71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
package testdriver
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import (
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"github.com/docker/distribution/context"
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storagedriver "github.com/docker/distribution/registry/storage/driver"
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"github.com/docker/distribution/registry/storage/driver/factory"
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"github.com/docker/distribution/registry/storage/driver/inmemory"
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)
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const driverName = "testdriver"
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func init() {
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factory.Register(driverName, &testDriverFactory{})
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}
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// testDriverFactory implements the factory.StorageDriverFactory interface.
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type testDriverFactory struct{}
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func (factory *testDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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return New(), nil
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}
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// TestDriver is a StorageDriver for testing purposes. The Writer returned by this driver
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// simulates the case where Write operations are buffered. This causes the value returned by Size to lag
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// behind until Close (or Commit, or Cancel) is called.
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type TestDriver struct {
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storagedriver.StorageDriver
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}
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type testFileWriter struct {
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storagedriver.FileWriter
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prevchunk []byte
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}
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var _ storagedriver.StorageDriver = &TestDriver{}
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// New constructs a new StorageDriver for testing purposes. The Writer returned by this driver
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// simulates the case where Write operations are buffered. This causes the value returned by Size to lag
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// behind until Close (or Commit, or Cancel) is called.
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func New() *TestDriver {
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return &TestDriver{StorageDriver: inmemory.New()}
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}
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// Writer returns a FileWriter which will store the content written to it
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// at the location designated by "path" after the call to Commit.
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func (td *TestDriver) Writer(ctx context.Context, path string, append bool) (storagedriver.FileWriter, error) {
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fw, err := td.StorageDriver.Writer(ctx, path, append)
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return &testFileWriter{FileWriter: fw}, err
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}
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func (tfw *testFileWriter) Write(p []byte) (int, error) {
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_, err := tfw.FileWriter.Write(tfw.prevchunk)
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tfw.prevchunk = make([]byte, len(p))
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copy(tfw.prevchunk, p)
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return len(p), err
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}
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func (tfw *testFileWriter) Close() error {
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tfw.Write(nil)
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return tfw.FileWriter.Close()
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}
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func (tfw *testFileWriter) Cancel() error {
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tfw.Write(nil)
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return tfw.FileWriter.Cancel()
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}
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func (tfw *testFileWriter) Commit() error {
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tfw.Write(nil)
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return tfw.FileWriter.Commit()
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}
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