/**
* Called when the connection terminates. Notifies the {@link StoredServerChannel} object that we
* can attempt to resume this channel in the future and stops generating messages for the client.
*
* <p>Note that this <b>MUST</b> still be called even after either {@link
* ServerConnection#destroyConnection(CloseReason)} or {@link PaymentChannelServer#close()} is
* called to actually handle the connection close logic.
*/
public void connectionClosed() {
lock.lock();
try {
log.info("Server channel closed.");
connectionOpen = false;
try {
if (state != null && state.getMultisigContract() != null) {
StoredPaymentChannelServerStates channels =
(StoredPaymentChannelServerStates)
wallet.getExtensions().get(StoredPaymentChannelServerStates.EXTENSION_ID);
if (channels != null) {
StoredServerChannel storedServerChannel =
channels.getChannel(state.getMultisigContract().getHash());
if (storedServerChannel != null) {
storedServerChannel.clearConnectedHandler();
}
}
}
} catch (IllegalStateException e) {
// Expected when we call getMultisigContract() sometimes
}
} finally {
lock.unlock();
}
}
@GuardedBy("lock")
private void receiveVersionMessage(Protos.TwoWayChannelMessage msg) throws VerificationException {
checkState(step == InitStep.WAITING_ON_CLIENT_VERSION && msg.hasClientVersion());
final Protos.ClientVersion clientVersion = msg.getClientVersion();
final int major = clientVersion.getMajor();
if (major != SERVER_MAJOR_VERSION) {
error(
"This server needs protocol version "
+ SERVER_MAJOR_VERSION
+ " , client offered "
+ major,
Protos.Error.ErrorCode.NO_ACCEPTABLE_VERSION,
CloseReason.NO_ACCEPTABLE_VERSION);
return;
}
Protos.ServerVersion.Builder versionNegotiationBuilder =
Protos.ServerVersion.newBuilder()
.setMajor(SERVER_MAJOR_VERSION)
.setMinor(SERVER_MINOR_VERSION);
conn.sendToClient(
Protos.TwoWayChannelMessage.newBuilder()
.setType(Protos.TwoWayChannelMessage.MessageType.SERVER_VERSION)
.setServerVersion(versionNegotiationBuilder)
.build());
ByteString reopenChannelContractHash = clientVersion.getPreviousChannelContractHash();
if (reopenChannelContractHash != null && reopenChannelContractHash.size() == 32) {
Sha256Hash contractHash = new Sha256Hash(reopenChannelContractHash.toByteArray());
log.info("New client that wants to resume {}", contractHash);
StoredPaymentChannelServerStates channels =
(StoredPaymentChannelServerStates)
wallet.getExtensions().get(StoredPaymentChannelServerStates.EXTENSION_ID);
if (channels != null) {
StoredServerChannel storedServerChannel = channels.getChannel(contractHash);
if (storedServerChannel != null) {
final PaymentChannelServer existingHandler =
storedServerChannel.setConnectedHandler(this, false);
if (existingHandler != this) {
log.warn(" ... and that channel is already in use, disconnecting other user.");
existingHandler.close();
storedServerChannel.setConnectedHandler(this, true);
}
log.info("Got resume version message, responding with VERSIONS and CHANNEL_OPEN");
state = storedServerChannel.getOrCreateState(wallet, broadcaster);
step = InitStep.CHANNEL_OPEN;
conn.sendToClient(
Protos.TwoWayChannelMessage.newBuilder()
.setType(Protos.TwoWayChannelMessage.MessageType.CHANNEL_OPEN)
.build());
conn.channelOpen(contractHash);
return;
} else {
log.error(" ... but we do not have any record of that contract! Resume failed.");
}
} else {
log.error(" ... but we do not have any stored channels! Resume failed.");
}
}
log.info(
"Got initial version message, responding with VERSIONS and INITIATE: min value={}",
minAcceptedChannelSize.value);
myKey = new ECKey();
wallet.freshReceiveKey();
expireTime = Utils.currentTimeSeconds() + truncateTimeWindow(clientVersion.getTimeWindowSecs());
step = InitStep.WAITING_ON_UNSIGNED_REFUND;
Protos.Initiate.Builder initiateBuilder =
Protos.Initiate.newBuilder()
.setMultisigKey(ByteString.copyFrom(myKey.getPubKey()))
.setExpireTimeSecs(expireTime)
.setMinAcceptedChannelSize(minAcceptedChannelSize.value)
.setMinPayment(Transaction.REFERENCE_DEFAULT_MIN_TX_FEE.value);
conn.sendToClient(
Protos.TwoWayChannelMessage.newBuilder()
.setInitiate(initiateBuilder)
.setType(Protos.TwoWayChannelMessage.MessageType.INITIATE)
.build());
}