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pull.go
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pull.go
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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package drive
import (
"fmt"
"io"
"os"
"path/filepath"
"sync"
)
const (
maxNumOfConcPullTasks = 4
)
// Pull from remote if remote path exists and in a god context. If path is a
// directory, it recursively pulls from the remote if there are remote changes.
// It doesn't check if there are remote changes if isForce is set.
func (g *Commands) Pull() (err error) {
var r, l *File
if r, err = g.rem.FindByPath(g.opts.Path); err != nil {
return
}
absPath := g.context.AbsPathOf(g.opts.Path)
localinfo, _ := os.Stat(absPath)
if localinfo != nil {
l = NewLocalFile(absPath, localinfo)
}
var cl []*Change
fmt.Println("Resolving...")
if cl, err = g.resolveChangeListRecv(false, g.opts.Path, r, l); err != nil {
return
}
if ok := printChangeList(cl, g.opts.IsNoPrompt); ok {
return g.playPullChangeList(cl)
}
return
}
func (g *Commands) playPullChangeList(cl []*Change) (err error) {
var next []*Change
g.taskStart(len(cl))
for {
if len(cl) > maxNumOfConcPullTasks {
next, cl = cl[:maxNumOfConcPullTasks], cl[maxNumOfConcPullTasks:len(cl)]
} else {
next, cl = cl, []*Change{}
}
if len(next) == 0 {
break
}
var wg sync.WaitGroup
wg.Add(len(next))
// play the changes
// TODO: add timeouts
for _, c := range next {
switch c.Op() {
case OpMod:
go g.localMod(&wg, c)
case OpAdd:
go g.localAdd(&wg, c)
case OpDelete:
go g.localDelete(&wg, c)
}
}
wg.Wait()
}
g.taskFinish()
return err
}
func (g *Commands) localMod(wg *sync.WaitGroup, change *Change) (err error) {
defer g.taskDone()
defer wg.Done()
destAbsPath := g.context.AbsPathOf(change.Path)
if change.Src.BlobAt != "" {
// download and replace
if err = g.download(change); err != nil {
return
}
}
return os.Chtimes(destAbsPath, change.Src.ModTime, change.Src.ModTime)
}
func (g *Commands) localAdd(wg *sync.WaitGroup, change *Change) (err error) {
defer g.taskDone()
defer wg.Done()
destAbsPath := g.context.AbsPathOf(change.Path)
// make parent's dir if not exists
os.MkdirAll(filepath.Dir(destAbsPath), os.ModeDir|0755)
if change.Src.IsDir {
return os.Mkdir(destAbsPath, os.ModeDir|0755)
}
if change.Src.BlobAt != "" {
// download and create
if err = g.download(change); err != nil {
return
}
}
return os.Chtimes(destAbsPath, change.Src.ModTime, change.Src.ModTime)
}
func (g *Commands) localDelete(wg *sync.WaitGroup, change *Change) (err error) {
defer g.taskDone()
defer wg.Done()
return os.RemoveAll(change.Dest.BlobAt)
}
func (g *Commands) download(change *Change) (err error) {
destAbsPath := g.context.AbsPathOf(change.Path)
var fo *os.File
fo, err = os.Create(destAbsPath)
if err != nil {
return
}
// close fo on exit and check for its returned error
defer func() {
if err := fo.Close(); err != nil {
return
}
}()
var blob io.ReadCloser
defer func() {
if blob != nil {
blob.Close()
}
}()
blob, err = g.rem.Download(change.Src.Id)
if err != nil {
return err
}
_, err = io.Copy(fo, blob)
return
}