1st ver

.gitignore

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+.idea

Readme.md

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+#xlog
+
+This package allows better log control through the application
+
+Once you set XLOG ENV VAR, either you name each log you want or set it to ALL,

go.mod

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+module go.digitalcircle.com.br/open/xlog
+
+go 1.17

lib.go

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+package xlog
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"sync"
+)
+
+var envLog string
+var nullLog *log.Logger
+var all bool
+var mx sync.Mutex
+var loggers map[string]*log.Logger
+
+func init() {
+	envLog = os.Getenv("XLOG")
+	loggers = make(map[string]*log.Logger)
+	logs := strings.Split(envLog, ",")
+	for _, v := range logs {
+		if v == "ALL" {
+			all = true
+		}
+		loggers[v] = log.New(log.Writer(), v, log.Flags())
+	}
+
+	nullLog = log.New(io.Discard, "", 0)
+}
+func Logger(n string) *log.Logger {
+	ret, ok := loggers[n]
+	if ok {
+		return ret
+	}
+	if all {
+		mx.Lock()
+		defer mx.Unlock()
+
+		if ok {
+			return ret
+		}
+		ret = log.New(log.Writer(), n+" - ", log.Flags())
+		loggers[n] = ret
+		return ret
+
+	} else {
+		mx.Lock()
+		defer mx.Unlock()
+		loggers[n] = nullLog
+	}
+
+	return nullLog
+}
+func Loggers() map[string]bool {
+	ret := make(map[string]bool)
+	for k, v := range loggers {
+		ret[k] = v != nullLog
+	}
+	return ret
+}
+func Enable(n string) *log.Logger {
+	ret, ok := loggers[n]
+	if ok {
+		return ret
+	}
+
+	ret = log.New(log.Writer(), n, log.Flags())
+	loggers[n] = ret
+	return ret
+
+}
+func Disable(n string) {
+	loggers[n] = nullLog
+}
+
+func Log() *log.Logger {
+	return &log.Logger{}
+}
+func Debug() *log.Logger {
+	return Logger("debug")
+}
+
+func Trace() *log.Logger {
+	return Logger("trace")
+}
+
+func Warn() *log.Logger {
+	return Logger("warm")
+}
+
+func Fatal() *log.Logger {
+	return Logger("fatal")
+}
+
+func Status() string {
+	sb := strings.Builder{}
+	sb.WriteString(fmt.Sprintf("XLOG STATUS:\n"))
+	sb.WriteString(fmt.Sprintf("  LOGGER - ENABLE\n"))
+	for k, v := range Loggers() {
+		sb.WriteString(fmt.Sprintf("  %s - %v\n", k, v))
+	}
+	sb.WriteString(fmt.Sprintf("ALL enabled: %v\n", all))
+	return sb.String()
+}