95 lines
3.2 KiB
Go
95 lines
3.2 KiB
Go
package storagedriver
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import (
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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// Version is a string representing the storage driver version, of the form
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// Major.Minor.
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// The registry must accept storage drivers with equal major version and greater
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// minor version, but may not be compatible with older storage driver versions.
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type Version string
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// Major returns the major (primary) component of a version.
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func (version Version) Major() uint {
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majorPart := strings.Split(string(version), ".")[0]
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major, _ := strconv.ParseUint(majorPart, 10, 0)
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return uint(major)
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}
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// Minor returns the minor (secondary) component of a version.
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func (version Version) Minor() uint {
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minorPart := strings.Split(string(version), ".")[1]
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minor, _ := strconv.ParseUint(minorPart, 10, 0)
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return uint(minor)
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}
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// CurrentVersion is the current storage driver Version.
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const CurrentVersion Version = "0.1"
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// StorageDriver defines methods that a Storage Driver must implement for a
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// filesystem-like key/value object storage.
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type StorageDriver interface {
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// GetContent retrieves the content stored at "path" as a []byte.
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// This should primarily be used for small objects.
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GetContent(path string) ([]byte, error)
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// PutContent stores the []byte content at a location designated by "path".
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// This should primarily be used for small objects.
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PutContent(path string, content []byte) error
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// ReadStream retrieves an io.ReadCloser for the content stored at "path"
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// with a given byte offset.
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// May be used to resume reading a stream by providing a nonzero offset.
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ReadStream(path string, offset uint64) (io.ReadCloser, error)
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// WriteStream stores the contents of the provided io.ReadCloser at a
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// location designated by the given path.
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// The driver will know it has received the full contents when it has read
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// "size" bytes.
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// May be used to resume writing a stream by providing a nonzero offset.
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// The offset must be no larger than the CurrentSize for this path.
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WriteStream(path string, offset, size uint64, readCloser io.ReadCloser) error
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// CurrentSize retrieves the curernt size in bytes of the object at the
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// given path.
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// It should be safe to read or write anywhere up to this point.
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CurrentSize(path string) (uint64, error)
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// List returns a list of the objects that are direct descendants of the
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//given path.
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List(path string) ([]string, error)
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// Move moves an object stored at sourcePath to destPath, removing the
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// original object.
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// Note: This may be no more efficient than a copy followed by a delete for
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// many implementations.
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Move(sourcePath string, destPath string) error
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// Delete recursively deletes all objects stored at "path" and its subpaths.
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Delete(path string) error
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}
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// PathNotFoundError is returned when operating on a nonexistent path.
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type PathNotFoundError struct {
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Path string
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}
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func (err PathNotFoundError) Error() string {
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return fmt.Sprintf("Path not found: %s", err.Path)
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}
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// InvalidOffsetError is returned when attempting to read or write from an
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// invalid offset.
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type InvalidOffsetError struct {
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Path string
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Offset uint64
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}
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func (err InvalidOffsetError) Error() string {
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return fmt.Sprintf("Invalid offset: %d for path: %s", err.Offset, err.Path)
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}
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