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 != null ? username : "")
.setNetReadTimeout(soTimeout)
.setNetWriteTimeout(soTimeout)
.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());
}
connected = true;
return new InetSocketAddress(channel.socket().getLocalAddress(), channel.socket().getLocalPort());
} catch (IOException e) {
throw new CanalClientException(e);
}
}