forked from keybase/client
/
sync_trackers2.go
134 lines (117 loc) · 2.93 KB
/
sync_trackers2.go
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// 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 Tracker2Syncer struct {
sync.Mutex
Contextified
res *keybase1.UserSummary2Set
reverse bool
dirty bool
callerUID keybase1.UID
}
const cacheTimeout = 10 * time.Minute
func (t *Tracker2Syncer) dbKey(u keybase1.UID) DbKey {
if t.reverse {
return DbKeyUID(DBTrackers2Reverse, u)
}
return DbKeyUID(DBTrackers2, u)
}
func (t *Tracker2Syncer) loadFromStorage(uid keybase1.UID) error {
var err error
var found bool
var tmp keybase1.UserSummary2Set
defer t.G().Trace(fmt.Sprintf("loadFromStorage(%s)", uid), func() error { return err })()
found, err = t.G().LocalDb.GetInto(&tmp, t.dbKey(uid))
if err != nil {
return err
}
if !found {
t.G().Log.Debug("| no cached copy found")
return nil
}
cachedAt := keybase1.FromTime(tmp.Time)
if time.Now().Sub(cachedAt) > cacheTimeout {
t.G().Log.Debug("| expired; cached at %s", cachedAt)
return nil
}
t.G().Log.Debug("| found a record, cached %s", cachedAt)
t.res = &tmp
return nil
}
func (t *Tracker2Syncer) getLoadedVersion() int {
ret := -1
if t.res != nil {
ret = t.res.Version
}
return ret
}
func (t *Tracker2Syncer) syncFromServer(uid keybase1.UID, sr SessionReader) (err error) {
defer t.G().Trace(fmt.Sprintf("syncFromServer(%s)", uid), func() error { return err })()
hargs := HTTPArgs{
"uid": UIDArg(uid),
"reverse": B{t.reverse},
"autoCamel": B{true},
"caller_uid": UIDArg(t.callerUID),
}
lv := t.getLoadedVersion()
if lv >= 0 {
hargs.Add("version", I{lv})
}
var res *APIRes
res, err = t.G().API.Get(APIArg{
Endpoint: "user/list_followers_for_display",
Args: hargs,
SessionR: sr,
})
t.G().Log.Debug("| syncFromServer() -> %s", ErrToOk(err))
if err != nil {
return err
}
var tmp keybase1.UserSummary2Set
if err = res.Body.UnmarshalAgain(&tmp); err != nil {
return
}
tmp.Time = keybase1.ToTime(time.Now())
if lv < 0 || tmp.Version > lv {
t.G().Log.Debug("| syncFromServer(): got update %d > %d (%d records)", tmp.Version, lv,
len(tmp.Users))
t.res = &tmp
t.dirty = true
} else {
t.G().Log.Debug("| syncFromServer(): no change needed @ %d", lv)
}
return nil
}
func (t *Tracker2Syncer) store(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 *Tracker2Syncer) needsLogin() bool {
return false
}
func (t *Tracker2Syncer) Result() keybase1.UserSummary2Set {
if t.res == nil {
return keybase1.UserSummary2Set{}
}
return *t.res
}
func NewTracker2Syncer(g *GlobalContext, callerUID keybase1.UID, reverse bool) *Tracker2Syncer {
return &Tracker2Syncer{
Contextified: NewContextified(g),
reverse: reverse,
callerUID: callerUID,
}
}