generic json for fix messages

src/client/fix/dict.go

@@ -0,0 +1,113 @@
+package fix
+
+import (
+	"log/slog"
+	"time"
+
+	"quantex.com/qfixdpl/src/common/tracerr"
+)
+
+// FixField identifies a single FIX field by its dictionary metadata.
+type FixField struct {
+	Name string
+	Tag  int
+	Type string
+}
+
+// FieldValue is the typed value for a FIX field.
+type FieldValue interface{}
+
+// FieldMap is the enriched representation of a FIX FieldMap (header, body, or trailer).
+type FieldMap map[FixField]FieldValue
+
+// GetMap converts a FieldMap into a JSON-friendly map keyed by field name.
+func GetMap(fieldMap FieldMap) map[string]interface{} {
+	result := map[string]interface{}{}
+
+	for f, v := range fieldMap {
+		k, val := GetKeyValue(f, v)
+		result[k] = val
+	}
+
+	return result
+}
+
+//nolint:funlen,gocyclo,cyclop //it's long but easy to read
+func GetKeyValue(f FixField, value FieldValue) (key string, val interface{}) {
+	key = f.Name
+
+	switch f.Type {
+	case "NUMINGROUP":
+		var groups []map[string]interface{}
+
+		fMapLst, ok := value.([]FieldMap)
+		if !ok {
+			err := tracerr.Errorf("could not parse as []FieldMap, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		for _, fieldMap := range fMapLst {
+			groups = append(groups, GetMap(fieldMap))
+		}
+
+		val = groups
+	case "BOOLEAN":
+		b, ok := value.(bool)
+		if !ok {
+			err := tracerr.Errorf("could not parse as bool, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = b
+	case "INT":
+		i, ok := value.(int)
+		if !ok {
+			err := tracerr.Errorf("could not parse as int, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = i
+	case "SEQNUM":
+		i, ok := value.(int)
+		if !ok {
+			err := tracerr.Errorf("could not parse as int, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = i
+	case "UTCTIMESTAMP":
+		t, ok := value.(time.Time)
+		if !ok {
+			err := tracerr.Errorf("could not parse as Time, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = t
+	case "STRING":
+		s, ok := value.(string)
+		if !ok {
+			err := tracerr.Errorf("could not parse as string, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = s
+	case "CHAR":
+		s, ok := value.(string)
+		if !ok {
+			err := tracerr.Errorf("could not parse as string, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = s
+	default:
+		s, ok := value.(string)
+		if !ok {
+			err := tracerr.Errorf("could not parse as string, value: %+v", value)
+			slog.Error(err.Error())
+		}
+
+		val = s
+	}
+
+	return key, val
+}