func (this *SyncMgr) onNotify(remote int, fp *crypto.Digest, in io.Reader, out io.Writer) error {
var mesgs []dataMesg
err := transfer.Decode(in, &mesgs)
if err != nil {
return err
}
// Find client
this.cmut.Lock()
cl, ok := this.clients[fp.String()]
this.cmut.Unlock()
if !ok {
this.Log.Printf("Receiving notify from non-friend, ignoring")
}
for _, mesg := range mesgs {
this.Log.Printf("Received data, topic = %s, key = %s", mesg.Topic, mesg.Key)
row := this.Db.SingleQuery(`SELECT heard_seqno FROM TopicFriend
WHERE topic = ? AND friend_id = ? AND desired = 1`,
mesg.Topic, remote)
var prev_seq int
if !this.Db.MaybeScan(row, &prev_seq) {
continue
}
sink, ok := this.sinks[mesg.RecordType]
if !ok || prev_seq >= mesg.Seqno {
continue
}
sink(cl.friendId, fp, &mesg.Record)
this.Db.Exec("Update TopicFriend SET heard_seqno = ? WHERE topic = ? AND friend_id = ?",
mesg.Seqno, mesg.Topic, remote)
}
return nil
}
// Reads from io.Reader and generates a new object, put it to the meta-data layer
func (this *DataMgr) GetData(topic string, key string, stream io.Writer) error {
data := this.Get(topic, key)
if data == nil {
return fmt.Errorf("Unknown key")
}
var objHash *crypto.Digest
err := transfer.DecodeBytes(data, &objHash)
if err != nil {
return err
}
okey := objHash.String()
this.lock.Lock()
obj := this.maybeGetObj(okey)
if obj == nil || obj.State != DSLocal {
return fmt.Errorf("File not local yet")
}
obj.Holds++
this.writeObj(obj)
this.lock.Unlock()
name := path.Join(this.dir, okey)
file, err := os.Open(name)
if err == nil {
_, err = io.Copy(stream, file)
}
this.lock.Lock()
obj = this.getObj(okey)
obj.Holds--
this.writeObj(obj)
this.lock.Unlock()
return err
}
// Add a new friend, or if the friend exists, update the host and port data.
func (this *LinkMgr) RemoveFriend(fp *crypto.Digest) {
this.cmut.Lock()
defer this.cmut.Unlock()
fi, ok := this.friendsFp[fp.String()]
if !ok {
return
}
for _, f := range this.listeners {
f(fi.id, fp, FriendRemoved)
}
this.Db.Exec("DELETE FROM FRIEND WHERE id = ?", fi.id)
delete(this.friendsFp, fp.String())
delete(this.friendsId, fi.id)
}
// Add a new friend, or if the friend exists, update the host and port data.
func (this *LinkMgr) AddUpdateFriend(fp *crypto.Digest, host string, port uint16) {
this.cmut.Lock()
defer this.cmut.Unlock()
// Make or insert friend
this.Db.Exec(
"INSERT OR IGNORE INTO Friend (id, fingerprint, host, port) VALUES (NULL, ?, ?, ?)",
fp.Bytes(), host, port)
row := this.Db.SingleQuery("SELECT id FROM Friend WHERE fingerprint = ?", fp.Bytes())
var id int
this.Db.Scan(row, &id)
this.Db.Exec("UPDATE Friend SET host = ?, port = ? WHERE id = ?",
host, port, id)
_, ok := this.friendsFp[fp.String()]
fi := &friendInfo{id: id, fingerprint: fp, host: host, port: port}
this.friendsFp[fp.String()] = fi
this.friendsId[id] = fi
if !ok {
// If it was added, signal upper layer
for _, f := range this.listeners {
f(id, fp, FriendAdded)
}
}
}
// Kicks off the link manager, presumes Callbacks has been set
func (this *LinkMgr) Run() error {
conn, err := net.Listen("tcp", this.server.Addr)
if err != nil {
return err
}
this.listener = tls.NewListener(conn, this.server.TLSConfig)
rows := this.Db.MultiQuery("SELECT id, fingerprint, isgdid, host, port FROM Friend")
for rows.Next() {
var id int
var isgdid int
var fp []byte
var host string
var port uint16
this.Db.Scan(rows, &id, &fp, &isgdid, &host, &port)
var fingerprint *crypto.Digest
err := transfer.DecodeBytes(fp, &fingerprint)
if err != nil {
panic(err)
}
fi := &friendInfo{
