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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package storage
import (
"context"
"errors"
"fmt"
"io"
"net/url"
"os"
"code.gitea.io/gitea/modules/setting"
)
var (
// ErrURLNotSupported represents url is not supported
ErrURLNotSupported = errors.New("url method not supported")
// ErrIterateObjectsNotSupported represents IterateObjects not supported
ErrIterateObjectsNotSupported = errors.New("iterateObjects method not supported")
)
// ErrInvalidConfiguration is called when there is invalid configuration for a storage
type ErrInvalidConfiguration struct {
cfg interface{}
err error
}
func (err ErrInvalidConfiguration) Error() string {
if err.err != nil {
return fmt.Sprintf("Invalid Configuration Argument: %v: Error: %v", err.cfg, err.err)
}
return fmt.Sprintf("Invalid Configuration Argument: %v", err.cfg)
}
// IsErrInvalidConfiguration checks if an error is an ErrInvalidConfiguration
func IsErrInvalidConfiguration(err error) bool {
_, ok := err.(ErrInvalidConfiguration)
return ok
}
// Type is a type of Storage
type Type string
// NewStorageFunc is a function that creates a storage
type NewStorageFunc func(ctx context.Context, cfg interface{}) (ObjectStorage, error)
var storageMap = map[Type]NewStorageFunc{}
// RegisterStorageType registers a provided storage type with a function to create it
func RegisterStorageType(typ Type, fn func(ctx context.Context, cfg interface{}) (ObjectStorage, error)) {
storageMap[typ] = fn
}
// Object represents the object on the storage
type Object interface {
io.ReadCloser
io.Seeker
Stat() (os.FileInfo, error)
}
// ObjectStorage represents an object storage to handle a bucket and files
type ObjectStorage interface {
Open(path string) (Object, error)
Save(path string, r io.Reader) (int64, error)
Stat(path string) (os.FileInfo, error)
Delete(path string) error
URL(path, name string) (*url.URL, error)
IterateObjects(func(path string, obj Object) error) error
}
// Copy copys a file from source ObjectStorage to dest ObjectStorage
func Copy(dstStorage ObjectStorage, dstPath string, srcStorage ObjectStorage, srcPath string) (int64, error) {
f, err := srcStorage.Open(srcPath)
if err != nil {
return 0, err
}
defer f.Close()
return dstStorage.Save(dstPath, f)
}
// SaveFrom saves data to the ObjectStorage with path p from the callback
func SaveFrom(objStorage ObjectStorage, p string, callback func(w io.Writer) error) error {
pr, pw := io.Pipe()
defer pr.Close()
go func() {
defer pw.Close()
if err := callback(pw); err != nil {
_ = pw.CloseWithError(err)
}
}()
_, err := objStorage.Save(p, pr)
return err
}
var (
// Attachments represents attachments storage
Attachments ObjectStorage
// LFS represents lfs storage
LFS ObjectStorage
// Avatars represents user avatars storage
Avatars ObjectStorage
// RepoAvatars represents repository avatars storage
RepoAvatars ObjectStorage
)
// Init init the stoarge
func Init() error {
if err := initAttachments(); err != nil {
return err
}
if err := initAvatars(); err != nil {
return err
}
if err := initRepoAvatars(); err != nil {
return err
}
return initLFS()
}
// NewStorage takes a storage type and some config and returns an ObjectStorage or an error
func NewStorage(typStr string, cfg interface{}) (ObjectStorage, error) {
if len(typStr) == 0 {
typStr = string(LocalStorageType)
}
fn, ok := storageMap[Type(typStr)]
if !ok {
return nil, fmt.Errorf("Unsupported storage type: %s", typStr)
}
return fn(context.Background(), cfg)
}
func initAvatars() (err error) {
Avatars, err = NewStorage(setting.Avatar.Storage.Type, setting.Avatar.Storage)
return
}
func initAttachments() (err error) {
Attachments, err = NewStorage(setting.Attachment.Storage.Type, setting.Attachment.Storage)
return
}
func initLFS() (err error) {
LFS, err = NewStorage(setting.LFS.Storage.Type, setting.LFS.Storage)
return
}
func initRepoAvatars() (err error) {
RepoAvatars, err = NewStorage(setting.RepoAvatar.Storage.Type, setting.RepoAvatar.Storage)
return
}
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