269 lines
5.0 KiB
Go
269 lines
5.0 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package goldsmith
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import (
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"log"
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"os"
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"path/filepath"
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"sync"
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"sync/atomic"
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"time"
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)
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type stage struct {
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input, output chan *file
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}
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type goldsmith struct {
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srcDir, dstDir string
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stages []*stage
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refs map[string]bool
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mtx sync.Mutex
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active int64
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stalled int64
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tainted bool
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}
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func (gs *goldsmith) fault(s *stage, f *file, err error) {
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log.Print("%s\t%s\t%s", s, f, err)
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gs.tainted = true
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}
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func (gs *goldsmith) queueFiles(target uint) {
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files := make(chan string)
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go scanDir(gs.srcDir, files, nil)
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s := gs.newStage()
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go func() {
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defer close(s.output)
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for path := range files {
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for {
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if gs.active-gs.stalled >= int64(target) {
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time.Sleep(time.Millisecond)
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} else {
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break
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}
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}
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relPath, err := filepath.Rel(gs.srcDir, path)
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if err != nil {
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panic(err)
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}
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gs.CopyFile(relPath, path)
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}
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}()
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}
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func (gs *goldsmith) cleanupFiles() {
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var (
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files = make(chan string)
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dirs = make(chan string)
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)
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go scanDir(gs.dstDir, files, dirs)
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for files != nil || dirs != nil {
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var (
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path string
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ok bool
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)
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select {
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case path, ok = <-files:
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if !ok {
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files = nil
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continue
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}
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case path, ok = <-dirs:
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if !ok {
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dirs = nil
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continue
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}
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default:
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continue
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}
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relPath, err := filepath.Rel(gs.dstDir, path)
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if err != nil {
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panic(err)
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}
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if contained, _ := gs.refs[relPath]; contained {
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continue
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}
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os.RemoveAll(path)
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}
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}
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func (gs *goldsmith) exportFile(f *file) error {
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defer atomic.AddInt64(&gs.active, -1)
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absPath := filepath.Join(gs.dstDir, f.path)
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if err := f.export(absPath); err != nil {
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return err
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}
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gs.RefFile(f.path)
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return nil
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}
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func (gs *goldsmith) newStage() *stage {
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s := &stage{output: make(chan *file)}
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if len(gs.stages) > 0 {
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s.input = gs.stages[len(gs.stages)-1].output
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}
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gs.stages = append(gs.stages, s)
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return s
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}
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func (gs *goldsmith) chain(s *stage, p Plugin) {
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defer close(s.output)
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init, _ := p.(Initializer)
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accept, _ := p.(Accepter)
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proc, _ := p.(Processor)
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fin, _ := p.(Finalizer)
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var (
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wg sync.WaitGroup
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mtx sync.Mutex
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batch []File
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)
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dispatch := func(f *file) {
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if fin == nil {
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s.output <- f
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} else {
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mtx.Lock()
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batch = append(batch, f)
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mtx.Unlock()
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atomic.AddInt64(&gs.stalled, 1)
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}
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}
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if init != nil {
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if err := init.Initialize(gs); err != nil {
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gs.fault(s, nil, err)
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return
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}
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}
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for f := range s.input {
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if accept != nil && !accept.Accept(f) {
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s.output <- f
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} else if proc == nil {
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dispatch(f)
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} else {
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wg.Add(1)
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go func(f *file) {
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defer wg.Done()
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if err := proc.Process(gs, f); err != nil {
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gs.fault(s, f, err)
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}
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dispatch(f)
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}(f)
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}
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}
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wg.Wait()
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if fin != nil {
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if err := fin.Finalize(gs, batch); err != nil {
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gs.fault(s, nil, err)
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}
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for _, f := range batch {
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atomic.AddInt64(&gs.stalled, -1)
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s.output <- f.(*file)
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}
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}
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}
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func (gs *goldsmith) Chain(p Plugin) Goldsmith {
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go gs.chain(gs.newStage(), p)
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return gs
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}
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func (gs *goldsmith) Complete() bool {
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s := gs.stages[len(gs.stages)-1]
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for f := range s.output {
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gs.exportFile(f)
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}
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gs.cleanupFiles()
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tainted := gs.tainted
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gs.stages = nil
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gs.refs = nil
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gs.tainted = false
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return tainted
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}
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func (gs *goldsmith) NewFile(path string, data []byte) File {
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atomic.AddInt64(&gs.active, 1)
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return newFileFromData(path, data)
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}
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func (gs *goldsmith) CopyFile(dst, src string) File {
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atomic.AddInt64(&gs.active, 1)
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return newFileFromPath(dst, src)
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}
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func (gs *goldsmith) RefFile(path string) {
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gs.mtx.Lock()
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defer gs.mtx.Unlock()
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if gs.refs == nil {
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gs.refs = make(map[string]bool)
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}
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path = cleanPath(path)
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for {
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gs.refs[path] = true
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if path == "." {
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break
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}
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path = filepath.Dir(path)
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}
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}
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func (gs *goldsmith) SrcDir() string {
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return gs.srcDir
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}
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func (gs *goldsmith) DstDir() string {
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return gs.dstDir
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}
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