func (as *AgentServer) handleLocalReadConnection(conn net.Conn, name string, offset int64) {
dsStore := as.storageBackend.WaitForNamedDatasetShard(name)
// println(name, "start reading from:", offset)
buf := make([]byte, 4)
// loop for every read
for {
_, err := dsStore.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 = dsStore.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
}
}
}
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
}
}
}
