1 4b33cdd0 2015-11-30 stephen.d package p9p
  2 4b33cdd0 2015-11-30 stephen.d 
  3 4b33cdd0 2015-11-30 stephen.d import (
  4 f3174901 2022-11-26 op 	"context"
  5 c74282f8 2016-11-16 noreply 	"io"
  6 4b33cdd0 2015-11-30 stephen.d 	"net"
  7 4b33cdd0 2015-11-30 stephen.d )
  8 4b33cdd0 2015-11-30 stephen.d 
  9 4b33cdd0 2015-11-30 stephen.d type client struct {
 10 4b33cdd0 2015-11-30 stephen.d 	version   string
 11 4b33cdd0 2015-11-30 stephen.d 	msize     int
 12 4b33cdd0 2015-11-30 stephen.d 	ctx       context.Context
 13 4b33cdd0 2015-11-30 stephen.d 	transport roundTripper
 14 4b33cdd0 2015-11-30 stephen.d }
 15 4b33cdd0 2015-11-30 stephen.d 
 16 4b33cdd0 2015-11-30 stephen.d // NewSession returns a session using the connection. The Context ctx provides
 17 4b33cdd0 2015-11-30 stephen.d // a context for out of bad messages, such as flushes, that may be sent by the
 18 4b33cdd0 2015-11-30 stephen.d // session. The session can effectively shutdown with this context.
 19 4b33cdd0 2015-11-30 stephen.d func NewSession(ctx context.Context, conn net.Conn) (Session, error) {
 20 4b33cdd0 2015-11-30 stephen.d 	ch := newChannel(conn, codec9p{}, DefaultMSize) // sets msize, effectively.
 21 4b33cdd0 2015-11-30 stephen.d 
 22 4b33cdd0 2015-11-30 stephen.d 	// negotiate the protocol version
 23 4b33cdd0 2015-11-30 stephen.d 	version, err := clientnegotiate(ctx, ch, DefaultVersion)
 24 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
 25 4b33cdd0 2015-11-30 stephen.d 		return nil, err
 26 4b33cdd0 2015-11-30 stephen.d 	}
 27 4b33cdd0 2015-11-30 stephen.d 
 28 4b33cdd0 2015-11-30 stephen.d 	return &client{
 29 4b33cdd0 2015-11-30 stephen.d 		version:   version,
 30 4b33cdd0 2015-11-30 stephen.d 		msize:     ch.MSize(),
 31 4b33cdd0 2015-11-30 stephen.d 		ctx:       ctx,
 32 4b33cdd0 2015-11-30 stephen.d 		transport: newTransport(ctx, ch),
 33 4b33cdd0 2015-11-30 stephen.d 	}, nil
 34 4b33cdd0 2015-11-30 stephen.d }
 35 4b33cdd0 2015-11-30 stephen.d 
 36 4b33cdd0 2015-11-30 stephen.d var _ Session = &client{}
 37 4b33cdd0 2015-11-30 stephen.d 
 38 4b33cdd0 2015-11-30 stephen.d func (c *client) Version() (int, string) {
 39 4b33cdd0 2015-11-30 stephen.d 	return c.msize, c.version
 40 4b33cdd0 2015-11-30 stephen.d }
 41 4b33cdd0 2015-11-30 stephen.d 
 42 4b33cdd0 2015-11-30 stephen.d func (c *client) Auth(ctx context.Context, afid Fid, uname, aname string) (Qid, error) {
 43 4b33cdd0 2015-11-30 stephen.d 	m := MessageTauth{
 44 4b33cdd0 2015-11-30 stephen.d 		Afid:  afid,
 45 4b33cdd0 2015-11-30 stephen.d 		Uname: uname,
 46 4b33cdd0 2015-11-30 stephen.d 		Aname: aname,
 47 4b33cdd0 2015-11-30 stephen.d 	}
 48 4b33cdd0 2015-11-30 stephen.d 
 49 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, m)
 50 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
 51 5eb5d0b1 2016-05-19 stevvooe 		return Qid{}, err
 52 4b33cdd0 2015-11-30 stephen.d 	}
 53 4b33cdd0 2015-11-30 stephen.d 
 54 4b33cdd0 2015-11-30 stephen.d 	rauth, ok := resp.(MessageRauth)
 55 4b33cdd0 2015-11-30 stephen.d 	if !ok {
 56 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, ErrUnexpectedMsg
 57 4b33cdd0 2015-11-30 stephen.d 	}
 58 4b33cdd0 2015-11-30 stephen.d 
 59 4b33cdd0 2015-11-30 stephen.d 	return rauth.Qid, nil
 60 4b33cdd0 2015-11-30 stephen.d }
 61 4b33cdd0 2015-11-30 stephen.d 
