public void unsubscribe() throws CanalClientException {
waitClientRunning();
try {
writeWithHeader(
channel,
Packet.newBuilder()
.setType(PacketType.UNSUBSCRIPTION)
.setBody(
Unsub.newBuilder()
.setDestination(clientIdentity.getDestination())
.setClientId(String.valueOf(clientIdentity.getClientId()))
.build()
.toByteString())
.build()
.toByteArray());
//
Packet p = Packet.parseFrom(readNextPacket(channel));
Ack ack = Ack.parseFrom(p.getBody());
if (ack.getErrorCode() > 0) {
throw new CanalClientException(
"failed to unSubscribe with reason: " + ack.getErrorMessage());
}
} catch (IOException e) {
throw new CanalClientException(e);
}
}
private InetSocketAddress doConnect() throws CanalClientException {
try {
channel = SocketChannel.open();
channel.socket().setSoTimeout(soTimeout);
channel.connect(address);
Packet p = Packet.parseFrom(readNextPacket(channel));
if (p.getVersion() != 1) {
throw new CanalClientException("unsupported version at this client.");
}
if (p.getType() != PacketType.HANDSHAKE) {
throw new CanalClientException("expect handshake but found other type.");
}
//
Handshake handshake = Handshake.parseFrom(p.getBody());
supportedCompressions.addAll(handshake.getSupportedCompressionsList());
//
ClientAuth ca =
ClientAuth.newBuilder()
.setUsername(username)
.setNetReadTimeout(10000)
.setNetWriteTimeout(10000)
.build();
writeWithHeader(
channel,
Packet.newBuilder()
.setType(PacketType.CLIENTAUTHENTICATION)
.setBody(ca.toByteString())
.build()
.toByteArray());
//
Packet ack = Packet.parseFrom(readNextPacket(channel));
if (ack.getType() != PacketType.ACK) {
throw new CanalClientException("unexpected packet type when ack is expected");
}
Ack ackBody = Ack.parseFrom(ack.getBody());
if (ackBody.getErrorCode() > 0) {
throw new CanalClientException(
"something goes wrong when doing authentication: " + ackBody.getErrorMessage());
}
return new InetSocketAddress(
channel.socket().getLocalAddress(), channel.socket().getLocalPort());
} catch (IOException e) {
throw new CanalClientException(e);
}
}
public Message getWithoutAck(int batchSize) throws CanalClientException {
waitClientRunning();
try {
int size = (batchSize <= 0) ? 1000 : batchSize;
writeWithHeader(
channel,
Packet.newBuilder()
.setType(PacketType.GET)
.setBody(
Get.newBuilder()
.setDestination(clientIdentity.getDestination())
.setClientId(String.valueOf(clientIdentity.getClientId()))
.setFetchSize(size)
.build()
.toByteString())
.build()
.toByteArray());
//
Packet p = Packet.parseFrom(readNextPacket(channel));
switch (p.getType()) {
case MESSAGES:
{
if (!p.getCompression().equals(Compression.NONE)) {
throw new CanalClientException("compression is not supported in this connector");
}
Messages messages = Messages.parseFrom(p.getBody());
Message result = new Message(messages.getBatchId());
for (ByteString byteString : messages.getMessagesList()) {
result.addEntry(Entry.parseFrom(byteString));
}
return result;
}
case ACK:
{
Ack ack = Ack.parseFrom(p.getBody());
throw new CanalClientException(
"something goes wrong with reason: " + ack.getErrorMessage());
}
default:
{
throw new CanalClientException("unexpected packet type: " + p.getType());
}
}
} catch (IOException e) {
throw new CanalClientException(e);
}
}
public void rollback(long batchId) throws CanalClientException {
waitClientRunning();
ClientRollback ca =
ClientRollback.newBuilder()
.setDestination(clientIdentity.getDestination())
.setClientId(String.valueOf(clientIdentity.getClientId()))
.setBatchId(batchId)
.build();
try {
writeWithHeader(
channel,
Packet.newBuilder()
.setType(PacketType.CLIENTROLLBACK)
.setBody(ca.toByteString())
.build()
.toByteArray());
} catch (IOException e) {
throw new CanalClientException(e);
}
}