driver

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Published: May 6, 2015 License: Apache-2.0 Imports: 7 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

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var ErrUnsupportedMethod = errors.New("unsupported method")

ErrUnsupportedMethod may be returned in the case where a StorageDriver implementation does not support an optional method.

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var PathRegexp = regexp.MustCompile(`^(/[A-Za-z0-9._-]+)+$`)

PathRegexp is the regular expression which each file path must match. A file path is absolute, beginning with a slash and containing a positive number of path components separated by slashes, where each component is restricted to lowercase alphanumeric characters or a period, underscore, or hyphen.

Functions

This section is empty.

Types

type FileInfo

type FileInfo interface {
	// Path provides the full path of the target of this file info.
	Path() string

	// Size returns current length in bytes of the file. The return value can
	// be used to write to the end of the file at path. The value is
	// meaningless if IsDir returns true.
	Size() int64

	// ModTime returns the modification time for the file. For backends that
	// don't have a modification time, the creation time should be returned.
	ModTime() time.Time

	// IsDir returns true if the path is a directory.
	IsDir() bool
}

FileInfo returns information about a given path. Inspired by os.FileInfo, it elides the base name method for a full path instead.

type FileInfoFields

type FileInfoFields struct {
	// Path provides the full path of the target of this file info.
	Path string

	// Size is current length in bytes of the file. The value of this field
	// can be used to write to the end of the file at path. The value is
	// meaningless if IsDir is set to true.
	Size int64

	// ModTime returns the modification time for the file. For backends that
	// don't have a modification time, the creation time should be returned.
	ModTime time.Time

	// IsDir returns true if the path is a directory.
	IsDir bool
}

FileInfoFields provides the exported fields for implementing FileInfo interface in storagedriver implementations. It should be used with InternalFileInfo.

type FileInfoInternal

type FileInfoInternal struct {
	FileInfoFields
}

FileInfoInternal implements the FileInfo interface. This should only be used by storagedriver implementations that don't have a specialized FileInfo type.

func (FileInfoInternal) IsDir

func (fi FileInfoInternal) IsDir() bool

IsDir returns true if the path is a directory.

func (FileInfoInternal) ModTime

func (fi FileInfoInternal) ModTime() time.Time

ModTime returns the modification time for the file. For backends that don't have a modification time, the creation time should be returned.

func (FileInfoInternal) Path

func (fi FileInfoInternal) Path() string

Path provides the full path of the target of this file info.

func (FileInfoInternal) Size

func (fi FileInfoInternal) Size() int64

Size returns current length in bytes of the file. The return value can be used to write to the end of the file at path. The value is meaningless if IsDir returns true.

type InvalidOffsetError

type InvalidOffsetError struct {
	Path   string
	Offset int64
}

InvalidOffsetError is returned when attempting to read or write from an invalid offset.

func (InvalidOffsetError) Error

func (err InvalidOffsetError) Error() string

type InvalidPathError

type InvalidPathError struct {
	Path string
}

InvalidPathError is returned when the provided path is malformed.

func (InvalidPathError) Error

func (err InvalidPathError) Error() string

type PathNotFoundError

type PathNotFoundError struct {
	Path string
}

PathNotFoundError is returned when operating on a nonexistent path.

func (PathNotFoundError) Error

func (err PathNotFoundError) Error() string

type StorageDriver

type StorageDriver interface {
	// Name returns the human-readable "name" of the driver, useful in error
	// messages and logging. By convention, this will just be the registration
	// name, but drivers may provide other information here.
	Name() string

	// GetContent retrieves the content stored at "path" as a []byte.
	// This should primarily be used for small objects.
	GetContent(path string) ([]byte, error)

	// PutContent stores the []byte content at a location designated by "path".
	// This should primarily be used for small objects.
	PutContent(path string, content []byte) error

	// ReadStream retrieves an io.ReadCloser for the content stored at "path"
	// with a given byte offset.
	// May be used to resume reading a stream by providing a nonzero offset.
	ReadStream(path string, offset int64) (io.ReadCloser, error)

	// WriteStream stores the contents of the provided io.ReadCloser at a
	// location designated by the given path.
	// May be used to resume writing a stream by providing a nonzero offset.
	// The offset must be no larger than the CurrentSize for this path.
	WriteStream(path string, offset int64, reader io.Reader) (nn int64, err error)

	// Stat retrieves the FileInfo for the given path, including the current
	// size in bytes and the creation time.
	Stat(path string) (FileInfo, error)

	// List returns a list of the objects that are direct descendants of the
	//given path.
	List(path string) ([]string, error)

	// Move moves an object stored at sourcePath to destPath, removing the
	// original object.
	// Note: This may be no more efficient than a copy followed by a delete for
	// many implementations.
	Move(sourcePath string, destPath string) error

	// Delete recursively deletes all objects stored at "path" and its subpaths.
	Delete(path string) error

	// URLFor returns a URL which may be used to retrieve the content stored at
	// the given path, possibly using the given options.
	// May return an ErrUnsupportedMethod in certain StorageDriver
	// implementations.
	URLFor(path string, options map[string]interface{}) (string, error)
}

StorageDriver defines methods that a Storage Driver must implement for a filesystem-like key/value object storage.

type Version

type Version string

Version is a string representing the storage driver version, of the form Major.Minor. The registry must accept storage drivers with equal major version and greater minor version, but may not be compatible with older storage driver versions.

const CurrentVersion Version = "0.1"

CurrentVersion is the current storage driver Version.

func (Version) Major

func (version Version) Major() uint

Major returns the major (primary) component of a version.

func (Version) Minor

func (version Version) Minor() uint

Minor returns the minor (secondary) component of a version.

Directories

Path Synopsis
Package azure provides a storagedriver.StorageDriver implementation to store blobs in Microsoft Azure Blob Storage Service.
Package azure provides a storagedriver.StorageDriver implementation to store blobs in Microsoft Azure Blob Storage Service.
Package base provides a base implementation of the storage driver that can be used to implement common checks.
Package base provides a base implementation of the storage driver that can be used to implement common checks.
cloudfront
Package middleware - cloudfront wrapper for storage libs N.B. currently only works with S3, not arbitrary sites
Package middleware - cloudfront wrapper for storage libs N.B. currently only works with S3, not arbitrary sites
Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage.
Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage.

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