 62 4b33cdd0 2015-11-30 stephen.d func (c *client) Attach(ctx context.Context, fid, afid Fid, uname, aname string) (Qid, error) {
 63 4b33cdd0 2015-11-30 stephen.d 	m := MessageTattach{
 64 4b33cdd0 2015-11-30 stephen.d 		Fid:   fid,
 65 4b33cdd0 2015-11-30 stephen.d 		Afid:  afid,
 66 4b33cdd0 2015-11-30 stephen.d 		Uname: uname,
 67 4b33cdd0 2015-11-30 stephen.d 		Aname: aname,
 68 4b33cdd0 2015-11-30 stephen.d 	}
 69 4b33cdd0 2015-11-30 stephen.d 
 70 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, m)
 71 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
 72 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, err
 73 4b33cdd0 2015-11-30 stephen.d 	}
 74 4b33cdd0 2015-11-30 stephen.d 
 75 4b33cdd0 2015-11-30 stephen.d 	rattach, ok := resp.(MessageRattach)
 76 4b33cdd0 2015-11-30 stephen.d 	if !ok {
 77 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, ErrUnexpectedMsg
 78 4b33cdd0 2015-11-30 stephen.d 	}
 79 4b33cdd0 2015-11-30 stephen.d 
 80 4b33cdd0 2015-11-30 stephen.d 	return rattach.Qid, nil
 81 4b33cdd0 2015-11-30 stephen.d }
 82 4b33cdd0 2015-11-30 stephen.d 
 83 4b33cdd0 2015-11-30 stephen.d func (c *client) Clunk(ctx context.Context, fid Fid) error {
 84 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTclunk{
 85 4b33cdd0 2015-11-30 stephen.d 		Fid: fid,
 86 4b33cdd0 2015-11-30 stephen.d 	})
 87 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
 88 4b33cdd0 2015-11-30 stephen.d 		return err
 89 4b33cdd0 2015-11-30 stephen.d 	}
 90 4b33cdd0 2015-11-30 stephen.d 
 91 4b33cdd0 2015-11-30 stephen.d 	_, ok := resp.(MessageRclunk)
 92 4b33cdd0 2015-11-30 stephen.d 	if !ok {
 93 4b33cdd0 2015-11-30 stephen.d 		return ErrUnexpectedMsg
 94 4b33cdd0 2015-11-30 stephen.d 	}
 95 4b33cdd0 2015-11-30 stephen.d 
 96 4b33cdd0 2015-11-30 stephen.d 	return nil
 97 4b33cdd0 2015-11-30 stephen.d }
 98 4b33cdd0 2015-11-30 stephen.d 
 99 4b33cdd0 2015-11-30 stephen.d func (c *client) Remove(ctx context.Context, fid Fid) error {
100 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTremove{
101 4b33cdd0 2015-11-30 stephen.d 		Fid: fid,
102 4b33cdd0 2015-11-30 stephen.d 	})
103 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
104 4b33cdd0 2015-11-30 stephen.d 		return err
105 4b33cdd0 2015-11-30 stephen.d 	}
106 4b33cdd0 2015-11-30 stephen.d 
107 4b33cdd0 2015-11-30 stephen.d 	_, ok := resp.(MessageRremove)
108 4b33cdd0 2015-11-30 stephen.d 	if !ok {
109 4b33cdd0 2015-11-30 stephen.d 		return ErrUnexpectedMsg
110 4b33cdd0 2015-11-30 stephen.d 	}
111 4b33cdd0 2015-11-30 stephen.d 
112 4b33cdd0 2015-11-30 stephen.d 	return nil
113 4b33cdd0 2015-11-30 stephen.d }
114 4b33cdd0 2015-11-30 stephen.d 
115 4b33cdd0 2015-11-30 stephen.d func (c *client) Walk(ctx context.Context, fid Fid, newfid Fid, names ...string) ([]Qid, error) {
116 4b33cdd0 2015-11-30 stephen.d 	if len(names) > 16 {
117 4b33cdd0 2015-11-30 stephen.d 		return nil, ErrWalkLimit
118 4b33cdd0 2015-11-30 stephen.d 	}
119 4b33cdd0 2015-11-30 stephen.d 
120 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTwalk{
121 4b33cdd0 2015-11-30 stephen.d 		Fid:    fid,
122 4b33cdd0 2015-11-30 stephen.d 		Newfid: newfid,
123 4b33cdd0 2015-11-30 stephen.d 		Wnames: names,
124 4b33cdd0 2015-11-30 stephen.d 	})
125 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
126 4b33cdd0 2015-11-30 stephen.d 		return nil, err
