func (p *TFramedTransport) Flush() error {
size := p.writeBuffer.Len()
buf := []byte{0, 0, 0, 0}
binary.BigEndian.PutUint32(buf, uint32(size))
_, err := p.transport.Write(buf)
if err != nil {
return thrift.NewTTransportExceptionFromOsError(err)
}
if size > 0 {
n, err := p.writeBuffer.WriteTo(p.transport)
if err != nil {
println("Error while flushing write buffer of size ", size, " to transport, only wrote ", n, " bytes: ", err.Error())
return thrift.NewTTransportExceptionFromOsError(err)
}
}
err = p.transport.Flush()
return thrift.NewTTransportExceptionFromOsError(err)
}
func (p *TFramedTransport) Read(buf []byte) (int, error) {
if p.readBuffer.Len() > 0 {
got, err := p.readBuffer.Read(buf)
if got > 0 {
return got, thrift.NewTTransportExceptionFromOsError(err)
}
}
// Read another frame of data
f, e := p.readFrame()
if e != nil {
return f, e
}
if f == 0 { // no more to read right now
return 0, nil
}
got, err := p.readBuffer.Read(buf)
return got, thrift.NewTTransportExceptionFromOsError(err)
}
func (ce *CassandraCommand) doExecute(outConn Connection, timeout time.Duration) (outPackets <-chan *CommandPacket) {
inCh := make(chan *CommandPacket)
go func() {
defer close(inCh)
log.Print("CassandraCommand:Execute executing ", ce.name)
// get transport and protocol for the inbound connection
inTrans := NewCommandPacketTTransport(inCh)
inProt := ce.protocolFactory.GetProtocol(inTrans)
// get transport and protocol for the upstream connection
outTrans := outConn.Transport()
outProt := outConn.ProtocolFactory().GetProtocol(outTrans)
// write our inbound command header to the upstream connection
headProtExc := outProt.WriteMessageBegin(ce.name, ce.typeId, ce.seqId)
// respond to errors from writing the command header
if headProtExc != nil {
// headProtExc is a thrift.TTException
log.Print("CassandraCommand:Execute error sending header to upsteram server: ", headProtExc)
ce.writeError(inProt, headProtExc)
return
}
if ce.argsProc != nil && ce.argsProc.GotArgs() {
// if we already read the args and processed it, write the processed args to the upstream server
writeExc := ce.writeArgsMessage(outProt)
outProt.WriteMessageEnd()
if writeExc != nil {
log.Print("CassandraCommand:Execute error writing processed args: ", writeExc)
ce.writeError(inProt, writeExc)
return
}
} else {
// otherwise just write all inbound packets to the upstream server
for pkt := range ce.inPackets {
if pkt.Error() != nil {
// if we got an error, then bail
log.Print("CassandraCommand:Execute error reading data from client: ", pkt.Error())
ce.writeError(inProt, thrift.NewTProtocolExceptionFromOsError(pkt.Error()))
return
}
// pass on our inbound input to the upstream server
wnWritten, wErr := outTrans.Write(pkt.Bytes())
if wErr != nil {
log.Print("CassandraCommand:Execute error writing ", wnWritten, " bytes to upstream server: ", wErr)
ce.writeError(inProt, thrift.NewTTransportExceptionFromOsError(wErr))
return
}
}
}
outTrans.Flush() // get rid of the command
// start reading a connection, block until it's ready
oName, oTypId, oSeqId, oErr := outProt.ReadMessageBegin()
// respond to errors from reading the command header
if oErr != nil {
log.Print("CassandraCommand:Execute error reading response header from upstream server: ", oErr)
ce.writeError(inProt, oErr)
return
}
// write our header received from the upstream to the inbound connection
iErr := inProt.WriteMessageBegin(oName, oTypId, oSeqId)
if iErr != nil {
// received an error writing response header, try and send an error
log.Print("CassandraCommand:Execute error writing response header to client: ", iErr)
ce.writeError(inProt, iErr)
return
}
// read all data from the upstream server, streaming them to the inbound connection
// note: at this point we kind of have our asses hanging out: we can not successfully send error header should we encounter
// an error reading, as we've already written the header. we'll still send an error just in case
for pkt := range TTransportReadGen(outTrans, "upstreamResp") {
if pkt.Error() != nil {
log.Print("CassandraCommand:Execute error writing response data to client: ", pkt.Error())
ce.writeError(inProt, thrift.NewTProtocolExceptionFromOsError(pkt.Error()))
return
}
_, writeErr := inProt.Transport().Write(pkt.Bytes()) // this will ultimately translate into inCh <-pkt
if writeErr != nil {
log.Print("CassandraCommand:Execute error writing back to client protocol: ", writeErr)
}
}
}()
return inCh
}
func (p *TFramedTransport) Write(buf []byte) (int, error) {
n, err := p.writeBuffer.Write(buf)
return n, thrift.NewTTransportExceptionFromOsError(err)
}