| 1 | package transcript |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "reflect" |
| 6 | "strconv" |
| 7 | "strings" |
| 8 | ) |
| 9 | |
| 10 | // mapContentStrings copies metadata while sharing immutable strings. Large |
| 11 | // bodies are replaced before JSON encoding, so page/content reads never |
| 12 | // serialize an entire tool payload just to return one small chunk. |
| 13 | func mapContentStrings(value reflect.Value, path []string, visit func(string, []string) string) reflect.Value { |
| 14 | switch value.Kind() { |
| 15 | case reflect.String: |
| 16 | out := reflect.New(value.Type()).Elem() |
| 17 | out.SetString(visit(value.String(), path)) |
| 18 | return out |
| 19 | case reflect.Pointer, reflect.Interface: |
| 20 | if value.IsNil() { |
| 21 | return value |
| 22 | } |
| 23 | child := mapContentStrings(value.Elem(), path, visit) |
| 24 | out := reflect.New(value.Type()).Elem() |
| 25 | if value.Kind() == reflect.Pointer { |
| 26 | pointer := reflect.New(value.Type().Elem()) |
| 27 | pointer.Elem().Set(child) |
| 28 | out.Set(pointer) |
| 29 | } else { |
| 30 | out.Set(child) |
| 31 | } |
| 32 | return out |
| 33 | case reflect.Struct: |
| 34 | out := reflect.New(value.Type()).Elem() |
| 35 | out.Set(value) |
| 36 | for i := range value.NumField() { |
| 37 | field := value.Type().Field(i) |
| 38 | name := strings.Split(field.Tag.Get("json"), ",")[0] |
| 39 | if field.PkgPath != "" || name == "-" { |
| 40 | continue |
| 41 | } |
| 42 | if name == "" { |
| 43 | name = field.Name |
| 44 | } |
| 45 | out.Field(i).Set(mapContentStrings(value.Field(i), appendPath(path, name), visit)) |
| 46 | } |
| 47 | return out |
| 48 | case reflect.Slice, reflect.Array: |
| 49 | if value.Kind() == reflect.Slice && value.IsNil() { |
| 50 | return value |
| 51 | } |
| 52 | var out reflect.Value |
| 53 | if value.Kind() == reflect.Slice { |
| 54 | out = reflect.MakeSlice(value.Type(), value.Len(), value.Len()) |
| 55 | } else { |
| 56 | out = reflect.New(value.Type()).Elem() |
| 57 | } |
| 58 | for i := range value.Len() { |
| 59 | out.Index(i).Set(mapContentStrings(value.Index(i), appendPath(path, strconv.Itoa(i)), visit)) |
| 60 | } |
| 61 | return out |
| 62 | case reflect.Map: |
| 63 | if value.IsNil() { |
| 64 | return value |
| 65 | } |
| 66 | out := reflect.MakeMapWithSize(value.Type(), value.Len()) |
| 67 | for iterator := value.MapRange(); iterator.Next(); { |
| 68 | out.SetMapIndex(iterator.Key(), mapContentStrings(iterator.Value(), appendPath(path, fmt.Sprint(iterator.Key().Interface())), visit)) |
| 69 | } |
| 70 | return out |
| 71 | default: |
| 72 | return value |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | func appendPath(path []string, key string) []string { |
| 77 | return append(append([]string(nil), path...), key) |
| 78 | } |
| 79 | |
| 80 | func contentStringAt(message Message, path []string) (string, bool) { |
| 81 | value := reflect.ValueOf(message) |
| 82 | for _, part := range path { |
| 83 | for value.IsValid() && (value.Kind() == reflect.Pointer || value.Kind() == reflect.Interface) { |
| 84 | if value.IsNil() { |
| 85 | return "", false |
| 86 | } |
| 87 | value = value.Elem() |
| 88 | } |
| 89 | if !value.IsValid() { |
| 90 | return "", false |
| 91 | } |
| 92 | switch value.Kind() { |
| 93 | case reflect.Struct: |
| 94 | var child reflect.Value |
| 95 | for i := range value.NumField() { |
| 96 | field := value.Type().Field(i) |
| 97 | name := strings.Split(field.Tag.Get("json"), ",")[0] |
| 98 | if name == "" { |
| 99 | name = field.Name |
| 100 | } |
| 101 | if field.PkgPath == "" && name != "-" && name == part { |
| 102 | child = value.Field(i) |
| 103 | break |
| 104 | } |
| 105 | } |
| 106 | value = child |
| 107 | case reflect.Slice, reflect.Array: |
| 108 | index, err := strconv.Atoi(part) |
| 109 | if err != nil || index < 0 || index >= value.Len() { |
| 110 | return "", false |
| 111 | } |
| 112 | value = value.Index(index) |
| 113 | case reflect.Map: |
| 114 | if value.Type().Key().Kind() != reflect.String { |
| 115 | return "", false |
| 116 | } |
| 117 | key := reflect.New(value.Type().Key()).Elem() |
| 118 | key.SetString(part) |
| 119 | value = value.MapIndex(key) |
| 120 | default: |
| 121 | return "", false |
| 122 | } |
| 123 | } |
| 124 | if !value.IsValid() || value.Kind() != reflect.String { |
| 125 | return "", false |
| 126 | } |
| 127 | return value.String(), true |
| 128 | } |
| 129 | |
| 130 | func retainedBytes(value reflect.Value) int { |
| 131 | if !value.IsValid() { |
| 132 | return 0 |
| 133 | } |
| 134 | size := int(value.Type().Size()) |
| 135 | switch value.Kind() { |
| 136 | case reflect.String: |
| 137 | return size + value.Len() |
| 138 | case reflect.Pointer, reflect.Interface: |
| 139 | if !value.IsNil() { |
| 140 | size += retainedBytes(value.Elem()) |
| 141 | } |
| 142 | case reflect.Struct: |
| 143 | for i := range value.NumField() { |
| 144 | size += retainedBytes(value.Field(i)) |
| 145 | } |
| 146 | case reflect.Slice, reflect.Array: |
| 147 | for i := range value.Len() { |
| 148 | size += retainedBytes(value.Index(i)) |
| 149 | } |
| 150 | case reflect.Map: |
| 151 | for iterator := value.MapRange(); iterator.Next(); { |
| 152 | size += 64 + retainedBytes(iterator.Key()) + retainedBytes(iterator.Value()) |
| 153 | } |
| 154 | } |
| 155 | return size |
| 156 | } |
| 157 |