127 4b33cdd0 2015-11-30 stephen.d 	}
128 4b33cdd0 2015-11-30 stephen.d 
129 4b33cdd0 2015-11-30 stephen.d 	rwalk, ok := resp.(MessageRwalk)
130 4b33cdd0 2015-11-30 stephen.d 	if !ok {
131 4b33cdd0 2015-11-30 stephen.d 		return nil, ErrUnexpectedMsg
132 4b33cdd0 2015-11-30 stephen.d 	}
133 4b33cdd0 2015-11-30 stephen.d 
134 4b33cdd0 2015-11-30 stephen.d 	return rwalk.Qids, nil
135 4b33cdd0 2015-11-30 stephen.d }
136 4b33cdd0 2015-11-30 stephen.d 
137 4b33cdd0 2015-11-30 stephen.d func (c *client) Read(ctx context.Context, fid Fid, p []byte, offset int64) (n int, err error) {
138 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTread{
139 4b33cdd0 2015-11-30 stephen.d 		Fid:    fid,
140 4b33cdd0 2015-11-30 stephen.d 		Offset: uint64(offset),
141 4b33cdd0 2015-11-30 stephen.d 		Count:  uint32(len(p)),
142 4b33cdd0 2015-11-30 stephen.d 	})
143 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
144 4b33cdd0 2015-11-30 stephen.d 		return 0, err
145 4b33cdd0 2015-11-30 stephen.d 	}
146 4b33cdd0 2015-11-30 stephen.d 
147 4b33cdd0 2015-11-30 stephen.d 	rread, ok := resp.(MessageRread)
148 4b33cdd0 2015-11-30 stephen.d 	if !ok {
149 4b33cdd0 2015-11-30 stephen.d 		return 0, ErrUnexpectedMsg
150 4b33cdd0 2015-11-30 stephen.d 	}
151 4b33cdd0 2015-11-30 stephen.d 
152 c74282f8 2016-11-16 noreply 	n = copy(p, rread.Data)
153 c74282f8 2016-11-16 noreply 	switch {
154 c74282f8 2016-11-16 noreply 	case len(rread.Data) == 0:
155 c74282f8 2016-11-16 noreply 		err = io.EOF
156 c74282f8 2016-11-16 noreply 	case n < len(p):
157 c74282f8 2016-11-16 noreply 		// TODO(stevvooe): Technically, we should treat this as an io.EOF.
158 c74282f8 2016-11-16 noreply 		// However, we cannot tell if the short read was due to EOF or due to
159 c74282f8 2016-11-16 noreply 		// truncation.
160 c74282f8 2016-11-16 noreply 	}
161 c74282f8 2016-11-16 noreply 
162 c74282f8 2016-11-16 noreply 	return n, err
163 4b33cdd0 2015-11-30 stephen.d }
164 4b33cdd0 2015-11-30 stephen.d 
165 4b33cdd0 2015-11-30 stephen.d func (c *client) Write(ctx context.Context, fid Fid, p []byte, offset int64) (n int, err error) {
166 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTwrite{
167 4b33cdd0 2015-11-30 stephen.d 		Fid:    fid,
168 4b33cdd0 2015-11-30 stephen.d 		Offset: uint64(offset),
169 4b33cdd0 2015-11-30 stephen.d 		Data:   p,
170 4b33cdd0 2015-11-30 stephen.d 	})
171 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
172 4b33cdd0 2015-11-30 stephen.d 		return 0, err
173 4b33cdd0 2015-11-30 stephen.d 	}
174 4b33cdd0 2015-11-30 stephen.d 
175 4b33cdd0 2015-11-30 stephen.d 	rwrite, ok := resp.(MessageRwrite)
176 4b33cdd0 2015-11-30 stephen.d 	if !ok {
177 4b33cdd0 2015-11-30 stephen.d 		return 0, ErrUnexpectedMsg
178 4b33cdd0 2015-11-30 stephen.d 	}
179 4b33cdd0 2015-11-30 stephen.d 
180 c74282f8 2016-11-16 noreply 	if int(rwrite.Count) < len(p) {
181 c74282f8 2016-11-16 noreply 		err = io.ErrShortWrite
182 c74282f8 2016-11-16 noreply 	}
183 c74282f8 2016-11-16 noreply 
184 c74282f8 2016-11-16 noreply 	return int(rwrite.Count), err
185 4b33cdd0 2015-11-30 stephen.d }
186 4b33cdd0 2015-11-30 stephen.d 
187 4b33cdd0 2015-11-30 stephen.d func (c *client) Open(ctx context.Context, fid Fid, mode Flag) (Qid, uint32, error) {
188 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTopen{
