/
db.go
222 lines (191 loc) · 4.05 KB
/
db.go
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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
package main
import (
"database/sql"
"fmt"
"io/ioutil"
"log"
"strconv"
"strings"
"sync"
"time"
_ "github.com/mattn/go-sqlite3"
)
type chat struct {
id int64
stellarAccount string
sanityCheck time.Time
}
var rwLock sync.RWMutex
var accounts map[string]map[int64]struct{}
var chats map[int64]*chat
var tradePageToken = "now"
var paymentPageToken = "now"
var db *sql.DB
func numAccounts() int {
return len(accounts)
}
func numChats() int {
return len(chats)
}
func setTradePageToken(t string) {
tradePageToken = t
}
func setOperationPageToken(t string) {
paymentPageToken = t
}
func getTradePageToken() string {
return tradePageToken
}
func getOperationPageToken() string {
return paymentPageToken
}
func chatSanity(id int64, d time.Duration) bool {
rwLock.Lock()
defer rwLock.Unlock()
chat := chats[id]
if chat != nil {
if time.Since(chat.sanityCheck) > d {
chat.sanityCheck = time.Now()
return true
}
}
return false
}
func loadFromStorage() error {
rwLock.Lock()
defer rwLock.Unlock()
rows, err := db.Query("select id, stellar_account from chats;")
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var id int64
var stellarAccount string
err = rows.Scan(&id, &stellarAccount)
if err != nil {
return err
}
chats[id] = &chat{id: id, stellarAccount: stellarAccount}
if stellarAccount != "" {
chatIDs := accounts[stellarAccount]
if chatIDs == nil {
chatIDs = make(map[int64]struct{})
accounts[stellarAccount] = chatIDs
}
chatIDs[id] = struct{}{}
}
}
err = rows.Err()
if err != nil {
return err
}
return nil
}
func getChat(id int64) *chat {
rwLock.RLock()
defer rwLock.RUnlock()
return chats[id]
}
func newChat(id int64, account string) error {
rwLock.Lock()
defer rwLock.Unlock()
_, err := db.Exec("insert into chats(id, stellar_account) values(?,?);", id, account)
if err != nil {
return err
}
chats[id] = &chat{id: id, stellarAccount: account}
chatIDs := accounts[account]
if chatIDs == nil {
chatIDs = make(map[int64]struct{})
accounts[account] = chatIDs
}
chatIDs[id] = struct{}{}
return nil
}
func deleteChat(id int64) error {
rwLock.Lock()
defer rwLock.Unlock()
chat := chats[id]
if chat == nil {
return fmt.Errorf("Chat not found")
}
_, err := db.Exec("delete from chats where id=?;", chat.id)
if err != nil {
return err
}
delete(accounts[chat.stellarAccount], id)
if len(accounts[chat.stellarAccount]) == 0 {
delete(accounts, chat.stellarAccount)
}
delete(chats, id)
return nil
}
func getChatsByAccount(account string) (result []int64) {
rwLock.RLock()
defer rwLock.RUnlock()
chatIDs := accounts[account]
if chatIDs == nil {
return
}
for k := range chatIDs {
result = append(result, k)
}
return
}
func setupStorage(f string) (err error) {
accounts = make(map[string]map[int64]struct{})
chats = make(map[int64]*chat)
loadCheckpoint()
log.Printf("Opening database: %s", f)
db, err = sql.Open("sqlite3", f)
if err != nil {
return
}
_, err = db.Exec("create table if not exists chats (id integer not null primary key, stellar_account text);")
if err != nil {
return
}
err = loadFromStorage()
if err != nil {
return
}
return
}
func saveCheckpoint() {
err := ioutil.WriteFile(appPath+"/checkpoint", []byte(fmt.Sprintf("%s,%s,%d", paymentPageToken, tradePageToken, time.Now().Unix())), 0644)
if err != nil {
fmt.Printf("Fail saving checkpoint: %v", err)
} else {
fmt.Printf("Checkpoint saved")
}
}
func loadCheckpoint() {
data, err := ioutil.ReadFile(appPath + "/checkpoint")
if err != nil {
return
}
chunks := strings.Split(string(data), ",")
if len(chunks) != 3 {
return
}
ts, err := strconv.ParseInt(chunks[2], 10, 64)
if err != nil {
return
}
if (time.Now().Unix() - ts) > 300 {
log.Printf("Checkpoint older than 300 seconds... starting from now")
return
}
paymentPageToken = chunks[0]
tradePageToken = chunks[1]
log.Printf("Resume from Payment:%s Trade:%s", paymentPageToken, tradePageToken)
}
func closeStorage() error {
saveCheckpoint()
if db != nil {
db.Close()
db = nil
}
return nil
}