mirror of
https://github.com/restic/restic.git
synced 2024-08-25 13:47:22 +02:00
214 lines
4.1 KiB
Go
214 lines
4.1 KiB
Go
package mem
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import (
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"bytes"
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"context"
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"io"
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"io/ioutil"
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"sync"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/debug"
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)
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type memMap map[restic.Handle][]byte
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// make sure that MemoryBackend implements backend.Backend
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var _ restic.Backend = &MemoryBackend{}
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var errNotFound = errors.New("not found")
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// MemoryBackend is a mock backend that uses a map for storing all data in
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// memory. This should only be used for tests.
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type MemoryBackend struct {
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data memMap
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m sync.Mutex
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}
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// New returns a new backend that saves all data in a map in memory.
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func New() *MemoryBackend {
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be := &MemoryBackend{
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data: make(memMap),
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}
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debug.Log("created new memory backend")
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return be
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}
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// Test returns whether a file exists.
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func (be *MemoryBackend) Test(ctx context.Context, h restic.Handle) (bool, error) {
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be.m.Lock()
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defer be.m.Unlock()
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debug.Log("Test %v", h)
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if _, ok := be.data[h]; ok {
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return true, nil
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}
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return false, nil
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}
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// IsNotExist returns true if the file does not exist.
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func (be *MemoryBackend) IsNotExist(err error) bool {
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return errors.Cause(err) == errNotFound
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}
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// Save adds new Data to the backend.
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func (be *MemoryBackend) Save(ctx context.Context, h restic.Handle, rd io.Reader) error {
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if err := h.Valid(); err != nil {
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return err
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}
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be.m.Lock()
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defer be.m.Unlock()
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if h.Type == restic.ConfigFile {
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h.Name = ""
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}
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if _, ok := be.data[h]; ok {
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return errors.New("file already exists")
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}
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buf, err := ioutil.ReadAll(rd)
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if err != nil {
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return err
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}
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be.data[h] = buf
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debug.Log("saved %v bytes at %v", len(buf), h)
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return nil
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}
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// Load returns a reader that yields the contents of the file at h at the
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// given offset. If length is nonzero, only a portion of the file is
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// returned. rd must be closed after use.
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func (be *MemoryBackend) Load(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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if err := h.Valid(); err != nil {
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return nil, err
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}
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be.m.Lock()
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defer be.m.Unlock()
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if h.Type == restic.ConfigFile {
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h.Name = ""
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}
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debug.Log("Load %v offset %v len %v", h, offset, length)
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if offset < 0 {
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return nil, errors.New("offset is negative")
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}
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if _, ok := be.data[h]; !ok {
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return nil, errNotFound
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}
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buf := be.data[h]
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if offset > int64(len(buf)) {
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return nil, errors.New("offset beyond end of file")
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}
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buf = buf[offset:]
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if length > 0 && len(buf) > length {
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buf = buf[:length]
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}
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return ioutil.NopCloser(bytes.NewReader(buf)), nil
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}
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// Stat returns information about a file in the backend.
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func (be *MemoryBackend) Stat(ctx context.Context, h restic.Handle) (restic.FileInfo, error) {
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be.m.Lock()
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defer be.m.Unlock()
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if err := h.Valid(); err != nil {
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return restic.FileInfo{}, err
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}
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if h.Type == restic.ConfigFile {
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h.Name = ""
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}
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debug.Log("stat %v", h)
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e, ok := be.data[h]
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if !ok {
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return restic.FileInfo{}, errNotFound
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}
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return restic.FileInfo{Size: int64(len(e))}, nil
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}
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// Remove deletes a file from the backend.
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func (be *MemoryBackend) Remove(ctx context.Context, h restic.Handle) error {
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be.m.Lock()
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defer be.m.Unlock()
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debug.Log("Remove %v", h)
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if _, ok := be.data[h]; !ok {
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return errNotFound
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}
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delete(be.data, h)
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return nil
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}
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// List returns a channel which yields entries from the backend.
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func (be *MemoryBackend) List(ctx context.Context, t restic.FileType) <-chan string {
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be.m.Lock()
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defer be.m.Unlock()
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ch := make(chan string)
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var ids []string
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for entry := range be.data {
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if entry.Type != t {
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continue
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}
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ids = append(ids, entry.Name)
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}
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debug.Log("list %v: %v", t, ids)
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go func() {
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defer close(ch)
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for _, id := range ids {
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select {
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case ch <- id:
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case <-ctx.Done():
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return
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}
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}
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}()
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return ch
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}
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// Location returns the location of the backend (RAM).
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func (be *MemoryBackend) Location() string {
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return "RAM"
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}
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// Delete removes all data in the backend.
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func (be *MemoryBackend) Delete(ctx context.Context) error {
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be.m.Lock()
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defer be.m.Unlock()
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be.data = make(memMap)
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return nil
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}
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// Close closes the backend.
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func (be *MemoryBackend) Close() error {
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return nil
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}
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