
+		level = fmt.Sprintf("[%s] ", message.Level)
+	}
+	sender := ""
+	if message.Sender != "" {
+		sender = fmt.Sprintf("%s: ", message.Sender)
+	}
+
+	fmt.Printf("%s%s%s", level, sender, msg)
+}
+
+func (l *Console) Flush() error {
+	return nil
+}

v3/pkg/logger/message.go

@@ -0,0 +1,11 @@
+package logger
+
+import "time"
+
+type Message struct {
+	Level   string    `json:"log"`
+	Message string    `json:"message"`
+	Data    []any     `json:"data,omitempty"`
+	Sender  string    `json:"-"`
+	Time    time.Time `json:"-"`
+}

v3/pkg/logger/output.go

@@ -0,0 +1,7 @@
+package logger
+
+type Output interface {
+	Name() string
+	Log(message *Message)
+	Flush() error
+}

v3/pkg/options/application.go

@@ -1,9 +1,15 @@
 package options
 
+import "github.com/wailsapp/wails/v3/pkg/logger"
+
 type Application struct {
 	Name        string
 	Description string
 	Icon        []byte
 	Mac         Mac
 	Bind        []interface{}
+	Logger      struct {
+		Silent        bool
+		CustomLoggers []logger.Output
+	}
 }