189 4b33cdd0 2015-11-30 stephen.d 		Fid:  fid,
190 4b33cdd0 2015-11-30 stephen.d 		Mode: mode,
191 4b33cdd0 2015-11-30 stephen.d 	})
192 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
193 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, 0, err
194 4b33cdd0 2015-11-30 stephen.d 	}
195 4b33cdd0 2015-11-30 stephen.d 
196 4b33cdd0 2015-11-30 stephen.d 	ropen, ok := resp.(MessageRopen)
197 4b33cdd0 2015-11-30 stephen.d 	if !ok {
198 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, 0, ErrUnexpectedMsg
199 4b33cdd0 2015-11-30 stephen.d 	}
200 4b33cdd0 2015-11-30 stephen.d 
201 4b33cdd0 2015-11-30 stephen.d 	return ropen.Qid, ropen.IOUnit, nil
202 4b33cdd0 2015-11-30 stephen.d }
203 4b33cdd0 2015-11-30 stephen.d 
204 4b33cdd0 2015-11-30 stephen.d func (c *client) Create(ctx context.Context, parent Fid, name string, perm uint32, mode Flag) (Qid, uint32, error) {
205 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTcreate{
206 4b33cdd0 2015-11-30 stephen.d 		Fid:  parent,
207 4b33cdd0 2015-11-30 stephen.d 		Name: name,
208 4b33cdd0 2015-11-30 stephen.d 		Perm: perm,
209 4b33cdd0 2015-11-30 stephen.d 		Mode: mode,
210 4b33cdd0 2015-11-30 stephen.d 	})
211 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
212 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, 0, err
213 4b33cdd0 2015-11-30 stephen.d 	}
214 4b33cdd0 2015-11-30 stephen.d 
215 4b33cdd0 2015-11-30 stephen.d 	rcreate, ok := resp.(MessageRcreate)
216 4b33cdd0 2015-11-30 stephen.d 	if !ok {
217 4b33cdd0 2015-11-30 stephen.d 		return Qid{}, 0, ErrUnexpectedMsg
218 4b33cdd0 2015-11-30 stephen.d 	}
219 4b33cdd0 2015-11-30 stephen.d 
220 4b33cdd0 2015-11-30 stephen.d 	return rcreate.Qid, rcreate.IOUnit, nil
221 4b33cdd0 2015-11-30 stephen.d }
222 4b33cdd0 2015-11-30 stephen.d 
223 4b33cdd0 2015-11-30 stephen.d func (c *client) Stat(ctx context.Context, fid Fid) (Dir, error) {
224 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTstat{Fid: fid})
225 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
226 4b33cdd0 2015-11-30 stephen.d 		return Dir{}, err
227 4b33cdd0 2015-11-30 stephen.d 	}
228 4b33cdd0 2015-11-30 stephen.d 
229 4b33cdd0 2015-11-30 stephen.d 	rstat, ok := resp.(MessageRstat)
230 4b33cdd0 2015-11-30 stephen.d 	if !ok {
231 4b33cdd0 2015-11-30 stephen.d 		return Dir{}, ErrUnexpectedMsg
232 4b33cdd0 2015-11-30 stephen.d 	}
233 4b33cdd0 2015-11-30 stephen.d 
234 4b33cdd0 2015-11-30 stephen.d 	return rstat.Stat, nil
235 4b33cdd0 2015-11-30 stephen.d }
236 4b33cdd0 2015-11-30 stephen.d 
237 4b33cdd0 2015-11-30 stephen.d func (c *client) WStat(ctx context.Context, fid Fid, dir Dir) error {
238 4b33cdd0 2015-11-30 stephen.d 	resp, err := c.transport.send(ctx, MessageTwstat{
239 4b33cdd0 2015-11-30 stephen.d 		Fid:  fid,
240 4b33cdd0 2015-11-30 stephen.d 		Stat: dir,
241 4b33cdd0 2015-11-30 stephen.d 	})
242 4b33cdd0 2015-11-30 stephen.d 	if err != nil {
243 4b33cdd0 2015-11-30 stephen.d 		return err
244 4b33cdd0 2015-11-30 stephen.d 	}
245 4b33cdd0 2015-11-30 stephen.d 
246 4b33cdd0 2015-11-30 stephen.d 	_, ok := resp.(MessageRwstat)
247 4b33cdd0 2015-11-30 stephen.d 	if !ok {
248 4b33cdd0 2015-11-30 stephen.d 		return ErrUnexpectedMsg
249 4b33cdd0 2015-11-30 stephen.d 	}
250 4b33cdd0 2015-11-30 stephen.d 
251 4b33cdd0 2015-11-30 stephen.d 	return nil
252 4b33cdd0 2015-11-30 stephen.d }