Major logging refactor

v2/internal/app/debug.go

@@ -5,6 +5,5 @@ package app
 // Init initialises the application for a debug environment
 func (a *App) Init() error {
 	a.debug = true
-	println("Initialising debug options")
 	return nil
 }

v2/internal/app/desktop.go

@@ -3,8 +3,6 @@
 package app
 
 import (
-	"os"
-
 	"github.com/wailsapp/wails/v2/internal/binding"
 	"github.com/wailsapp/wails/v2/internal/ffenestri"
 	"github.com/wailsapp/wails/v2/internal/logger"
@@ -44,7 +42,7 @@ func CreateApp(options *options.App) *App {
 	options.MergeDefaults()
 
 	// Set up logger
-	myLogger := logger.New(os.Stdout)
+	myLogger := logger.New(options.Logger)
 	myLogger.SetLogLevel(logger.TRACE)
 
 	window := ffenestri.NewApplicationWithConfig(options, myLogger)

v2/internal/logger/custom_logger.go

@@ -2,7 +2,6 @@ package logger
 
 import (
 	"fmt"
-	"os"
 )
 
 // CustomLogger defines what a user can do with a logger
@@ -62,37 +61,36 @@ func (l *customLogger) Write(message string) error {
 // Trace level logging. Works like Sprintf.
 func (l *customLogger) Trace(format string, args ...interface{}) error {
 	format = fmt.Sprintf("%s | %s", l.name, format)
-	return l.logger.processLogMessage(TRACE, format, args...)
+	return l.logger.Trace(format, args...)
 }
 
 // Debug level logging. Works like Sprintf.
 func (l *customLogger) Debug(format string, args ...interface{}) error {
 	format = fmt.Sprintf("%s | %s", l.name, format)
-	return l.logger.processLogMessage(DEBUG, format, args...)
+	return l.logger.Debug(format, args...)
 }
 
 // Info level logging. Works like Sprintf.
 func (l *customLogger) Info(format string, args ...interface{}) error {
 	format = fmt.Sprintf("%s | %s", l.name, format)
-	return l.logger.processLogMessage(INFO, format, args...)
+	return l.logger.Info(format, args...)
 }
 
 // Warning level logging. Works like Sprintf.
 func (l *customLogger) Warning(format string, args ...interface{}) error {
 	format = fmt.Sprintf("%s | %s", l.name, format)
-	return l.logger.processLogMessage(WARNING, format, args...)
+	return l.logger.Warning(format, args...)
 }
 
 // Error level logging. Works like Sprintf.
 func (l *customLogger) Error(format string, args ...interface{}) error {
 	format = fmt.Sprintf("%s | %s", l.name, format)
-	return l.logger.processLogMessage(ERROR, format, args...)
+	return l.logger.Error(format, args...)
 
 }
 
 // Fatal level logging. Works like Sprintf.
 func (l *customLogger) Fatal(format string, args ...interface{}) {
 	format = fmt.Sprintf("%s | %s", l.name, format)
-	l.logger.processLogMessage(FATAL, format, args...)
+	l.logger.Fatal(format, args...)
-	os.Exit(1)
 }

v2/internal/logger/default_logger.go

@@ -1,38 +1,28 @@
 package logger
 
 import (
-	"fmt"
-	"io"
 	"os"
-	"sync"
+	"github.com/wailsapp/wails/v2/pkg/logger"
 )
 
 // Logger is a utlility to log messages to a number of destinations
 type Logger struct {
-	writers        []io.Writer
+	output logger.Logger
 	logLevel       uint8
 	showLevelInLog bool
-	lock           sync.RWMutex
 }
 
 // New creates a new Logger. You may pass in a number of `io.Writer`s that
 // are the targets for the logs
-func New(writers ...io.Writer) *Logger {
+func New(output logger.Logger) *Logger {
 	result := &Logger{
 		logLevel:       INFO,
 		showLevelInLog: true,
-	}
+		output: output,
-	for _, writer := range writers {
-		result.AddOutput(writer)
 	}
 	return result
 }
 
