| Stephane Barbarie | 4a2564d | 2018-07-26 11:02:58 -0400 | [diff] [blame^] | 1 | package model |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "crypto/md5" |
| 6 | "fmt" |
| 7 | "reflect" |
| 8 | "sort" |
| 9 | ) |
| 10 | |
| 11 | var ( |
| 12 | RevisionCache = make(map[string]interface{}) |
| 13 | ) |
| 14 | |
| 15 | type Revision struct { |
| 16 | Config *DataRevision |
| 17 | Children map[string][]*Revision |
| 18 | Hash string |
| 19 | branch *Branch |
| 20 | WeakRef string |
| 21 | } |
| 22 | |
| 23 | func NewRevision(branch *Branch, data interface{}, children map[string][]*Revision) *Revision { |
| 24 | cr := &Revision{} |
| 25 | cr.branch = branch |
| 26 | cr.Config = NewDataRevision(data) |
| 27 | cr.Children = children |
| 28 | cr.finalize() |
| 29 | |
| 30 | return cr |
| 31 | } |
| 32 | |
| 33 | func (cr *Revision) finalize() { |
| 34 | cr.Hash = cr.hashContent() |
| 35 | |
| 36 | if _, exists := RevisionCache[cr.Hash]; !exists { |
| 37 | RevisionCache[cr.Hash] = cr |
| 38 | } |
| 39 | if _, exists := RevisionCache[cr.Config.Hash]; !exists { |
| 40 | RevisionCache[cr.Config.Hash] = cr.Config |
| 41 | } else { |
| 42 | cr.Config = RevisionCache[cr.Config.Hash].(*DataRevision) |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | func (cr *Revision) hashContent() string { |
| 47 | var buffer bytes.Buffer |
| 48 | var childrenKeys []string |
| 49 | |
| 50 | if cr.Config != nil { |
| 51 | buffer.WriteString(cr.Config.Hash) |
| 52 | } |
| 53 | |
| 54 | for key, _ := range cr.Children { |
| 55 | childrenKeys = append(childrenKeys, key) |
| 56 | } |
| 57 | sort.Strings(childrenKeys) |
| 58 | |
| 59 | if cr.Children != nil && len(cr.Children) > 0 { |
| 60 | // Loop through sorted Children keys |
| 61 | for _, key := range childrenKeys { |
| 62 | for _, child := range cr.Children[key] { |
| 63 | buffer.WriteString(child.Hash) |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | return fmt.Sprintf("%x", md5.Sum(buffer.Bytes()))[:12] |
| 69 | } |
| 70 | |
| 71 | func (cr *Revision) getData() interface{} { |
| 72 | if cr.Config == nil { |
| 73 | return nil |
| 74 | } |
| 75 | return cr.Config.Data |
| 76 | } |
| 77 | |
| 78 | func (cr *Revision) getNode() *Node { |
| 79 | return cr.branch.node |
| 80 | } |
| 81 | |
| 82 | func (cr *Revision) getType() reflect.Type { |
| 83 | // TODO: what is this returning really? |
| 84 | return reflect.TypeOf(cr.getData()) |
| 85 | } |
| 86 | |
| 87 | func (cr *Revision) clearHash() { |
| 88 | cr.Hash = "" |
| 89 | } |
| 90 | |
| 91 | func (cr *Revision) Get(depth int) interface{} { |
| 92 | originalData := cr.getData() |
| 93 | data := Clone(originalData) |
| 94 | |
| 95 | if depth > 0 { |
| 96 | for fieldName, field := range ChildrenFields(cr.getType()) { |
| 97 | if field.IsContainer { |
| 98 | for _, rev := range cr.Children[fieldName] { |
| 99 | childData := rev.Get(depth - 1) |
| 100 | childDataHolder := GetAttributeValue(data, fieldName, 0) |
| 101 | // TODO: merge with childData |
| 102 | fmt.Printf("data:%+v, dataHolder:%+v", childData, childDataHolder) |
| 103 | } |
| 104 | } else { |
| 105 | rev := cr.Children[fieldName][0] |
| 106 | childData := rev.Get(depth - 1) |
| 107 | childDataHolder := GetAttributeValue(data, fieldName, 0) |
| 108 | // TODO: merge with childData |
| 109 | fmt.Printf("data:%+v, dataHolder:%+v", childData, childDataHolder) |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | return data |
| 114 | } |
| 115 | |
| 116 | func (cr *Revision) UpdateData(data interface{}, branch *Branch) *Revision { |
| 117 | newRev := Clone(cr).(*Revision) |
| 118 | newRev.branch = branch |
| 119 | newRev.Config = data.(*DataRevision) |
| 120 | newRev.finalize() |
| 121 | |
| 122 | return newRev |
| 123 | } |
| 124 | |
| 125 | func (cr *Revision) UpdateChildren(name string, children []*Revision, branch *Branch) *Revision { |
| 126 | newChildren := Clone(cr.Children).(map[string][]*Revision) |
| 127 | newChildren[name] = children |
| 128 | newRev := Clone(cr).(*Revision) |
| 129 | newRev.branch = branch |
| 130 | newRev.Children = newChildren |
| 131 | newRev.finalize() |
| 132 | |
| 133 | return newRev |
| 134 | } |
| 135 | |
| 136 | func (cr *Revision) UpdateAllChildren(children map[string][]*Revision, branch *Branch) *Revision { |
| 137 | newRev := Clone(cr).(*Revision) |
| 138 | newRev.branch = branch |
| 139 | newRev.Children = children |
| 140 | newRev.finalize() |
| 141 | |
| 142 | return newRev |
| 143 | } |