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Efficient, scalable, and flexible Java implementation of the Short Messaging Peer to Peer Protocol (SMPP)
package com.cloudhopper.smpp.transcoder;
/*
* #%L
* ch-smpp
* %%
* Copyright (C) 2009 - 2015 Cloudhopper by Twitter
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import com.cloudhopper.smpp.type.UnrecoverablePduException;
import com.cloudhopper.smpp.type.UnknownCommandIdException;
import com.cloudhopper.smpp.type.RecoverablePduException;
import com.cloudhopper.commons.util.HexUtil;
import com.cloudhopper.smpp.SmppConstants;
import com.cloudhopper.smpp.pdu.BindReceiver;
import com.cloudhopper.smpp.pdu.BindReceiverResp;
import com.cloudhopper.smpp.pdu.BindTransceiver;
import com.cloudhopper.smpp.pdu.BindTransceiverResp;
import com.cloudhopper.smpp.pdu.BindTransmitter;
import com.cloudhopper.smpp.pdu.BindTransmitterResp;
import com.cloudhopper.smpp.pdu.CancelSm;
import com.cloudhopper.smpp.pdu.CancelSmResp;
import com.cloudhopper.smpp.pdu.DataSm;
import com.cloudhopper.smpp.pdu.DataSmResp;
import com.cloudhopper.smpp.pdu.DeliverSm;
import com.cloudhopper.smpp.pdu.DeliverSmResp;
import com.cloudhopper.smpp.pdu.EnquireLink;
import com.cloudhopper.smpp.pdu.EnquireLinkResp;
import com.cloudhopper.smpp.pdu.GenericNack;
import com.cloudhopper.smpp.pdu.PartialPdu;
import com.cloudhopper.smpp.pdu.PartialPduResp;
import com.cloudhopper.smpp.pdu.Pdu;
import com.cloudhopper.smpp.pdu.PduResponse;
import com.cloudhopper.smpp.pdu.QuerySm;
import com.cloudhopper.smpp.pdu.QuerySmResp;
import com.cloudhopper.smpp.pdu.SubmitSm;
import com.cloudhopper.smpp.pdu.SubmitSmResp;
import com.cloudhopper.smpp.pdu.Unbind;
import com.cloudhopper.smpp.pdu.UnbindResp;
import com.cloudhopper.smpp.type.NotEnoughDataInBufferException;
import com.cloudhopper.smpp.util.PduUtil;
import com.cloudhopper.smpp.util.SequenceNumber;
import org.jboss.netty.buffer.BigEndianHeapChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffer;
/**
*
* @author joelauer (twitter: @jjlauer or http://twitter.com/jjlauer)
*/
public class DefaultPduTranscoder implements PduTranscoder {
private final PduTranscoderContext context;
public DefaultPduTranscoder(PduTranscoderContext context) {
this.context = context;
}
@Override
public ChannelBuffer encode(Pdu pdu) throws UnrecoverablePduException, RecoverablePduException {
// see if we can map the command status into a message
if (pdu instanceof PduResponse) {
PduResponse response = (PduResponse)pdu;
if (response.getResultMessage() == null) {
response.setResultMessage(context.lookupResultMessage(pdu.getCommandStatus()));
}
}
// if the pdu length hasn't been assigned yet, calculate it now
// NOTE: it may be safest to recalculate it, but we won't since the SmppSession
// should really be the only interface creating PDUs
if (!pdu.hasCommandLengthCalculated()) {
pdu.calculateAndSetCommandLength();
}
// create the buffer and add the header
ChannelBuffer buffer = new BigEndianHeapChannelBuffer(pdu.getCommandLength());
buffer.writeInt(pdu.getCommandLength());
buffer.writeInt(pdu.getCommandId());
buffer.writeInt(pdu.getCommandStatus());
buffer.writeInt(pdu.getSequenceNumber());
// add mandatory body (a noop if no body exists)
pdu.writeBody(buffer);
// add optional parameters (a noop if none exist)
pdu.writeOptionalParameters(buffer, context);
// NOTE: at this point, the entire buffer written MUST match the command length
// from earlier -- if it doesn't match, the our encoding process went awry
if (buffer.readableBytes() != pdu.getCommandLength()) {
throw new NotEnoughDataInBufferException("During PDU encoding the expected commandLength did not match the actual encoded (a serious error with our own encoding process)", pdu.getCommandLength(), buffer.readableBytes());
}
return buffer;
}
@Override
public Pdu decode(ChannelBuffer buffer) throws UnrecoverablePduException, RecoverablePduException {
// wait until the length prefix is available
if (buffer.readableBytes() < SmppConstants.PDU_INT_LENGTH) {
return null;
}
// parse the command length (first 4 bytes)
int commandLength = buffer.getInt(buffer.readerIndex());
//logger.trace("PDU commandLength [" + commandLength + "]");
// valid command length is >= 16 bytes
