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file_server.go
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/
file_server.go
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package main
import (
"os"
)
type fileRequest struct {
path string
flags int
f func(f *os.File) error
res chan error
}
type FileService struct {
reqs chan fileRequest
}
func NewFileService(workers int) *FileService {
fs := &FileService{make(chan fileRequest, 1000)}
for i := 0; i < workers; i++ {
go fs.worker()
}
return fs
}
func (f *FileService) Do(path string, flags int, fn func(*os.File) error) error {
r := fileRequest{path, flags, fn, make(chan error, 1)}
f.reqs <- r
return <-r.res
}
func (f *FileService) Close() error {
close(f.reqs)
return nil
}
func serviceFileRequest(r fileRequest) {
f, err := os.OpenFile(r.path, r.flags, 0666)
if err == nil {
defer f.Close()
err = r.f(f)
}
r.res <- err
}
func (f *FileService) worker() {
for req := range f.reqs {
serviceFileRequest(req)
}
}