-// Writers gets the log writers
-func (l *Logger) Writers() []io.Writer {
-	return l.writers
-}
-
 // CustomLogger creates a new custom logger that prints out a name/id
 // before the messages
 func (l *Logger) CustomLogger(name string) CustomLogger {
@@ -49,95 +39,57 @@ func (l *Logger) SetLogLevel(level uint8) {
 	l.logLevel = level
 }
 
-// AddOutput adds the given `io.Writer` to the list of destinations
-// that get logged to
-func (l *Logger) AddOutput(writer io.Writer) {
-	l.writers = append(l.writers, writer)
-}
-
-func (l *Logger) write(loglevel uint8, message string) error {
-
-	// Don't print logs lower than the current log level
-	if loglevel < l.logLevel {
-		return nil
-	}
-
-	// Show log level text if enabled
-	if l.showLevelInLog {
-		message = mapLogLevel[loglevel] + message
-	}
-
-	// write out the logs
-	l.lock.Lock()
-	for _, writer := range l.writers {
-		_, err := writer.Write([]byte(message))
-		if err != nil {
-			l.lock.Unlock() // Because defer is slow
-			return err
-		}
-	}
-	l.lock.Unlock()
-	return nil
-}
-
-// writeln appends a newline character to the message before writing
-func (l *Logger) writeln(loglevel uint8, message string) error {
-	return l.write(loglevel, message+"\n")
-}
-
 // Writeln writes directly to the output with no log level
 // Appends a carriage return to the message
 func (l *Logger) Writeln(message string) error {
-	return l.write(BYPASS, message+"\n")
+	return l.output.Print(message+"\n")
 }
 
 // Write writes directly to the output with no log level
 func (l *Logger) Write(message string) error {
-	return l.write(BYPASS, message)
+	return l.output.Print(message)
-}
-
-// processLogMessage formats the given message before writing it out
-func (l *Logger) processLogMessage(loglevel uint8, format string, args ...interface{}) error {
-	message := fmt.Sprintf(format, args...)
-	return l.writeln(loglevel, message)
 }
 
 // Trace level logging. Works like Sprintf.
 func (l *Logger) Trace(format string, args ...interface{}) error {
-	return l.processLogMessage(TRACE, format, args...)
+	return l.output.Trace(format, args...)
 }
 
-// CustomTrace returns a custom Logging function that will insert the given name before the message
+// // CustomTrace returns a custom Logging function that will insert the given name before the message
-func (l *Logger) CustomTrace(name string) func(format string, args ...interface{}) {
+// func (l *Logger) CustomTrace(name string) func(format string, args ...interface{}) {
-	return func(format string, args ...interface{}) {
+// 	return func(format string, args ...interface{}) {
-		format = name + " | " + format
+// 		format = name + " | " + format
-		l.processLogMessage(TRACE, format, args...)
+// 		l.processLogMessage(format, args...)
-	}
+// 	}
-}
+// }
 
 // Debug level logging. Works like Sprintf.
 func (l *Logger) Debug(format string, args ...interface{}) error {
-	return l.processLogMessage(DEBUG, format, args...)
+	return l.output.Debug(format, args...)
 }
 
 // Info level logging. Works like Sprintf.
 func (l *Logger) Info(format string, args ...interface{}) error {
-	return l.processLogMessage(INFO, format, args...)
+	return l.output.Info(format, args...)
 }
 
 // Warning level logging. Works like Sprintf.
 func (l *Logger) Warning(format string, args ...interface{}) error {
-	return l.processLogMessage(WARNING, format, args...)
+	return l.output.Warning(format, args...)
 }
 
 // Error level logging. Works like Sprintf.
 func (l *Logger) Error(format string, args ...interface{}) error {
-	return l.processLogMessage(ERROR, format, args...)
+	return l.output.Error(format, args...)
 
