khenaidoo | bf6e7bb | 2018-08-14 22:27:29 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
Stephane Barbarie | 4a2564d | 2018-07-26 11:02:58 -0400 | [diff] [blame] | 16 | package model |
| 17 | |
| 18 | import ( |
| 19 | "bytes" |
| 20 | "compress/gzip" |
| 21 | "encoding/json" |
| 22 | "fmt" |
| 23 | "github.com/golang/protobuf/proto" |
| 24 | "io/ioutil" |
| 25 | "reflect" |
| 26 | ) |
| 27 | |
| 28 | type PersistedRevision struct { |
| 29 | *Revision |
| 30 | Compress bool |
| 31 | kvStore *Backend |
| 32 | } |
| 33 | |
| 34 | func NewPersistedRevision(branch *Branch, data interface{}, children map[string][]*Revision) *PersistedRevision { |
| 35 | pr := &PersistedRevision{} |
| 36 | pr.kvStore = branch.node.root.KvStore |
| 37 | pr.Revision = NewRevision(branch, data, children) |
| 38 | return pr |
| 39 | } |
| 40 | |
| 41 | func (pr *PersistedRevision) finalize() { |
| 42 | pr.Revision.finalize() |
| 43 | pr.store() |
| 44 | } |
| 45 | |
| 46 | type revData struct { |
| 47 | Children map[string][]string |
| 48 | Config string |
| 49 | } |
| 50 | |
| 51 | func (pr *PersistedRevision) store() { |
| 52 | if ok, _ := pr.kvStore.Get(pr.Revision.Hash); ok != nil { |
| 53 | return |
| 54 | } |
| 55 | |
| 56 | pr.storeConfig() |
| 57 | |
| 58 | childrenHashes := make(map[string][]string) |
| 59 | for fieldName, children := range pr.Children { |
| 60 | hashes := []string{} |
| 61 | for _, rev := range children { |
| 62 | hashes = append(hashes, rev.Hash) |
| 63 | } |
| 64 | childrenHashes[fieldName] = hashes |
| 65 | } |
| 66 | data := &revData{ |
| 67 | Children: childrenHashes, |
| 68 | Config: pr.Config.Hash, |
| 69 | } |
| 70 | if blob, err := json.Marshal(data); err != nil { |
| 71 | // TODO report error |
| 72 | } else { |
| 73 | if pr.Compress { |
| 74 | var b bytes.Buffer |
| 75 | w := gzip.NewWriter(&b) |
| 76 | w.Write(blob) |
| 77 | w.Close() |
| 78 | blob = b.Bytes() |
| 79 | } |
| 80 | pr.kvStore.Put(pr.Hash, blob) |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | func (pr *PersistedRevision) load(branch *Branch, kvStore *Backend, msgClass interface{}, hash string) *PersistedRevision { |
| 85 | blob, _ := kvStore.Get(hash) |
| 86 | output := blob.Value.([]byte) |
| 87 | var data revData |
| 88 | if pr.Compress { |
| 89 | b := bytes.NewBuffer(blob.Value.([]byte)) |
| 90 | if r, err := gzip.NewReader(b); err != nil { |
| 91 | // TODO : report error |
| 92 | } else { |
| 93 | if output, err = ioutil.ReadAll(r); err != nil { |
| 94 | // TODO report error |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | if err := json.Unmarshal(output, &data); err != nil { |
| 99 | fmt.Errorf("problem to unmarshal data - %s", err.Error()) |
| 100 | } |
| 101 | |
| 102 | configHash := data.Config |
| 103 | configData := pr.loadConfig(kvStore, msgClass, configHash) |
| 104 | assembledChildren := make(map[string][]*Revision) |
| 105 | |
| 106 | childrenHashes := data.Children |
| 107 | node := branch.node |
| 108 | for fieldName, child := range ChildrenFields(msgClass) { |
| 109 | var children []*Revision |
| 110 | for _, childHash := range childrenHashes[fieldName] { |
| 111 | //fmt.Printf("child class type: %+v", reflect.New(n).Elem().Interface()) |
| 112 | childNode := node.makeNode(reflect.New(child.ClassType).Elem().Interface(), "") |
| 113 | childNode.LoadLatest(kvStore, childHash) |
| 114 | childRev := childNode.Latest() |
| 115 | children = append(children, childRev) |
| 116 | } |
| 117 | assembledChildren[fieldName] = children |
| 118 | } |
| 119 | rev := NewPersistedRevision(branch, configData, assembledChildren) |
| 120 | return rev |
| 121 | } |
| 122 | |
| 123 | func (pr *PersistedRevision) storeConfig() { |
| 124 | if ok, _ := pr.kvStore.Get(pr.Config.Hash); ok != nil { |
| 125 | return |
| 126 | } |
| 127 | if blob, err := proto.Marshal(pr.Config.Data.(proto.Message)); err != nil { |
| 128 | // TODO report error |
| 129 | } else { |
| 130 | if pr.Compress { |
| 131 | var b bytes.Buffer |
| 132 | w := gzip.NewWriter(&b) |
| 133 | w.Write(blob) |
| 134 | w.Close() |
| 135 | blob = b.Bytes() |
| 136 | } |
| 137 | pr.kvStore.Put(pr.Config.Hash, blob) |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | func (pr *PersistedRevision) loadConfig(kvStore *Backend, msgClass interface{}, hash string) interface{} { |
| 142 | blob, _ := kvStore.Get(hash) |
| 143 | output := blob.Value.([]byte) |
| 144 | |
| 145 | if pr.Compress { |
| 146 | b := bytes.NewBuffer(blob.Value.([]byte)) |
| 147 | if r, err := gzip.NewReader(b); err != nil { |
| 148 | // TODO : report error |
| 149 | } else { |
| 150 | if output, err = ioutil.ReadAll(r); err != nil { |
| 151 | // TODO report error |
| 152 | } |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | var data reflect.Value |
| 157 | if msgClass != nil { |
| 158 | data = reflect.New(reflect.TypeOf(msgClass).Elem()) |
| 159 | if err := proto.Unmarshal(output, data.Interface().(proto.Message)); err != nil { |
| 160 | // TODO report error |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | return data.Interface() |
| 165 | } |