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// Package memory is a storage backend base on memory
package memory
import (
"fmt"
"gopkg.in/src-d/go-git.v4/config"
"gopkg.in/src-d/go-git.v4/core"
)
var ErrUnsupportedObjectType = fmt.Errorf("unsupported object type")
// Storage in memory storage system
type Storage struct {
c *ConfigStorage
o *ObjectStorage
r *ReferenceStorage
}
// NewStorage returns a new Storage
func NewStorage() *Storage {
return &Storage{}
}
// ConfigStorage return the ConfigStorage, if not exists create a new one
func (s *Storage) ConfigStorage() config.ConfigStorage {
if s.c != nil {
return s.c
}
s.c = &ConfigStorage{
RemotesConfig: make(map[string]*config.RemoteConfig),
}
return s.c
}
// ObjectStorage returns the ObjectStorage, if not exists creates a new one
func (s *Storage) ObjectStorage() core.ObjectStorage {
if s.o != nil {
return s.o
}
s.o = &ObjectStorage{
Objects: make(map[core.Hash]core.Object, 0),
Commits: make(map[core.Hash]core.Object, 0),
Trees: make(map[core.Hash]core.Object, 0),
Blobs: make(map[core.Hash]core.Object, 0),
Tags: make(map[core.Hash]core.Object, 0),
}
return s.o
}
// ReferenceStorage returns the ReferenceStorage if not exists creates a new one
func (s *Storage) ReferenceStorage() core.ReferenceStorage {
if s.r != nil {
return s.r
}
r := make(ReferenceStorage, 0)
s.r = &r
return s.r
}
type ConfigStorage struct {
RemotesConfig map[string]*config.RemoteConfig
}
func (c *ConfigStorage) Remote(name string) (*config.RemoteConfig, error) {
r, ok := c.RemotesConfig[name]
if ok {
return r, nil
}
return nil, config.ErrRemoteConfigNotFound
}
func (c *ConfigStorage) Remotes() ([]*config.RemoteConfig, error) {
var o []*config.RemoteConfig
for _, r := range c.RemotesConfig {
o = append(o, r)
}
return o, nil
}
func (c *ConfigStorage) SetRemote(r *config.RemoteConfig) error {
c.RemotesConfig[r.Name] = r
return nil
}
func (c *ConfigStorage) DeleteRemote(name string) error {
delete(c.RemotesConfig, name)
return nil
}
// ObjectStorage is the implementation of core.ObjectStorage for memory.Object
type ObjectStorage struct {
Objects map[core.Hash]core.Object
Commits map[core.Hash]core.Object
Trees map[core.Hash]core.Object
Blobs map[core.Hash]core.Object
Tags map[core.Hash]core.Object
}
// NewObject creates a new MemoryObject
func (o *ObjectStorage) NewObject() core.Object {
return &core.MemoryObject{}
}
// Set stores an object, the object should be properly filled before set it.
func (o *ObjectStorage) Set(obj core.Object) (core.Hash, error) {
h := obj.Hash()
o.Objects[h] = obj
switch obj.Type() {
case core.CommitObject:
o.Commits[h] = o.Objects[h]
case core.TreeObject:
o.Trees[h] = o.Objects[h]
case core.BlobObject:
o.Blobs[h] = o.Objects[h]
case core.TagObject:
o.Tags[h] = o.Objects[h]
default:
return h, ErrUnsupportedObjectType
}
return h, nil
}
// Get returns a object with the given hash
func (o *ObjectStorage) Get(t core.ObjectType, h core.Hash) (core.Object, error) {
obj, ok := o.Objects[h]
if !ok || (core.AnyObject != t && obj.Type() != t) {
return nil, core.ErrObjectNotFound
}
return obj, nil
}
// Iter returns a core.ObjectIter for the given core.ObjectTybe
func (o *ObjectStorage) Iter(t core.ObjectType) (core.ObjectIter, error) {
var series []core.Object
switch t {
case core.AnyObject:
series = flattenObjectMap(o.Objects)
case core.CommitObject:
series = flattenObjectMap(o.Commits)
case core.TreeObject:
series = flattenObjectMap(o.Trees)
case core.BlobObject:
series = flattenObjectMap(o.Blobs)
case core.TagObject:
series = flattenObjectMap(o.Tags)
}
return core.NewObjectSliceIter(series), nil
}
func flattenObjectMap(m map[core.Hash]core.Object) []core.Object {
objects := make([]core.Object, 0, len(m))
for _, obj := range m {
objects = append(objects, obj)
}
return objects
}
type ReferenceStorage map[core.ReferenceName]*core.Reference
// Set stores a reference.
func (r ReferenceStorage) Set(ref *core.Reference) error {
if ref != nil {
r[ref.Name()] = ref
}
return nil
}
// Get returns a stored reference with the given name
func (r ReferenceStorage) Get(n core.ReferenceName) (*core.Reference, error) {
ref, ok := r[n]
if !ok {
return nil, core.ErrReferenceNotFound
}
return ref, nil
}
// Iter returns a core.ReferenceIter
func (r ReferenceStorage) Iter() (core.ReferenceIter, error) {
var refs []*core.Reference
for _, ref := range r {
refs = append(refs, ref)
}
return core.NewReferenceSliceIter(refs), nil
}
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