aboutsummaryrefslogtreecommitdiff
path: root/lib/msgstore.go
blob: 3c77c49c0a2e5cc6397c144588bb3f811a2b7e13 (plain)
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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
package lib

import (
	"github.com/emersion/go-imap"
	"github.com/mohamedattahri/mail"

	"git.sr.ht/~sircmpwn/aerc2/worker/types"
)

type MessageStore struct {
	Deleted  map[uint32]interface{}
	DirInfo  types.DirectoryInfo
	Messages map[uint32]*types.MessageInfo
	// Ordered list of known UIDs
	Uids []uint32

	bodyCallbacks   map[uint32][]func(*mail.Message)
	headerCallbacks map[uint32][]func(*types.MessageInfo)

	// Map of uids we've asked the worker to fetch
	onUpdate       func(store *MessageStore) // TODO: multiple onUpdate handlers
	pendingBodies  map[uint32]interface{}
	pendingHeaders map[uint32]interface{}
	worker         *types.Worker
}

func NewMessageStore(worker *types.Worker,
	dirInfo *types.DirectoryInfo) *MessageStore {

	return &MessageStore{
		Deleted: make(map[uint32]interface{}),
		DirInfo: *dirInfo,

		bodyCallbacks:   make(map[uint32][]func(*mail.Message)),
		headerCallbacks: make(map[uint32][]func(*types.MessageInfo)),

		pendingBodies:  make(map[uint32]interface{}),
		pendingHeaders: make(map[uint32]interface{}),
		worker:         worker,
	}
}

func (store *MessageStore) FetchHeaders(uids []uint32,
	cb func(*types.MessageInfo)) {

	// TODO: this could be optimized by pre-allocating toFetch and trimming it
	// at the end. In practice we expect to get most messages back in one frame.
	var toFetch imap.SeqSet
	for _, uid := range uids {
		if _, ok := store.pendingHeaders[uid]; !ok {
			toFetch.AddNum(uint32(uid))
			store.pendingHeaders[uid] = nil
			if cb != nil {
				if list, ok := store.headerCallbacks[uid]; ok {
					store.headerCallbacks[uid] = append(list, cb)
				} else {
					store.headerCallbacks[uid] = []func(*types.MessageInfo){cb}
				}
			}
		}
	}
	if !toFetch.Empty() {
		store.worker.PostAction(&types.FetchMessageHeaders{Uids: toFetch}, nil)
	}
}

func (store *MessageStore) FetchBodies(uids []uint32,
	cb func(*mail.Message)) {

	// TODO: this could be optimized by pre-allocating toFetch and trimming it
	// at the end. In practice we expect to get most messages back in one frame.
	var toFetch imap.SeqSet
	for _, uid := range uids {
		if _, ok := store.pendingBodies[uid]; !ok {
			toFetch.AddNum(uint32(uid))
			store.pendingBodies[uid] = nil
			if cb != nil {
				if list, ok := store.bodyCallbacks[uid]; ok {
					store.bodyCallbacks[uid] = append(list, cb)
				} else {
					store.bodyCallbacks[uid] = []func(*mail.Message){cb}
				}
			}
		}
	}
	if !toFetch.Empty() {
		store.worker.PostAction(&types.FetchMessageBodies{Uids: toFetch}, nil)
	}
}

func (store *MessageStore) merge(
	to *types.MessageInfo, from *types.MessageInfo) {

	// TODO: Merge more shit
	if from.Envelope != nil {
		to.Envelope = from.Envelope
	}
}

func (store *MessageStore) Update(msg types.WorkerMessage) {
	update := false
	switch msg := msg.(type) {
	case *types.DirectoryInfo:
		store.DirInfo = *msg
		update = true
	case *types.DirectoryContents:
		newMap := make(map[uint32]*types.MessageInfo)
		for _, uid := range msg.Uids {
			if msg, ok := store.Messages[uid]; ok {
				newMap[uid] = msg
			} else {
				newMap[uid] = nil
			}
		}
		store.Messages = newMap
		store.Uids = msg.Uids
		update = true
	case *types.MessageInfo:
		if existing, ok := store.Messages[msg.Uid]; ok && existing != nil {
			store.merge(existing, msg)
		} else {
			store.Messages[msg.Uid] = msg
		}
		if _, ok := store.pendingHeaders[msg.Uid]; msg.Envelope != nil && ok {
			delete(store.pendingHeaders, msg.Uid)
			if cbs, ok := store.headerCallbacks[msg.Uid]; ok {
				for _, cb := range cbs {
					cb(msg)
				}
			}
		}
		update = true
	case *types.MessageBody:
		if _, ok := store.pendingBodies[msg.Uid]; ok {
			delete(store.pendingBodies, msg.Uid)
			if cbs, ok := store.bodyCallbacks[msg.Uid]; ok {
				for _, cb := range cbs {
					cb(msg.Mail)
				}
			}
		}
	case *types.MessagesDeleted:
		toDelete := make(map[uint32]interface{})
		for _, uid := range msg.Uids {
			toDelete[uid] = nil
			delete(store.Messages, uid)
			if _, ok := store.Deleted[uid]; ok {
				delete(store.Deleted, uid)
			}
		}
		uids := make([]uint32, len(store.Uids)-len(msg.Uids))
		j := 0
		for i, uid := range store.Uids {
			if _, deleted := toDelete[uid]; !deleted {
				uids[j] = store.Uids[i]
				j += 1
			}
		}
		store.Uids = uids
		update = true
	}
	if update {
		store.update()
	}
}

func (store *MessageStore) OnUpdate(fn func(store *MessageStore)) {
	store.onUpdate = fn
}

func (store *MessageStore) update() {
	if store.onUpdate != nil {
		store.onUpdate(store)
	}
}

func (store *MessageStore) Delete(uids []uint32) {
	var set imap.SeqSet
	for _, uid := range uids {
		set.AddNum(uid)
		store.Deleted[uid] = nil
	}
	store.worker.PostAction(&types.DeleteMessages{Uids: set}, nil)
	store.update()
}