Add promo code event logger [WG-1202]

logger/const.go

@@ -14,13 +14,15 @@ const (
 	ultronExFileName        = "ultronex.{{env}}.log"
 	partnerRequestsFileName = "partner_requests.{{env}}.log"
 	requestsFileName        = "requests.{{env}}.log"
+	promoCodeEventsFileName = "promocode_events.{{env}}.log"
 	defaultReplacement      = "[Filtered by Wego]"
 	defaultMaskChar         = "*"
 	arrayKey                = "[]"
 
 	logTypeUltronex       logType = "ultronEx"
 	logTypePartnerRequest logType = "partnerRequest"
 	logTypeRequest        logType = "request"
+	logTypePromoCodeEvent logType = "promoCodeEvent"
 
 	contextKeyRequest     contextKey = "request"
 	contextKeyRequestType contextKey = "requestType"

logger/logger.go

@@ -74,9 +74,24 @@ func LogRequest(log *Request) {
 	}
 }
 
+// LogPromoCodeEvent logs a promo-code event to a local file.
+// The event is logged as a flat JSON object (key/value pairs).
+func LogPromoCodeEvent(fields map[string]any) {
+	logger := loggers[logTypePromoCodeEvent]
+	if logger == nil || len(fields) == 0 {
+		return
+	}
+
+	zapFields := make([]zap.Field, 0, len(fields))
+	for key, value := range fields {
+		zapFields = append(zapFields, zap.Any(key, value))
+	}
+	logger.Info("", zapFields...)
+}
+
 // Init initializes loggers
 func Init() error {
-	loggers = make(map[logType]*zap.Logger, 2)
+	loggers = make(map[logType]*zap.Logger, 4)
 
 	uLog, err := initLogger(ultronExFileName)
 	if err != nil {
@@ -95,6 +110,12 @@ func Init() error {
 		return errors.New("cannot init request logger", err)
 	}
 	loggers[logTypeRequest] = rLog
+
+	pcLog, err := initLogger(promoCodeEventsFileName)
+	if err != nil {
+		return errors.New("cannot init promo code event logger", err)
+	}
+	loggers[logTypePromoCodeEvent] = pcLog
 	return nil
 }