updated hlog

hlog/config.go

@@ -0,0 +1,55 @@
+package hlog
+
+import (
+	"git.haelnorr.com/h/golib/env"
+	"github.com/pkg/errors"
+)
+
+// Config holds the configuration settings for the logger.
+// It can be populated from environment variables using ConfigFromEnv
+// or created programmatically.
+type Config struct {
+	LogLevel    Level  // ENV LOG_LEVEL: Log level for the logger - trace, debug, info, warn, error, fatal, panic (default: info)
+	LogOutput   string // ENV LOG_OUTPUT: Output destination for logs - console, file, or both (default: console)
+	LogDir      string // ENV LOG_DIR: Directory path for log files (required when LOG_OUTPUT is "file" or "both")
+	LogFileName string // ENV LOG_FILE_NAME: Name of the log file (required when LOG_OUTPUT is "file" or "both")
+	LogAppend   bool   // ENV LOG_APPEND: Append to existing log file or overwrite (default: true)
+}
+
+// ConfigFromEnv loads logger configuration from environment variables.
+//
+// Environment variables:
+//   - LOG_LEVEL: Log level (trace, debug, info, warn, error, fatal, panic) - default: info
+//   - LOG_OUTPUT: Output destination (console, file, both) - default: console
+//   - LOG_DIR: Directory for log files (required when LOG_OUTPUT is "file" or "both")
+//
+// Returns an error if:
+//   - LOG_LEVEL contains an invalid value
+//   - LOG_OUTPUT contains an invalid value
+//   - LogDir or LogFileName is not set and file logging is enabled
+func ConfigFromEnv() (*Config, error) {
+	logLevel, err := LogLevel(env.String("LOG_LEVEL", "info"))
+	if err != nil {
+		return nil, errors.Wrap(err, "LogLevel")
+	}
+	logOutput := env.String("LOG_OUTPUT", "console")
+	if logOutput != "both" && logOutput != "console" && logOutput != "file" {
+		return nil, errors.Errorf("Invalid LOG_OUTPUT: %s", logOutput)
+	}
+	cfg := &Config{
+		LogLevel:    logLevel,
+		LogOutput:   logOutput,
+		LogDir:      env.String("LOG_DIR", ""),
+		LogFileName: env.String("LOG_FILE_NAME", ""),
+		LogAppend:   env.Bool("LOG_APPEND", true),
+	}
+	if cfg.LogOutput != "console" {
+		if cfg.LogDir == "" {
+			return nil, errors.New("LOG_DIR not set but file logging enabled")
+		}
+		if cfg.LogFileName == "" {
+			return nil, errors.New("LOG_FILE_NAME not set but file logging enabled")
+		}
+	}
+	return cfg, nil
+}