|
| 1 | +package store |
| 2 | + |
| 3 | +import ( |
| 4 | + "path/filepath" |
| 5 | + "sync" |
| 6 | + "time" |
| 7 | + |
| 8 | + "github.com/dgraph-io/badger/v3" |
| 9 | + "github.com/sirupsen/logrus" |
| 10 | +) |
| 11 | + |
| 12 | +type BadgerStore struct { |
| 13 | + db *badger.DB |
| 14 | + gcExitCh chan struct{} |
| 15 | + wg sync.WaitGroup |
| 16 | +} |
| 17 | + |
| 18 | +func logrusLevelToBadgerLevel(options badger.Options) badger.Options { |
| 19 | + switch logrus.GetLevel() { |
| 20 | + case logrus.InfoLevel: |
| 21 | + return options.WithLoggingLevel(badger.INFO) |
| 22 | + case logrus.TraceLevel: |
| 23 | + fallthrough |
| 24 | + case logrus.DebugLevel: |
| 25 | + return options.WithLoggingLevel(badger.DEBUG) |
| 26 | + case logrus.WarnLevel: |
| 27 | + return options.WithLoggingLevel(badger.WARNING) |
| 28 | + case logrus.FatalLevel: |
| 29 | + fallthrough |
| 30 | + case logrus.PanicLevel: |
| 31 | + fallthrough |
| 32 | + case logrus.ErrorLevel: |
| 33 | + return options.WithLoggingLevel(badger.ERROR) |
| 34 | + default: |
| 35 | + return options.WithLoggingLevel(badger.ERROR) |
| 36 | + } |
| 37 | +} |
| 38 | + |
| 39 | +func NewBadgerStore(path string, userID string, encryptionPassphrase []byte) (*BadgerStore, error) { |
| 40 | + directory := filepath.Join(path, userID) |
| 41 | + db, err := badger.Open(logrusLevelToBadgerLevel(badger.DefaultOptions(directory)). |
| 42 | + WithLogger(logrus.StandardLogger()). |
| 43 | + WithEncryptionKey(encryptionPassphrase). |
| 44 | + WithIndexCacheSize(128 * 1024 * 1024)) |
| 45 | + |
| 46 | + if err != nil { |
| 47 | + return nil, nil |
| 48 | + } |
| 49 | + |
| 50 | + store := &BadgerStore{db: db, gcExitCh: make(chan struct{})} |
| 51 | + |
| 52 | + store.startGCCollector() |
| 53 | + |
| 54 | + return store, nil |
| 55 | +} |
| 56 | + |
| 57 | +func (b *BadgerStore) startGCCollector() { |
| 58 | + // Garbage collection needs to be run manually by us at some point. |
| 59 | + // See https://dgraph.io/docs/badger/get-started/#garbage-collection for more details. |
| 60 | + b.wg.Add(1) |
| 61 | + |
| 62 | + go func() { |
| 63 | + defer b.wg.Done() |
| 64 | + |
| 65 | + gcRun := time.After(5 * time.Minute) |
| 66 | + |
| 67 | + select { |
| 68 | + case <-gcRun: |
| 69 | + { |
| 70 | + again: |
| 71 | + err := b.db.RunValueLogGC(0.7) |
| 72 | + if err == nil { |
| 73 | + goto again |
| 74 | + } |
| 75 | + } |
| 76 | + case <-b.gcExitCh: |
| 77 | + return |
| 78 | + } |
| 79 | + }() |
| 80 | +} |
| 81 | + |
| 82 | +func (b *BadgerStore) Get(messageID string) ([]byte, error) { |
| 83 | + var data []byte |
| 84 | + |
| 85 | + if err := b.db.View(func(txn *badger.Txn) error { |
| 86 | + item, err := txn.Get([]byte(messageID)) |
| 87 | + if err != nil { |
| 88 | + return err |
| 89 | + } |
| 90 | + |
| 91 | + data, err = item.ValueCopy(nil) |
| 92 | + if err != nil { |
| 93 | + return err |
| 94 | + } |
| 95 | + |
| 96 | + return nil |
| 97 | + }); err != nil { |
| 98 | + return nil, err |
| 99 | + } |
| 100 | + |
| 101 | + return data, nil |
| 102 | +} |
| 103 | + |
| 104 | +func (b *BadgerStore) Set(messageID string, literal []byte) error { |
| 105 | + return b.db.Update(func(txn *badger.Txn) error { |
| 106 | + return txn.Set([]byte(messageID), literal) |
| 107 | + }) |
| 108 | +} |
| 109 | + |
| 110 | +func (b *BadgerStore) Update(oldID, newID string) error { |
| 111 | + return b.db.Update(func(txn *badger.Txn) error { |
| 112 | + oldIDBytes := []byte(oldID) |
| 113 | + newIDBytes := []byte(newID) |
| 114 | + |
| 115 | + item, err := txn.Get(oldIDBytes) |
| 116 | + if err != nil { |
| 117 | + return err |
| 118 | + } |
| 119 | + |
| 120 | + buffer := make([]byte, item.ValueSize()) |
| 121 | + buffer, err = item.ValueCopy(buffer) |
| 122 | + if err != nil { |
| 123 | + return err |
| 124 | + } |
| 125 | + |
| 126 | + if err := txn.Set(newIDBytes, buffer); err != nil { |
| 127 | + return err |
| 128 | + } |
| 129 | + |
| 130 | + return txn.Delete(oldIDBytes) |
| 131 | + }) |
| 132 | +} |
| 133 | + |
| 134 | +func (b *BadgerStore) Delete(messageID ...string) error { |
| 135 | + return b.db.Update(func(txn *badger.Txn) error { |
| 136 | + for _, v := range messageID { |
| 137 | + if err := txn.Delete([]byte(v)); err != nil { |
| 138 | + return err |
| 139 | + } |
| 140 | + } |
| 141 | + |
| 142 | + return nil |
| 143 | + }) |
| 144 | +} |
| 145 | + |
| 146 | +func (b *BadgerStore) Close() error { |
| 147 | + close(b.gcExitCh) |
| 148 | + b.wg.Wait() |
| 149 | + |
| 150 | + return b.db.Close() |
| 151 | +} |
| 152 | + |
| 153 | +type BadgerStoreBuilder struct{} |
| 154 | + |
| 155 | +func (*BadgerStoreBuilder) New(directory, userID, encryptionPassphrase string) (Store, error) { |
| 156 | + return NewBadgerStore(directory, userID, []byte(encryptionPassphrase)) |
| 157 | +} |
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