Scott Baker | 1fe7273 | 2019-10-21 10:58:51 -0700 | [diff] [blame] | 1 | package dynamic |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "reflect" |
| 6 | |
| 7 | "github.com/golang/protobuf/proto" |
| 8 | |
| 9 | "github.com/jhump/protoreflect/desc" |
| 10 | ) |
| 11 | |
| 12 | // Equal returns true if the given two dynamic messages are equal. Two messages are equal when they |
| 13 | // have the same message type and same fields set to equal values. For proto3 messages, fields set |
| 14 | // to their zero value are considered unset. |
| 15 | func Equal(a, b *Message) bool { |
| 16 | if a.md.GetFullyQualifiedName() != b.md.GetFullyQualifiedName() { |
| 17 | return false |
| 18 | } |
| 19 | if len(a.values) != len(b.values) { |
| 20 | return false |
| 21 | } |
| 22 | if len(a.unknownFields) != len(b.unknownFields) { |
| 23 | return false |
| 24 | } |
| 25 | for tag, aval := range a.values { |
| 26 | bval, ok := b.values[tag] |
| 27 | if !ok { |
| 28 | return false |
| 29 | } |
| 30 | if !fieldsEqual(aval, bval) { |
| 31 | return false |
| 32 | } |
| 33 | } |
| 34 | for tag, au := range a.unknownFields { |
| 35 | bu, ok := b.unknownFields[tag] |
| 36 | if !ok { |
| 37 | return false |
| 38 | } |
| 39 | if len(au) != len(bu) { |
| 40 | return false |
| 41 | } |
| 42 | for i, aval := range au { |
| 43 | bval := bu[i] |
| 44 | if aval.Encoding != bval.Encoding { |
| 45 | return false |
| 46 | } |
| 47 | if aval.Encoding == proto.WireBytes || aval.Encoding == proto.WireStartGroup { |
| 48 | if !bytes.Equal(aval.Contents, bval.Contents) { |
| 49 | return false |
| 50 | } |
| 51 | } else if aval.Value != bval.Value { |
| 52 | return false |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | // all checks pass! |
| 57 | return true |
| 58 | } |
| 59 | |
| 60 | func fieldsEqual(aval, bval interface{}) bool { |
| 61 | arv := reflect.ValueOf(aval) |
| 62 | brv := reflect.ValueOf(bval) |
| 63 | if arv.Type() != brv.Type() { |
| 64 | // it is possible that one is a dynamic message and one is not |
| 65 | apm, ok := aval.(proto.Message) |
| 66 | if !ok { |
| 67 | return false |
| 68 | } |
| 69 | bpm, ok := bval.(proto.Message) |
| 70 | if !ok { |
| 71 | return false |
| 72 | } |
| 73 | return MessagesEqual(apm, bpm) |
| 74 | |
| 75 | } else { |
| 76 | switch arv.Kind() { |
| 77 | case reflect.Ptr: |
| 78 | apm, ok := aval.(proto.Message) |
| 79 | if !ok { |
| 80 | // Don't know how to compare pointer values that aren't messages! |
| 81 | // Maybe this should panic? |
| 82 | return false |
| 83 | } |
| 84 | bpm := bval.(proto.Message) // we know it will succeed because we know a and b have same type |
| 85 | return MessagesEqual(apm, bpm) |
| 86 | |
| 87 | case reflect.Map: |
| 88 | return mapsEqual(arv, brv) |
| 89 | |
| 90 | case reflect.Slice: |
| 91 | if arv.Type() == typeOfBytes { |
| 92 | return bytes.Equal(aval.([]byte), bval.([]byte)) |
| 93 | } else { |
| 94 | return slicesEqual(arv, brv) |
| 95 | } |
| 96 | |
| 97 | default: |
| 98 | return aval == bval |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | func slicesEqual(a, b reflect.Value) bool { |
| 104 | if a.Len() != b.Len() { |
| 105 | return false |
| 106 | } |
| 107 | for i := 0; i < a.Len(); i++ { |
| 108 | ai := a.Index(i) |
| 109 | bi := b.Index(i) |
| 110 | if !fieldsEqual(ai.Interface(), bi.Interface()) { |
| 111 | return false |
| 112 | } |
| 113 | } |
| 114 | return true |
| 115 | } |
| 116 | |
| 117 | // MessagesEqual returns true if the given two messages are equal. Use this instead of proto.Equal |
| 118 | // when one or both of the messages might be a dynamic message. |
| 119 | func MessagesEqual(a, b proto.Message) bool { |
| 120 | da, aok := a.(*Message) |
| 121 | db, bok := b.(*Message) |
| 122 | // Both dynamic messages |
| 123 | if aok && bok { |
| 124 | return Equal(da, db) |
| 125 | } |
| 126 | // Neither dynamic messages |
| 127 | if !aok && !bok { |
| 128 | return proto.Equal(a, b) |
| 129 | } |
| 130 | // Mixed |
| 131 | if aok { |
| 132 | md, err := desc.LoadMessageDescriptorForMessage(b) |
| 133 | if err != nil { |
| 134 | return false |
| 135 | } |
| 136 | db = NewMessageWithMessageFactory(md, da.mf) |
| 137 | if db.ConvertFrom(b) != nil { |
| 138 | return false |
| 139 | } |
| 140 | return Equal(da, db) |
| 141 | } else { |
| 142 | md, err := desc.LoadMessageDescriptorForMessage(a) |
| 143 | if err != nil { |
| 144 | return false |
| 145 | } |
| 146 | da = NewMessageWithMessageFactory(md, db.mf) |
| 147 | if da.ConvertFrom(a) != nil { |
| 148 | return false |
| 149 | } |
| 150 | return Equal(da, db) |
| 151 | } |
| 152 | } |