package store import ( "context" "path/filepath" "sort" "strings" "time" "github.com/patrickmn/go-cache" ) // NewStore returns a memory store func NewStore(opts ...Option) Store { return &memoryStore{ opts: NewOptions(opts...), store: cache.New(cache.NoExpiration, 5*time.Minute), } } func (m *memoryStore) Connect(ctx context.Context) error { return nil } func (m *memoryStore) Disconnect(ctx context.Context) error { m.store.Flush() return nil } type memoryStore struct { store *cache.Cache opts Options } func (m *memoryStore) key(prefix, key string) string { return filepath.Join(prefix, key) } func (m *memoryStore) prefix(database, table string) string { if len(database) == 0 { database = m.opts.Database } if len(table) == 0 { table = m.opts.Table } return filepath.Join(database, table) } func (m *memoryStore) exists(prefix, key string) error { key = m.key(prefix, key) _, found := m.store.Get(key) if !found { return ErrNotFound } return nil } func (m *memoryStore) get(prefix, key string, val interface{}) error { key = m.key(prefix, key) r, found := m.store.Get(key) if !found { return ErrNotFound } buf, ok := r.([]byte) if !ok { return ErrNotFound } return m.opts.Codec.Unmarshal(buf, val) } func (m *memoryStore) delete(prefix, key string) { key = m.key(prefix, key) m.store.Delete(key) } func (m *memoryStore) list(prefix string, limit, offset uint) []string { allItems := m.store.Items() allKeys := make([]string, len(allItems)) i := 0 for k := range allItems { if !strings.HasPrefix(k, prefix+"/") { continue } allKeys[i] = strings.TrimPrefix(k, prefix+"/") i++ } if limit != 0 || offset != 0 { sort.Slice(allKeys, func(i, j int) bool { return allKeys[i] < allKeys[j] }) sort.Slice(allKeys, func(i, j int) bool { return allKeys[i] < allKeys[j] }) end := len(allKeys) if limit > 0 { calcLimit := int(offset + limit) if calcLimit < end { end = calcLimit } } if int(offset) >= end { return nil } return allKeys[offset:end] } return allKeys } func (m *memoryStore) Init(opts ...Option) error { for _, o := range opts { o(&m.opts) } return nil } func (m *memoryStore) String() string { return "memory" } func (m *memoryStore) Name() string { return m.opts.Name } func (m *memoryStore) Exists(ctx context.Context, key string, opts ...ExistsOption) error { prefix := m.prefix(m.opts.Database, m.opts.Table) return m.exists(prefix, key) } func (m *memoryStore) Read(ctx context.Context, key string, val interface{}, opts ...ReadOption) error { readOpts := NewReadOptions(opts...) prefix := m.prefix(readOpts.Database, readOpts.Table) return m.get(prefix, key, val) } func (m *memoryStore) Write(ctx context.Context, key string, val interface{}, opts ...WriteOption) error { writeOpts := NewWriteOptions(opts...) prefix := m.prefix(writeOpts.Database, writeOpts.Table) key = m.key(prefix, key) buf, err := m.opts.Codec.Marshal(val) if err != nil { return err } m.store.Set(key, buf, writeOpts.TTL) return nil } func (m *memoryStore) Delete(ctx context.Context, key string, opts ...DeleteOption) error { deleteOptions := NewDeleteOptions(opts...) prefix := m.prefix(deleteOptions.Database, deleteOptions.Table) m.delete(prefix, key) return nil } func (m *memoryStore) Options() Options { return m.opts } func (m *memoryStore) List(ctx context.Context, opts ...ListOption) ([]string, error) { listOptions := NewListOptions(opts...) prefix := m.prefix(listOptions.Database, listOptions.Table) keys := m.list(prefix, listOptions.Limit, listOptions.Offset) if len(listOptions.Prefix) > 0 { var prefixKeys []string for _, k := range keys { if strings.HasPrefix(k, listOptions.Prefix) { prefixKeys = append(prefixKeys, k) } } keys = prefixKeys } if len(listOptions.Suffix) > 0 { var suffixKeys []string for _, k := range keys { if strings.HasSuffix(k, listOptions.Suffix) { suffixKeys = append(suffixKeys, k) } } keys = suffixKeys } return keys, nil }