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pool.go
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pool.go
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package zip
import (
"context"
"io"
"sync"
"github.com/hashicorp/go-multierror"
)
var (
pool = sync.Pool{
New: func() interface{} {
buffer := make([]byte, 32*1024)
return &buffer
},
}
)
type Request struct {
Name string
Reader io.ReadCloser
}
type CompressorPool struct {
ctx context.Context
cancel func()
c chan *Request
wg sync.WaitGroup
zip *Writer
err error
}
func (self *CompressorPool) check_error(err error) {
if err == nil {
return
}
self.err = multierror.Append(self.err, err)
}
func (self *CompressorPool) Compress(request *Request) {
self.c <- request
}
func (self *CompressorPool) Close() error {
self.cancel()
self.wg.Wait()
return self.err
}
func NewCompressorPool(ctx context.Context, zip *Writer, size int) *CompressorPool {
sub_ctx, cancel := context.WithCancel(ctx)
self := &CompressorPool{
ctx: sub_ctx,
cancel: cancel,
c: make(chan *Request, size),
zip: zip,
}
for i := 0; i < size; i++ {
self.wg.Add(1)
go func() {
defer self.wg.Done()
for {
select {
case <-self.ctx.Done():
return
case request := <-self.c:
out_fd, err := self.zip.Create(request.Name)
self.check_error(err)
_, err = Copy(self.ctx, out_fd, request.Reader)
self.check_error(err)
self.check_error(out_fd.Close())
self.check_error(request.Reader.Close())
}
}
}()
}
return self
}
// An io.Copy() that respects context cancellations.
func Copy(ctx context.Context, dst io.Writer, src io.Reader) (n int, err error) {
offset := 0
buff := pool.Get().(*[]byte)
defer pool.Put(buff)
for {
select {
case <-ctx.Done():
return n, nil
default:
n, err = src.Read(*buff)
if err != nil && err != io.EOF {
return offset, err
}
if n == 0 {
return offset, nil
}
_, err = dst.Write((*buff)[:n])
if err != nil {
return offset, err
}
offset += n
}
}
}