Golang storage.Get函数代码示例

func (s *filestorageSuite) TestGetRefusesTemp(c *gc.C) {
	s.createFile(c, ".tmp/test-file")
	_, err := storage.Get(s.reader, ".tmp/test-file")
	c.Check(err, gc.NotNil)
	c.Check(err, jc.Satisfies, os.IsNotExist)
	s.createFile(c, ".tmp/foo/test-file")
	_, err = storage.Get(s.reader, ".tmp/foo/test-file")
	c.Check(err, gc.NotNil)
	c.Check(err, jc.Satisfies, os.IsNotExist)
}

func (s *storageSuite) TestGet(c *gc.C) {
	stor, storageDir := s.makeStorage(c)
	data := []byte("abc\000def")
	err := os.Mkdir(filepath.Join(storageDir, "a"), 0755)
	c.Assert(err, gc.IsNil)
	for _, name := range []string{"b", filepath.Join("a", "b")} {
		err = ioutil.WriteFile(filepath.Join(storageDir, name), data, 0644)
		c.Assert(err, gc.IsNil)
		r, err := storage.Get(stor, name)
		c.Assert(err, gc.IsNil)
		out, err := ioutil.ReadAll(r)
		c.Assert(err, gc.IsNil)
		c.Assert(out, gc.DeepEquals, data)
	}
	_, err = storage.Get(stor, "notthere")
	c.Assert(err, jc.Satisfies, errors.IsNotFound)
}

func (*storageSuite) TestGetReturnsNotFoundIf404(c *gc.C) {
	container := "container"
	filename := "blobname"
	response := makeResponse("not found", http.StatusNotFound)
	azStorage, transport := makeFakeStorage(container, "account", "")
	transport.AddExchange(response, nil)
	_, err := storage.Get(azStorage, filename)
	c.Assert(err, gc.NotNil)
	c.Check(err, jc.Satisfies, errors.IsNotFound)
}

// LoadState reads state from the given storage.
func LoadState(stor storage.StorageReader) (*BootstrapState, error) {
	r, err := storage.Get(stor, StateFile)
	if err != nil {
		if errors.IsNotFound(err) {
			return nil, environs.ErrNotBootstrapped
		}
		return nil, err
	}
	return loadState(r)
}

// fetchToolsHash fetches the tools from storage and calculates
// its size in bytes and computes a SHA256 hash of its contents.
func fetchToolsHash(stor storage.StorageReader, ver version.Binary) (size int64, sha256hash hash.Hash, err error) {
	r, err := storage.Get(stor, StorageName(ver))
	if err != nil {
		return 0, nil, err
	}
	defer r.Close()
	sha256hash = sha256.New()
	size, err = io.Copy(sha256hash, r)
	return size, sha256hash, err
}

func (s *localServerSuite) TestRemoveAll(c *gc.C) {
	env := s.Prepare(c)
	stor := env.Storage()
	for _, a := range []byte("abcdefghijklmnopqrstuvwxyz") {
		content := []byte{a}
		name := string(content)
		err := stor.Put(name, bytes.NewBuffer(content),
			int64(len(content)))
		c.Assert(err, gc.IsNil)
	}
	reader, err := storage.Get(stor, "a")
	c.Assert(err, gc.IsNil)
	allContent, err := ioutil.ReadAll(reader)
	c.Assert(err, gc.IsNil)
	c.Assert(string(allContent), gc.Equals, "a")
	err = stor.RemoveAll()
	c.Assert(err, gc.IsNil)
	_, err = storage.Get(stor, "a")
	c.Assert(err, gc.NotNil)
}

func assertMirrors(c *gc.C, stor storage.StorageReader, expectMirrors bool) {
	r, err := storage.Get(stor, "tools/"+simplestreams.UnsignedMirror)
	if err == nil {
		defer r.Close()
	}
	if expectMirrors {
		data, err := ioutil.ReadAll(r)
		c.Assert(err, gc.IsNil)
		c.Assert(string(data), jc.Contains, `"mirrors":`)
	} else {
		c.Assert(err, gc.NotNil)
	}
}

func (t *LiveTests) TestBootstrapVerifyStorage(c *gc.C) {
	// Bootstrap automatically verifies that storage is writable.
	t.BootstrapOnce(c)
	environ := t.Env
	stor := environ.Storage()
	reader, err := storage.Get(stor, "bootstrap-verify")
	c.Assert(err, gc.IsNil)
	defer reader.Close()
	contents, err := ioutil.ReadAll(reader)
	c.Assert(err, gc.IsNil)
	c.Check(string(contents), gc.Equals,
		"juju-core storage writing verified: ok\n")
}

