Elia Battiston | be9edc1 | 2022-03-09 11:35:58 +0100 | [diff] [blame] | 1 | // Copyright 2020 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package impl |
| 6 | |
| 7 | import ( |
| 8 | "fmt" |
| 9 | "reflect" |
| 10 | |
| 11 | "google.golang.org/protobuf/proto" |
| 12 | pref "google.golang.org/protobuf/reflect/protoreflect" |
| 13 | piface "google.golang.org/protobuf/runtime/protoiface" |
| 14 | ) |
| 15 | |
| 16 | type mergeOptions struct{} |
| 17 | |
| 18 | func (o mergeOptions) Merge(dst, src proto.Message) { |
| 19 | proto.Merge(dst, src) |
| 20 | } |
| 21 | |
| 22 | // merge is protoreflect.Methods.Merge. |
| 23 | func (mi *MessageInfo) merge(in piface.MergeInput) piface.MergeOutput { |
| 24 | dp, ok := mi.getPointer(in.Destination) |
| 25 | if !ok { |
| 26 | return piface.MergeOutput{} |
| 27 | } |
| 28 | sp, ok := mi.getPointer(in.Source) |
| 29 | if !ok { |
| 30 | return piface.MergeOutput{} |
| 31 | } |
| 32 | mi.mergePointer(dp, sp, mergeOptions{}) |
| 33 | return piface.MergeOutput{Flags: piface.MergeComplete} |
| 34 | } |
| 35 | |
| 36 | func (mi *MessageInfo) mergePointer(dst, src pointer, opts mergeOptions) { |
| 37 | mi.init() |
| 38 | if dst.IsNil() { |
| 39 | panic(fmt.Sprintf("invalid value: merging into nil message")) |
| 40 | } |
| 41 | if src.IsNil() { |
| 42 | return |
| 43 | } |
| 44 | for _, f := range mi.orderedCoderFields { |
| 45 | if f.funcs.merge == nil { |
| 46 | continue |
| 47 | } |
| 48 | sfptr := src.Apply(f.offset) |
| 49 | if f.isPointer && sfptr.Elem().IsNil() { |
| 50 | continue |
| 51 | } |
| 52 | f.funcs.merge(dst.Apply(f.offset), sfptr, f, opts) |
| 53 | } |
| 54 | if mi.extensionOffset.IsValid() { |
| 55 | sext := src.Apply(mi.extensionOffset).Extensions() |
| 56 | dext := dst.Apply(mi.extensionOffset).Extensions() |
| 57 | if *dext == nil { |
| 58 | *dext = make(map[int32]ExtensionField) |
| 59 | } |
| 60 | for num, sx := range *sext { |
| 61 | xt := sx.Type() |
| 62 | xi := getExtensionFieldInfo(xt) |
| 63 | if xi.funcs.merge == nil { |
| 64 | continue |
| 65 | } |
| 66 | dx := (*dext)[num] |
| 67 | var dv pref.Value |
| 68 | if dx.Type() == sx.Type() { |
| 69 | dv = dx.Value() |
| 70 | } |
| 71 | if !dv.IsValid() && xi.unmarshalNeedsValue { |
| 72 | dv = xt.New() |
| 73 | } |
| 74 | dv = xi.funcs.merge(dv, sx.Value(), opts) |
| 75 | dx.Set(sx.Type(), dv) |
| 76 | (*dext)[num] = dx |
| 77 | } |
| 78 | } |
| 79 | if mi.unknownOffset.IsValid() { |
| 80 | su := mi.getUnknownBytes(src) |
| 81 | if su != nil && len(*su) > 0 { |
| 82 | du := mi.mutableUnknownBytes(dst) |
| 83 | *du = append(*du, *su...) |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | func mergeScalarValue(dst, src pref.Value, opts mergeOptions) pref.Value { |
| 89 | return src |
| 90 | } |
| 91 | |
| 92 | func mergeBytesValue(dst, src pref.Value, opts mergeOptions) pref.Value { |
| 93 | return pref.ValueOfBytes(append(emptyBuf[:], src.Bytes()...)) |
| 94 | } |
| 95 | |
