func (rc *ReceiveChannel) receiveTopicFrom(target string) {
// connect to a TCP server
network := "tcp"
raddr, err := net.ResolveTCPAddr(network, target)
if err != nil {
log.Printf("Fail to resolve %s:%v", target, err)
return
}
// println("dial tcp", raddr.String())
conn, err := net.DialTCP(network, nil, raddr)
if err != nil {
log.Printf("Fail to dial %s:%v", raddr, err)
time.Sleep(time.Second)
return
}
defer conn.Close()
buf := make([]byte, 4)
util.WriteBytes(conn, buf, util.NewMessage(util.Data, []byte("GET "+rc.name)))
util.WriteUint64(conn, rc.offset)
util.WriteBytes(conn, buf, util.NewMessage(util.Data, []byte("ok")))
ticker := time.NewTicker(time.Millisecond * 1100)
defer ticker.Stop()
go func() {
buf := make([]byte, 4)
for range ticker.C {
util.WriteBytes(conn, buf, util.NewMessage(util.Data, []byte("ok")))
// print(".")
}
}()
for {
f, data, err := util.ReadBytes(conn, buf)
if err == io.EOF {
// print("recieve close chan2: eof")
break
}
if err != nil {
log.Printf("receive error:%v", err)
continue
}
rc.offset += 4 + 1
if f != util.Data {
// print("recieve close chan1: ", string([]byte{byte(f)}))
break
}
// println("receive raw data :", string(data.Bytes()))
rc.offset += uint64(len(data.Data()))
rc.Ch <- data.Data()
}
close(rc.Ch)
}
func (rc *ReceiveChannel) receiveTopicFrom(target string) {
readWriter, err := util.Dial(rc.tlsConfig, target)
if err != nil {
log.Printf("Fail to dial receive %s: %v", target, err)
return
}
defer readWriter.Close()
// println("receiving", rc.name, "from", target)
buf := make([]byte, 4)
util.WriteBytes(readWriter, buf, util.NewMessage(util.Data, []byte("GET "+rc.name)))
util.WriteUint64(readWriter, rc.offset)
util.WriteBytes(readWriter, buf, util.NewMessage(util.Data, []byte("ok")))
ticker := time.NewTicker(time.Millisecond * 1100)
defer ticker.Stop()
go func() {
buf := make([]byte, 4)
for range ticker.C {
util.WriteBytes(readWriter, buf, util.NewMessage(util.Data, []byte("ok")))
// print(".")
}
}()
for {
f, data, err := util.ReadBytes(readWriter, buf)
if err == io.EOF {
// print("recieve close chan2: eof")
break
}
if err != nil {
log.Printf("receive error:%v", err)
continue
}
rc.offset += 4 + 1
if f != util.Data {
// print("recieve close chan1: ", string([]byte{byte(f)}))
break
}
// println("receive raw data :", string(data.Bytes()))
rc.offset += uint64(len(data.Data()))
rc.Ch <- data.Data()
}
close(rc.Ch)
}
// Handles incoming requests.