func storageCopy(source storage.Storage, sourcePath string, target storage.Storage, targetPath string) error {
	rc, err := storage.Get(source, sourcePath)
	if err != nil {
		return err
	}
	var buf bytes.Buffer
	_, err = io.Copy(&buf, rc)
	rc.Close()
	if err != nil {
		return err
	}
	return target.Put(targetPath, &buf, int64(buf.Len()))
}

func (s *localServerSuite) TestDeleteMoreThan100(c *gc.C) {
	env := s.Prepare(c).(environs.EnvironStorage)
	stor := env.Storage()
	// 6*26 = 156 items
	for _, a := range []byte("abcdef") {
		for _, b := range []byte("abcdefghijklmnopqrstuvwxyz") {
			content := []byte{a, b}
			name := string(content)
			err := stor.Put(name, bytes.NewBuffer(content),
				int64(len(content)))
			c.Assert(err, jc.ErrorIsNil)
		}
	}
	reader, err := storage.Get(stor, "ab")
	c.Assert(err, jc.ErrorIsNil)
	allContent, err := ioutil.ReadAll(reader)
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(string(allContent), gc.Equals, "ab")
	err = stor.RemoveAll()
	c.Assert(err, jc.ErrorIsNil)
	_, err = storage.Get(stor, "ab")
	c.Assert(err, gc.NotNil)
}

func (s *storageSuite) TestFileContentsAreBinary(c *gc.C) {
	const filename = "myfile.bin"
	data := []byte{0, 1, 255, 2, 254, 3}
	stor := s.makeStorage("binary-test")

	err := stor.Put(filename, bytes.NewReader(data), int64(len(data)))
	c.Assert(err, gc.IsNil)
	file, err := storage.Get(stor, filename)
	c.Assert(err, gc.IsNil)
	content, err := ioutil.ReadAll(file)
	c.Assert(err, gc.IsNil)

	c.Check(content, gc.DeepEquals, data)
}

func (s *verifyStorageSuite) TestVerifyStorage(c *gc.C) {
	ctx := testing.Context(c)
	environ, err := environs.PrepareFromName("test", ctx, configstore.NewMem())
	c.Assert(err, gc.IsNil)
	stor := environ.Storage()
	err = environs.VerifyStorage(stor)
	c.Assert(err, gc.IsNil)
	reader, err := storage.Get(stor, environs.VerificationFilename)
	c.Assert(err, gc.IsNil)
	defer reader.Close()
	contents, err := ioutil.ReadAll(reader)
	c.Assert(err, gc.IsNil)
	c.Check(string(contents), gc.Equals,
		"juju-core storage writing verified: ok\n")
}

func (s *storageSuite) TestWithExclusiveLocks(c *gc.C) {
	stor, storageDir := s.makeStorage(c)
	// None of the methods (apart from URL) should be able to do anything
	// while an exclusive lock is held.
	s.flock(c, flockExclusive, storageDir)
	_, err := stor.URL("a")
	c.Assert(err, gc.IsNil)
	c.Assert(stor.Put("a", bytes.NewBuffer(nil), 0), gc.NotNil)
	c.Assert(stor.Remove("a"), gc.NotNil)
	c.Assert(stor.RemoveAll(), gc.NotNil)
	_, err = storage.Get(stor, "a")
	c.Assert(err, gc.NotNil)
	_, err = storage.List(stor, "")
	c.Assert(err, gc.NotNil)
}

func (s *storageSuite) TestRemoveDeletesFile(c *gc.C) {
	const filename = "doomed.txt"
	stor := NewStorage(s.makeEnviron())
	s.fakeStoredFile(stor, filename)

	err := stor.Remove(filename)
	c.Assert(err, gc.IsNil)

	_, err = storage.Get(stor, filename)
	c.Assert(err, jc.Satisfies, errors.IsNotFound)

	listing, err := storage.List(stor, filename)
	c.Assert(err, gc.IsNil)
	c.Assert(listing, gc.DeepEquals, []string{})
}

func (s *storageSuite) TestWithSharedLocks(c *gc.C) {
	stor, storageDir := s.makeStorage(c)

	// Get and List should be able to proceed with a shared lock.
	// All other methods should fail.
	createFiles(c, storageDir, "a")

	s.flock(c, flockShared, storageDir)
	_, err := storage.Get(stor, "a")
	c.Assert(err, gc.IsNil)
	_, err = storage.List(stor, "")
	c.Assert(err, gc.IsNil)
	c.Assert(stor.Put("a", bytes.NewBuffer(nil), 0), gc.NotNil)
	c.Assert(stor.Remove("a"), gc.NotNil)
	c.Assert(stor.RemoveAll(), gc.NotNil)
}