| 96 | func mergeListValue(dst, src pref.Value, opts mergeOptions) pref.Value { |
| 97 | dstl := dst.List() |
| 98 | srcl := src.List() |
| 99 | for i, llen := 0, srcl.Len(); i < llen; i++ { |
| 100 | dstl.Append(srcl.Get(i)) |
| 101 | } |
| 102 | return dst |
| 103 | } |
| 104 | |
| 105 | func mergeBytesListValue(dst, src pref.Value, opts mergeOptions) pref.Value { |
| 106 | dstl := dst.List() |
| 107 | srcl := src.List() |
| 108 | for i, llen := 0, srcl.Len(); i < llen; i++ { |
| 109 | sb := srcl.Get(i).Bytes() |
| 110 | db := append(emptyBuf[:], sb...) |
| 111 | dstl.Append(pref.ValueOfBytes(db)) |
| 112 | } |
| 113 | return dst |
| 114 | } |
| 115 | |
| 116 | func mergeMessageListValue(dst, src pref.Value, opts mergeOptions) pref.Value { |
| 117 | dstl := dst.List() |
| 118 | srcl := src.List() |
| 119 | for i, llen := 0, srcl.Len(); i < llen; i++ { |
| 120 | sm := srcl.Get(i).Message() |
| 121 | dm := proto.Clone(sm.Interface()).ProtoReflect() |
| 122 | dstl.Append(pref.ValueOfMessage(dm)) |
| 123 | } |
| 124 | return dst |
| 125 | } |
| 126 | |
| 127 | func mergeMessageValue(dst, src pref.Value, opts mergeOptions) pref.Value { |
| 128 | opts.Merge(dst.Message().Interface(), src.Message().Interface()) |
| 129 | return dst |
| 130 | } |
| 131 | |
| 132 | func mergeMessage(dst, src pointer, f *coderFieldInfo, opts mergeOptions) { |
| 133 | if f.mi != nil { |
| 134 | if dst.Elem().IsNil() { |
| 135 | dst.SetPointer(pointerOfValue(reflect.New(f.mi.GoReflectType.Elem()))) |
| 136 | } |
| 137 | f.mi.mergePointer(dst.Elem(), src.Elem(), opts) |
| 138 | } else { |
| 139 | dm := dst.AsValueOf(f.ft).Elem() |
| 140 | sm := src.AsValueOf(f.ft).Elem() |
| 141 | if dm.IsNil() { |
| 142 | dm.Set(reflect.New(f.ft.Elem())) |
| 143 | } |
| 144 | opts.Merge(asMessage(dm), asMessage(sm)) |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | func mergeMessageSlice(dst, src pointer, f *coderFieldInfo, opts mergeOptions) { |
| 149 | for _, sp := range src.PointerSlice() { |
| 150 | dm := reflect.New(f.ft.Elem().Elem()) |
| 151 | if f.mi != nil { |
| 152 | f.mi.mergePointer(pointerOfValue(dm), sp, opts) |
| 153 | } else { |
| 154 | opts.Merge(asMessage(dm), asMessage(sp.AsValueOf(f.ft.Elem().Elem()))) |
| 155 | } |
| 156 | dst.AppendPointerSlice(pointerOfValue(dm)) |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | func mergeBytes(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) { |
| 161 | *dst.Bytes() = append(emptyBuf[:], *src.Bytes()...) |
| 162 | } |
| 163 | |
| 164 | func mergeBytesNoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) { |
| 165 | v := *src.Bytes() |
| 166 | if len(v) > 0 { |
| 167 | *dst.Bytes() = append(emptyBuf[:], v...) |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | func mergeBytesSlice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) { |
| 172 | ds := dst.BytesSlice() |
| 173 | for _, v := range *src.BytesSlice() { |
| 174 | *ds = append(*ds, append(emptyBuf[:], v...)) |
| 175 | } |
| 176 | } |