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files.go
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files.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package client
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol"
)
type Source interface {
io.ReadCloser
Open() error
}
type Sink interface {
io.WriteCloser
Open() error
HitError(err error) error
}
type BufferSource struct {
data string
buf *bytes.Buffer
}
func NewBufferSource(s string) *BufferSource {
return &BufferSource{data: s}
}
func (b *BufferSource) Open() error {
b.buf = bytes.NewBufferString(b.data)
return nil
}
func (b *BufferSource) Read(p []byte) (n int, err error) {
return b.buf.Read(p)
}
func (b *BufferSource) Close() error { return nil }
type StdinSource struct {
open bool
}
func (b *StdinSource) Open() error {
b.open = true
return nil
}
func drain(f *os.File) error {
buf := make([]byte, 1024*64)
var err error
var n int
eof := false
for !eof && err == nil {
if n, err = f.Read(buf); n == 0 && err != nil {
eof = true
if err == io.EOF {
err = nil
}
}
}
return err
}
// Close a source, but consume all leftover input before so doing.
func (b *StdinSource) Close() error {
var err error
if b.open {
err = drain(os.Stdin)
}
b.open = false
return err
}
func (b *StdinSource) Read(p []byte) (n int, err error) {
if b.open {
n, err := os.Stdin.Read(p)
if n == 0 {
b.open = false
}
return n, err
}
return 0, io.EOF
}
type FileSource struct {
name string
file *os.File
}
func NewFileSource(s string) *FileSource {
return &FileSource{name: s}
}
func (s *FileSource) Open() error {
f, err := os.OpenFile(s.name, os.O_RDONLY, 0)
if err != nil {
return err
}
s.file = f
return nil
}
func (s *FileSource) Close() error {
if s.file == nil {
return nil
}
err := s.file.Close()
s.file = nil
return err
}
func (s *FileSource) Read(p []byte) (n int, err error) {
if s.file == nil {
return 0, io.EOF
}
if n, err = s.file.Read(p); n == 0 || err != nil {
s.file.Close()
s.file = nil
}
return n, err
}
type StdoutSink struct {
open bool
}
func (s *StdoutSink) Open() error {
s.open = true
return nil
}
func (s *StdoutSink) Close() error {
s.open = false
return nil
}
func (s *StdoutSink) Write(b []byte) (n int, err error) {
return os.Stdout.Write(b)
}
func (s *StdoutSink) HitError(e error) error { return nil }
type FileSink struct {
name string
file *os.File
bufw *bufio.Writer
opened bool
closed bool
failed bool
}
func NewFileSink(s string) *FileSink {
return &FileSink{name: s}
}
func (s *FileSink) Open() error {
// Lazy-open on first write
return nil
}
func (s *FileSink) lazyOpen() error {
var err error
if s.closed {
err = fmt.Errorf("file was already closed")
} else if s.failed {
err = fmt.Errorf("open previously failed")
} else if !s.opened {
flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
mode := libkb.UmaskablePermFile
f, err := os.OpenFile(s.name, flags, mode)
if err != nil {
s.failed = true
return fmt.Errorf("Failed to open %s for writing: %s",
s.name, err)
}
s.file = f
s.bufw = bufio.NewWriter(f)
s.opened = true
}
return err
}
func (s *FileSink) Write(b []byte) (n int, err error) {
if err = s.lazyOpen(); err != nil {
return
}
return s.bufw.Write(b)
}
func (s *FileSink) Close() error {
var err error
if s.opened && !s.closed {
s.bufw.Flush()
err = s.file.Close()
s.file = nil
s.bufw = nil
s.closed = true
}
return err
}
func (s *FileSink) HitError(e error) error {
var err error
if e != nil && s.opened {
G.Log.Debug("Deleting file %s after error %s", s.name, e)
err = os.Remove(s.name)
}
return err
}
type UnixFilter struct {
sink Sink
source Source
}
func initSink(fn string) Sink {
if len(fn) == 0 || fn == "-" {
return &StdoutSink{}
}
return NewFileSink(fn)
}
func initSource(msg, infile string) (Source, error) {
if len(msg) > 0 && len(infile) > 0 {
return nil, fmt.Errorf("Can't handle both a passed message and an infile")
}
if len(msg) > 0 {
return NewBufferSource(msg), nil
}
if len(infile) == 0 || infile == "-" {
return &StdinSource{}, nil
}
return NewFileSource(infile), nil
}
func (u *UnixFilter) FilterInit(msg, infile, outfile string) (err error) {
u.source, err = initSource(msg, infile)
if err == nil {
u.sink = initSink(outfile)
}
return err
}
func (u *UnixFilter) FilterOpen() error {
err := u.sink.Open()
if err == nil {
err = u.source.Open()
}
return err
}
func (u *UnixFilter) Close(inerr error) error {
e1 := u.source.Close()
e2 := u.sink.Close()
e3 := u.sink.HitError(inerr)
return libkb.PickFirstError(e1, e2, e3)
}
func (u *UnixFilter) ClientFilterOpen() (snk, src keybase1.Stream, err error) {
if err = u.FilterOpen(); err != nil {
return
}
snk = G.XStreams.ExportWriter(u.sink)
src = G.XStreams.ExportReader(u.source)
return
}