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Migrate this project to minio micro services code
This commit is contained in:
Harshavardhana
435
pkg/fs/fs.go
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435
pkg/fs/fs.go
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@@ -0,0 +1,435 @@
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/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package fs
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import (
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"os"
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"runtime"
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"strings"
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"sync"
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"time"
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"io/ioutil"
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"path/filepath"
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"github.com/minio/minio-xl/pkg/probe"
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)
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// API - local variables
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type API struct {
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path string
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lock *sync.Mutex
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multiparts *Multiparts
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}
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// MultipartSession holds active session information
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type MultipartSession struct {
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TotalParts int
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UploadID string
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Initiated time.Time
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Parts []*PartMetadata
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}
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// Multiparts collection of many parts
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type Multiparts struct {
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Version string `json:"version"`
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ActiveSession map[string]*MultipartSession `json:"activeSessions"`
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}
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// New instantiate a new donut
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func New(path string) (CloudStorage, *probe.Error) {
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var err *probe.Error
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// load multiparts session from disk
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var multiparts *Multiparts
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multiparts, err = loadMultipartsSession()
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if err != nil {
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if os.IsNotExist(err.ToGoError()) {
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multiparts = &Multiparts{
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Version: "1",
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ActiveSession: make(map[string]*MultipartSession),
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}
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if err := SaveMultipartsSession(multiparts); err != nil {
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return nil, err.Trace()
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}
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} else {
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return nil, err.Trace()
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}
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}
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a := API{
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path: path,
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lock: new(sync.Mutex),
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}
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a.multiparts = multiparts
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return a, nil
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}
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/// Bucket Operations
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// DeleteBucket - delete bucket
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func (fs API) DeleteBucket(bucket string) *probe.Error {
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fs.lock.Lock()
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defer fs.lock.Unlock()
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// verify bucket path legal
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if !IsValidBucket(bucket) {
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return probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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bucketDir := filepath.Join(fs.path, bucket)
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// check bucket exists
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if _, err := os.Stat(bucketDir); os.IsNotExist(err) {
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return probe.NewError(BucketNotFound{Bucket: bucket})
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}
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files, err := ioutil.ReadDir(bucketDir)
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if err != nil {
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return probe.NewError(err)
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}
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if len(files) > 0 {
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return probe.NewError(BucketNotEmpty{Bucket: bucket})
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}
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if err := os.Remove(bucketDir); err != nil {
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return probe.NewError(err)
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}
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return nil
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}
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// ListBuckets - Get service
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func (fs API) ListBuckets() ([]BucketMetadata, *probe.Error) {
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fs.lock.Lock()
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defer fs.lock.Unlock()
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files, err := ioutil.ReadDir(fs.path)
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if err != nil {
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return []BucketMetadata{}, probe.NewError(err)
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}
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var metadataList []BucketMetadata
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for _, file := range files {
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if !file.IsDir() {
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// if files found ignore them
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continue
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}
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if file.IsDir() {
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// if directories found with odd names, skip them too
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if !IsValidBucket(file.Name()) {
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continue
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}
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}
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metadata := BucketMetadata{
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Name: file.Name(),
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Created: file.ModTime(),
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}
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metadataList = append(metadataList, metadata)
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}
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return metadataList, nil
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}
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// MakeBucket - PUT Bucket
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func (fs API) MakeBucket(bucket, acl string) *probe.Error {
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fs.lock.Lock()
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defer fs.lock.Unlock()
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// verify bucket path legal
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if !IsValidBucket(bucket) {
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return probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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// get bucket path
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bucketDir := filepath.Join(fs.path, bucket)
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// check if bucket exists
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if _, err := os.Stat(bucketDir); err == nil {
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return probe.NewError(BucketExists{
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Bucket: bucket,
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})
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}
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// make bucket
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err := os.Mkdir(bucketDir, aclToPerm(acl))
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if err != nil {
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return probe.NewError(err)
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}
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return nil
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}
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// GetBucketMetadata -
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func (fs API) GetBucketMetadata(bucket string) (BucketMetadata, *probe.Error) {
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fs.lock.Lock()
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defer fs.lock.Unlock()
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if !IsValidBucket(bucket) {
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return BucketMetadata{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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// get bucket path
