/** {@inheritDoc} */
@Nullable
@Override
public GridClientMessage decode(GridNioSession ses, ByteBuffer buf)
throws IOException, GridException {
ParserState state = ses.removeMeta(PARSER_STATE_META_NAME);
if (state == null) state = new ParserState();
PacketType type = state.packetType();
if (type == null) {
byte hdr = buf.get(buf.position());
switch (hdr) {
case MEMCACHE_REQ_FLAG:
state.packet(new GridTcpRestPacket());
state.packetType(PacketType.MEMCACHE);
break;
case GRIDGAIN_REQ_FLAG:
// Skip header.
buf.get();
state.packetType(PacketType.GRIDGAIN);
break;
default:
throw new IOException(
"Failed to parse incoming packet (invalid packet start) [ses="
+ ses
+ ", b="
+ Integer.toHexString(hdr & 0xFF)
+ ']');
}
}
GridClientMessage result = null;
switch (state.packetType()) {
case MEMCACHE:
result = parseMemcachePacket(ses, buf, state);
break;
case GRIDGAIN:
result = parseCustomPacket(ses, buf, state);
break;
}
if (result == null)
// Packet was not fully parsed yet.
ses.addMeta(PARSER_STATE_META_NAME, state);
return result;
}
/**
* Parses custom packet serialized by hessian marshaller.
*
* @param ses Session.
* @param buf Buffer containing not parsed bytes.
* @param state Parser state.
* @return Parsed message.
* @throws IOException If packet parsing or deserialization failed.
*/
@Nullable
private GridClientMessage parseCustomPacket(GridNioSession ses, ByteBuffer buf, ParserState state)
throws IOException {
assert state.packetType() == PacketType.GRIDGAIN;
assert state.packet() == null;
ByteArrayOutputStream tmp = state.buffer();
int len = state.index();
while (buf.remaining() > 0) {
byte b = buf.get();
if (len == 0) {
tmp.write(b);
if (tmp.size() == 4) {
len = U.bytesToInt(tmp.toByteArray(), 0);
tmp.reset();
if (len == 0) return PING_MESSAGE;
else if (len < 0)
throw new IOException(
"Failed to parse incoming packet (invalid packet length) [ses="
+ ses
+ ", len="
+ len
+ ']');
state.index(len);
}
} else {
tmp.write(b);
if (tmp.size() == len) return marshaller.unmarshal(tmp.toByteArray());
}
}
return null;
}
/**
* Parses memcache protocol message.
*
* @param ses Session.
* @param buf Buffer containing not parsed bytes.
* @param state Current parser state.
* @return Parsed packet.s
* @throws IOException If packet cannot be parsed.
* @throws GridException If deserialization error occurred.
*/
@Nullable
private GridClientMessage parseMemcachePacket(
GridNioSession ses, ByteBuffer buf, ParserState state) throws IOException, GridException {
assert state.packetType() == PacketType.MEMCACHE;
assert state.packet() != null;
assert state.packet() instanceof GridTcpRestPacket;
GridTcpRestPacket req = (GridTcpRestPacket) state.packet();
ByteArrayOutputStream tmp = state.buffer();
int i = state.index();
while (buf.remaining() > 0) {
byte b = buf.get();
if (i == 0) req.requestFlag(b);
else if (i == 1) req.operationCode(b);
else if (i == 2 || i == 3) {
tmp.write(b);
if (i == 3) {
req.keyLength(U.bytesToShort(tmp.toByteArray(), 0));
tmp.reset();
}
} else if (i == 4) req.extrasLength(b);
else if (i >= 8 && i <= 11) {
tmp.write(b);
if (i == 11) {
req.totalLength(U.bytesToInt(tmp.toByteArray(), 0));
tmp.reset();
}
} else if (i >= 12 && i <= 15) {
tmp.write(b);
if (i == 15) {
req.opaque(tmp.toByteArray());
tmp.reset();
}
} else if (i >= HDR_LEN && i < HDR_LEN + req.extrasLength()) {
tmp.write(b);
if (i == HDR_LEN + req.extrasLength() - 1) {
req.extras(tmp.toByteArray());
tmp.reset();
}
} else if (i >= HDR_LEN + req.extrasLength()
&& i < HDR_LEN + req.extrasLength() + req.keyLength()) {
tmp.write(b);
if (i == HDR_LEN + req.extrasLength() + req.keyLength() - 1) {
req.key(tmp.toByteArray());
tmp.reset();
}
} else if (i >= HDR_LEN + req.extrasLength() + req.keyLength()
&& i < HDR_LEN + req.totalLength()) {
tmp.write(b);
if (i == HDR_LEN + req.totalLength() - 1) {
req.value(tmp.toByteArray());
tmp.reset();
}
}
if (i == HDR_LEN + req.totalLength() - 1)
// Assembled the packet.
return assemble(ses, req);
i++;
}
state.index(i);
return null;
}