forked from keybase/client
/
stream.go
181 lines (155 loc) · 3.7 KB
/
stream.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 libkb
import (
"bufio"
"io"
"sync"
"golang.org/x/net/context"
keybase1 "github.com/keybase/client/go/protocol"
)
type ReadCloser struct {
f keybase1.Stream
}
type ExportedStream struct {
r io.ReadCloser
w io.WriteCloser
i int
}
type ExportedStreams struct {
m map[int]*ExportedStream
i int
sync.Mutex
}
func NewExportedStreams() *ExportedStreams {
return &ExportedStreams{
m: make(map[int]*ExportedStream),
i: 0,
}
}
func (s *ExportedStreams) ExportWriter(w io.WriteCloser) keybase1.Stream {
es := s.alloc()
es.w = w
return es.Export()
}
func (s *ExportedStreams) ExportReader(r io.ReadCloser) keybase1.Stream {
es := s.alloc()
es.r = r
return es.Export()
}
func (s *ExportedStreams) alloc() (ret *ExportedStream) {
s.Lock()
defer s.Unlock()
s.i++
i := s.i
ret = &ExportedStream{i: i}
s.m[i] = ret
return ret
}
func (s *ExportedStream) Export() keybase1.Stream {
return keybase1.Stream{Fd: s.i}
}
func (s *ExportedStreams) GetWriter(st keybase1.Stream) (ret io.WriteCloser, err error) {
s.Lock()
defer s.Unlock()
if obj, found := s.m[st.Fd]; !found {
err = StreamNotFoundError{}
} else if obj.w == nil {
err = StreamWrongKindError{}
} else {
ret = obj.w
}
return
}
func (s *ExportedStreams) GetReader(st keybase1.Stream) (ret io.ReadCloser, err error) {
s.Lock()
defer s.Unlock()
if obj, found := s.m[st.Fd]; !found {
err = StreamNotFoundError{}
} else if obj.r == nil {
err = StreamWrongKindError{}
} else {
ret = obj.r
}
return
}
func (s *ExportedStreams) Close(_ context.Context, a keybase1.CloseArg) (err error) {
s.Lock()
defer s.Unlock()
if obj, found := s.m[a.S.Fd]; !found {
err = StreamNotFoundError{}
} else {
if obj.w != nil {
err = obj.w.Close()
}
if obj.r != nil {
tmp := obj.r.Close()
if tmp != nil && err == nil {
err = tmp
}
}
delete(s.m, a.S.Fd)
}
return err
}
func (s *ExportedStreams) Read(_ context.Context, a keybase1.ReadArg) (buf []byte, err error) {
var r io.ReadCloser
if r, err = s.GetReader(a.S); err != nil {
return
}
var n int
buf = make([]byte, a.Sz)
n, err = r.Read(buf)
buf = buf[0:n]
return
}
func (s *ExportedStreams) Write(_ context.Context, a keybase1.WriteArg) (n int, err error) {
var w io.WriteCloser
if w, err = s.GetWriter(a.S); err != nil {
return
}
n, err = w.Write(a.Buf)
return
}
type RemoteStream struct {
Stream keybase1.Stream
Cli *keybase1.StreamUiClient
SessionID int
}
func (ewc RemoteStream) Write(buf []byte) (n int, err error) {
return ewc.Cli.Write(context.TODO(), keybase1.WriteArg{S: ewc.Stream, Buf: buf, SessionID: ewc.SessionID})
}
func (ewc RemoteStream) Close() (err error) {
return ewc.Cli.Close(context.TODO(), keybase1.CloseArg{S: ewc.Stream, SessionID: ewc.SessionID})
}
func (ewc RemoteStream) Read(buf []byte) (n int, err error) {
var tmp []byte
if tmp, err = ewc.Cli.Read(context.TODO(), keybase1.ReadArg{S: ewc.Stream, Sz: len(buf), SessionID: ewc.SessionID}); err == nil {
n = len(tmp)
copy(buf, tmp)
}
return
}
type RemoteStreamBuffered struct {
rs *RemoteStream
r *bufio.Reader
w *bufio.Writer
}
func NewRemoteStreamBuffered(s keybase1.Stream, c *keybase1.StreamUiClient, sessionID int) *RemoteStreamBuffered {
x := &RemoteStreamBuffered{
rs: &RemoteStream{Stream: s, Cli: c, SessionID: sessionID},
}
x.r = bufio.NewReader(x.rs)
x.w = bufio.NewWriter(x.rs)
return x
}
func (x *RemoteStreamBuffered) Write(p []byte) (int, error) {
return x.w.Write(p)
}
func (x *RemoteStreamBuffered) Read(p []byte) (int, error) {
return x.r.Read(p)
}
func (x *RemoteStreamBuffered) Close() error {
x.w.Flush()
return x.rs.Close()
}