id: id,
fingerprint: fingerprint,
isgdid: isgdid,
host: host,
port: port,
}
this.friendsFp[fingerprint.String()] = fi
this.friendsId[id] = fi
}
this.cmut.RLock()
for id, fi := range this.friendsId {
for _, f := range this.listeners {
f(id, fi.fingerprint, FriendStartup)
}
}
this.cmut.RUnlock()
this.wait.Add(1)
go func() {
this.server.Serve(this.listener)
this.wait.Done()
}()
return nil
}
func (this *SyncMgr) onSubscribe(id int, fp *crypto.Digest, rec *Record) {
this.cmut.RLock()
client, ok := this.clients[fp.String()]
this.cmut.RUnlock()
if !ok {
return
}
client.lock.Lock()
this.Db.Exec("INSERT OR IGNORE INTO TopicFriend (friend_id, topic) VALUES (?, ?)",
client.friendId, rec.Key)
enable := (rec.Value[0] != 0)
this.Db.Exec("UPDATE TopicFriend SET requested = ?, acked_seqno = ? WHERE friend_id = ? AND topic = ?",
enable, rec.Priority, id, rec.Key)
client.wakeNotify.Broadcast()
client.lock.Unlock()
}
func (this *DataMgr) onMeta(topic string, key string, data []byte, fp string, isUp bool) {
var objHash *crypto.Digest
err := transfer.DecodeBytes(data, &objHash)
if err != nil {
this.Log.Printf("Unable to decode meta-data value")
return
}
objKey := objHash.String()
this.lock.Lock()
defer this.lock.Unlock()
obj := this.getObj(objKey)
if isUp {
obj.metaUp(topic)
} else {
obj.metaDown(topic)
}
this.writeObj(obj)
}
// Update the subscription state for a topic on a particular friend.
func (this *SyncMgr) Subscribe(id *crypto.Digest, topic string, enable bool) bool {
this.cmut.RLock()
client, ok := this.clients[id.String()]
this.cmut.RUnlock()
if !ok {
return false
}
client.lock.Lock()
this.Db.Exec("INSERT OR IGNORE INTO TopicFriend (friend_id, topic) VALUES (?, ?)",
client.friendId, topic)
this.Db.Exec("UPDATE TopicFriend SET desired = ? WHERE friend_id = ? AND topic = ?",
enable, client.friendId, topic)
row := this.Db.SingleQuery("SELECT heard_seqno FROM TopicFriend WHERE friend_id = ? AND topic = ?",
client.friendId, topic)
var heard int
this.Db.Scan(row, &heard)
enbyte := byte(0)
if enable {
enbyte = 1
}
myFp := this.Ident.Public().Fingerprint()
client.lock.Unlock()
this.Put(&Record{
RecordType: RTSubscribe,
Topic: crypto.HashOf(myFp, id).String(),
Key: topic,
Value: []byte{enbyte},
Priority: heard,
Author: "$",
})
return true
}
func (this *SyncMgr) onFriendChange(id int, fp *crypto.Digest, what link.FriendStatus) {
this.cmut.Lock()
if what == link.FriendStartup || what == link.FriendAdded {
this.Log.Printf("Adding friend: %s", fp.String())
myFp := this.Ident.Public().Fingerprint()
this.Db.Exec("INSERT OR IGNORE INTO TopicFriend (topic, friend_id, desired, requested) VALUES (?, ?, ?, ?)",
crypto.HashOf(fp, myFp).String(), id, 1, 1)
this.Db.Exec("INSERT OR IGNORE INTO TopicFriend (topic, friend_id, desired, requested) VALUES (?, ?, ?, ?)",
crypto.HashOf(myFp, fp).String(), id, 1, 1)
cl := newClientLooper(this, id)
this.clients[fp.String()] = cl
cl.run()
} else {
cl := this.clients[fp.String()]
cl.stop()
delete(this.clients, fp.String())
this.Db.Exec("DELETE INTO TopicFriend WHERE friend_id = ?", id)
}
this.cmut.Unlock()
}
func (this *ApiMgr) populateFriend(json *FriendJson, myFp, fp *crypto.Digest) {
json.Id = fp.String()
json.SelfCid = crypto.HashOf(fp, fp).String()
json.SendCid = crypto.HashOf(myFp, fp).String()
json.RecvCid = crypto.HashOf(fp, myFp).String()
}
func (this *TestNode) OnFriendChange(id int, fingerprint *crypto.Digest, what FriendStatus) {
this.Log.Printf("OnFriendChange(%d, %s, %d)", id, fingerprint.String(), what)
}