feat: new priority key settings for key value formatter

README.md

@@ -43,7 +43,6 @@ var myLog := log.NewLogger(
 	[]*Output{output1, output2}
 )
 myLog.Info("My First Info Message")
-
 ```
 
 ## Custom Formatter / Printer

cmd/keyValueFormatter/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"time"
+
+	"git.martin-riedl.de/golang/log"
+)
+
+func main() {
+	advancedSettings()
+}
+
+func advancedSettings() {
+	// Key Value Formatter with special settings
+	formatter := log.NewFormatterKeyValue()
+	formatter.HighPriorityKeys = []string{"firstField"}
+	formatter.PriorityKeys = []string{"secondField"}
+	formatter.TimeFormat = time.RFC3339Nano
+
+	// create new log instance
+	output := log.NewOutput(log.LevelDebug, formatter, log.NewPrinterStdout())
+	logger := log.NewLogger([]*log.Output{output})
+
+	// log some message
+	logger.WithMap(log.Map{
+		"someField":   "Martin",
+		"firstField":  "John",
+		"secondField": "Doe",
+	}).Info("This is an info message")
+}

cmd/simple/main.go

@@ -17,7 +17,7 @@ func someMethod() {
 }
 
 func anotherMethod() {
-	log.Default.WithMap(map[string]any{
+	log.Default.WithMap(log.Map{
 		"foo": "bar",
 		"bar": "baz",
 	}).Info("Second Hello World")

entry.go

@@ -34,6 +34,8 @@ type Content struct {
 	Value any    `json:"value"`
 }
 
+type Map map[string]any
+
 func NewEntry(logger *Logger) *Entry {
 	return &Entry{
 		Logger:  logger,
@@ -49,7 +51,7 @@ func (entry *Entry) With(key string, value any) *Entry {
 	return entry
 }
 
-func (entry *Entry) WithMap(entries map[string]any) *Entry {
+func (entry *Entry) WithMap(entries Map) *Entry {
 	for key, value := range entries {
 		entry.With(key, value)
 	}

formatter_json.go

@@ -24,7 +24,7 @@ import (
 type FormatterJSON struct {
 	FlatContent bool
 	TimeFormat  string
-	data        map[string]interface{}
+	data        map[string]any
 }
 
 func NewFormatterJSON() *FormatterJSON {
@@ -35,7 +35,7 @@ func NewFormatterJSON() *FormatterJSON {
 
 func (formatter *FormatterJSON) Begin(entry *Entry) {
 	// reset formatter
-	formatter.data = make(map[string]interface{})
+	formatter.data = make(map[string]any)
 
 	// add timestamp
 	formatter.data["time"] = entry.Time.Format(formatter.TimeFormat)

formatter_keyvalue.go

@@ -16,12 +16,17 @@ package log
 
 import (
 	"fmt"
+	"slices"
 	"strings"
 	"time"
 )
 
 type FormatterKeyValue struct {
 	TimeFormat string
+	// HighPriorityKeys are printed before the actual log message
+	HighPriorityKeys []string
+	// PriorityKeys are printed after the log message
+	PriorityKeys     []string
 	builder          strings.Builder
 	isFirstKVWritten bool
 }
@@ -45,9 +50,23 @@ func (formatter *FormatterKeyValue) Begin(entry *Entry) {
 }
 
 func (formatter *FormatterKeyValue) Process(entry *Entry) {
+	// log high priority keys
+	for _, content := range entry.Content {
+		if slices.Contains(formatter.HighPriorityKeys, content.Key) {
+			formatter.addKV(content.Key, content.Value)
+		}
+	}
+
 	// add message
 	formatter.addKV("message", entry.Message)
 
+	// log priority keys
+	for _, content := range entry.Content {
+		if slices.Contains(formatter.PriorityKeys, content.Key) {
+			formatter.addKV(content.Key, content.Value)
+		}
+	}
+
 	// add call stack
 	if len(entry.CallStack) > 0 {
 		caller := entry.CallStack[0]
@@ -57,8 +76,11 @@ func (formatter *FormatterKeyValue) Process(entry *Entry) {
 
 	// add additional fields
 	for _, content := range entry.Content {
+		if !slices.Contains(formatter.HighPriorityKeys, content.Key) &&
+			!slices.Contains(formatter.PriorityKeys, content.Key) {
 			formatter.addKV(content.Key, content.Value)
 		}
+	}
 }
 
 func (formatter *FormatterKeyValue) addKV(key string, value any) {

logger.go

@@ -113,7 +113,7 @@ func (logger *Logger) With(key string, value any) *Entry {
 	return entry
 }
 
-func (logger *Logger) WithMap(entries map[string]any) *Entry {
+func (logger *Logger) WithMap(entries Map) *Entry {
 	entry := NewEntry(logger)
 	entry.WithMap(entries)
 	return entry