feat: implement separate log levels for console and file output

- Console logger respects user-specified log level
- File logger always uses DEBUG level to capture all logs
- Add custom leveledMultiWriter for different output levels
- Remove global log level setting for more granular control

internal/version/VERSION

@@ -1 +1 @@
-v5.0.0-beta-2506091718
+v5.0.0-beta-2506091916

logger.go

@@ -24,7 +24,6 @@ func InitLogger(logLevel string, logJSON bool) {
 
 	// init log writers
 	var msg string
-	var writers []io.Writer
 
 	// console writer
 	var consoleWriter io.Writer
@@ -46,7 +45,9 @@ func InitLogger(logLevel string, logJSON bool) {
 		consoleWriter = os.Stderr
 		msg = "log with json console and file output"
 	}
-	writers = append(writers, consoleWriter)
+
+	// parse console log level
+	consoleLevel := parseLogLevel(logLevel)
 
 	// file writer - write to results/taskID/hrp.log
 	cfg := config.GetConfig()
@@ -55,33 +56,97 @@ func InitLogger(logLevel string, logJSON bool) {
 	// create or open log file
 	logFile, err := os.OpenFile(logFilePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o666)
 	if err != nil {
+		// if file creation failed, use console logger only
+		log.Logger = zerolog.New(consoleWriter).With().Timestamp().Logger().Level(consoleLevel)
 		log.Error().Err(err).Str("logFilePath", logFilePath).Msg("create log file failed")
 	} else {
-		// add file writer to writers list
+		// create a custom writer that applies different log levels
-		writers = append(writers, logFile)
+		multiWriter := &leveledMultiWriter{
+			consoleWriter: consoleWriter,
+			consoleLevel:  consoleLevel,
+			fileWriter:    logFile,
+			fileLevel:     zerolog.DebugLevel,
+		}
+		log.Logger = zerolog.New(multiWriter).With().Timestamp().Logger()
 		log.Info().Str("logFilePath", logFilePath).Msg("log file created successfully")
 	}
 
-	// create multi writer to write to both console and file
-	multiWriter := io.MultiWriter(writers...)
-	log.Logger = zerolog.New(multiWriter).With().Timestamp().Logger()
 	log.Info().Msg(msg)
+	log.Info().Str("console_log_level", strings.ToUpper(logLevel)).Str("file_log_level", "DEBUG").Msg("logger initialized with different levels")
+}
 
-	// Setting Global Log Level
+// parseLogLevel converts string log level to zerolog.Level
+func parseLogLevel(logLevel string) zerolog.Level {
 	level := strings.ToUpper(logLevel)
-	log.Info().Str("log_level", level).Msg("set global log level")
 	switch level {
 	case "DEBUG":
-		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+		return zerolog.DebugLevel
 	case "INFO":
-		zerolog.SetGlobalLevel(zerolog.InfoLevel)
+		return zerolog.InfoLevel
 	case "WARN":
-		zerolog.SetGlobalLevel(zerolog.WarnLevel)
+		return zerolog.WarnLevel
 	case "ERROR":
-		zerolog.SetGlobalLevel(zerolog.ErrorLevel)
+		return zerolog.ErrorLevel
 	case "FATAL":
-		zerolog.SetGlobalLevel(zerolog.FatalLevel)
+		return zerolog.FatalLevel
 	case "PANIC":
-		zerolog.SetGlobalLevel(zerolog.PanicLevel)
+		return zerolog.PanicLevel
+	default:
+		return zerolog.InfoLevel
 	}
 }
+
+// leveledMultiWriter is a custom writer that applies different log levels to different outputs
+type leveledMultiWriter struct {
+	consoleWriter io.Writer
+	consoleLevel  zerolog.Level
+	fileWriter    io.Writer
+	fileLevel     zerolog.Level
+}
+
+func (w *leveledMultiWriter) Write(p []byte) (n int, err error) {
+	// Parse the log level from the JSON log entry
+	logLevel := extractLogLevel(p)
+
+	var writeErrors []error
+
+	// Write to console if log level meets console threshold
+	if logLevel >= w.consoleLevel {
+		if _, err := w.consoleWriter.Write(p); err != nil {
+			writeErrors = append(writeErrors, err)
+		}
+	}
+
+	// Write to file if log level meets file threshold (always debug, so always write)
+	if logLevel >= w.fileLevel {
+		if _, err := w.fileWriter.Write(p); err != nil {
+			writeErrors = append(writeErrors, err)
+		}
+	}
+
+	// Return the length of the original message and any write errors
+	if len(writeErrors) > 0 {
+		return len(p), writeErrors[0]
+	}
+	return len(p), nil
+}
+
+// extractLogLevel extracts the log level from a JSON log entry
+func extractLogLevel(p []byte) zerolog.Level {
+	// Simple parsing to extract level from JSON
+	logStr := string(p)
+	if strings.Contains(logStr, `"level":"debug"`) {
+		return zerolog.DebugLevel
+	} else if strings.Contains(logStr, `"level":"info"`) {
+		return zerolog.InfoLevel
+	} else if strings.Contains(logStr, `"level":"warn"`) {
+		return zerolog.WarnLevel
+	} else if strings.Contains(logStr, `"level":"error"`) {
+		return zerolog.ErrorLevel
+	} else if strings.Contains(logStr, `"level":"fatal"`) {
+		return zerolog.FatalLevel
+	} else if strings.Contains(logStr, `"level":"panic"`) {
+		return zerolog.PanicLevel
+	}
+	return zerolog.InfoLevel // default
+}