func (r *AgentServer) handleRequest(conn net.Conn) {
buf := make([]byte, 4)
f, message, err := util.ReadBytes(conn, buf)
tlscon, ok := conn.(*tls.Conn)
if ok {
state := tlscon.ConnectionState()
if !state.HandshakeComplete {
log.Printf("Failed to tls handshake with: %+v", tlscon.RemoteAddr())
return
}
}
if f != util.Data {
//strange if this happens
println("read", len(message.Bytes()), "request flag:", f, "data", string(message.Data()))
return
}
if err != nil {
log.Printf("Failed to read command %s:%v", string(message.Data()), err)
}
if bytes.HasPrefix(message.Data(), []byte("PUT ")) {
name := string(message.Data()[4:])
r.handleLocalWriteConnection(conn, name)
} else if bytes.HasPrefix(message.Data(), []byte("GET ")) {
name := string(message.Data()[4:])
offset := util.ReadUint64(conn)
r.handleReadConnection(conn, name, int64(offset))
} else if bytes.HasPrefix(message.Data(), []byte("CMD ")) {
newCmd := &cmd.ControlMessage{}
err := proto.Unmarshal(message.Data()[4:], newCmd)
if err != nil {
log.Fatal("unmarshaling error: ", err)
}
reply := r.handleCommandConnection(conn, newCmd)
if reply != nil {
data, err := proto.Marshal(reply)
if err != nil {
log.Fatal("marshaling error: ", err)
}
conn.Write(data)
}
}
}
func (as *AgentServer) handleWriteConnection(r io.Reader, name string) {
as.name2StoreCond.L.Lock()
ds, ok := as.name2Store[name]
if ok {
as.doDelete(name)
}
s, err := store.NewLocalFileDataStore(as.dir, fmt.Sprintf("%s-%d", name, as.Port))
if err != nil {
log.Printf("Failed to create a queue on disk: %v", err)
as.name2StoreCond.L.Unlock()
return
}
as.name2Store[name] = NewLiveDataStore(s)
ds = as.name2Store[name]
// println(name, "is broadcasting...")
as.name2StoreCond.Broadcast()
as.name2StoreCond.L.Unlock()
//register stream
go client.NewHeartBeater(as.Port, *as.Option.Master).StartChannelHeartBeat(ds.killHeartBeater, name)
// println(name, "start writing.")
buf := make([]byte, 4)
for {
_, message, err := util.ReadBytes(r, buf)
if err == io.EOF {
// println("agent recv eof:", string(message.Bytes()))
break
}
if err == nil {
util.WriteBytes(ds.store, buf, message)
// println("agent recv:", string(message.Bytes()))
}
if message.Flag() != util.Data {
// println("finished writing", name)
break
}
}
}
func (as *AgentServer) handleLocalWriteConnection(r io.Reader, name string) {
dsStore := as.storageBackend.CreateNamedDatasetShard(name)
// println(name, "start writing.")
buf := make([]byte, 4)
for {
_, message, err := util.ReadBytes(r, buf)
if err == io.EOF {
// println("agent recv eof:", string(message.Bytes()))
break
}
if err == nil {
util.WriteBytes(dsStore, buf, message)
// println("agent recv:", string(message.Bytes()))
}
if message.Flag() != util.Data {
// println("finished writing", name)
break
}
}
}
func (as *AgentServer) handleLocalReadConnection(conn net.Conn, name string, offset int64) {
var ds *LiveDataStore
var ok bool
as.name2StoreCond.L.Lock()
for {
ds, ok = as.name2Store[name]
if ok {
break
}
println(name, "is waiting to read...")
as.name2StoreCond.Wait()
}
as.name2StoreCond.L.Unlock()
// println(name, "start reading from:", offset)
closeSignal := make(chan bool, 1)
go func() {
buf := make([]byte, 4)
for false {
// println("wait for reader heartbeat")
conn.SetReadDeadline(time.Now().Add(2500 * time.Millisecond))
_, _, err := util.ReadBytes(conn, buf)
if err != nil {
fmt.Printf("connection is closed? (%v)\n", err)
closeSignal <- true
close(closeSignal)
return
}
}
}()
buf := make([]byte, 4)
// loop for every read
for {
_, err := ds.store.ReadAt(buf, offset)
if err != nil {
// connection is closed
if err != io.EOF {
log.Printf("Read size from %s offset %d: %v", name, offset, err)
}
// println("got problem reading", name, offset, err.Error())
return
}
offset += 4
size := util.BytesToUint32(buf)
// println("reading", name, offset, "size:", size)
messageBytes := make([]byte, size)
_, err = ds.store.ReadAt(messageBytes, offset)
if err != nil {
// connection is closed
if err != io.EOF {
log.Printf("Read data from %s offset %d: %v", name, offset, err)
}
return
}
offset += int64(size)
m := util.LoadMessage(messageBytes)
util.WriteBytes(conn, buf, m)
if m.Flag() != util.Data {
// println("Finished reading", name)
break
}
}
}