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Restructure backend

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This commit is contained in:
Alexander Neumann 2014-12-21 15:57:41 +01:00
parent 0e1045301a
commit 661c1e9aa1
6 changed files with 95 additions and 28 deletions
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16
backend/generic.go
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@ -8,15 +8,12 @@ import (
"errors"
"io/ioutil"
"sort"
"sync"
)
const (
MinPrefixLength = 4
)
var idPool = sync.Pool{New: func() interface{} { return ID(make([]byte, IDSize)) }}
var (
ErrNoIDPrefixFound = errors.New("no ID found")
ErrMultipleIDMatches = errors.New("multiple IDs with prefix found")
@ -24,7 +21,10 @@ var (
// Each lists all entries of type t in the backend and calls function f() with
// the id and data.
func Each(be Server, t Type, f func(id ID, data []byte, err error)) error {
func Each(be interface {
lister
getter
}, t Type, f func(id ID, data []byte, err error)) error {
ids, err := be.List(t)
if err != nil {
return err
@ -45,7 +45,7 @@ func Each(be Server, t Type, f func(id ID, data []byte, err error)) error {
// Each lists all entries of type t in the backend and calls function f() with
// the id.
func EachID(be Server, t Type, f func(ID)) error {
func EachID(be lister, t Type, f func(ID)) error {
ids, err := be.List(t)
if err != nil {
return err
@ -101,7 +101,7 @@ func Hash(data []byte) ID {
// Find loads the list of all blobs of type t and searches for IDs which start
// with prefix. If none is found, nil and ErrNoIDPrefixFound is returned. If
// more than one is found, nil and ErrMultipleIDMatches is returned.
func Find(be Server, t Type, prefix string) (ID, error) {
func Find(be lister, t Type, prefix string) (ID, error) {
p, err := hex.DecodeString(prefix)
if err != nil {
return nil, err
@ -134,7 +134,7 @@ func Find(be Server, t Type, prefix string) (ID, error) {
// FindSnapshot takes a string and tries to find a snapshot whose ID matches
// the string as closely as possible.
func FindSnapshot(be Server, s string) (ID, error) {
func FindSnapshot(be lister, s string) (ID, error) {
// parse ID directly
if id, err := ParseID(s); err == nil {
return id, nil
@ -151,7 +151,7 @@ func FindSnapshot(be Server, s string) (ID, error) {
// PrefixLength returns the number of bytes required so that all prefixes of
// all IDs of type t are unique.
func PrefixLength(be Lister, t Type) (int, error) {
func PrefixLength(be lister, t Type) (int, error) {
// load all IDs of the given type
list, err := be.List(t)
if err != nil {