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bucketDir := filepath.Join(fs.path, bucket)
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bucketMetadata := BucketMetadata{}
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fi, err := os.Stat(bucketDir)
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// check if bucket exists
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if os.IsNotExist(err) {
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return BucketMetadata{}, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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if err != nil {
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return BucketMetadata{}, probe.NewError(err)
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}
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bucketMetadata.Name = fi.Name()
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bucketMetadata.Created = fi.ModTime()
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bucketMetadata.ACL = permToACL(fi.Mode())
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return bucketMetadata, nil
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}
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// permToACL - convert perm to meaningful ACL
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func permToACL(mode os.FileMode) BucketACL {
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switch mode.Perm() {
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case os.FileMode(0700):
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return BucketACL("private")
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case os.FileMode(0500):
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return BucketACL("public-read")
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case os.FileMode(0777):
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return BucketACL("public-read-write")
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default:
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return BucketACL("private")
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}
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}
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// aclToPerm - convert acl to filesystem mode
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func aclToPerm(acl string) os.FileMode {
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switch acl {
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case "private":
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return os.FileMode(0700)
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case "public-read":
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return os.FileMode(0500)
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case "public-read-write":
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return os.FileMode(0777)
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default:
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return os.FileMode(0700)
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}
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}
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// SetBucketMetadata -
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func (fs API) SetBucketMetadata(bucket string, metadata map[string]string) *probe.Error {
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fs.lock.Lock()
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defer fs.lock.Unlock()
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if !IsValidBucket(bucket) {
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return probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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acl := metadata["acl"]
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if !IsValidBucketACL(acl) {
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return probe.NewError(InvalidACL{ACL: acl})
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}
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// get bucket path
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bucketDir := filepath.Join(fs.path, bucket)
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err := os.Chmod(bucketDir, aclToPerm(acl))
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if err != nil {
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return probe.NewError(err)
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}
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return nil
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}
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// ListObjects - GET bucket (list objects)
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func (fs API) ListObjects(bucket string, resources BucketResourcesMetadata) ([]ObjectMetadata, BucketResourcesMetadata, *probe.Error) {
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if !IsValidBucket(bucket) {
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return nil, resources, probe.NewError(BucketNameInvalid{Bucket: bucket})
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}
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if resources.Prefix != "" && IsValidObjectName(resources.Prefix) == false {
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return nil, resources, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: resources.Prefix})
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}
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p := bucketDir{}
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rootPrefix := filepath.Join(fs.path, bucket)
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// check bucket exists
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if _, err := os.Stat(rootPrefix); os.IsNotExist(err) {
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return nil, resources, probe.NewError(BucketNotFound{Bucket: bucket})
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}
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p.root = rootPrefix
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/// automatically treat "/" delimiter as "\\" delimiter on windows due to its path constraints.
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if resources.Delimiter == "/" {
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if runtime.GOOS == "windows" {
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resources.Delimiter = "\\"
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}
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}
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// If delimiter is supplied make sure that paging doesn't go deep, treat it as simple directory listing.
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if resources.Delimiter != "" {
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files, err := ioutil.ReadDir(filepath.Join(rootPrefix, resources.Prefix))
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if err != nil {
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if os.IsNotExist(err) {
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return nil, resources, probe.NewError(ObjectNotFound{Bucket: bucket, Object: resources.Prefix})
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}
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return nil, resources, probe.NewError(err)
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}
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for _, fl := range files {
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prefix := fl.Name()
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if resources.Prefix != "" {
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prefix = filepath.Join(resources.Prefix, fl.Name())
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}
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p.files = append(p.files, contentInfo{
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Prefix: prefix,
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Size: fl.Size(),
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Mode: fl.Mode(),
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ModTime: fl.ModTime(),
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FileInfo: fl,
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})
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}
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} else {
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var files []contentInfo
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getAllFiles := func(fp string, fl os.FileInfo, err error) error {
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// If any error return back quickly
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if err != nil {
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return err
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}
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if strings.HasSuffix(fp, "$multiparts") {
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return nil
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}
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// if file pointer equals to rootPrefix - discard it
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if fp == p.root {
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return nil
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}
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if len(files) > resources.Maxkeys {
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return ErrSkipFile
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}
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// Split the root prefix from the incoming file pointer
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realFp := ""
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if runtime.GOOS == "windows" {
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if splits := strings.Split(fp, p.root+"\\"); len(splits) > 1 {
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realFp = splits[1]
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}
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} else {
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if splits := strings.Split(fp, p.root+"/"); len(splits) > 1 {
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realFp = splits[1]
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}
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}
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// If path is a directory and has a prefix verify if the file pointer
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// has the prefix if it does not skip the directory.