if (commandLength < SmppConstants.PDU_HEADER_LENGTH) {
throw new UnrecoverablePduException("Invalid PDU length [0x" + HexUtil.toHexString(commandLength) + "] parsed");
}
// wait until the whole pdu is available (entire pdu)
if (buffer.readableBytes() < commandLength) {
return null;
}
// at this point, we have the entire PDU and length already in the buffer
// we'll create a new "view" of this PDU and read the data from the actual buffer
// NOTE: this should be super fast since the underlying byte array doesn't get copied
ChannelBuffer buffer0 = buffer.readSlice(commandLength);
return doDecode(commandLength, buffer0);
}
protected Pdu doDecode(int commandLength, ChannelBuffer buffer) throws UnrecoverablePduException, RecoverablePduException {
// skip the length field because we already parsed it
buffer.skipBytes(SmppConstants.PDU_INT_LENGTH);
// read the remaining portion of the PDU header
int commandId = buffer.readInt();
int commandStatus = buffer.readInt();
int sequenceNumber = buffer.readInt();
// this is a major issue if the sequence number is invalid
SequenceNumber.assertValid(sequenceNumber);
Pdu pdu = null;
// any command id with its 31st bit set to true is a response
if (PduUtil.isRequestCommandId(commandId)) {
if (commandId == SmppConstants.CMD_ID_ENQUIRE_LINK) {
pdu = new EnquireLink();
} else if (commandId == SmppConstants.CMD_ID_DELIVER_SM) {
pdu = new DeliverSm();
} else if (commandId == SmppConstants.CMD_ID_SUBMIT_SM) {
pdu = new SubmitSm();
} else if (commandId == SmppConstants.CMD_ID_DATA_SM) {
pdu = new DataSm();
} else if (commandId == SmppConstants.CMD_ID_CANCEL_SM) {
pdu = new CancelSm();
} else if (commandId == SmppConstants.CMD_ID_QUERY_SM) {
pdu = new QuerySm();
} else if (commandId == SmppConstants.CMD_ID_BIND_TRANSCEIVER) {
pdu = new BindTransceiver();
} else if (commandId == SmppConstants.CMD_ID_BIND_TRANSMITTER) {
pdu = new BindTransmitter();
} else if (commandId == SmppConstants.CMD_ID_BIND_RECEIVER) {
pdu = new BindReceiver();
} else if (commandId == SmppConstants.CMD_ID_UNBIND) {
pdu = new Unbind();
} else {
pdu = new PartialPdu(commandId);
}
} else {
if (commandId == SmppConstants.CMD_ID_SUBMIT_SM_RESP) {
pdu = new SubmitSmResp();
} else if (commandId == SmppConstants.CMD_ID_DELIVER_SM_RESP) {
pdu = new DeliverSmResp();
} else if (commandId == SmppConstants.CMD_ID_DATA_SM_RESP) {
pdu = new DataSmResp();
} else if (commandId == SmppConstants.CMD_ID_CANCEL_SM_RESP) {
pdu = new CancelSmResp();
} else if (commandId == SmppConstants.CMD_ID_QUERY_SM_RESP) {
pdu = new QuerySmResp();
} else if (commandId == SmppConstants.CMD_ID_ENQUIRE_LINK_RESP) {
pdu = new EnquireLinkResp();
} else if (commandId == SmppConstants.CMD_ID_BIND_TRANSCEIVER_RESP) {
pdu = new BindTransceiverResp();
} else if (commandId == SmppConstants.CMD_ID_BIND_RECEIVER_RESP) {
pdu = new BindReceiverResp();
} else if (commandId == SmppConstants.CMD_ID_BIND_TRANSMITTER_RESP) {
pdu = new BindTransmitterResp();
} else if (commandId == SmppConstants.CMD_ID_UNBIND_RESP) {
pdu = new UnbindResp();
} else if (commandId == SmppConstants.CMD_ID_GENERIC_NACK) {
pdu = new GenericNack();
} else {
pdu = new PartialPduResp(commandId);
}
}
// set pdu header values
pdu.setCommandLength(commandLength);
pdu.setCommandStatus(commandStatus);
pdu.setSequenceNumber(sequenceNumber);
// check if we need to throw an exception
if (pdu instanceof PartialPdu) {
throw new UnknownCommandIdException(pdu, "Unsupported or unknown PDU request commandId [0x" + HexUtil.toHexString(commandId) + "]");
} else if (pdu instanceof PartialPduResp) {
throw new UnknownCommandIdException(pdu, "Unsupported or unknown PDU response commandId [0x" + HexUtil.toHexString(commandId) + "]");
}
// see if we can map the command status into a message
if (pdu instanceof PduResponse) {
PduResponse response = (PduResponse)pdu;
response.setResultMessage(context.lookupResultMessage(commandStatus));
}
try {
// parse pdu body parameters (may throw exception)
pdu.readBody(buffer);
// parse pdu optional parameters (may throw exception)
pdu.readOptionalParameters(buffer, context);
} catch (RecoverablePduException e) {
// check if we should add the partial pdu to the exception
if (e.getPartialPdu() == null) {
e.setPartialPdu(pdu);
}
// rethrow it
throw e;
}
return pdu;
}
}