 }
 
 // Fatal level logging. Works like Sprintf.
 func (l *Logger) Fatal(format string, args ...interface{}) {
-	l.processLogMessage(FATAL, format, args...)
+	err := l.output.Fatal(format, args...)
+	// Not much we can do but print it out before exiting
+	if err != nil {
+		println(err.Error())
+	}
 	os.Exit(1)
 }

v2/pkg/logger/default.go

@@ -0,0 +1,55 @@
+package logger
+
+import (
+	"fmt"
+	"os"
+)
+
+// DefaultLogger is a utlility to log messages to a number of destinations
+type DefaultLogger struct {}
+
+// NewDefaultLogger creates a new Logger.
+func NewDefaultLogger() Logger {
+	return &DefaultLogger{}
+}
+
+// Print works like Sprintf.
+func (l *DefaultLogger) Print(message string, args ...interface{}) error {
+	fmt.Printf(message + "\n", args...)
+	return nil
+}
+// Trace level logging. Works like Sprintf.
+func (l *DefaultLogger) Trace(message string, args ...interface{}) error {
+	fmt.Printf("TRACE | " + message + "\n", args...)
+	return nil
+}
+// Debug level logging. Works like Sprintf.
+func (l *DefaultLogger) Debug(message string, args ...interface{}) error {
+	fmt.Printf("DEBUG | " + message + "\n", args...)
+	return nil
+}
+
+// Info level logging. Works like Sprintf.
+func (l *DefaultLogger) Info(message string, args ...interface{}) error {
+	fmt.Printf("INFO  | " + message + "\n", args...)
+	return nil
+}
+
+// Warning level logging. Works like Sprintf.
+func (l *DefaultLogger) Warning(message string, args ...interface{}) error {
+	fmt.Printf("WARN  | " + message + "\n", args...)
+	return nil
+}
+
+// Error level logging. Works like Sprintf.
+func (l *DefaultLogger) Error(message string, args ...interface{}) error {
+	fmt.Printf("ERROR | " + message + "\n", args...)
+	return nil
+}
+
+// Fatal level logging. Works like Sprintf.
+func (l *DefaultLogger) Fatal(message string, args ...interface{}) error {
+	fmt.Printf("FATAL | " + message + "\n", args...)
+	os.Exit(1)
+	return nil
+}

v2/pkg/logger/logger.go

@@ -0,0 +1,11 @@
+package logger
+
+type Logger interface {
+	Print(message string, args ...interface{}) error
+	Trace(message string, args ...interface{}) error
+	Debug(message string, args ...interface{}) error
+	Info(message string, args ...interface{}) error
+	Warning(message string, args ...interface{}) error
+	Error(message string, args ...interface{}) error
+	Fatal(message string, args ...interface{}) error
+}

v2/pkg/options/default.go

@@ -1,7 +1,9 @@
 package options
 
-import "github.com/wailsapp/wails/v2/pkg/options/mac"
+import ( 
-
+	"github.com/wailsapp/wails/v2/pkg/options/mac"
+	"github.com/wailsapp/wails/v2/pkg/logger"
+)
 // Default options for creating the App
 var Default = &App{
 	Title:    "My Wails App",
@@ -15,4 +17,5 @@ var Default = &App{
 		WebviewIsTransparent:          false,
 		WindowBackgroundIsTranslucent: false,
 	},
+	Logger: logger.NewDefaultLogger(),
 }

v2/pkg/options/options.go

@@ -4,6 +4,7 @@ import (
 	"log"
 
 	"github.com/imdario/mergo"
+	"github.com/wailsapp/wails/v2/pkg/logger"
 	"github.com/wailsapp/wails/v2/pkg/options/mac"
 )
 
@@ -22,6 +23,7 @@ type App struct {
 	DevTools      bool
 	RGBA          int
 	Mac           *mac.Options
+	Logger logger.Logger
 }
 
 // MergeDefaults will set the minimum default values for an application