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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: models.Uint32ToUid(_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: models.Uint32ToUid(_msg.Uid),
},
}, nil)
return nil
})
}
func (imapw *IMAPWorker) handleStoreOps(
msg types.WorkerMessage, uids []models.UID, 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)
}
|