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if fl.Mode().IsDir() {
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if resources.Prefix != "" {
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if !strings.HasPrefix(fp, filepath.Join(p.root, resources.Prefix)) {
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return ErrSkipDir
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}
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}
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}
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// If path is a directory and has a marker verify if the file split file pointer
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// is lesser than the Marker top level directory if yes skip it.
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if fl.Mode().IsDir() {
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if resources.Marker != "" {
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if realFp != "" {
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if runtime.GOOS == "windows" {
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if realFp < strings.Split(resources.Marker, "\\")[0] {
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return ErrSkipDir
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}
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} else {
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if realFp < strings.Split(resources.Marker, "/")[0] {
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return ErrSkipDir
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}
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}
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}
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}
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}
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// If regular file verify
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if fl.Mode().IsRegular() {
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// If marker is present this will be used to check if filepointer is
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// lexically higher than then Marker
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if realFp != "" {
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if resources.Marker != "" {
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if realFp > resources.Marker {
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files = append(files, contentInfo{
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Prefix: realFp,
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Size: fl.Size(),
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Mode: fl.Mode(),
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ModTime: fl.ModTime(),
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FileInfo: fl,
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})
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}
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} else {
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files = append(files, contentInfo{
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Prefix: realFp,
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Size: fl.Size(),
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Mode: fl.Mode(),
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ModTime: fl.ModTime(),
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FileInfo: fl,
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})
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}
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}
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}
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// If file is a symlink follow it and populate values.
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if fl.Mode()&os.ModeSymlink == os.ModeSymlink {
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st, err := os.Stat(fp)
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if err != nil {
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return nil
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}
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// If marker is present this will be used to check if filepointer is
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// lexically higher than then Marker
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if realFp != "" {
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if resources.Marker != "" {
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if realFp > resources.Marker {
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files = append(files, contentInfo{
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Prefix: realFp,
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Size: st.Size(),
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Mode: st.Mode(),
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ModTime: st.ModTime(),
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FileInfo: st,
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})
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}
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} else {
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files = append(files, contentInfo{
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Prefix: realFp,
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Size: st.Size(),
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Mode: st.Mode(),
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ModTime: st.ModTime(),
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FileInfo: st,
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})
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}
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}
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}
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p.files = files
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return nil
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}
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// If no delimiter is specified, crawl through everything.
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err := Walk(rootPrefix, getAllFiles)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, resources, probe.NewError(ObjectNotFound{Bucket: bucket, Object: resources.Prefix})
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}
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return nil, resources, probe.NewError(err)
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}
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}
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var metadataList []ObjectMetadata
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var metadata ObjectMetadata
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// Filter objects
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for _, content := range p.files {
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if len(metadataList) == resources.Maxkeys {
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resources.IsTruncated = true
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if resources.IsTruncated && resources.Delimiter != "" {
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resources.NextMarker = metadataList[len(metadataList)-1].Object
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}
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break
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}
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if content.Prefix > resources.Marker {
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var err *probe.Error
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metadata, resources, err = fs.filterObjects(bucket, content, resources)
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if err != nil {
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return nil, resources, err.Trace()
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}
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if metadata.Bucket != "" {
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metadataList = append(metadataList, metadata)
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}
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}
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}
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return metadataList, resources, nil
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}
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