Migrate to go project layout, replace logrus with slog, fix some errors

internal/log/log.go

@@ -0,0 +1,158 @@
+package log
+
+import (
+	"bufio"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"time"
+)
+
+// Handler exposes slog handler struct.
+var Handler slog.Handler
+var Ctx = context.Background()
+var Writer io.Writer
+var reader io.Reader
+
+// Init setup logger stuff.
+// level can be error, warn, info, debug if something other supplied info level selected.
+// fileDescriptor should be opened before supplying it to Init().
+func Init(level string, fileDescriptor *os.File) {
+	var loglevel slog.Level
+
+	// no panic, no trace.
+	switch level {
+	case "debug":
+		loglevel = slog.LevelDebug
+
+	case "info":
+		loglevel = slog.LevelInfo
+
+	case "warn":
+		loglevel = slog.LevelWarn
+
+	case "error":
+		loglevel = slog.LevelError
+
+	default:
+		loglevel = slog.LevelInfo
+	}
+
+	opts := &slog.HandlerOptions{ //nolint: exhaustruct
+		// Use the ReplaceAttr function on the handler options
+		// to be able to replace any single attribute in the log output
+		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr { //nolint: revive
+			// check that we are handling the time key
+			if a.Key != slog.TimeKey {
+				return a
+			}
+
+			t := a.Value.Time()
+
+			// change the value from a time.Time to a String
+			// where the string has the correct time format.
+			a.Value = slog.StringValue(t.Format(time.DateTime))
+
+			return a
+		},
+
+		Level: loglevel,
+	}
+
+	Handler = slog.NewTextHandler(fileDescriptor, opts)
+
+	slog.SetDefault(
+		slog.New(Handler),
+	)
+
+	reader, Writer = io.Pipe()
+
+	go readIoPipe()
+}
+
+// readIoPipe reads pipe and writes it to slog.
+func readIoPipe() {
+	scanner := bufio.NewScanner(reader)
+
+	for {
+		for scanner.Scan() {
+			line := scanner.Text() // Get the current line as a string
+			slog.Debug(line)
+		}
+
+		if err := scanner.Err(); err != nil {
+			// io.EOF is expected when done reading, e.g. on exit.
+			if errors.Is(err, io.EOF) {
+				return
+			}
+
+			// something weird happen, we should it log to guess later what it was.
+			Errorf("Error during scanning log writer pipe: %v\n", err)
+		}
+	}
+}
+
+// GetLevel returns current loglevel.
+func GetLevel() string {
+	switch {
+	case Handler.Enabled(Ctx, slog.LevelDebug):
+		return "debug"
+
+	case Handler.Enabled(Ctx, slog.LevelInfo):
+		return "info"
+
+	case Handler.Enabled(Ctx, slog.LevelWarn):
+		return "warn"
+
+	case Handler.Enabled(Ctx, slog.LevelError):
+		return "error"
+
+	default:
+		return "unknown"
+	}
+}
+
+// Error passes message directly to slog.Error().
+func Error(message string) {
+	slog.Error(message)
+}
+
+// Errorf logs message on error log level and allows to supply arguments in printf() style.
+func Errorf(format string, a ...any) {
+	slog.Error(fmt.Sprintf(format, a...))
+}
+
+// Warn passes message directly to slog.Warn().
+func Warn(message string) {
+	slog.Warn(message)
+}
+
+// Warnf logs message on warn log level and allows to supply arguments in printf() style.
+func Warnf(format string, a ...any) {
+	slog.Warn(fmt.Sprintf(format, a...))
+}
+
+// Info passes message directly to slog.Info().
+func Info(message string) {
+	slog.Info(message)
+}
+
+// Infof logs message on info log level and allows to supply arguments in printf() style.
+func Infof(format string, a ...any) {
+	slog.Info(fmt.Sprintf(format, a...))
+}
+
+// Debug passes message directly to slog.Debug().
+func Debug(message string) {
+	slog.Debug(message)
+}
+
+// Debugf logs message on debug log level and allows to supply arguments in printf() style.
+func Debugf(format string, a ...any) {
+	slog.Debug(fmt.Sprintf(format, a...))
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */