add logging interface for user specified loggers, such as logrus

rest/access_log_apache.go

@@ -57,7 +57,7 @@ type AccessLogApacheMiddleware struct {
 
 	// Logger points to the logger object used by this middleware, it defaults to
 	// log.New(os.Stderr, "", 0).
-	Logger *log.Logger
+	Logger Logger
 
 	// Format defines the format of the access log record. See AccessLogFormat for the details.
 	// It defaults to DefaultLogFormat.

rest/access_log_json.go

@@ -14,7 +14,7 @@ type AccessLogJsonMiddleware struct {
 
 	// Logger points to the logger object used by this middleware, it defaults to
 	// log.New(os.Stderr, "", 0).
-	Logger *log.Logger
+	Logger Logger
 }
 
 // MiddlewareFunc makes AccessLogJsonMiddleware implement the Middleware interface.

rest/middleware.go

@@ -70,3 +70,11 @@ func adapterFunc(handler HandlerFunc) http.HandlerFunc {
 		handler(writer, request)
 	}
 }
+
+// Logging interface which *log.Logger uses. Allows injection of user specified loggers.
+type Logger interface {
+	Print(v ...interface{})
+	Printf(format string, v ...interface{})
+	Println(v ...interface{})
+	Fatalf(format string, v ...interface{})
+}

rest/recover.go

@@ -15,7 +15,7 @@ type RecoverMiddleware struct {
 
 	// Custom logger used for logging the panic errors,
 	// optional, defaults to log.New(os.Stderr, "", 0)
-	Logger *log.Logger
+	Logger Logger
 
 	// If true, the log records will be printed as JSON. Convenient for log parsing.
 	EnableLogAsJson bool