/
sync_trackers.go
187 lines (160 loc) · 4.48 KB
/
sync_trackers.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
// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package libkb
import (
"fmt"
"sync"
"time"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
)
type FollowDirection int
const (
FollowDirectionFollowing FollowDirection = 0
FollowDirectionFollowers FollowDirection = 1
)
func directionToReverse(direction FollowDirection) (reverse bool) {
return direction == FollowDirectionFollowing
}
type ServertrustTrackerSyncer struct {
sync.Mutex
Contextified
res *keybase1.UserSummarySet
direction FollowDirection
dirty bool
callerUID keybase1.UID
}
const cacheTimeout = 10 * time.Minute
func (t *ServertrustTrackerSyncer) dbKey(u keybase1.UID) DbKey {
if t.direction == FollowDirectionFollowing {
return DbKeyUID(DBUnverifiedTrackersFollowing, u)
}
return DbKeyUID(DBUnverifiedTrackersFollowers, u)
}
func (t *ServertrustTrackerSyncer) loadFromStorage(m MetaContext, uid keybase1.UID, useExpiration bool) error {
var err error
var found bool
var tmp keybase1.UserSummarySet
defer m.Trace(fmt.Sprintf("loadFromStorage(%s)", uid), &err)()
found, err = t.G().LocalDb.GetInto(&tmp, t.dbKey(uid))
if err != nil {
return err
}
if !found {
m.Debug("| no cached copy found")
return nil
}
cachedAt := keybase1.FromTime(tmp.Time)
if useExpiration && time.Since(cachedAt) > cacheTimeout {
m.Debug("| expired; cached at %s", cachedAt)
return nil
}
m.Debug("| found a record, cached %s", cachedAt)
t.res = &tmp
return nil
}
func (t *ServertrustTrackerSyncer) getLoadedVersion() int {
ret := -1
if t.res != nil {
ret = t.res.Version
}
return ret
}
func (t *ServertrustTrackerSyncer) syncFromServer(m MetaContext, uid keybase1.UID, forceReload bool) (err error) {
defer m.Trace(fmt.Sprintf("syncFromServer(%s)", uid), &err)()
hargs := HTTPArgs{
"uid": UIDArg(uid),
"reverse": B{directionToReverse(t.direction)},
"autoCamel": B{true},
"caller_uid": UIDArg(t.callerUID),
}
lv := t.getLoadedVersion()
if lv >= 0 && !forceReload {
hargs.Add("version", I{lv})
}
var res *APIRes
res, err = m.G().API.Get(m, APIArg{
Endpoint: "user/list_followers_for_display",
Args: hargs,
})
m.Debug("| syncFromServer() -> %s", ErrToOk(err))
if err != nil {
return err
}
var tmp keybase1.UserSummarySet
if err = res.Body.UnmarshalAgain(&tmp); err != nil {
return
}
tmp.Time = keybase1.ToTime(time.Now())
if lv < 0 || tmp.Version > lv || forceReload {
m.Debug("| syncFromServer(): got update %d > %d (%d records)", tmp.Version, lv,
len(tmp.Users))
t.res = &tmp
t.dirty = true
} else {
m.Debug("| syncFromServer(): no change needed @ %d", lv)
}
return nil
}
func (t *ServertrustTrackerSyncer) store(m MetaContext, uid keybase1.UID) error {
var err error
if !t.dirty {
return err
}
if err = t.G().LocalDb.PutObj(t.dbKey(uid), nil, t.res); err != nil {
return err
}
t.dirty = false
return nil
}
func (t *ServertrustTrackerSyncer) needsLogin(m MetaContext) bool {
return false
}
func (t *ServertrustTrackerSyncer) Block(m MetaContext, badUIDs map[keybase1.UID]bool) (err error) {
defer m.Trace(fmt.Sprintf("ServertrustTrackerSyncer#Block(%+v)", badUIDs), &err)()
t.Lock()
defer t.Unlock()
if t.direction != FollowDirectionFollowers {
return fmt.Errorf("can only delete users out of followers cache")
}
if t.res == nil {
m.Debug("No followers loaded, so nothing to do")
return nil
}
err = t.loadFromStorage(m, t.callerUID, true)
if err != nil {
return err
}
var newUsers []keybase1.UserSummary
for _, userSummary := range t.res.Users {
if badUIDs[userSummary.Uid] {
m.Debug("Filtering bad user out of state: %s", userSummary.Uid)
t.dirty = true
} else {
newUsers = append(newUsers, userSummary)
}
}
t.res.Users = newUsers
err = t.store(m, t.callerUID)
return err
}
func (t *ServertrustTrackerSyncer) Result() keybase1.UserSummarySet {
if t.res == nil {
return keybase1.UserSummarySet{}
}
// Normalize usernames
var normalizedUsers []keybase1.UserSummary
for _, u := range t.res.Users {
normalizedUser := u
normalizedUser.Username = NewNormalizedUsername(u.Username).String()
normalizedUsers = append(normalizedUsers, normalizedUser)
}
t.res.Users = normalizedUsers
return *t.res
}
func NewServertrustTrackerSyncer(g *GlobalContext, callerUID keybase1.UID, direction FollowDirection) *ServertrustTrackerSyncer {
return &ServertrustTrackerSyncer{
Contextified: NewContextified(g),
direction: direction,
callerUID: callerUID,
}
}