1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
package imap
import (
"github.com/emersion/go-imap"
"github.com/emersion/go-imap/client"
"git.sr.ht/~rjarry/aerc/lib/log"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/types"
)
// drainUpdates will drain the updates channel. For some operations, the imap
// server will send unilateral messages. If they arrive while another operation
// is in progress, the buffered updates channel can fill up and cause a freeze
// of the entire backend. Avoid this by draining the updates channel and only
// process the Message and Expunge updates.
//
// To stop the draining, close the returned struct.
func (imapw *IMAPWorker) drainUpdates() *drainCloser {
done := make(chan struct{})
go func() {
defer log.PanicHandler()
for {
select {
case update := <-imapw.updates:
switch update.(type) {
case *client.MessageUpdate,
*client.ExpungeUpdate:
imapw.handleImapUpdate(update)
}
case <-done:
return
}
}
}()
return &drainCloser{done}
}
type drainCloser struct {
done chan struct{}
}
func (d *drainCloser) Close() error {
close(d.done)
return nil
}
func (imapw *IMAPWorker) handleDeleteMessages(msg *types.DeleteMessages) {
drain := imapw.drainUpdates()
defer drain.Close()
item := imap.FormatFlagsOp(imap.AddFlags, true)
flags := []interface{}{imap.DeletedFlag}
uids := toSeqSet(msg.Uids)
if err := imapw.client.UidStore(uids, item, flags, nil); err != nil {
imapw.worker.PostMessage(&types.Error{
Message: types.RespondTo(msg),
Error: err,
}, nil)
return
}
if err := imapw.client.Expunge(nil); err != nil {
imapw.worker.PostMessage(&types.Error{
Message: types.RespondTo(msg),
Error: err,
}, nil)
} else {
imapw.worker.PostMessage(&types.Done{Message: types.RespondTo(msg)}, nil)
}
}
func (imapw *IMAPWorker) handleAnsweredMessages(msg *types.AnsweredMessages) {
item := imap.FormatFlagsOp(imap.AddFlags, false)
flags := []interface{}{imap.AnsweredFlag}
if !msg.Answered {
item = imap.FormatFlagsOp(imap.RemoveFlags, false)
}
imapw.handleStoreOps(msg, msg.Uids, item, flags,
func(_msg *imap.Message) error {
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
Flags: translateImapFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
return nil
})
}
func (imapw *IMAPWorker) handleFlagMessages(msg *types.FlagMessages) {
flags := []interface{}{flagToImap[msg.Flags]}
item := imap.FormatFlagsOp(imap.AddFlags, false)
if !msg.Enable {
item = imap.FormatFlagsOp(imap.RemoveFlags, false)
}
imapw.handleStoreOps(msg, msg.Uids, item, flags,
func(_msg *imap.Message) error {
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
Flags: translateImapFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
return nil
})
}
func (imapw *IMAPWorker) handleStoreOps(
msg types.WorkerMessage, uids []uint32, item imap.StoreItem, flag interface{},
procFunc func(*imap.Message) error,
) {
messages := make(chan *imap.Message)
done := make(chan error)
go func() {
defer log.PanicHandler()
var reterr error
for _msg := range messages {
err := procFunc(_msg)
if err != nil {
if reterr == nil {
reterr = err
}
// drain the channel upon error
for range messages {
}
}
}
done <- reterr
}()
emitErr := func(err error) {
imapw.worker.PostMessage(&types.Error{
Message: types.RespondTo(msg),
Error: err,
}, nil)
}
set := toSeqSet(uids)
if err := imapw.client.UidStore(set, item, flag, messages); err != nil {
emitErr(err)
return
}
if err := <-done; err != nil {
emitErr(err)
return
}
imapw.worker.PostAction(&types.CheckMail{
Directories: []string{imapw.selected.Name},
}, nil)
imapw.worker.PostMessage(
&types.Done{Message: types.RespondTo(msg)}, nil)
}
|
