refactor: move accesslog to logging/accesslog

internal/logging/accesslog/config.go

@@ -0,0 +1,71 @@
+package accesslog
+
+import (
+	"github.com/yusing/go-proxy/internal/gperr"
+	"github.com/yusing/go-proxy/internal/utils"
+)
+
+type (
+	Format  string
+	Filters struct {
+		StatusCodes LogFilter[*StatusCodeRange] `json:"status_codes"`
+		Method      LogFilter[HTTPMethod]       `json:"method"`
+		Host        LogFilter[Host]             `json:"host"`
+		Headers     LogFilter[*HTTPHeader]      `json:"headers"` // header exists or header == value
+		CIDR        LogFilter[*CIDR]            `json:"cidr"`
+	}
+	Fields struct {
+		Headers FieldConfig `json:"headers"`
+		Query   FieldConfig `json:"query"`
+		Cookies FieldConfig `json:"cookies"`
+	}
+	Config struct {
+		BufferSize int        `json:"buffer_size"`
+		Format     Format     `json:"format" validate:"oneof=common combined json"`
+		Path       string     `json:"path"`
+		Stdout     bool       `json:"stdout"`
+		Filters    Filters    `json:"filters"`
+		Fields     Fields     `json:"fields"`
+		Retention  *Retention `json:"retention"`
+	}
+)
+
+var (
+	FormatCommon   Format = "common"
+	FormatCombined Format = "combined"
+	FormatJSON     Format = "json"
+
+	AvailableFormats = []Format{FormatCommon, FormatCombined, FormatJSON}
+)
+
+const DefaultBufferSize = 64 * kilobyte // 64KB
+
+func (cfg *Config) Validate() gperr.Error {
+	if cfg.Path == "" && !cfg.Stdout {
+		return gperr.New("path or stdout is required")
+	}
+	return nil
+}
+
+func DefaultConfig() *Config {
+	return &Config{
+		BufferSize: DefaultBufferSize,
+		Format:     FormatCombined,
+		Retention:  &Retention{Days: 30},
+		Fields: Fields{
+			Headers: FieldConfig{
+				Default: FieldModeDrop,
+			},
+			Query: FieldConfig{
+				Default: FieldModeKeep,
+			},
+			Cookies: FieldConfig{
+				Default: FieldModeDrop,
+			},
+		},
+	}
+}
+
+func init() {
+	utils.RegisterDefaultValueFactory(DefaultConfig)
+}