feat(config): add log sink support

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/policy/policy.go

@@ -6,12 +6,15 @@ import (
 	"fmt"
 	"io"
 	"log/slog"
+	"os"
 	"sync/atomic"
 
+	"github.com/TecharoHQ/anubis/internal"
 	"github.com/TecharoHQ/anubis/lib/config"
 	"github.com/TecharoHQ/anubis/lib/policy/checker"
 	"github.com/TecharoHQ/anubis/lib/store"
 	"github.com/TecharoHQ/anubis/lib/thoth"
+	"github.com/fahedouch/go-logrotate"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 
@@ -38,6 +41,7 @@ type ParsedConfig struct {
 	StatusCodes       config.StatusCodes
 	DefaultDifficulty int
 	DNSBL             bool
+	Logger            *slog.Logger
 }
 
 func newParsedConfig(orig *config.Config) *ParsedConfig {
@@ -48,7 +52,7 @@ func newParsedConfig(orig *config.Config) *ParsedConfig {
 	}
 }
 
-func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDifficulty int) (*ParsedConfig, error) {
+func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDifficulty int, logLevel string) (*ParsedConfig, error) {
 	c, err := config.Load(fin, fname)
 	if err != nil {
 		return nil, err
@@ -202,6 +206,27 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 		validationErrs = append(validationErrs, config.ErrUnknownStoreBackend)
 	}
 
+	if c.Logging.Level != nil {
+		logLevel = c.Logging.Level.String()
+	}
+
+	switch c.Logging.Sink {
+	case config.LogSinkStdio:
+		result.Logger = internal.InitSlog(logLevel, os.Stderr)
+	case config.LogSinkFile:
+		out := &logrotate.Logger{
+			Filename:           c.Logging.Parameters.Filename,
+			FilenameTimeFormat: c.Logging.Parameters.OldFileTimeFormat,
+			MaxBytes:           c.Logging.Parameters.MaxBytes,
+			MaxAge:             c.Logging.Parameters.MaxAge,
+			MaxBackups:         c.Logging.Parameters.MaxBackups,
+			LocalTime:          c.Logging.Parameters.UseLocalTime,
+			Compress:           c.Logging.Parameters.Compress,
+		}
+
+		result.Logger = internal.InitSlog(logLevel, out)
+	}
+
 	if len(validationErrs) > 0 {
 		return nil, fmt.Errorf("errors validating policy config JSON %s: %w", fname, errors.Join(validationErrs...))
 	}